JPH05274021A - Machining system - Google Patents

Abstract

PURPOSE:To improve the productivity and the operability of a system where the NC processing is carried out by means of the output data given from the CAD/CAM. CONSTITUTION:The shape data on a work to be machined that is produced at a CAD part 100 is received at a CAM part 200 where the tool offset shape data is produced being divided for each machining process. These divided tool offset shape data are temporarily stored in a buffer memory 301. Then a tool shift path data is produced from the stored tool offset shape data and a designated tool shift path. Furthermore an NC program accordant with the numerically controlled machine tool to be used is generated under the designated cutting conditions and sent to a numerical control part 401. Then the NC program is converted into an operating command so that the numerically controlled machining is applied to the work of a machine tool 402.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a machining system for performing NC machining using output data from CAD / CAM, and in particular, tool offset shape data output from CAM. The present invention relates to a machining system having an input-type numerically controlled machine tool. [0002] 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. In the tool path creating unit 154, for example, a tool path as shown in FIG. 5C is created based on the above data, and the post-processing unit 155 takes into consideration processing conditions such as the type of processing machine and cutting ability. Then, as shown in FIG. 5D, it is converted into an NC program that defines the movement of the tool for each micro area, and stored in the memory unit 156. 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 the 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 the memory of the unit 8 The NC program is sequentially read and supplied to the numerical controller main body 2. The NC program thus supplied is stored in the communication buffer 25. In addition to the communication buffer 25, the numerical control device 2 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. The NC program read from the communication buffer 25 is sent to the numerical control unit 22 and sequentially subjected to numerical control processing, and the servo control unit 23 performs servo control. 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 supplies a control signal for performing a tool or work replacement operation to the machine tool 6 via the I / O interface unit 7. In the same manner, the DNC device 8 includes NCs for the other numerical control device 2, the servo amplifier 4, the motor 5, the machine tool 6 and the I / O interface section 7.
It is also possible to output a program to control multiple machine tools. As described above, the conventional numerical control method using CAD and CAM and the apparatus using the same are designed to generate shape data in the CAD unit and the CAM unit on the host computer side. , 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. Therefore, an object of the present invention is to provide a processing system having improved productivity and improved operability. In order to solve the above-mentioned problems, the machining system according to the present invention comprises a shape data creating means for creating shape data of a workpiece to be machined, and the shape data creating means. Tool offset shape data creating means for creating tool offset shape data by creating a tool offset surface by offsetting the created shape data by the radius of the tool and a tool offset created by the tool offset shape data creating means A machining system comprising a tool offset shape data input type numerical control machine tool that receives shape data, converts it into an NC program, and processes the work, wherein the tool offset shape data input type numerical control machine tool is Machining process sent from tool offset shape data creation means A buffer memory for receiving and temporarily storing the tool offset shape data divided for each, 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, , A post-process means for generating 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 a specified cutting condition, and sequentially transferred from the post-process means It is composed of a numerical control unit that receives an NC program and converts it into an operation command, and a machine tool that performs numerical control machining on a work by an operation command issued from the numerical control unit. According to the present invention, the tool offset shape data divided from each machining process received from the tool offset shape data creating means is temporarily stored in the buffer memory, and the tool offset shape data stored in the buffer memory is stored. Create tool path data from the specified tool movement path,
Furthermore, an NC program suitable for the numerically controlled machine tool to be used is generated from the specified cutting conditions and sequentially transferred to the numerical control unit, and the received NC program is converted into an operation command to perform numerically controlled machining on the workpiece. CA
The processing time on the M side is greatly shortened, and quick processing is possible even when conditions are specified or changed. The present invention will now be described with reference to the drawings. FIG. 1 is a flowchart showing a processing procedure of an embodiment of a processing system according to the present invention. In this embodiment, the shape data obtained by defining the shape and defining the shape in the CAD unit 100 provided on the host computer side is CA.
It is sent to the M section 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. The tool shape is output from the tool shape command unit 210 and the processing step order is input from the processing step order specification unit 220.
It is supplied to the M section 200. In this way, the tool offset shape data divided for each machining process is
C The data is sent to the high-speed data processing unit 300 installed on the machine tool side. The shape data creating means of the constituent features of the present invention is C
It corresponds to the AD unit 100, and the tool offset shape data creating means corresponds to the CAM unit 200. 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 a tool path. This tool path data is a graphic representing the tool center movement locus, which is so-called CL data. Post process department 3
In 03, the same post-processing as above is applied,
It is converted into an NC program and transferred to the numerical control unit 401 in the subsequent stage, and an operation for the machine tool 402 is instructed. 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 33.
0, the 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, the numerical control unit 401, and the machine tool 402 constitute a tool offset shape data input type numerical control machine tool which is a constituent feature of the present invention. 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. To do. 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,
Sequentially stored in the buffer memory. The operator designates the tool movement path and the cutting conditions (feed speed, spindle speed, work machine quality, tool material, etc.) from the display / input unit 3, and the start command unit 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. As described above, according to the processing system of the present invention, not only the processing time on the CAM side is significantly shortened, but also the conditions are specified and changed at the work site. Even if there is no need for reprocessing on the CAM side, the productivity and operability of the processing system are greatly improved. Furthermore,
It is not necessary to store a long NC program, which is economically beneficial.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram of an embodiment of a processing system according to the present invention. FIG. 2 is a system configuration diagram of an embodiment of a processing system 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 reference numerals] 100 CAD part (shape data creating means) 200 CAM part (tool offset shape data creating means) 210 Tool shape designating part 220 Machining process sequence designating part 300 High speed data processing part 310 Tool movement path designating part 320 Correcting tool Diameter designation part 330 Cutting condition designation part 340 Start command part 401 Numerical control part 402 Machine tool

Claims (1)

What is claimed is: 1. A shape data creating means for creating shape data of a workpiece to be machined, a tool offset surface obtained by offsetting the shape data created by the shape data creating means by a radius of a tool, and a tool interference check. Tool offset shape data creation means for performing tool offset shape data and tool offset shape data input expression for receiving the tool offset shape data created by the tool offset shape data creation means, converting it into an NC program, and processing the work A machining system configured with a numerically controlled machine tool, wherein the tool offset shape data input type numerically controlled machine tool is tool offset shape data divided for each machining process sent from the tool offset shape data creating means. Buffer memory for receiving and temporarily storing And tool path data creating means for creating tool path data from the tool offset shape data stored in the buffer memory and the specified tool moving path, and the tool path data created by the tool path data creating means A post-process means for generating an NC program suitable for a numerical control machine tool to be used from the selected cutting conditions, a numerical control section for receiving an NC program sequentially transferred from the post-process means, and converting it into an operation command; A machining system comprising a machine tool that performs numerical control machining on a workpiece according to an operation command issued from a control unit.