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管壁异形渐进翻孔及其变形特征分析
英文标题:Specialshaped incremental hole flanging in tube wall and its deformation characteristics analysis
作者:刘克帆 温彤 洪意飞 火小畅 杜康康 
单位:重庆大学 
关键词:渐进成形 翻孔 管材 变形分析 缺陷控制 
分类号:TG386.43
出版年,卷(期):页码:2021,46(1):89-96
摘要:

 结合数值模拟和物理实验,实现了圆管、方管管坯上不同孔形、不同翻孔方向的管壁异形渐进翻孔成形。通过模拟验证了圆管管壁异形渐进翻孔成形过程的受力情况与方管翻孔时不同,各个部分的成形力大小大致相同;在方管中有:圆弧端成形力>过渡端成形力>直壁端成形力的关系。研究发现,破裂、金属堆积、划痕严重、底端凸起等是渐进翻孔可能出现的缺陷类型;通过减小进给量、优化轨迹、增加预翻量、增加润滑等措施,可以控制相关缺陷的产生。此外,由于变形方式的不同,方管管壁异形渐进翻孔的成形力大于圆管翻孔的成形力。圆管管壁异形渐进翻孔的厚度分布没有方管翻孔的厚度分布均匀,但厚度分布规律均是沿着翻孔高度的增加而逐渐降低。

 

 Combining numerical simulation and physical experiments, the special-shaped incremental hole flanging in tube wall with different hole shapes and different flanging directions on the round tube and square tube blanks was realized. Then, it was verified by simulation that the force situation in the special-shaped incremental hole flanging process of round tube wall was different from that of the square tube, and the forming force of each part was about the same. Furthermore, in the square tube, there was a relationship of forming force at the arc end > forming force at the transition > forming force at the straight wall. The research results show that the cracks, the metal accumulation, the serious scratches, the protruding bottom, etc. are the types of defects that may occur in the incremental hole flanging, and the related defects are controlled by reducing the feeding amount, optimizing the trajectory, increasing the pre-flanging amount and increasing lubrication. In addition, due to the different deformation methods, the forming force in the special-shaped incremental hole flanging of square tube is greater than that of round tube, and the thickness distribution in the special-shaped incremental hole flanging of round tube is not as uniform as that of square tube, but the thickness distribution law is gradually decreased with the increasing of the height of flanging hole. 

 
基金项目:
基金项目:国家自然科学基金资助项目(51575066)
作者简介:
作者简介:刘克帆(1994-),男,硕士研究生 E-mail:3115593910@qq.com 通讯作者:温彤(1968-),男,博士,教授 E-mail:wentong@cpu.edu.cn
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