JP2001062675A - Numerical control data creation device, numerical control data creation method, and storage medium - Google Patents

Abstract

(57) [Summary] A numerical control data generating apparatus, a numerical control data generating method, and a storage capable of eliminating man-hours required for determining a tool to be used in a numerical control data generating apparatus for cutting by a rotary tool. Provide media. SOLUTION: A tool to be used is determined based on a processing target area of a workpiece and a processing range of a target tool, and a tool to be used is determined based on a ratio of an area of a processing target area of the workpiece to an area of a processing range of the target tool. The tool to be used is determined in consideration of the absolute lowering possible area of the tool based on the processing target area of the workpiece and the processing range of the target tool, and if there is an absolute lowering area for a tool smaller in diameter than the target tool, the workpiece is Omitting the process of determining the target tool as the tool to be used based on the processing target area and the processing range of the target tool, and omitting the above-mentioned omission processing when the target tool has an absolutely descentable area, in order from the large-diameter tool to the small-diameter tool. It has a CPU 1 as a target tool.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a numerical control data generating device, a numerical control data generating method, and a storage medium.
In particular, the present invention relates to a numerical control data generation device, a numerical control data generation method, and a storage medium for realizing a method for determining a tool to be used in a cutting numerical control (NC) data generation device using a rotary tool.

[0002]

2. Description of the Related Art Conventionally, a numerical control data generating device for cutting by a rotary tool, a numerical control data generating method applied to the numerical control data generating device, and a storage medium storing the numerical control data generating method are used. When deciding, the person had decided which tool to use. Further, the tool to be used is automatically determined according to the machining amount.

[0003] The present applicant has proposed a technique described in Japanese Patent Application Laid-Open No. Hei 9-190208, which relates to an NC data generating apparatus capable of selecting a tool diameter of a rotary tool used for cutting as described above. The technology described in this publication determines an effective machining area and a tool movable area that can be machined by a rotary tool having a tool diameter of interest, a machining target area, an effective machining area, a tool movable area,
Utilizing the focused tool diameter and their area, it is determined whether a rotary tool having the focused tool diameter can be used. If the rotating tool cannot be used, a slightly smaller tool diameter is selected.

[0004] The present applicant has proposed a technique described in Japanese Patent Application Laid-Open No. Hei 6-210544 with respect to an NC data generating apparatus capable of automatically selecting an appropriate tool according to a processing location. The technique described in this publication determines a shape at the time of machining, and selects a tool having an optimum shape and a machining condition from the shape of the tool and machining conditions determined in advance from among the tool shapes and machining conditions stored in advance. is there.

[0005]

However, the above-mentioned prior art has the following problems. That is, in the prior art, a numerical control data generating device for cutting with a rotary tool, a numerical control data generating method applied to the numerical control data generating device, and a storage medium storing the numerical control data generating method are used. When determining the number of tools, a great deal of man-hours were required to determine the tool to be used. In addition, in the automatic determination of the tool to be used according to the processing amount, many tools that require preparation of a pre-drilled hole are used, and the number of man-hours for preparing a prepared hole is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and provides a numerical control data generating apparatus for cutting with a rotary tool, which is capable of eliminating man-hours required for determining a tool to be used. A first object is to provide an apparatus, a numerical control data creation method, and a storage medium.

Further, the present invention provides a numerical control data generating apparatus, a numerical control data generating method, and a storage medium which can reduce the use of tools requiring pilot hole drilling and reduce man-hours for pilot hole drilling. The second purpose is to do.

[0008]

According to one aspect of the present invention, there is provided a numerical control data generating apparatus for generating numerical control data for cutting by a rotary tool, comprising the steps of: And a determining means for determining a tool to be used based on the processing target region and the processing range of the target tool.

In order to achieve the above object, according to the present invention, the determining means uses the target tool based on a ratio of an area of a processing target area of the workpiece to an area of a processing range of the target tool. It is characterized in that it is determined to be a tool.

According to a third aspect of the present invention, there is provided a numerical control data generating apparatus for generating numerical control data for cutting by a rotary tool, wherein the numerical control data generating apparatus includes: It is characterized in that it has a deciding means for deciding a tool to be used in consideration of an absolute descendable area of the tool based on a machining range by the tool.

In order to achieve the above object, the present invention according to claim 4, wherein the determining means is configured to determine whether the tool having a smaller diameter than the focused tool has an absolute descent-possible area and the processing target area of the workpiece and the focused tool. The determination processing for determining the tool of interest as the tool to be used on the basis of the machining range according to (1) is omitted.

In order to achieve the above object, the present invention according to claim 5 is characterized in that the determining means omits the omitting process when the target tool has an absolute descent-possible area.

According to a sixth aspect of the present invention, in the present invention, the absolute descent-possible region includes a region in which the movable range of the tool is reduced by a tool radius and a region to be processed of the workpiece. It is characterized in that an area obtained by reducing the pre-processed area deeper than the processing target area by the tool radius is an overlapping area.

In order to achieve the above object, the present invention according to claim 7 is characterized in that it further comprises a tool focusing means in which the tools are focused in order from the large-diameter tool to the small-diameter tool.

In order to achieve the above object, the present invention according to claim 8 is characterized in that the tool focus means focuses on the tool data registered in advance.

In order to achieve the above object, the present invention according to claim 9 further comprises a calculating means for calculating the ratio of the area of the processing range to the sectional area of the tool of interest, and the area of the processing range by the tool of interest. Determining means for determining whether or not a predetermined ratio is satisfied with respect to the cross-sectional area of the tool, wherein the determining means determines a tool to be used based on the determination result.

In order to achieve the above object, the present invention according to claim 10 further comprises a graphic data storage means for storing graphic data of a workpiece, and a tool name and a tool diameter used for taking out the target tool. Tool data registration means for registering the associated tool data, and effective area ratio data as a criterion for determining whether or not the area of the processing range of the target tool satisfies a certain ratio with respect to the cross-sectional area of the target tool are registered. And an effective area ratio data registering means.

According to another aspect of the present invention, there is provided a numerical control data generating method applied to a numerical control data generating apparatus for generating numerical control data for cutting by a rotating tool. It is characterized by having a determining step of determining a tool to be used based on a processing target area of a workpiece and a processing range of a target tool.

According to a twelfth aspect of the present invention, in the deciding step, a target tool is used based on a ratio of an area of a processing target region of a workpiece to an area of a processing range of the target tool. It is characterized in that it is determined to be a tool.

To achieve the above object, the present invention according to claim 13 is a numerical control data generating method applied to a numerical control data generating apparatus for generating numerical control data for cutting by a rotary tool, The method further includes a determining step of determining a tool to be used in consideration of a region where the tool can be absolutely lowered based on a processing target region of the workpiece and a processing range of the target tool.

In order to achieve the above object, the present invention according to a fourteenth aspect of the present invention is that, in the determining step, when a tool smaller in diameter than the tool of interest has an absolute descent area, the area to be machined of the workpiece and the tool of interest are The determination processing for determining the tool of interest as the tool to be used on the basis of the machining range according to (1) is omitted.

In order to achieve the above object, the present invention according to claim 15 is characterized in that in the determining step, if the target tool has an absolute descent-possible area, the omission processing is omitted.

In order to achieve the above object, the present invention according to claim 16 is characterized in that the absolute descent-possible area is an area in which the movable range of the tool is reduced by the tool radius and an area to be processed of the workpiece. It is characterized in that an area obtained by reducing the pre-processed area deeper than the processing target area by the tool radius is an overlapping area.

In order to achieve the above object, the present invention according to a seventeenth aspect is characterized in that the present invention further comprises a tool focusing step in which the tools are focused in order from the large-diameter tool to the small-diameter tool.

In order to achieve the above object, the present invention according to claim 18 is characterized in that in the tool attention step, attention is paid from tool data registered in advance.

In order to achieve the above object, the present invention according to claim 19 further comprises a calculating step of calculating the ratio of the area of the processing range to the cross-sectional area of the tool of interest; A determining step of determining whether or not a predetermined ratio is satisfied with respect to the cross-sectional area of the tool; and in the determining step, a tool to be used is determined based on the determination result.

According to another aspect of the present invention, there is provided a program for executing a numerical control data generating method applied to a numerical control data generating apparatus for generating numerical control data for cutting by a rotary tool. Is a storage medium readable by a computer, wherein the numerical control data creating method has a determining step of determining a tool to be used based on a processing target area of a workpiece and a processing range of a target tool. I do.

In order to achieve the above object, according to the present invention, in the determining step, a target tool is used based on a ratio of an area of a processing target area of a workpiece to an area of a processing range of the target tool. It is characterized in that it is determined to be a tool.

In order to achieve the above object, the present invention according to claim 22 is a program for executing a numerical control data generating method applied to a numerical control data generating apparatus for generating numerical control data for cutting by a rotary tool. Is a storage medium readable by a computer storing the numerical control data, wherein the numerical control data creation method includes a tool to be used in consideration of an absolute lowering possible area of a tool based on a processing target area of a workpiece and a processing range of a target tool. It has a determining step of determining.

According to a twenty-third aspect of the present invention, in the determining step, when a tool having a smaller diameter than the focused tool has an absolute descent area, the processing target area of the workpiece and the focused tool are determined. The determination processing for determining the tool of interest as the tool to be used on the basis of the machining range according to (1) is omitted.

In order to achieve the above object, the present invention according to claim 24 is characterized in that, in the determining step, when the target tool has an absolute descent-allowable area, the omission processing is omitted.

In order to achieve the above object, the present invention according to claim 25 is characterized in that the absolute descendable area is an area in which the movable range of the tool is reduced by the tool radius and an area to be machined of the workpiece. It is characterized in that an area obtained by reducing the pre-processed area deeper than the processing target area by the tool radius is an overlapping area.

In order to achieve the above object, the present invention according to claim 26 is characterized in that the present invention further comprises a tool focusing step in which the tools are focused in order from the large-diameter tool to the small-diameter tool.

In order to achieve the above object, the present invention according to a twenty-seventh aspect is characterized in that in the tool attention step, attention is paid from among tool data registered in advance.

In order to achieve the above object, the present invention according to claim 28, further comprises a calculating step of calculating a ratio of an area of a processing range to a cross-sectional area of a tool of interest; A determining step of determining whether or not a predetermined ratio is satisfied with respect to the cross-sectional area of the tool; and in the determining step, a tool to be used is determined based on the determination result.

[0036]

Embodiments of the present invention will be described below in detail with reference to the drawings.

First, an example of the configuration of an NC data generating apparatus to which the present invention is applied will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration of an NC data creation device according to an embodiment of the present invention. The NC data creation device 10 includes a CPU 1, an input unit 2, a display unit 3, an output unit 4, a bus 5, a ROM 6, a RA
M7, a storage device 8, a communication interface 9A, and a communication interface 9B are provided. In the figure, reference numeral 20 denotes an NC machine tool, and reference numeral 21 denotes a CAD / CAM engineering workstation (EWS) 21.

The above configuration will be described in detail. The NC data creation device 10 includes a communication interface 9 as a communication means.
A, NC machine tool 2 via communication interface 9B
0 and a CAD / CAM engineering workstation (EWS) 21 are connected, and data communication is possible with each other. In the NC data creation device 10, the CP
U1 is the CAD that is the basis for creating NC data for the workpiece.
Based on the data (in the present embodiment, CAD data created in advance by CADNAMEWS 21), NC data creation processing such as calculation of a tool path and a machining shape and selection of a tool is performed.
In addition, the CPU 1 controls the input unit 2 to the communication interface 9B via the bus 5 and executes processing shown in flowcharts of FIGS. 2 and 3 described later based on a program stored in the ROM 6.

The input section 2 is for inputting data, parameters, and the like, and includes a keyboard, a mouse, and the like. The display unit 3 displays data, parameters, and the like, and includes, for example, a CRT display. The output unit 4 prints and outputs various data on paper, and is composed of a printer or the like. The ROM 6 stores a program for calculating a machining shape, selecting a tool, calculating a tool locus, and the like, fixed parameters, a tool table (FIG. 6) described later, an effective area ratio table (FIG. 8), and the like. The RAM 7 is used as a temporary storage and a working area for variable parameters and variables.

The storage device 8 is for storing CAD data of a workpiece to be created in advance, and includes a hard disk drive, a floppy disk drive, and the like. The communication interface 9 </ b> A performs data communication between the NC data creation device 10 and the NC machine tool 20. The communication interface 9 </ b> B performs data communication between the NC data creation device 10 and the CAD / CAMEWS 21. The CPU 1 to the communication interface 9B are:
It is communicably connected via a bus 5 for internal communication.

The NC machine tool 20 performs cutting based on the NC data created by the NC data creating device 10 and supplied via the communication interface 9A. CAD / C
The AMEWS 21 creates CAD data, which is a basis for creating NC data of a workpiece, in advance, and generates the NC data creating device 1
0 via the communication interface 9B.

FIG. 16 is an explanatory diagram showing a conceptual example in which the program and related data of the present invention are supplied from a storage medium to the apparatus. The program and related data of the present invention are stored in a storage medium 161 such as a floppy disk or a CD-ROM in the device 1.
It is supplied by inserting it into the storage medium drive insertion slot 163 provided at 62. After that, the program and related data of the present invention are temporarily installed on the hard disk from the storage medium 161 and loaded into the RAM from the storage medium 161, or directly loaded into the RAM without being installed on the hard disk, thereby obtaining the program and the related data of the present invention. Can be executed.

In this case, the NC according to the embodiment of the present invention
When the program of the present invention is executed in the data creating apparatus, the program and the related data of the present invention are supplied to the NC data creating apparatus according to the procedure shown in FIG. By storing the program of the invention and related data, the program can be executed.

FIG. 15 is an explanatory diagram showing a configuration example of the storage contents of the storage medium storing the program and related data of the present invention. The storage medium of the present invention is, for example, volume information 1
51, directory information 152, a program execution file 153, a program-related data file 154, and the like. The program of the present invention is program-coded based on flowcharts shown in FIGS.

The correspondence between the components in the claims of the present invention and the components in the embodiment of the present invention is as follows. The determining means, the tool focus means, the calculating means, and the determining means correspond to the CPU 1, the graphic data storing means corresponds to the storage device 8, and the tool data registering means corresponds to the ROM.
6, the effective area ratio data registration means corresponds to the effective area ratio table of the ROM 6.

Next, an example of the operation of the NC data creating apparatus according to the embodiment of the present invention configured as described above will be described with reference to FIG. 1 and FIGS.

First, the flow of the operation of the NC data creating apparatus according to the embodiment of the present invention having the above configuration is shown in FIGS.
A description will be given based on FIG. FIG. 2 to FIG. 4 are flowcharts of the used tool determination processing according to the embodiment of the present invention.

First, in step S21, the CPU 1 of the NC data generating device extracts a processing target area from the graphic data of the workpiece stored in the storage device 8. Next, step S
At 22, the CPU 1 calculates the area of the processing target area. Next, in step S23, the CPU 1 extracts the tool having the largest tool diameter from the tool table (FIG. 6) stored in the ROM 6 as the target tool. Next, in step S24, C
PU1 calculates the cross-sectional area of the tool of interest. Next, step S
At 25, the CPU 1 calculates the processing range of the target tool in the processing target area. Next, in step S26, the CPU 1 calculates the area of the processing range.

Next, in step S27, the CPU 1 calculates the ratio of the processing area to the tool sectional area (processing area ratio 1). Next, in step S28, the CPU 1
Is extracted from the effective area ratio table (FIG. 8) stored in the table. Next, in step S29, the CPU
1 is skipped to step S224 when the processing area ratio 1 is equal to or more than the effective area ratio 1 (the area of the processing range by the target tool satisfies a certain ratio with respect to the cross-sectional area of the target tool). Next, in step S210, the CPU 1 calculates a movable area of the target tool in the processing target area. Next, in step S211, the CPU 1 calculates a tool movable reduced area obtained by reducing the tool movable area by the focused tool radius.

Next, in step S212, the CPU 1 takes out a pre-processed area which is located in the processing target area of the workpiece and has been processed deeper than the processing target area previously. Next, step S2
In step 13, the pre-processing reduced area obtained by reducing the pre-processing area by the focused tool radius is extracted. Next, in step S214, the CPU 1
If there is an absolutely descendable area where the tool movable reduction area and the pre-processing reduction area overlap (preparation of the prepared tool is not required to lower the target tool to the height of the processing target area), the process skips to step S220.

Next, in step S215, the CPU 1 sets the RO
From the tool table (FIG. 6) stored in M6, the next smaller tool having a tool diameter one rank smaller than the tool diameter of the target tool is extracted. Next, in step S216, the CPU 1 calculates the next small-diameter tool movable area of the next small-diameter tool in the processing target area. Next, in step S217, the CPU 1 calculates the next small-diameter tool movable reduced area obtained by reducing the next small-diameter tool movable area by the next small-diameter tool radius. Next, in step S218, the CPU 1
Extracts a pre-processing next small diameter reduced area obtained by reducing the pre-processing area by the next small diameter tool radius. Next, in step S219, the CPU
1 indicates a case where there is a next-small-diameter absolute descendable area where the next-small-diameter tool movable reduction area and the pre-processing next-small-diameter reduction area overlap (preparation of the next small-diameter tool is not required to lower the tool to the height of the processing target area). , And skips to step S223.

Next, in step S220, the CPU 1 calculates the ratio of the processing range area to the processing target area (processing area ratio 2). Next, in step S221, the CPU 1
Extracts the effective area ratio 2 from the effective area ratio table (FIG. 8) stored in the ROM 6. Next, step S2
In step S22, if the processing area ratio 2 is equal to or more than the effective area ratio 2 (the area of the processing range with the target tool satisfies a certain ratio with respect to the area of the processing target area), the CPU 1 proceeds to step S22.
Skip to 4. Next, in step S223, the CPU 1
Is obtained from the tool table (FIG. 6) stored in the ROM 6.
A tool having a tool diameter one rank smaller than the current tool diameter of the focused tool is taken out as the focused tool, and the process returns to step S24.
Next, in step S224, the CPU 1 determines to use the current target tool for processing the processing target area, and ends the processing.

Next, a specific example of the operation of the NC data creating apparatus according to the embodiment of the present invention having the above configuration will be described with reference to FIG.
This will be described with reference to FIG. FIG. 5 is an explanatory diagram showing graphic data and a processing target area according to the embodiment of the present invention. FIG. 6 is an explanatory diagram showing a tool table according to the embodiment of the present invention.
FIG. 7 is an explanatory diagram showing graphic data, a processing range of a φ10 end mill, and a section of a φ10 end mill according to the embodiment of the present invention. FIG. 8 is an explanatory diagram showing an effective area ratio table according to the embodiment of the present invention. FIG. 10 is an explanatory view showing the graphic data according to the embodiment of the present invention, the tool movable area and the tool movable reduced area of the φ10 end mill, and FIG. 10 is the graphic data according to the embodiment of the present invention, the pre-processing area of the φ10 end mill and the front. It is explanatory drawing which shows a process reduction area.

FIG. 11 is an explanatory view showing graphic data according to the embodiment of the present invention and an absolute descent area of the φ10 end mill, and FIG. 12 is graphic data according to the embodiment of the present invention and a movable tool of the φ6 end mill. FIG. 13 is an explanatory view showing an area and a tool movable reduction area, FIG. 13 is an explanatory view showing graphic data and a pre-processing area and a pre-processing reduction area of a φ6 end mill according to an embodiment of the present invention, and FIG. 14 is an embodiment of the present invention. FIG. 4 is an explanatory diagram showing the graphic data according to FIG.

First, the processing target area 31 is extracted from the graphic data (FIG. 5) of the workpiece in the CAD graphic file.
Next, the area of the processing target region 31: 62.832 [m
m ² ]. Next, the tool having the largest tool diameter: φ10 end mill is taken out from the tool table (FIG. 6) as the target tool. Next, the target tool: the area of the cross section 50 of the φ10 end mill: 78.540 [mm ² ] is calculated. Next, the processing range 51 of the target tool: φ10 end mill in the processing target area 31 is calculated. Next, an area of the processing range 51: 62.832 [mm ² ] is calculated. Next, focused tool: area of section 50 of φ10 end mill: 78.54
Area of processing range 51 with respect to 0 [mm ² ]: 62.83
The ratio of 2 [mm ² ] (processing area ratio 1): 0.800 is calculated.

Next, the effective area ratio 1: 2.000 is extracted from the effective area ratio table (FIG. 8). In this case, the processing area ratio 1: 0.800 becomes the effective area ratio 1: 2.00
Not greater than or equal to 0 (tool of interest: area of processing range 51 by φ10 end mill: 62.832 [mm ² ] is tool of interest:
Area of cross section 50 of φ10 end mill: 78.540 [m]
m ² ] does not satisfy a certain ratio: 2.000 times)
So proceed to the next. Next, the movable area 71 of the tool of interest: φ10 end mill in the processing target area 31 is calculated. Next, a tool movable reduced area 711 obtained by reducing the tool movable area 71 by a focused tool radius: 5 [mm] is calculated.

Next, a pre-processed area 81 which is located in the processing target area 31 of the workpiece and has been processed deeper than the processing target area previously is taken out. Next, a pre-processing reduced area (which disappears and does not exist) obtained by reducing the pre-processing area 81 by a focused tool radius: 5 [mm] is extracted. In this case, the tool movable reduction area 711
There is no absolute descendable area where the pre-processing reduced area (disappears and does not exist) overlaps (tool of interest: pilot hole drilling is required to lower the φ10 end mill to the height of the processing target area 31) So proceed to the next. Next, from the tool table (FIG. 6), the tool of interest: the tool diameter of the φ10 end mill:
Tool diameter one rank smaller than 10 [mm]: 6 [mm]
Next small diameter tool: Take out φ6 end mill.

Next, the next small diameter tool movable area 101 of the next small diameter tool: φ6 end mill in the processing target area 31 is calculated. Next, the next small-diameter tool movable area 101 is reduced by the next small-diameter tool radius: 3 [mm].
1 is calculated. Next, the pre-processing next small-diameter reduced area 1111 in which the pre-processing area 111 is reduced by the next small-diameter tool radius: 3 [mm].
Take out. In this case, the next small-diameter tool movable reduction area 101
Since there is a next small diameter absolute descendable area 121 where 1 and the pre-machining next small diameter reduced area 1111 overlap (the next small diameter tool: it is not necessary to prepare a pilot hole to lower the φ6 end mill to the height of the processing target area 31). Next. Next, from the tool table (FIG. 6), the tool of interest: the tool diameter of one rank smaller than the tool diameter of the φ10 end mill: 10 [mm]: 6
[Mm] tool: φ6 end mill is taken out as a target tool, and similarly determined.

Next, the processing target area 32 is extracted from the graphic data (FIG. 5) of the workpiece in the CAD graphic file.
Next, the area of the processing target region 32: 18.064 [m
m ² ]. Next, the tool having the largest tool diameter: φ10 end mill is taken out from the tool table (FIG. 6) as the target tool. Next, the target tool: the area of the cross section 50 of the φ10 end mill: 78.540 [mm ² ] is calculated. Next, the processing range 52 of the target tool: φ10 end mill in the processing target area 32 is calculated. Next, the area of the processing range 52: 18.064 [mm ² ] is calculated. Next, focused tool: area of section 50 of φ10 end mill: 78.54
Area of machining range 52 with respect to 0 [mm ² ]: 18.06
The ratio of 4 [mm ² ] (processing area ratio 1): 0.230 is calculated.

Next, the effective area ratio 1: 2.000 is extracted from the effective area ratio table (FIG. 8). In this case, the processing area ratio 1: 0.230 is the effective area ratio 1: 2.00
Not more than 0 (tool of interest: area of machining range 52 by φ10 end mill: 18.064 [mm ² ] is tool of interest:
Area of cross section 50 of φ10 end mill: 78.540 [m]
m ² ] does not satisfy a certain ratio: 2.000 times)
So proceed to the next. Next, the movable area 72 of the tool of interest: φ10 end mill in the processing target area 32 is calculated. Next, a tool movable reduced area 722 in which the tool movable area 72 is reduced by a focused tool radius: 5 [mm] is calculated.

Next, a pre-processed area 82 which is located in the processed area 32 of the workpiece and has been processed deeper than the previously processed area is extracted. Next, a pre-processing reduced area 822 obtained by reducing the pre-processing area 82 by a focused tool radius: 5 [mm] is extracted. In this case, there is an absolutely descendable area 92 where the tool movable reduction area 722 and the pre-processing reduction area 822 overlap (the tool of interest: pilot hole drilling is not required to lower the φ10 end mill to the height of the processing target area 32). So proceed to the next. Next, the area of the processing target region 32: 18.064 [m
m ² ], the area of the processing range 52: 18.064 [m
m ² ] (processing area ratio 2): 1.000 is calculated.

Next, the effective area ratio 1: 0.800 is extracted from the effective area ratio table (FIG. 8). In this case, the processing area ratio 2: 1.000 is the effective area ratio 2: 0.80.
0 or more (tool of interest: machining range 5 with φ10 end mill)
Area of 2: 18.064 [mm ² ] is processing area 32
Area: 18.064 [mm ² ], constant ratio:
0.800 times), so that it is decided to use the current focused tool: φ10 end mill for machining the machining target area 32.

Next, the processing target area 33 is extracted from the graphic data (FIG. 5) of the workpiece in the CAD graphic file.
Next, the area of the processing target region 33: 263.894 [mm]
² ] is calculated. Next, the tool having the largest tool diameter: φ10 end mill is taken out from the tool table (FIG. 6) as the target tool. Next, the target tool: the area of the cross section 50 of the φ10 end mill: 78.540 [mm ² ] is calculated. Next, the processing range 53 of the tool of interest: φ10 end mill in the processing target area 33 is calculated. Next, an area of the processing range 53: 263.894 [mm ² ] is calculated. Next, tool of interest: area of section 50 of φ10 end mill: 78.5
Area of the processing range 53 with respect to 40 [mm ² ]: 263.
894 [mm ² ] ratio (processing area ratio 1): 3.36
Calculate 0.

Next, the effective area ratio 1: 2.000 is extracted from the effective area ratio table (FIG. 8). In this case, the processing area ratio 1: 3.360 becomes the effective area ratio 1: 2.00.
0 or more (tool of interest: machining range 5 with φ10 end mill)
Area of No. 3: 263.894 [mm ² ] is the tool of interest: φ1
Area of cross section 50 of end mill 0: 78.540 [m]
m ² ] with a fixed ratio of 2.000 times), so that the current tool of interest: φ10
Decide to use an end mill.

Next, the processing target area 34 is extracted from the graphic data (FIG. 5) of the workpiece in the CAD graphic file.
Next, the area of the processing target region 34: 93.462 [m
m ² ]. Next, the tool having the largest tool diameter: φ10 end mill is taken out from the tool table (FIG. 6) as the target tool. Next, the target tool: the area of the cross section 50 of the φ10 end mill: 78.540 [mm ² ] is calculated. Next, the processing range 54 of the tool of interest: φ10 end mill in the processing target area 34 is calculated. Next, an area of the processing range 54: 93.462 [mm ² ] is calculated. Next, focused tool: area of section 50 of φ10 end mill: 78.54
Area of the processing range 54 with respect to 0 [mm ² ]: 93.46
The ratio of 2 [mm ² ] (processing area ratio 1): 1.190 is calculated.

Next, the effective area ratio 1: 2.000 is extracted from the effective area ratio table (FIG. 8). In this case, the processing area ratio 1: 1.190 becomes the effective area ratio 1: 2.00
Not greater than or equal to 0 (Tool of interest: Area of machining range 54 by φ10 end mill: 93.462 [mm ² ] Tool of interest:
Area of cross section 50 of φ10 end mill: 78.540 [m]
m ² ] does not satisfy a certain ratio: 2.000 times)
So proceed to the next. Next, the movable area 74 of the tool of interest: φ10 end mill in the processing target area 34 is calculated. Next, a tool movable reduced area 744 obtained by reducing the tool movable area 74 by a focused tool radius: 5 [mm] is calculated.

Next, a pre-processed region 84 which is located in the processed region 34 of the workpiece and has been processed deeper than the previously processed region is extracted. Next, a pre-processing reduced area (which disappears and does not exist) obtained by reducing the pre-processing area 84 by a focused tool radius: 5 [mm] is extracted. In this case, the tool movable reduction area 744
There is no absolute descendable area where the pre-processing reduced area (disappears and does not exist) overlaps (tool of interest: pilot hole drilling is required to lower the φ10 end mill to the height of the processing target area 34) So proceed to the next. Next, from the tool table (FIG. 6), the tool of interest: the tool diameter of the φ10 end mill:
Tool diameter one rank smaller than 10 [mm]: 6 [mm]
Next small diameter tool: Take out φ6 end mill.

Next, the next small diameter tool movable area 104 of the next small diameter tool: φ6 end mill in the processing target area 34 is calculated. Next, the next small-diameter tool movable area 104 is reduced by reducing the next small-diameter tool movable area 104 by the next small-diameter tool radius: 3 [mm].
4 is calculated. Next, a pre-processing next small-diameter reduced area (disappearing and not present) obtained by reducing the pre-processing area 114 by the next small-diameter tool radius: 3 [mm] is extracted. In this case, there is no next-small-diameter absolute descendable area where the next-small-diameter tool movable reduction area 1044 overlaps the pre-processing next-small-diameter reduction area (disappears and does not exist). In order to lower it down, a pilot hole processing is required)
Next. Next, the area of the processing target region 34: 93.46
Area of the processing range 54 with respect to 2 [mm ² ]: 93.46
The ratio of 2 [mm ² ] (processing area ratio 2): 1.000 is calculated.

Next, the effective area ratio 2: 0.800 is extracted from the effective area ratio table (FIG. 8). In this case, the processing area ratio 2: 1.000 is the effective area ratio 2: 0.80.
0 or more (tool of interest: machining range 5 with φ10 end mill)
Area of No. 4: 93.462 [mm ² ] is the processing target area 34
Area: 93.462 [mm ² ] and a fixed ratio:
Therefore, it is determined that the current tool of interest: φ10 end mill is used for processing the processing target area 34.

Next, the processing target area 35 is extracted from the graphic data (FIG. 5) of the workpiece in the CAD graphic file.
Next, the area of the processing target area 35: 212.365 [mm]
² ] is calculated. Next, the tool having the largest tool diameter: φ10 end mill is taken out from the tool table (FIG. 6) as the target tool. Next, the target tool: the area of the cross section 50 of the φ10 end mill: 78.540 [mm ² ] is calculated. Next, the processing range 55 of the target tool: φ10 end mill in the processing target area 35 is calculated. Next, the area of the processing range 55: 93.462 [mm ² ] is calculated. Next, focused tool: area of section 50 of φ10 end mill: 78.54
Area of the processing range 55 with respect to 0 [mm ² ]: 93.46
The ratio of 2 [mm ² ] (processing area ratio 1): 1.190 is calculated.

Next, the effective area ratio 1: 2.000 is extracted from the effective area ratio table (FIG. 8). In this case, the processing area ratio 1: 1.190 becomes the effective area ratio 1: 2.00
Not greater than or equal to 0 (Tool of interest: Area of machining range 55 by φ10 end mill: 93.462 [mm ² ])
Area of cross section 50 of φ10 end mill: 78.540 [m]
m ² ] does not satisfy a certain ratio: 2.000 times)
So proceed to the next. Next, a movable area 75 of the tool of interest: φ10 end mill in the processing target area 35 is calculated. Next, a tool movable reduced area 755 obtained by reducing the tool movable area 75 by a focused tool radius: 5 [mm] is calculated.

Next, a pre-processed area 85 which is located in the processed area 35 of the workpiece and has been processed deeper than the previously processed area is extracted. Next, a pre-processing reduced area (which disappears and does not exist) obtained by reducing the pre-processing area 85 by a focused tool radius: 5 [mm] is extracted. In this case, the tool movable reduction area 755
There is no absolute descent area where the pre-process reduction area (disappears and does not exist) overlaps (the target tool: pilot hole drilling is required to lower the φ10 end mill to the height of the processing target area 35) So proceed to the next. Next, from the tool table (FIG. 6), the tool of interest: the tool diameter of the φ10 end mill:
Tool diameter one rank smaller than 10 [mm]: 6 [mm]
Next small diameter tool: Take out φ6 end mill.

Next, the next small diameter tool movable area 105 of the next small diameter tool: φ6 end mill in the processing target area 35 is calculated. Next, the next small-diameter tool movable area 105 is reduced by reducing the next small-diameter tool movable area 105 by the next small-diameter tool radius: 3 [mm].
5 is calculated. Next, the pre-processing next small-diameter reduced area (extinction and non-existence) in which the pre-processing area 115 is reduced by the next small-diameter tool radius: 3 [mm] is taken out. In this case, there is no next-small-diameter absolute descendable area where the next-small-diameter tool movable reduction area 1055 overlaps the pre-processing next-small-diameter reduction area (disappears and does not exist). In order to lower it down, a pilot hole processing is required)
Next. Next, the area of the processing target area 35: 212.3
Area of processing range 55 with respect to 65 [mm ² ]: 93.4
62 [mm ² ] ratio (processing area ratio 2): 0.440
Is calculated.

Next, the effective area ratio 2: 0.800 is extracted from the effective area ratio table (FIG. 8). In this case, the processing area ratio 2: 0.440 becomes the effective area ratio 2: 0.80
Not greater than zero (focused tools: the area of the working range 55 by φ10 End Mill: 93.462 area [mm ^2] is the processing target area 35: 212.365 constant rate with respect to [mm ^2]: 0.800 times the met No) so proceed to the next. Next, from the tool table (FIG. 6), the current target tool: φ1
0 end mill tool diameter: 10 [mm] tool rank: 1 rank smaller tool diameter: 6 [mm] tool: φ6 end mill is taken out as a target tool, and similarly determined.

Next, the processing target area 36 is extracted from the graphic data (FIG. 5) of the workpiece in the CAD graphic file.
Next, the area of the processing target region 36: 24.000 [m
m ² ]. Next, the tool having the largest tool diameter: φ10 end mill is taken out from the tool table (FIG. 6) as the target tool. Next, the target tool: the area of the cross section 50 of the φ10 end mill: 78.540 [mm ² ] is calculated. Next, the processing range 56 of the target tool: φ10 end mill in the processing target area 36 is calculated. Next, an area of the processing range 56: 24.000 [mm ² ] is calculated. Next, focused tool: area of section 50 of φ10 end mill: 78.54
Area of the processing range 56 with respect to 0 [mm ² ]: 24.00
The ratio of 0 [mm ² ] (processing area ratio 1): 0.306 is calculated.

Next, the effective area ratio 1: 2.000 is extracted from the effective area ratio table (FIG. 8). In this case, the processing area ratio 1: 0.306 becomes the effective area ratio 1: 2.00
0 or more (Tool of interest: Area of machining range 56 by φ10 end mill: 24.000 [mm ² ] Tool of interest:
Area of cross section 50 of φ10 end mill: 78.540 [m]
m ² ] does not satisfy a certain ratio: 2.000 times)
So proceed to the next. Next, the movable area 76 of the tool of interest: φ10 end mill in the processing target area 36 is calculated. Next, the tool movable reduced area 766 is calculated by reducing the tool movable area 76 by the focused tool radius: 5 [mm].

Next, a pre-processing area 86 which is located in the processing target area 36 of the workpiece and has been processed deeper than the processing target area previously is taken out. Next, the pre-processing reduced area 866 obtained by reducing the pre-processing area 86 by the focused tool radius: 5 [mm] is extracted. In this case, there is an absolute descendable area 96 where the tool movable reduction area 766 and the pre-processing reduction area 866 overlap (the tool of interest: the pilot hole drilling is not necessary to lower the φ10 end mill to the height of the processing target area 36). So proceed to the next. Next, the area of the processing target region 36: 24.000 [m
m ² ], the area of the processing range 56: 24.000 [m
m ² ] (processing area ratio 2): 1.000 is calculated.

Next, the effective area ratio 2: 0.800 is extracted from the effective area ratio table (FIG. 8). In this case, the processing area ratio 2: 1.000 is the effective area ratio 2: 0.80.
0 or more (tool of interest: machining range 5 with φ10 end mill)
Area of 6: 24.000 [mm ² ] is the processing target area 36
Area: 24.000 [mm ² ] fixed ratio:
Therefore, it is determined that the current target tool: φ10 end mill is used for machining the machining target area 36.

As described above, according to the NC data generating apparatus according to the embodiment of the present invention, the storage device 8 storing the graphic data of the workpiece in the CAD graphic file, the tool table, and the effective area ratio table ROM6 that stores
And, the tool to be used is determined based on the processing target area of the workpiece and the processing range of the target tool, and the tool to be used is determined based on the ratio of the area of the processing target area of the workpiece to the processing area of the target tool, The tool to be used is determined in consideration of the absolute descent area of the tool based on the processing target area of the workpiece and the processing range of the target tool, and if there is an absolute descent area for a tool with a smaller diameter than the target tool, processing of the workpiece Omitting the process of determining the target tool as the tool to be used based on the target area and the machining range of the target tool, and omitting the above omission processing when the target tool has an absolutely descentable area, and observing the target tool in order from the large-diameter tool to the small-diameter tool. Therefore, the following operations and effects can be obtained.

In the NC data creating apparatus for cutting with a rotary tool, the CPU 1 determines a tool to be used based on a machining target area of a workpiece and a machining range of a focused tool. Thereby, a tool to be used can be determined according to the machining amount.

The CPU 1 determines the target tool as the tool to be used based on the ratio of the area of the processing target area of the workpiece to the area of the processing range of the target tool. Thus, the processing amount can be calculated based on the area of the processing range.

Further, the CPU 1 determines a tool to be used in consideration of an area where the tool can be absolutely lowered based on a processing target area of the workpiece and a processing range of the target tool. Thus, the tool to be used can be determined in consideration of the absolute descent-possible region. That is,
The necessity / unnecessity of drilling holes can be considered.

Further, when there is an absolutely descentable area for a tool smaller in diameter than the target tool, the CPU 1 omits the determination processing for determining the target tool as the tool to be used based on the processing target area of the workpiece and the processing range of the target tool. Thus, it is possible to consider whether or not the small-diameter tool has an absolute descendable area.

When the target tool has an absolute descent-possible area, the CPU 1 omits the above-mentioned omission processing. This allows
The presence / absence of an absolute descent-possible area in the target tool can be considered.

The absolute lowering possible area is obtained by reducing the movable range of the tool by the tool radius, and reducing the pre-processed area deeper than the processing target area in the processing target area of the workpiece by the tool radius. The area is an overlapping area. This makes it possible to determine whether or not there is an absolute descent-possible area.

The CPU 1 sets the tools of interest in order from the large-diameter tool to the small-diameter tool. Thereby, the tools can be focused on in order from the large diameter to the small diameter.

The CPU 1 checks the tool from the tool table in the ROM 6. Thereby, the tool can be focused on from the tools registered in advance.

Therefore, in the numerical control data generating apparatus for cutting with a rotary tool, there is an effect that the number of man-hours required for determining the tool to be used can be eliminated. Also,
This has the effect of reducing the use of tools that require pilot hole drilling and reducing man-hours for pilot hole drilling.

The present invention may be applied to a system composed of a plurality of devices or an apparatus composed of one device. A storage medium storing software program codes for realizing the functions of the above-described embodiments is supplied to a system or an apparatus, and a computer (or CPU or MPU) of the system or the apparatus executes the program code stored in the storage medium. Needless to say, this can also be achieved by executing the reading.

In this case, the program code itself read from the storage medium implements the functions of the above-described embodiment, and the storage medium storing the program code constitutes the present invention.

Examples of the storage medium for supplying the program code include a floppy disk, hard disk, optical disk, magneto-optical disk, CD-ROM, and CD.
-R, a magnetic tape, a nonvolatile memory card, a ROM, or the like can be used.

Further, when the computer executes the readout program code, not only the functions of the above-described embodiment are realized, but also the OS or the like running on the computer is actually executed based on the instruction of the program code. It goes without saying that a part or all of the above-described processing is performed, and the functions of the above-described embodiments are realized by the processing.

Further, after the program code read from the storage medium is written into a memory provided on a function expansion board inserted into the computer or a function expansion unit connected to the computer, based on the instructions of the program code, It goes without saying that the CPU included in the function expansion board or the function expansion unit performs part or all of the actual processing, and the processing realizes the functions of the above-described embodiments.

[0094]

As described above, claims 1 to 10 are provided.
According to the numerical control data generation device described above, in the numerical control data generation device for cutting using a rotary tool, there is an effect that the number of steps required to determine a tool to be used can be eliminated. In addition, there is an effect that the use of tools that require pilot hole machining can be reduced, and the number of man-hours for pilot hole machining can be reduced.

According to the numerical control data generating method of the present invention, by applying the numerical control data generating method to the numerical control data generating apparatus, it is possible to determine the tool to be used in the same manner as described above. Eliminating man-hours, reducing the use of tools that require pilot holes,
This has the effect of reducing the number of man-hours for drilling pilot holes.

According to the storage medium of the present invention, the method for generating numerical control data is read from the storage medium and executed by the numerical control data generating apparatus, so that the tool to be used can be determined similarly to the above. It is possible to eliminate the number of man-hours to be generated, to reduce the use of tools that require pilot hole machining, and to reduce the number of man-hours for pilot hole machining.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an NC data creation device according to an embodiment of the present invention.

FIG. 2 is a flowchart showing a used tool determination process according to the embodiment of the present invention.

FIG. 3 is a flowchart showing a used tool determining process according to the embodiment of the present invention.

FIG. 4 is a flowchart showing a used tool determination process according to the embodiment of the present invention.

5A and 5B are diagrams showing graphic data and a processing target area according to the embodiment of the present invention, wherein FIG. 5A is a front view and FIG. 5B is a bottom view.

FIG. 6 is an explanatory diagram showing a tool table according to the embodiment of the present invention.

FIG. 7 shows graphic data and φ10 according to the embodiment of the present invention.
It is explanatory drawing which shows the processing range of an end mill, and a φ10 end mill cross section.

FIG. 8 is an explanatory diagram showing an effective area ratio table according to the embodiment of the present invention.

FIG. 9 is a diagram showing a relationship between graphic data and φ10 according to the embodiment of the present invention.
It is explanatory drawing which shows the tool movable area | region of an end mill, and a tool movable reduced area | region.

FIG. 10 shows graphic data and φ1 according to the embodiment of the present invention.
It is explanatory drawing which shows the pre-processing area | region of 0 end mills, and the pre-processing reduction area | region.

FIG. 11 shows graphic data and φ1 according to the embodiment of the present invention.
It is explanatory drawing which shows the absolute descent possible area | region of 0 end mills.

FIG. 12 shows graphic data and φ6 according to the embodiment of the present invention.
It is explanatory drawing which shows the tool movable area | region of an end mill, and a tool movable reduced area | region.

FIG. 13 shows graphic data and φ6 according to the embodiment of the present invention.
It is explanatory drawing which shows the pre-processing area | region of an end mill, and the pre-processing reduction area | region.

FIG. 14 is a diagram showing the relationship between the graphic data and φ6 according to the embodiment of the present invention.
It is explanatory drawing which shows the absolute descent possible area | region of an end mill.

FIG. 15 is an explanatory diagram showing a configuration example of storage contents of a storage medium storing a program and related data of the present invention.

FIG. 16 is an explanatory diagram showing a conceptual example in which a program and related data of the present invention are supplied from a storage medium to an apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CPU 6 ROM 8 Storage device 10 NC data creation device 20 NC machine tool 21 CAD / CAMES

Claims (28)

[Claims] 1. A numerical control data generating apparatus for generating numerical control data for cutting by a rotary tool, comprising a determining means for determining a tool to be used based on a processing target area of a workpiece and a processing range of a target tool. A numerical control data creation device, characterized in that: 2. The numerical value according to claim 1, wherein said determining means determines the target tool as a tool to be used based on a ratio of an area of a processing target area of the workpiece to an area of a processing range of the target tool. Control data creation device. 3. A numerical control data generating apparatus for generating numerical control data for cutting by a rotary tool, wherein the numerical control data generating apparatus considers an absolute descendable area of a tool based on a processing target area of a workpiece and a processing range of a target tool. A numerical control data generating apparatus, comprising: a determining means for determining a tool to be used. 4. A determining process for determining a target tool as a tool to be used based on a processing target area of a workpiece and a processing range of the target tool when an absolute descendable area is present in a tool smaller in diameter than the target tool. 4. The numerical control data creation device according to claim 3, wherein the numerical control data is omitted. 5. The numerical control data creating apparatus according to claim 4, wherein said determining means omits said omission processing when the target tool has an absolute descent-possible area. 6. The absolute descendable area includes an area in which the movable range of the tool is reduced by the tool radius, and a pre-processed area deeper than the processing target area in the processing target area of the workpiece by the tool radius. 6. The numerical control data creation device according to claim 3, wherein the reduced areas are overlapping areas. 7. The numerical control data creating apparatus according to claim 1, further comprising a tool focusing unit that sets a focused tool in order from a large-diameter tool to a small-diameter tool. 8. The numerical control data creating apparatus according to claim 7, wherein said tool focus unit focuses on the tool data registered in advance. 9. A calculating means for calculating the ratio of the area of the processing range to the cross-sectional area of the tool of interest, and determining whether the area of the processing range of the tool of interest satisfies a certain ratio with respect to the cross-sectional area of the tool of interest. The numerical control data creation device according to any one of claims 1 to 8, further comprising a determination unit, wherein the determination unit determines a tool to be used based on the determination result. 10. A graphic data storage means for storing graphic data of a workpiece, a tool data registration means for registering tool data associated with a tool name and a tool diameter used for taking out the target tool, Effective area ratio data registering means for registering effective area ratio data as a criterion for judging whether or not the area of the processing range of the target tool satisfies a certain ratio with respect to the cross-sectional area of the target tool. Item 10. The numerical control data creation device according to any one of Items 1 to 9. 11. A numerical control data generating method applied to a numerical control data generating apparatus for generating numerical control data for cutting by a rotary tool, wherein the numerical control data generating method is based on a processing target area of a workpiece and a processing range of a target tool. A numerical control data creation device, comprising a determining step of determining a tool to be used. 12. The numerical value according to claim 11, wherein in the determining step, the target tool is determined as a tool to be used based on a ratio of an area of a processing target area of the workpiece to an area of a processing range of the target tool. Control data creation method. 13. A numerical control data generating method applied to a numerical control data generating apparatus for generating numerical control data for cutting by a rotary tool, wherein the numerical control data generating method is based on a processing target area of a workpiece and a processing range of a target tool. A numerical control data generation method, comprising a determining step of determining a tool to be used in consideration of an absolute descent-possible region of the tool. 14. In the determining step, when there is an absolute descent area for a tool smaller in diameter than the target tool, a determining process of determining the target tool as a tool to be used based on the processing target area of the workpiece and the processing range of the target tool. 14. The numerical control data creation method according to claim 13, wherein step (a) is omitted. 15. The numerical control data creating method according to claim 14, wherein in the determining step, when the target tool has an absolute descent-possible area, the omission processing is omitted. 16. The absolute descendable area includes an area obtained by reducing the movable range of the tool by the tool radius, and a pre-processed area deeper than the processing target area in the processing target area of the workpiece by the tool radius. 16. The numerical control data creating method according to claim 13, wherein the reduced areas are overlapping areas. 17. The numerical control data creating method according to claim 11, further comprising a tool focusing step in which a tool is focused in order from a large-diameter tool to a small-diameter tool. 18. The numerical control data creation method according to claim 17, wherein in the tool attention step, attention is paid from tool data registered in advance. 19. A calculating step of calculating the ratio of the area of the processing range to the cross-sectional area of the tool of interest, and determining whether the area of the processing range of the tool of interest satisfies a certain ratio with respect to the cross-sectional area of the tool of interest. Determining step,
19. The numerical control data creating method according to claim 11, wherein in the determining step, a tool to be used is determined based on the determination result. 20. A storage medium readable by a computer storing a program for executing a numerical control data creation method applied to a numerical control data creation device for creating numerical control data for cutting by a rotary tool, wherein: A storage medium characterized in that the numerical control data creation method has a determining step of determining a tool to be used based on a processing target area of a workpiece and a processing range of a target tool. 21. The storage according to claim 20, wherein, in the determining step, the tool of interest is determined as a tool to be used based on a ratio of an area of a processing target area of the workpiece to an area of a processing range of the tool of interest. Medium. 22. A storage medium readable by a computer storing a program for executing a numerical control data generating method applied to a numerical control data generating apparatus for generating numerical control data for cutting by a rotary tool, wherein: A storage medium, characterized in that the numerical control data creating method includes a determining step of determining a tool to be used in consideration of an absolute lowering possible area of a tool based on a processing target area of a workpiece and a processing range of a target tool. 23. In the determining step, when there is an absolute descent area for a tool smaller in diameter than the focused tool, a determining process of determining the focused tool as a tool to be used based on a processing target area of a workpiece and a processing range of the focused tool. 23. The storage medium according to claim 22, wherein the storage medium is omitted. 24. The storage medium according to claim 23, wherein in the determining step, when the target tool has an absolute descent-possible area, the omission processing is omitted. 25. The absolute descendable area includes an area obtained by reducing a movable range of a tool by a tool radius, and a pre-processed area deeper than the processing target area in a processing target area of a workpiece by a tool radius. 25. The storage medium according to claim 22, wherein the reduced area is an overlapping area. 26. The storage medium according to claim 20, further comprising a tool focusing step in which a tool is focused in order from a large-diameter tool to a small-diameter tool. 27. The storage medium according to claim 26, wherein in the tool focus step, focus is taken from tool data registered in advance. 28. A calculating step of calculating a ratio of an area of a processing range to a cross-sectional area of a target tool, and determining whether an area of a processing range of the target tool satisfies a certain ratio with respect to a cross-sectional area of the target tool. Determining step,
28. The storage medium according to claim 20, wherein in the determining step, a tool to be used is determined based on the determination result.