Recently, the "Five-Year" 863 Program robot technology theme "CNC key technology and equipment industrialization support technology and application" project "high-speed precision CNC lathe key technology research and development and application" (borne by Nanjing CNC Machine Tool Co., Ltd.) and "improve mid-range The key technology research on the positioning accuracy of CNC machine tools (under the responsibility of Jinan First Machine Tool Group Co., Ltd.) successfully passed the acceptance inspection organized by the Ministry of Science and Technology.
The key to the development and application of key technologies for high-speed precision CNC lathes is through the key points of C-axis precision, tool holder balancing system, car-grinding composite machining technology, machine tool dynamic performance analysis and structural optimization design of high-speed spindle rotary system and turning-milling combined machine tool. The research of technology has basically mastered the related technologies that affect the performance, accuracy and reliability of high-speed precision CNC lathes. The optimized high-speed precision CNC lathe spindle has a maximum speed of 8000r/min, and the machining accuracy reaches the international tolerance standard IT5. Meet the needs of a variety of precision parts processing.
All kinds of medium and high-end CNC machine tools developed by the project have sold more than 300 units to the weapons, aviation, automobile and Other industries in the past year, achieving sales income of more than 100 million yuan. The representative product of high-speed precision CNC lathe - CK1420 CNC lathe Small parts are the main processing objects, which can meet the processing of precision parts. It has been used for the grinding of cars. It has once received 29 orders from users. It has been promoted and applied in textile machinery, precision connectors and precision molds. The high-speed precision CNC lathe field has been monopolized by foreign companies; large-scale high-efficiency CNC lathes such as CK1463 and CK1480 have been applied in many military enterprises in China, especially in the artillery production enterprises, which have replaced similar imported machine tools and saved a lot of foreign exchange for the country; N The -094 CNC grinding and grinding machine tool is specially developed to meet the machining requirements of the brake discs in the automotive industry. It can realize the one-time clamping of the workpiece. The two brake surfaces of the brake disc are simultaneously turned by the double knife, and then the grinding wheel is simultaneously ground by the double grinding wheel. The double end ensures the parallelism between the two brake faces and the parallelism between the brake surface and the mounting base.
The topic of "Improving the key technology of positioning accuracy of mid-range CNC machine tools" was carried out in the aspects of improving the static stiffness and dynamic stiffness of the feed system, reducing thermal deformation, improving the sliding performance of the guide rail, reducing the systematic error and random error of the feed system. And research, determined the main factors affecting the positioning accuracy of mid-range CNC machine tools and took corresponding measures; at the same time completed the mid-range CNC lathe rotary tool holder, turning and milling center power tool holder and its attached power tool system and the spindle unit of medium and high-end CNC machine tools, etc. In terms of research, it has also innovated in strengthening the rigid structure of the machine tool and the automatic leveling device.
In the past year, the project has completed the development of 19 new CNC machine tools, producing and selling more than 2,000 mid-range CNC lathes, achieving sales revenue of more than 300 million yuan, and the matching rate of domestic brand CNC systems exceeding 70%; providing weapons and aviation industry. A large number of high-performance CNC machine tools have solved a large number of key technologies, including a J1VMC63A type internal cavity four-axis control high-speed milling and machining center for a defense machinery factory. The machine tool is urgently needed for the defense industry to break the foreign blockade. Developed a machining center specially designed for the machining of the inner cavity of the missile warhead, which solved the development of the 12000 rpm high-speed right-angle milling head, the four-axis linkage inner cavity forward and reverse, the multi-head, and the large lead quadratic curve. A number of technical difficulties, such as the processing technology of semi-prefabricated fragments, in addition to greatly improving the processing accuracy, the processing efficiency is also several times higher than the original process; for the nuclear research unit, J1MAHO800E CNC boring and milling machine and other high-performance CNC machine tools are provided. It is used to process flammable, explosive and radioactive special rare precious metal materials; it provides several MJ-760/MC turning centers for a defense machinery factory. It is used in the composite processing of a certain type of missile body cover. On the parts to be processed, there are processes such as turning, milling, drilling, boring, tapping, etc., which need to be combined, and the complexity and precision of the part profile are high.
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