冷凝管自动弯管机铅垂校直部分设计（外文翻译）.docVIP

History of the development of China National Machinery Abstract: China is the worlds machinery to develop one of the earliest countries. In ancient China there are many mechanical inventions, in modern times, Chinas machinery has also been rapid development. ? Key words: small solid machinery, heat treatment, forging, casting, heat processing ? China is the worlds machinery to develop one of the earliest countries. Chinas mechanical engineering technology not only has a long history and brilliant achievements made, not only on Chinas material culture and socio-economic development has played an important role in promoting, but also in the world of technical civilization, made a significant contribution to progress. The traditional machinery, China in a very long period of time have lead the world. Due to the modern times, especially early 18th century from the 19th century, 40s, as a result of such economic and social reasons, Chinas machinery industry is stagnant, more than 100 years in this time is the Western bourgeois political revolution and the industrial revolution period, the rapid development of mechanical science and technology, far exceeding the level of China. In this way, the level of development of the China National Machinery and the gap with the West to widen sharply to the mid-nineteenth century has been more than a hundred years behind the West. New China, especially after the past three decades, Chinas machinery fast development of science and technology. Mechanical products to the large-scale, precision, and automation and sets the trend of development. In some areas has reached or exceeded the worlds advanced level. In general, at the present time Chinas achievements in mechanical science and technology is enormous, and the rapid development of high level is unprecedented. Not the end of this period, Chinas machinery of science and technology will provide a higher level. As long as we can take the correct principles, policies, laws ma