基于有限元的板料成形中过度减薄的研究与优化  

Research and optimization of the excessive thinning for sheet forming based on finite element analysis

作　　者：汪铁丰 林贤坤[1] 秦文东[1] 黄兴琼 

机构地区：[1]广西科技大学,广西柳州545006 [2]万向钱潮传动轴有限公司,浙江杭州311200

出　　处：《锻压技术》2014年第12期151-155,共5页Forging & Stamping Technology

基　　金：广西柳州市科学研究与技术开发计划项目(2013G010601);广西自然科学基金资助项目(2012GXNSFAA053208);广西区教育厅立项项目(LX2014197);广西科技大学科学基金资助项目(校科自1307120)

摘　　要：针对薄热浸铝镀层钢板冲压过程的过度减薄、起皱等问题,对冲压成形后的汽车发动机隔热罩进行板料厚度值的试验测试分析,利用Autoform软件对其冲压成形过程进行有限元模拟仿真。以减薄率为优化目标,对摩擦系数、压边力、拉延筋拉延系数等参数进行优化设计。研究结果表明:优化后的板料减薄率均有所下降,板料最大厚度减薄由仿真前的-29.75%降至-25.71%,达到零件所要求的5%^-26%,优化效果明显;优化后的摩擦系数由0.135下降为0.1328;拉延系数从0.5下降为0.415,压边力从100 k N增加到114.315 k N。因此,根据有限元模拟优化结果对薄热浸铝镀层钢板的冲压工艺进行优化改进,可以有效预防钢板冲压成形中缺陷的产生。For the excessive thinning and wrinkling defects in the stamping process of the hot-dip aluminum-coated steel sheet, the thickness of the sheet was measured for engine shroud of automobile formed, and the stamping process was simulated by the finite element analysis with Autoform software. The thinning rate was selected as the optimization goal, meanwhile friction coefficient, blank holder force, drawbeads, drawing factor and other parameters were optimized. Research results show that the thinning rate of sheet declines after optimization, and the maximum thinning rate decreases from -29. 75% to -25.71% which reaches the requirement of the part thinning rate from 5% to -26%. The effect of optimization is evident. After optimization, the friction coefficient decreases from 0. 135 to 0. 1328, drawing coefficient decreases from 0. 5 to 0. 415, BHF increases from 100 kN to 114. 315 kN. Thus, the stamping process of the hot-dip aluminum-coated steel sheet is improved by the finite element simulating optimization, and effectively in preventing defects produced in steel stamping process.

关 键 词：发动机隔热罩 冲压成形 减薄率 起皱 AUTOFORM 

分 类 号：TG386.41[金属学及工艺—金属压力加工]