JPH05274020A - Method and device for tool offset shape data input type numerical control - Google Patents

Abstract

PURPOSE:To improve the productivity and the operability of a system where the NC machining is carried out by means of the output data given from the CAD/CAM. CONSTITUTION:The tool offset shape data received from a CAM 200 and divided for each machining process are received at a high speed data processing part 300 via a communication circuit of a LAN, etc., and then temporarily stored in a buffer memory 301. Then the tool path data is produced and converted into an NC program under the designated cutting conditions. This NC program is sent to a machine tool 402 via a numerical control part 401.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tool offset shape data input type numerical control method and apparatus in a machining system for performing NC machining using output data from CAD / CAM, and particularly to productivity and operability. The present invention relates to an improved tool offset shape data input type numerical control method and apparatus.

[0002]

2. Description of the Related Art In order to efficiently create an NC program for designing a shape model using a computer and performing automatic processing by an NC processing machine from this shape model, C
AD (Computer Aided Design) and CAM (Computer Aied Design)
ded Manufacturing) is used. For example, JP-A-61-213901, JP-A-1-123302, and JP-A-2-2059.
The above technology is disclosed in Japanese Patent Publication No. 75.

A system configuration of a conventional machining system using CAD or CAM is shown in FIG. CAD part 10
At 0, shape creation and shape definition for creating a shape model are performed, and, for example, shape data representing the shape shown in FIG. 5A is output. In the CAM unit 150, information designating a tool shape for creating a tool offset surface from the tool shape designating unit 160, a tool moving route from the tool moving route designating unit 170, a cutting speed and a feed from the cutting condition designating unit 180. Cutting conditions such as speed, work material and tool material are input. The CAM unit 150 receives the shape data,
The shape interpretation unit 151 decodes and interprets the shape. Based on the shape data thus interpreted, the tool offset shape data is obtained from the tool offset surface creation unit 152 that creates a tool offset surface offset by the radius of the tool as shown in FIG. 5B. Tool interference check unit 15
In 3, the interference of the tool offset shape is checked based on the obtained tool offset shape data, and an appropriate offset surface is defined. The tool path data creation unit 154 creates a tool path, for example, as shown in FIG. 5C, based on the above data, and the post process unit 155.
Processing is performed in consideration of conditions such as the type of processing machine and cutting ability, and is converted into an NC program that defines the movement of the tool for each micro area as shown in FIG.
6 is stored.

Thus, the memory 15 in the CAM unit 150
The NC programs stored in 6 are sequentially transmitted to the DNC device 250 side via the LAN. DNC device 250
On the side, the sent NC program is stored in the memory 251, and in response to the activation command from the activation command unit 260,
The NC program read from this memory 251
From the program transfer unit 252 to the NC machine tool 40
0 is sent to the numerical controller 403 to control the machine tool 402.

FIG. 4 shows an example of the configuration of the conventional processing system. CAD section 1 on the host computer side
00 and CAM unit 150, the NC program obtained by the CAD / CAM unit 1 is sent to the DNC device 8 (corresponding to 250 in FIG. 3) via the LAN, which is a high-speed communication means, and stored in the memory. .. The NC program is sequentially read from the memory of the DNC device 8 and supplied to the numerical controller main body 2. The NC program thus supplied is stored in the communication buffer 25. Numerical control device 2
In addition to the communication buffer 25, includes a numerical control unit 22, a servo control unit 23, and a machine sequence control unit 24, which are connected to each other via a bus line. Communication buffer 2
The NC program read from 5 is the numerical control unit 22.
To the servo control unit 23.
The servo control is performed by. The output from the servo control unit 23 is amplified by the servo amplifier 4 to control the rotation of the motor 5 to drive the machine tool 6. The machine sequence control unit 24 sends a control signal for performing a tool or work replacement operation or the like via the I / O interface unit 7 to the machine tool 6
Supply to. Similarly, the DNC device 8 can output an NC program to the other numerical control device 2, the servo amplifier 4, the motor 5, the machine tool 6 and the I / O interface section 7 to control a plurality of machine tools. ..

[0006]

As described above, the conventional numerical control method using CAD and CAM and the apparatus using the same are provided in the CAD unit and the CAM unit on the host computer side for generating the shape data and the tool offset. Surface creation and NC
After all the conversion processing to the program is performed and the creation of all the NC programs is completed, the NC program is supplied to the DNC device unit via the LAN. DNC device 250
Then, the supplied NC program is stored in the memory, and in response to the start command, the NC program is transferred to the NC machine tool to control the machining of the work.

However, in such a conventional method, CA
It takes a huge amount of time to perform a series of processes on the M side, which has been an obstacle to improving the productivity of NC processing. In addition, in the actual work on the NC machine tool side, if there is no specified tool, if you want to change the tool path depending on the machining status or if you want to change some cutting conditions, you can change the setting conditions on site. When it occurs, in the conventional method, the change condition is input again to the CAM unit on the host computer side, the NC program is obtained through the complicated processing described above, and the obtained NC is obtained.
The program was sent to the NC machine tool side. Therefore, the CAM side must perform the above-mentioned complicated processing again for a huge amount of time to create an NC program, which becomes a factor that hinders the improvement of productivity and the operability is extremely poor. In addition, the long NC program created on the CAM side needs to be stored in a storage medium such as a disk, which causes a problem of costly storage.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tool offset shape data input type numerical control method and apparatus for improving productivity and operability.

[0009]

In order to solve the above-mentioned problems, a tool offset shape data input type numerical control method according to the present invention provides tool offset shape data offset from the shape data of a workpiece to be machined by the radius of the tool. A tool offset shape data input type numerical control method for receiving and generating an NC program, which receives tool offset shape data divided for each previously designated machining step, temporarily stores it in a buffer memory, and stores the stored tool offset. An NC program suitable for the numerically controlled machine tool to be used is generated from the shape data and the specified tool movement path and cutting conditions, and the NC program is sequentially transferred to the numerically controlled unit of the numerically controlled machine tool. ing.

Further, the tool offset shape data input type numerical control device according to the present invention receives tool offset shape data offset by the radius of the tool from the shape data of the workpiece to be machined and inputs the tool offset shape data for generating the NC program. A numerical controller, which is a buffer memory for receiving and temporarily storing tool offset shape data divided for each previously specified machining step, tool offset shape data stored in the buffer memory, and a specified tool movement path An NC program suitable for a numerically controlled machine tool to be used is created from tool path data creating means for creating tool path data from the tool path data, and tool path data created by the tool path data creating means and specified cutting conditions. The post-processing means and the serial transfer from the post-processing means Composed of a numerical control unit which emits an operation command corresponding to the NC program NC program receiving machine that.

Further, the numerical control machine tool for inputting tool offset shape data according to the present invention receives tool offset shape data offset by the radius of the tool from the shape data of the work to be processed, converts it into an NC program, and processes the work. A tool offset shape data input type numerically controlled machine tool for receiving a tool offset shape data divided for each pre-specified machining step and temporarily storing it, and a tool offset shape data stored in the buffer memory And a tool movement path specified by the tool path data creating means for creating tool path data, and a numerical control machine tool to be used from the tool path data created by the tool path data creating means and the specified cutting conditions Post processing means for generating a matched NC program, and the post NC to sequentially transferred from process unit
It is composed of a numerical control unit that receives a program and converts it into an operation command, and a machine tool that performs numerical control machining on a work according to the operation command issued from the numerical control unit.

[0012]

In the present invention, for example, the tool offset shape data for each machining process sent from the CAD / CAM side is LA
It is received by the numerical control device side via a communication line such as N, and the high-speed data processing unit provided on the numerical control device side creates tool path data for the tool offset shape data for each machining process received up to that time. By converting to an NC program and sequentially transferring it to the numerical control unit and performing numerical control processing, the processing time on the CAM side can be greatly shortened, and it is possible to immediately respond to condition specification and changes at the work site. The productivity and operability of the processing system have improved significantly.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a flowchart showing a processing procedure of an embodiment of a numerical control method for inputting a tool offset shape data according to the present invention. In the present embodiment, the CAD unit 100 provided on the host computer side sends the shape data obtained by defining the shape and defining the shape to the CAM unit 200. The shape analysis unit 201, the tool offset surface creation unit 202, and the tool interference check unit 203 of the CAM unit 200 perform the same processing as in FIG. Tool shape command unit 21
The tool shape is supplied to the CAM unit 200 from 0, and the machining process order is supplied from the machining process order designation unit 220. In this way, the tool offset shape data divided for each machining process is sent to the high-speed data processing unit 300 installed on the NC machine tool side via the LAN.

In the high speed data processing unit 300, the CAM unit 2
00, the tool offset shape data divided for each process is temporarily stored in the memory 301.
Based on the data read from 1, the tool path data creation unit 302 creates tool path data. This tool path data is a graphic representing the tool center movement locus, which is so-called CL data. In the post-process section 303, the same post-process processing as described above is performed, converted into an NC program, and the numerical control section 40 in the subsequent stage is processed.
1 to instruct an operation for the machine tool 402. The high-speed data processing unit 300 includes a tool movement path designation unit 310, a corrected tool diameter designation unit 320, and a cutting condition designation unit 3.
30, a start command unit 340 is connected. In the present embodiment, in the high-speed data processing unit 300, when a correction tool or cutting condition change is designated, conversion processing to a corresponding NC program is performed for each machining process. Therefore, unlike the conventional case, a huge amount of reprocessing on the CAM side is unnecessary, and productivity and operability are significantly improved. The high-speed data processing unit 300 and the numerical control unit 401 constitute a tool offset shape data input type numerical control device of the present invention, and further the tool offset shape data input type numerical control machine tool of the present invention including the machine tool 402. Composed.

FIG. 2 is a system configuration diagram of the embodiment shown in FIG. In FIG. 2, the components designated by the same reference numerals as those in FIG. 4 indicate components having the same function.
CAD / CA having a CAD unit 100 and a CAM unit 200
The tool offset shape data is supplied from the M section 1 via the LAN to the high speed data processing section 21 (corresponding to 300 in FIG. 1) provided in each numerical controller main body 2.
The display / input unit 3 is connected to the high-speed data processing unit 21. The display / input unit 3 includes a tool movement path designation unit 310, a corrected tool diameter designation unit 320, a cutting condition designation unit 330, a start command unit 340, etc. in FIG. 1, and displays or inputs information such as an operating state. Or . In the above configuration, the tool offset shape data divided for each machining process is transferred from the CAD / CAM unit 1 to the high-speed data processing unit 21 in the numerical controller main body 2 at high speed via LAN and stored in the buffer memory. Sequentially stored.

The operator designates the tool movement path and the cutting conditions (feed rate, spindle speed, workpiece quality, tool material, etc.) from the display / input section 3, and the start command section 310.
Give a start command from. In the high-speed data processing unit 21, C
A tool path is automatically created according to the specified tool path from the tool offset shape data generated by the AM unit 200, and further, N that matches the form of the machine according to the specified cutting conditions is used.
A C program is created and the NC program is sequentially transferred to the numerical control unit 22. Further, in this embodiment, the machine information on the machine tool side (for example, machine alarm information) is LA.
It is also possible to notify the CAM / CAD side via N.

[0017]

As described above, the tool offset shape data input type numerical control method and apparatus according to the present invention uses the tool offset shape data for each machining process sent from the CAD / CAM side for communication lines such as LAN. It is received by the numerical control device side via the, and the high-speed data processing unit provided on the numerical control device side creates tool path data for the tool offset shape data for each machining process received up to that time, and converts it into an NC program. Since the processing is performed and sequentially transferred to the numerical control unit and processed by the numerical control, the processing time on the CAM side is significantly shortened. Further, even if conditions are specified or changed at the work site, reprocessing is not performed on the CAM side, and the productivity and operability of the processing system are greatly improved. Further, since it is not necessary to store a long NC program, it is economically advantageous.

[Brief description of drawings]

FIG. 1 is a system diagram of an embodiment of a numerical control method for inputting a tool offset shape data according to the present invention.

FIG. 2 is a system configuration diagram of one embodiment of a tool offset shape data input type numerical control method according to the present invention.

FIG. 3 is a system diagram of a conventional processing system.

FIG. 4 is a system configuration diagram of a conventional processing system.

FIG. 5 is a diagram showing an example of a data conversion process from shape data to an NC program.

[Explanation of symbols]

 100 CAD part 200 CAM part 210 Tool shape designation part 220 Machining process sequence designation part 300 High-speed data processing part 310 Tool movement path designation part 320 Corrected tool diameter designation part 330 Cutting condition designation part 340 Start command part 401 Numerical control part 402 Machine tool

Claims (3)

[Claims] 1. A numerical control method for inputting tool offset shape data, which receives tool offset shape data offset by the radius of a tool from shape data of a workpiece to be machined and generates an NC program, wherein each machining step is designated in advance. The tool offset shape data divided into is received and temporarily stored in the buffer memory, and an NC program suitable for the numerically controlled machine tool to be used is stored based on the stored tool offset shape data and the designated tool movement path and cutting conditions. A numerical control method for inputting tool offset shape data, wherein the NC program is generated and sequentially transferred to the numerical control unit of the numerically controlled machine tool. 2. A numerical controller for inputting tool offset shape data, which receives tool offset shape data offset by the radius of a tool from shape data of a workpiece to be processed and generates an NC program, wherein each preset machining step is performed. A buffer memory for receiving and temporarily storing the tool offset shape data divided into, and tool path data creating means for creating tool path data from the tool offset shape data stored in the buffer memory and the designated tool movement path, Post processing means for generating an NC program suitable for the numerically controlled machine tool to be used from the tool path data created by the tool path data creating means and the specified cutting conditions, and sequentially transferred from the post process means Receives the NC program and provides the machine tool with the NC program. A numerical control device for inputting tool offset shape data, characterized in that it comprises a numerical control section for issuing an operation command. 3. A numerical control machine tool for inputting tool offset shape data, which receives tool offset shape data offset by the radius of a tool from shape data of a work to be processed, converts it into an NC program, and processes the work. Creates tool path data from a buffer memory that receives and temporarily stores the tool offset shape data divided for each previously specified machining step, and the tool offset shape data stored in the buffer memory and the specified tool movement path Tool path data creating means, post process means for creating an NC program suitable for a numerically controlled machine tool to be used from the tool path data created by the tool path data creating means and specified cutting conditions, and the post process The NC program sequentially transferred from the means is received and converted into an operation command. A numerical control machine tool for inputting a tool offset shape data, comprising a numerical control unit for converting and a machine tool for performing numerical control machining on a work by an operation command issued from the numerical control unit.