Method and device for generating assembly dimensional chain

A technology of assembly size and size, applied in the mechanical field, can solve the problems of incomplete description, reduce the efficiency and success rate of the assembly size chain, and achieve the effect of improving accuracy

Active Publication Date: 2016-12-07
BEIJING INSTITUTE OF TECHNOLOGYGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problem of reducing the efficiency and success rate of automatic generation of assembly dimension chains caused by the incomplete description of dimension and tolerance information and assembly constraint information existing in the prior art, the present invention provides a method and device for generating assembly dimension chains

Method used

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  • Method and device for generating assembly dimensional chain
  • Method and device for generating assembly dimensional chain
  • Method and device for generating assembly dimensional chain

Examples

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no. 1 example

[0052] Such as figure 1 As shown, it is a flow chart of the steps of the method generated by the assembly dimension chain in the first embodiment of the present invention, including:

[0053] Step 101 , acquiring dimension and tolerance information and assembly constraint information of a pre-built 3D assembly model.

[0054] In this step, specifically, since the 3D assembly model is composed of sub-assemblies and parts, after obtaining a pre-built 3D assembly model, the 3D assembly model can be Decompose, decompose the 3D assembly model into sub-assemblies and parts, and then decompose the sub-assemblies step by step until all the parts included in the 3D assembly model are obtained, so as to obtain the dimensions and dimensions of all parts in the 3D assembly model Tolerance information and assembly constraint information.

[0055] Step 102, according to the size and tolerance information, obtain the size and tolerance information table.

[0056] In this step, the size an...

no. 2 example

[0071] Optionally, in order to ensure the integrity of the obtained assembly relationship transfer diagram and the success rate of assembly dimension chain generation, it is first necessary to ensure the integrity of the obtained 3D assembly model size and tolerance information and assembly constraint information. Therefore, after obtaining the size and tolerance information and assembly constraint information of the pre-built 3D assembly model, when the size and tolerance information and assembly constraint information are missing in the 3D assembly model, the missing size and assembly constraint information of the 3D assembly model can be Tolerance information and assembly constraint information are supplemented and complete.

[0072] For example, if figure 2 Shown is a schematic diagram of part mirror feature replication. When building a 3D assembly model, methods such as mirroring and arraying may be used to replicate geometric features. When copying geometric features,...

no. 3 example

[0079] Such as Figure 4 As shown, in the third embodiment of the present invention, according to the size and tolerance information table and the assembly constraint information table, the flow chart of obtaining the assembly relationship transfer diagram of the three-dimensional assembly model includes:

[0080] Step 401, obtain all dimension and tolerance information tables corresponding to each part in the three-dimensional assembly model.

[0081] In this step, specifically, each size and tolerance data can determine a size and tolerance information table. Here, all the size and tolerance information tables corresponding to each part in the three-dimensional assembly model are obtained, that is, each size and the dimension and tolerance information table where the tolerance data resides.

[0082] Step 402 , according to the association relationship among the first associated geometric features in all the dimensions and tolerance information table corresponding to each pa...

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Abstract

The invention provides a method and device for generating an assembly dimensional chain. The method comprises the steps that dimension and tolerance information and assembly constraint information of a pre-constructed three-dimensional assembly model are acquired; a dimension and tolerance information list is acquired according to the dimension and tolerance information, and the dimension and tolerance information list comprises a dimension and tolerance type with a first incidence relation, dimension and tolerance data and information of two first correlation geometrical characteristics corresponding to the dimension and tolerance data; according to the assembly constraint information, an assembly constraint information list is acquired, the assembly constraint information list comprises an assembly constraint type with a second incidence relation, assembly constraint data and information of two second correlation geometrical characteristics corresponding to the assembly constraint data; an assembly relation transitive graph is obtained according to the dimension and tolerance information list and the assembly constraint information list; the assembly dimensional chain of the three-dimensional assembly model is generated according to the assembly relation transitive graph. The generating efficiency of the assembly dimensional chain is improved, and the success rate of the assembly dimensional chain is increased.

Description

technical field [0001] The invention relates to the mechanical field, in particular to a method and device for generating assembly dimension chains. Background technique [0002] As one of the important foundations of Computer Aided Tolerancing (CAT), automatic generation of dimensional chains has always been a research hotspot in CAT. The automatic generation of the assembly dimension chain is to use the computer to automatically establish the functional equation between the closed loop and the component loop on the basis of expressing the dimension and tolerance information by the computer. [0003] At present, relevant domestic and foreign research institutes have done extensive research on the automatic generation of assembly dimension chains. The research content includes the following aspects: First, use mathematical equations to describe the geometric shape of the parts, and then use the computer to determine the size of the parts and carry out tolerance design. Sec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17
Inventor 刘检华丁晓宇鲍强伟曲强应小昆刘少丽张志强
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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