多道次双点渐进成形数值模拟与实验研究  

Experimentation and numerical simulation of multi-step two point incremental forming

作　　者：曹江[1] 王秋成[1] 邱磊 李宁[1] 魏瑞晖 

机构地区：[1]浙江工业大学机械工程学院,浙江杭州310014 [2]杭州博冷科技有限公司,浙江杭州310019

出　　处：《机电工程》2015年第7期897-902,共6页Journal of Mechanical & Electrical Engineering

基　　金：浙江省自然科学基金重点资助项目(LZ12E05003)

摘　　要：针对多道次双点渐进成形中材料变形规律问题,建立了典型圆锥台件双点渐进成形有限元模型,采用螺旋轨迹对其多道次成形规律进行了数值模拟,对模拟结果中节点坐标和位移、单元应变和壁厚数据进行了提取,分析了成形过程中节点流动、单元应变及壁厚分布规律,并通过在实验板料表面印制圆形网格和制作标记点进行了多道次双点渐进成形实验,对成形零件网格变化、标记点径向移动和零件壁厚进行了测量分析,验证了模拟结果的正确性。研究结果表明,多道次双点渐进成形中材料产生明显的径向流动,且随着成形道次增多而增大,同时,成形道次越多零件壁厚均匀性越好;另外,采用变间隔角度设计方法,可改善多道次双点渐进成形零件壁厚分布均匀性,且随着成形道次增多作用越明显。Aiming at investigate material deformation during muti-step two point incremental forming of sheet metal,a FEM model of two point incremental was established. The spiral toolpath was applied to a typical conical part of muti-step forming,node coordinate value,element strain and thickness date were extracted from simulated results,and the effects of the multi-step on node flow,element strain and wall thickness were analyzed. In order to verify simulation results,the circular grid analysis and smear-mark method were utilized to measure the material deformation of muti-step two point incremental forming experiment,the experiment results have a good agreement with stimulation results.The results indicate that a significant radial direction flow is observed during multi-step two point incremental forming,and the material flow further by adding more forming steps,and the more forming steps,the more uniform thickness of sample is discovered. In addition,the thickness distribution of muti-step two point incremental forming parts can be improved by variable interval angle design approach,the more uniform thickness of parts can be obtained by adding more steps.

关 键 词：双点渐进成形 圆锥台件 多道次 成形角度 壁厚 

分 类 号：TG386[金属学及工艺—金属压力加工] TH142[一般工业技术—材料科学与工程]