WO2009101688A1

WO2009101688A1 - Electric discharge machining device

Info

Publication number: WO2009101688A1
Application number: PCT/JP2008/052406
Authority: WO
Inventors: Tomoko Sendai; Kohtaroh Watanabe; Kazushi Nakamura
Original assignee: Mitsubishi Electric Corporation
Priority date: 2008-02-14
Filing date: 2008-02-14
Publication date: 2009-08-20
Also published as: JPWO2009101688A1

Abstract

An electric discharge machining device includes an input means (12) to input the simulation profile data being a simulation result of a cutting work according to the designed profile data, an electrode profile data input means (11) to input the electrode profile data generated by a CAD (1), a computational means (14) to compute an interference of the simulation profile with the electrode profile data and to calculate a machining area in relation to change in the machining depth, a machining condition setting means (14) to set up a machining condition according to the machining area calculated by the computational means, and a machining control section which controls discharging between electrodes and a workpiece using the machining condition set up by the machining condition setting means to proceed the machining. Such an arrangement reflects any uncut portion left in a cutting simulation result, thereby reducing the burden on a worker.

Description

EDM machine

This invention relates to generation of machining conditions and determination of a machining order of an electric discharge machining apparatus.

Input the workpiece (mold) and electrode design information designed by the CAD device based on the product design information and create the numerical control program (hereinafter referred to as NC program) and the electrode and workpiece For example, Patent Document 1 discloses a technique for extracting workpiece data from design information and creating a machining program and a movement program based on the information.
And in this patent document 1, from the information before the electric discharge machining of the workpiece, if there is a trade-in processing portion, the trade-in shape dimension, the machining hole position, the machining number, the finished surface roughness, the machining accuracy, the material of the workpiece, In addition, when data required for creating machining programs such as machining depth is analyzed and collected from the shape data of the electric discharge machining part of the final mold from the workpiece design information, when the trade-in shape and electrode reach a predetermined depth The cross-sectional areas are obtained at a plurality of positions in the Z-axis direction by comparing the obtained machining shapes, and the optimum machining current value is obtained.

Japanese Patent Laid-Open No. 2003-291033

Generally, in electric discharge machining that engraves a predetermined shape, the area that can be cut before electric discharge machining is trade-in processed by cutting or the like. Depending on the processing depth, it is not constant and changes in a complicated manner.
In electric discharge machining, machining conditions are generated in consideration of the machining area.
The technique described in Patent Document 1 calculates machining conditions using a pre-designed shape of electric discharge machining created by CAD, that is, a trade-in shape dimension after cutting, as a work model. Since the shape after cutting that is the object to be processed and the trade-in shape dimensions created on the CAD result in a difference in the remaining part due to the relationship between the cutting tools, the generated machining conditions are optimal. Must not.
In other words, even if a trade-in shape dimension after cutting is created on a CAD and cut, a leftover portion is generated due to the influence of the cutting tool, etc., and the presence of this leftover portion is greatly influenced by the generated machining conditions. It will have an effect. (See Figure 17)
In other words, the actual post-cut shape cannot be created in the normal CAD design process.
Also, these trade-in workpiece models after cutting on CAD are created in consideration of the cutting area, such as filling the area where the cutting tool does not enter from the final workpiece shape in the normal CAD design process. It had to be a lot of work to create it.

The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain an electric discharge machining apparatus that performs machining as requested by a user without requiring user know-how and special labor.

An electric discharge machining apparatus according to the present invention comprises: input means for inputting simulation shape data which is a simulation result of cutting based on designed shape data; electrode shape data input means for inputting electrode shape data; and the simulation shape A calculation means for calculating interference between the data and the electrode shape data, and calculating a processing area according to a change in processing depth; a processing condition setting means for setting a processing condition according to the processing area obtained by the calculation means; The machining conditions set by the machining condition setting means are used to control the discharge between the electrode and the workpiece to perform the machining.

According to the present invention, since the data after cutting, that is, the data before electric discharge machining, is accurately expressed, it is possible to calculate an accurate machining area that is not conventionally available and to obtain appropriate machining conditions. .
According to the present invention, since the type of the work model and the electrode model is input, an accurate machining area can be calculated by adjusting the size of the internal model in accordance with the actual model, and appropriate machining conditions can be calculated. There is an effect that can be obtained.

It is the schematic which shows schematic structure of an electric discharge machining apparatus. 3 is an operation flowchart of a machining condition generation unit in the first embodiment. It is a figure which shows the electrode shape after reduction, and the electrode shape before reduction. 10 is an operation flowchart of a machining condition generation unit in the second embodiment. It is a conceptual diagram at the time of processing using a some electrode. 14 is an operation flowchart of a machining condition generation unit in the third embodiment. 10 is an operation flowchart of a machining condition generation unit in the fourth embodiment. It is a figure which shows an analysis condition setting screen. 10 is an operation flowchart of a machining condition generation unit in the fifth embodiment. It is a figure explaining the machining allowance in a workpiece. It is the table in which the process conditions according to the process area in Embodiment 6 were set. 20 is a flowchart for determining processing conditions according to the processing area in the sixth embodiment. 20 is an operation flowchart of a machining condition generation unit in the eighth embodiment. 20 is a flowchart for obtaining an area change rate in the eighth embodiment. 20 is an operation flowchart of the machining condition generation unit in the ninth embodiment. 38 is a flowchart for obtaining an area change in the ninth embodiment. It is a figure explaining the leftover part at the time of cutting.

Embodiment 1 FIG.
FIG. 1 is a diagram showing a schematic configuration in the present embodiment showing a flow of control inside an electric discharge machining apparatus based on data from CAD (Computer Aided Design) and a cutting simulation apparatus.
When a die is manufactured by electric discharge machining, in general, in a region where cutting can be performed before electric discharge machining, trade-in processing is performed by cutting or the like in order to shorten the machining time.
That is, when designing, a user designs a product (workpiece) using a three-dimensional CAD 1 or the like, creates definition information or product drawings as shape data, and uses CAM (Computer Aided Manufacturing) based on the shape data. ) Outputs a cutting NC program for cutting a die such as a cutting tool path.
Then, based on the NC program output from the CAM, a cutting tool or the like performs cutting, and a trade-in die that has undergone trade-in before electric discharge machining is manufactured.
Thereafter, electric discharge machining is performed based on an NC program for electric discharge machining for electric discharge machining of a trade-in-processed mold, and machining is performed as a final product.

The cutting simulation apparatus 2 in FIG. 1 inputs a cutting NC program for cutting, virtually moves the cutting tool according to the tool path based on the cutting program, and selects a portion through which the tool has passed. The post-cutting shape data 4 is created by calculating the difference from the original shape.
Note that the cutting simulation device 2 holds the data of the dimensional shape of the cutting tool, calculates the shape of the part left behind by the selected cutting tool, and creates post-cutting shape data.

The CAD 1 also designs an electrode for electric discharge machining and similarly creates electrode shape data.
The electrode shape data will be described as data before reduction by electric discharge machining.
Here, the reduction of the electrode shape data is generally performed when machining is performed with an electrode for electric discharge machining having the same dimensions as the shape of the workpiece designed by CAD. In addition, for example, with respect to the processed shape of a workpiece of φ10mm, the electrode is processed using a φ9.2mm electrode considering the swing and gap. Done.

The electric discharge machining apparatus 3 generates electric discharge between the electrode 4 and the workpiece 5 to perform machining, and controls the relative movement between the electrode 4 and the workpiece 5 and the supplied energy. To process the workpiece 5.
The electric discharge machining apparatus 3 according to the present embodiment inputs solid shape data input unit 11 that inputs electrode shape data before reduction from CAD 1 and shape data after cutting from cutting simulation device 2 as a shape expressed by a triangular patch. Each function includes a triangular patch data input unit 12, a required specification input unit 13 for inputting required specifications, a machining condition generation unit 14, and a machining control unit 15 for controlling electric discharge machining.
The triangular patch is a data format normally held by a three-dimensional CAD that represents a three-dimensional object with a small triangular surface.

FIG. 2 is a flowchart showing the operation of the machining condition generation unit 14.
The machining condition generation unit 14 includes, for example, required specifications such as electrode material, workpiece material, and finish surface roughness input by the user via the required specification input unit, electrode shape input via the solid data input unit 11, and cutting Data on the post-cutting shape including the actual unprocessed portion simulated by the simulation apparatus 1 is input.
Then, the electrode shape and the post-cutting simulation shape data are converted into a triangular patch data format to convert the data into an area extraction model, and the interference between the electrode 4 and the workpiece 5 according to the processing depth (processing progress). A part (part to be subjected to electric discharge machining) is calculated, and a DB indicating the machining depth and the machining area is created. As a DB creation method, for example, there is a technique shown in WO2004 / 103625.
Then, a machining condition corresponding to the machining area corresponding to the required specification and machining depth is determined, and electric discharge machining is performed via the machining control unit 15.

According to the present embodiment, since the machining area is calculated based on the actual shape of the workpiece 5 in which there are uncut parts and the like that are actually machined and simulated by the cutting simulation device 2, the machining area should be actually machined. There is an effect that an appropriate processing condition according to the processing area is generated.
In addition, the post-cutting shape to be input is obtained by moving the cutting tool along the tool path and calculating the difference from the original shape by passing the tool, but the three-dimensional shape represented by the triangular patch is a CAD user. It is possible and practical to perform complex calculations that are difficult with calculations between the solid models created by H.
In Embodiment 1, the shape after cutting is assumed to be a shape expressed by a triangular patch. Instead of a triangular patch, a polygon mesh other than a triangular patch or a three-dimensional shape is expressed by XY coordinates and a Z height. Even if the map is used, the same effect as in the first embodiment is obtained.

Embodiment 2. FIG.
In the first embodiment, the electrode shape data before the reduction is used, but the electrode shape data after the reduction may be used.
In that case, as shown in FIG. 3, since the hatched portion is processed, the electrode shape data before reduction is actually performed by adding the thickness corresponding to the reduction amount to the electrode shape data after reduction, and actually performing electric discharge machining. Convert to
Specifically, as shown in the flowchart showing the operation of the processing condition generation unit 14 in FIG. 4, after inputting the electrode shape, the electrode data is fattened by the reduced amount and converted into an area extraction model. Then, the interference part (the part to be subjected to electric discharge machining) between the electrode 4 and the workpiece 5 corresponding to the machining depth (progress of machining) is calculated, and a DB indicating the machining depth and the machining area is created.

Embodiment 3 FIG.
In this embodiment, a case where a workpiece is processed using a plurality of electrodes will be described.
When processing using a plurality of electrodes, the processing amount at each electrode varies greatly depending on the processing order.
For example, when a final machining shape as shown in FIG. 5 is machined, a portion to be subjected to electric discharge machining after cutting is a hatched area.
Here, when electric discharge machining is performed using the electrode 1 and the electrode 2, in the case of machining by “electrode 1 → electrode 2” and the case of machining by “electrode 2 → electrode 1”, the machining portion in each electrode Is a filled portion, and the amount of processing differs greatly, and it is not possible to set an appropriate processing condition according to the processing area.
Therefore, in this embodiment, when a plurality of electrodes are used, the processing order and the electrode shape are input by the user (specifically, the electrode shape data sent from CAD1 is displayed and the order is selected), This is the one that optimally sets the processing conditions for each electrode.

Specifically, as shown in the flowchart showing the operation of the processing condition generation unit 14 in FIG. 6, the processing order of each electrode used for processing is input and the shape of each electrode is input.
And after performing model conversion for area extraction similarly to Embodiment 1, the interference part with a to-be-processed object is calculated for every electrode to be used, and the electrode 4 according to processing depth (progress of processing) Then, the interference part (the part to be subjected to electric discharge machining) of the workpiece 5 is calculated and a DB indicating the machining depth and the machining area is created.
Then, an interference portion (electric discharge machining portion) by the electrode is removed from a portion to be removed by electric discharge machining, and preparation for calculation of an interference portion at the next electrode is performed.
Thereafter, the processing conditions corresponding to the processing area corresponding to the required specifications and the processing depth are determined, and the processing conditions are determined repeatedly until the processing conditions of all the electrodes used for processing are determined.

According to the present embodiment, even when processing is performed using a plurality of electrodes, the processing area for processing with each electrode can be accurately calculated by specifying the processing order and electrode shape for each electrode. Therefore, the optimum machining conditions are selected, and high-speed and high-precision machining can be performed.

Embodiment 4 FIG.
This embodiment has a function of estimating the machining time with respect to the third embodiment, and calculates the total machining time corresponding to the case where the order is changed, and determines the order so that the machining time is shortened. is there.
Specifically, as shown in the operation flowchart of the processing condition generation unit 14 in FIG. 7, when a processing order is input, a processing order possibility table that assumes the processing order of each electrode according to the number of all input electrodes. Is created.
This processing order possibility table exists for the number of floor combinations when all the electrodes are different in shape. For example, when processing with electrodes A, B, and C, “A → B → C”, “ A → C → B ”,“ B → A → C ”,“ B → C → A ”,“ C → A → B ”, and“ C → B → A ”.
And it operates similarly to the above-mentioned embodiment, and performs model conversion of area extraction.

Further, the shortest machining time is initialized, and the machining conditions in the inputted machining order are determined in the same manner as in the third embodiment.
Then, for example, the machining time is obtained by using the technique disclosed in WO2004 / 103625, and “minimum machining time> machining time” is determined. If the determination result is positive, the machining time is input to the minimum machining time. The processing order is the shortest processing order.
The shortest processing order in the combination can be obtained by repeatedly executing the above operations for all the processing orders (for example, six kinds of processing orders for the three types of electrodes as described above). As a change.

According to the present embodiment, the processing condition generation unit 14 estimates the processing time in each processing order according to the electrode shape input by the user and the type of electrode used (specifically, an example of processing order input). Since the order is determined so as to be shorter, there is an effect that high-speed machining can be performed without being aware of the machining order.
In particular, the combination of a low input energy such as rib processing and normal bottom processing is highly effective.

Embodiment 5
In the fifth embodiment, whether or not the workpiece model that is the final shape of the workpiece includes discharge allowance and whether or not the electrode model includes a reduction amount are input. .
For example, the screen shown in FIG. 8 is displayed, and the analysis conditions in the machining condition generation unit 14 are set by the user.
Specifically, if the work model includes the discharge allowance as in the cutting simulation result, check “immediately after cutting”, and if not, check “final product”. In the case of “final product”, a screen for inputting a machining allowance to be subjected to electric discharge machining is displayed.
The final product is a finished product that has been subjected to cutting processing → electric discharge processing → polishing processing. For example, in the case of mold processing, it refers to the mold itself.
Also, if the electrode model contains a reduction amount, check “No reduction”, if not, check “Reduced”, and if it contains, a screen for entering the reduction amount. indicate.

FIG. 9 is an operation flowchart of the machining condition generation unit 14. When the user selects a post-reduction model on the analysis condition setting screen, the electrode is an electrode to which reduction amounts such as swing and gap are added. Therefore, the process shifts to shape input after the cutting simulation. However, in the case of the model before reduction, the electrode data is thickened by the amount of reduction such as swinging and gap.
If the workpiece model is immediately after cutting, the process proceeds to a process for converting to a model for area extraction. If the workpiece model is a final product, processing is performed to thicken the post-cutting model of the machining allowance. . To thicken the model after cutting by the machining allowance refers to fleshing the machining area as shown in FIG.
That is, as shown in FIG. 10, although there is an error with the actual post-cutting model, it is possible to obtain the machining conditions to some extent by using the hand-held data as it is, and performing the meat for the machining allowance.
After that, as in the above-described embodiment, the interference part between the electrode and the workpiece is calculated, a DB indicating the relationship between the machining depth and the machining area is created, the machining conditions according to the machining area are determined, and electric discharge machining is performed. I do.

According to the present embodiment, the actual electrode model data possessed by the user may be after reduction or before reduction in consideration of the discharge gap and fluctuation, but the user has to bother the shape on the CAD. Even if it is not created, there is an effect that the processing conditions can be obtained using the shape on hand.
In addition, it is desirable that the shape before electric discharge machining, that is, the shape after cutting, is as close as possible to the actual shape, but some users may only have a final product shape model that has been cut and electric discharge processed. Also, it can be set by setting analysis conditions.
In this embodiment, the shape type is input from the screen. However, any form that can be imported from the outside, such as a file, may be used.

Embodiment 6 FIG.
In the present embodiment, an example of a flow part for calculating an interference part between an electrode and a workpiece in the first embodiment and creating a DB indicating a processing depth and a processing area and a flow part for determining a processing condition from the area will be described. .
Since the area corresponds to the processing conditions, a table in which the processing conditions E0 to E4 are set in advance according to the corresponding area to be processed as shown in FIG. 11 is provided. The processing conditions suitable for the corresponding area to be selected are selected. The processing conditions and the area are generally related by current density.
In the present embodiment, the processing conditions are switched based on the corresponding area to be processed based on the table shown in FIG.

FIG. 12 is a flowchart showing an operation for determining the processing conditions according to the processing area.
First, the machining areas A0 and A1 at the machining start position D0 and the machining end position (final depth) D1 are first determined based on the actual shape in which there are uncut portions that are actually cut, and the corresponding machining conditions E0 and E1 are obtained. It is obtained from the table of FIG.
If the machining strips E0 and E1 are the same, the machining area range to be machined is the same at the machining start position D0 and the machining end position D1, and thus the machining condition A0 is output and the process ends.
On the other hand, when E0 and E1 are different, there is a change in the machining area between the machining start position D0 and the machining end position D1, and therefore the area A2 of the center depth D2 between the machining start position D0 and the machining end position D1 is set. Ask.

When the machining condition corresponding to the area A2 at the center depth D2 is the same as the machining condition E0, the timing for switching the machining condition from E0 to E1 exists between the center depth D2 and the machining end position D1.
On the other hand, when the machining condition corresponding to the area A2 at the center depth D2 is the machining condition E1, the timing for switching the machining condition from E0 to E1 exists between the center depth D2 and the machining start position D0. .
That is, in order to determine the position for switching the machining conditions, in the former case, the area A3 of D3 between the center depth D2 and the machining end position D1, and in the latter case, the center depth D2 and the machining start position D0. The operation of obtaining the area A3 of D3 is repeated until the interval of D reaches 5 μm, and finally Dn is set to a depth for switching to E1.
In this embodiment, for the sake of simplicity, the case where the machining conditions are two stages is used, but the same processing is performed when the machining conditions are switched to a plurality of stages instead of two stages.
Further, although the end condition is set until the step width becomes 5 μm or less, other values may be used instead of 5 μm.

Since the shape after cutting is generally complicated, it is necessary to reduce the number of calculations of the interference portion between the electrode and the workpiece as much as possible.
In the conventional method, since the area corresponding to the depth position is obtained, if the step of the depth position for obtaining the area is roughened, an error in the depth direction occurs, and the step of the depth position for obtaining the area is made fine. It becomes a huge amount of calculation.
By the way, since the data of the machining condition DB normally held by the die-sinking electric discharge machine is not continuous but discrete, it is only necessary to know the machining depth at the timing in the area where the machining conditions need to be switched.
According to the present embodiment, since the number of calculations of the interference portion between the electrode and the workpiece is reduced, there is an effect that the calculation time is short.

Embodiment 7 FIG.
In the sixth embodiment, the machining area is obtained from the shape after the cutting simulation, and the machining conditions according to the corresponding area to be machined are associated in advance with the table shown in FIG. 11, but the machining area is separately input by the user, It may be set by input from a file.
In other words, the machining condition is changed at a location where the area changes in accordance with the input, and the number of times of calculating the interference portion between the electrode and the workpiece is reduced, so that the calculation time is short.

Embodiment 8 FIG.
In the eighth embodiment, as shown in FIG. 13, the machining area is obtained from the shape after the cutting simulation, and the depth when the change rate of the machining area is a times or more (a> 1.0) is obtained. The machining conditions are changed at the depth position.
Processing corresponding to the change in the processing area will be described with reference to the flowchart of FIG.

First, the machining areas A0 and A1 at the machining start position D0 and the machining end position (final depth) D1 are first determined based on the actual shape in which there are uncut portions that are actually cut.
Then, it is determined whether or not the rate of change between the machining areas A0 and A1 is a times. If the rate of change in machining is a times or less, there is little change in the machining area and there is no need to change the machining conditions. A machining condition corresponding to the area A0 of the machining start position D0 is obtained, and electric discharge machining is performed.
On the other hand, when the rate of change between A0 and A1 is a times or more, it can be determined that there is a large change in the area to be machined between the machining start position D0 and the machining end position D1, and the machining conditions are set for the area A0 on the way. Must be changed for A1.
Therefore, as in the sixth embodiment, since there is a change in the machining area between the machining start position D0 and the machining end position D1, the center depth D2 between the machining start position D0 and the machining end position D1 is obtained.

Then, the area A2 at the center depth D2 is compared with the area A0 at the machining start position D0. If the rate of change between the area A0 and the area A2 is a or less, the machining depth having a large area change is the center depth D2. And the processing end position D1.
On the other hand, if the change rate of the area A2 and the area A2 at the center depth D2 is a or more, the machining depth having a large area change exists between the center depth D2 and the machining start position D0.
That is, in order to determine the position for switching the machining conditions, in the former case, the area A3 of D3 between the center depth D2 and the machining end position D1, and in the latter case, the center depth D2 and the machining start position D0. The operation of obtaining the area A3 of D3 is repeated until the interval of D reaches 5 μm, and finally the depth is switched to the processing condition E1 corresponding to the area A1 at the position of Dn.

In this embodiment, for the sake of simplicity, the case where the machining conditions are two stages is used, but the same processing is performed when the machining conditions are switched to a plurality of stages instead of two stages.
Further, although the end condition is set until the step width becomes 5 μm or less, other values may be used instead of 5 μm.
In addition, it is necessary to set an appropriate value for the rate of change a in the present embodiment as compared with the increment of the area in the general processing condition DB. For example, 1.2 or the like is used in the case of a copper electrode or a St workpiece.

According to the present embodiment, since the number of times of calculating the interference portion between the electrode and the work is reduced, there is an effect that the calculation time is short.
In the sixth embodiment, the processing condition DB corresponding to the area for calculating the depth needs to be determined in advance. However, when this method is used, the relationship between the area and the depth can be obtained even if it is not determined in advance. it can.

Embodiment 9 FIG.
In the eighth embodiment, the machining depth at which the machining conditions change is obtained based on the change rate of the machining area. However, in the present embodiment, as shown in FIG. When it becomes, the depth is obtained, and the machining conditions are changed at the depth position.
Processing corresponding to the change in the processing area will be described with reference to the flowchart of FIG.

First, the machining areas A0 and A1 at the machining start position D0 and the machining end position (final depth) D1 are first determined based on the actual shape in which there are uncut portions that are actually cut.
Then, it is determined whether or not the difference between the machining areas A0 and A1 is equal to or greater than b (mm ² ). If the change in area is equal to or less than b (mm ² ), it is not necessary to change the machining conditions, so machining is started. A machining condition corresponding to the area A0 of the position D0 is obtained, and electric discharge machining is performed.
On the other hand, if the difference between A0 and A1 is equal to or greater than b (mm ² ), it can be determined that there is a large change in the area to be machined between the machining start position D0 and the machining end position D1, and the machining condition is set to the area A0 on the way. You have to change from A to A1.
Therefore, as in the sixth embodiment, since there is a change in the machining area between the machining start position D0 and the machining end position D1, the center depth D2 between the machining start position D0 and the machining end position D1 is obtained.

Then, the area A2 at the center depth D2 is compared with the area A0 at the machining start position D0, and if the area change between the area A0 and the area A2 is equal to or less than b (mm ² ), the machining depth having a large area change is It exists between the center depth D2 and the processing end position D1.
On the other hand, if the area change between the area A2 and the area A2 at the center depth D2 is equal to or greater than b (mm ² ), the machining depth having a large area change exists between the center depth D2 and the machining start position D0.
That is, in order to determine the position for switching the machining conditions, in the former case, the area A3 of D3 between the center depth D2 and the machining end position D1, and in the latter case, the center depth D2 and the machining start position D0. The operation of obtaining the area A3 of D3 is repeated until the interval of D reaches 5 μm, and finally the depth is switched to the processing condition E1 corresponding to the area A1 at the position of Dn.

In this embodiment, for the sake of simplicity, the case where the machining conditions are two stages is used, but the same processing is performed when the machining conditions are switched to a plurality of stages instead of two stages.
Further, although the end condition is set until the step width becomes 5 μm or less, other values may be used instead of 5 μm.
In addition, the area change b (mm ² ) in the present embodiment needs to be set to an appropriate value as compared with the area increment in the general processing condition DB. For example, in the case of a copper electrode or an St workpiece, Use 10 etc.

According to the present embodiment, since the number of times of calculating the interference portion between the electrode and the work is reduced, there is an effect that the calculation time is short. According to the present embodiment, since the number of times of calculating the interference portion between the electrode and the work is reduced, there is an effect that the calculation time is short.
In the sixth embodiment, the processing condition DB corresponding to the area for calculating the depth needs to be determined in advance. However, when this method is used, the relationship between the area and the depth can be obtained even if it is not determined in advance. it can.

The present invention can be applied to a program creation device for performing electric discharge machining.

Claims

An input means for inputting simulation shape data which is a simulation result of cutting processing based on the designed shape data;
Electrode shape data input means for inputting electrode shape data;
A calculation means for calculating interference between the simulation shape data and the electrode shape data, and calculating a processing area accompanying a processing depth change;
Processing condition setting means for setting the processing conditions according to the processing area obtained by the calculation means,
An electric discharge machining apparatus that performs machining by controlling electric discharge between an electrode and a workpiece using machining conditions set by the machining condition setting means.
2. The electric discharge machining apparatus according to claim 1, wherein the simulation shape data, which is a simulation result of cutting, is shape data having an unprocessed portion generated in the cutting.
3. The electric discharge machining apparatus according to claim 1, wherein the cutting simulation shape data to be input is three-dimensionally displayed in a triangular patch or Z map format.
4. The electric discharge machining apparatus according to claim 1, wherein the input electrode shape data is data to which a reduction amount in consideration of an electric discharge gap and fluctuation is applied.
There is a means for inputting a plurality of electrode shape data and processing order, and when calculating the interference between the simulation shape data and the electrode shape data by the calculation means, the work shape as the work shape after the Nth electrode (N> 1) is determined from the work shape. 5. The electric discharge machining apparatus according to claim 1, wherein a shape obtained by removing the N-1th electrode shape portion is used.
Has a means to input multiple electrode shape data and machining order, calculates all possible machining orders based on the input multiple electrode shape data and machining order, calculates the machining time in each machining order, and processes 6. The electric discharge machining apparatus according to claim 1, wherein machining with a short time is selected and executed.
A means for inputting whether the work model includes a discharge allowance or an electrode model includes a reduction amount, and deforms the work model or the electrode model based on the input information. Item 7. The electric discharge machining apparatus according to any one of Items 1 to 6.
The calculation means calculates a machining depth at which an area change occurs based on an area change rate or an area change amount at a machining start position and a machining end position. Electric discharge machine.
A CAD device for designing electrode shape data of an electrode and shape data of a workpiece;
A cutting simulation device for inputting shape data of a workpiece from the CAD device, simulating simulation shape data indicating an actual machining shape after cutting, and outputting the simulation shape data,
Electrode shape data, input means for inputting simulation shape data, calculation means for calculating interference between the simulation shape data and the electrode shape data, and calculating a processing area associated with a change in processing depth, processing obtained by this calculation means Machining condition setting means for setting the machining conditions according to the area, and machining control means for controlling the discharge between the electrode and the workpiece by using the machining conditions set by the machining condition setting means. An electrical discharge machining device,
An electrical discharge machining system comprising: