JPH11226652A - Plate stock bending method and plate stock bending machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plate stock bending method and a plate stock bending machine capable of executing rapid bending. SOLUTION: When a bending die is transferred from an approach position to a bend position by control of a controller 61 via a positioning unit 71 and bending is finished, the bending die is tramasferred from the bend position to the approach position. In such a case, when the bending die is judged to reach a preliminarily obtained range wherein the bending die is not interfered with an upper plate pressing die while calculating a position of the bending die by an arithmetic comparing part 63, the upper plate pressing die is started to ascend via the positioning unit 71. A path along which the bending die is transferred from the bend position to the approach position is divided, the divided position is calculated, and whether the obtained respective divided positions exist in a range of non-interference is judged by the arithmetic comparing part 63. When the bending die exists outside the ascending path of the upper plate pressing die, the respective divided positions are judged to exist in the range of non-interference by the arithmetic comparing part 63.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet material bending method and a sheet material bending machine for bending a workpiece clamped by upper and lower plate holding dies with a bending die.

[0002]

2. Description of the Related Art A conventional method of bending a work W will be described with reference to FIG.

[0003] First, the work W is positioned at a position to be bent (see FIG. 10A), and the top die 101 is moved along the Z axis.
Is lowered to clamp the work W between itself and the bottom die 103 (see FIG. 10B). The bend beam 105 is positioned at the approach position (see FIG. 10C), and the bend beam 105 is positioned at the bending position and bent (see FIG. 10D). After positioning the bend beam 105 at the approach position (see FIG. 10E), the top die 101 is raised to take out the workpiece W (FIG. 10).
(F)).

Therefore, referring to FIG. 11, the movement of the bend beam 105 is changed from the approach position PA to the bending position PB.
→ approach position PA → end position PC.

[0005]

However, in such a conventional technique, since the operation of the bend beam 105 and the operation of raising the top die 101 are independent at the time of bending, the processing time is short. There is a problem that it becomes longer.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet material bending method and a sheet material bending machine capable of performing a quick bending work, taking the above-mentioned prior art into consideration. .

[0007]

In order to achieve the above object, according to a first aspect of the present invention, there is provided a method for bending a plate material, comprising the steps of: bending a work clamped by upper and lower plate press dies onto a bend beam; In a plate material bending method for performing bending using a mold, a range in which the bending die does not interfere with the upper plate holding die is determined in advance, and the bending die is moved from an approach position to a bending position to perform bending. After the processing is completed, when the bending die reaches the area where the interference does not occur, the upper plate pressing die is started to rise.

Therefore, when the bending die is moved from the approach position to the bending position and the bending process is completed, when the bending die is moved from the bending position to the approach position, the upper plate for which the bending die has been previously determined is required. When it reaches the range that does not interfere with the presser die, the upper plate presser starts to rise.

According to a second aspect of the present invention, there is provided a plate bending machine.
A plate bending machine for bending a workpiece clamped by upper and lower plate holding dies using a bending die mounted on a bend beam, wherein a control device for controlling the plate bending machine comprises: A calculation comparing unit that calculates and calculates a range in which the mold does not interfere with the upper plate holding mold and determines whether the bending mold has reached the range in which the bending mold does not interfere with the bending mold and the upper and lower plates; A positioning unit for instructing the positioning of the presser die, and when the arithmetic and comparator unit determines that the bending die has reached the area where the interference does not occur, the positioning unit starts to raise the upper plate presser die. Instructing the user to do so.

Accordingly, when the bending die is moved from the approach position to the bending position via the positioning unit under the control of the control device and the bending is completed, the bending die is moved from the bending position to the approach position. At this time, if it is determined that the bending die has reached a range that does not interfere with the previously determined upper plate holding die while calculating and calculating the position of the bending die, the upper plate via the positioning unit is determined. Start raising the presser die.

According to a third aspect of the present invention, there is provided a plate bending machine.
3. The sheet bending machine according to claim 2, wherein the calculation die moves from the bending position to the approach position when determining whether or not the bending die is in the range where the bending die does not interfere. The route is divided, and it is determined whether or not each of the divided positions is in the range where the interference does not occur.

Therefore, the operation comparing section divides a path along which the bending mold moves from the bending position to the approach position, calculates each of the divided positions, and determines whether each of the obtained divided positions is in a range where there is no interference. to decide.

According to a fourth aspect of the present invention, there is provided a plate bending machine.
3. The plate bending machine according to claim 2, wherein the range in which the interference does not occur is outside a rising path of the upper plate pressing die.

Therefore, when the bending die is outside the ascending path of the upper plate pressing die, the operation comparing section determines that the bending die is in a range where no interference occurs.

[0015]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 9 shows a plate bending machine 1. The plate bending machine 1 includes a lower frame 3 that supports the whole, and a front plate 5 is provided at a front portion (right side in FIG. 9) of the lower frame 3. At the upper end of the front plate 5, a bottom die 7 serving as a lower plate pressing die is provided.

Above the lower frame 3, there is provided an upper frame 11 which is rotatable in a vertical direction with a hinge pin 9 provided at the rear (left side in FIG. 9) as a fulcrum. At the front of the upper frame 11, a plate holding plate 13 is integrally provided. At the lower end of the plate holding plate 13, a top die 15 which is an upper plate holding die facing the bottom die 7 is provided. Have been.

The upper frame 11 is provided with a Z-axis servomotor 17 as a clamping motor. A drive pulley 19 is mounted on the output shaft of the Z-axis servo motor 17, and a driven pulley 21 is rotatably supported above the plate holding plate 13.
A belt 23 is wound around 1 and the driving pulley 19.

The driven pulley 21 is provided with a crankshaft 25, on which an upper end of a connecting arm 27 having a bow shape is rotatably mounted via a pin 29. A lower end of the connecting arm 27 is attached to the front plate 5 with a pin 31.
It is rotatably mounted via.

When the Z-axis servomotor 17 is driven, the crankshaft 25 is driven via the driving pulley 19, the belt 23, and the driven pulley 21. When the crankshaft 25 is driven, the connecting arm 27 swings with the pin 31 as a fulcrum due to the reaction force. As a result, the upper frame 11 rotates vertically with the hinge pin 9 as a fulcrum, and the top die 15
Moves up and down.

The work W placed on the bottom die 7 is clamped between the bottom die 7 and the top die 15 by lowering the top die 15 in this manner.

A bending die 33 for bending the work W clamped by the bottom die 7 and the top die 15 upward or downward is provided inside the lower frame 3. The bending mold 33 includes an upper bending mold 33U and a lower bending mold 33D. This upper bending mold 33U
And the lower bending mold 33D are attached to the bend beam 35.

An eccentric shaft (AL / AR axis) 39 rotated by an AC servomotor 37 is provided at the rear of the bend beam 35.
Thus, it is rotatably mounted on the front part of the bending frame 41. An eccentric shaft (A-axis) 43 is mounted on the bending frame 41, and a driven pulley is attached to the eccentric shaft 43.

An A-axis servo motor 45, which is a clearance adjusting motor, is mounted on the lower frame 3. A driving pulley 47 is mounted on the output shaft of the AC servo motor 45 for adjusting the clearance. A belt 49 is wound around the driving pulley 47 and the driven pulley.

An upper end of an arm member 51 is attached to a lower portion of the bend beam 35, and a crank shaft (D axis) 53 is rotatably provided at a lower end of the arm member 51. The crankshaft 53 has a gear 5
The gear 55 meshes with a drive gear 59 of a D-axis servomotor 57 which is a bend motor attached to the lower frame 3.

With this configuration, when the AC servo motor 45 for adjusting the clearance is driven,
The eccentric shaft 43 is rotated via the driving pulley 47, the belt 49, and the driven pulley, whereby the bending die frame 41 moves in the left-right direction in FIG.
Alternatively, the clearance with the bottom die 7 is adjusted.

In the AL / AR shaft, the AC servomotor 37 rotates the AL / AR shaft (eccentric shaft) via a speed reducer (not shown), so that the bending die 33 and the top die 15 or the bottom die 7 are connected. Adjust the change between the center and left and right of the clearance.

When the D-axis servomotor 57 is driven, the crankshaft 53 is driven via the drive gear 59 and the gear 55.
Rotates, and the bend beam 35 rotates about the eccentric shaft 39 as a fulcrum. As a result, the workpiece W clamped by the bottom die 7 and the top die 15 is
Forward bending or reverse bending is performed by the 3U or downward bending mold 33D.

Next, FIG. 1 shows the above-described plate bending machine 1.
Is shown in the figure. The control device 61 includes a CPU 62. The CPU 62 is connected to an operation comparison unit 63 including an operation unit 63A and a comparison unit 63B. The CPU 62 includes an operation sequence, positioning, a data generation unit, and the like. is there. The CPU 62 has a display 6 as output means for displaying various information.
5 and input means such as a keyboard 67 for inputting various data. The CPU 62 is connected to a memory 69 for storing a product program, input parameters, calculation results, and the like, and takes data in and out as needed.

Further, a positioning unit 71 for the Z-axis, A-axis and D-axis is connected to the CPU 62.
, The Z-axis servomotor 17, the A-axis servomotor 45, and the D-axis servomotor 57 are controlled via the servo amplifier 73.

Next, a method of bending a sheet material will be described.

The bending by the above-described plate bending machine 1 is performed in the order of the approach position PA → the bending position PB → the approach position PA → the ending position PC as in the related art (see FIG. 11). At
Bend beam 3 from bending position PB to approach position PA
When the bending die 33 moves to a position where the bending die 33 does not interfere with the top die 15, the ascent of the top die 15 is started.

That is, referring to FIG. 2, a hatched portion A indicates a range where the bending die 33 does not interfere with the top die 15 where the bending die 33 rises. If it is within the range, the range where the top die 15 interferes if it rises is shown.

Accordingly, as shown in FIG. 3A, the mold 33 at the bending position PB is moved to the approach position PA.
When the mold 33 moves to the position PD shown in FIG. 3 (B) when returning to the above, there is no interference even if the top die 15 starts to rise. Therefore, when the mold 33 reaches the position PD, the top die 15 starts to rise.

The position PD which does not interfere with the bending die 33 even when the top die 15 is raised is determined as follows. That is, referring to FIG.
When positioning from the approach position PA to the approach position PA, how many pulses before the approach position PA reaches the position PD where the top die 15 and the bending mold 33 do not interfere with each other is determined as follows. In FIG. 4, the dashed-dotted line with the Y coordinate at the position of YL is a line indicating the limit of the position of the bending mold 33 that does not interfere even if the top die 15 is raised.

Referring to FIG. 5, the path from the bending position PB to the approach position PA is divided (here, quadrant), where α is the number of pulses to the approach position PA and β is the number of pulses to the bending position PB. ) To calculate the number of pulses γ
3A (step S1), the number of pulses δ at a position shifted from the bending position PB by γ toward the approach position PA is calculated by the calculation unit 63A (step S2). The Y coordinate Y of the bending mold 33 corresponding to this δ is obtained by the calculation unit 63A (step S3). The comparing unit 63B determines whether or not this Y is smaller than the position of the dashed line (Y coordinate = YL) shown in FIG. 4 (step S4). / 4 approach position PA
Side (step S5), returning to step S3 and repeating. On the other hand, when Y becomes smaller than YL, the pulse E at that position is obtained (step S6).

When the position PD which does not interfere with the bending mold 33 even when the top die 15 is raised is obtained in this way, the position PD is set to the parameter of the positioning unit, and the ascending of the top die 15 is started based on this. To

From the above results, in the bending process, the top die 15 can be raised at the same time as the bend beam 35 on which the bending die 33 is mounted is moved. Along with this, the bending time can be reduced as shown in FIG. Here, FIG. 6B shows a conventional bending time.

The present invention is not limited to the above-described embodiment, but can be embodied in other modes by making appropriate changes. That is, besides the method shown in FIG. 4 described above, for example, the bending die 33 is shown in FIG. 7 as a method of obtaining the limit position where the top die 15 does not interfere with the bending die 33 even when the top die 15 is raised. The position at which the user is in the position may be set as the limit position. Alternatively, as shown in FIG. 8, the limit position may be obtained from a range where the bending die 33 and the top die 15 do not interfere (a hatched area in FIG. 8).

As the bending operation sequence, in addition to the sequence shown in FIG. 11 described above, for example, after bending, the bending die 33 is stopped at a position where it does not interfere even if the top die 15 rises. After moving up, the bending mold 33 can be moved.

[0041]

As described above, in the plate material bending method according to the first aspect of the present invention, when the bending die is moved from the approach position to the bending position and the bending is completed, the bending die is approached from the bending position. When moving to a position,
When the bending die reaches the range that does not interfere with the required upper plate press die, the upper plate press die starts to rise, so the upper plate press die can be moved at the same time as the bending die. In addition, the processing time can be reduced.

In the plate bending machine according to the second aspect of the present invention, the bending die is moved from the approach position to the bending position via the positioning unit under the control of the control device, and when the bending is completed, the bending die is moved to the bending position. To the approach position. At this time, when it is determined that the bending mold has reached a range that does not interfere with the previously determined upper plate holding mold while the calculation comparing unit calculates the position of the bending mold,
Since the ascent of the upper plate pressing die is started via the positioning unit, the upper plate pressing die can be moved at the same time as the bending die, and the processing time can be reduced.

In the plate bending machine according to the third aspect of the present invention, the operation comparing section divides a path along which the bending mold moves from the bending position to the approach position and calculates each of the divided positions.
Since it is determined whether or not each of the obtained division positions is in a range where no interference occurs, it is possible to surely prevent the bending die and the upper plate pressing die from moving simultaneously and move them at the same time.

In the plate bending machine according to the fourth aspect of the present invention, when the bending die is outside the ascending path of the upper plate pressing die, the operation comparing section determines that the bending die is in the range where no interference occurs, so that it is sure. Interference between the bending die and the upper plate holding die can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a control device of a plate bending machine according to the present invention.

FIG. 2 is an explanatory diagram showing a range in which a bending die and a top die interfere with each other and a range in which the top die does not interfere with each other.

FIGS. 3A and 3B are explanatory views showing movement of a bending die and a top die. FIGS.

FIG. 4 is an explanatory diagram for obtaining a limit position at which a bending die does not interfere with a top die.

FIG. 5 is a flowchart illustrating a process of obtaining a limit position where a bending die does not interfere with a top die.

FIG. 6A is a graph showing the processing time of the processing method according to the present invention, and FIG. 6B is a graph showing the processing time of the conventional processing method.

FIG. 7 is an explanatory diagram showing another method for obtaining a limit position where the bending die does not interfere with the top die.

FIG. 8 is an explanatory view showing still another method for obtaining a limit position where the bending die does not interfere with the top die.

FIG. 9 is a sectional view showing the entire plate bending machine.

10 (A) to 10 (F) are explanatory diagrams showing a conventional bending process.

FIG. 11 is an explanatory view showing movement of a bending mold by a conventional processing method.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 sheet material bending machine 7 bottom die (lower plate presser die) 15 top die (upper plate presser die) 33 bending die 35 bend beam 61 controller 63 calculation unit 71 positioning unit W work PA approach position PB bending position

Claims (4)

[Claims] 1. A sheet material bending method for bending a workpiece clamped by upper and lower plate pressing dies using a bending die mounted on a bend beam, wherein the bending die is previously set to the upper plate pressing member. A range that does not interfere with the mold is determined, and after the bending process is completed by moving the bending mold from the approach position to the bending position, and when the bending mold reaches the non-interfering region, the upper plate pressing mold is removed. Starting the ascending process. 2. A plate bending machine for bending a workpiece clamped by upper and lower plate pressing dies using a bending die mounted on a bend beam, wherein the control is performed to control the plate bending machine. A device for calculating and calculating a range in which the bending die does not interfere with the upper plate holding die and determining whether or not the bending die has reached the range in which the bending die does not interfere; A positioning unit for instructing positioning of a die and upper and lower plate presser dies, and when the arithmetic and comparator unit determines that the bending die has reached the area where the interference does not occur, the positioning unit moves the upper plate presser. A sheet bending machine, wherein a command is issued to start raising the mold. 3. The method according to claim 2, wherein the calculating and comparing unit divides a path along which the bending mold moves from the bending position to the approach position when determining whether the bending mold is in the range where the interference does not occur. The plate bending machine according to claim 2, wherein it is determined whether or not each of the determined positions is within the range where the interference does not occur. 4. The plate material bending machine according to claim 2, wherein the non-interfering range is outside the ascending path of the upper plate presser die.