Transactions of Materials and Heat Treatment

Title：Experimental research on extruding-bulging of thin-walled elbow with small bending radius and elastic medium

Authors： Ma Yuanyuan1 Qian Weishuang1 Zhang Xiaoyan1 Chen Qinggen2 Xu Xuefeng2 Lin Bingbing2

Unit： 1.AVIC Hongdu Aviation Industry Group 2.School of Aviation Manufacturing Engineering

KeyWords： elastic filling thin-walled elbow with small bending radius extruding-bulging spherical core shaft

ClassificationCode：

year,vol(issue):pagenumber：2016,41(4):31-35

Abstract：

The extruding -bulging of thin-walled elbow with small bending radius by the elastic filling used as medium was conducted, its deformation mechanism and key factors were studied, and the forming process and wall thickness distribution were analyzed. The results show that the elastic deformation and a continuous elastomer are formed by the punch axial and spherical core shaft reverse thrust press to produce expansion force, which makes the tube blank close to the die in the bending and pushes the deformation to flow along the die. In addition, the feeding value of the spherical core shaft is the key parameter for the extruding-bulging with the elastic medium. When it is insufficient, the cross section distortion and the collapse of the exit end are appeared easily. For the push bending of aluminum alloy tube LF2M with Ф32 mm×1 mm, the wall thickness distribution of the formed parts is relatively uniform, and the maximum thinning rate of lateral wall thickness is up to 16% with the feeding value controlled within 75°.

Funds：

中航工业产学研项目资助(BA201306321)；国家自然科学基金资助项目（51405219）

马媛媛(1988-），女，学士，工程师

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