多点复合渐进成形与单点渐进成形的对比分析

摘要

为提高金属板材渐进成形的成形质量、成形精度、成形效率和成形极限,了解不同渐进成形工艺对制件成形性能的影响,本文以典型方锥台制件为研究对象,利用有限元软件MSC.Marc对2种渐进成形工艺进行了三维建模,对比分析了单点渐进成形和多点复合渐进成形对制件等效塑性应变、厚度分布和成形精度的影响.数值模拟结果表明:单点渐进成形的等效塑性应变和厚度减薄主要集中在制件相邻侧壁间的拐角处,而多点复合渐进成形的等效塑性应变和厚度减薄均匀地分布在制件成形区;相同成形工艺参数下,相比单点渐进成形,多点复合渐进成形更有利于制件的成形效率、成形质量、成形精度和成形极限的提高,更有利于抑制破裂等失稳现象的产生.2种渐进成形工艺的成形试验表明,数值模拟结果与试验相符.%To improve the quality, accuracy, efficiency and forming limit of incremental forming(IF), and understand the influence of different IF technology on the metal formability, Single point incremental forming (SPIF) and multi-point composite incremental forming ( MPCIF) were used to form the typical truncated pyramid-shaped work-pieceon using 3D finite element analysis model. The equivalent plastic strain, thickness distribution and dimensional accuracy were analyzed. The simulation results indicate that the maximum equivalent plastic strain and minimum thickness occur at the corner of the parts in the process of IF, and are evenly distributed at all the forming zone; With the identical forming process parameters, compared with MPCIF show many advantages over the improvement of the quality, accuracy, efficiency and forming limit, and the control of instability such as rupture, compared to IF. The tests of SPIF and MPCIF show that the simulation results agree with the experimental results.