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10、的计算方法概论钣金零件的工程师和钣金材料的销售商为保证最终折弯成型后零件所期望的尺寸，会利用各种不同的算法来计算展开状态下备料的实际长度。 其中最常用的方法就是简单的 “掐指规则 ”，即基于各自经验的算法。 通常这些规则要考虑到材料的类型与厚度， 折弯的半径和角度， 机床的类型和步进速度等等。总结起来，如今被广泛采纳的较为流行的钣金折弯算法主要有两种，一种是基于折弯补偿的算法，另一种是基于折弯扣除的算法。为了更好地理解在钣金设计的计算过程中的一些基本概念，先了解以下几点：1、折弯补偿和折弯扣除两种算法的定义，它们各自与实际钣金几何体的对应关系2、折弯扣除如何与折弯补偿相对应，采用折弯扣除算法的
11、用户如何方便地将其数据转换到折弯补偿算法3、K 因子的定义，实际中如何利用K 因子，包括用于不同材料类型时K因子值的适用范围二、折弯补偿法为更好地理解折弯补偿，请参照图 1中表示的是在一个钣金零件中的单一折弯。图 2是该零件的展开状态。折弯补偿算法将零件的展开长度(LT) 描述为零件展平后每段长度的和再加上展平的折弯区域的长度。展平的折弯区域的长度则被表示为 “折弯补偿”值(BA) 。因此整个零件的长度就表示为方程 (1) ：LT=D1+D2+BA(1)折弯区域（图中表示为淡黄色的区域）就是理论上在折弯过程中发生变形的区域。简而言之，为确定展开零件的几何尺寸， 让我们按以下步骤思考：1、将折弯
12、区域从折弯零件上切割出来2、将剩余两段平坦部分平铺到一个桌子上3、计算出折弯区域在其展平后的长度4、将展平后的弯曲区域粘接到两段平坦部分之间，结果就是我们需要的展开后的零件of backbone backbone role; to fullstrengtheningmembers youthwork, full play youthemployees in companydevelopment in theof force role; toimprove inde pende nt Commission against corruptionwork level, strengthening o
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