油缸用35鋼銷軸斷裂的原因

油缸用35鋼銷軸斷裂的原因Reason for Fracture of 35 Steel Pin of Oil Cylinder

某型銑刨機(jī)擺臂油缸用35鋼銷軸在使用約2 a時(shí)發(fā)生斷裂，采用化學(xué)成分分析、硬度檢測(cè)、顯微組織和表面形貌觀察、有限元模擬、斷口分析等方法探討了銷軸斷裂的原因。結(jié)果表明：此銷軸為多源疲勞斷裂，斷口平整，裂紋源位于銷軸表面加工刀痕的根部；造成銷軸斷裂的原因是其加工表面粗糙，刀痕根部應(yīng)力集中，在工作載荷的作用下銷軸中部的刀痕根部形成了裂紋源；同時(shí)銷軸未按要求進(jìn)行調(diào)質(zhì)熱處理，導(dǎo)致其顯微組織粗大，疲勞裂紋容易擴(kuò)展。

The 35 steel pin for an oscillating arm oil cylinder of one type milling machine fractured after service for around 2 a. The reason for the pin fracture was studied by the methods such as chemical composition analysis, hardness test, microstructure and surface topography observation, finite element simulation and fracture analysis. The results show that the batch of pins had a multi-source fatigue fracture. The fracture surface was smooth and the crack source was located in the root of the turning tool mark on pin surface. The main reason for the pin fracture was that the machining surface of the pin was rough and the stresses were concentrated in the root of tool mark, leading to the formation of crack source in the tool mark root of the central pin under the working load. Meanwhile the pin was not subjected to quenching and tempering as required, resulting in the coarse microstructure and the easy propagation of fatigue cracks.

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