特种修复技术在轴承座再制造中的应用研究

发布时间：2018-07-31 06:21

【摘要】：本文针对轴承座可再制造性从技术性因子、环境性因子和经济性因子等方面对轴承座再制造技术进行了研究,应用常温冷焊重熔、逆变脉冲电刷镀和胶粘等特种修复技术,尝试对轴承座不同的失效形式选择不同的单一修复技术或复合修复技术,为轴承座再制造提供理论基础。对轴承座再制造后的质量检测内容包括硬度,金相组织,结合区微观形貌,孔同轴度检测。主要利用HT250为基体作为试件,模拟磨损情况利用低碳钢修复后,对试件利用硬度计和扫描电镜观察修复区和基体结合处,修复区硬度和基体硬度基本保持一致,修复区组织结构致密,无气泡、裂纹。结合处长度大约为300Um,基体几乎无变形。修复区耐磨性比基体有明显提高。修复后对轴承座孔的同轴度进行检测。通过有限元软件ANSYS对常温冷焊重熔技术工艺参数进行了研究,在电极压力和紧压时间分别以20N,25N,30N;0.5s,1.Os,1.5s进行了九次仿真模拟实验,得出不同参数下等效应力和基体变形的变化规律。变形基本不随着参数的变化而变化,开始时电极压力越大则等效应力减小,但当超出一个峰值时瞬间增大。而随之紧压时间增加等效应力变小,由此得出最佳工艺参数。结合轴承座再制造修复实践,本文模拟人工操作手法,设计一台冷焊半自动进给装置的样机,可以提高常温冷焊重熔焊接效率、缓解工人劳动强度,具有一定的工程实用价值。
[Abstract]:In this paper, the remanufacturing technology of bearing seat is studied in terms of technical factors, environmental factors and economic factors, and special repair techniques such as cold welding at room temperature, reverse-pulse brush plating and adhesive adhesion are used. This paper attempts to choose different single repair technology or composite repair technology for different failure forms of bearing seat, which provides theoretical basis for bearing seat remanufacture. The quality test of the bearing seat after remanufacturing includes hardness, metallographic structure, micromorphology of the combined zone, and the coaxiality of the pore. Using HT250 as the base material, the hardness of the repair zone and the matrix bond were observed by hardness meter and scanning electron microscope. The hardness of the repair zone was basically consistent with that of the matrix, and the hardness of the repair zone was basically the same as that of the matrix, and the hardness of the repair zone was basically consistent with that of the matrix. The structure of the repair zone is compact, without bubble and crack. The length of the bond is about 300 Um, and the matrix has almost no deformation. The wear resistance of the repair zone is obviously higher than that of the matrix. After repairing, the coaxial degree of the bearing hole is tested. The process parameters of remelting technology in room temperature cold welding were studied by finite element software ANSYS. Nine simulation experiments were carried out at the electrode pressure and the compaction time, respectively, using 20Nb25NU 30NU 0.5sL 1.OsO1.5s, and the variation law of the equal effect force and the matrix deformation under different parameters were obtained. The deformation basically does not change with the change of the parameters. The higher the electrode pressure at the beginning, the smaller the equivalent stress, but the more the peak value is, the more the equivalent stress increases. With the increase of compaction time, the equivalent stress becomes smaller, and the optimum process parameters are obtained. Combined with the practice of remanufacture and repair of bearing seat, this paper simulates manual operation and designs a prototype of cold welding semi-automatic feed device, which can improve the efficiency of remelting welding at room temperature, ease the labor intensity of workers, and has certain engineering practical value.
【学位授予单位】：北方工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH16

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