中國(guó)的機(jī)械發(fā)展講義-文庫(kù)吧資料
2025-07-04 23:41本頁(yè)面
【正文】 of extensive than vibrating plate ram, has bee the largest in China in the ramming machinery products. Since 1990s, foreign vibrating plate ram gradually to enter the Chinese market. Vibration shock ramming and vibrating plate ram the successful development in our country, not only for our construction department provides advanced performance of mechanical, laying have achieved good economic benefit and social benefit, and make our ramming mechanical technology into a big step forward, shorten the gap with the advanced world level, promoting the development of paction machine. The mechanical processing: According to the archaeological discovery, hotworking casting in Beijing pinggu, changping and so have proved that the 16th century BC shang dynasty (bronze objects. Ming yongle (14031424 years), Beijing produce worldrenowned Ming yongle great 3ton bell made ( tons) and tower (63 tons of great 3ton bell made of iron clock (25) and the furnace of melting, pit TaoFan model and method of casting. In the 1950s, Beijing based on clay sand castings in manual. In 1955, Beijing first machine tool plant began using leakage mould modelling, doublesided model and iron plate type plate and standard sand box modelling. In 1965, start using plastic model. In 1980, the institute and Beijing municipal electrical factory has successfully developed line frequency coreless bathroom plug stem bottom note type electric insulation casting. In 1982, hospital and Beijing the casting machine research cupola tuyere oxygen blowing technology. 19851988, Beijing institute of machine of floating end face seal ring by die successful test pressure casting process. In 1959, Beijing second metalforming machinery general factory changed (Beijing) built 2500 ton heavyduty hydraulic press. In 1971, the factory produced 6,000 tons, which is then Beijing hydrtesting biggest metalforming equipment. 19681979, Beijing hoisting machine factory has 300 tons of using hydraulic press 2000 tons and create crane and large panel. In the 1980s, Beijing institute of electrical and developed a series of Beijing mould centre highprecision cutting die, the multistage close to or to import mould level, changed Beijing precisi
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