Intelligent and numerical control system based on STEP-NC

Abstract

An intelligent and numerical control system based on STEP-NC is arranged on a machine tool body in a connected mode, and is composed of a computer control device, a machine tool controller, a driver, a servo device, an interface and a machine tool monitoring device, wherein a machine tool processing and controlling unit is respectively connected with the computer control device and the driver, and the driver is further connected with the servo device through the interface; the servo device is arranged on the machine tool body in a connected mode; and the machine tool monitoring device is respectively connected with the computer control device and the machine tool body. The intelligent and numerical control system based on the STEP-NC is favorable for free access and data sharing of processed data flow, bottleneck effect between CAD / CAM and CNC also does not exist, and production cycles of products are greatly shortened. The intelligent and numerical control system based on the STEP-NC is of important economic significances and significant social benefits.

Description

technical field [0001] The invention relates to the technical field of overall structure design and application of a STEP-NC-based numerical control system, and in particular provides a STEP-NC-based intelligent numerical control system. Background technique [0002] In the existing technology, in order to improve processing quality and processing efficiency, modern metal cutting machine tools generally adopt numerical control technology. Numerical control machine tools have been widely used in various production fields such as aviation, aerospace, national defense, and machinery manufacturing, and are the basis of the equipment manufacturing industry. As the core of CNC machine tools, numerical control technology is a high-tech developed by various countries. Its technology is complex and difficult to study. Compared with western developed countries, there is still a big gap in my country's research in this area. Trying to shorten the gap with western developed countries an...

AI Technical Summary

Problems solved by technology

However, with the continuous improvement of processing efficiency and processing quality requirements, the inherent disadvantages of the CNC system developed in accordance with the ISO6983 data interface standard are increasingly exposed, mainly in the following aspects: ① Insufficient flexibility and intelligence high

Since this interface uses G / M codes to describe the processing of parts, it mainly provides low-level information such as the movement track and speed of the tool center to the system, but does not include the geometry and process information of the parts, so it is difficult to realize in the system Compensation of 3D Tool Shape Dimensions and Machining Allowance

When the actual working conditions are inconsistent (such as tool size changes), the original program cannot be used, and the operator cannot intervene online

In addition, due to the lack of description of high-level information such as the geometry and process of the processed parts in the program, the entire system is only a passive actuator, lacking flexibility and intelligence

② Product information flows from CAD / CAM to CNC in one direction, making it difficult to share and integrate information

Once the part program is generated, it cannot be changed. When the processing conditions of the workshop level change, it is difficult to feed back the change information to the upstream design department; in addition, because the programming methods of different types of CNC systems and CNC machine tools produced by different manufacturers are different, Therefore, when programming, it is necessary not only to understand the specifications, models, performances, and functions of the selected CNC machine tool, but also to understand the programming manual and instruction format of the CNC system in detail. This strong dependence on the specific CNC system makes the program difficult Portable

Therefore, not only is it difficult to integrate and share information between the system and upstream systems, but it is also difficult to exchange and share information between different systems.

③Does not support spline interpolation function

Using this method has the following disadvantages: first, it will inevitably produce a large number of NC programs (G01) and relatively large approximation errors; Discontinuous, making the originally smooth trajectory curve not smooth

In machining, since the discontinuity of the tool trajectory curve will cause the discontinuity of the feed speed and acceleration, it will lead to a sudden change in the direction of tool movement and force, which will inevitably cause vibration of the machine tool and produce poor surface quality. And speed up the wear of the tool; third, in the CNC system, due to the frequent block processing, it will lead to a long operation time, which will also limit the increase of the feed speed; fourth, in the processing of complex precision parts, the NC code segment The defined displacement is extremely small, and there is a possibility of overcut or undercut during high-speed machining

Therefore, the interpolation technology of the traditional CNC system seriously affects the interpolation accuracy and processing efficiency of surface machining

④ISO6983 data has semantic ambiguity, which cannot guarantee that the data will be correctly recognized and understood by the CNC system

At present, although countries such as Europe and the United States have researched and demonstrated some prototype systems, they are all based on the above-mentioned type 1 and type 2, and they are not intelligent.

Images