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

LI Huijian¹  SHEN Guangxian¹  LIU Deyi²

(1.College of Civil Engineering & Mechanics, Yanshan University, Qinhuangdao 066004;

2.Beijing City JRT Damper Technical Research Center, Beijing 100055 )

Abstract: 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.

Key words: Oil-film bearing Elastic joint Interference fit Contact stress Multiple boundary element method Fretting damage

CLC No: TH123.4

国家自然科学基金资助项目(50075075). Received 20060210,  received in revised form 20061030