铝合金管坯低熔点塑性介质挤胀成形力学特征

Characteristics and experimental study on extruding-bulging process of aluminum-alloy tube with a low melting point plastic medium

为了揭示管坯低熔点塑性介质挤胀成形力学特征,对铝合金管坯低熔点塑性介质挤胀成形工艺过程进行了研究.将低熔点塑性介质作为传力介质填加到管坯的内腔里,两个水平冲头在挤压管坯的同时挤压管坯内的塑性介质,使其在受挤压过程中自行封闭,自行产生高压,在管坯两端轴向挤压力的共同作用下,最终将管坯挤胀成形为空心构件.研究结果表明:低熔点塑性介质挤胀成形时管坯和塑性介质两种材料同时发生塑性变形,管坯的变形流动是塑性介质的内压和冲头轴向挤压共同作用的结果,采用该工艺可以成形各种异型截面的空心构件.

In order to investigate the mechanical characteristics of aluminum-alloy tube with a low melting point plastic medium, the process of extruding-bulging of aluminum-alloy tube with a low melting point plastic medium was studied. A low melting point plastic material was filled into tube as a pressure-transmitting medium, the tube and plastic medium were extruded by two horizontal punches, and the high inner pressure was exerted during the extruding process. At last, the tube was extruded and bulged to be a hollow part by the inner pressure and axial pressure of the punches. The research results show that plastic deformation of tube and plastic medium are produced at the same time during the extruding-bulging process. Deformation and flow of tube are caused together by the inner pressure of the plastic medium and the axial pressure of the punches. Hollow parts of all kinds can be formed by the extruding-bulging orocess.