JPH10105222A - Numerical control data generating method for boring and numerical control data generating device for boring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a boring numerical control data generating method and boring numerical control data generating device which automatically generate NC(numerical control) data from CAD(computer aided design) data. SOLUTION: In a step SC1, user-defined data are read in and hole data are extracted. In a step SC3, the machining process of the extracted hole data are expanded into at least one process element wherein a tool kind, etc., are entered. In a step SC4, a machining tool corresponding to the tool kind is specified according to the diameter and depth of the hole data. In a step SC5, machining depth is made to correspond to each process element according to the depth of the extracted hole data and the machining tool. In a step SC6, a fixed cycle characteristic of an NC machine tool is specified for each process element. Then NC data are generated in a step SC9 on the basis of respective process elements.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a CAD (computer).
NC based on hole data in aided design) data
The present invention relates to a method for creating numerical control data for drilling, which creates data, and an apparatus for creating numerical control data for drilling.

[0002]

2. Description of the Related Art Usually, a mold or the like is designed using CAD, and NC data is created based on the created CAD data. This CAD data usually contains hole data representing the shape of a hole or the like into which a bolt or the like is inserted. FIG. 14 is a flowchart showing a conventional method for creating numerical control data for drilling. In FIG. 14, in step SA1, C
A process of importing the AD data into a hole control numerical control data creation device (not shown) is performed. Further, since the CAD data usually contains data such as a straight line and a curve to be separately processed in addition to the hole data, next, only the hole data is extracted. No information indicating the depth of the hole is added to this hole data.

In step SA2, the operator instructs the NC machine tool (not shown) for processing a workpiece to the numerical control data creating apparatus for drilling. The NC machine tool has a different recognizable command depending on the type, and it is necessary to instruct the hole machining numerical control data creating device to convert the command into a command suitable for the NC machine tool when creating the NC data. Therefore, the above processing is performed. In step SA3, the operator instructs the material of the workpiece to the hole drilling numerical control data creation device. This processing is performed because the optimum processing conditions of the workpiece differ depending on the material, and is used for incorporating the optimum processing conditions into the NC data when creating the NC data.

Next, in step SA4, step SA1
In accordance with each of the hole data extracted in step (1), a process of registering the name of a processing tool for processing this hole into the numerical data control apparatus for hole processing by the operator is performed. In step SA5, for each hole data extracted in step SA1, a process of instructing the depth of the hole to the hole processing numerical control data creating apparatus is performed. Step S
In A6, the operator instructs the position of the hole to the hole control numerical control data creating device. Then, in step SA7, it is determined whether or not the processing in steps SA4 to SA6 has been performed for all hole data.

If the result of the determination in step SA7 is "NO", the process returns to step SA4. If the determination is "YES", the process proceeds to step SA8. In step SA8, a process of creating NC data based on the hole data extracted in step SA1 and various information instructed by the operator to the drilling numerical control data creating device in steps SA2 to SA6 is performed.

[0006]

By the way, in the above-mentioned conventional method for preparing numerical control data for drilling, the operator needs to
For each of the hole data in the CAD data, interactively input the attribute information including the name of the processing tool used in the processing, the depth of the hole, the position of the hole, etc. to the numerical control data generating device for hole processing. However, there is a problem that it takes much time and effort. Further, since the input is performed manually by the operator, there is a problem that an erroneous input is likely to occur. Further, the conventional method for creating numerical control data for drilling has a problem that it takes a lot of time to create NC data.

When a large number of the same hole data exist in the CAD data, or when the same hole data exists in the other CAD data, the operator needs the same attribute information for all the holes of the same type. Has to be repeatedly input, which is troublesome, and data once input is not accumulated as processing know-how. The present invention has been made in view of the above circumstances, it is possible to reduce the labor and time to create NC data by reducing the input by the operator as much as possible, and it is possible to retain the know-how of hole processing, An object of the present invention is to provide a drilling numerical control data generating method and a drilling numerical control data generating apparatus capable of converting CAD data into NC data at high speed.

[0008]

According to the first aspect of the present invention,
A method for creating numerical control data for drilling, wherein NC data used in an NC machine tool is created from CAD data,
A first step of extracting hole data including a hole type, a diameter and a depth from the CAD data, and a machining step for the extracted hole data, wherein at least one tool type used in the machining step is stored. A second step of defining one process element, a third step of specifying a machining tool corresponding to the tool type for all of the step elements based on the diameter and depth of the extracted hole data, A fourth step of associating a processing depth with each of the process elements for which the processing tool is specified, based on the depth of the extracted hole data and the processing tool, and a process element with which the processing depth is associated And a fifth step of identifying a fixed cycle specific to the NC machine tool based on the process tool and associating the fixed cycle with the process element, wherein the processing tool, the processing depth, and the fixed cycle are associated with each other. Based on, in which automatic characterized by creating NC data.

An invention according to claim 2 is a numerical control data creating apparatus for drilling, which creates NC data used for an NC machine tool from CAD data, wherein the type, diameter and depth of a hole are obtained from the CAD data. Extracting means for extracting hole data comprising, for example, a machining process for the extracted hole data, and machining pattern data comprising at least one process element in which a tool type used in the machining process is stored. A first storage unit, a second storage unit in which functional tool information data including information on a processing tool used in the NC machine tool is stored, and a second storage unit in which the hole is formed. A third storage unit in which processing condition data including processing conditions are stored, and a calculating unit for obtaining a processing depth when the processing tool processes the workpiece. Fourth storage means for storing processing depth data to be formed, fifth storage means for storing fixed cycle data which is information relating to a fixed cycle unique to the NC machine tool, and the second to fifth storage means. NC data creating means for creating NC data based on the process element associated with the data stored in the storage means.

According to a third aspect of the present invention, in the method for creating numerical control data for hole drilling according to the first aspect, the third step includes a step of determining a diameter of the machining tool when the hole is chamfered. Based on the diameter and depth of the extracted hole data, determine whether the processing tool and the hole interfere with each other, and when it is determined that the interference, select a processing tool having an appropriate diameter. And an appropriate working depth.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a diagram showing an operation flow of the drilling numerical control data generating apparatus according to one embodiment of the present invention, and is applied to the drilling numerical control data generating apparatus according to the present embodiment using this figure. A method of creating numerical control data for drilling will be described. In FIG. 2, D1 indicates CAD (computer aided design) data having a plurality of pieces of drawing data of one sheet composed of graphic element data such as linear elements, curved elements, and hole elements. The figure number is attached to the data.

Each drawing data of the CAD data D1 is, for example, as shown in FIG.
1, 2 and graphic element data such as linear elements 3 and 3, identification codes 1a, 1a and 2a written in characters, and arrow notes 1
b, 2b and the like. The identification codes 1a, 1a and 2a are given to all the hole elements 1, 1 and 2 in the drawing data of the CAD data D1. For example, when there are two hole elements of the same type, such as the hole elements 1 and 1, the same identification codes 1a and 1a (in this example, “GP”) are assigned respectively. The hole element 2 has the hole elements 1 and 2.
1 that is different from the identification code 1a, 1a
(In this example, ""). Hereinafter, the hole element and text information related to the hole element are referred to as hole data.

The above arrow notes 1b and 2b are used to complement the two-dimensionally expressed hole elements 1, 1 and 2 into a three-dimensional shape.
And minimum necessary information for supplementing detailed information such as diameter and tolerance of hole data. Arrow note 1b
Is attached to any one of two hole elements of the same type, for example, like the hole elements 1 and 1 in FIG.
That is, when there are a large number of pore elements of the same type, any one of them is added.

As shown in FIG. 3B, the arrow notes 1b and 2b indicate the number 10-1 of the same kind of hole elements and the hole type 10 existing in the same drawing data of the CAD data D1.
-2, diameter 10-3, tolerance 10-4, depth 10-5, processing direction 10-6 indicating whether the hole is formed from the front or back surface of the workpiece, and a step on the surface of the workpiece. It is composed of a character string indicating a depth change 10-7 or the like indicating a level difference in the case where there is any. In the arrow notes 1b and 2b, items other than the type 10-2 and the diameter 10-3 can be omitted as necessary. For example, if there is only one hole element and the processing direction 10-6 is from the surface of the workpiece, the number 10
-1 and the processing direction 10-6 can be omitted.

D2 in FIG. 2 indicates user-defined data created in advance by an operator or the like, and includes processing pattern data including information indicating a processing step corresponding to the type.
And various data such as functional tool information data in which the diameter and length of the processing tool are stored. Also, D
3 is NC (numerical control) data.

First, the CAD data D1 is converted to the NC data D3.
The operation for converting to is described. In step SB1, the operator instructs a figure number attached to the drawing data in the CAD data D1 to be converted into the NC data D3 from an input device such as a keyboard to a numerical data control device for drilling (not shown). In step SB2, the operator instructs the hole processing numerical control data creating apparatus to convert the drawing data corresponding to the drawing number designated in step SB1 into NC data. In step SB3, the operator instructs the material of the workpiece to the hole drilling numerical control data creation device.

When the processes in steps SB1 to SB3 are completed, the process proceeds to step SB4. Step SB4
Then, the drawing data corresponding to the figure number designated by the operator in step SB1 is read from the CAD data D1, and the process of extracting the hole data existing in the range designated in step SB2 is performed.

In step SB5, the user-defined data D2 is read. Based on the user-defined data D2 and the material of the workpiece input in step SB3, the NC corresponding to the hole data extracted in step SB4 is performed. Data D3 is created. As described above, in the drilling numerical control data creation method according to one embodiment of the present invention, when the operator first instructs the drilling numerical control data creation device to the necessary information, it is automatically executed in batch mode. NC data D3 is created.

Next, with reference to FIG. 4, a description will be given of an apparatus for creating numerical control data for drilling according to the present embodiment which realizes the above-described method for generating numerical control data for drilling. FIG. 4 is a block diagram showing the configuration of the drilling numerical control data creation device according to the present embodiment. In FIG. 4, reference numeral 20 denotes an external storage device such as a hard disk for storing user-defined data D2, CAD data D1, and the like. The user-defined data D2 is processing pattern data D
2-1, functional tool information data D2-2, machining condition data D2-3, machining depth data D2-4, machining pattern specifying data D2-5, fixed cycle definition data D2-6, fixed cycle parameter data D2-7 , And process comment data D2-8. These data are composed of a plurality of records. Hereinafter, the user-defined data D
2 will be described in detail.

The processing pattern data D2-1 is a file in which processing steps and the like corresponding to the type of hole are stored.
A tool type, a comment number, a correction comment, and the like are described for each process (hereinafter, referred to as a process element) constituting the machining process. The processing pattern data D2-1 is classified according to the material of the workpiece. An example of the contents of the processing pattern data D2-1 is shown in the table in FIG. Records RA1 to RA6 consist of hole type CA1 and at least one process element CA2 to CA5,
They are arranged in priority order when multi-stage machining is performed. The process elements CA2 to CA5 are corrections indicating the tool type of the processing tool, the comment number serving as a pointer of the comment stored in the process comment data D2-8, the gap between the hole diameter and the tool diameter, and the like. Consists of comments.

For example, type C of record RA1 in the table
A1 is a drill hole, which is formed by the process elements CA2 to C2.
The three steps shown in A4 are performed in order, and are created.
The process element CA2 of the record RA1 is a process using a center drill, the process element CA3 is a process using a drill or speedy media, and the process element CA4 is a process using a forming end mill. The process element CA3
Has a comment number "2", and "-0.7, -0.0" is described as a correction comment.

The function tool information data D2-2 is a file in which the diameter and length of the working tool are stored. An example of the contents of the functional tool information data D2-2 is shown in a table in FIG. Record RB1 is a unique machine tool number CB1, a tool code CB2, and a tool diameter CB assigned to the processing tool.
3 and a tool length CB4. The above tool code CB2
Indicates detailed information of each machining tool.

FIG. 6B shows an example of the tool code CB2.
It is shown in the table in the middle. For example, when the tool type is a drill, the tool code CB2 includes the tool type, the diameter of the hole to be created, the effective length, the processing content described as a comment, and when the tool type is tap, the tool type and the effective length. , Pitch, and processing content. Although only the record RB1 is described in the table in FIG. 6A, the function tool information data D
2-2 is composed of a plurality of records.

The processing condition data D2-3 is a file storing optimum processing conditions according to the material of the workpiece. An example of the contents of the processing condition data D2-3 is shown in the table in FIG. Records RC1 to RC4 in the processing condition data D2-3 are a unique machine tool number CC1, a rotation number CC2 of the processing tool, a feed speed CC3 of the processing tool, and a cut amount per cut CC assigned to each processing tool.
4 For example, record RC1 has a machine tool number of “2040” and a rotation speed of 4153 [times / m].
in], the feed rate is 830 [mm / min], and the cut amount per operation is 3000 [mm / min].

The machining depth data D2-4 indicates that when actually machining a hole with a machining tool, the workpiece is cut by an amount corresponding to the shape of the blade of the tool from the set depth of the hole. Since it is necessary, the amount to be cut is determined according to the shape of the tip of the tool. When the hole is a through-hole, the minimum depth required to penetrate the hole is determined. An example of the contents of the machining depth data D2-4 is shown in the table in FIG. Machining depth data D2-
Numeral 4 stores the actual cutting depth of each processing tool in the form of an arithmetic expression. Records RD1 to RD9 are a tool type CD1, an arithmetic expression CD2 indicating a depth at which a workpiece is cut when the hole is a non-through hole, and a minimum necessary for penetrating the hole when the hole is a through hole. Expression CD indicating depth
3 and the clearance angle θ of the machining tool 29 shown in FIG.
And the angle CD4.

For example, as shown in FIG. 8A, when the tool type CD1 of the record RD2 is a drill and the hole is a non-through hole, the arithmetic expression CD2 is L + D / 2 × tan.
θ, if the hole is a through hole, the arithmetic expression CD3 is b + 1 + D
/ 2 × tan θ, and the angle CD4 is 30 °. The above “L” is the set hole depth, and “D” is FIG.
This is the diameter of the working tool as shown in FIG. Also,
“B” is the height of the workpiece. The above formula CD3, C
The unit of the value obtained by D4, the diameter “D” of the processing tool, the depth “L” of the hole, and the height “b” of the workpiece are [mm].
It is.

When the tool type CD1 is a drill as in the above example, the drill angle CD4, that is, the clearance angle θ of the working tool is 30 °. For example, the hole is a non-through hole and the depth of the hole is The “L” is 150 [mm] and the drill diameter is “D”
Is 50 [mm], the arithmetic expression CD2, that is, L +
The depth at which the workpiece is actually processed is obtained from D / 2 × tan θ, and the value is 164.4 [mm].

The processing pattern specifying data D2-5 is a file describing a machine tool number and a processing depth of a processing step of a specific type of hole such as a taper tap. An example of the contents of the processing pattern specifying data D2-5 is shown in the table in FIG. Records RE1 to RE6 are of type CE1,
And one or more process elements CE2 to CE4. The process elements CE2 to CE4 are configured by a machine tool number of a processing tool used in the process, a processing depth of a workpiece, and the like.

Further, the fixed cycle definition data D2-6 and the fixed cycle parameter data D2-7 are for including the information of the fixed cycle specific to the NC machine tool (not shown) in the NC data in FIG. . An example of the contents of the fixed cycle definition data D2-6 is shown in the table in FIG. Records RF1 to RF12 in FIG. 10 are a tool type CF1 and a fixed cycle number CF2 unique to the NC machine tool.
Consists of

The fixed cycle parameter data D2-7 describes the necessity or necessity of the parameter because the required parameter differs for each fixed cycle number CF2 of the fixed cycle definition data D2-6. An example of the contents of the fixed cycle parameter data D2-7 is shown in the table in FIG. Each of the records RG1 to RG7 includes a fixed cycle number CG1, a flag CG2 indicating whether or not to set the feed speed of the tool, and a flag CG3 indicating whether or not to set a cutting amount per tool. For example, the record RG2 has the fixed cycle number “8350”, the value of the flag CG2 is “1”, and the flag C
The value of G3 is “0”. That is, in the case of the fixed cycle with the fixed cycle number “8350”, the feed speed of the working tool is set, and the cutting amount per operation of the working tool is not set.

Further, the process comment data D2-8 corresponds to the process elements CA2 to CA2 in the process pattern data D2-1.
This is data in which a readable comment corresponding to the comment number described in CA5 is described. This data is NC
It can be output as a comment sentence in the data D3. An example of the contents of the process comment data D2-8 is shown in FIG.
Table 2 shows the results. The records RH1 to RH5 are composed of a comment number CH1 and a process comment CH2. For example, in the record RH2, the comment number CH1 is “2” and the process comment CH2 is “prepared hole”.

In FIG. 4, reference numeral 21 denotes a RAM (random accumulator).
An internal storage device such as an ess memory) for temporarily storing the user-defined data D2, the drawing data D4 constituting the CAD data D1, the hole data D5, and the like. Reference numeral 22 denotes a display device for outputting various information such as information prompting the operator to input, and reference numeral 23 denotes a display device such as a CRT for displaying information output from the display device 22.

Reference numeral 24 denotes a hole information extracting unit for executing the process of extracting the hole data D5 performed in step SB4 in FIG. 2, and the drawing data D stored in the internal storage device 21.
4 is processed as described above. Reference numeral 25 denotes an NC data creation unit that executes the creation of the NC data D3 performed in step SB5 in FIG. An NC data output device 26 outputs the NC data D3 to the NC machine tool. Reference numeral 27 denotes an input device such as a keyboard for the operator to input various information.

In the above configuration, first, the operator
The figure number attached to the drawing data D4 in the CAD data D1, and NC among the drawing data D4 attached with this figure number
The range to be converted to the data D3 and the material of the workpiece are input from the input device 27. When the input is completed, the drawing data D4 of the drawing number designated by the operator is read from the CAD data D1 stored in the external storage device 20 to the internal storage device 21. Next, a process of extracting the hole data D5 from the drawing data D4 read into the internal storage device 21 (Step SB4 in FIG. 2) is performed.

In this process, from the drawing data D4 read into the internal storage device 21, hole data D5 comprising hole elements existing in the range designated by the operator and text information on the hole elements are extracted. . And
From the hole element in the hole data D5, the center coordinates, the processing direction, the diameter, and the like can be obtained.
As shown in (b), the number of hole elements 10-1, hole type 10-2, diameter 10-3, tolerance 10-4, depth 10
-5, a processing direction 10-6, a depth change 10-7, and the like are obtained. The hole element and the text information are associated with each other. At this time, graphic elements other than the hole data D5 (for example, linear elements, point elements, etc.) are excluded. Further, an identification number assigned to each hole element is extracted.

Next, a process (step SB5 in FIG. 2) of automatically converting the hole data D5 into the NC data D3 is performed by the NC data creating unit 25. Hereinafter, this processing will be described with reference to FIGS. FIG.
Is a flowchart showing a procedure for automatically converting hole data D5 into NC data D3. In FIG. 1, in step SC1, the user-defined data D2 is stored in the external storage device 20.
Is read into the internal storage device 21 from the. Step SC2
In the processing, the extracted hole data D5 is rearranged in the order of depth, for example.

At Step SC3, Step S in FIG.
In B3, the processing pattern data D2-1 corresponding to the material of the workpiece specified by the operator is selected. Then, according to the type in the extracted hole data D5, a processing step for creating a hole of that type is retrieved from the selected processing pattern data D2-1, and the process elements RA2 to RA2 are searched.
RA5 is expanded in the internal storage device 21. The developed process elements CA2 to CA5 are composed of a tool type to be used, a comment number, and a correction comment, as shown in the table in FIG.

If the type in the hole data D5 is a specific type, the processing pattern specifying data D2-5 is searched using the type as a key, and the process elements CE2 to CE4 for the type are stored in the internal storage device 21. Be expanded. In this case, the tool type of the working tool used in the process is not described in the process elements CE2 to CE4, but the machine tool number and the working depth are described instead. Upon completion of the process in the step SC3, the process proceeds to a step SC4
Proceed to.

In step SC4, a process for specifying a working tool to be used is performed for each of the process elements CA2 to CA5 developed in step SC3. For example,
When the tool type described in the process elements CA2 to CA5 is drill, the function tool information data D2-2 stored in the internal storage device 21 is searched using “drill” as a key. Then, the type, tolerance, and the like in the hole data D5
One processing tool is selected based on the depth, the correction comment in the process element, and the like, and each tool type and machine tool number, tool diameter, tool length, and tool code in the process elements CA2 to CA5 are selected. Can be associated.

When a plurality of tool types are described in the process elements CA2 to CA5, an appropriate processing tool is selected according to the diameter of the hole or the frequency of use. The process element CA
The process comment data D2-8 is searched by using the comment number in 2 to CA5 as a key, and the comment number in the process elements CA2 to CA5 is associated with the process comment. The above-described processing is performed on all the process elements developed in the internal storage device 21. Further, when the type in the hole data D5 is a specific type, the machining pattern specification data D2-5 describes the machine tool number of the processing tool to be used. Not done.

In step SC5, the vertical position of the workpiece necessary to create a hole having the actually set depth is determined based on the depth 10-5 and the depth change 10-7 in the hole data D5. A process of obtaining an amount of moving the processing tool in the direction (hereinafter, referred to as a processing depth) is performed. In this process, the machining depth data D2-4 stored in the internal storage device 21 is searched using the tool type described in each of the process elements CA2 to CA5 as a key, and the tool diameter and hole associated in step SC4 are retrieved. The depth at which the working tool actually cuts is determined using the depth or the height of the workpiece as a parameter.
For example, when the tool type is a gun drill, the diameter is 10 [mm], and the hole depth is 50 [mm], a record RD6 in the table in FIG. 8A is obtained, and a corner of the record RD6 is obtained. The clearance angle θ (30 °) of the working tool is obtained from CD4, and the actual cutting depth is obtained from the arithmetic expression CD2, and the value is 51.4 [mm]. The processing depth determined in this way is associated with each process element.

Furthermore, when a chamfering process is performed on a hole, some chamfering tools may interfere with the hole (there may be a portion cut by the chamfering tool other than a portion to be chamfered). Then, processing for preventing this interference is performed. For example, as shown in FIG.
When the edges C1 and C1 of the hole formed in the workpiece 30 are chamfered, the tip of the chamfering tool 32 and the bottom surface 33 of the hole interfere with each other, and the bottom surface 33 is cut. Further, as shown in FIG. 13B, when a counterbore is formed on the workpiece 35, when chamfering the edges C2 and C2 of the holes formed inside, the chamfering tool 36 and the chamfering tool 36 are used. The edges C3 and C3 of the holes formed on the outside interfere with each other, and the edges C3 and C3 are cut.

Therefore, as shown in FIG.
Based on the tip diameter R1 and the shaft diameter R2 of the chamfering tool 38, the machining depth of the chamfering tool 38 is calculated (normally, since the angle of the blade of the chamfering tool is fixed, the tip diameter R1 and The machining depth is determined from the shaft diameter R2). FIG.
As shown in (a), when the tip of the chamfering tool 32 interferes with the bottom surface 33 of the hole, a chamfering tool whose shaft diameter R2 is larger than the diameter of the hole is selected, and the machining depth is reduced. It is set shallower than the depth of the hole. In addition, as shown in FIG. 13B, when the diameter of the chamfering tool 36 interferes with the edges C3 and C3 of the holes formed on the outside, the diameter of the holes formed on the outside and the diameter formed on the inside are different. A chamfering tool having a shaft diameter R2 between the diameter of the formed hole and the machining depth is set to be smaller than the depth of the hole formed inside. If the type in the hole data D5 is a specific type, the processing depth is described in the process elements CE2 to CE4 in the processing pattern specification data D2-5. No processing other than the processing to be prevented is performed.

In step SC6, a process of setting a fixed cycle number in each process element and obtaining information required by the NC machine tool when actually processing the workpiece is performed. In this process, first, each process element CA2 to CA5
Fixed cycle definition data D stored in the internal storage device 21 using the tool type of the processing tool used in
2-6 are retrieved, and the fixed cycle actually required by the machining tool of the tool type is obtained as the fixed cycle number CF2. Then, one of the machining condition data D2-3 is selected based on the material of the workpiece input by the operator, and the selected machining condition data D2-3 is searched for using the machine tool number CB1 as a key. A high rotational speed CC2 is obtained.

Further, based on the fixed cycle number,
The fixed cycle parameter data D2-7 stored in the internal storage device 21 is searched, and the presence or absence of a parameter required by the fixed cycle is checked. When the fixed cycle requires a parameter (when the value of the flag CG2 or the flag CG3 in the table in FIG. 11 is “1”), the machining condition data D2 stored in the internal storage device 21
-3 is retrieved to obtain the required parameters. For example, when the values of both the flags CG2 and CG3 are “1” like the record RG6 in the fixed cycle parameter data D2-7, the feed rate CC3 and the cut amount CC4 per one time are obtained from the processing condition data D2-3. can get.

In step SC7, the processing method performs step SC for all the hole data from the surface of the workpiece.
It is determined whether the processing from step 3 to step SC6 has been performed. If the determination is "NO", the process proceeds to step SC
Returning to step 3, if the determination result is "YES", the process proceeds to step SC8. In step SC8, step S8 is performed for all the hole data whose machining direction is from the back surface of the workpiece.
It is determined whether the process from step C3 to step SC6 has been performed. If the determination is "NO", the process proceeds to step S
Returning to C3, if the determination result is "YES", the process proceeds to Step SC9.

In step SC9, a process of converting the data associated with each other in steps SC3 to SC6 into NC data D3 and outputting the NC data D3 is performed. The converted NC data D3 is sent from the NC data output device 26 in FIG. 4 to the NC machine tool. Note that the created NC data D3 is not sent directly to the NC machine tool, but is temporarily sent to the display 2 via the display device 22.
3 may be displayed so that the operator can confirm it.

The processing pattern data D2-
1. The tool type or type described in the functional tool information data D2-2 and the fixed cycle definition data D2-6 is not described by its name, but is described, for example, by a symbol indicating the tool type or type. May be. Also,
Each of the data making up the user-defined data D2 may be described in any format that is readable by humans or in a format that is easily processed by the numerical control data creation device for drilling.

[0049]

As described above, the method for creating numerical control data for drilling and the apparatus for generating numerical control data for drilling according to the present invention have various data describing the know-how of drilling, and based on this data, The CAD data is automatically converted to NC data. Therefore, if the operator
This has the effect of eliminating the trouble of inputting information for each hole data in the AD data. In addition, since the operation of manually inputting the information by the operator is reduced, there is an effect that there is no erroneous input.

Further, since the various data are classified according to the type of data, there is an effect that the processing know-how is accumulated and the processing know-how can be easily added and changed. Further, the various data describing the know-how are classified according to the type of the data, and since the respective data are related to each other, there is no redundant description and the number of searches is reduced. There is the effect that the processing when converting to data is fast.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a procedure for automatically converting hole data D5 into NC data D3.

FIG. 2 is a diagram showing an operation flow of the drilling numerical control data creation device according to one embodiment of the present invention.

FIG. 3 is an example of entry of drawing data of CAD data D1.

FIG. 4 is a block diagram illustrating a configuration of a numerical control data creation device for drilling according to an embodiment of the present invention.

FIG. 5 is a diagram showing an example of the contents of processing pattern data D2-1.

FIG. 6 is a diagram showing an example of the contents of functional tool information data D2-2.

FIG. 7 is a diagram showing an example of the contents of processing condition data D2-3.

FIG. 8 is a diagram showing an example of the contents of machining depth data D2-4.

FIG. 9 is a diagram showing an example of the contents of processing pattern specifying data D2-5.

FIG. 10 is a diagram showing an example of the contents of fixed cycle definition data D2-6.

FIG. 11 is a diagram showing an example of the contents of fixed cycle parameter data D2-7.

FIG. 12 is a diagram showing an example of the contents of process comment data D2-8.

FIG. 13 is a diagram illustrating an example of interference between a workpiece and a chamfering tool.

FIG. 14 is a flowchart showing a conventional method for creating numerical control data for drilling.

[Explanation of symbols]

 24 hole information extraction unit 25 NC data creation unit D1 CAD data D2 user-defined data D3 NC data D4 drawing data D5 hole data D2-1 machining pattern data D2-2 functional tool information data D2-3 machining condition data D2-4 machining depth Data D2-5 Processing pattern specific data D2-6 Fixed cycle definition data D2-7 Fixed cycle parameter data D2-8 Process comment data

Claims (3)

[Claims] 1. A method for creating numerical control data for drilling, wherein NC data used for an NC machine tool is created from CAD data, wherein hole data including a hole type, a diameter, a depth, and the like are formed from the CAD data. A first step of extracting, a second step in which a machining process for the extracted hole data is at least one process element storing a tool type used in the machining process, and machining corresponding to the tool type. A third step of specifying a tool for all of the process elements based on the diameter and depth of the extracted hole data; and extracting the extracted hole data for each of the process elements for which the machining tool is specified. Based on the depth of the working tool
A fourth step of associating a machining depth; and a fifth step of identifying a fixed cycle unique to the NC machine tool based on the process element to which the machining depth is associated, and associating the fixed cycle with the process element. A numerical control data creation method for hole machining, wherein NC data is automatically created based on the process element in which the machining tool, machining depth, and fixed cycle are associated with each other. 2. A drilling numerical control data creating apparatus for creating NC data used in an NC machine tool from CAD data, wherein the CAD data is used to convert hole data including a hole type, a diameter and a depth. Extracting means for extracting; and a first storage means for storing a machining pattern data comprising at least one process element storing a tool type used in the machining step for the machining step for the extracted hole data. A second storage unit storing functional tool information data composed of information on machining tools used in the NC machine tool; and machining conditions for a material of a workpiece on which the hole is created. A third storage unit in which processing condition data is stored; and a processing depth configured to calculate a processing depth when the processing tool processes the workpiece. Data, fixed cycle data that is information on a fixed cycle unique to the NC machine tool, and second to fifth storage means. NC data creating means for creating NC data on the basis of the process element associated with the created data. 3. The method according to claim 1, wherein the third step is a step of, when the hole is subjected to chamfering, based on a diameter of the processing tool and a diameter and a depth of the extracted hole data. 2. A drilling tool according to claim 1, wherein it is determined whether or not they interfere with each other, and if it is determined that they do, a machining tool having an appropriate diameter is selected and an appropriate machining depth is obtained. How to create numerical control data.