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Method for reasoning assembly tolerance standard and tolerance zone type of complex assembly body

A technology of assembly tolerance and reasoning method, which is used in electrical digital data processing, special data processing applications, instruments, etc., to achieve the effect of easy programming and strong applicability

Inactive Publication Date: 2011-03-02
XI AN JIAOTONG UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] The present invention mainly solves the design problems of complex assembly tolerance specifications and tolerance zone types, and aims to provide an effective solution for computer-aided tolerance design (CAT)

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  • Method for reasoning assembly tolerance standard and tolerance zone type of complex assembly body
  • Method for reasoning assembly tolerance standard and tolerance zone type of complex assembly body
  • Method for reasoning assembly tolerance standard and tolerance zone type of complex assembly body

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Embodiment Construction

[0033] combine Figure 1-8 The present invention will be further described in detail according to the embodiments given by the inventor according to the technical method of the present invention.

[0034] Next, take a certain gear reducer as an example to illustrate the whole reasoning process. In order to reduce the complexity of the problem, only the transmission structure between the two transmission shafts of the gear reducer is taken as the research object, and the assembly of the reducer end cover, shaft key, felt sealing ring and their assembly tolerances are not considered. Rolling bearings are standard parts, so there is no reasoning that takes into account the tolerances of the internal assembly of the bearing itself. However, rolling bearings are indispensable for constructing various reasoning relationship matrices between parts, so the bearing must be studied as a whole.

[0035] Step 1: Build a product assembly model. According to the functional requirements o...

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Abstract

The invention discloses a method for the reasoning assembly tolerance standard and tolerance zone type of a complex assembly body. The method comprises the following steps: (1) constructing a three-dimensional assembling model of a product; (2) splitting the assembling model; (3) establishing an assembly relation matrix between the components; (4) extracting assembly characteristic faces, and establishing a constraint relation matrix between the assembly characteristic faces; (5) reasoning the assembly constraint type; (6) reasoning the assembly tolerance types; (7) reasoning datum reference frames of the assembly characteristic faces; and (8) reasoning the set function of the tolerance zone, and determining the type of the tolerance zone. In the invention, a polychromatic set reasoning relation matrix is adopted to describe the whole reasoning process and is easily programmed, therefore, the method can be rapidly realized in a computer. The invention is established on the basis of the relation and constrain between the concrete assembly characteristic faces, can realize the practical design of the assembly tolerance, satisfies the requirements of Top-down design technique, conforms to the logical thinking habits of the designers, and has very strong applicability.

Description

Technical field: [0001] The invention belongs to the field of computer-aided tolerance design (CAT), and in particular relates to a complex assembly tolerance specification based on polychromatic set theory and a reasoning method for tolerance zone types thereof. Background technique: [0002] The design and manufacture of most products inevitably involves the assembly of parts or components. Assembly tolerance not only directly determines the assemblability and assembly quality of the product, but also greatly affects the manufacturing cost and service life of the product. Therefore, in the development stage of new products, it is very important to design reasonable assembly tolerance specifications. At present, 3D computer-aided design technology has been widely used in the design stage of product life cycle. In most CAD modeling systems, their core is a solid modeler, and the designer can establish a 3D assembly model of the product based on the ideal size and human-com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
Inventor 李宗斌张毅
Owner XI AN JIAOTONG UNIV
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