附录英文文献.docVIP

A history of the development of the CNC system, China1 China since 1958, consists of a number of research institutes, colleges and universities and a few CNC machine tool factory started the research and development. Due to the low level of domestic electronic components was restricted economic etc, department, failed to qualify for the bigger development.2 after the reform and opening policy, our country in the numerical control technology has been gradually made substantial development. After period (81-85 years), the introduction of foreign technology (86-90 years) and the digestion and absorption of five-year (91 - a - 95) national organizations of scientific research, and makes our numerical control technology has greatly improved through the national key, and identification of products including acceptance of Everest company in Beijing, huazhong nc company type of huazhong nc type and shenyang upscale blue sky of national engineering research center, and other type state quality supervision by machine test test center of qualified domestically producednumerical control system such as nanjing quarto products.3 our CNC machine manufacturing industry in the 1980s had high-speed development stage, many from traditional product realization to machine tool plant numerical control. But generally speaking, technical level is not high, poor quality, so in the early 1990s faced by the state economic planning economy to market economy, after years of transfer of depression, the most difficult production capacity to 50%, then inventory exceeds 4 months. From the 1 9 September 5 years after the national the ninth five-year plan from the expansion of domestic market, strengthening start machine imported CNC equipment limited approval, the key support key CNC system, equipment, and key technology of CNC equipment production, played a large role in promoting, especially in the 1 9 September 9 years later, national defense industry and the key to civil industrial department