JPH06304818A - Nc data preparation method for wire electric discharge machine - Google Patents

Abstract

PURPOSE:To shorten work defining time, shorten working time, and promote automation of machine work by arranging a discriminating means to discriminate whether it is enlarging work or cutting-off work according to the size of a shape when a work shape is extracted. CONSTITUTION:A shape designing means (keyboard) 14a is arranged to design a work shape DF for wire electric discharge machining. A work process is set with every shape by a work process setting means according to the work shape DF designed by this shape designing means 14a. When the work shape is extracted, whether it is enlarging work or cutting-off work is discriminated automatically by a discriminating means (processor) 11a according to the size of a shape. An automatic approach setting means sets an approach automatically in the lengthwise direction of the work shape when work discriminated by this discriminating means 11a is the enlarging work and in the short direction of the work shape when it is the cutting-off work.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to NC for wire electric discharge machining.
It is related to the data creation method, especially the die CAD
The present invention relates to a method for creating NC data for wire electric discharge machining using a / CAM system or the like.

[0002]

2. Description of the Related Art FIG. 5 is a diagram showing a conventional die CAD / CAM system. In the figure, 1 is a die CAD / CA
M system, 1a is a mold design system (CAD system) for creating a drawing of a mold, 1b is an NC data creation system (CAM system) for creating NC data based on the CAD system 1a, and 2 is a mold NC for processing
The data. As shown in FIG. 5, mold CAD / CAM
System 1 is a mold design system (CAD system) 1
a and NC data creation system (CAM system) 1b
It has and. The systems 1a and 1b may be composed of different devices.

In such a die CAD / CAM system 1, the CAD system 1a designs the product arrangement, the number of stages, the pitch, etc. based on the input product shape. After that, the CAM system 1b, based on the shape, processing order,
The machining speed, initial hole point, approach point, etc. are defined, and NC data 2 is automatically created and output. The shape is machined with a wire cut electric discharge machine, so CAM
System 1b is NC data 2 for wire cut electrical discharge machining
Create and output. The CAM system 1b creates NC data 2 by using the shape data created by the CAD system 1a as the trajectory of the wire as it is.

FIG. 6 is a diagram showing a conventional shape-periphery processing. For example, as shown in FIG.
If it is created by the AD system 1a, the CAM system 1b is the initial hole P0 of the punched shape DF.
After positioning with, point P1 → P2 → P3 →
The order of P4 → P5 → P1 → P0
C data 2 is created.

Now, the types of wire electric discharge machining methods will be described. First, as a wire electric discharge machining method, there is a so-called uncut portion and a relief method. FIG. 7 is a diagram showing a conventional uncut processing. As shown in FIG. 7, such a machining method uses the cutting residual amount K immediately before the machining end point P1 of the shape.
(| P6-P1 | = K) and the relief amount N (| P7-P6 | = N) from the shape to prevent the operator from accidentally cutting the shape while keeping it unstable. To prevent.

Further, as a wire electric discharge machining method, there is another function called expansion machining. FIG. 8 is a diagram showing a conventional enlargement process. As shown in FIG. 8, this function is a processing method for sequentially calculating a processing shape deviating from the final processing shape by a pitch amount P inward, and obtaining a processing trajectory. In the actual processing, the wire is offset from the center of the shape by a pitch amount obtained by multiplying the wire diameter by a coefficient T (0 <T <1), and the shape is sequentially processed around the entire circumference. In this type of enlargement processing, there is no die for cutting off, so the operator does not have to remove it.

FIG. 9 is a view showing conventional machining paths having a plurality of shapes. In the figure, 3 is a workpiece as a workpiece, 4 is a machining path, and DF1 to DF5 are shapes to be punched into the workpiece 3, respectively. In the case where there are a plurality of machining shapes, for example, if the CAD system 1a creates a large number of shapes on the work 3 in FIG. 9, the CAM system 1b first specifies the shape to be machined. If DF1, DF2 is second, DF3 is third, DF4 is fourth, and DF5 is last, DF
1 initial hole I1 position designation → DF1 approach element A1 designation → DF2 initial hole I2 position designation → DF2 approach element A2 designation → DF3 initial hole I3 position designation → DF3 approach element A3
Designation → DF4 initial hall I4 position designation → DF4
The designation of the approach element A4 → the designation of the initial hole I5 position of the DF5 → the designation of the approach element A5 of the DF5 is performed in this order. Furthermore, the processing steps for each processing shape are expanded processing for the shapes DF4 and DF5, and D
If F1 to DF3 are to be cut off, DF
1 machining process designation (cut-off machining) → DF2 machining process designation (cut-off machining) → DF3 machining process designation (cut-off machining) → D
Designation of the machining process of F4 (enlargement machining) → designation of the machining process of DF5 (enlargement machining). Then, NC data such as the route 4 is created. Usually, when performing such a machining designation, the operator determines whether to perform the enlarging process or the cutting process depending on the area of the machining shape.
Since it takes too much time to perform the enlarging process for the large area, the cutting process is performed. For the relatively small area, the enlarging process is performed because it takes less time.

FIG. 10 is a diagram showing the approach of cutting and enlarging. As shown in FIG. 10, in consideration of the machining efficiency, the approach element is formed in the lateral direction of the shape (the distance from the initial hole to the approach element is short in order to reduce the approach distance when the uncut machining is performed. Direction) ((a) of FIG. 10). On the other hand, in the case of enlarging processing, it is attached in the longitudinal direction of the shape (the direction in which the distance from the initial hole to the approach element is long) from the viewpoint of accuracy that distortion is taken by processing beforehand with approach processing for small shapes. ((B) of FIG. 10).

Further, in a wire electric discharge machine having an automatic scrap processing function of removing scraps, which are scraps after cutting, with a magnet, the NC data to be created is displayed at the cutting position of the NC data on the editor screen. The operator edits the data by inserting a code (for example, M52) of the automatic scrap processing function and is used.

In addition to this, as related to the conventional NC data creating method for wire electric discharge machining of this kind,
There are techniques disclosed in JP-A-3-111124 and JP-A-1-205928. In the former publication, a "coreless processing" area is defined in advance, the wire is moved from the prepared hole position to the center of the coreless processing area, and then the contour of the coreless processing area and a locus of a similar shape are sequentially enlarged and processed. "NC data creation method for coreless machining in wire electric discharge machining" is disclosed. The latter publication describes CAD
By reading the figure information created in, the type of figure (whether it is hole processing or external processing) is recognized, and by specifying the contour and input / output points,
An NC wire cut processing device that automatically creates input / output data is disclosed.

[0011]

However, in the above-described conventional method for creating NC data for wire electric discharge machining, when there are a plurality of shapes to perform such wire electric discharge machining designation, an operator for each shape It is necessary to distinguish between enlarging processing and uncut processing, and specify the initial hole position and approach element in the appropriate direction, and the shape is 1
It took a lot of time to process more than 00 pieces. In addition, when performing automatic scrap processing, it is necessary to insert, for example, an M52 code by editing NC data, and the work of searching for a cut-off position from long NC data and inserting the code there is extremely troublesome. Was.

Therefore, the present invention has been made in order to solve the labor of the operator as described above and to specify the processing more efficiently. By automatically performing the processing discrimination and the processing specification, the work can be performed. An object of the present invention is to provide an NC data creation method for wire electric discharge machining that can shorten time and promote automation of machining.

Further, by automatically outputting the automatic scrap processing code and outputting the code for scrap processing at an appropriate position without editing the NC data,
An object of the present invention is to provide a method for creating NC data for wire electric discharge machining, which does not require a worker to remove scrap at the time of cutting during machining and can automate the machining.

[0014]

According to a first aspect of the present invention, there is provided an NC data creating method for wire electric discharge machining, wherein a shape designing means for designing a machining shape for wire electric discharge machining and a machining shape designed by the shape designing means. A machining step setting means for setting a machining step for each shape based on the above, and a discrimination means for automatically discriminating between enlarging processing and cutting processing according to the size of the shape when extracting the machining shape. It is equipped with.

According to a second aspect of the present invention, there is provided an NC data creating method for wire electric discharge machining, wherein a shape designing means for designing a machining shape for wire electric discharge machining and a machining shape designed by the shape designing means are used for each shape. A processing step setting means for setting a processing step, a determination means for automatically determining whether the processing shape is enlarged processing or cut-off processing according to the size of the shape when the processing shape is extracted, and the determination means. When the machining is expansion machining, the approach setting means for automatically setting the approach in the longitudinal direction of the machined shape and in the short direction of the machined shape in the case of cut-off machining is provided.

According to a third aspect of the present invention, there is provided an NC data generating method for wire electric discharge machining, wherein each shape is designed based on a shape designing means for designing a machining shape for wire electric discharge machining and a machining shape designed by the shape designing means. A machining step setting means for setting a machining step, a discrimination means for automatically discriminating between the enlarging machining and the cutting machining according to the size of the shape when the machining shape is extracted, and the discrimination means. In the case where the performed processing is cut-off processing, scrap processing position setting means for automatically setting the automatic scrap processing position when cutting the processed shape is provided.

[0017]

According to the NC data creation method for wire electric discharge machining of the first aspect of the invention, when the machining shape is extracted, it is automatically discriminated whether it is enlarging processing or cutting processing according to the size of the shape. Therefore, it is not necessary for the operator to distinguish and specify the enlargement processing or the cutting processing for each shape.

In the NC data creation method for wire electric discharge machining according to the second aspect of the invention, when the machining shape is extracted,
Depending on the size of the shape, it automatically determines whether it is enlarging processing or cutting processing, and in this determination, in the case of enlarging processing, the approach is set in the longitudinal direction of the processing shape and in the cutting processing, the approach is set in the lateral direction. Since the procedure is automatically performed, the operator can automatically set an appropriate approach according to the machining shape without instructing the approach element for each machining.

In the NC data creation method for wire electric discharge machining according to the third aspect of the invention, when the machining shape is extracted,
According to the size of the shape, it automatically determines whether it is enlarging processing or cutting processing, and in the case of cutting processing by this determination, the automatic scrap processing position is automatically set when cutting the processing shape. Therefore, the operator can edit the NC data without inserting the automatic scrap processing code and
Proper scrap processing is performed at the position immediately after the data shape is cut off.

[0020]

Embodiments of the present invention will be described below. <First Embodiment> FIG. 1 is a block diagram showing a CAD / CAM system for designing a die used in a method for creating NC data for wire electric discharge machining which is an embodiment of the present invention. Figure 5
FIG. 7 is a diagram showing a die CAD / CAM system of this embodiment, which is common to the above-mentioned conventional example. In the figure, 11a is a processor functioning as a central processing unit, 11b is a read-only memory (ROM) which is a read-only memory in which predetermined programs and the like are stored, and 11c is a temporary storage of various data and the like. RAM (random access memory) which is a readable memory for reading, 12 is a graphic display device for displaying a processed shape and the like graphically, 13 is a tablet device which is a figure input device, and 14a
Is a keyboard, 14b is an XY plotter which is a figure output device, 14c is a floppy disk drive, and 15 is a large-capacity storage device for storing various data files for die design, automatically created NC information and the like. The CRT is a display screen, and the DF is a blank shape, that is, a processing shape that is a die shape. Tablet surface 13 of the tablet device 13
A menu table 13b is attached to a, and various items and data are input by picking predetermined items written in the menu table 13b with a mouse (stylus pen) 13c. And this mouse (stylus pen) 13
Shape D, which is a die shape, using c and the keyboard 14a
After designing the figure F on the display screen CRT, define the machining of the die shape DF starting from the initial hole P0 and pick the command to create NC data with the mouse (stylus pen) 13c Automatically create NC tape along the outer circumference of DF.

Next, a method for creating NC data for wire electric discharge machining by the die CAD / CAM system having the above configuration will be described with reference to FIG.
It will be described with reference to FIGS. FIG. 2 is a diagram showing a wire machining path for shape machining according to the NC data generating method for wire electric discharge machining which is an embodiment of the present invention.

In FIG. 2A, the work 3 has 10
There are individual processed shapes DF1 to DF10, and the centers I1 to I10 of the respective shapes DF1 to 10 and the shapes DF1 to DF.
The six centers of gravity J1 to J6 are shown respectively. 2 (b)
4 shows a wire machining path 4 for machining those shapes DF1 to DF10. The machining path 4 is automatically determined by the die CAD / CAM system 1, and at the same time, the machining method of each of the shapes DF1 to DF10 is also automatically determined. How it is determined inside the system will be specifically described below with reference to FIG.

The processing order is automatically determined by the system in the X direction from the lower left of the screen. First, since the area of the shape DF1 is larger than the set value, it is automatically determined that cutting is performed, and from the center point I1 (the initial hole of DF1) automatically extracted for this shape DF1. , Seeking its shortest approach. In this case, since the shape DF1 is a perfect circle, the shape DF1 is processed horizontally to process the shape DF1. When the shape DF1 is cut off, in order to automatically scrap the die, the magnet or the like is moved to the center of gravity J1 of the shape DF1 and the die is removed (scrap processing code is output). Similarly, the shape DF2 is moved to the automatically extracted center point I2, the shape DF2 is processed, and when the shape DF2 is cut off, a magnet or the like is moved to the center of gravity J2, and then automatic scrap processing is performed. Next, similarly, the processed shape DF5 also moves to the center point I5 of the shape DF5, and since it is cut-off processing, the shape DF5 is processed by vertically approaching its shortest approach element A5.
Then, when the shape DF5 is cut off, the magnet for automatic scrap processing is moved to the center of gravity J5 of the shape, and the punching die is removed. Next, it moves to the center point I7 of the shape DF7. Since the area of the shape DF7 is smaller than the set value, the shape DF7 is automatically determined to be the enlargement processing, and the enlargement processing is performed while vertically approaching the element A7 from the center point I7. Similarly to the above, the shape DF8,
DF9, DF10, DF6, DF4, and DF3 are sequentially processed, and the process ends.

FIG. 3 is a flow chart showing the overall machining setting operation by the NC data generating method for wire electric discharge machining which is one embodiment of the present invention, and shows the above-mentioned machining settings in general.
In the figure, first, in step S1, the CAD system 1a
Draw a figure to create NC data. Next, in step S2, a determination value for determining whether the processing shape is cut-off processing or enlarged processing is set. The determination is made based on the area of the shape. If the size is larger than the set value, the cutting process is performed, and if the size is smaller, the expansion process is performed. In step S3, a machining process for automatically adding machining processes corresponding to the cut-off machining or enlargement machining determined in step S2 is set. In the processing step, how many times the shape is processed is set, and processing conditions such as an offset amount are set. In step S4, the command "automatic machining designation" is selected from the menu table 13b with the mouse 13c. Then,
The die CAD / CAM system 1 automatically determines the initial hole position of each shape, the approach element, the processing step, and the processing order. In step S5, when it is desired to change the machining order determined in step S4, the machining order of the shape is changed. In step S6, output conditions such as selection of absolute value / relative value at the time of creating NC data and output selection of machining code are set. Then, in step S7, the function name "NC data creation" for automatically creating NC data is selected from the menu table 13b with the mouse 13c, thereby automatically creating the machining path set so far. Then, in step S8, if there is a change in the NC data generated in step S7, it is changed using an editor. Finally, in step S9, the NC data is changed to a floppy disk, transferred to a cable, and output to the wire electric discharge machine.

FIG. 4 is a view showing machining NC data by the method for preparing NC data for wire electric discharge machining which is one embodiment of the present invention, and shows the NC data produced in FIG. In the figure, N1 calls a subprogram N21 of NC data for machining the shape DF1. Since the shape DF1 is cut off in N21, when cutting, the wire is cut at N21a, moved to the center of gravity J1 of the shape DF1, and the automatic scrap processing code M52 is output. Next, it moves in absolute value to the initial hole I2 of the shape DF2 processed by N2. A subprogram N21 of NC data for machining the shape DF2 is called at N3. Since the shape DF2 has the same shape as the shape DF1, the program of N21 is executed as in the case of DF1. Next, at N4, the workpiece is moved to the initial hole I5 of the processed shape DF5 by an absolute value. Shape DF with N5
Call the NC data subprogram N22 for processing 5. In N22, the shape DF5 is also cut off, so
At the time of cutting off, the wire is cut at N22a, moved to the center of gravity position J5 of the shape DF5, and the automatic scrap processing code M52 is output. Next, at N6, the workpiece is moved to the initial hole I7 of the processed shape DF7 by an absolute value. Shape DF with N7
A subprogram N23 of NC data for processing 7 is called. Since the shape DF7 is an enlargement process, the program N23 is executed. Similarly, it moves in absolute value to the initial hole I8 of the shape DF8 processed by N8. NC data subprogram N2 for machining shape DF8 in N9
Call 3. Since the shape DF8 has the same shape as the shape DF7, the program of N23 is executed like the DF7. In this way, each shape is sequentially processed from N10 to N19. Then, finally, the processing ends at N20.

As described above, the method for creating NC data for wire electric discharge machining according to the present embodiment is used in the die CAD / CAM system 1.
Of the die CAD / CAM system 1 based on the machining shape designed by the CAD system 1a for designing a machining shape for wire electric discharge machining (step S1 in FIG. 3) and the machining shape designed by the shape designing means. Machining process setting means for setting a machining process for each shape by the CAM system 1b (processing of step S3 in FIG. 3), and the CAM system 1b.
Area of the shape (size of shape) when processing shape is extracted by
According to the above, there is provided a discriminating means (process of step S2 in FIG. 3) for automatically discriminating whether it is the enlarging process or the cutting process. This configuration corresponds to the embodiment of the invention of claim 1.

Therefore, at the time of extracting the processing shape by the die CAD / CAM system 1, whether the expansion processing is performed according to the shape,
Alternatively, cutting processing is automatically determined, and unlike the conventional case, the operator does not need to specify the enlargement processing or the cutting processing for each shape separately, so there is no need for a troublesome determination operation. The definition time can be shortened. As a result, the labor of the operator can be saved, more efficient machining designation can be performed, and the machining time can be shortened and the machining can be automated by automatically performing machining discrimination and machining designation.

In particular, in the method for creating NC data for wire electric discharge machining according to the present embodiment, when the machining discriminated by the discriminating means is enlargement machining, it is in the longitudinal direction of the machining contour, and in the case of cutting machining, the machining contour. Approach setting means for automatically setting the approach in the lateral direction (process of step S4 in FIG. 3)
Is equipped with. And the die CAD / CAM system 1
When extracting the processing shape by, it is automatically determined whether it is enlarging processing or cutting processing according to the size of the shape, and if this judgment is enlarging processing, in the case of cutting processing in the longitudinal direction of the processing shape Automatically sets the approach in the lateral direction. This configuration corresponds to the embodiment of the invention of claim 2.

Therefore, an operator can automatically set an appropriate approach according to a machining shape without instructing an approach element for each machining unlike the conventional case. Can be shortened and the processing accuracy can be improved.

Moreover, the NC for wire electric discharge machining of this embodiment
In the data creating method, when the machining discriminated by the discrimination means is cut-off machining, scrap processing position setting means for automatically setting the automatic scrap processing position when cutting the machining shape (processing of step S3 of FIG. 3) Is equipped with. Then, when the machining shape is extracted by the die CAD / CAM system 1, it is automatically discriminated whether it is the enlargement machining or the cutting machining according to the size of the shape, and when the discrimination is the cutting machining, the machining is carried out. The automatic scrap processing position when the shape is cut off is automatically set. This configuration corresponds to the embodiment of the invention of claim 3.

Therefore, unlike the conventional case, the operator does not need to insert the automatic scrap processing code in the NC data editing, and there is no need to search the cut position from the long machining data on the data editing screen, and the NC data shape is eliminated. Since proper scrap processing is performed at the position immediately after cutting, the operator does not need to bother to remove the scrap at the time of cutting during processing, the processing definition time can be shortened, and processing can be automated.

<Second Embodiment> In the first embodiment, the position of the initial hole is the center position of the shape, but the position of the initial hole may be the center of gravity position. Also in this case,
The same operational effects as those of the first embodiment are obtained.

<Third Embodiment> In the first embodiment described above, the automatic scrap processing position is the center of gravity position, but the operator may arbitrarily specify the position as desired. In this case as well, the same operational effects as those of the first embodiment are obtained.

By the way, in each of the above embodiments, the die CAD
I explained the method of creating NC data for wire electrical discharge machining using the / CAM system, but CAD /
Of course, it can be applied to the CAM system. Further, in each of the above-described embodiments, the method of creating the NC data for wire electric discharge machining using the CAD / CAM system which is separate from the NC device has been described. However, the NC for the wire electric discharge machine incorporating the CAD / CAM system function is described. It can also be applied to devices.

[0035]

As described above, the NC data creating method for wire electric discharge machining according to the first aspect of the present invention comprises the shape designing means, the machining step setting means, and the discriminating means, and when the machining shape is extracted. Depending on the size of the shape, enlargement processing,
Alternatively, it is not necessary for the operator to distinguish between the enlarging process and the cut-off process for each shape by automatically discriminating the cut-off process.
The machining definition time can be shortened, work time can be shortened, and automation of machining can be promoted.

According to a second aspect of the present invention, there is provided an NC data generating method for wire electric discharge machining, which comprises a shape designing means, a machining step setting means, a discriminating means and an approach setting means. Depending on the size of the machine, whether it is enlarging processing or cutting processing is automatically discriminated, and if this discrimination is enlarging processing, it is in the longitudinal direction of the processing shape, and in the case of cutting processing, the lateral shape of the processing shape. By automatically setting the approach in each direction, the operator can automatically set the appropriate approach according to the machining without instructing the approach element for each machining, so even in machining with many shapes, etc. Processing time can be shortened and processing accuracy can be improved.

The NC data generation method for wire electric discharge machining according to the third aspect of the present invention comprises a shape design means, a machining process setting means, a discrimination means, and a scrap processing position setting means, and when a machining shape is extracted. In addition, according to the size of the shape, it is automatically determined whether it is the enlarging processing or the cutting processing. If this determination is the cutting processing, the automatic scrap processing position is automatically set when cutting the processing shape. As a result, the operator does not insert the automatic scrap processing code in editing the NC data, and the appropriate scrap processing is performed at the position immediately after the shape of the NC data is cut off. There is no need to remove the machining, the machining definition time can be shortened, and machining can be automated.

[Brief description of drawings]

FIG. 1 is a CAD / C for die design using an NC data creation method for wire electric discharge machining which is an embodiment of the present invention.
It is a block diagram which shows an AM system.

FIG. 2 is a diagram showing a wire machining path for shape machining by the NC data generating method for wire electric discharge machining which is an embodiment of the present invention.

FIG. 3 is a flow chart showing an overall machining setting operation by the method for creating NC data for wire electric discharge machining which is an embodiment of the present invention.

FIG. 4 is a view showing machining NC data by a wire electric discharge machining NC data creating method according to an embodiment of the present invention.

FIG. 5 is a diagram showing a die CAD / CAM system.

FIG. 6 is a view showing a shape omnidirectional machining.

FIG. 7 is a diagram showing uncut machining.

FIG. 8 is a diagram showing enlargement processing.

FIG. 9 is a diagram showing machining paths having a plurality of shapes.

FIG. 10 is a diagram showing an approach of cut-off processing and enlargement processing.

[Explanation of symbols]

 1 Mold CAD / CAM System 1a CAD System 1b CAM System 2 NC Data 3 Work 4 Processing Path 11a Processor 11b ROM 11c RAM 12 Graphic Display Device 13 Tablet Device 13a Tablet Surface 13b Menu Table 13c Mouse 14a Keyboard 14b XY Plotter 14c Floppy disk drive 15 Mass storage device CRT display screen DF, DF1 to DF10 Shape I1 to I10 Initial hole A1 to A7 Approach element J1 to J6 Center of gravity position

Claims (3)

[Claims] 1. A shape designing means for designing a machining shape for wire electric discharge machining; a machining step setting means for setting a machining step for each shape based on the machining shape designed by the shape designing means; A method for creating NC data for wire electric discharge machining, comprising: a discriminating unit that discriminates, when a shape is extracted, whether to perform enlarging processing or cutting processing according to the size of the shape. 2. A shape designing means for designing a machining shape for wire electric discharge machining; a machining step setting means for setting a machining step for each shape based on the machining shape designed by the shape designing means; When extracting a shape, a determination means for determining whether the processing is enlargement processing or cut-off processing according to the size of the shape, and a longitudinal direction of the processed shape when the processing determined by the determination means is enlargement processing In addition, in the case of cut-off machining, there is provided an approach setting means for setting an approach in the lateral direction of the machined shape, and a method for creating NC data for wire electric discharge machining. 3. A shape designing means for designing a machining shape for wire electric discharge machining; a machining step setting means for setting a machining step for each shape based on the machining shape designed by the shape designing means; When extracting the shape, a determination unit that determines whether the processing is enlargement processing or cutting processing according to the size of the shape, and when the processing determined by the determination unit is cutting processing,
A method for creating NC data for wire electric discharge machining, comprising: scrap processing position setting means for setting an automatic scrap processing position when cutting a machining shape.