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An assembly tolerance optimization design method based on cost objective optimization

A technique for assembly tolerance, target optimization, applied in computing, special data processing applications, instrumentation, etc.

Inactive Publication Date: 2016-08-24
XIJING UNIV
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  • Abstract
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  • 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.

Method used

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  • An assembly tolerance optimization design method based on cost objective optimization
  • An assembly tolerance optimization design method based on cost objective optimization
  • An assembly tolerance optimization design method based on cost objective optimization

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Embodiment Construction

[0071] The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.

[0072] 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.

[0073] see figure 1 As shown, it is a flow chart of the assembly tolerance optimization design method based on cost target optimization of the present invention.

[0074] The process i...

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Abstract

The invention relates to an assembly tolerance optimum design method based on cost objective optimization. According to the method, the minimum machining cost of an assembly body is determined as an optimization target, and an objective function of assembly tolerance optimum is established; the function is obtained through the following steps that a part representative function of a mechanical assembly body is set; a total machining cost representative function of the mechanical assembly body is determined; a machining cost function of each part in the assembly body is determined; a machining cost function of assembly features is determined; a total machining cost-tolerance function of the assembly body is obtained; the objective function of assembly tolerance optimum is obtained. According to the assembly tolerance optimum design method, the optimum tolerance is obtained with the minimum machining cost as the target and with the machining capacity, the machining cost or the machining economic accuracy as constraint conditions respectively, so requirements of products for assembly functions can be met, the constraint conditions of machining can be met, and good economic benefits can be obtained.

Description

technical field [0001] The invention relates to an optimization design method of mechanical assembly tolerance, in particular to an assembly tolerance optimization design method based on cost target optimization. Background technique [0002] Assembly dimensional tolerances and geometric tolerances of components in the prior art are generally based on product performance requirements, functional assembly requirements, quality assurance, processing materials, production conditions, manufacturing costs, and corresponding national, industry, or enterprise standards. [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 desi...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 张毅郭银赛
Owner XIJING UNIV
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