JP3268908B2 - Bending method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of calculating or detecting a wear amount of a mold when a workpiece is bent, and a method of forming a punch with a punch based on the calculated or detected wear amount of the mold. The present invention relates to a bending method and a device for correcting a relative distance to a die (hereinafter, referred to as D-axis correction).

[0002]

2. Description of the Related Art Heretofore, a bending process has been performed on a work by a punch and a die in cooperation with a punch, for example, using a press brake as a bending apparatus. As the work is bent in cooperation with the punch and the die, the tip of the punch wears. Due to the abrasion of the tip of the punch, the punch may not reach the predetermined D value (the amount of punch and protrusion) calculated by the NC device in the control device.

[0003]

By the way, the fact that the punch does not reach the predetermined D value in the above-mentioned prior art is as follows.
This means that the punch is positioned at a position separated from the die by a wear amount less than a predetermined D value. For this reason, there is a problem that the bending angle of the work becomes sweet. That is, the accuracy deteriorates as in the bending.

SUMMARY OF THE INVENTION An object of the present invention is to improve the above-described problems by detecting the amount of punch wear when bending a work and performing D-axis based on the detected amount of wear. It is an object of the present invention to provide a bending method and a device for performing a bending process to improve the accuracy of a bending angle by performing correction.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method of bending a workpiece by bending a workpiece in cooperation with a punch and a die. The pressing position and the pressing force are calculated from the position data, or the pressing position and the pressing force are detected by the pressure sensor provided on the intermediate plate, and the calculated or detected pressing force and the pressing force / wear amount data are determined in advance. A wear amount per unit length and a wear position are obtained based on the pressing force / wear amount data stored in the table, and the obtained wear amount per unit and the wear position are written by a writing means into a punch or control device. The bending method is characterized in that the information is stored in a storage means provided in the storage device.

In the bending method, the relative distance between the punch and the die is corrected on the basis of the wear amount per unit and the wear position stored in the punch or the storage means provided in the control device. It is assumed that.

Further, the present invention provides a bending device for bending a work in cooperation with a punch and a die under the control of a control device, wherein a pressure is provided on an intermediate plate for holding the punch on an upper table. A sensor, storage means provided on the punch for storing the amount of wear of the punch, writable and readable write / read means provided at a position of the intermediate plate facing the storage means,
A bending device is provided with a pressing force / wear amount data table provided in the control device and storing a relationship between the pressing force and the mold wear amount.

According to the present invention, there is provided a bending apparatus for bending a work in cooperation with a punch and a die under the control of a control apparatus. Detecting means for detecting pressure; storage means provided in the control device for storing the amount of wear of the punch; and pressing force / wear provided in the control means and storing the relationship between the pressing force and the die wear amount. And the quantity data, to constitute a bending apparatus.

[0009] The bending apparatus is characterized in that it comprises a correction means provided in the control device for correcting the relative distance between the punch and the die.

[0010]

By adopting the bending method and the apparatus according to the present invention, the bending length and the bending position data inputted beforehand when the work is bent by the cooperation of the punch and the die. Alternatively, the pressing position and the pressing force are calculated or detected by a pressure sensor provided on the intermediate plate. The wear amount and wear position per unit length are obtained based on the calculated or detected pressure and the pressure / wear data stored in advance in the pressure / wear data table of the control device. The determined wear amount and wear position are stored by the writing means in a punch or a storage means provided in the control device.

The relative distance between the punch and the die, that is, the D-axis, is corrected based on the wear amount and the wear position stored in the storage means. Thus, the accuracy of the bending angle of the bent work is improved.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings.

Referring to FIG. 6, for example, a press brake 1 as a bending apparatus is constituted by a C-shaped side frame 5 erected from a bottom plate 3 on both sides.
An upper table 7 for connecting the side frames 5 is fixedly provided on the upper front side of the side frame 5, and a punch P is attached to a lower end of the upper table 7 via a plurality of intermediate plates 9. .

At a lower position corresponding to the upper table 7, there is provided a lower table 13 which can be moved up and down by operating a fluid pressure cylinder 11 attached to a lower front portion of the side frame 5. Lower table 1
A die D is attached to the upper end of 3 via a die holder 15.

The side frame 5 is formed in a C-shape. The work W or a product obtained by bending the work W is carried into the side frame 5 in a bending line direction (longitudinal direction of the press brake 1). A gap portion 17 is provided because it needs to be extended. The gap portion 17 is provided with a back gauge 19 that is movable in the front-rear direction (the left-right direction in FIG. 6) for positioning the bending line of the work W when the work W is inserted from the front.

With the above configuration, the workpiece W is placed on the die D, the back gauge 19 is moved in the front-rear direction to position the bending line of the workpiece W, and one end of the workpiece W is positioned on the back gauge 19. Hit. Next, when the fluid pressure cylinder 11 is operated to move the lower table 13 up and down, the work W is bent at a predetermined angle by the cooperation of the punch P and the die D.

For example, as shown in FIG. 2, a punch P is detachably attached to a lower portion of the intermediate plate 9 by a clamp 21. A pressure sensor 23 such as a piezo sensor is provided at a lower portion of the intermediate plate 9 so that a pressing force when the punch P is pressed can be detected. Also,
On the upper right side of the punch P, there is provided a storage means 25 such as a writable ID chip for storing the amount of wear when the tip of the punch P is worn. At the position of the intermediate plate 9 facing the storage means 25, a writing / reading means 27 such as an antenna is provided. The writing / reading unit 27 may be configured such that the writing unit and the reading unit are separately and independently provided.

As an example of the control device 29 for controlling the press brake 1, as shown in FIG.
The pressing position detected by the pressure sensor 23, the pressing position for storing the pressing force, the pressing force memory 31, and the pressing force / wear amount table 3 in which the relationship between the pressing force and the wear amount is indicated in advance.
3, the press position and the press force at each press position stored in the press force memory 31, and the press force / wear amount stored in the press force / wear amount table 33, and the unit length. Processing means 35 for processing the wear position and the wear amount per contact
And D-axis correcting means 37 for correcting the D-axis.

Further, an input device 39 such as a keyboard for inputting various data, a display device 41 including a CRT or the like for displaying various data, or an automatic intermediate device for automatically correcting the intermediate plate 9 is provided in the control device 29. The plate driving device 43 is connected.

The operation of the above configuration will be described with reference to the flowchart shown in FIG.
, The pressure location is detected by the pressure sensor 23 provided on the intermediate plate 9. In step S2, the pressurizing force at each location is detected by the pressure sensor 23 and stored in the pressurizing device and the pressurizing force memory 31 together with the above-mentioned pressure location.

In step S3, the control unit 29 stores the relationship between the pressing force and the wear amount stored in the pressing force / wear amount table 33 in advance, the pressing position, the pressing position stored in the pressing force memory 31, and the pressing force. Are taken into the processing means 35 to determine the wear position and the wear amount per unit length. Step S4
Thus, the pressure location in each mold is determined. Step S
In step 5, based on the wear position and the wear amount per unit length obtained in step S4, the total wear position is stored in the storage means 25 provided on the punch P by the writing / reading means 27 provided on the intermediate plate 9. , The wear amount is written and stored.

In step S6, the total wear position and the amount of wear stored in the storage means 25 are read by the writing / reading means 27 and taken into the D-axis correction means 37.
The D-axis correction means 37 calculates a D-axis correction value. In step S7, the D-axis correction is performed by driving the automatic intermediate plate driving device 43 based on the D-axis correction value.
After the bending process is performed in step S8, in step S9, the wear data of the wear position and the wear amount is calculated based on the flow of steps S1 to S5.

FIG. 4 shows an alternative embodiment to FIG. 4, the same components as those in FIG. 1 are denoted by the same reference numerals, and only different configurations will be described. That is, in FIG. 1, the pressure sensor 23 detects the pressurized position and the pressurized force. A pressing position, a pressing position for detecting a pressing force, and a pressing force detecting means 45 are provided. The storage means 25,
Instead of the writing / reading means 27, in the present embodiment, a storage means 47 for storing the total wear position and the wear amount is provided in the control device 29. The other configuration is almost the same, and the description is omitted.

The operation of the above configuration will be described with reference to the flowchart shown in FIG.
At 0, the pressure position in the control device 29 and the pressure location are detected by the pressing force detection means 45 based on the bending length and bending position data previously input. In step S11, the pressing position,
The pressurizing force at each location is detected by the pressurizing force detecting means 45 and is stored in the pressurizing position and pressurizing force memory 31 together with the above-mentioned pressure location.

In step S12, the controller 29 stores the relationship between the applied pressure and the wear amount stored in the applied pressure / wear amount table 33 in advance, the applied position, the applied position stored in the applied pressure memory 31, and the applied pressure. Are taken into the processing means 35 to determine the wear position and the wear amount per unit length. Step S1
At 3 the pressure location in each mold is determined. Step S
At 14, the total wear position and wear amount are written and stored in the storage means 47 provided in the control device 25 based on the wear position and wear amount per unit length obtained in step S13.

In step S15, the total wear position and the wear amount stored in the storage means 47 are read by a separately provided reading means, and are taken into the D-axis correction means 37. The D-axis correction means 37 calculates a D-axis correction value. In step S16, the D-axis correction is performed by driving the automatic intermediate plate driving device 43 based on the D-axis correction value. After bending is performed in step S17, step S18 is performed.
Then, the wear data of the wear position and the wear amount is calculated based on the flow of steps S10 to S14.

When the work W is bent as described above, the wear position and the wear amount of the punch P can be easily detected. By automatically performing D-axis correction based on the detected wear position and wear amount, it is possible to improve the accuracy of the bending angle.

When the D-axis correction data is obtained by the D-axis correction means 37 and is performed by the automatic intermediate plate driving device 43, for example, the movable wedge of each intermediate plate 9 is movable by the D-axis correction data. The wedge can be moved by a cylinder or the like. Since the specific configuration of the automatic intermediate plate driving device 43 is already known, a detailed description thereof will be omitted.

When the operator performs the D-axis correction, the D-axis correction data is displayed on the CRT of the display device 41, and the D-axis is corrected by adjusting each intermediate plate 9 according to the display. be able to.

In the flowcharts of FIGS. 3 and 5, when the amount of wear detected in steps S5 and S14 reaches a predetermined value which has a great adverse effect on bending accuracy, an alarm signal is generated in that state. In addition, the operator can be notified of the stop of the bending process and the timing of polishing the punch P.

As an example of performing the polishing of the punches P, for example, an automatic polishing machine is connected to a mold storage in which various punches P are stored, and the abrasion state of the various punches P is monitored to perform automatic polishing as necessary. It can be performed. At this time, steps S5 and S5 in the flowcharts of FIGS.
By transmitting the mold wear data obtained in S14 to an automatic polishing machine, automatic polishing can be performed.

The present invention is not limited to the above-described embodiment, but can be embodied in other modes by making appropriate changes. In this embodiment, an example in which the upper table 7 is fixed and the lower table 13 is moved up and down has been described. However, the present invention is also applicable to a case where the lower table 13 is fixed and the upper table 7 is moved up and down.

[0033]

As will be understood from the above description of the embodiments, according to the present invention, since the structure is as described in the claims, the work is bent. At this time, the wear position and the wear amount of the punch can be easily detected. In addition, by automatically performing the D-axis correction based on the detected wear position and the detected wear amount, the accuracy of the bending angle can be improved.

[Brief description of the drawings]

FIG. 1 is an example of a configuration block according to the present invention.

FIG. 2 is a side view of a state where a punch is attached to a lower portion of an upper table via an intermediate plate.

FIG. 3 is a flowchart illustrating an operation based on the configuration block diagram of FIG. 1;

FIG. 4 is a block diagram showing another configuration instead of FIG. 1;

FIG. 5 is a flowchart illustrating an operation based on the configuration block diagram of FIG. 4;

FIG. 6 is a side view of a press brake according to one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Press brake (bending apparatus) 9 Intermediate plate 11 Fluid pressure cylinder 23 Pressure sensor 25 Storage means 27 Writing / reading means 33 Pressing force / wear amount table 37 D axis correction means 43 Automatic intermediate plate driving device 45 Pressing position, Pressing force detecting means 47 Storage means P Punch D Die W Work

Claims (5)

(57) [Claims] When a workpiece is bent by cooperation of a punch and a die, a pressing position and a pressing force are calculated based on bending length and bending position data input in advance, or an intermediate pressure is calculated. The pressing position and the pressing force are detected by a pressure sensor provided on the plate, and the calculated or detected pressing force and the pressing force / wear amount data stored in advance in the pressing force / wear amount data table are used as a basis. The amount of wear and the wear position per unit length are determined by using a writing means, and the determined amount of wear and the wear position per unit are stored in a punch or a storage means provided in a control device by writing means. Processing method. 2. A relative distance between a punch and a die is corrected based on a wear amount per unit and a wear position stored in a storage means provided in the punch or the control device. The bending method described. And a pressure sensor provided on an intermediate plate for holding the punch on an upper table, wherein the bending device performs a bending process on the work in cooperation with the punch and the die under the control of the control device. Storage means provided on the punch for storing the amount of wear of the punch; writing / reading means capable of writing and reading provided at the position of the intermediate plate facing the storage means; A pressurizing / wear amount data table in which a relationship with a mold wear amount is stored. 4. A bending device for performing a bending process on a work in cooperation with a punch and a die under the control of a control device, wherein a pressing position and a pressing force per unit length are provided in the control device. Detecting means to be detected, storage means provided in the control device for storing the amount of wear of the punch, and pressing force / wear amount data provided in the control means and storing the relationship between the pressing force and the mold wear amount And a bending apparatus. 5. The bending apparatus according to claim 3, further comprising a correction unit provided in the control device for correcting a relative distance between the punch and the die.