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Tolerance Design of Path Generating Four Bar Mechanism


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DOI: https://doi.org/10.15866/ireme.v13i12.18328

Abstract


Mechanisms are used for different path generation tasks, where a point on the coupler traces the required path. The link dimensions of a mechanism are determined using deterministic synthesis, where, the dimensional tolerances and the joint clearances are not considered. The performance of such mechanisms deviates due to internal and external uncertainties. It is necessary to allocate optimum tolerances and clearances to these mechanisms. Tolerance design is a technique to allocate optimum tolerances to such mechanisms. In this paper, two approaches of tolerance design have been discussed, common tolerance level approach and combined tolerance level approach. The first one has been iterative, where tolerance design begins with maximum tolerance allocation to all control factors. The tolerances of most influencing control factors have been tightened iteratively in order to improve robustness. Combined tolerance level approach has been direct, where the tolerance design has been done by analyzing all control factors at all tolerance levels simultaneously. A vertical line has been specified as the path generation task. The design parameter values have been synthesized deterministically. Both the approaches have been applied for tolerance design of the best deterministically synthesized mechanism. It has been observed that both the approaches have resulted in distinct tolerance allocation and robustness.
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Keywords


Four Bar Mechanism Synthesis; Link Tolerance and Joint Clearance; Robust Design; Taguchi Method; Tolerance Design

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