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Automatic generation method for assembly tolerance synthesis of complex assembly body

An assembly tolerance and automatic generation technology, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems of poor tolerance information transmission, tolerance synthesis cannot be automatically generated, etc., and achieve the effect of strong applicability

Inactive Publication Date: 2015-11-11
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

[0003] Aiming at the two problems of "tolerance synthesis cannot be automatically generated in the product design process" and "tolerance information cannot be transmitted smoothly between heterogeneous CAX systems", this invention draws on the latest research results in the field of artificial intelligence to provide a complex assembly assembly tolerance Comprehensive automatic generation method

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  • Automatic generation method for assembly tolerance synthesis of complex assembly body
  • Automatic generation method for assembly tolerance synthesis of complex assembly body
  • Automatic generation method for assembly tolerance synthesis of complex assembly body

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Embodiment Construction

[0026] The implementation process of the method will be described below by taking a split gearbox as an example. The component is composed of a case body, a case cover, a gear shaft and a bushing, and the relevant dimension information is marked in the figure. After assembly, there is a certain gap between the shaft shoulder and the end face of the left bushing, which is A 0 , the basic dimensions and tolerances of each part are known (unit: mm), and the assembly tolerance comprehensive automatic generation process is shown in figure 1 .

[0027] Step 1: Build a 3D assembly model of the product. According to the functional requirements of the product and the ideal size of each part, a three-dimensional assembly model of the split gearbox is constructed in SolidWorks, and its partial view is shown in figure 2 .

[0028] Step 2: Disassemble the 3D assembly model of the product. According to the structure of the split gearbox, its three-dimensional assembly model is disasse...

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Abstract

The invention discloses an automatic generation method for assembly tolerance synthesis of a complex assembly body. The method comprises the following steps of: (1) constructing a three-dimensional assembly model of a product; (2) disassembling the three-dimensional model; (3) extracting assembly restriction relations among parts; (4) extracting assembly characteristic surfaces of the parts; (5) constructing an assembly tolerance synthesis body class and attributes; (6) constructing an assertion axiom set for representing the assembly restriction relations among the parts; (7) constructing an assertion axiom set for representing assembly restriction relations among the characteristic surfaces; (8) constructing an assertion axiom set for representing space relations among geometric elements of the assembly characteristic surfaces; (9) determining an assembly tolerance type and an assembly tolerance value of each part by inference; (10) performing optimal distribution on the tolerance values; and (11) performing assemblability evaluation. The method adopts a network body language and a semantic web rule language for describing the whole inference process, and has the advantages of simplicity, high efficiency, intelligence and the like.

Description

technical field [0001] The invention belongs to the field of computer-aided tolerance design (CAT), and in particular relates to a comprehensive and automatic generation method of assembly tolerances of complex assemblies. Background technique [0002] Tolerance synthesis refers to the process of tolerance allocation that takes the product's assemblability and manufacturability as constraints and minimizes the total cost under the condition of meeting the functional requirements of product assembly. In the current design process of geometric products, the comprehensive tolerance information is basically manually specified by the designer in the CAD system. Due to the differences in designers' own experience, different designers may specify different assembly tolerance types and tolerance values ​​for the same geometric product, which will cause uncertainty in the product design process. In order to reduce this uncertainty and solve the problem of poor transmission of tolera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 钟艳如卢宏成刘夫云黄美发许本胜曾聪文梁毅芳申松坡
Owner GUILIN UNIV OF ELECTRONIC TECH
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