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(一)美国一、美国组合机床的生产发展概况美国是生产和发展组合机床最早的国家,也是目前拥有组合机床最多和生产组合机床能力最强的国家。组合机床在美国已有约三十七年的发展历史。1928年美国首先为汽车工业建立了第一批组合机床。1934年Greenle公司又建立了第一条加工气缸体的组合机床自动线。同时期,Natco公司制成了全套(6种规格)液压自驱式动力头,进给力范围为1600～7250公斤,功率范围为2.6～12千瓦。1935年在克里夫兰机床展览会上就有十多个厂商展出
1. The United States 1. Overview of the Production and Development of Combined Machine Tools in the United States The United States is the earliest country in the production and development of composite machine tools. It is also the country that has the most combined machine tools and the most capable of producing combined machine tools. Combined machine tools in the United States has about 37 years of development history. In 1928 the United States first established the first batch of machine tools for the automotive industry. 1934 Greenle company has also established the first processing machine cylinder line combination of automatic machine tools. At the same time, Natco made a complete set (6 kinds of specifications) of hydraulic self-propelled power head, the feed force range of 1600 ~ 7250 kg, the power range of 2.6 ~ 12 kW. In 1935 at the Cleveland machine tool exhibition there are more than a dozen exhibitors