JPH06246499A - Method and device for setting press work condition of press - Google Patents

Abstract

PURPOSE:To immediately reproduce an appropriate press-work condition in the case of using the same die again by the same press. CONSTITUTION:When setting a relative distance h corresponding to a die height in the case of the first die, the relative distance h is adjusted so that a prescribed press load Fpoi is attained while performing a trial pressing at R2. After the adjustment, the relative distance h is stored at R5 as a relative distance h* data. Next, in the case of using the die by the same press, an adjustment is made at R8 so that the relative distance h coincides with the h* data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press machine, and more particularly to a method and apparatus for setting press working conditions according to a die used.

[0002]

2. Description of the Related Art Conventionally, a press machine has been widely used which presses a pair of removably mounted dies close to and away from each other. One type of such a press machine depends on the dies used. There are some that can adjust the press working conditions. For example, FIG. 2 and FIG. 3 show an example of a single action type press machine for performing drawing work, in which wrinkle holding ring 30 is used for wrinkle holding while drawing is performed by die die 18 and punch die 12. Air cylinder 42 that affects the load
The press working conditions such as the air pressure Pa and the relative distance h (corresponding to the die height) that affects the press load can be changed by the ON / OFF supply / exhaust valve 46, the servo motor 60, and the like. The wrinkle retainer load and the press load for performing appropriate press working differ depending on the individual molds, and the weights of the wrinkle retainer ring 30 and the die mold 18 that compose the mold differ from mold to mold. Therefore, it is necessary to adjust the air pressure Pa, the relative distance h, etc. for each die used, and the trial press is performed in advance while trial and error are performed so that desired press working is performed. Is normal.

On the other hand, the applicant of the present application, in Japanese Patent Application No. 4-114004 filed earlier, based on the die information peculiar to the die and the machine information peculiar to the press machine, the press working conditions such as the air pressure Pa. We have proposed a press processing condition setting device that automatically sets. For example, the air pressure Pa will be specifically described. The wrinkle pressing load Fso and the wrinkle pressing ring 3 that can perform an appropriate drawing process.
The weight Wr of 0 and the number n of the cushion pins 24 to be used are obtained in advance for each mold by a tri-press (press machine performing trial punching at the time of manufacturing the mold) or the like, and the cushion pad 28 is used.
Weight Wa, weight Wp of the cushion pin 24, and pressure receiving area Aa of the air cylinder 42, the air pressure Pax is calculated according to the following equation (1) so that the air pressure Pa in the air tank 44 becomes the air pressure Pax. The ON / OFF supply / exhaust valve 46 is controlled to be switched to ON.

[Formula 1] Pax = (Fso + Wa + Wr + n · Wp) / Aa (1)

[0004]

However, in a press machine that performs a plurality of types of press working while exchanging dies, even if the same die is used again, the press working conditions can be determined based on the above die information. There is a problem in that the operating rate of the press machine is not necessarily good, for example, when the die height h is set, several trial runs are required each time.

The present invention has been made in view of the above circumstances, and an object thereof is to make it possible to immediately reproduce the previous press working conditions when the same die is used in the same press machine. Especially.

[0006]

[Means for Solving the Problem] In order to achieve such an object, the set press working conditions may be stored. The first invention is a pair of removably mounted members. A method of setting the press working conditions according to the mold to be used in a press machine capable of adjusting the press working conditions that affect the press working while performing the press working with the molds approaching and separating from each other, (A) an adjusting step of adjusting the press working conditions so as to obtain an appropriate pressed product, and (b) the press working conditions adjusted in the adjusting process, in relation to the press machine and the mold. Having a storing step of storing in the storing means, and (c) a reproducing step of reproducing the press working condition stored in the storing means when the same die is arranged in the same press machine. And it features.

[0007]

[Operations and Effects of the First Invention] That is, in the case of the first die, the press working conditions are adjusted so that an appropriate pressed product can be obtained in the adjusting process, and the adjusted press working conditions are the press working conditions. It is stored in the storage means in relation to the machine and the mold. In the adjustment process, it is possible to adjust the press working conditions so that an appropriate pressed product can be obtained by trial and error, but based on the mold information predetermined for each mold so that an appropriate pressed product can be obtained. To make adjustments while checking the machine characteristics unique to the press machine, or to obtain the machine information unique to the press machine necessary to set the press processing conditions in advance and make adjustments based on that machine information and die information. You may. Further, when the storage means is attached to the press machine, it is sufficient to store the type of the die and the press working conditions in a pair, and when the storage means is attached to the die, the press It suffices to store the machine type and the press processing condition in pairs. If the storage means is not attached to any of them, the combination is stored with the combination of the mold type, the press machine type and the press processing condition. You should keep it. Then, when the mold is used again in the same press machine, the press working condition stored in the storage means is immediately reproduced without performing the adjustment in the adjusting step.

Therefore, when the same die is used again in a press machine for performing a plurality of types of press working while exchanging the die, it is not necessary to adjust the press working conditions one by one, and an appropriate press working condition is immediately obtained. As a result, the load on the operator is reduced and the operating rate of the press machine is improved.

[0009]

In order to achieve the above-mentioned object, a second invention is to separate a pair of removably attached molds from each other, as shown in the claim correspondence diagram of FIG. In a press machine capable of performing press working with a press machine and adjusting a press working condition that affects the press working, a device for setting the press working condition according to a die to be used, which is (a) an appropriate press product Input means for inputting predetermined die information for each die so as to obtain, and (b) based on the die information input by the input means, so as to obtain an appropriate pressed product, Adjusting means for adjusting press working conditions, and (c) storage means for storing the press working conditions adjusted by the adjusting means in relation to the press machine and the mold.
(D) When the same die is placed on the same press machine,
Reproducing means for reproducing the pressing conditions stored in the storage means.

[0010]

That is, the second aspect of the present invention relates to a press working condition setting apparatus that preferably implements the first aspect of the present invention. In the case of the first die, the die input by the input means is used. Based on the mold information, the adjusting means adjusts the press working conditions so as to obtain an appropriate pressed product, and the adjusted press working conditions are stored in the storage means in relation to the press machine and the mold. The adjusting means can be configured to adjust the press working conditions by using the machine information of the press machine and the die information stored in advance, but the die information can be obtained while checking the machine characteristics peculiar to the press machine. The press working conditions may be adjusted based on the above. Further, when the storage means is attached to the press machine, it is sufficient to store the type of the die and the press working conditions in a pair, and when the storage means is attached to the die, the press It suffices to store the machine type and the press processing condition in pairs. If the storage means is not attached to any of them, the combination is stored with the combination of the mold type, the press machine type and the press processing condition. You should keep it. Then, when the mold is used again in the same press machine, the press working condition stored in the storage means is immediately reproduced by the reproducing means without performing the adjustment by the adjusting means.

Therefore, in a press machine that performs a plurality of types of press working while exchanging the dies, when the same die is used again, the proper press working conditions can be immediately reproduced, and The operating rate is improved. Further, in the second invention, the first press working condition is automatically adjusted based on the die information, so that the burden on the operator is reduced as compared with the conventional case of performing the trial and error adjustment. Significantly reduced and stable pressed products of excellent quality can be obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 2 shows an example of a single action type press machine 10 for drawing an automobile outer panel or the like. A bolster 14 to which a punch type 12 is attached is fixedly mounted on a base (not shown) via a bed 16. On the other hand, the slide plate 20 to which the die mold 18 is attached is vertically moved by four plungers 22. The bolster 14 has
A large number of through holes 26 are provided to dispose the cushion pins 24.
Below the bolster 14, a cushion pad 28 that supports the cushion pins 24 is disposed. The cushion pin 24 supports the wrinkle pressing ring 30 arranged together with the punch die 12, and is arranged in an arbitrary number at a predetermined position according to the shape of the wrinkle pressing ring 30. It The punch die 12, the wrinkle retainer ring 30, and the die die 18
Corresponds to a pair of dies that are detachably attached to the press machine 10 and are used. The punch die 12 and the die die 18 are held while the peripheral edge portion of the press material is wrinkled by the die die 18 and the wrinkle holding ring 30. The drawing process is performed by.

The cushion pad 28 has a large number of hydraulic cylinders 32 corresponding to the through holes 26.
The lower ends of the cushion pins 24 are brought into contact with the pistons of the hydraulic cylinders 32.
The cushion pad 28 can be moved in the vertical direction while being guided by the guide 40, and is always urged upward by the air cylinder 42.
The pressure chamber of the air cylinder 42 is communicated with an air tank 44, and the air tank 44 is an electromagnetic O type.
The ON / OFF supply / exhaust valve 4 is connected to the pressure air source 48 in the factory via the N, OFF supply / exhaust valve 46.
The air pressure Pa in the pressure chamber or in the air tank 44 is adjusted by controlling the switching of 6. The air pressure Pa is detected by the air pressure sensor 50.
When the cushion pad 28 is pushed down via the wrinkle holding ring 30 and the cushion pin 24 during the press working, the wrinkle holding load Fs corresponding to the air pressure Pa is applied to the wrinkle holding ring 30. A plurality of air cylinders 42 are provided as needed, and the pressure chambers of these air cylinders 42 are connected to a common air tank 44. Further, the pressure chambers of the large number of hydraulic cylinders 32 are communicated with each other, and hydraulic oil is supplied from the electric pump 34 and the electromagnetic on-off valve 36 is controlled to be opened and closed, whereby the oil pressure Ps in the pressure chambers is increased. Is adjusted. The oil pressure Ps is detected by the oil pressure sensor 38. The hydraulic pressure Ps is adjusted so that the wrinkle pressing load Fs acts on the plurality of cushion pins 24 substantially uniformly. Cushion pad 28, hydraulic cylinder 3
The pressure equalizing cushion device 51 is configured by including the 2 and the cushion pin 24.

On the other hand, the plunger 22 is connected to the slide plate 20 via a die height adjusting mechanism 52, as shown in FIG. The die height adjusting mechanism 52 is disposed on a screw shaft 54 integrally provided on the plunger 22, and has a nut member 56 screwed onto the screw shaft 54 and a worm wheel 58 fixed to the nut member 56. And a servomotor 60 for rotationally driving the worm screwed onto the worm wheel 58. Then, the worm wheel 58 and the nut member 56 are rotationally driven in both forward and reverse directions by the servo motor 60, so that the height position of the die height adjusting mechanism 52 with respect to the screw shaft 54, that is, the relative distance h of the slide plate 20 with respect to the plunger 22. Be changed.
The relative distance h is detected by the rotary encoder 59 (see FIG. 4) provided in the servo motor 60.
As the relative distance h increases, the slide plate 20
Is lowered with respect to the plunger 22, and the plunger 2
Since the pressing force when 2 reaches the descending end is changed, the relative distance h is adjusted according to the press load Fp when performing the drawing process. The four plungers 22 are connected to the slide plate 20 via the die height adjusting mechanism 52, and the relative distance h is adjusted. In addition, each plunger 22 has a strain gauge 6
1 is attached to detect the respective loads Foi (i = 1, 2, 3, 4) acting on the individual plungers 22. The load Foi is obtained from a data map or the like that stores the relationship between the output signal of the strain gauge 61 and the measurement value by the load measuring device 100 shown in FIG. 7.

The die height adjusting mechanism 52 is a piston 6 of a hydraulic cylinder 62 provided to prevent overload.
4, the housing of the hydraulic cylinder 62 is integrally arranged on the slide plate 20. The pressure chamber of the hydraulic cylinder 62 is filled with hydraulic oil, and the pressure chamber is communicated with the oil chamber 68 of the cylinder 66. Air chamber 70 of cylinder 66
Is communicated with an air tank 72, and the air tank 72 is an electromagnetic ON / OFF supply / exhaust valve 7.
Is connected to the pressure air source 48 via
The air pressure Pc in the air chamber 70 and the air tank 72 is adjusted by switching the N / OFF supply / exhaust valve 74. The air pressure Pc is detected by the air pressure sensor 76. This air pressure Pc causes the piston to retreat to the air chamber 70 side when an excessive load is applied to the hydraulic cylinder 62, causing the die height adjusting mechanism 52 to move.
And the slide plate 20 are allowed to approach each other, and the pressure is adjusted according to the press capability of the press machine 10 so as to prevent damage to the press machine 10, the mold, and the like. The hydraulic cylinders 62, the cylinders 66, the air tank 72, etc. are arranged at the connecting portions of the four plungers 22 and the slide plate 20, respectively, and the air pressure Pc is respectively set.
Is regulated.

Further, the slide plate 20 is connected to four balancer air cylinders 80 arranged in a machine frame 78 (see FIG. 2) of the press machine 10. The pressure chamber of the air cylinder 80 is communicated with an air tank 82, and the air tank 82 is of an electromagnetic ON / O type.
The pressure air source 48 is connected via the FF air supply / exhaust valve 84, and the air pressure Pb in the pressure chamber or the air tank 82 is adjusted by switching control of the ON / OFF air supply / exhaust valve 84. Has become. This air pressure P
The pressure b is detected by the air pressure sensor 86 and adjusted so as to balance with the weights of the slide plate 20 and the die die 18. The pressure chambers of the four air cylinders 80 are connected to a common air tank 82.

The press machine 10 is equipped with a controller 90 as shown in FIG. 4, and outputs from the air pressure sensors 50, 86, 76, the hydraulic pressure sensor 38, the rotary encoder 59, and the strain gauge 61. Air pressure P
Signals representing a, Pb, Pc, hydraulic pressure Ps, relative distance h, and load Foi are supplied to the controller 90, respectively. The controller 90 is composed of a microcomputer having a CPU, a RAM, a ROM, an input / output interface circuit, an A / D converter, etc., and uses the temporary storage function of the RAM while performing signal processing according to a program stored in the ROM in advance. Then, a drive signal for switching the ON / OFF supply / exhaust valves 46, 84, 74 and the opening / closing valve 36, and changing the operating states of the pump 34 and the motor 60 is output. In the figure, the motor 60, strain gauge 61, O
Although only one N, OFF supply / exhaust valve 74, and one air pressure sensor 76 are shown, the same processing is performed for each of the number of press machines 10, four in this embodiment.

A keyboard 92, a setting device 92 such as a personal computer, and a transceiver 94 are also connected to the controller 90. Machine information specific to the press machine 10 is input from the setting device 92 in advance, while the transceiver 94 receives the machine information. Mold information unique to the mold to be used is entered. That is, the punch die 12 stores the die information peculiar to the die and has an ID card 96 having a transmission function and a built-in battery (see FIG. 2).
(Refer to FIG. 3), the mold information is transmitted from the ID card 96 by receiving the data capture signal transmitted from the transceiver 94, and the mold information is transmitted to the controller 90 via the transceiver 94. It is taken in. FIG. 6 is a functional block diagram of the ID card 96, showing a mold information memory 125 storing mold information,
A transmission / reception control CPU 126, a transceiver 127, and a press working condition data memory 128 are provided.

The machine information and the mold information are the air pressures Pa, Pb, and
Information necessary to determine the hydraulic pressure Ps and the relative distance h,
For example: In addition, the mold information,
It also includes information such as the type of mold, that is, vehicle type, product number, press machine used, and process. (Machine information) -Weight of cushion pad 28-Weight of cushion pin 24-Wp of slide plate 20-Pressure area Aa of air cylinder 42-Pressure area of air cylinder 80 (total of four) Ab-Hydraulic cylinder Pressure receiving area As of 32. Bulk elastic coefficient K of hydraulic oil supplied to the hydraulic cylinder 32. Average driving dimension Xav of piston of the hydraulic cylinder 32. Oil amount V. h-Fpi tentative characteristic (Fpi = a.h). Mold information) -Weight Wr of wrinkle retainer ring 30-Weight Wu of upper die (die die 18) -Wrinkle retainer load Fso-Press load Fpoi-Number of cushion pins 24 used n

Here, the weight Wa of the cushion pad 28
Is a value obtained by subtracting the sliding resistance. For example, by using the load measuring device 100 shown in FIG. 7 to measure the load by the slide plate 20 while changing the air pressure Pa, the load-air pressure It can be obtained from the characteristics. The load measuring device 100 includes a punch type 12 and a die type 1.
8. A box-shaped positioning member 102, which is arranged on the press machine 10 instead of the wrinkle holding ring 30 to measure the load on each part of the press machine 12, is fixed on the bolster 14 and its positioning. The load measuring table 106 is housed inside the member 102 so as to be vertically movable, and has a lower surface on which a plurality of pins 104 corresponding to the plurality of cushion pins 24 are projected. Positioning member 10
A large number of notched holes 108 are formed in 2 so that the plurality of cushion pins 24 can be arranged, and the load measuring table 106 is provided with a plurality of notched holes 108 that are inserted through the through holes 26 and the notched holes 108. It is adapted to be placed on the cushion pin 24 via the pin 104. The positioning member 1
The columnar parts 1 are projected at the four corners of 02 so as to project upward respectively.
10 is provided, and four clamped members 112 are fixedly provided at the four corners of the upper surface of the load measuring table 106 where drawing is generally performed, that is, the portions where wrinkle pressing is performed. , Columnar portions 110 thereof, member to be pressed 1
Strain gauges 114 and 116 are attached to 12, respectively. Further, the strain gauges 118 are attached to the plurality of pins 104 at predetermined positions as necessary. Then, the strain gauges 114, 116, 118 are
The load waveform is recorded by the electromagnetic oscilloscope 122, which is connected to the dynamic strain gauge 120 having an amplification function, a zero adjustment function, and the like. The positioning member 102 and the load measuring table 1
06, the clamped member 112 has higher rigidity than that of a normal die. The strain gauges 114, 116 and 118 are each a columnar portion 110, a pinched member 112 and a pin 1.
Four of them are attached around 04, and they are connected so as to form a bridge circuit. The strain gauge 114
Is for measuring the outer load (wrinkle pressing load) of the double action type press machine.
Is for measuring the inner load (forming load) of the double action type press machine or the press load of the single action type press machine. The strain gauge 118 measures the transmission load of each cushion pin 24 of the pressure equalizing cushion device 51. It is for measuring.

When measuring the load of the single-action type press machine 10, the slide plate 20 is lowered by the plunger 22 and abuts against the clamped member 112 of the load measuring table 106 supported on the cushion pin 24. , The load measuring table 106 is the air cylinder 42.
The strain gauge 11 is lowered against the urging force of the strain gauge 11 and the load at that time is applied to the four clamped members 112.
6 respectively. Further, when the slide plate 20 further descends and the load measuring table 106 comes into contact with the positioning member 102, the load detected by the strain gauge 116 sharply increases corresponding to the rigidity of each part of the press machine 10. FIG. 8 exemplifies a load change detected by the strain gauge 116 provided on any one of the columns 112. The load Fsi corresponds to the wrinkle holding load, the load Ffi corresponds to the forming load, and FIG. The load Fpi is the press load that is the sum of them. Further, FIG. 9 is a graph in which the wrinkle pressing load Fsi is measured while changing the air pressure Pa of the air cylinder 42, and the load Fxi obtained from this graph is obtained.
Based on the above, the weight Wa of the cushion pad 28 is obtained. That is, the measured values Fxi (i = 1, 2,
By subtracting the weights of the load measuring table 106 and the cushion pin 24 from the total load Fx of 3, 4), the weight W
a is required. The weight Wa can also be obtained from the graph of the total load Fs of the wrinkle pressing load Fsi and the air pressure Pa. The weight Wa is the actual weight of the cushion pad 28 minus the sliding resistance of the air cylinder 42, and the press machine 10 includes the air leak of the air cylinder 42 and the detection error of the air pressure sensor 50. It is a unique value. It should be noted that the actual weight of the cushion pad 28 and the sliding resistance can be separately used as machine information.

The weight Wp of the cushion pin 24 is an average value of a large number of cushion pins 24 used in the press machine 10, and the weight Ws of the slide plate 20 corresponds to a guide member (not shown) for guiding the slide plate 20. The value is obtained by subtracting the sliding resistance between the two. In particular,
By operating the press machine 10 to detect the load Foi when the slide plate 20 is descending by the strain gauge 61, and by changing the air pressure Pb of the air cylinder 80, the total load F of the strain gauges 61 at four locations.
The o-air pressure Pb characteristic is obtained, and the weight Ws can be obtained from the total load Fo-air pressure Pb characteristic in the same manner as the cushion pad 28. The sliding resistance can be set separately as machine information. Further, the pressure receiving area Aa of the air cylinder 42 takes into consideration the air leakage of the air cylinder 42, and for example, the wrinkle pressing load F is
The slope of the graph of the total load Fs of si and the air pressure Pa corresponds to the pressure receiving area Aa. When a plurality of air cylinders 42 are provided, the total area is set as the pressure receiving area Aa. The pressure-receiving area Ab of the air cylinder 80 is the total of the four air cylinders 80, and is calculated from the total load Fo-air pressure Pb characteristic like the pressure-receiving area Aa. The pressure receiving area As of the hydraulic cylinder 32 is an average value of a large number of hydraulic cylinders 32. For example, when obtaining the characteristics of the wrinkle pressing load Fsi and the air pressure Pa in FIG. 9, the hydraulic pressure Ps is detected by the hydraulic pressure sensor 38, It can be obtained from the total wrinkle pressing load Fs-hydraulic pressure Ps characteristic.

Further, the bulk elastic coefficient K is determined according to the hydraulic oil to be used, and the average drive-in dimension Xav is for uniformly contacting the plurality of cushion pins 24 with the wrinkle holding member such as the wrinkle holding ring 30. This is the downward stroke of the piston of the hydraulic cylinder 32, and the pistons of the hydraulic cylinder 32 are driven downward by all the cushion pins 24 regardless of variations in the length dimension of the cushion pin 24 and the inclination of the cushion pad 28. In order to prevent the piston of the hydraulic cylinder 32 from reaching the stroke end irrespective of the impact applied to the cushion pin 24 when the slide plate 20 descends, experimentally beforehand, or variations in the length dimension of the cushion pin 24 and the hydraulic cylinder are performed. It is determined based on the maximum stroke of the 32 pistons and the like. The oil amount V is the total volume of hydraulic oil existing on the hydraulic cylinder 32 side of the check valve 39 (see FIG. 2) when the piston of each hydraulic cylinder 32 is positioned at the rising end.

Temporary characteristics of h-Fpi (i = 1, 2, 3, 4)
Is the press load F when the plunger 22 reaches the lower end.
It is a characteristic of pi and relative distance h, but this varies depending on the rigidity of the mold used. Therefore, a member having higher rigidity than the normal mold is interposed, and the relative distance h is variously changed. The gauge 61 measures the press load Fpi when the plunger 22 reaches the lower end.
It reflects a stiffness of 0. When measuring the h-Fpi temporary characteristic, the slide plate 20 is balanced with the lifting force of the air cylinder 80.
The air pressure Pb is adjusted so that 0 is lowered by the plunger 22. The alternate long and short dash line in FIG. 10 illustrates an example of such a h-Fpi tentative characteristic (Fpi = a · h), which is determined based on the maximum value h ₀ of the relative distance h when the press load Fpi is 0. ing. Also, this h-
The Fpi temporary characteristic is defined for each of the four die height adjusting mechanisms 52, and the total press load Fp is the sum of each Fpi. It should be noted that the load measuring apparatus 100 can be used to obtain the h-Fpi temporary characteristic from the load Fpi in FIG.

Wrinkle pressing ring 30 in the mold information
The weight Wr of the die die 18 and the weight Wu of the die die 18 are actual measured values measured after the wrinkle retainer ring 30 and the die die 18 are manufactured, and the wrinkle retainer load Fso and the press load Fpoi.
For (i = 1, 2, 3, 4), the wrinkle retainer ring 30, the die die 18, and the punch die 12 are attached to a trial tri-press for actual press working to obtain a proper pressed product. The load condition is obtained by trial and error. Wrinkle pressing load Fso and pressing load F
poi eliminates the influence of the weight of the mold and the sliding resistance of each part of the tri-press. For example, when using a tri-press configured similarly to the press machine 10 in FIGS. The air pressure Pb is adjusted so that the slide plate 20 is lowered by the plunger 22 in a state where the plate 20 and the die die 18 and the lifting force by the air cylinder 80 are balanced, and when the press working is performed in that state, the strain gauge 61 Load F detected by
It can be calculated based on oi. The wrinkle pressing load Fso in this case is the entire load, but the press load Fpoi is 4
With the press load at each location, the total press load is the sum of those press loads Fpoi. The number n of cushion pins 24 used is determined according to the shape of the wrinkle pressing ring 30 and the like so that an appropriate pressed product can be obtained.

The press working condition data memory 1 shown in FIG.
28 is a relative distance h ^* corresponding to the machine number of the press machine 10 ^.
Is written in via the transceivers 94 and 127 and read into the press machine 10 via the transceivers 127 and 94. This relative distance h ^* is
A value after adjusting the relative distance h of the die height adjusting mechanism 52 so that when the die is actually attached to the press machine 10 and the press working is performed, the press working is performed with the press load Fpoi as the die information. Therefore, the plurality of press machines 10 can be stored. Therefore, when pressing is performed again by the same press machine 10, the relative distance h of the die height adjusting mechanism 52 is adjusted according to the relative distance h ^* corresponding to the machine number,
Pressing is performed with the pressing load Fpoi. Relative distance h
^When the relative distances h at the four locations are adjusted as in the press machine 10 of the present embodiment, ^* is stored for each of the four locations, but the single servo motor etc.
If the relative distance h of a location is uniformly adjusted, the single relative distance h ^* is stored.

Returning to FIG. 4, the controller 90 is
By performing signal processing according to a predetermined program in the ROM, the functions shown in FIG. 5 are executed. In FIG. 5, the machine information memory 130 stores the machine information previously input by the setting device 92.
Stores the mold information read from the ID card 96 by the transceiver 94 when the mold is attached to the press machine 10. If the press condition data memory 128 of the ID card 96 stores data regarding the relative distance h ^* of the same machine number as that of the press machine 10,
Data regarding the relative distance h ^{* is} also included in the mold information memory 13
Stored in 2. Further, the air pressure Pax calculation block 134
Is an air pressure Pax for generating a wrinkle holding load Fso set as mold information based on the machine information stored in the machine information memory 130 and the mold information stored in the mold information memory 132. Is calculated according to the following equation (2). The air pressure Pa adjustment block 136 is turned on and off so that the air pressure Pa in the air tank 44 detected by the air pressure sensor 50 becomes the calculated air pressure Pax.
The supply / exhaust valve 46 is switch-controlled. As a result, wrinkle pressing is performed with the wrinkle pressing load Fso set as the mold information. The capacity of the air tank 44 is sufficiently large, and the fluctuation of the air pressure Pa due to the volume change of the air cylinder 42 accompanying the lowering of the cushion pad 28 is almost negligible. It can also be calculated.

[0028]

## EQU00002 ## Pax = (Fso + Wa + Wr + n.Wp) / Aa (2)

The hydraulic pressure P ₀ , P ₁ calculation block 138 calculates the hydraulic pressure P ₀ and P _{1 based on} the machine information stored in the machine information memory 130 and the mold information stored in the mold information memory 132.
An initial hydraulic pressure for causing the wrinkle holding load Fso to act on the wrinkle holding ring 30 substantially evenly via each cushion pin 24,
That is, the hydraulic pressure P ₀ in a state where the die die 18 is not in contact with the wrinkle retainer ring 30 is calculated from the relationship of the following expression (3), and each cushion pin is pressed at the time of press work in which the wrinkle retainer ring 30 is pressed by the die die 18. 24
The target hydraulic pressure P ₁ when the wrinkle pressing load Fso is evenly applied to is calculated from the relationship of the following equation (4). Then, the hydraulic pressure Ps adjustment block 140 first controls the pump 34 and the on-off valve 36 so that the initial hydraulic pressure of the hydraulic pressure Ps detected by the hydraulic pressure sensor 38 becomes the initial hydraulic pressure P ₀ . As a result, at the time of press work in which the wrinkle press ring 30 is pressed by the die die 18, basically, the piston of each hydraulic cylinder 32 is pressed by the average drive-in dimension Xav, and the wrinkle press load Fso is applied via each cushion pin 24. Although it is applied to the wrinkle holding ring 30 substantially evenly, the initial elastic pressure P ₀ is not always accurate because the bulk elastic coefficient K is not necessarily constant due to the inclusion of air. For this reason, the hydraulic pressure Ps adjustment block 140 determines that the hydraulic pressure Ps
After adjusting s to the initial hydraulic pressure P ₀ , the hydraulic pressure Ps at the time of press working is actually read when the test press is actually performed, and the initial hydraulic pressure P ₁ is adjusted so that the hydraulic pressure Ps substantially matches the target hydraulic pressure P _1.
Correct ₀ . That is, when the hydraulic pressure Ps during the press working is higher than the target hydraulic pressure P ₁ , the wrinkle pressing ring 30 is not in contact with a part of the cushion pins 24, and the wrinkle pressing load Fso acts unevenly on the remaining cushion pins 24. for the case it is, cushion pins 2 by lowering the initial pressure P ₀
The drive-in amount of 4 may be increased as a whole. Further, when the hydraulic pressure Ps during press working is lower than the target hydraulic pressure P ₁ , the pistons of some of the hydraulic cylinders 32 reach the stroke ends and part of the wrinkle pressing load Fso acts directly on the cushion pad 28. Therefore, the initial hydraulic pressure P ₀ may be raised so as not to reach the stroke end.
The test press is performed with the air pressure Pa adjusted so that the wrinkle holding load Fso is obtained.

[0030]

[Formula 3] Xav = (Fso−n · As · P ₀ ) V / n ² · As ² · K (3) Fso + Wr + n · Wp = n · As · P ₁ (4)

The air pressure Pbx calculation block 142 calculates the air pressure Pbx for lifting the slide plate 20 and the die 18 by a force balanced with the slide plate 20 and the die 18 based on the machine information and the die information according to the following equation (5). The air pressure Pb adjusting block 144 is turned on and off so that the air pressure Pb in the air tank 82 detected by the air pressure sensor 86 becomes the calculated air pressure Pbx.
Switch control. As a result, the press work can be performed with each press load Fpoi set as the mold information without being affected by the weights of the slide plate 20 and the die mold 18. The capacity of the air tank 82 is sufficiently large, and the fluctuation of the air pressure Pb due to the volume change of the four air cylinders 80 accompanying the lowering of the slide plate 20 is almost negligible. The pressure Pbx can also be calculated.

[0032]

(4) Pbx = (Wu + Ws) / Ab (5)

The relative distance h adjusting block 146 is used for the die height adjusting mechanism 5 according to the flowchart of FIG. 11, for example.
Adjust the relative distance h of 2. In step R1, and determine whether the data relating to the relative distance h ^* in the mold information memory 132 is included, executes the step R7 if any data regarding the relative distances h ^*, relative distance h
^When there is no data regarding ^* , that is, when the die is attached to the press machine 10 of the present embodiment for use for the first time, step R2 is executed.

FIG. 12 is a flow chart for explaining the concrete contents of step R2. First, step R2-1.
Then, the h-Fpi temporary characteristic and the press load Fpoi are read from the machine information memory 130 and the mold information memory 132, respectively, and in step R2-2, the relative value when the load Foi obtained from the output signal of the strain gauge 61 is zero. A reference value h ₀ that is the maximum value of the distance h is determined. This is done by, for example, performing a trial hit while increasing the relative distance h from the minimum value by a predetermined constant amount, and obtaining the relative distance h when the load Foi becomes a predetermined value or more, or the relative distance h is set to the minimum value. In this state, the slide plate 20 may be lowered to the lower end (bottom dead center), and in that state, the relative distance h may be increased until the load Foi becomes equal to or more than a predetermined value. It is also possible for an operator to visually observe and set the contact state of the mold.

At step R2-3, the h-F indicated by the one-dot chain line in FIG. 10 set as the machine information is set.
The relative distance h _{1 at} which the press load Fpoi is obtained is obtained from the pi temporary characteristic (Fpi = a · h), and the relative distance h is adjusted to h ₁ by the servomotor 60 with the reference value h ₀ as a reference.
In Step R2-4, the press machine 10 is set to 1 in that state.
The cycle operation is performed, and in step R2-5, the load Foi represented by the output signal of the strain gauge 61 at the descending end is set as the press load Fp ₁ . Since the preset h-Fpi temporary characteristic is set on the basis of the case where the rigidity is higher than that of a normal die, the press load Fp ₁ is generally smaller than the press load Fpoi. In the following step R2-6, the relative distance h is changed to the relative distance h ₂ which is smaller than the relative distance h ₁ by a predetermined change amount Δh, and the step R2-7,
The press load Fp ₂ is measured with R2-8 in the same manner as above. Then, in Step R2-9, the h-Fpi main characteristic (Fpi = b · h) shown by the solid line in FIG. 10 is obtained based on the change amount Δh and the press loads Fp ₁ and Fp ₂ , and Step R2 At -10, the relative distance hx at which the press load Fpoi is obtained is calculated from the h-Fpi main characteristic, and the servo motor 60 controls so that the relative distance h becomes hx. The adjustment of the relative distance h is independently performed for the four die height adjusting mechanisms 52 in the same manner as described above.

Returning to FIG. 11, in the next step R3,
With the relative distance h adjusted to hx as described above, the press machine 10 is operated for one cycle, and in step R4,
It is determined whether or not the difference | Foi-Fpoi | between the load Foi and the press load Fpoi represented by the output signal of the strain gauge 61 at the descending end is smaller than a predetermined constant value α.
The constant value α is determined in consideration of detection error, control accuracy, etc., and the relative distance h is corrected in step R6 until the difference becomes smaller than α. As a result, irrespective of the difference in the rigidity of each press machine 10 and the like, good press working is performed with each press load Fpoi set as mold information. In step R5, the relative distance h represented by the output signal of the rotary encoder 59 is transmitted as relative distance h ^* data from the transceiver 94 to the ID card 96 together with the machine number of the press machine 10,
The data is written in the press processing condition data memory 128 of the ID card 96. When the data of the relative distance h ^* regarding the press machine 10 already exists in the press working condition data memory 128, the content is rewritten as necessary.

On the other hand, if the determination in step R1 is YES, that is, if the die has already been pressed, the relative distance h ^* data and the press load Fpoi are set in step R7. The information is read from the information memory 132, and in step R8, the relative distance h is adjusted to be h ^* by the servo motor 60. After that, the above steps R3 and thereafter are executed so that the load Foi is the press load F.
Check if it matches with poi and correct the relative distance h if necessary.

In addition to the above controls, the controller 90 also determines the load Foi at four points detected by the strain gauge 61, which is a predetermined overload prevention load Foli (i = 1, 2, 3, 4). ),
The air pressure Pc is controlled. That is, when the overload preventing load Foli acts on the hydraulic cylinder 62 for preventing overload due to the presence of foreign matter, the cylinder 6
The piston 6 moves backward to the air chamber 70 side and the hydraulic cylinder 6
2 to allow the hydraulic oil to flow into the oil chamber 68 so that the slide plate 20 and the plunger 22 can approach each other, the pressure receiving area of the hydraulic cylinder 62 and the pressure receiving of the oil chamber 68 and the air chamber 70 of the cylinder 66. Air pressure P based on area
cx is set, and the air pressure Pc is the air pressure Pcx.
Thus, the ON / OFF supply / exhaust valve 74 is controlled to be switched. The pressure control of the air pressure Pc is independently performed for each of the four cylinders 66. This prevents damage to the press machine 10, the mold, etc. due to an excessive press load. Since the air pressure Pc can be set independently of the mold used, it may be adjusted in advance by manual operation or the like.

Here, the press machine 10 of the present embodiment.
In accordance with the machine information specific to the press machine 10 stored in advance in the machine information memory 130 and the mold information unique to the mold read from the ID card 96 via the transceiver 94, the rigidity of each press machine and Regardless of the difference in sliding resistance etc. of each part, the press condition for performing the appropriate press working obtained by the tri-press, that is, the wrinkle holding load Fso and the press load Fpoi are reproduced,
Since the air pressures Pa, Pb, the hydraulic pressure Ps, and the relative distance h are automatically adjusted, troublesome adjustment work due to trial and error is eliminated, the burden on the operator is greatly reduced, and excellent quality is achieved. The pressed product can be obtained stably.

Regarding the relative distance h, when the die is first attached to the press machine 10 and press working is performed, the relative distance h is obtained by performing trial striking based on the h-Fpi temporary characteristic and the press load Fpoi. h is adjusted, but the relative distance h after the adjustment is stored in the ID card 96 as the relative distance h ^* data, and when the die is attached to the same press machine 10 for press working, that Since the relative distance h is quickly adjusted using the relative distance h ^* data, the time required for the adjustment is shortened and the operating rate of the press machine 10 is improved.

In this embodiment, steps R2 and R in FIG.
3, R4, R6 are relative distances h as press working conditions
Is an adjusting process, step R5 is a storing process, and steps R7 and R8 are reproducing processes. In the series of signal processing by the controller 90, the above step R
The part that executes 2, R3, R4 and R6 corresponds to the adjusting means, and the part that executes steps R7 and R8 corresponds to the reproducing means. The transceiver 94 and the ID card 96 correspond to input means for inputting the press load Fpoi as mold information, and the press processing condition data memory 12 of the ID card 96.
Reference numeral 8 corresponds to a storage means.

As for the hydraulic pressure Ps, the adjusted hydraulic pressure value Ps ^* is set in the same manner as the relative distance h.
It may be stored in the ID card 96 as a pair with the machine number, and the hydraulic pressure Ps may be immediately adjusted to the hydraulic pressure value Ps ^* when the same mold is used again. Air pressure Pa, Pb
Can be adjusted relatively easily in accordance with the arithmetic expressions (2) and (5), but in the case of adjustment due to a try end error, those adjustment values are also stored in the ID card 96 as necessary. It doesn't matter.

Next, another embodiment of the present invention will be described. Since the mechanical structure of the press machine in the following embodiments is the same as that of the first embodiment, the same reference numerals will be used for description.

The display operation panel 168 of FIG. 13 is used for setting the hydraulic pressure Ps of the pressure equalizing cushion device 51, etc., and is connected to the controller 90 to exchange signals. In this embodiment, the controller 9
At 0, there is a trial hit switch signal indicating that the trial hit switch of the press machine 10 has been turned on, and a bottom dead center signal indicating that the slide plate 20 has reached the substantially lower end (bottom dead center or slightly before). It is being supplied. Further, in the press working condition data memory 128 of the ID card 96, data relating to the equalizing initial hydraulic pressure Ps ^* is stored together with the machine number of the press machine 10. Then, the hydraulic pressure Ps is adjusted according to a program stored in advance in the controller 90, for example, according to the flowchart of FIG.

In FIG. 14, in step S1, it is determined whether or not the changeover switch 172 of the display operation panel 168 is selectively operated to "automatic" indicating the automatic pressure equalization setting.
When "automatic" is selected, it is determined in step S2 whether the operation preparation push button 174 of the display operation panel 168 has been pushed. When the operation preparation push button 174 is not pushed, step S3 is executed to determine whether or not the mold information memory 132 contains data regarding the equalizing initial hydraulic pressure Ps ^* . Pressure equalizing initial hydraulic pressure Ps
If data regarding ^* exists, step S5 is executed, but if not, that is, if the mold is used for the press machine 10 for the first time, step S1 and subsequent steps are repeated, and the operation preparation push button 174 is pressed. By doing so, step S4 is executed.

Step S4 is specifically performed according to the flowchart of FIG. 15. First, in step S4-1, the air pressure Pa is adjusted so that the wrinkle holding load Fso is obtained. This is because the initial hydraulic pressure Ps that is equalized is
This is because it depends on the air pressure Pa, that is, the wrinkle pressing load Fs, and when adjusting the hydraulic pressure Ps, the wrinkle pressing load F
It is premised that the air pressure Pa is regulated so that so can be obtained. The air pressure Pa may be obtained by obtaining the air pressure Pax in accordance with the above-described calculation formula (2). Wrinkle presser load F
s may be obtained and the wrinkle pressing load Fs may be adjusted so as to substantially match Fso. In addition, the next step S
In 4-2, the pressure-equalized initial hydraulic pressure P _n (n = 1 to 10) is set. Equalization initial oil pressure P _n is in the range from 20 kgf / cm ² to 200kgf / cm ² 20kgf / cm
It is stored in advance at ^two intervals and is set in order from the high voltage side. Note that 1 kgf / cm ² is about 9.
It is 8 × 10 ⁴ Pa (pascal).

In step S4-3, the initial hydraulic pressure Ps during non-press working is equalized initial hydraulic pressure P _n set in step S4-2, that is, 200 kgf /
The pump 34 and the on-off valve 36 are controlled while reading the hydraulic signal from the hydraulic sensor 38 so that the pressure becomes cm ² .
Becomes a pressure Ps ≒ P _n, ring the buzzer in a predetermined pattern indicating the ready at step S4-4, testing golfer switch of the press machine 10 in step S4-5, it is determined whether the ON operation. When an operator who hears the buzzer turns on the trial hit switch and a trial hit switch signal is supplied, the buzzer is stopped in step S4-6,
At the next step S4-7, the hydraulic pressure Ps when the press machine 10 is operated for one cycle by the ON operation of the trial hit switch, that is, the generated hydraulic pressure PX _n is read and stored, and is displayed on the display 176 of the display operation panel 168. indicate. Since the change in hydraulic pressure during press working is accompanied by vibration due to impact as shown in FIG. 16, in the present embodiment, the hydraulic pressure Ps near the bottom dead center SL at which the vibration becomes small, that is, from the press machine 10 to the bottom dead center. The oil pressure Ps represented by the oil pressure signal of the oil pressure sensor 38 when the signal is supplied is read as the generated oil pressure PX _n . It is also possible to use another hydraulic pressure value such as the maximum value, the minimum value, or the average value of the hydraulic pressure Ps up to the bottom dead center SL as the generated hydraulic pressure. Further, the oil pressure Ps detected by the oil pressure sensor 38 is constantly displayed on the display 170 regardless of whether the press working is performed or not.

In the next step S4-8, the change amount ΔPX = between the current generated hydraulic pressure PX _n and the previous generated hydraulic pressure PX _n-1.
| PX _n −PX _n−1 | is calculated, and in step S4-9, it is determined whether or not the variation ΔPX is equal to or less than a preset determination value β. The determination value β is used to determine whether or not the generated hydraulic pressure PX _n is substantially constant regardless of the change in the equalized initial hydraulic pressure P _n , and considers variations in the generated hydraulic pressure PX _n , hydraulic pressure detection errors, and the like. Then, for example, a value of about 5 kgf / cm ² is set. Then, when the change amount ΔPX ≦ β,
After "1" and the flag F in step S4-10, in step S4-11, of provided 10 to the display control panel 168 for each pressure equalization initial oil pressure P _n equalizing圧初life hydraulic area display lamp 178 , Previous pressure equalization initial hydraulic pressure P
_Turn on the lamp corresponding to _n-1 . Also, the amount of change ΔPX
If> β, flag F is determined in step S4-12.
= 1 is determined, and if F = 1, step S4-
After the flag F is set to "0" in 13, the above step S4-1 is performed.
Execute 1. In the following step S4-14, it is determined whether or not the equalization initial hydraulic pressure P _n = 20 kgf / cm ^2, that is, the generated hydraulic pressure PX for all the equalization initial hydraulic pressure P _n.
It is judged whether or not the detection of _n is completed, and P _n = 20 kgf
/ Cm ² is reached, the execution of step S4-2 and subsequent steps is repeated while changing the setting of the equalizing initial hydraulic pressure P _n . In the first cycle in which the equalizing initial hydraulic pressure P _n is 200 kgf / cm ² , steps S4-8 to S4-13 are omitted, and step S4-7 is followed by step S4-14.
To execute.

[0049] Figure 17 shows the above step S4-2 by the following is repeated, a graph showing an example of the equalization initial oil pressure P _n detected generated hydraulic pressure PX _n for each, pressure equalization initial oil pressure P ₄ = 140 kgf / cm ² generated hydraulic pressure PX
₄ is 200 kgf / cm ² , equalizing initial hydraulic pressure P ₅ = 12
Generated oil pressure PX ₅ at 0 kgf / cm ² is 198 kgf
/ Cm ² . Therefore, the equalized initial hydraulic pressure P ₅ = 12
In the case of 0 kgf / cm ² , the variation ΔPX = | PX ₅
-PX ₄ | = 2 kgf / cm ² , the determination in step S4-9 is YES, and in step S4-11, the lamp for the previous equalizing initial hydraulic pressure P ₄ = 140 kgf / cm ² is turned on. Pressure equalization initial hydraulic pressure P ₆ = 100 kgf / cm
² , when the pressure equalizing initial hydraulic pressure P ₇ = 80 kgf / cm ² , similarly, the determination in step S4-9 is YES, and the pressure equalizing initial hydraulic pressure P ₅ = 1 in step S4-11.
20 kgf / cm ² , equalizing initial hydraulic pressure P ₆ = 100 kg
Turn on the f / cm ² lamp. Pressure equalization initial hydraulic pressure P ₈ =
In the case of 60 kgf / cm ² , the variation ΔPX = | PX
_8- PX ₇ |> β, the determination in step S4-9 is NO, but the determination in step S4-12 is YES because the flag F = 1 in the previous cycle, and step S4-12 is YES.
At 4-11, pressure equalizing initial hydraulic pressure P ₇ = 80 kgf / c
Turn on the m ² lamp. The pressure equalizing initial hydraulic pressure region display lamp 178 in FIG. 13 indicates a lighting state (hatched line) in this case.

Here, the lighting pressure range of the pressure equalization initial oil pressure region display lamp 178, in other words, the pressure equalization initial oil pressure P.
All of the hydraulic cylinder C region regardless hydraulic pressure generated PX _n of variation ΔPX 17 in the area of small equalization initial oil pressure P _n to _n changes, the cushion pins 24 is involved in the arrangement has been blank-holding This means that the 32 pistons are in a neutral state during press working. The hydraulic pressure range and interval of the pressure-equalizing initial hydraulic pressure P _n set in the step S4-2 are the wrinkle pressing load and the cushion pin 24 depending on the type of press working.
The number of hydraulic cylinders 32, the pressure receiving area, the piston stroke, the setting range of the wrinkle pressing load, and the like are set in advance so that the uniform pressure equalizing initial hydraulic pressure region can be determined regardless of the difference in the number of used cylinders.

It should be noted that some of the hydraulic cylinders 32 are inoperative and some of the other hydraulic cylinders are inactive because, for example, the cushion pins 24 have a large variation in length or the piston stroke of the hydraulic cylinders 32 is small. When the torso state is reached, the pressure equalizing initial hydraulic pressure region does not appear, and the pressure equalizing initial hydraulic pressure region cannot be clearly discriminated, or a plurality of pressure equalizing initial hydraulic pressure regions appear. This means that some abnormality of the pressure equalizing cushion device 51 can be judged from the lighting state of the pressure equalizing initial hydraulic pressure region display lamp 178. It is also possible to display an abnormality when the pressure equalizing initial hydraulic pressure region display lamp 178 is not lit at all or when the lamps are lit in pieces. Further, if the changeover switch 172 is set to "each", the pressure-equalized initial hydraulic pressure setting dial 180 can be manually operated to arbitrarily set the pressure-equalized initial hydraulic pressure P _n. P
By confirming X _n on the display unit 176, it is possible to check the change in the generated hydraulic pressure PX _n while finely changing the equalized initial hydraulic pressure P _n , or to search for the equalized initial hydraulic pressure region by manual operation.

Further, in a region where the pressure equalizing initial oil pressure P _n is low, the change amount ΔPX of the generated oil pressure PX _n with respect to the change of the oil pressure P _n becomes small due to the inclusion of air, etc.
The judgment of 4-9 may be YES. In order to prevent this, for example, the determination in step S4-9 is initially YES.
Is stored, the generated hydraulic pressure PX _n is stored and compared with the generated hydraulic pressure PX _n to determine whether the lamp is turned on,
If the result of the determination in step S4-9 is YES and then NO, it may be possible to immediately execute steps S4-15 and thereafter.

If the determination in step S4-14 is YES, then step S4-15 is executed to determine whether the flag F = 1. When the flag F = 1, in step S4-16, the current equalization initial hydraulic pressure P _n , that is, P ₁₀ = 20 kgf / cm in this embodiment.
The lamp of No. ² is turned on, and step S4-18 is executed after setting the flag F to "0" in step S4-17. If flag F = 0, then step S4-18 is followed by step S4-18. Run. These steps are for the generated hydraulic pressure PX when the equalizing initial hydraulic pressure P ₉ = 40 kgf / cm ^2.
_9, when the change amount ΔPX the hydraulic pressure generated PX ₁₀ when the equalization initial oil pressure P ₁₀ = 20kgf / cm ² is less than determination value beta, for lighting the lamp equalization initial oil pressure P ₁₀ It is a thing.

In step S4-18, the average value of the pressure-equalized initial oil pressure P _n at the lighting portion of the pressure-equalized initial oil pressure region display lamp 178 is calculated, and the average value is set as the pressure-equalized initial oil pressure P ₀ . For example, in the case of the lighting state shown in FIG. 13, (8
0 + 100 + 120 + 140) / 4 = 110kgf / c
m ² is set as the equalizing initial hydraulic pressure P ₀ . By controlling the pump 34 and the opening / closing valve 36 so that the initial hydraulic pressure Ps during non-press working becomes the equalized initial hydraulic pressure P ₀ , all hydraulic cylinders 32 involved in wrinkle holding during press working are neutral. In this state, the drawing process is performed in a state where the surface pressure distribution of the wrinkle retainer is substantially constant.

Returning to FIG. 14, the mold information memory 13
If 2 includes data regarding the equalizing initial hydraulic pressure Ps ^* , that is, if the same die has been used for press working before, step S3 is followed by step S5, The data of the equalized initial hydraulic pressure Ps ^* is read from the mold information memory 132. Then, in step S6, the pump 34 and the on-off valve 36 are controlled so that the hydraulic pressure Ps matches the equalized initial hydraulic pressure Ps ^* .

On the other hand, the display operation panel 168 is provided with a changeover switch 182 for communicating with the ID card 96, and writing and reading are performed according to the flowchart of FIG. In step SS1, the changeover switch 182
Is selected for "write", and if it is selected for "write", the display data of the display operation panel 168 is displayed on the press machine 1 in step SS2.
The ID card 9 is sent from the transceiver 94 together with the machine number of 0.
Write to 6. The display data for such writing is
The hydraulic pressure Ps displayed on the display 170 and the number of cushion pins 24 used on the display 184 are used, and the changeover switch 182 is operated to “write” after adjusting the hydraulic pressure Ps according to the flowchart of FIG. By doing so, the hydraulic pressure display value at that time, that is, the value of the hydraulic pressure Ps during non-pressing that substantially matches the equalizing initial hydraulic pressure P ₀ is taken as the equalizing initial hydraulic pressure Ps ^* , and the press working condition data memory 128 of the ID card 96. It is written together with the machine number. In addition, the cushion pin 24 displayed on the display 184 is
When the number of used lines is different from the used number n stored in the mold information memory 125, the data is rewritten. That is, the equalized initial hydraulic pressure P ₀ obtained according to the flowchart of FIG. 15 differs depending on the number of cushion pins 24 used. Therefore, for example, when the number of cushion pins 24 is changed during actual press working, the ID card 96 is changed. Therefore, it is necessary to rewrite the number n of used pieces stored in. The display unit 184 displays the number of used pieces n stored in the ID card 96 as mold information.
Is displayed, but the numerical value can be changed with the setting dial 186, and the ID can be selected by selecting "write" with the changeover switch 182.
The stored contents of the card 96 are rewritten.

If the determination in step SS1 is NO, that is, if the changeover switch 182 has not been selected for "write", then step SS3 is executed and the changeover switch 182 is selected for "read". Determine whether or not it is being operated. Then, when the operation of selecting “Read” is performed, step SS4 is executed and the transceiver 9
The mold information is read from the ID card 96 via 4 and stored in the mold information memory 132, and the number n of cushion pins used is displayed on the display 184. In that case, if the pressing condition in the data memory 128 having the same device number as the press machine 10 Hitoshi圧初life hydraulic Ps ^* data is stored, the die information read also the average圧初life hydraulic Ps ^* Data It is stored in the memory 132.

In this embodiment, in the case of the first die, the pressure-equalized initial hydraulic pressure P ₀ is obtained according to the flowchart of FIG. 15, and the initial hydraulic pressure Ps at that time is stored in the ID card 96 as the pressure-equalized initial hydraulic pressure Ps ^*. Therefore, when the die is next attached to the same press machine 10 and press working is performed, the hydraulic pressure Ps is quickly adjusted using the equalized initial hydraulic pressure Ps ^* data, which is required for the adjustment. The time is shortened and the operating rate of the press machine 10 is improved. In particular, in this embodiment, the operator has to turn on the trial hit switch when obtaining the pressure-equalized initial oil pressure P ₀ according to the flowchart of FIG. 15, so that the burden on the operator during the second and subsequent die replacement is large. Is reduced to.

In the flow chart of FIG. 15, the operator turns on the test-driving switch of the press machine 10, but if a safety fence or the like is provided around the press machine 10, automatic operation is performed. It is also possible to fully automatically set the equalizing initial hydraulic pressure P ₀ by activating the press machine 10.

In this embodiment, the step of executing step S4 of FIG. 14, that is, each step of FIG. 15 is an adjusting step of adjusting the hydraulic pressure Ps as a press working condition, and steps SS1 and SS2 of FIG. 18 are storing steps. , Steps S5 and S6 of FIG. 14 are the reproduction process. Also, the controller 9
Of the series of signal processing by 0, step S4 in FIG.
That is, the part that executes each step in FIG. 15 corresponds to the adjusting means, and the part that executes steps S5 and S6 corresponds to the reproducing means. The transmitter / receiver 94, the ID card 96, and the changeover switch 182 use the air pressure P when adjusting the hydraulic pressure Ps.
It corresponds to an input means for inputting a wrinkle pressing load Fso as mold information necessary for setting a, and the press working condition data memory 128 of the ID card 96 corresponds to a storage means.

Display operation panel 190 shown in FIGS. 19 to 21.
Are connected to the controller 90 to exchange signals. In this embodiment, the press machine 10
The press stroke, in other words, a signal representing the slide height H is supplied to the controller 90 from a stroke sensor such as a position sensor that detects the position of the slide plate 20 or an encoder that detects the rotation angle of the crankshaft. In addition, the mold information memory 125 of the ID card 96
Stores information about the plate thickness t of the press material as mold information, and the press working condition data memory 128 stores the relative distance h ^* of the die height adjusting mechanism 52 ^.
The data relating to the press machine 10 is stored together with the machine number of the press machine 10. Then, the die height adjusting mechanism 52
The adjustment of the relative distance h in FIG.
It is performed according to the flowchart of. It should be noted that this flowchart shows the operation by the operator together with the operation by the controller 90. Further, in this embodiment, a case where the relative distances h of the four die height adjusting mechanisms 52 are uniformly adjusted by the single servo motor 60 will be described.

At step Q1, the switches (1) and (2) provided on the operation panel of the press machine 10 are operated.
The bolster 14 on which (8, 30) is mounted is moved into the press machine 10, and the bolster 14 is automatically positioned at a predetermined position in step Q2. At this point, the piston of the air cylinder 42 is held at the lower end by a hydraulic brake or the like. After that, in step Q3, the display operation panel 1
When the operator operates the changeover switch 192 of 90 to the "individual" mode and the operator operates the changeover switch 194 to the "setup" mode in step Q4, the setup lamp 196 is turned on. After the operator presses the operation preparation push button 198 in step Q5, when the operator turns on the test hit switch of the press machine 10 in step Q6, the press machine 10 is operated by inching. In step Q7, it is judged whether or not the total value Fp of the press loads represented by the output signal of the strain gauge 61 has reached a preset set load F ₀ , and Fp =
When it reaches F ₀ , the descending of the slide plate 20 is stopped in step Q8. The set load F ₀ is set to a value of, for example, several tons to tens of tons so as not to overload the electric motor or the like of the press machine 10, and is stored in advance as machine information or the like. In addition, it is the "setup" that the lowering of the slide plate 20 automatically stops when Fp = F _0.
This is because the mode has been selected.

In the next step Q9, the die die 18 is fixed to the slide plate 20. The die die 18 is automatically attached by a die clamper or the like, but may be manually attached by an operator using a T-bolt or the like. In step Q10, the slide height H at this time is stored based on the signal from the stroke sensor. In step Q11, the reverse switch of the press machine 10 is operated to raise the slide plate 20 in reverse. To be In step Q12, the stroke sensor or the like detects that the slide plate 20 has reached the top dead center, and the top dead center lamp 200 is turned on, whereby the operator stops the press machine 10.

Next, when the operator operates the changeover switch 194 to the "try" mode in step Q13, the try lamp 202 is turned on. In step Q14, the dimension ΔH from the slide height H to the bottom dead center,
A change amount Δh of the relative distance h is calculated according to the following equation (6) from the plate thickness t of the press material stored as die information and a predetermined additional driving amount x ₀ , and the servo motor 6
0 is driven to change the relative distance h by the change amount Δh. By reducing the dimension ΔH to bottom dead center,
The press load Fp = F ₀ when the slide plate 20 is lowered to the bottom dead center, and the bottom dead center press load Fp = F ₀ when the press material is fed by further reducing the plate thickness t. That is, when the relative distance h is changed by the change amount Δh, the drive-in amount when the press material is introduced and the slide plate 20 is lowered to the bottom dead center is substantially increased by the additional drive-in amount x ₀ . As the additional drive-in amount x ₀ , a value of about 1.0 mm is set, for example.

[0065]

(5) Δh = -ΔH-t + x ₀ (6)

In step Q15, the press material is put in, and in step Q16, the operator turns on the trial hit switch to operate the press machine 10 for one cycle. Step Q
In 17, the pressing load Fp at the bottom dead center during the pressing operation is detected based on the output signal of the strain gauge 61,
The press load Fp is set to F ₁ . And step Q
18, the load values F ₀ and F ₁ and the additional driving amount x
_The load change rate Δa is calculated from _{0 according} to the following equation (7). FIG. 24 shows the load values F ₀ and F ₁ and the additional drive-in amount x _0.
In the graph showing the relationship with, the load change rate Δa corresponds to the slope of this graph. The graph of FIG. 24 corresponds to the h-Fpi main characteristic in the first embodiment and is specific to the press machine.

[0067]

(6) Δa = (F ₁ −F ₀ ) / x ₀ (7)

In step Q19, the ID of the display operation panel 190
When the operator operates the communication switch 204 to the "ON" side and presses the reading push button 206 in step Q20, the mold information is read from the ID card 96 in step Q21. The read mold information is stored in the mold information memory 13
2 stored in the display operation panel 190.
08 is displayed. The display unit 208 displays the press load Fpoi.
Display 210 for displaying the total value Fpo of the
Display 212 for displaying so, display 214 for displaying the weight Wr of the wrinkle pressing ring 30, display 216 for displaying the weight Wu of the upper die (die die 18), and cushion pin 24
The display device 218 and the like for displaying the number n of the used ones are provided.
The “slide load” of the display unit 208 corresponds to the press load, and the “cushion load” corresponds to the wrinkle holding load.

In step Q22, the forming load set value Ffo is obtained by subtracting the wrinkle holding load Fso from the total press load Fpo, and in step Q23, the change amount x ₁ of the relative distance h is calculated according to the following equation (8). At the same time, the servomotor 60 is driven to change the relative distance h by the change amount x ₁ . Thus, the relative distance h is the change amount x
_When the air cylinder 42 for wrinkle presser is held at the lower end by changing only by ₁ , that is, in the state where the wrinkle presser load Fs = 0, as shown in FIG. The pressing load Fp at becomes the forming load set value Ffo.

[0070]

## EQU7 ## x ₁ = (Ffo-F ₁ ) / Δa (8)

In step Q24, the operator turns on the trial-driving switch to operate the press machine 10 for one cycle, and in step Q25, the press load Fp at the bottom dead center during press operation is output from the strain gauge 61. And the difference | Fp−Ffo | between the press load Fp and the molding load set value Ffo is smaller than a predetermined error allowable range γ ₁ . | Fp-F
If fo | ≧ γ ₁ , the relative distance h is changed in step Q26 until | Fp−Ffo | <γ ₁ . Step Q
The determination of 25 may be made by the operator by looking at the actual value of the press load Fp displayed on the display 210, and the correction of the relative distance h may be performed by a switch operation of the press machine 10 by a servo motor. Alternatively, the operator may operate 60 to manually perform the operation. The actual relative distance h detected by the encoder 59 is displayed on the display 220 of the display unit 208.

At step Q27, the slide plate 20 is lowered by operating the switch provided on the operation panel of the press machine 10. At step Q28, the slide plate 20 is stopped at the bottom dead center by operating the switch. In step Q29, the air cylinder 4
The lock of No. 2 is released to raise the cushion pad 28, and in step Q30, the air pressure Pa is adjusted in accordance with the above-mentioned formula (2) so that the wrinkle pressing load Fso is obtained. The weight Wr of the wrinkle holding ring 30 is generally less than 10 tons in the press work of the outer panel of the automobile, which is smaller than other members, and the air pressure Pa may be adjusted by ignoring this. The same applies to the first embodiment.

By adjusting the air pressure Pa in step Q30, the press load Fp detected by the strain gauge 61 increases by the wrinkle holding load Fso, and the next step Q30
In No. 31, the difference between the press load Fp and Fpo | Fp-Fpo |
Is smaller than a predetermined error tolerance γ ₂ is determined. If | Fp−Fpo | ≧ γ ₂ , | Fp−
Fpo | <air pressure Pa is automatically adjusted at step Q30 until _{γ 2, | Fp-Fpo |} < becomes a gamma _2, normal lamp 224 is turned about the press load at step Q32. Then, in step Q33, the ID exchange switch 20
4 is operated by the worker to the "ON" side and the writing push button 226 is pressed in step Q34, the actual relative distance h displayed on the display 220 of the display unit 208 is h ^* data in step Q35. With the machine number of the press machine 10 as I
It is written in the D card 96. The press load Fp, which is the display content of the display 210, is also stored in the press working condition data memory 128 together with the h ^* data.
Other display contents such as the number of cushion pins used on the display 218 and the effective pressure equalizing hydraulic pressure value on the display 228 are also written in the ID card 96 as in the second embodiment.
The setting of the hydraulic pressure Ps has the same function as that of the second embodiment.

Next, with respect to the method of setting the relative distance h when the die is removed from the press machine 10 and then mounted again on the press machine 10 to perform the press working,
This will be described with reference to the flowchart of FIG.

Steps W1 to W3 have the same contents as steps Q1 to Q3 in FIG. 22, and in the next step W4,
The changeover switch 194 is operated to the "try" mode. In step W5, the ID communication switch 204 is operated to the "ON" side, and when the read push button 206 is pressed in step W6, in step W7 the ID card 96 is pressed with the die information and the press having the same machine number as the press machine 10 is pressed. The processing condition data is read and the content is displayed on each display of the display unit 208. In step W8, the servomotor 60 is operated so that the relative distance h matches the h ^* data. This is because the operator looks at the h ^* data displayed on the display 220 and the operator operates the switch of the press machine 10 to operate the servo motor 6
It may be performed by operating 0 or automatically by the controller 90. As a result, the adjustment of the relative distance h is completed, and the same press working conditions as the previous time are reproduced.

In step W9, the slide plate 20 is lowered by inching by operating the switch of the press machine 10,
In step W10, the slide plate 20 is also stopped at the bottom dead center by operating the switch. At this point, the press material has not been charged, but the plate thickness t of the press material is 0.
Since it is about 6 to 0.7 mm, the slide plate 20
Is brought into contact with the die die 18, and there is no fear of overloading the motor or the like. The stop position of the slide plate 20 does not necessarily have to be strictly the bottom dead center. In step W11, the die mold 18 is fixed to the slide plate 20, and in step W12, the lock of the air cylinder 42 is released to raise the cushion pad 28 and the air pressure Pa is adjusted so that the wrinkle pressing load Fso is obtained. . These steps W11 and W12 are performed in the same manner as the above-mentioned step Q9 and steps Q29 and Q30. Then, in step W13, the slide plate 20 is raised to the top dead center, the press blank is put in in step W14, and the press machine 10 is operated for one cycle at a normal process speed in step W15. In step W16, the press load Fp and the wrinkle holding load Fs during press working are confirmed on the indicators 210 and 212, and the actual press worked product is visually observed to set the press working conditions for each part as necessary. Fix it.

Also in this embodiment, in the case of the first die, it is necessary to adjust the relative distance h according to the flowcharts of FIGS. 22 and 23, but the adjustment result is stored in the ID card 96 as h ^* data. As a result, when the die is subsequently mounted on the same press machine 10 for press working, the relative distance h is quickly adjusted using the h ^* data, and the time required for the adjustment is shortened. As a result, the operating rate of the press machine 10 is improved and the burden on the operator is significantly reduced.

Also in this embodiment, it is necessary for the operator to operate the press machine 10 by a switch operation or perform various operations and works when adjusting the relative distance h. For example, "automatic setting" or the like. It is also possible to set the relative distance h fully automatically by operating the switch.

In this embodiment, steps Q6 to Q26 are adjustment steps for adjusting the relative distance h as a press working condition, steps Q33 to Q35 are storage steps, and step W is the step.
5 to W8 is a reproduction process. Further, the press working condition data memory 128 of the ID card 96 corresponds to a storage means.

Although some embodiments of the present invention have been described in detail with reference to the drawings, the present invention can be implemented in other modes.

For example, in the above-described embodiment, the case where the present invention is applied to the press machine 10 that performs drawing is described, but the present invention can be similarly applied to other press machines that perform bending and the like.

Further, in the above-described embodiment, the case where the present invention is applied to the single action type press machine 10 having the pressure equalizing cushion device 51 has been described, but the single action type not having the pressure equalizing hydraulic cylinder 32 is described. A variety of press machines, double-action type press machines, single-action type press machines in which a hydraulic cylinder is provided instead of the air cylinder 42, and a predetermined wrinkle pressing load is applied while the hydraulic oil in the hydraulic cylinder is relieved. The present invention can be applied to press machines of
The press working conditions to be set according to the structure of the press machine are appropriately determined.

Further, in the above-described embodiment, the case where the relative distance h and the hydraulic pressure Ps are adjusted based on the press load Fpoi and the wrinkle holding load Fso as the mold information has been described, but the quality of the pressed product is visually observed. It is also possible to adjust the press working conditions such as the relative distance h and the hydraulic pressure Ps by trial and error.

Further, the relative distance h, which has been described in the above embodiment,
The method of setting the press working conditions such as the hydraulic pressure Ps is merely an example, and the press working conditions can be set by other methods.

Further, although the ID card 96 stores the press working conditions in the above-mentioned embodiment, when the type of the die used is small, the die is stored in the RAM or the like of the computer on the press machine side. The press working conditions may be stored in association with the type of the press machine, or the storage means may be provided separately from the press machine and the mold, and the press working conditions may be stored by combining a plurality of press machines and the mold. You may keep it. Other storage means such as a floppy disk or magnetic tape can also be used.

Although not illustrated one by one, the present invention can be carried out in various modified and improved modes based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to a claim of the second invention.

FIG. 2 is a configuration diagram showing an example of a single action type press machine to which the method and apparatus of the present invention are applied.

FIG. 3 is a configuration diagram showing the vicinity of a die height adjusting mechanism of the press machine of FIG.

FIG. 4 is a block diagram illustrating a control system of the press machine in FIG.

FIG. 5 is a block diagram illustrating the function of the controller of FIG.

FIG. 6 is a functional block diagram of an ID card provided in association with a mold attached to and used in the press machine of FIG.

7 is a diagram showing a state in which a load measuring device is arranged in the press machine of FIG.

8 is a diagram showing an example of a load waveform obtained by the load measurement of FIG.

9 is a diagram showing the relationship between the wrinkle pressing load Fsi and the air pressure Pa obtained by the load measurement of FIG.

10 is a diagram showing a relationship between a press load Fpi and a relative distance h of the press machine shown in FIG.

11 is a flowchart for specifically explaining the function of the relative distance h adjustment block in FIG.

FIG. 12 is a flowchart illustrating the contents of step R2 of FIG. 11.

FIG. 13 is a view showing a display operation panel provided in another embodiment of the present invention.

FIG. 14 is a flowchart illustrating an operation when adjusting the hydraulic pressure Ps in a press machine including the display operation panel of FIG. 13.

FIG. 15 is a flowchart illustrating the contents of step S4 of FIG.

16 is a diagram illustrating a detection position of a generated hydraulic pressure PX _n read in step S4-7 of FIG.

17 is a diagram showing an example of a generated hydraulic pressure PX _n detected when setting the equalized initial hydraulic pressure P ₀ according to the flowchart of FIG. 15 in relation to the equalized initial hydraulic pressure P _n .

FIG. 18 is a flow chart for explaining an operation when data is exchanged with an ID card in a press machine equipped with the display operation panel of FIG. 13.

FIG. 19 is a view showing a display operation panel provided in still another embodiment of the present invention together with FIG. 20 and FIG. 21.

20 is a diagram showing the display operation panel together with FIG. 19 and FIG. 21.

FIG. 21 is a view showing the display operation panel together with FIG. 19 and FIG. 20.

FIG. 22 is a flowchart illustrating a procedure for initial adjustment of the relative distance h in the press machine including the display operation panel of FIGS. 19 to 21.

FIG. 23 is a view illustrating a sequel to the flowchart in FIG. 22;

FIG. 24 is a diagram for explaining the relationship between the pushing amount and the press load Fp when the relative distance h is adjusted according to FIGS. 22 and 23.

FIG. 25 is a flowchart illustrating a procedure for reproducing the relative distance h in a press machine including the display operation panel of FIGS. 19 to 21.

[Explanation of symbols]

 10: Press machine 90: Controller 94: Transceiver (input means) 96: ID card (input means) 128: Pressing condition data memory (storage means) 146: Relative distance h adjustment block 182: Changeover switch (input means) h : Relative distance (pressing condition) Ps: Hydraulic pressure (pressing condition) Steps R2 to R4, R6: Adjustment process Step R5: Storage process Steps R7, R8: Reproduction process Step S4: Adjustment process Steps SS1, SS2: Storage process step S5, S6: Reproduction process Steps Q6 to Q26: Adjustment process Steps Q33 to Q35: Storage process Steps W5 to W8: Reproduction process Steps R2 to R4, R6: Adjustment means Steps R7 and R8: Reproduction means Step S4: Adjustment means Step S5 , S6: Reproduction means

Claims (2)

[Claims] 1. A press machine in which a pair of removably attached molds are moved closer to and separated from each other for press working, and the press working conditions that affect the press working can be adjusted according to the molds used. A method of setting the press working conditions, comprising an adjusting step of adjusting the press working conditions for each mold so as to obtain an appropriate pressed product, and the press working conditions adjusted in the adjusting step,
A storing step of storing in a storage means in relation to the press machine and the die, and a reproducing step of reproducing the press working condition stored in the storage means when the same die is arranged in the same press machine. And a method of setting press working conditions for a press machine. 2. A press machine in which a pair of removably attached molds are moved closer to and separated from each other for press working, and the press working conditions that affect the press working can be adjusted depending on the molds used. An apparatus for setting the press working conditions, comprising input means for inputting mold information predetermined for each mold so as to obtain an appropriate pressed product, and mold information inputted by the input means. Based on the adjusting means for adjusting the press working conditions so as to obtain an appropriate pressed product, and the press working conditions adjusted by the adjusting means,
A storage unit that stores the relationship between the press machine and the mold; and a reproduction unit that reproduces the press processing condition stored in the storage unit when the same mold is arranged in the same press machine. A press processing condition setting device for a press machine, which is characterized in that