轧机油膜轴承锥套微动损伤机理和多极边界元法  

FRETTING DAMAGE MECHANISM OCCURRED SLEEVE OF OIL-FILM BEARING IN ROLLING MILL AND MULTIPOLE BOUNDARY ELEMENT METHOD

作　　者：李慧剑[1] 申光宪[1] 刘德义 

机构地区：[1]燕山大学建筑工程与力学学院,秦皇岛066004 [2]北京市捷瑞特弹性阻尼体技术研究中心,北京100055

出　　处：《机械工程学报》2007年第1期95-99,104,共6页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(50075075)

摘　　要：为揭示大型轧机油膜轴承等过盈量弹性结合锥套与辊颈粘结事故的产生机理,采用多极边界元法定量描述锥套与辊颈在液压胀形装配过程中的接触应力分布规律,发现锥套与辊颈装配就位时两端区域接触压力高度集中现象,其最大值超过辊颈屈服极限致使辊颈表面生成对应塑性变形的高应力区。通过过盈配合轴套与悬臂轴组成的旋转试验装置,对油膜轴承锥套与辊颈在轧制负荷下进行微动损伤模拟试验,证明辊颈与锥套随着轧辊转动存在相互微动现象,讨论轧制过程中锥套与辊颈两端高接触应力区域微动疲劳损伤导致两者发生粘结的机制。阐明等过盈量弹性结合锥套结构的不合理性,否定原有锥套淬火硬度低而导致粘结事故发生的观点。In order to open out the bonding accident mechanism occurring in the roll neck and sleeve of the oil-film bearing used on large-scale rolling mill, assembled with even interference for elastic joint, the contact stresses and its distributing during the hydro-bulging course of assembly are described quantitatively by the multiple boundary element method. The phenomena of localized contact stress concentration are presented at the two ends of the sleeve after assembling well to the roll neck is discovered. Therefore, the high stress zones corresponded with plastic deformation are presented at the surface of the roll neck because the maximum stress exceeds the yield limit. Using the rotating test set consisted of the cantilever shaft and sleeve by interference fit, the simulation experiments about fretting damage occurred in the roll neck and sleeve are performed under the rolling load. The mutual micro slippages are generated at the ends of contact surface of the roll neck and sleeve, moreover, the mechanism that fretting damage leads to felt at the high contact stress zones between the roll neck and sleeve during the rolling course is discussed. So this sleeve structure, which is assembled with even interference for elastic joint, is not reasonable, and the primary viewpoint that the low quenching hardness caused bonding is negated.

关 键 词：油膜轴承 弹性结合 过盈配合 接触应力 多极边界元法 微动损伤 

分 类 号：TH123.4[机械工程—机械设计及理论]