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Space dimension chain tolerance analytical method based on graphic representation

A technology of spatial size and graphic representation, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as low precision calculation, inconvenient calculation, and lack of versatility

Inactive Publication Date: 2012-06-13
BEIJING INSTITUTE OF TECHNOLOGYGY
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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] To sum up, the use of surface-changing method, spatial angle conversion method, and vector matrix method in the tolerance analysis of spatial dimension chains is not very mature, and it is inconvenient to use in the tolerance analysis of spatial dimension chains, requiring human intervention in the calculation process, which is not universal. generality, and the calculation accuracy is not high, in addition, these three methods are not convenient to use the computer to realize the calculation of the closed loop of the general general size chain

Method used

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  • Space dimension chain tolerance analytical method based on graphic representation
  • Space dimension chain tolerance analytical method based on graphic representation
  • Space dimension chain tolerance analytical method based on graphic representation

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Embodiment Construction

[0098] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0099] figure 1 The specific steps of the tolerance analysis method based on the graphic representation of the dimension chain are as follows:

[0100] 1) Determine the composition of the closed loop of the dimensional chain according to the assembly or part design drawing.

[0101] 2) Determine the composition of the dimensional chain according to the relationship between the parts of the assembly or the structure of the parts of the assembly.

[0102] 3) Extract the size parameters of each size in turn according to the size chain type and set the size chain information.

[0103] figure 2 A graphical representation of dimensional information for a three-dimensional dimensional chain is shown. For the i-th dimension, if the dimension is projected on the XOY plane, the dimension parameters to be extracted include the basic length l i , length deviatio...

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Abstract

The invention discloses a space dimension chain tolerance analytical method based on graphic representation, which can achieve the purpose of computing generality and improving computing efficiency. The steps of the method is that constitution of a closed ring of a dimension chain is determined according to an assembly body or a part design drawing; constitution of the dimension chain is determined according to correlations between parts of the assembly body or structures of the parts of the assembly body; dimension parameters of each dimension are sequentially picked up according to dimension types, and dimension chain information is set; parameter sets of the closed ring is computed based on the set dimension chain information and using an arithmetic of a matrix laboratory (MATLAB) programme; and a maximum value (Max) and a minimum value (Min) of the dimension parameters are found out from the parameter sets of the closed ring, and a changing range [Min, Max] of the closed ring is obtained and output.

Description

technical field [0001] The invention relates to a dimension chain tolerance analysis method, which belongs to the field of mechanical precision design, in particular to a dimension chain tolerance analysis method based on graphic representation space. Background technique [0002] At present, the tolerance analysis methods of spatial dimension chains can be mainly divided into: surface changing method, spatial angle conversion method, and vector matrix method. [0003] 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. The calculation idea of ​​the surface-changing method is relatively simple, but for more complex spatial mechanisms, it is difficult to use the surface-changing method to establish dimensional chains and dimensional chain equations, and the calculation accuracy i...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 阎艳余美琼王国新林燕清
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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