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Optimum design method for assembly tolerance

A technology of assembly tolerance and optimal design, applied in computing, manufacturing computing systems, instruments, etc.

Active Publication Date: 2014-07-02
西安航天计量测试研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Many cost-tolerance models focus on the study of dimensional tolerances. However, manufacturing costs are also affected by shape tolerances and position tolerances. Only a model that takes the three into account is closer to the actual situation.

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Embodiment Construction

[0103] Below in conjunction with accompanying drawing, the above-mentioned and other technical features and advantages of the present invention are described in more detail.

[0104] The invention takes the minimum processing cost as the optimization goal, comprehensively considers the size tolerance and shape tolerance, and establishes a new cost-tolerance model. The total tooling cost of an assembly consists of the tooling costs of all attached parts, and the tooling cost of a part consists of the tooling costs of all its feature faces. Not every feature face participates in the assembly of the part. Since the present invention mainly considers the optimization design of assembly size tolerance and shape tolerance size, only the processing cost of the assembly feature surface is considered.

[0105] The process of the assembly tolerance optimization design method based on cost target optimization of the present invention is as follows:

[0106] Step a, according to the ass...

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Abstract

The invention relates to an optimum design method for assembly tolerance. The method includes the steps of determining the dimensional tolerance according to an assembly tolerance chain, determining the constraint condition of the assembly tolerance, determining the type and the range of form and location tolerance, determining the minimum machining cost of an assembly as an optimization target, and setting up a target function for optimizing the assembly tolerance, wherein the target function is calculated through the steps of setting a part expression function of the mechanical assembly, determining a total machining cost expression function of the mechanical assembly, determining a machining cost function of each part in the assembly, determining a machining cost function of assembly characteristics, obtaining a total machining cost-tolerance function of the assembly and obtaining the target function for optimizing the assembly tolerance. The optimization tolerance obtained by enabling the minimum machining cost to serve as the target and enabling machining capacity or machining cost or machining economic accuracy to serve as the constraint condition can meet the assembly function requirements of products, the constraint condition of machining is met, and good economic benefits can be obtained.

Description

technical field [0001] The invention relates to an optimal design method for mechanical assembly tolerances, in particular to an optimal design method for assembly tolerances. Background technique [0002] The assembly size tolerance and geometric tolerance of parts in the prior art are generally determined according to the product’s performance requirements, assembly function requirements, quality assurance, processing materials, production conditions, manufacturing costs, and corresponding national, industry, or enterprise standards. of. [0003] In the design stage, how to correctly and reasonably select the assembly tolerance value is a design problem that must be considered comprehensively. It is of great significance to ensure the assembly and performance of the product, improve product quality, and reduce manufacturing costs. Among the factors that affect the cost of machining a part, tolerances play a very important role. The smaller the design tolerance of the par...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06Q10/04G06Q50/04
CPCY02P90/30
Inventor 张毅谢永辉
Owner 西安航天计量测试研究所
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