Development of domestic CNC system and its application in mid-range machining center

The popular mid-range CNC system is the main body of China's machine tool market demand, and also the basis for the optimization of CNC machine tool industry structure. At present, the domestic CNC system industry is facing a very severe situation. More than 80% of the domestic high-end CNC systems and CNC machine tools rely on imports, and the development of the CNC system industry is seriously lagging behind, which has become a bottleneck restricting the development of China's manufacturing industry.

The 863 project “Development of Domestic CNC System and Its Application in Mid-Range Machining Center” undertaken by Wuhan Huazhong Numerical Control Co., Ltd. and Beijing Electromechanical Institute High-tech Co., Ltd., through the key to three-axis and three-axis machining centers The technical research, pilot test and batch matching with the domestic mid-range machining center make the function, performance and reliability of the domestic CNC system reach the advanced level of the international similar products, laying a foundation for the large-scale production of the domestic mid-range CNC machining center.

I. Innovative technical route and research results "The development of domestic CNC system and its application in the mid-range machining center", aiming at the advanced level of foreign CNC systems and machining centers, adopting innovative technical routes: First, to soft Hard, simplify hardware, guarantee product quality; second, establish an open platform, adapt to user personalized requirements; third, complete technology, reduce costs, improve competitiveness; Fourth, adhere to the rapid development of phase research results, development A new CNC system that adapts to market development. In the integrated design, development and production process system of the key components of the CNC system and the machining center, six major breakthroughs have been made.

High-quality, high-performance, highly integrated Century Star HNC-21/22 CNC system The medieval star HNC-21/22 series CNC system adopts advanced open architecture, built-in high-performance 32-bit embedded industrial PC, CNC unit integration The feed axis interface, spindle interface, handheld unit interface, PLC interface and network communication interface are integrated, featuring high performance, flexible configuration, compact structure and high reliability. It can control 6 feed axes, and the maximum number of linkage axes is 6 axes. It can be matched with CNC machine, turning center, CNC milling, machining center, CNC special machine, turning and milling machine tool.

HSV-16D full digital AC servo drive unit HSV-16D full digital AC servo drive unit integrates power module and drive module, adopts the latest motion control dedicated digital signal processor (DSP), large-scale field programmable logic array (FPGA) And the latest technology design such as intelligent power module (IPM), featuring compact structure, beautiful appearance, convenient use and high reliability.

HSV-20S all-digital AC servo spindle drive unit HSV -20S all-digital AC servo spindle drive unit adopts AC380V power supply for direct input, eliminating the need for common servo transformers. It has the characteristics of compact structure, flexible control, convenient use and high reliability. HSV -20S all-digital AC servo spindle drive unit also has high acceleration and deceleration response performance and wide power selection range, which can form a highly reliable and high performance AC spindle drive system according to requirements.

GK6 AC permanent magnet synchronous servo motor GK6 AC permanent magnet synchronous servo motor uses high-performance rare earth permanent magnet material to form air gap magnetic field, controlled by pulse width modulation inverter, with good torque characteristics and wide speed range. GK6 series motors adopt self-cooling type and the protection grade is IP64-IP67. GK6 series motors have wide adaptability to grid fluctuations and can be widely used in the motion control field of CNC machine tools.

GK7 series AC servo spindle motor GK7 series AC servo spindle motor adopts F-class special insulation structure, complete machining and high-precision dynamic balance technology. It can be matched with various high, medium and low-grade AC servo spindle drive modules at home and abroad for closed-loop control. Run, you can get higher operating characteristics.

The matching technology of machining center and numerical control system adopts advanced circular interpolation over-quadrant reverse spike compensation technology in the matching technology of machining center and numerical control system. It can test the dynamic characteristics of CNC system and the dynamics of servo drive system. Characteristic test, with blueprint programming function, fault diagnosis function, background editing function and modularization of PLC program of machining center.

Second, the advanced production quality assurance system uses advanced technology to improve the performance and quality of products, is the key to promote the application of domestic CNC systems. Wuhan Huazhong Numerical Control Co., Ltd. is a leading enterprise in the production of CNC systems in China. It has a modern production base, advanced CNC system, servo drive unit production line and CNC electric cabinet assembly workshop. It has established an annual output of various CNC systems 5000. The production capacity of the set. In order to solve the key technology of the function and performance stability of the numerical control system, the research team focused on the following work:

First, establish an advanced production quality assurance system to establish a quality testing center that meets the testing requirements of national standards. It is equipped with more than 150 advanced electromagnetic compatibility and reliability testing instruments, such as fast transient pulse group generators and lightning strikes. Surge pulse generator, electrostatic discharge detector, vibration test bench, impact test bench, high temperature operation laboratory and high and low temperature environment laboratory. Through these effective testing instruments and testing methods, the structure and process of the products have been improved, and the quality control has been strengthened in the production process, and the ISO9001 quality assurance system has been established, which has greatly improved the quality of the products.

Second, the reliability design of the numerical control system was carried out.
The design of the numerical control device adopts standardized, modular and standardized design. The design uses standard and interchangeable components and components as much as possible, taking into account the processability, operability, testing, packaging, storage, transportation and maintenance. The influence of various environments on the numerical control device; strict element, device screening process and assembly process, the use of industrial grade connectors for all elements and devices, and the quality of the circuit board welding and other aspects.
The soft development of CNC system uses special tools for project management, so that the design and modification can be reproduced, recordable and traceable. The software version management method, installation process and inspection process are formulated to prevent the randomness and uncontrollability of software use; The software products are well designed, debugged, and integrated with multiple test procedures to ensure the correctness and checkability of the software products.

Third, the promotion and application of the domestic CNC system supporting processing center At present, Huazhong CNC system has achieved batch matching applications with many domestic processing center OEMs, such as Beijing Electromechanical Institute High Technology Co., Ltd., Anhui Hongqing Precision Machinery Co., Ltd., Dalian Machine Tool Group, Chengdu Topu CNC Co., Ltd., Nantong Zongheng International Co., Ltd., Nanjing Second Machine Tool Plant, Jiangsu Duoling CNC Machine Tool Co., Ltd., Hangzhou Youjia Machine Tool Group, Wuhan Gaoke Machinery Equipment Manufacturing Co., Ltd., etc.

This is an application example of Huazhong CNC system in a typical machining center: Huazhong CNC system supporting Beijing Mechanical and Electrical Institute VMC750E/BV75 machining center, Huazhong CNC system supporting Anhui Hongqing DM4600 machining center, Huazhong CNC system supporting Chengdu Top EVC750 machining center, Huazhong The CNC system is equipped with the Dalian Machine Tool Group VDL600 Machining Center. The main users of the machining center equipped with Huazhong CNC system are Wuhan Xieli Precision Manufacturing Co., Ltd., as well as more than 20 national numerical control teaching demonstrations such as Shanghai Industrial Technology School, Wuxi Vocational and Technical College, Changzhou Light Industry Vocational Technical College and Changchun Vocational and Technical College. Sex training base.

Through the research, development, engineering and industrialization of this subject, more than 110 sets of domestically-made mid-range machining centers such as BV75, BV85 and VMC750E equipped with Huazhong CNC system have been successfully applied in the land of China, playing an important role in socialist economic construction. effect. The research results of this subject also strongly prove that the domestic high-end CNC system has made great progress, initially realized technological innovation and has a strong late-comer advantage. The domestic high-end CNC system is completely possible to achieve a historic breakthrough. Like the domestically produced program-controlled switches, it has regained most of the domestic market from multinational companies.