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A Tolerance Analysis Method for Spatial Dimension Chains

A technology of spatial dimensions and analysis methods, applied in special data processing applications, instruments, electrical and digital data processing, etc., and can solve problems such as low calculation accuracy, difficulty in solving, and inappropriate use

Active Publication Date: 2018-05-01
COSCO SHIPPING SHIPYARD (NANGTONG) CO LTD +1
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Problems solved by technology

However, this method is difficult to solve for nonlinear dimensional chains with unknown angles in the dimensional chain, and the calculation accuracy is not high, so it is not suitable for use
[0006] In summary, the use of surface-changing method, space-angle conversion method, and vector matrix method in the tolerance analysis of spatial dimension chains is not very mature, and the elastic deformation of heavy products is ignored, which directly affects the final result and is not universal. Versatility, and the calculation accuracy is not high
In addition, these three methods are not convenient to use a computer alone to realize the calculation of the closed loop of the general general size chain

Method used

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  • A Tolerance Analysis Method for Spatial Dimension Chains
  • A Tolerance Analysis Method for Spatial Dimension Chains
  • A Tolerance Analysis Method for Spatial Dimension Chains

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Embodiment Construction

[0077] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0078] A spatial dimension chain tolerance analysis method that supports heavy-weight and large-size assemblies, which considers the self-weight and elasticity of heavy-weight and large-size assemblies, and specifically includes the following steps:

[0079] (1) Determine the basic parts and matching parts according to the assembly or part drawing; the determination of the basic parts is the determination of large-size and heavy-weight parts, mainly based on the automatic retrieval of the product BOM table. There are three retrieval rules: 1. The part with the largest weight; ②The part with the largest geometric size; ③The part with the smallest ratio of assembly accuracy to size value. A...

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Abstract

The invention provides a tolerance analysis method for a space dimension chain. The method supports large-weight and large-size assembling. The method takes the self-weight and elasticity of a large-weight and large-size assembling body into account, utilizes matrix and three-dimension modeling and finite element analysis to construct a three-dimension space dimension chain, and fully takes the space change of the dimensions and dynamic compensation of assembling accuracy into account. The method utilizes the six degrees of freedom principle of space to construct the matrix and conducts optimized classification and balancing calculation on the space dimension chain, so the size and tolerance design of large-weight and large-size engineering equipment tends to be reasonable, the machining and installing difficulty is reduced, and manual costs are saved.

Description

technical field [0001] The invention relates to a dimensional chain tolerance analysis method, belonging to the field of mechanical precision design, in particular to a space dimensional chain tolerance analysis method for supporting large-weight and large-size assemblies. Background technique [0002] At present, the tolerance analysis methods of spatial dimension chain can be mainly divided into: face changing method, spatial angle changing method and vector matrix method. The face-changing method is a calculation method that converts the spatial (three-dimensional) dimension chain into a plane (two-dimensional) dimension chain, and then converts the plane dimension chain into a linear (one-dimensional) dimension chain. [0003] The calculation idea of ​​the face-changing method is relatively simple, but it is difficult to use the face-changing method to establish the dimension chain and the equation of the dimension chain for a more complex space mechanism. [0004] The ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
Inventor 徐秀龙周金宇顾翔魏军王思铭石磊雷卫宁
Owner COSCO SHIPPING SHIPYARD (NANGTONG) CO LTD
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