JPH04279219A - Process data editing device of bending machine - Google Patents

Abstract

PURPOSE:To provide the process data editing device of a bending machine capable of simple preparation of a correction data table, easy of input operation of a correction data and capable of a simple process editing operation. CONSTITUTION:A bending angle or a correction value table 4 for elongation is set, this correction value table 4 is made up so that it can be retrieved according to the work plate thickness and die V width and a desired correction value is made up so that it is written on the correction value table 4 by giving a write command to a correction value displayed on a process data input screen 1.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process data editing device for a bending machine.

0002

[Prior Art] A bending machine places a plate material (workpiece) between two molds consisting of a punch and a die, and bends the workpiece at an arbitrary angle by moving the two molds relatively close to each other. It is a processing machine, and the control method for both molds is
There are a mold position control method and an angle feedback method.

The former mold position control method moves the mold position to a preset target position. The latter angle feedback method uses an angle detector to detect the bending angle of a workpiece during bending processing, thereby controlling the drive of the mold so that the bending angle becomes a target angle. However, the latter angle feedback method has not yet been put into practical use and is currently in the testing and research stage.

[0004] The former mold position control method is divided into two types: one is to directly detect the mold movement and control the positioning of the mold, and the other is to servo position a movable body arranged parallel to the direction of mold movement. There are two types: the upper limit valve method, which restricts the mold movement according to the position of the body. The method for regulating mold movement is called the upper limit valve method.In general bending machines, a lower table with a die on the upper part is hydraulically driven up and down, and a valve (
This is because oil drainage is adjusted at the position of the moving body which is servo-positioned.

These mold position control type bending machines perform bending by estimating that the workpiece will be bent at a predetermined angle by controlling the mold position. In order to set the mold position, it was necessary to perform many trial bends. Since the relationship between the angle and the die position differs depending on the workpiece material, plate thickness, die width, and die width in particular, it is a difficult task to perform trial bending every time these conditions change. Furthermore, since the flange length must be determined taking into account the elongation of the workpiece, trial bending is also required for this purpose.

In order to minimize the number of test bends, the mold control position is automatically calculated according to the material, plate thickness, and mold shape, and a flange length setting device (backgauge device) is used according to the elongation. ) is also being automatically calculated.

However, even with this control position automatic calculation method, it is difficult to determine a reliable mold control position, and it is necessary to provide a certain degree of correction. In particular, with the upper limit valve method mentioned above, the lower table is balanced by adjusting the oil discharge of the hydraulic valve, so the amount of oil discharge adjustment varies depending on the temperature and pressurizing force, and small corrections are inevitably required. Become.

[0008] Conventionally, in order to input data for this correction, a correction data table created according to the material, plate thickness, and mold shape is called up, and a part of it is manually updated or updated one by one. Additional corrections are being made.

[0009]

[Problem to be Solved by the Invention] However, the conventional method of inputting correction data is to create a correction data table for material, plate thickness, and mold shape, call up the correction table, and manually input some of the data. Since the method was such that updates or additions were made one by one through operations, a correction table was required for each mold, and process editing and correction data input operations were required separately, making the process not only cumbersome but also difficult to understand. The problem was that it was complicated.

SUMMARY OF THE INVENTION Accordingly, the present invention provides a process data editing device for a bending machine that can easily create a correction data table, easily input correction data, and easily perform process editing operations. The purpose is to

[0011]

[Means for Solving the Problems] The present invention for solving the above problems, as shown in outline in FIG. It includes a process data input unit 2 that inputs data while displaying it on a data input screen 1, and a control data calculation unit 3 that calculates control data to control each axis of the bending machine according to the input process data. In the process data editing device of the folding machine, a correction value table 4 is created that stores angle or elongation correction values according to workpiece thickness and die V width for each material, and the correction value table 4 is sorted in ascending order. a correction value sorting processing unit 5; a correction value search unit 6 that searches for angle and elongation correction values according to the input set material, plate thickness, and die V width; and the material input in the correction value table 4; plate thickness,
If there is no data corresponding to the die V width, obtain the required data by interpolation, and add the angle and elongation correction values searched by the correction value search unit 6 to the data input by the process data input unit 2. , a correction value for the angle or elongation is input in the data inputted by the input data correction unit provided to the control data calculation unit 3 and the process data input unit, and a write command is issued from the correction value write command unit 8. The present invention is characterized by comprising a correction value writing section 9 for writing a correction value for the angle or elongation displayed on the process data input screen 1 into the correction value table 4 when there is a correction value.

0012

[Function] According to the process data editing device for a bending machine of the present invention, the bending angle and elongation correction value data are determined as correction value data for directly or indirectly correcting the created control data. The correction is intuitive and easy to understand because it recognizes the angle rather than correcting the amount of mold movement. In addition, since these correction value data are stored in a correction value table according to the plate thickness and die V width for each material,
There is no need to define a correction value table for each mold, and all molds can be handled continuously, and for molds for which correction value data has not been input (die V width), the data of the molds at both ends is displayed. can be found by interpolating.

Furthermore, by inputting correction data for angle and elongation into the process data input screen 1 and giving a correction value write command, the correction values can be easily written into the correction value table 5. Easy to operate. Furthermore, this eliminates the need to switch screens during editing of each process, thereby simplifying process editing.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

First, the structure of a press brake as an example of a bending machine is shown. In FIG. 2, a press brake 10 is provided with a side frame 11 having a C-shape when viewed from the side.

A fixed table 12 is fixed above and in front of the side frame 11, and a punch 13 is fixed below the fixed table 12.
is fixed.

On the other hand, a lower table 14 is provided in front and below the side frame 11 and is movable up and down.
A die 15 is fixed above the table 14 so as to face the punch 13.

The lower table 14 is connected to the hydraulic cylinder 1
6 to be driven up and down. An oil pipe 17 for supplying pressure oil to the cylinder 16 is connected to this hydraulic cylinder 16, and this pipe 17 is connected to the motor M.
It is connected to a hydraulic pump P driven by. Therefore,
Supplying pressure oil to the piping 17 by driving the hydraulic pump P,
The lower table 14 can be moved up and down by operating the hydraulic cylinder 16. In other words, by driving the die 15 up and down, the workpiece W interposed between the punch 13 and the die 15 can be bent.

In order to position and control the lower table 14 at an arbitrary position, a dog 18 is fixed to the back side of the lower table 14, and the dog 18 is detected and the table 14 is controlled.
An upper limit valve device 19 is provided for regulating the rising end of.

The upper limit valve device 19 includes an upper limit valve 21 for discharging the pressure oil from the pipe 17 into a tank 20, and a valve operating device for operating this valve 21. This valve operating device includes a servo motor 22 and a swing plate 23 that is adjusted and moved back and forth by the motor 22.
The swing plate 23 has a chamfered portion at the lower front end thereof, and is normally in a horizontal position and is adjusted back and forth by the servo motor 22, so that the height of contact with the dowel 18 can be freely adjusted. It is said that Also, due to contact with the dog 18, its front end position is lifted and its rear end is lowered,
This downward movement of the rear end actuates the upper limit valve 21, drains the oil in the pipe 17 into the tank 20, and restricts the lower table 14 from rising. Therefore, by adjusting and driving the servo motor 22, the height of contact with the dog 18 is adjusted, and the rising ends of the lower table 14 and the die 15 are regulated.
The bending angle of the work W can be finely adjusted. To determine the lower limit position, a limit switch LS (not shown) is provided that contacts the dog 18 at an appropriate height. There is also a type that can control the vertical positioning of the swing plate 23.

In order to determine the flange length of the work W, a back gauge device 24 is provided behind the punch 13 and die 15.

The back gauge device 24 includes a ball screw 25 that extends back and forth, and a servo motor 26 that rotationally drives the ball screw 25.
A nut member 27 is screwed onto the ball screw 25, and a stopper 29 is attached to the upper part of the nut member 27 via a vertically moving member 28 so as to be vertically adjustable. Therefore, it is adjusted back and forth by the servo motor 26,
By abutting the workpiece end against the tip of the stopper 29 whose height is adjusted appropriately, the flange length for bending can be determined by the distance determined between the stopper tip and the die V groove position. The workpiece supply service may be performed manually or automatically using a dedicated robot.

FIG. 3 is a block diagram showing the configuration of a control device (CNC device) for the press brake 10. As shown in FIG. This CNC device is integrated with a process data editing device that automatically creates control data for each process.

The CNC device 30 includes a status monitoring section 31, a data input processing section 32, a display processing section 33, a personal computer communication processing section 34, an IC card communication processing section 35, a data storage section 36, and an internal communication Processing section 37 and intermediate processing section 38
It consists of connecting.

The status monitoring unit 31 includes a data management processing unit 39
is built-in. An MDI panel 40 is connected to the data input processing section 32 for inputting data to the CNC device. A color CRT 41 is connected to the display processing section 33. The personal computer communication processing section 34 includes the personal computer 4.
2 can be connected. IC card communication processing section 35
An IC card 43 can be attached to the . The data storage unit 36 stores mold data and correction value data in addition to NC data and parameters. The intermediate processing section 38 is connected to the calculation processing section 44 and performs calculation preprocessing, data conversion, and sorting processing. The communication processing section 37 is connected to an axis control module 45 that controls the servo motors 22 and 26 described above.

In the CNC device 30 having the above configuration, the CR
When control data for each process is generated by the operation of the data management processing section 39, intermediate processing section 38, and calculation processing section 44 based on the process data input from the MDI panel 40 with reference to the display of T41, the state monitoring Under the supervision of Department 31,
Axis control data is timely transmitted to the axis control module 45 via the communication processing unit 37, the servo motors 22 and 26 are automatically controlled, and the workpiece W is bent at a predetermined angle.

At this time, in the MDI panel 40, the material,
In addition to the plate thickness and the V width of the die 15, the flange length and
Data corresponding to the product shape, such as bending length and bending angle, is input, and the calculation processing section 44 refers to the angle and elongation correction value table data in the data storage section 36, and uses the corrected contents to control the servo motor 22. , 26 control target values are determined.

The personal computer 42 is used to assist in processing image data displayed on the CRT 41. It can also be used to refer to auxiliary data when editing process data. As an aid to image data, it is useful when displaying each process diagram of the workpiece W in three dimensions. Thereby, the load on the CNC device 30 itself can be reduced.

The IC card 43 is used, for example, to store edited data. In this case, the edited data for each product of the edited data can be stored in the IC card 43, so by setting the IC card 43 according to the product you want to process, you can use the CRT without having to edit the process data from scratch.
41, process data can be displayed. In this case, the operator only has to change the correction value as necessary. Whether or not to store the correction value in the IC card 43 will be described later.

As shown in FIG. 4, the punch 13 and die 1
5 defines mold specific items such as punch height, punch angle, punch tip R, die height, die width, die V width, die shoulder R, and die depth (not shown), as shown in FIG. Mold data table 36A along with punch pressure resistance value and die resistance pressure value.
is memorized. This table 36A is formed as a part of the data storage section 36. The mold data table 36A can be stored by the machine manufacturer at least for standard molds.

Next, a specific example of the process data editing method will be described. To edit the process data, display the workpiece information input screen 41A shown in FIG. 6, input the workpiece information and mold data, then display the process input screen 41B shown in FIG.
This is done by inputting the required data.

On the workpiece information input screen 41A shown in FIG. 6, after entering the workpiece name, plate thickness, material, tensile strength, and set number of sheets, and entering the punch number and die number, the mold data table 36A shown in FIG. 5 is searched. Then, each item data shown in FIG. 4 is automatically set and displayed.

Next, when the input of work information etc. is completed,
A process input screen 41B as shown in FIG. 7 is displayed. "Clear", "Auxiliary Data", "Input Complete", "Work Information", and "Data 1 Column" shown separately at the bottom of the screen 41B are soft keys for instructing each function.

In the figure, on the screen 41B, Process 2 is displayed under the work name, and the flange length, bending length, bending angle, bending, etc. (FR bending inner R) are data input for the second bending process. has been done. The meanings of the data input items β, α, β', etc. shown below are as follows.

β Correction value of bending angle for all processes (
α Elongation for all processes (mm) β′ Bending angle correction value for each process (degrees) Z Stopper adjustment height (mm) α′ Elongation correction value for each process (mm) LS Multi lower limit (mm) YR Right side stopper lateral position (mm) YL Left side stopper lateral position (mm) L1 Relative movement amount of one side L axis with respect to other L axis (mm) L' Retraction amount of pullback D Back gauge device (D axis) Control position (mm) L
Upper limit valve device (L axis) control position (mm) PLB
D-axis correction amount (mm) during playback for each process If numerical values are entered in the β and α items, but not in the β' and α' items, the values of β and α for all processes is assigned. When the values of β' and α' are input for each process, the values of β' and α' are substituted for that process. PLB is
This is the D-axis correction amount for each process during playback. L' indicates the amount of pullback for each process, and when a numerical value is set to this, after the workpiece W comes into contact with the stopper 29, the stopper 29 is moved back by the specified amount.

FIG. 8 is an explanatory diagram showing a method of registering correction value data in the data storage section 36.

When the "HELP" key is pressed in step 801 and the cursor is moved to the correction values β' and α' in step 802, the correction value data β', α' for material, plate thickness, die V width, and bending angle are displayed in step 803. α' is read, and in steps 804 to 808, the corresponding item in the correction value table 36A of FIG. 9(a) is searched, and in step 809, correction value data is registered there.

FIG. 9 shows a correction value table 36 for angles.
(a) shows the state after correction value registration, and (b) shows the state after sorting processing. As shown in (a),
In this example, by operating the "HELP" key in the state shown in FIG. 7, the numerical value "1.3 (degrees)" is registered in the column corresponding to a plate thickness of 1.0 and a bending angle of 90 degrees.

Therefore, when inputting the process data is completed while arbitrarily registering the correction values β' and α',
The data management processing unit 39 and the calculation processing unit 44 determine the control amounts Dc and Lc of the D-axis and L-axis for each process using the following equations while referring to the correction value table as shown in FIG.

Dc =f(A), A=A0 +β(β')Lc =f
(L)+α(α') f is a function of angle A, A0 is the desired bending angle, and f(L) is the flange length not taking into account elongation as indicated in the drawing. show. That is, in this example,
The D-axis is determined as a function of angle, and the operator is made to recognize the deviation angle β (β'). Furthermore, the elongation α (α′) is directly searched from the correction value table. Values not found in the table may be found by interpolation.

However, in order to interpolate and obtain data that does not exist in the table, it is necessary that the data in the correction value table 36B be arranged in ascending order. Therefore, in this example, when it becomes necessary to interpolate interpolated data,
), if the data in the correction table 36B is not arranged in ascending order, the data is sorted so that it is arranged in ascending order as shown in FIG. 9(b). Therefore, in this example, since the data in the correction table is arranged in ascending order,
If the required data is not available, it can be obtained by interpolation from the data at both ends. For example, plate thickness 1.00, die V
For a width of 5 mm and a bending angle of 45°, the bending angle is 30.
1.50 is calculated as the intermediate value between 00 and 60.00. The same applies to elongation.

In FIG. 10, it is determined in step 1001 whether sorting is complete, and if it is not completed, the correction value table 36A is sorted in step 1002, correction value data is searched in step 1003, and control data is calculated in step 1004. I ask.

The control amount Dc obtained as above,
Lc is stored as a value for each process on the NC data,
Under the control of the condition monitoring section 31, the information is sent to the axis control module 45 via the communication processing section 37, and the upper limit valve device 19,
The back gauge device 24 is controlled.

The created NC data is transferred to and stored in the IC card 43, managed for each product, and can be used again. The process data shown in FIG. 4 may be stored in the IC card 43. In this case, calculation processing unit 4
4 requires recalculating the NC data each time the IC card 43 is inserted, but this can be processed in a short time.
This is convenient because you can work while checking the process input status on the screen 41B.

[0045] Furthermore, the data storage section 36 is stored in the IC card 43.
By storing the contents of , it is possible to create a CNC device with a correction value learning function based on the IC card 43, and it is possible to flexibly handle various bending operations.

[0046] If IC cards are classified by material and board thickness, multiple cards can be installed, dubbing is possible as appropriate, and each machine is appropriately offset to ensure compatibility. It can be used as a database to manage the entire factory.

Furthermore, the correction data can be made into a database with a more advanced learning function by not only simply registering the data but also by allowing data for multiple times to be input and using the average value of those values. It is something.

The present invention is not limited to the above-mentioned embodiments, but can be implemented in any suitable manner by making appropriate design changes.

[0049]

As described above, since the present invention is a process data editing device for a bending machine as described in the claims, it can be used as correction value data for directly or indirectly correcting the created control data. Since the correction value data for the bending angle and elongation are determined, the correction of the bending angle in particular is intuitive and easy to understand because the angle is used instead of correcting the amount of mold movement. In addition, these correction value data can be used to determine plate thickness and
Since the correction value table is stored in accordance with the die V width, there is no need to define a correction value table for each mold, and all molds can be handled continuously. The width of the die (V width) can be determined by interpolating the data of the molds at both ends thereof.

In addition, by inputting the angle and elongation correction data into the process data input screen 1 and giving a correction value write command, the correction values can be easily written into the correction value table 5. This eliminates the need to switch screens during editing of each process, which simplifies process editing.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a process data editing device showing an outline of the present invention.

FIG. 2 is an explanatory side view showing an example of a bending machine implementing the present invention.

[Figure 3] Control device (CNC device) of the bending machine in Figure 2
block diagram.

FIG. 4 is an explanatory diagram showing input items of mold data.

FIG. 5 is an explanatory diagram of a mold data table.

FIG. 6 is an explanatory diagram of a work information input screen.

FIG. 7 is an explanatory diagram of a process input screen.

FIG. 8 is a flowchart showing a correction value registration method.

FIG. 9 is an explanatory diagram showing a correction value registration method and a sorting processing method.

FIG. 10 is a flowchart showing a control data calculation method.

[Explanation of symbols]

1　Process data input screen 2 Process data input section 3 Control data calculation section 4 Correction value table 5 Correction value sorting processing section 6 Correction value search section 7 Input data correction section 8 Correction value writing command section 9 Correction value writing section 19 Upper limit valve device 24 Back gauge device

Claims (1)

[Claims] Claim 1: A process data input section that inputs process data such as flange length, bending length, and bending angle for each bending process while displaying the data on a process data input screen, and a process data input section that inputs process data such as flange length, bending length, and bending angle for each bending process, and In a process data editing device for a bending machine, which is equipped with a control data calculation unit that calculates control data to control each axis of the bending machine, the angle or elongation is calculated for each material according to the workpiece plate thickness and die V width. a correction value table that stores correction values; a correction value sorting processing unit that sorts the correction value table in ascending order; and input and set materials;
A correction value search unit that searches for correction values for angle and elongation according to the plate thickness and die V width, and a correction value search unit that searches for angle and elongation correction values according to the plate thickness and die V width, and a correction value search unit that is necessary when there is no data corresponding to the material, plate thickness, and die V width input in the correction value table. an input data correction unit that calculates the data by interpolation, adds the angle and elongation correction values searched by the correction value search unit to the data input by the process data input unit, and provides the result to the control data calculation unit; If a correction value is input for the angle or elongation in the data input in the process data input section, and a write command is received from the correction value write command section, the angle displayed on the process data input screen A process data editing device for a bending machine, comprising: a correction value writing section that writes a correction value for elongation into the correction value table.