Actual-condition tolerance modeling method based on Jacobian spinors

A technology of actual working conditions and modeling methods, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as digital model differences

Inactive Publication Date: 2010-05-19
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although these models can express the engineering semantics of the tolerance, when analyzing the tolerance of the digital model of the product, the influence of the actual working environment of the product (such as: the product bears various loads in actual use) is ignored

Method used

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  • Actual-condition tolerance modeling method based on Jacobian spinors
  • Actual-condition tolerance modeling method based on Jacobian spinors
  • Actual-condition tolerance modeling method based on Jacobian spinors

Examples

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Embodiment 1

[0107] Embodiment 1: Take a certain gear pump as an example to carry out case analysis. Number of teeth z=10, modulus m=1.5, tooth width 16mm, rated pressure 25MPa, rated speed 1450r / min. The gear pump assembly consists of three parts: pump body P1 (see image 3 ), driving gear P2 (see Figure 4 ), driven gear P3 (see Figure 5 ), the assembly requirement that needs to be guaranteed and controlled among the three is the meshing gap between the two gears. A, B, C, D in the figure are reference codes, T i is the tolerance code, and the corresponding tolerance values ​​are shown in Table 3, D i with L i is the part size, and the corresponding size values ​​are shown in Table 4.

[0108] Tolerance code and corresponding tolerance value in the embodiment of table 3

[0109]

[0110] Dimension codes and corresponding dimension values ​​in the embodiment of Table 4

[0111]

[0112] The first step is to establish an assembly model under ideal conditions and calculate th...

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Abstract

The invention relates to an actual-condition tolerance modeling method based on Jacobian spinors, belonging to the technical field of mechanical tolerance digitization. By calculating the deformation of a working part during loading, changing to the correction quantity of Jacobian spinors and compensating and correcting a Jacobian spinor tolerance model in an ideal condition, the invention establishes an assembly tolerance mathematical model based on Jacobian spinors and actual conditions. The actual-condition tolerance modeling method is technically characterized by comprising the steps of: firstly establishing an assembly tolerance model in the ideal condition; then considering the influences of environmental factors in the actual conditions, and calculating the changes of the size, the shape and the position of a component caused by the influences; mathematically expressing the changes in a spinor matrix mode as compensation, and combining the compensation with the tolerance model in the ideal conditions; and finally obtaining the assembly tolerance model in the actual conditions accordingly. The invention has the advantages that calculation results can be used for judging the assembling properties in the actual conditions and verifying and checking the tolerance design results, thereby predicting and judging the changes of product performances under different assembling design tolerances.

Description

technical field [0001] The invention belongs to the technical field of digitalization of mechanical tolerances, and in particular relates to a method for modeling tolerances of actual working conditions based on Jacobian screw. Background technique [0002] Tolerance modeling refers to the accurate tolerance expression of a solid model or feature model in the computer, and a correct and reasonable interpretation of its semantics. Tolerance modeling needs to solve two problems: the description of the boundary of the tolerance domain and the description of the changing elements that meet the tolerance requirements, that is, to interpret the tolerance information according to the engineering semantics; the current tolerance mathematical modeling methods are: 1) drift model; 2) based on Mathematical model of tolerance function and vector equation; 3) Parameter vectorization mathematical model based on geometric constraint change; 4) Mathematical model based on drift and degree o...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 张为民李鹏忠李国伟陈灿
Owner TONGJI UNIV
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