具有防皱功能的多点成形工艺数值模拟

介绍了一种无需压边圈的防皱多点成形方法,与目前常用的多点模具成形方法不同,在防皱多点成形方法中防皱单元与调形单元交错排列,离散的防皱单元在成形区内对板料进行挟持,且能够随板料的变形上下浮动。运用有限元方法对球形曲面在防皱多点成形方式中的成形过程进行了数值模拟,分析了板厚、防皱单元的压力对最大成形曲率的影响,并与多点模具成形进行了对比。研究发现,防皱多点成形方法能够很好地抑制板料在成形过程中的起皱现象。球形曲面采用防皱多点成形方式时能够获得明显大的变形量。板料越薄,防皱多点成形方法所能获得的效果越显著。增大防皱单元的压力能够提高防皱多点成形的防皱能力。

Numerical simulation on multi-point sheet metal forming with wrinkle resistance function

A multi-point forming with wrinkle resistance function(MPFWR) was introduced which doesn’t need the edge-pressing ring.This forming mode is different from the common multi-point die forming(MPDF) in that the winkle resistant holders and form adjusting holders arrange alternately.Holding the whole blank in the forming zone,the discrete wrinkle resistant holders can float up and down along with the blank.The forming process of a spherical part in MPFWR was simulated using a finite element analysis software.The effects of the sheet metal blank thickness and the wrinkle resistant holder force on the maximum deformability were analyzed,and the results were compared with those of MPDF.It was found that the MPFWR can restrain the wrinkle of the sheet blank,gives out the obviously larger formability of the spherical part.The thinner of the blank,the better its formability.The wrinkle resistance can be enhanced by increasing the holder force.