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在机械加工中,不少工件采用“一面两销”的定位夹具,然而在设计和使用时,往往出现以下图示的结构和布置,造成夹具不能工作。这是什么原因?请从夹具定位原理分析和纠正。 1.工件大孔以一大圆柱短销,工件对称位置的两个小孔以一圆柱短销和一菱形短销,为什么不能装入工件? 2.工件大孔以一大圆柱短销、工件小孔以一小菱形短销,以图示布置时,为什么不能装入工件?
In machining, many workpieces adopt the “one side and two pins” positioning fixtures. However, when designing and using, the structures and arrangements shown in the following diagrams often appear and the fixtures can not work. What is the reason? Please analyze and correct from the fixture positioning principle. 1. Workpiece big hole to a large hole short pin, the workpiece symmetrical position of the two holes to a cylindrical short pin and a diamond short pin, why can not be loaded into the workpiece? 2. The workpiece hole to a large short cylindrical pin, the workpiece Small holes to a small diamond-shaped short, to the layout, why can not be loaded into the workpiece?