JP2001084017A - Device and method for preparing nc data and storage medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an NC data preparation device capable of easily preparing numerical data for a rough machining electrode without requiring much manhour. SOLUTION: In NC data generation processing, graphic element and text data are extracted from CAD data stored in a storage device 8 and the NC data of a finishing electrode are calculated in order to work the finishing electrode like a shape of the extracted graphic elements (steps S1, S2). When data for a rough machining electrode are required, an offset value between the finishing electrode and the rough machining electrode is found out from extracted electric discharge machining data (the existence of oscillation, an oscillation variable, etc.), and the NC data of the rough machining electrode are calculated from the graphic data and the found offset value (steps S3 to S6).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an NC data generating apparatus, an NC data generating method, and a storage medium for generating numerical data to be used in a numerically controlled machine tool based on shape data representing the shape of a workpiece previously created. About.

[0002]

2. Description of the Related Art Conventionally, when processing one part using a numerically controlled machine tool (hereinafter referred to as an NC machine tool), for example, a machining center, a drawing of the part is created by a CAD system, and the NC machining is performed from the created drawing. 2. Description of the Related Art A technique for creating NC data for operating a machine using an automatic programming function is widely known.

[0003]

However, without modifying the created CAD figure, N
When creating the C data, it is not possible to create the NC data of the roughing electrode required for the electrode machining of the electric discharge machining from this CAD figure, and the CAD data is generated before the automatic programming.
By reshaping the figure, the NC of the roughing electrode
It becomes possible to create data. As a result, it takes a lot of man-hours to create the NC data of the roughing electrode.

An object of the present invention is to provide an NC data creating apparatus, an NC data creating method, and a storage medium that can easily create numerical data of a roughing electrode without requiring a large number of man-hours. .

[0005]

According to the first aspect of the present invention,
N which generates numerical data to be used in a numerically controlled machine tool based on shape data representing the shape of a workpiece previously created
A machining data extracting device for extracting, from the shape data, electric discharge machining conditions for machining the workpiece by electric discharge machining, and a finishing electrode for the workpiece based on the extracted electric discharge machining conditions. And numerical data generating means for generating numerical data for processing the workpiece as a roughing electrode.

[0006] The invention according to claim 2 is the invention according to claim 1.
In the C data creation device, the numerical data generating means calculates an offset amount between the finishing electrode and the roughing electrode based on the electric discharge machining conditions, and calculates the calculated offset amount and numerical data of the finishing electrode. And generating numerical data of the roughing electrode from the data.

According to a third aspect of the present invention, there is provided an NC data generating method for generating numerical data to be used in a numerically controlled machine tool based on shape data representing a shape of a workpiece previously created. A step of extracting electrical discharge machining conditions when machining the workpiece by electric discharge machining, and roughing the numerical data and the workpiece for machining the workpiece as a finishing electrode based on the extracted electrical discharge machining conditions. Generating numerical data for processing as an electrode for use.

[0010] The invention according to claim 4 is the invention according to claim 3.
In the C data creation method, an offset amount between the finishing electrode and the roughing electrode is calculated based on the electric discharge machining condition, and the roughing electrode is calculated from the calculated offset amount and the numerical data of the finishing electrode. Numerical data is generated.

According to a fifth aspect of the present invention, there is provided a storage medium storing a program for generating numerical data to be used in a numerically controlled machine tool based on shape data representing a shape of a workpiece previously created. A machining condition extraction module for extracting electric discharge machining conditions when machining the workpiece by electric discharge machining from the shape data,
A numerical data generating module for generating numerical data for processing the workpiece as a finishing electrode and numerical data for processing the workpiece as a roughing electrode based on the extracted electric discharge machining conditions, It is characterized by having.

According to a sixth aspect of the present invention, in the storage medium according to the fifth aspect, the numerical data generation module calculates an offset amount between the finishing electrode and the roughing electrode based on the electric discharge machining condition. Numerical data of the roughing electrode is generated from the calculated offset amount and numerical data of the finishing electrode.

[0011]

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

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

As shown in FIG. 1, the NC data creation device 10 is a communication device 9 for connecting an NC machine tool 20, a CAD / CAM engineering workstation (EWS) 21, and a device stored in the ROM 6 according to a program. Controls the entire machine and performs NC control based on shape data representing the shape of the workpiece created in advance.
C that performs processing to generate NC data used in machine tools
PU1. RAM is in the calculation work area of CPU1.
The RAM 7 stores data, variable parameters, and the like.

The input unit 2, the display unit 3, the output unit 4, and the storage device 8 are connected to the CPU 1 via the internal bus 5, together with the ROM 6 and the RAM 7. The input unit 2 includes a keyboard for inputting data, parameters, and the like. The display unit 3 displays the result of the arithmetic processing by the CPU 1, input data, parameters, and the like. The output unit 4 is a CP
It comprises a printer or the like that prints out the result of the arithmetic processing by U1. The storage device 8 includes a hard disk drive, a floppy disk, and the like, and the storage device 8 stores CAD data and the like fetched from the CAD / CAMES 21 via the communication interface 9.

Here, the program for performing the process of generating the NC data to be used in the NC machine tool based on the previously created shape data representing the shape of the workpiece is a program for converting the shape data to the workpiece. A data extraction module for extracting electric discharge machining data for machining as an electric discharge machining electrode when performing electric discharge machining, and NC data and machining for machining a workpiece as a finishing electrode based on the extracted electric discharge machining data An NC data generation module for generating NC data for processing an object as a roughing electrode. The NC data generation module includes:
Specifically, an offset amount between the finishing electrode and the roughing electrode is calculated based on the electric discharge machining data, and NC data of the roughing electrode is generated from the calculated offset amount and the NC data of the finishing electrode.

A process for generating NC data when the workpiece is processed by electric discharge machining will be described with reference to FIGS. FIG. 2 is a flowchart showing a procedure of an NC data generation process of the NC data creation device of FIG. 1,
FIG. 3 is a diagram showing an example of an electrode diagram for electric discharge machining instructing electric discharge machining, and FIG. 4 is a diagram showing an example of a list of electric discharge machining conditions.

First, a description will be given of an electric discharge machining electrode diagram for instructing electric discharge machining. As shown in FIG. 3, FIG. Instructions relating to the conditions and instructions relating to the roughing electrode are described as text data.

For example, the text data of the instruction relating to the discharge condition and the instruction relating to the roughing electrode at the time of electric discharge machining include data relating to the presence / absence of the “roughing electrode” and data relating to the “machining condition”. The data related to the presence or absence of the swing machining, the data related to the swing amount, and the data related to the discharge gap are included. These data are read and stored in the RAM 7 as described later.

An example of preparing the NC data of the roughing electrode using the electric discharge machining electrode diagram will be described.
The above text data is read, and the processing pattern attached to the data of the “processing condition” is compared with the processing pattern list shown in FIG. Here, if the machining pattern attached to the data of the “machining condition” is in the machining pattern list shown in FIG. 4, the swing motion, the swing amount, and the discharge in the corresponding machining pattern in the machining pattern list are displayed. The values of the parameters of the gap, the roughing discharge gap, and the finishing allowance are stored in the RAM 7, and a tool locus for performing machining as a roughing electrode is calculated from the parameter values and the tool locus of the finishing electrode.

The above-mentioned processing pattern list is stored in the ROM 6 in advance as a table format.
, And may be configured to be read as needed.

The procedure of the NC data generation process will be described in detail. As shown in FIG.
In step (1), graphic elements and text data are extracted from the CAD data stored in the storage device 8. The extracted graphic elements and text data are stored in the RAM 7. Then, in step S2, the NC data of the finishing electrode to be processed according to the shape of the extracted graphic element is calculated.

Then, the program proceeds to a step S3, at which electric discharge machining data relating to electric discharge machining is extracted from the text data. Is determined. When processing as a rough electrode is not necessary, this processing is ended. In contrast,
When machining as a roughing electrode is necessary, the process proceeds to step S5, and an offset amount between the finishing electrode and the roughing electrode is obtained from the extracted electric discharge machining data (whether or not the swing is described above, the swing amount, and the like). In the following step S6, the N of the roughing electrode is determined from the graphic data and the obtained offset amount.
The C data is calculated, and the process ends.

As described above, in the present embodiment, electric discharge machining data for machining as an electric discharge machining electrode when performing electric discharge machining on a workpiece is extracted from the shape data, and the electric discharge machining data is extracted based on the extracted electric discharge machining data. Since NC data for processing a workpiece as a finishing electrode and NC data for processing a workpiece as a roughing electrode are respectively generated, numerical data of the roughing electrode can be obtained without a large number of man-hours. Can be easily created.

In the present embodiment, the NC data generation processing program is stored in the ROM 6, but instead, the NC data generation processing program is supplied from a storage medium such as a floppy disk, CDROM, or MO. You may make it. In this case, the storage medium storing the NC data generation processing program constitutes the present invention, and the NC data generation processing program may be read from this storage medium and executed.

[0025]

As described above, according to the NC data creating apparatus of the present invention, the machining condition extracting means for extracting the electric discharge machining conditions when machining the workpiece by the electric discharge machining from the shape data, Since there are provided numerical data generating means for generating numerical data for processing the workpiece as a finishing electrode and numerical data for processing the workpiece as a roughing electrode based on the electric discharge machining conditions, Numerical data of the roughing electrode can be easily created without adding man-hours.

According to the NC data creating method of the present invention, a step of extracting electric discharge machining conditions when machining a workpiece by electric discharge machining from the shape data, and a step of finishing the workpiece based on the extracted electric discharge machining conditions. A process for generating numerical data for processing as an electrode and numerical data for processing a workpiece as a roughing electrode, respectively, so that the numerical data of the roughing electrode can be calculated without a large number of steps. Can be easily created.

According to the storage medium of the present invention, the program comprises: a machining condition extracting module for extracting electric discharge machining conditions for machining a workpiece by electric discharge machining from shape data; Since it has a numerical data generation module for generating numerical data for processing the workpiece as a finishing electrode and numerical data for processing the workpiece as a roughing electrode,
The numerical data of the roughing electrode can be easily created without requiring a lot of man-hours.

[Brief description of the drawings]

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

FIG. 2 is a flowchart illustrating a procedure of an NC data generation process of the NC data creation device in FIG. 1;

FIG. 3 is a diagram showing an example of an electrode diagram for electric discharge machining instructing electric discharge machining.

FIG. 4 is a diagram showing an example of a list of electric discharge machining conditions.

[Explanation of symbols]

 Reference Signs List 1 CPU 2 input unit 3 display unit 4 output unit 6 ROM 7 RAM 8 storage device 9 communication interface 10 NC machine tool 11 CAD / CAMEWS

Claims (6)

[Claims] 1. An NC data generating apparatus for generating numerical data to be used in a numerically controlled machine tool based on shape data representing a shape of a workpiece created in advance, wherein the workpiece is subjected to electrical discharge machining from the shape data. Machining condition extracting means for extracting electric discharge machining conditions at the time of machining, numerical data for machining the workpiece as a finishing electrode based on the extracted electrical discharge machining conditions, and the workpiece as a roughing electrode. An NC data generating apparatus, comprising: numerical data generating means for generating numerical data for processing. 2. The numerical data generating means calculates an offset amount between the finishing electrode and the roughing electrode based on the electric discharge machining condition, and calculates an offset amount between the calculated offset amount and the numerical data of the finishing electrode. The numerical data of the roughing electrode is generated.
C data creation device. 3. An NC data generating method for generating numerical data to be used in a numerically controlled machine tool based on shape data representing a shape of a workpiece created in advance, wherein the workpiece is subjected to electrical discharge machining from the shape data. Extracting electric discharge machining conditions when machining, and numerical data for machining the workpiece as a finishing electrode based on the extracted electrical discharge machining conditions and machining the workpiece as a roughing electrode. Generating each of the numerical data of (1) and (2). 4. An offset amount between the finishing electrode and the roughing electrode is calculated based on the electric discharge machining conditions, and a numerical value of the roughing electrode is calculated from the calculated offset amount and numerical data of the finishing electrode. The method according to claim 3, wherein data is generated. 5. A storage medium storing a program for generating numerical data to be used in a numerically controlled machine tool based on shape data representing a shape of a workpiece to be created in advance, wherein the program is configured to execute the processing from the shape data. A machining condition extraction module for extracting electric discharge machining conditions when machining the workpiece by electric discharge machining; numerical data for machining the workpiece as a finishing electrode based on the extracted electric discharge machining conditions; A storage medium comprising: a numerical data generation module that generates numerical data for processing a workpiece as a roughing electrode. 6. The numerical data generating module calculates an offset amount between the finishing electrode and the roughing electrode based on the electric discharge machining condition, and calculates the offset amount and the numerical data of the finishing electrode. 6. The storage medium according to claim 5, wherein numerical data of the roughing electrode is generated.