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ELASTOHYDRODYNAMIC LUBRICATION OF LOGARITHMIC PROFILE ROLLER CONTACTS 被引量:2
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作者 Chen Xiaoyang, Shen Xuejin (Research Institute of Bearings,Shanghai University) Xu Wen, Ma Jiaju (Zhejiang University) 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2001年第4期347-352,共6页
An account of numerical solutions to the isothermal and flooded elastohydrodynamic lubrication(EHL)of a logarithmic profile roller,which is rolling over a flat plane,is given The analysis takes account of sideways fl... An account of numerical solutions to the isothermal and flooded elastohydrodynamic lubrication(EHL)of a logarithmic profile roller,which is rolling over a flat plane,is given The analysis takes account of sideways flow of lubricant in the inlet region of the contact When the results are presented in suitable non dimensional groups,it is shown that more uniformly pressure and shape of the film distributing in axial direction is taken place under light loading As the increase of the load,the end closure is displayed and the oil pressure rises sharply at the ends The seal action formed by the end closure makes the film thickness a little And the minimum film thickness is transferred from the central to the ends and the value is reduced rapidly As the increase of the speed,the end closure becomes much serious The optimum crowning value obtained in EHL state is larger than the design value obtained in elastostatic contact state for the same working conditions In order to verify the correctness of theory,optical interferometry is applied to measure the oil film thickness between a logarithmic profiled roller and a glass plate under pure rolling conditions It is found the agreement between numerical solutions and experiments is very good. 展开更多
关键词 Elastohydrodynamic lubrication(EHL) Logarithmic profile roller Finite line contacts Optical interferom etry measurement
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A study of multi-pass scheduling methods for die-less spinning 被引量:3
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作者 Hai GUO Jin WANG +2 位作者 Guo-dong LU Zi-han SANG Qi-hang WANG 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2017年第6期413-429,共17页
The multi-pass scheduling method is a key issue in die-less spinning for determining the quality of the final products, including their shape deviations and wall thicknesses, and has drawn increasing interest in recen... The multi-pass scheduling method is a key issue in die-less spinning for determining the quality of the final products, including their shape deviations and wall thicknesses, and has drawn increasing interest in recent studies devoted to trying to improve the accuracy of the formed parts. In this paper, two main parameters, roller path profiles and deformation allocations in each pass, are considered in newly proposed multi-pass scheduling and optimizing methods in die-less spinning. Four processing methods with different roller path profiles and with three deformation allocation methods are proposed for investigating the influence of scheduling parameters on product qualities. The 'similar geometry principle for restraining shape deviation' and the 'small curvature principle for maintaining wall thickness' are presented for optimal design of roller path profiles; in addition, the 'uniform allocation principle for maintaining wall thickness' and the 'large deformation principle for restraining shape deviation' are brought forward as suggestions for deformation allocations. Based on these principles, a scheduling method denoted by RF+(FP & EHS) is presented to improve the comprehensive quality of a product of die-less spinning. 展开更多
关键词 Die-less spinning Pass schedules Shape deviations roller path profiles Deformation allocations
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