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题目:偏心螺杆总成,加工工时11h,各零件材质均为45钢。在C620型车床上,使用四爪卡盘加工零件。 1.偏心螺杆总成(图1)特点分析 装配图按常规装配,要保证装配后136±0.05mm和69±0.05mm的公差是比较困难的。必须事先精心设计并分配公差和合理修整。从各零件图分析:要保证136±0.05mm可修整偏心套2;要保证69±0.05mm可修整锥套3,这是因为梯形螺母5、本体4和小螺母1其长度上都有公差要求,所以要考虑周到。
Title: Eccentric screw assembly, working hours 11h, the parts are made of 45 steel. On C620 lathes, parts are machined using a four-jaw chuck. 1. Eccentric screw assembly (Figure 1) Features Analysis Assembly drawings assembled according to conventional, to ensure assembly of 136 ± 0.05mm and 69 ± 0.05mm tolerance is more difficult. It must be carefully designed in advance and assigned tolerances and reasonable trimming. From the parts diagram analysis: to ensure that 136 ± 0.05mm trim eccentric sleeve 2; to ensure that 69 ± 0.05mm trim sleeve 3, which is because of the nut 5, the body 4 and the nut 1 has its length tolerance requirements , So be considerate.