Assembly error analysis and tolerance optimization method for parallel lifting mechanism

A technology of assembly error and lifting mechanism, which is applied in the field of mechanism assembly accuracy, assembly error analysis and tolerance optimization of parallel lifting mechanism, and can solve the problem of coupling of assembly errors of parts without taking into account, and it is difficult to effectively express the tolerance coupling relationship between end parts pose requirements and other issues to achieve intuitive and accurate analysis results
CN110457783AActive Publication Date: 2019-11-15WUHAN UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN ยท China
Current Assignee / Owner
WUHAN UNIV OF TECH
Publication Date
2019-11-15

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Abstract

The invention discloses an assembly error analysis and tolerance optimization method for a parallel lifting mechanism. The assembly error analysis and tolerance optimization method is characterized byestablishing a part assembly characteristic tolerance model and an assembly error transfer model based on the three-dimensional tolerance model; and establishing a part assembly characteristic tolerance optimization model by taking the minimum machining cost as a target and taking the assembly precision reliability, the parallel matching surface assemblability and the machining capacity as constraint conditions according to the known assembly precision requirement of a certain key size in a mechanism, constructing a fitness function, and solving the part assembly characteristic tolerance optimization model by adopting a genetic algorithm. Based on three-dimensional tolerance model analysis, a tolerance coupling relationship which cannot be expressed by a two-dimensional dimension chain can be introduced into an assembly error transfer model of the mechanism, so that an analysis result of an assembly error is more intuitive and accurate.
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Description

technical field

[0001] The invention belongs to the technical field of mechanical assembly, and relates to mechanism assembly accuracy, in particular to an assembly error analysis and tolerance optimization method of a parallel lifting mechanism. Background technique

[0002] Product assembly refers to the process from parts to complete products. This process is also a process in which the machining errors of parts assembly features are continuously accumulated to form assembly errors. In order to improve the structural stability of the mechanism, there will be a parallel fit between the parts. The traditional tolerance analysis and design is mainly based on the two-dimensional dimension chain, it is difficult to effectively express the coupling relationship between the tolerances and the pose requirements of the end parts when the mechanism is assembled, and the assembly error coupling problem when the parts are connected in parallel is not considered. . Therefore, it is ...

Claims

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