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普通计算尺寸链的方法有两种,即极值法(或称极大极小法)和概率法。用极值法计算尺寸链的基本公式如下: 1.基本尺寸之间的关系(A表示基本尺寸) A_△=sun from i=1 to m A_i-sun from i=m+1 to n-1 A_i…………(1)式中:A_△—封闭环的基本尺寸;A_i—组成环的基本尺寸。下角符号△表示封闭环,i表示组成环;(1～m)为尺寸链中的增环,(m+1)～(n-1)为尺寸链中减环;n为尺寸链中总环数(下同)。 2.平均尺寸之间的关系(A_m表示平均尺寸)
There are two common methods for calculating the size chain, namely the extreme value method (also known as minima) and the probability method. The basic formula for calculating the size chain by the extremum method is as follows: 1. The relationship between the basic dimensions (A represents the basic size) A_ △ = sun from i = 1 to m A_i-sun from i = m + 1 to n-1 A_i ............ (1) Where: A_ △ - the basic size of the closed loop; A_i- basic dimensions of the ring. (1 ~ m) is an increasing ring in the dimension chain, (m + 1) ~ (n-1) is the ring reduction in the dimension chain; n is the total ring in the dimension chain Number (the same below). 2. The relationship between the average size (A_m means the average size)