第42卷第12期 Vol. 42No. 12
特种成形
假压技木
FORGING & STAMPING TECHNOLOGY
关键参数对薄壁简形件充液成形的影响规律
郎利辉，张泉达，孙志莹，王耀（北京航空航天大学机械工程及自动化学院，北京100191）
2017年12月 Dec.2017
以不锈钢321材料为研究对象，进行板材充液成形工艺过程的分析。首先，利用数值模拟的方法，在有初始反胀（IRB）的充液成形基础上，研究了初始反胀高度与初始反账压力的组合形式以及液室压力加载路径对制件成形的影响规律，然后分别研究了有无初始反胀的充液成形过程。最后，通过实验的方法进行验证。结果表明：当初始反胀高度为3.75mm、初始反胀压力为2MPa时，充液结束时板料的最大减薄率为4.803%，在所有结果中最小；无初始反胀时，零件壁厚最大减薄率为 5%；当在充液拉深后期继续加大液室压力时，板料底部发生波动，出现二次变形，与此同时，板料最大减薄率增大。从而验证了合适的初始反胀高度和反账压力可以减小制件壁厚的最大减薄率，液室压力加载路径不同，零件的壁厚分布也不同。
关键词：初始反胀；数值模拟；液室压力加载路径；充液成形；波动性 DOI: 10. 13330/j. issn. 1000-3940. 2017. 12. 011
中图分类号：TG386.3
文献标识码：A
文章编号：1000-3940（2017）12-0051-10
Influenceof keyprocessparametersonthin-walltubeworkpiecein
hydroformingprocess
Lang Lihui, Zhang Quanda, Sun Zhiying, Wang Yao
( School of Mechanical Engineering and Automation, Beihang University, Beijing 100191, China)
Abstract: In order to research the influence of initial rererse bulging height ( IRBH) , reverse bulging pressure ( IRBP) and cavity pres sure loading paths on the hydroforming process of sheet, for the stainless steel 321, an analysis of the hydrofomming prxcess of sheet melal was canried out. Firstly, the influences of the IRBH, IRBP and the cavity pressure loading paths on the forming of part were studied by the method of numerical simulation and based on the hydroforming with initial reverse bulging ( IRB) . Secondly, the hydroforming proces ses with and without IRB were discussed. At last, they were confimed by the experiment. The results show that when the IRBH is 3. 75 mm and the IRBP is 2 MPa, the maximum thinning rate of sheet is 4. 803% in the end of hydrofoming process which is the smallest value in all the results. While the hydroforming process is without IRB, the maximum thinning rate is 5% . However, when the cavity pressure increases continual during the later stage of hydro-mechanical deep drawing, the botom of sheet metal is fluctuating and there is a double-dip defomation on the sheet metal. At the same time, the maximum thinning rate of sheet increases. Thus, it is verified that the maximum thinning rate of wall thickness decreases effectively adpting appropriate IRBH and IRBP, but when the cavity pressure loading path is different, the distribution of wall thickness is different too.
Key words : initial reverse bulging; numerical simulation; cavity pressure loading paths ; hydroforming; fluctuatior
近几年，随着现代工业技术的发展，充液成形技术作为一种柔性成形工艺方法，与传统工艺相比，收稿日期：20170612；修订日期：20170925
基金项目：国家科技重大专项：“高档数控机床与基础创造装备(2014ZX04002 071)
作者简介：邱利辉（1970-），男，博士，教授 E-mail; Lango baaa edu. cn
通讯作者：张泉达（1986-），男，博土研究生万方激据ail:zhangpuandadgu@163,.com
具有成形零件尺寸精度高、表面质量好、模具简单等特点，尤其适用于成形复杂形状的零件，因其所具有的独特优势使其在汽车、航空航天等制造领域的应用不断扩展[1-8]。其中，充液拉深["-11]、热态介质充液拉深[12]和液体凸模主动拉深[13-14]等技术得到了迅速发展。充液成形技术是将液体介质代替刚性凸模或凹模，使板料在柔性介质的压力作用下，贴靠刚性模具并最终成形的过程。充液成形过程中的“流体润滑”与“摩擦保持”效果，提高了板料
特种成形栏目是由北京机电研究所塑性工程技术中心①赞助刊出