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汽车空调管护套扣压裂纹缺陷分析
英文标题:Withhold crack analysis on sheath of automotive air conditioning tube
作者:李小汝 黄娟 覃才友 
单位:四川工程职业技术学院 
关键词:汽车空调管 护套 扣压工艺 裂纹 
分类号:TG386
出版年,卷(期):页码:2014,39(12):27-30
摘要:

针对汽车空调管路在扣压时出现的护套破裂问题,建立扣压成形的有限元模型并进行数值模拟,模拟分析表明,护套扣压过程中护套口部的不均匀扩张导致了该部分金属的最大主应力超过护套材料Al3003-H12抗拉强度130 MPa,从而在护套口部产生拉裂;通过改变护套形状用以降低其经扣压成形后口部的拉应力值,改变护套形状后扣压时的护套口部金属最大主应力降至100 MPa左右,降幅约为23%。工艺试验结果表明,改进护套形状后可以有效避免护套扣压时的拉裂缺陷,大大降低废品率。

For the problem that the sheath will be cracked when the automotive air conditioning tube withholds, the FEM model of withhold forming was built and numerical simulation was carried out. Simulation analysis shows that nonuniform expansion of the sheath mouth in the process of sheath withholding leads to the maximum principal stress exceeding the material Al3003-H12 tensile strength 130 MPa, so the crack is generated in the sheath mouth. The tension stress of sheath mouth after withhold forming could be reduced by changing the shape of sheath. The maximum principal stress on the sheath mouth during withhold forming dropped to about 100MPa and the decreasing range was around 23%. Processing test results show that the improved sheath can avoid the defects of the sheath crack and reduce the waste rate considerably.

基金项目:
德阳市科技支撑计划资助项目(2012ZZ040-9)
作者简介:
李小汝(1981-),女,硕士,讲师
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