JPH0677775B2 - Die determination method in NC bending machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention determines a mold actually used by an NC device before actually bending a work a plurality of times by an NC bending machine. Regarding mold determination method.

(Prior Art) Conventionally, in a folding machine such as a press brake, the mold to be actually used has been determined manually by an operator. That is, an operator determines a bending process sequence, draws a pattern on the drawing according to the bending process order, and determines a mold having a mold shape based on the drawing.

(Problems to be Solved by the Invention) As described above, in the die determination by the operator's manual work, the operator is burdened, it takes time to determine the die, and the skill of the operator is required. There was a problem.

An object of the present invention is to provide a die determining method in an NC bending machine capable of automatically determining a die.

[Structure of the Invention] (Means for Solving Problems) In order to solve the above-mentioned conventional problems, in the present invention, before actually bending a workpiece a plurality of times by an NC bending machine, an NC device is used. NC that determines the mold to be actually used
In the mold determination method for the folding machine, a plurality of bending processes are set corresponding to the bending points based on the input final machining shape data, and each corresponding bending point is positioned at a predetermined point. Then, the work before bending and the work after bending in each bending process are combined and displayed, and the work non-existing region in which the work is not located is set based on the predetermined one point, and the predetermined one point is set. To determine the actual mold to be used by searching among many molds that have been registered in advance for a mold that has a shape that can be located in the work-existing area. Is characterized by.

(Operation) In the above configuration, a large number of molds are registered in advance in association with mold information by an appropriate storage unit in the NC device.

Before performing the actual bending process, input the predetermined final machining shape data to the appropriate input section of the NC device, and set a plurality of bending processes corresponding to the bending points based on this final machining shape data. . The work before the bending and the work after the bending in each bending process are combined and displayed under the condition that the corresponding bending points are located at a predetermined point by an appropriate display unit in the NC device. Then, the NC device sets a work non-existing region in which the work is not located on the basis of a predetermined one point during each bending process based on the composite display.

Finally, by the NC device, a mold having a shape that can be located at the above-mentioned predetermined one point and located in this work non-existing region, in other words, a mold that does not interfere with the work in the actual bending process, Search from many molds registered in advance. This makes it possible to determine the mold used for the actual bending process.

(Embodiment) FIG. 1 shows an NC bending machine 1 used in an embodiment of the present invention.
It shows the whole of. The folding machine 1 has an upper apron 3 and a lower apron 5. A punch 7 is fixed to the lower part of the upper apron 3 and a die 9 is fixed to the upper part of the lower apron 5 with a plurality of bolts 11 via mold holding members 13, 13. Further, on the front surface of the lower apron 5, a front cover 17 having a tool base 15 extending in the left-right direction is provided.

The movable NC control panel 19 and the movable foot petal device 21 are used to perform a command to move the lower apron 5 up and down and to control the position of a back gauge described later. Further, the operation panel 19 has an input means so that the shape of the work, mold information, and other necessary information can be input to the NC device.

A back gauge 25 is provided in the work processing space 23 between the upper apron 3 and the lower apron 5 of the folding machine 1 as shown in detail in FIG. The back gauge 25 includes a plurality of supports 27 protruding rearward near the left and right ends of the lower apron 5. The support 27 has a lead screw 31 driven by an electric motor 29.
And a linear motion guide 33 parallel to this.

Lead screw 31 and linear motion guide 33 above
A movable table 35 is provided on the above. This left and right movable stand 35,3
A beam 37 is horizontally passed between the five, and the height can be adjusted by a lifting drive device 39.

The back gauge 25 is attached to the beam 37 so that it can be positioned left and right. And on the front of the back gauge 25,
A butting member 41 is provided.

The height of the abutting member 41 is equal to the height driving device for the beam 37.
Performed by 39.

In performing bending of a work by the above-described bending machine, first, the work is inserted into the work processing space portion 23 of the bending machine 1, and the tip of the work is abutting member of the back gauge 25.
Hit 41. Subsequently, the lower apron 5 is driven with respect to the upper apron 3, and bending is performed between the punch 7 and the die 9.

It should be noted that these series of operations are automatically performed by the NC device.

An example of a die determining method in the NC bending machine 1 will be described below. FIG. 3 is a flow chart for explaining the automatic die determination method, in which the final machining shape data of the work is first input using the input means (step 51).

On the NC device side, the work is sequentially developed from the bending point having the highest priority based on the inputted final machining shape data of the work (steps 52-54). In the development of this work, for example, if a work W having a final processed shape as shown in FIG. 4 (a) is described, as shown in FIG. Then 180 °
Invert horizontally to unfold bending point 6. Further, turn the inside out to expand the bending point 5, then turn the inside out 180 °
After flipping horizontally, bend point 4 is unfolded. Next, reverse the front and back to develop the bending point 3, and then reverse the front and back together.
The bending point 2 is developed by horizontally reversing 180 °, and finally it is horizontally reversed 180 ° together with the front and back reversing to develop the central bending point 1. By these expansions, a plurality of (seven in this embodiment, as shown in FIG. 4) bending steps are determined and the expansion order is determined.

In this way, the expansion order is 7-6-5-4-3-2-1-1.
After that, the reverse order is determined as the folding process order. In other words, the folding process sequence is 1-2-3-4
It is determined to be 5-6-7 (step 55).

After the bending process order is determined in this way, the work before bending and the work after bending in each bending process are combined to draw a (composite) figure according to the process order (step 56). In this drawing, as shown in FIG. 5, under the condition that the corresponding bending points are located at a predetermined one point, the figures of the work before bending and the work after bending in each bending step are combined. Of. In FIG. 5, the solid line shows the shape after bending, and the broken line shows the shape before bending.

In this way, if the figures before and after bending are combined according to the process sequence, the work non-existing areas R and S where the work is not located are determined based on a predetermined point, and the work non-existing areas are determined. R and S are the areas where the mold can exist. Therefore, a standard mold having a shape that fits in the work non-existing regions R and S, in other words, a mold that does not interfere with the work in the actual bending process, is first of many standard molds that are registered in advance. Search from (Step 5
7). If the desired standard mold is found in this search, the mold number is displayed and the mold is determined (step 58).

If no standard mold that fits in the work-absent areas R and S is found in step 57, consider the mold strength and consider this area.
Draw the smallest mold that fits in R and S (step 59).

Regarding the die thus drawn, when considering the die strength next, and if the die cannot withstand the required pressure, the rank of the priority is lowered and the deployment order from the final processed shape is changed ( Steps 60, 61).

When it is judged in the calculation of the mold strength in step 60 that the strength is sufficient, the mold drawn in step 59 is used as the mold and the information is drawn on the drawing, or the tape or other output means is used for NC. Output to the device (step 62).

According to this embodiment, a die that does not interfere with the work in the actual bending process is searched from among a large number of molds that have been registered in advance, so that the die used for the actual bending process is determined. Therefore, the die can be easily and accurately determined in a short time, and the working efficiency is improved. In particular, in the case where the final processed shape of the work is complicated, the above effect becomes more remarkable as compared with the conventional case where the die is determined by the manual work of the operator.

It should be noted that the present invention can be variously modified within the scope of the technical idea described in the claims, not by the above-described embodiments. Further, in the above-mentioned embodiment, one type of the final shape data of the work is input and the mold is determined according to the data. However, the final shapes of a plurality of works are registered and the respective works are sequentially developed, Determine the bending process order as the reverse order of, and for multiple workpieces,
If a region where no figure exists in the bending is obtained and a mold that fits in the region is determined, a common mold that can process a plurality of works can be determined.

[Effects of the Invention] As can be understood from the above description of the embodiments, according to the present invention, a mold that does not interfere with the work in the actual bending process can be selected from a large number of molds registered in advance. The mold to be used for the actual bending process is determined by searching from, and the mold can be determined easily and accurately in a short time, and the work efficiency is improved. In particular, in the case where the final processed shape of the work is complicated, the above effect becomes more remarkable as compared with the conventional case where the die is determined by the manual work of the operator.

[Brief description of drawings]

FIG. 1 is a perspective view of a folding machine used in an embodiment of the present invention, FIG. 2 is a perspective view of a back gauge device used in the folding machine, and FIG. 3 is an embodiment of the present invention. 4 is a flow chart for explaining the above-mentioned embodiment, FIG. 4 is a process drawing of a work for explaining the above embodiment, and a point bending process diagram, and FIG. It is a figure. 1 ... Bending machine, 7 ... Punch 9 ... Die, W ... Work

Claims (1)

[Claims] 1. The final machining shape data input in a mold determination method for an NC bending machine, which actually determines a mold to be used by an NC device before actually bending a work a plurality of times by an NC bending machine. Based on the setting of multiple bending steps corresponding to the bending points based on each of the bending points, the work before bending and the work after bending in each bending step are set under the condition that each corresponding bending point is located at a predetermined point. A shape in which the work is synthesized and displayed, a work non-existing area in which the work is not located is set on the basis of a predetermined one point, and the work can be located in the predetermined one point and in the work non-existing area. A method for determining a mold in an NC bending machine, wherein a mold to be actually used is determined by searching among a large number of molds that have been registered in advance.