METHOD FOR ESTIMATING CONTACT STRENGTH AND SERVICE LIFE OF CYLINDRICAL METAL-POLYMER SLIDING GUIDES

Abstract

The method of calculation of contact strength and service life of cylindrical metal-polymer sliding guides is given, which is based on the author 's methodology of research of wear kinetics at sliding friction. The influence of load, diameters and radial clearance on the maximum contact pressures in the guide is investigated. Quantitative and qualitative patterns of dependence of their change on the specified factors are established. As the load increases, the initial maximum contact pressures increase as the square root of its change. As the diameter of the base increases, the pressures decrease in direct proportion. In the guide with the bushing made of Moglice there are 30% more pressures, than with the bushing made of DK6. Due to the wear of the polymer composite bushing made of DK6 and Moglice, the initial contact pressures in this tribosystem will decrease. According to the given mathematical model of wear the estimation of influence of wear of the bushing on their change is carried out. The forecast calculation of the resource (durability) of the guide depending on the above factors is also carried out. Quantitative and qualitative regularities of resource dependence on the accepted factors of influence are established. As the load increases, the life of the guide decreases significantly, and its value also depends on the radial clearance in the join, the diameter of the base and the material of the bushing. With increasing radial clearance resource of the guide is reduced by half less than with increasing load. The resource of the guide with the bushing made of DK6 is on average twice as big as the guide with the bushing made of Moglice. The obtained research results are presented in graphical form and summary tables.