填充低熔点合金的小直径5A02管推弯成形

Push-bending forming of small-diameter 5A02 tube filled with low melting point alloy

为提高推弯过程中小直径弯曲半径薄壁管的成形质量,改善推弯过程中低熔点合金和管材材料的流变行为,以填充介质为低熔点合金的ID弯曲半径小直径薄壁铝合金管为研究对象,采用ABAQUS有限元数值模拟软件分析均匀润滑和差异化润滑对低熔点合金和管材材料流动的影响,以优化弯管成形质量,并进行实验验证。结果表明:均匀润滑可增加管直端伸出量,但低熔点合金和管材材料流动不匹配,管壁难以与模具型腔贴合。差异化润滑可改变管坯与低熔点合金不同区域的摩擦力大小,有利于调控两者材料合理流动,改善管壁壁厚分布,提高弯管成形质量。

To improve the forming quality of thin-walled tubes with small diameter bending radius in push-bending forming,and improve the rheological behavior of low melting point alloy as well as tube material during the push-bending process,the small-diameter thin-walled aluminum alloy tubes with ID bending radius and with the filling medium of low melting point alloy was taken as the research object,and the ABAQUS finite element numerical simulation software was used to analyze the influence of uniform lubrication and differential lubrication on the flow of low melting point alloy and tube material to optimize the forming quality of bending tube,and the experimental verification was carried out.The results show that uniform lubrication can increase the straight end pushing out amount of tube.But the flow of the low melting point alloy and the tube material does not match,and the tube wall is difficult to fit the mold cavity.Differential lubrication can change the friction in different areas of tube blank and low melting point alloy.It is beneficial to regulate the reasonable flow of the tube material and the low melting point alloy,improve the distribution of tube wall thickness and the forming quality of elbow.