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前言汽车发动机罩是汽车车身部份的主要零件。作用:(1)美观;(2)保护发动机;(3)和前围外盖板、前围左右侧板、左右侧板等组成车身整体。工艺:落料、拉延、修边、翻边、摺边和压字。翻边工序是整个工序中最复杂的一道工序,模具也是最复杂的一套摸具。当前国内外对大揭盖式的发动机罩翻边工艺存在几种不同见解:有一次翻边工艺;几次翻边工艺。苏联著《冲模的设计与制造》一文中提到二次翻边工艺。目前国内外一次翻边车型,如南汽Nj130,二汽EQ240,苏联的吉尔131及美国一些样车,翻
Foreword Automotive hoods are the major components of a car’s bodywork. Role: (1) beautiful; (2) to protect the engine; (3) and the outer edge of the front cover, around the left and right side panels, left and right side panels and other components of the overall body. Technology: blanking, drawing, trimming, flanging, folding and pressure words. Flanging process is the most complicated process in the entire process, the mold is the most complex set of touch tool. At present, there are several different opinions on the flanging process of the hood with large uncovering type at home and abroad: once flanging process and several flanging processes. The Soviet Union with “die design and manufacturing” article mentioned in the second flanging process. At present, a turning model at home and abroad, such as NAC Nj130, two steam EQ240, the Soviet Union Jill 131 and the United States some samples, turned