拉压复合连续弯曲成形恒力弹簧数值模拟研究  

Research on numerical simulation of constant force spring in the continuous bending process by compositing stretch and compression

作　　者：李占华[1] 韩静涛[1] 成靖[1] 于春宇[2] 张从发[2] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]北京空间飞行器总体设计部,北京100094

出　　处：《锻压技术》2016年第5期33-39,共7页Forging & Stamping Technology

基　　金：北京空间飞行器总体设计部资助项目(WY-XXJ-XRW026)

摘　　要：恒力弹簧的优异性能依赖于其各位置等自然曲率的特性,而目前的成形工艺中,恒力弹簧稳定化热处理时,受到其自身几何形状的限制,表现出外层自然直径大于内层的偏差,影响了恒力弹簧的精度。为克服这一工艺难点,提出了拉压复合连续弯曲成形的概念,用于此类构件的成形。采用数值模拟的方式,对此方法成形过程进行了分析,对影响成形的关键工艺参数后张力、模具间隙、模具圆角、带材厚度等进行了数值规律研究,并通过试验的方式,对模拟结果进行了验证。该成形方法在传统压弯基础上对带材两侧施加以张力,并通过正反向弯曲,改善了制件的残余应力状态,提高了构件的稳定性。Due to the characteristic of equal curvature of each position,the performance of the constant force spring is excellent. However,due to its geometry constraint in stabilizing heat treatment,it exhibits the bias of outer diameter greater than the inner diameter in the conventional forming process which affects its accuracy. A novel method of the continuous bending by compositing stretch and compression was proposed,and formed workpiece was obtained. Therefore,the above bending process was analyzed by the numerical simulation method,and the key technological parameters such as the post tension,the die clearance,the punch fillet radius and the strip thickness,etc.influencing bending process were studied. And then the simulation results were verified by experiments. On the basis of the compression and bending,the tension was applied at both sides of the strip in the bending method. Furthermore,positive and negative bending were carried out,and the residual stress state was optimized. So the stability of the part was improved.

关 键 词：拉压复合连续弯曲成形 恒力弹簧 板料成形 数值模拟 

分 类 号：TH135[机械工程—机械制造及自动化] TG306[金属学及工艺—金属压力加工]