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在设计夹具时,首先必须确定定位方式,考虑和计算定位误差.目前,在计算定位误差时,一般用图解,分别求出工序基准不重合误差△_(基不),基准位置误差,然后用矢量法相加,即可得到.图解直观,容易理解,但它的作图要求准确,不易掌握,容易出现计算错误.而用尺寸链计算法计算定位误差,即可克服这些缺点,能方便、迅速地计算出定位误差,而且还可综合考虑图解法无法考虑的因素.
In the design of fixtures, we must first determine the positioning method to consider and calculate the positioning error.Currently, in the calculation of positioning error, the general use of graphic, respectively, to determine the process of non-coincidence error △ _ (base), the reference position error, and then use Vector method add, you can get graphic intuitive, easy to understand, but its mapping requirements accurate, not easy to grasp, prone to calculation error.With the calculation of positioning error chain dimension calculation method, you can overcome these shortcomings, can be convenient, Quickly calculate the positioning error, but also can consider the graphic method can not consider the factors.