锻造钩尾框新型斜弯曲模结构的参数

Parameters of Slanting New Bending Die Structure of Frame of Trail Hook Made by Forging

针对锻造钩尾框弯曲生产试制中出现的弯曲力大、框体根部变薄、擦伤和拉裂等问题,采用锻造成形分析软件对弯曲成形过程进行有限元模拟分析。解析弯曲机理,分析缺陷成因,并根据'预弯后二次弯曲'的'分段弯曲'思想,提出一种适用于通用锻造设备的锻造钩尾框斜弯曲模新结构。研究预弯斜度、凹模滚轴直径、凸凹模间隙、凸模圆角半径等因素对最大弯曲力及最大损伤值的影响规律,通过数值分析和实践经验得出合理的结构参数值,消除弯曲成形中可能出现的缺陷,有效降低最大弯曲力,提高弯曲件质量,研究内容最终得到试验验证。

In view of the problems in the bending forging of coupler yokes,such as excessive bending force,thinning,galling and cracking in the root part of yokes,finite element simulation analysis on the bending forming process is carried out by means of a forging analysis software.The bending mechanism and the causes of defects are analyzed.In the light of the idea of ＂segment bending＂,i.e.＂prebending and secondary bending＂,a new structure of skew bending die for forging coupler yokes,which is applicable to universal forging equipment,is proposed.The influences of factors such as prebending slope,concave die roller diameter,gap between concave die and punch,and punch corner radius on maximum bending force and maximum damage value are researched.Rational structural parameter values are obtained through numerical analysis and practical experience,thus eliminating the possible defects in the bending process,effectively decreasing the maximum bending force,and improving the quality of bending parts.Finally,the research contents are verified through tests.