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飞机用铝合金弯管类接头折叠缺陷分析及预防
英文标题:Analysis and prevention on folding defect for aluminum alloy elbow joints of aircraft
作者:李晓勇 王富强 叶丽燕 刘志刚 王磊 
单位:郑州四维新材料技术研究院有限公司 沈阳飞机工业(集团)有限公司 中国机械科学研究总院集团有限公司 
关键词:铝合金 弯管接头 模锻件 内转角R处 折叠 
分类号:TG316.3
出版年,卷(期):页码:2021,46(11):83-90
摘要:

 采用断口分析、工艺分析、调查分析、有限元模拟和试验验证相结合的方法,对某铝合金直角管接头内转角R处产生折叠缺陷的机理和原因进行了分析,并提出了有效的预防措施。结果表明:金属在塑性变形过程中的不合理流动是折叠缺陷产生的根本原因;而棒料直接模锻、模具过渡圆角半径较小、模具型腔光滑度不高和修伤控制不严格等是折叠缺陷产生的直接原因。通过采取增加预锻荒形工序、修整模具和加强修伤控制等工艺优化措施,可以大幅降低直角管接头内转角R处产生折叠缺陷的几率,这也是预防弯管类接头内转角R处产生折叠缺陷的有效措施。

 The mechanism and cause of folding defect at the inner turning corner R of an 90° elbow joint for aluminum alloy were analyzed by a combination of fracture analysis, process analysis, investigation analysis, finite element simulation and experimental verification, and the effective measures to prevent the above-mentioned folding defect were put forward. The results show that the fundamental cause of the folding defect is the unreasonable flow of metal in the plastic deformation process, and the direct causes of the above-mentioned folding defect are the direct die forging of bar, small fillet radius of die transition, insufficient smoothness of die cavity and lax control of surface defect cleaning etc. In addition, the possibility of the folding defect at the inner turning corner R of 90° elbow joint is greatly reduced by adopting process optimization measures of adding the pre-forging process, trimming die and strengthening the control of surface defect cleaning, which are also effective measures to prevent the folding defect at the inner turning corner R of elbow joint.

基金项目:
作者简介:
作者简介:李晓勇(1985-),男,学士,工程师,E-mail:xylee08@163.com
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