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静压支撑-单点增量成形制件减薄率研究
林允博1,李言1,杨明顺1,柏朗1,赵仁峰1
西安理工大学机械与精密仪器工程学院,西安 710048
摘要:
为解决单点增量成形制件因减薄不均而产生的破裂问题,将静压支撑技术引入到成形过程中进行辅助成形。首先,对静压支撑-单点增量成形机理进行分析,根据减薄程度对制件进行区域划分;然后,利用数值模拟研究不同静压条件下制件各区域的减薄率变化规律;最后,搭建静压支撑-单点增量成形实验平台验证模拟结果。结果表明,Ⅱ区域减薄率沿结点路径增大,在距离板料边缘37.5 mm处达到最大值,且随成形深度增加,减薄率在Ⅱ区域中间位置略有降低,至底端附近又有增加。减薄率随静压参数的增大而减小,实验结果和仿真结果的误差小于5%。相比单点增量成形,静压支撑-单点增量成形技术可以有效提高和控制制件壁厚的均匀性,延缓或避免了制件的破裂。
关键词:  单点增量成形  静压支撑  壁厚减薄率  数值模拟  实验验证
DOI:10.12044/j.issn.1007-2330.2020.01.005
分类号:TG386
基金项目:国家自然科学基金项目(51475366,51805433);陕西省科技计划项目(2016JM5074)资助
Study on Thinning Rate of Static Pressure Support-Single Point Incremental Forming Parts
LIN Yunbo1,LI Yan1,YANG Mingshun1,BAI Lang1,ZHAO Renfeng1
School of Mechanical and Precision Instrument Engineering,Xi’an University of Technology,Xi’an 710048
Abstract:
In order to solve the fracture of single point incremental forming parts due to uneven thining,the static pressure support was introduced into the forming process.Firstly,the mechanism of static pressure support-single point incremental forming was analyzed and the parts were divided into regions according to the degree of thining.Then,the law of thining rate change in different regions under different static pressure conditions was studied by simulation.Finally,the static pressure support-single point incremental forming experimental platform was built to verify the simulation results.The results show that the thining rate of region II increases along the node path and reaches the maximum at 37.5 mm away from the edge of the sheet metal.With the increase of the forming depth,the thining rate decreases slightly in the middle of region II and increases again near the bottom.The thining rate decreases with the increase of static pressure parameters,and the error between experimental results and simulation results is less than 5%.Compared with single point incremental forming,this technology can improve and control the uniformity of the thickness of parts effectively,delay or avoid the fracture of parts.
Key words:  Single point incremental forming  Static pressure support  Wall thickness reduction rate  Numerical simulation  Experimental verification