The particularity of low speed and heavy load rolling loadcase makes the elastic deformation of radial journal bearing in rolling mill far more than that of bearing under general loadcase. Instead of deformation matrix algorithm based on conventional Hertz contact theory,3D boundary element method (BEM) is used to exactly calculate elastic deformation between contact bodies,the sample is given to calculate the elastic deformation of radial journal bearing in rolling mill. The deformation field and stress field of contact surfaces between bearing and roll are analyzed,as well as the influence of elastic deformation on lubrication properties of bearing.
WANG Jianmei 1,2 ,ZHAO Chunjiang2,MA Lifeng1,HUANG Qingxue2 YANG Shichun1,YAO Jianbing2,SONG Chunhua1 (1.Taiyuan University of Technology,Taiyuan 030024,China
According to the revised Cailikefu′s rolling shear force formula, motion path equation of spatial seven-bar path was built, and a mechanical model, with the new structural feature of negative offset, was thus successfully established for 2 800 mm heavy shear of some iron and steel company. Shear and bar forces of steel plate, before and after the adoption of negative offset structure, were analyzed, as well as horizontal force component of mechanism that influences pure rolling shear and back-wall push force that keeps blade clearance. It was found that the back-wall push force keeps large even at the time that the maximum rolling shear was obtained; meanwhile, back-wall push force is the most approximate to side forces when 60-100 mm of offset was adopted. Both theoretical results and on-site shear quality show that the negative offset plays an important role in ensuring the stability of pure rolling shear and keeping blade clearance constant.
MA Li-fengHUANG Qing-xueWANG Jian-meiYANG Jian-weiLI YingLI Jin-bao
