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一、前言 随着经济形势和科学技术的发展,世界各国的产业结构不断进行着调整。经济发达国家热衷发展技术密集型产品,而劳动力密集型产品和能源消耗高、环境污染大的产品(如钢铁、造船、化工等)正向发展中国家转移,这一趋势都十分明显。大型铸锻件也属这一类型。 美国是世界上经济最发达的国家之一,当前,其热衷发展的是航空与航天技术,半导体与电子技术,医疗器械和牙科机械等。
I. Introduction With the economic situation and the development of science and technology, the industrial structure of various countries in the world is constantly adjusted. Economically developed countries are keen on developing technology-intensive products, and the trend is clear when labor-intensive products and products with high energy consumption and high environmental pollution (such as steel, shipbuilding, chemical industry, etc.) are being transferred to developing countries. Large castings and forgings are also of this type. The United States is one of the most economically developed countries in the world. At present, the United States is keen to develop aerospace and aerospace technology, semiconductor and electronic technology, medical equipment and dental machinery.