Dimension chain tolerance distribution method based on orthogonal test principle

A technology of orthogonal test and distribution method, which is applied in electrical digital data processing, special data processing applications, instruments, etc., and can solve problems such as unsatisfactory distribution results and less research on nonlinear dimension chains.

Inactive Publication Date: 2012-08-01
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

[0004] To sum up, methods such as the equal tolerance method, equal precision method, coordination method, equal proportion influence method, and equal process capability method need to be allocated based on human experience, and the allocation results are not ideal
The tolerance optimization method mainly takes the processing cost as the optimization goal, and allocates tolerances for the linear dimensional chain, and the research on the nonlinear dimensional chain with the goal of assembly success rate is relatively small.

Method used

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  • Dimension chain tolerance distribution method based on orthogonal test principle
  • Dimension chain tolerance distribution method based on orthogonal test principle
  • Dimension chain tolerance distribution method based on orthogonal test principle

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Embodiment Construction

[0120] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0121] figure 1 It is a dimensional chain tolerance allocation method based on the principle of orthogonal test, and the specific steps are as follows:

[0122] 1), according to the assembly or part design drawing to obtain the dimension chain composition ring l i The basic information of , the basic value of the closed loop y and the expression of the closed loop y. Composition ring l i The basic information includes the number n of rings and the basic value x of rings i , i=1,...,n; the basic value of the closed loop y includes the maximum limit value y u and the minimum limit value y d .

[0123] According to the assembly or part design drawing, the expression of the closed loop y can be obtained as:

[0124] y=f(l 1 , l 2 , L, l n ) (1)

[0125] 2), according to the number n of rings, select the corresponding orthogonal table L m...

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Abstract

The invention discloses a dimension chain tolerance distribution method based on the orthogonal test principle, which achieves the aim of improving distribution accuracy. The method includes the following steps: obtaining basic information of dimension chain composition rings, basic value of closed rings and an expression of the closed rings according to an assembly body or a part design picture,selecting a corresponding orthogonal table according the number of the composition ring, solving flexibility of each composition ring according to the expression of the closed rings, constructing a composition ring deviation collection LU corresponding to the largest limit value condition of the closed rings and a composition ring deviation collection LD corresponding to the smallest limit value condition of the closed rings, respectively optimizing and distributing the composition ring deviation collections LU and LD and outputting results.

Description

technical field [0001] The invention relates to a dimension chain tolerance design method, which belongs to the field of mechanical precision design, in particular to a dimension chain tolerance allocation method based on the principle of orthogonal test. Background technique [0002] At present, the dimensional chain tolerance allocation methods can be divided into: equal tolerance method, equal precision method, coordination method, equal proportion influence method, equal process capability method and tolerance optimization allocation method, etc. [0003] The equal tolerance method is to assume that each part is processed according to the same tolerance level, and the average tolerance is obtained from the closed-loop tolerance, and then adjusted according to the difficulty of processing each part based on experience. The equal precision method is to assume that each part is processed according to the same precision level, and first calculate the average precision, then ...

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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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