工件曲率对沟槽犁切成形影响的有限元研究

摘要

为了研究工件曲率对犁切过程中沟槽成形的影响,以软件DEFORM为工具,利用有限元法分析不同曲率下犁切沟槽的成形过程.分别比较不同曲率条件下成形的沟槽几何尺寸、有效应力分布和犁切力.采用实验验证了曲率在0.133 mm-1条件下卷曲沟槽的成形.此外,为了分析沟槽成形变化的原因,建立了不同曲率工件的犁切过程系列几何模型.相比于负曲率或平面,正曲率对沟槽成形的影响最为显著.这主要是由犁切刀成形面对沟槽成形过程的影响而造成的.%To investigate the workpiece curvature influence on groove deformation,numerical studies with curvature varying from negative to positive were conducted on copper material.Groove deformations were analyzed,including groove geometry,effective stress distribution and plough force.The curled groove shape whose workpiece curvature was 0.133 mm-1 was validated by experiments.Moreover,a series of geometry models with various curvatures were introduced to analyze the change of groove deformation.The results show that positive curvatures influence groove deformation more intensively than negative or zero curvature.It is mainly due to the action of the tool forming face during plough process.