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Research on automatic generation method for assembly dimension chain based on body

An automatic technology of assembly size and chain, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problems that the product assembly model information description is difficult to transmit and share in the computer, and affect the accuracy of the size chain, etc., to achieve Strong applicability and guaranteed compatibility

Inactive Publication Date: 2019-10-01
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

However, in the current research on dimensional chains, there is a problem that the information description in the product assembly model is difficult to transmit and share in the computer, which affects the accuracy of dimensional chain generation

Method used

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  • Research on automatic generation method for assembly dimension chain based on body
  • Research on automatic generation method for assembly dimension chain based on body
  • Research on automatic generation method for assembly dimension chain based on body

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Embodiment Construction

[0013] Combined with the accompanying drawings below, as attached figure 1 As shown, the design dimension of the part is: L1= mm, L2= mm, L3= mm, L4= mm, L5= mm, L6= mm, L7= mm, L8= mm. The technical solution of the present invention is further described in detail through specific examples.

[0014] Step A: Construct the information representation model of the assembly dimension chain. According to the structure of the assembly, its 3D assembly model is disassembled, the assembly constraint relationship between each part is extracted by LTG algorithm, and the assembly feature surface of each part is extracted by AME algorithm. According to the extracted relevant tolerance information between parts, including assembly constraint relationship, assembly feature surface, tolerance geometric elements, etc., the basic structure of assembly dimension chain representation model is formed, such as figure 2 As shown, the model consists of four layers, which are part l...

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Abstract

The invention discloses an automatic assembly dimension chain generation method based on a body. In order to solve the problem that information description in a product assembly model is difficult totransmit and share in a computer, the invention utilizes the advantage that the ontology can realize real semantic sharing and rule description to construct an assembly model and a corresponding judgment rule, so that an ontology reasoning knowledge framework is constructed through a JESS reasoning engine. According to the method, in combination with a semantic network rule language rule base, anassembly model information unit which faces size information and is completely expressed by assembly constraint information is constructed by utilizing an ontology, a shortest assembly size chain is automatically searched out, and a closed loop, upper deviation and lower deviation are reasoned out by utilizing a rule language. The computer can automatically generate the reasonable size chain according to the assembly body, and a method is provided for intelligent generation of the assembly size chain.

Description

technical field [0001] The invention belongs to the technical field of computer-aided tolerance design (CAT), and in particular relates to an automatic generation method of an assembly dimension chain based on ontology rule description. Background technique [0002] The automatic generation of assembly dimension chain refers to the use of computer to automatically establish the functional function equation between the closed loop and the component loop on the basis of the computer expressing the dimension and tolerance information. The assembly dimension chain mainly reflects the product assembly constraint relationship formed by each component of the product. The establishment of the assembly information model is the basis for the generation of the assembly dimension chain. The problems to be solved by the automatic generation of the dimension chain include the determination of the closed loop, the search of the component loop, Judgment of increase and decrease of compositi...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 江艳燕黄美发刘智勇
Owner GUILIN UNIV OF ELECTRONIC TECH
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