【摘要】：本文針對軸承座可再制造性從技術性因子、環(huán)境性因子和經濟性因子等方面對軸承座再制造技術進行了研究,應用常溫冷焊重熔、逆變脈沖電刷鍍和膠粘等特種修復技術,嘗試對軸承座不同的失效形式選擇不同的單一修復技術或復合修復技術,為軸承座再制造提供理論基礎。對軸承座再制造后的質量檢測內容包括硬度,金相組織,結合區(qū)微觀形貌,孔同軸度檢測。主要利用HT250為基體作為試件,模擬磨損情況利用低碳鋼修復后,對試件利用硬度計和掃描電鏡觀察修復區(qū)和基體結合處,修復區(qū)硬度和基體硬度基本保持一致,修復區(qū)組織結構致密,無氣泡、裂紋。結合處長度大約為300Um,基體幾乎無變形。修復區(qū)耐磨性比基體有明顯提高。修復后對軸承座孔的同軸度進行檢測。通過有限元軟件ANSYS對常溫冷焊重熔技術工藝參數(shù)進行了研究,在電極壓力和緊壓時間分別以20N,25N,30N;0.5s,1.Os,1.5s進行了九次仿真模擬實驗,得出不同參數(shù)下等效應力和基體變形的變化規(guī)律。變形基本不隨著參數(shù)的變化而變化,開始時電極壓力越大則等效應力減小,但當超出一個峰值時瞬間增大。而隨之緊壓時間增加等效應力變小,由此得出最佳工藝參數(shù)。結合軸承座再制造修復實踐,本文模擬人工操作手法,設計一臺冷焊半自動進給裝置的樣機,可以提高常溫冷焊重熔焊接效率、緩解工人勞動強度,具有一定的工程實用價值。
[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.
【學位授予單位】：北方工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH16

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