基于最优化瞬心线的纯滚剪切机构设计  

Design of rolling shear mechanism based on optimal centrode

作　　者：刘彪[1] 马雅丽[1] 王德伦[1] 黎康康 

机构地区：[1]大连理工大学机械工程学院,辽宁大连116024

出　　处：《大连理工大学学报》2018年第1期17-24,共8页Journal of Dalian University of Technology

基　　金：国家自然科学基金资助项目(51275067);"八六三"国家高技术研究发展计划资助项目(2006AA04Z101)

摘　　要：在研究纯滚剪切运动特性的基础上提出一种纯滚剪切机构设计新方法.该方法综合考虑开口度、剪刃重叠量、剪切力峰值等设计要求,以机构瞬心线与剪刃廓线具有最小误差为目标建立机构的尺度综合模型,并使用遗传优化算法求解获得最优化的机构尺寸参数,其实质是建立纯滚运动的动、定瞬心线与刚体接触廓线关系模型.七连杆式滚剪机优化设计中的应用实例表明,新设计方案的上剪刃动态最低点迹线点集标准差降低了81.4%,同时上剪刃水平滑移量和剪切力峰值显著减小,这有利于提升钢板剪切质量和滚剪机的动力性能,降低剪刃磨损,延长使用寿命.A new method for designing rolling shear mechanism is presented based on the study of the motion characteristics of the rolling shear.A dimensional synthesis model considering opening degree,overlap amount of blade and peak of shear force is established to obtain the minimum error between the centrodes and the profiles of the blades.The essence of the proposed method is to establish the relation of the moving/fixed centrodes and the contact lines of the bodies.The mathematical model is solved using the genetic optimization algorithm to obtain the optimal mechanism dimension.The result obtained from an application on the design of a seven-bar linkage mechanism shows that the standard deviation of the trajectory set of the lowest moving point on the upper shear blade is reduced by 81.4%,and the sliding of the upper blade and the peak of the shear force decrease dramatically.That means the promotion of shearing quality and power performance,as well as less wear of the blades and long service life.

关 键 词：纯滚剪切 位置综合 瞬心线 优化算法 数学模型 

分 类 号：TG333[金属学及工艺—金属压力加工]