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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

Active Publication Date: 2019-11-15
WUHAN UNIV OF TECH
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Problems solved by technology

Traditional tolerance analysis and design are mainly based on two-dimensional dimension chains, and it is difficult to effectively express the coupling relationship between 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.

Method used

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  • Assembly error analysis and tolerance optimization method for parallel lifting mechanism
  • Assembly error analysis and tolerance optimization method for parallel lifting mechanism

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Embodiment Construction

[0020] Attached below Figure 1-2 The present invention is further described in detail, but the present invention is not limited.

[0021] The invention comprises the following steps: S1: step of drawing an assembly directed graph; S2: step of establishing an assembly feature tolerance model; S3: step of establishing an assembly error model of a parallel mating surface; S4: establishing a mechanism assembly error model step; S5: solving for reliable assembly accuracy degree step; S6: the step of establishing tolerance optimization model; S7: the step of constructing fitness function; S8: the step of solving the optimization model by genetic algorithm.

[0022] Analysis and optimization process of the present invention are:

[0023] S1: Analyze the assembly form of the mechanism, determine the assembly priority of each part, and draw the assembly directed graph to reflect the assembly information of the mechanism.

[0024] S2: For each part assembly feature, establish a part ...

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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.

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 ...

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Application Information

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IPC IPC(8): G06F17/50G06N3/12
CPCG06N3/126Y02P90/30
Inventor 胡剑方孟堃李林蔚李刚炎
Owner WUHAN UNIV OF TECH
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