折弯机机械补偿机构疲劳寿命的估算  

Estimation of fatigue life for mechanical compensation mechanism in press brake

作　　者：李堑[1,2] 朱灯林[1] 王金荣[2] 冷志斌 乔根荣 

机构地区：[1]河海大学机电工程学院,江苏常州213022 [2]江苏亚威机床股份有限公司,江苏江都225200

出　　处：《锻压装备与制造技术》2013年第6期46-48,共3页China Metalforming Equipment & Manufacturing Technology

摘　　要：机械补偿机构是金属板材折弯机中普遍使用的挠度补偿机构,它可以减小折弯工件时滑块与工作台挠曲变形带来的不利影响,提高折弯机的制件精度。折弯过程中,折弯机机械补偿机构受到反复挤压与拉伸,容易产生强度和疲劳破坏,机械补偿机构的设计中对其进行疲劳寿命的估算与校核是必不可少的一个环节。本文采用三维弹性接触有限单元法对某型机械补偿机构的折弯过程进行模拟,得出折弯过程中机械补偿结构的最大接触应力,将得到的最大接触应力代入材料的S-N疲劳寿命公式,计算得出补偿机构的疲劳寿命。分析结果表明:该机械补偿机构的疲劳寿命满足设计要求,并与试验结果具有较好的吻合程度。该方法对折弯机机械补偿机构的疲劳寿命的估算与校核具有较大的指导意义。The bending process of some model mechanical compensation mechanism has been simulated by use of three-D elastic contact finite unit method in the text. The maximum contact stress of the mechanism during bending process has been obtained. By putting the maximum contact stress into the S-N fatigue life equation, the fatigue life has been calculated. The resuhs show that the fatigue life of this mechanism can satisfy the design requirement and agree with the test result well, which provides reference for estimation and check of fatigue life of the compensation mechanism for press brake.

关 键 词：机械设计 折弯机 机械补偿机构 接触应力 疲劳寿命 

分 类 号：TG333.26[金属学及工艺—金属压力加工]