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美国专利:1975年 6月26日申请;1976年7月6日公布。发明人:Wallwork。专利号(分类):№3967672(B22C15/62) 本发明涉及自动化造型。一般的造型方法,需用砂箱,分别造上箱和下箱,然后合箱。尽管大量采用机械化搬运砂箱,但在占用车间场地和贮存、周转砂箱方面,仍需很大费用。推荐采用无箱造型(实际上已广泛应用),例如采用壳型法。美国专利№2871527中提出:用射压法制造两面都是型腔的型块,这些型块的垂
U.S. Patent: Application, June 26, 1975; published July 6, 1976. Inventor: Wallwork. Patent No. (Classification): № 3967672 (B22C15 / 62) The present invention relates to automated molding. The general modeling method, the need sand box, respectively, made on the box and the next box, and then combined box. Despite the extensive use of mechanized handling of sand boxes, there is still a significant cost associated with taking up shop floor space and storing and turning sand boxes. Recommended boxless modeling (actually widely used), such as the shell method. U.S. Patent No. 2,771,527 states that a mold having two sides of a cavity is formed by a shot press method,