摘要
成形精度差是金属板料渐进成形工艺的重要缺陷。针对渐进成形精度评价问题,提出位移误差评价法,即通过确定测量方向上的变形位移来衡量其成形精度。利用误差位移法对一组圆锥形成形制件进行研究,提出渐进成形过程中金属板料回弹和成形工具系统刚度是影响成形制件精度的主要因素。且成形过程中制件成形角一定,回弹一定,成形角变化,回弹变化,回弹量与成形角呈非线性关系。在此基础上,提出提高制件成形精度的解决方案:增加成形工具系统刚度。试验证明补偿回弹和成形工具系统刚度不足引起的尺寸偏差,或者增加成形工具系统刚度,都可显著提高渐进成形制件精度。
Low forming accuracy is an important defect of sheet metal incremental forming process. Aiming at the evaluation of incremental forming accuracy, an evaluation method based on displacement error is proposed, i.e. the forming accuracy is measured by determining the deformation displacement along the measuring direction. Forming accuracy of a set of cone type formed parts is studied by using the displacement error method, and the important influencing factors of the forming accuracy are springback of sheet metal and stiffness of forming tool system, were advanced in this investigation. During the forming process, constant forming angle causes constant springback, varied forming angle causes varied springback, and there is a nonlinear relationship between the forming angle and springback. Based on this, forming accuray improvement methods of the formed parts are indicated： （1） compensating the error size caused by the springback of sheet metal and insufficient stiffness of the forming tool system, （2） increasing the stiffness of the forming tool system. Experiments prove that both （1） and （2） can greatly improve the incremental forming accuracy of parts.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2010年第9期193-198,共6页
Journal of Mechanical Engineering
基金
江苏省自然科学基金资助项目(BK2006190)
关键词
渐进成形
位移误差法
成形精度
回弹
成形工具系统刚度
Incremental forming Displacement error Forming accuary Spingback Stiffness of forming tool system
