初始内压对内高压成形阶梯轴影响的实验研究  

Experimental investigation of initial internal pressure on hydroforming multi-stepped shaft

作　　者：李洪洋[1] 苑世剑[2] 王小松[2] 苗启斌[2] 王仲仁[2] 

机构地区：[1]清华大学机械工程系,北京100084 [2]哈尔滨工业大学材料科学与工程学院,黑龙江哈尔滨150001

出　　处：《材料科学与工艺》2005年第2期143-145,149,共4页Materials Science and Technology

基　　金：国家自然科学基金资助项目(59975021).

摘　　要：为了探索工艺参数对内高压成形工艺的影响,实验研究了阶梯轴内高压成形中初始内压参数的作用,给出了初始内压的计算公式,完成了不同初始内压情况下的工艺实验,并对起皱、折叠等缺陷的产生原因进行了分析.研究结果表明:内高压成形过程中管坯是在轴向压应力和环向拉应力的共同作用下发生变形;初始内压的选取可参照公式(1)进行估算;对于本文的三台阶阶梯轴,初始内压以30MPa为合理,当该值低于20MPa时将发生折叠失稳,而高于40MPa时将引起成形件的破裂.To investigate the effect of process parameter in tube hydroforming, internal pressure of hydroforming three-stepped shaft was studied experimentally in this paper. The general equation of the calculation of initial internal pressure is developed, corresponding experiment was carried out respectively, and the reasons of failure format, wrinkle and burst, were discussed. It is shown that during the process, blank was formed under axial compression stress and circumferential tensile stress. The selection of initial internal pressure can refer to equation (1) . For the three-stepped shaft of this paper, 30 MPa is reasonable value. When the pressure is lower than 20 MPa it tends to wrinkle, and when the pressure is more than 40 MPa it inclines to burst.

关 键 词：内高压 初始内压 阶梯轴 

分 类 号：TG301[金属学及工艺—金属压力加工] TG394