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Method for estimating size distribution center of regular geometrical part

A technology of size distribution and geometric shape, applied in the field of parts size inspection, can solve the problems of difficult to ensure accuracy and low efficiency, and achieve the effect of saving inspection costs, improving efficiency and reducing the amount of inspection samples

Pending Publication Date: 2020-06-02
XI'AN PETROLEUM UNIVERSITY
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  • Claims
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Problems solved by technology

[0005] In order to overcome the problems of low efficiency and difficult guarantee of accuracy in the estimation of the size distribution center of the existing sampling detection methods, the purpose of the present invention is to provide a method for estimating the size distribution center of parts with regular geometric shapes, which can accurately estimate The size distribution center of the whole batch of parts, the results can be directly used to estimate the size distribution center of regular geometric shape parts under the condition of constant systematic error

Method used

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  • Method for estimating size distribution center of regular geometrical part
  • Method for estimating size distribution center of regular geometrical part
  • Method for estimating size distribution center of regular geometrical part

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Embodiment Construction

[0026] Below in conjunction with the accompanying drawings, the present invention will be further described by taking an inlay of an injection molded part as an example.

[0027] In this embodiment, a Monte Carlo simulation method is used to generate a virtual sample of an inlay, and the present invention is used to sample an inlay and estimate the distribution center of the step size of the end face. figure 2 It is the part drawing of the inlay in this embodiment, and the design size of the end face step is 20±0.1mm. It is assumed that the end face step size of a certain batch of inlays obeys N(19.95,0.02 2 ), the total number of inlays in this batch is 1,000. In order to ensure the estimation accuracy, the estimation error shall not exceed 5% of the tolerance zone, that is, 0.01mm, and the method is used to estimate the size distribution center of the end face steps of the batch of inlaid pieces.

[0028] according to figure 1 The implementation steps of the technical sch...

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Abstract

The invention discloses a method for estimating the size distribution center of a regular geometrical part. The method comprises the following steps: step 1, part sampling; 2, calculating the mean value and the standard deviation of the sizes of the sample parts; 3, calculating the confidence interval of the size distribution center of the whole batch of parts; 4, estimating the size distributioncenter of the batch of parts by using the mean value of the sizes of the sample parts by adopting a sequential sampling method; the method comprises the following steps: calculating an estimated valueof a part size distribution center under a given confidence coefficient and an estimated error based on a small sample; according to the obtained sample information, whether sampling should be continued or not is flexibly judged, sampling termination conditions are determined based on estimation error constraints, and on the basis of guaranteeing precision, the detection sample amount is greatlyreduced, the detection cost is saved, and the efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of part size inspection, in particular to a method for estimating the size distribution center of regular geometric parts, which is suitable for the size distribution center of the same batch of regular geometric parts under the manufacturing process conditions of constant value systematic error The estimation method mainly realizes the accurate estimation of the size distribution center of parts under the condition of small samples. Background technique [0002] Dimensional accuracy has a direct impact on the performance of parts such as assembly and interchangeability. To ensure accuracy, parts must undergo strict dimensional inspection before leaving the factory. Due to the joint influence of systematic error and random error in the manufacturing process, the overall dimensional deviation and dimensional fluctuation of the parts are unavoidable, resulting in the misalignment between the size distribution ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/10G01B21/00
CPCG06F17/10G01B21/00
Inventor 赵德中刘战锋于洋韩晓兰冯亚洲刘雁蜀
Owner XI'AN PETROLEUM UNIVERSITY
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