Optimal design method for guaranteeing motion reliability of cam mechanism

Abstract

The invention provides an optimal design method for guaranteeing the motion reliability of a cam mechanism. The method comprises the steps of 1 analyzing the influences of basic size errors and kinematic pair clearance errors on the movement precision of the disc-shaped cam mechanism, and establishing a mathematical model of the movement reliability R and the reliability sensitivity S sigma (i) ofthe swing push rod disc-shaped cam mechanism considering the two errors; 2 optimizing the model according to the requirements of the disc-shaped cam mechanism; determining various parameter optimization ranges, allowable size errors, distribution types and other indexes of the swing rod length l, the roller radius r, the distance a between the axis of the cam shaft and the swing rotation center,the hinge kinematic pair gap zg, the distance b between the contact point of the cam and the roller and the axis of the cam shaft in the disc-shaped cam mechanism, and establishing a contour curve equation of the disc-shaped cam mechanism; 3 optimizing each parameter combination in the solution space by using an improved sine and cosine algorithm, and taking the minimum reliability value of the disc-shaped cam mechanism within one circle of motion as an evaluation standard to obtain an optimal parameter combination; and 4 providing reasonable improvement suggestions for the disc-shaped cam mechanism model according to the conclusion obtained in the step 3.

Description

technical field [0001] The invention belongs to the field of mechanical design and manufacture and its automation, and in particular relates to an optimal design method for ensuring the reliability of the movement of a cam mechanism. Background technique [0002] With the maturity of structure and mechanism reliability analysis methods, design theory and other related safety theories, accidents caused by strength failure of disc cam mechanism components have become less and less. In contrast, the kinematic precision problem of disc cam mechanism is becoming more and more prominent. Due to the errors of size, clearance, wear and other errors in the components, the motion errors of each component are uncertain, resulting in a decrease in motion accuracy. Therefore, in order to ensure the motion accuracy of the disc cam mechanism, it is particularly important to analyze the error and calculate the reliability quantitatively. [0003] Intelligent optimization algorithm is an e...

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Problems solved by technology

[0004] Purpose of the invention: In order to maximize the motion reliability of the disc cam mechanism under the condition of considering the basic size error and the gap error of the kinematic pair, and to improve the problems that the existing standard sine-cosine algorithm is prone to premature maturity and easy to fall into local optimum in the later stage of iteration, a new method is proposed. A Sine-Cosine Algorithm Embedded in Boundary Buffer Strategy

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