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图1所示的双曲面蒙皮钣件,结构刚性差、外形复杂。此件铆接装配传统工艺是以骨架为基准的,即首先将骨架装配好,再把蒙皮钣件贴在骨架上,首尾连接在一起。这种工艺方法尽管把骨架零件制造精度控制得很严,但是,由于以骨架为基准,铆接装配后,蒙皮钣件流线度在0.8～1.0mm之间,很难保证产品的总装要求。随着塑料工业的迅速发展,我厂设计了如图2所示包络式装配夹具(以下简称包络夹具)。夹件定位件采用层压成形新工艺,用环氧树脂塑造。装配时以蒙皮钣件外形为基准,被铆接的全部零件完全安装在定位
Figure 1 shows the hyperboloid skin sheet metal parts, the structure of poor rigidity, complex shape. This riveting assembly of the traditional process is based on the skeleton, that is, the first assembly of the skeleton, then the skin sheet metal attached to the skeleton, the end connected together. Although this kind of craft method controls the manufacturing precision of the skeleton parts very strictly, it is difficult to guarantee the assembly requirements of the products because the flow of the skin sheet parts is between 0.8 and 1.0 mm after the riveting and assembly is based on the skeleton. With the rapid development of the plastics industry, I plant design shown in Figure 2 envelope assembly fixture (hereinafter referred to as envelope fixture). Clip positioning member using a new forming process, with epoxy molding. Assembly to the appearance of the skin sheet metal as a benchmark, all parts riveted completely installed in the positioning