本文關(guān)鍵詞： 試驗機(jī)轉(zhuǎn)軸 制動力矩 微動損傷　出處：《西南交通大學(xué)學(xué)報》2017年05期 　論文類型：期刊論文

【摘要】：為了探索扭矩作用下轉(zhuǎn)動軸的微動損傷特性,利用JD-1輪軌模擬試驗機(jī),通過改變載荷大小,研究了制動力矩對轉(zhuǎn)軸與軸承內(nèi)圈過盈配合面微動損傷特性的影響,并借助激光掃描共聚焦顯微鏡和掃描電子顯微鏡觀察損傷表面的磨痕和剖面微觀組織,分析了不同扭矩載荷下轉(zhuǎn)軸表面的微動損傷機(jī)理.結(jié)果表明:在垂向試驗載荷和制動力矩的作用下,試驗機(jī)轉(zhuǎn)軸在與左右兩端軸承內(nèi)圈過盈配合面處出現(xiàn)了微動損傷,磨損形式主要表現(xiàn)為磨粒磨損和粘著磨損;隨著制動力矩的增加,轉(zhuǎn)軸配合面的表面磨損加劇,塑性變形層變厚約75%,微動損傷變得更嚴(yán)重;左端配合面的磨損和塑性變形均比右端嚴(yán)重,兩端配合面處的塑性變形層厚度分布不均;轉(zhuǎn)軸配合面處產(chǎn)生了微裂紋,且左端產(chǎn)生的裂紋多于右端,微裂紋的數(shù)量隨著制動力矩的增加而增多了約6倍,裂紋擴(kuò)展角度也變大約50%.
[Abstract]:In order to explore the fretting damage characteristics of rotating shaft under torque, the influence of braking moment on fretting damage characteristics of interference fit surface of rotary shaft and bearing inner ring was studied by using JD-1 wheel-rail simulation testing machine. Laser scanning confocal microscopy and scanning electron microscope were used to observe the wear marks and microstructures of the damaged surface. The fretting damage mechanism of the rotating shaft surface under different torque loads is analyzed. The results show that under the action of vertical test load and braking torque, the fretting damage occurs between the rotary shaft of the testing machine and the interference fit surface of the inner ring of the left and right ends of the bearing. The wear forms are mainly abrasive wear and adhesion wear, with the increase of braking torque, the wear on the surface of the shaft surface increases, the plastic deformation layer becomes thicker about 75%, and the fretting damage becomes more serious. The wear and plastic deformation of the left side are more serious than that of the right side, the thickness of plastic deformation layer at the two ends of the fit surface is uneven, and there are microcracks at the axis surface and more cracks on the left end than on the right end. The number of microcracks increases by about 6 times with the increase of braking torque, and the angle of crack propagation is about 50%.
【作者單位】： 西南交通大學(xué)牽引動力國家重點實驗室摩擦學(xué)研究所;
【基金】：國家自然科學(xué)基金資助項目(51475393)
【分類號】：TH117.1

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本文編號：1541458