Probability-theoretical approach to the accuracy of the component assembly of multilink mechanisms

Yuri Shekikhachev,Vladimir Batyrov,Lyudmila Shekikhacheva,Ruslan Balkarov,Nurilla Noraliev,R.Z Abdulkhalikov

doi:10.1051/e3sconf/202126201031

Yuri Shekikhachev, Vladimir Batyrov + Show 4 more

Open Access

https://doi.org/10.1051/e3sconf/202126201031

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Abstract

The technological process, ensuring the accuracy of mechanism assembly is formally a sequential summation of primary manufacturing errors and an analysis of obtained, generalized values to develop and implement specific technological methods to meet process requirements for the accuracy of the relative position of parts. To ensure the accuracy of crank mechanisms for misalignment of piston and cylinder axes, assembled from specific, randomly received component parts, production personnel deal with strictly defined crankshafts, connecting rods, pistons, cylinder blocks, and, consequently, with one or another manufacturing errors. To ensure the accuracy of these parts assembly in a mathematical sense, with such a sequence, will represent nothing more than an algebraic summation of primary errors and compilation of their numerical values with the maximum permissible values. A different situation arises in the implementation of assembly technological processes with automatic achievement of accuracy parameters by varying individual parts from their total number. As in this case fairly representative aggregates are analyzed, the final result of combining parts into assemblies will occur with a greater or lesser probability, especially when the sum of the maximum deviations of constituent links (parts) is not equal and not less than the maximum permissible total values.

Highlights

The release probability from the assembly site of high-quality products with automatic support and accuracy will be determined by modules of individual deviations and by distribution laws of actual deviations within the tolerance range
When solving the problem of assembly optimization, all these provisions are not significant, as in the case of constructing its general solution, the choice of a specific distribution law of actual deviations within the tolerance range is not so fundamental that one does not try to look for such a solution that would hold various initial arguments
We believe that all considered errors in the relative position of base surfaces of the parts of crank-connecting rod mechanisms are the essence of values, independent and random in nature, conditionally distributed within the tolerance range according to patterns, analytically described by the following dependencies: a) the error in the relative position of cylinder liner and crankshaft axes according to

Summary

Introduction

The release probability from the assembly site of high-quality products with automatic support and accuracy will be determined by modules of individual deviations and by distribution laws of actual deviations within the tolerance range. When solving the problem of assembly optimization, all these provisions are not significant, as in the case of constructing its general solution, the choice of a specific distribution law of actual deviations within the tolerance range is not so fundamental that one does not try to look for such a solution that would hold various initial arguments. In this case, any analogies in the distribution patterns will transform the general solution into particular variants with obvious simplifications of computational operations. ⎯ assessment of expansion possibilities and boundaries of considered maximum deviations without noticeable deterioration in the quality indicators of assembled mechanisms

Materials and Methods

Results and Discussion

Conclusions