Included In The Wear Of Slidercrank Mechanism Of Tolerance Optimization Design

In the work process, parts of kinematic pair wear can result in decreased performance of endoflife mechanism. Crank slider mechanism is the key components of the press, the rotation of the side of the pin shaft and the shaft sleeve wear will cause the decrease of the accuracy of the straight line movement of the slider in a working process, the service time, wear resulting in failure of the overall function of the mechanism. To guarantee agency service for a period of time after the, precision motion still within the allowable range, this paper from the point of view of tolerance design of under consideration of the side effects of wear mechanism to rotate, the key parts of the agency tolerance optimization design. In this paper, the specific research work is as follows:Firstly, the paper introduces the product quality loss and tolerance optimization design of domestic and foreign research status, a brief summary of the tolerance optimization design at this stage of the research content, are given in this paper, the main research contents and chapters arrangement.Secondly, the kinematic accuracy of the mechanism is studied, and the kinematic accuracy of the crank slider mechanism is established according to the effective length method. Subsequently, to build a threedimensional model of the slider crank mechanism, the simulation calculation parts wear quantity required force curve fitting based on Archard adhesive wear theory to calculate the key parts and components in the mechanism of wear, combined with expression of product quality characteristics, determines the service quality loss model and wear rate is related to the parameters. Consider a slider crank mechanism serving rotating side wear of the change, the establishment of a shaft sleeve and a pin shaft design dimensional tolerances as variables, the sum of product quality loss and manufacturing cost is minimum as the objective function and economic processing range and parts failure rate and linear slider motion precision of the degree constrained tolerance optimization model, then use matlab genetic algorithm to solve, and the results were analyzed.Finally, the kinematic accuracy of the experiment of slider crank mechanism and experiment using grating ruler of slider crank mechanism slider motion accuracy were measured, institutions compared in different under the action of external force, the sleeve different wear degree when the motion accuracy of the changes, then each experimental group parts size is obtained by theoretical calculation the motion accuracy of the results and the experimental measured results were compared.