拉弯过程解析计算及仿真实验  

Analytical,Numerical and Experimental Research on the Kinematics of Profile Stretch Bending

作　　者：罗健玺 卢锴钧 张学广 王嘉鹤 邹天下[1] 李大永[1] LUO Jianxi;LU Kaijun;ZHANG Xueguang;WANG Jiahe;ZOU Tianxia;LI Dayong(School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Changchun Railway Vehicles CO. , Jilin Changchun 130062, China)

机构地区：[1]上海交通大学机械与动力工程学院,上海200240 [2]中车长春轨道客车股份有限公司,长春130062

出　　处：《机械设计与研究》2018年第5期136-139,147,共5页Machine Design And Research

基　　金：国家自然科学基金资助项目(51705315)

摘　　要：型材拉弯广泛应用于轨道交通与航空航天领域,但拉弯设备结构复杂,包含多个自由度,往往难以准确实现预定型材变形。本文通过解析推导计算研究了位移控制下的二维张臂式拉弯运动过程,阐述了拉弯机构工艺参数与型材拉弯变形指标间的关系;进而开展了某帽形件的拉弯有限元模拟及实验。结果表明：型材的包覆角由和滑架位置和支臂摆角决定。型材的真实拉伸量由拉伸缸位移和最小拉伸缸位移决定,其中最小拉伸缸位移由滑架位置和支臂摆角决定。由等值线图可得,工艺参数对拉弯变形程度的影响规律是与滑架位置负相关,与支臂摆角正相关。Profile stretch bending is widely used in aerospace fuselage frames and railway coach frames,etc. It is difficult to determine machine parameters due to the complexity and mutiple DOFs of profile stretch bending. The kinematics of swing arm profile 2 D stretch bending was studied based on analytical deduction and numerical computation. The connection between machine parameters and profile deformation extent was analyzed. Futhermore,both simulations and experiments were carried out upon hat-section profile to verify the conclusions below： Both wrapping angle and the minimum displacement of tension cylinder is determined by carriage position and angle of swing arm. Elongation is determined by displacement of tension cylinder and the minimum displacement of tension cylinder.According to contour map,profile deformation extent is positively correlated with angle of swing arm,while profile deformation extent is negatively correlated with carriage position.

关 键 词：拉弯 工艺参数 位移控制 包覆角 拉伸量 有限元模拟 

分 类 号：TG386[金属学及工艺—金属压力加工]