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Symmetry error evaluation method based on minimum zone

A technology with minimum area and symmetry degree, applied in measurement devices, instruments, etc., can solve the problems of difficult to achieve calculation results, limited number of sampling points, poor calculation stability, etc.

Active Publication Date: 2013-09-11
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

Due to the shortcomings of these methods, such as poor calculation stability, low calculation efficiency, limited number of sampling points, and difficulty in achieving accurate solutions for calculation results, it is difficult to apply the minimum area method in actual detection.

Method used

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  • Symmetry error evaluation method based on minimum zone
  • Symmetry error evaluation method based on minimum zone
  • Symmetry error evaluation method based on minimum zone

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Embodiment Construction

[0039] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. The present invention is through as attached figure 1 The scheme shown is realized, and the specific steps are as follows:

[0040] Step 1: Place the part features to be detected on the measurement platform, measure and extract the measured features and the measuring points on the baseline in the measurement space Cartesian coordinate system; apply the minimum area method to fit the baseline, and obtain the baseline correspondence The direction vector of an ideal straight line , and a point on the ideal line .

[0041] Step 2: Carry out coordinate rotation transformation, so that with the coordinate system z axis parallel; after coordinate rotation transformation, set the measuring point of the measured feature at xoy The projection on the coordinate plane is , =1, 2,... n , n is the number of measuring points and n is a positive integer...

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Abstract

A symmetry error evaluation method based on a minimum zone is mainly used for evaluating symmetry errors with a line serving as a reference. The method comprises the steps of first measuring and obtaining measured characteristics and coordinates of measured points on a reference line; performing fitting of a reference straight line through a minimum zone method, enabling a direction vector of the reference line corresponding to ideal characteristics to be parallel to a z-axis by coordinate system transformation, enabling the measured characteristics to be projected in an xoy plane, dividing an evaluated zone into a plurality of zones, and calculating an optimal value of a measured characteristic parameter and a corresponding symmetry error value through a method of respectively calculating corresponding error values in the zones. According to the symmetry error evaluation method, a symmetry error meeting the minimum zone and the optimal value of the measured characteristic parameter can be worked out accurately.

Description

technical field [0001] The invention relates to a symmetry error evaluation method based on the smallest area, which belongs to the field of precision measurement and computer application, and can be used for the qualification detection of the symmetry degree based on the line in various situations in geometric products, and provides a basis for the processing and processing technology. provide guidance for improvement. Background technique [0002] Symmetry is one of the most common inspection items in mechanical geometric products, and it is also one of the important factors affecting the quality, performance and assembly of products. According to the provisions of the international standard ISO / 1101, the calculation of part error is based on the minimum area method as the arbitration method. Under the same hardware detection conditions, the detection accuracy of the detection equipment can be improved by applying the minimum area to calculate the part error. [0003] Th...

Claims

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Application Information

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IPC IPC(8): G01B21/24
Inventor 钟艳茹陈磊磊孙永厚黄美发范凯
Owner GUILIN UNIV OF ELECTRONIC TECH
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