Method for assessing composite space type face geometric error

A geometric error and composite space technology, applied in the direction of measuring devices, instruments, etc., can solve problems such as complex implementation process, excessive number of iterations, wrongly discarded qualified products, etc.

A geometric error and composite space technology, applied in the direction of measuring devices, instruments, etc., can solve problems such as complex implementation process, excessive number of iterations, wrongly discarded qualified products, etc.

CN101413793AInactive Publication Date: 2009-04-22TIANJIN UNIV
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  • Method for assessing composite space type face geometric error
  • Method for assessing composite space type face geometric error
  • Method for assessing composite space type face geometric error

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Embodiment Construction

[0071] The invention strictly defines the geometric tolerance semantics of the compound space surface, and proposes a geometric approximation principle and algorithm for evaluating the error of the compound space surface. For a single surface, a complete approximation process is constructed and the algorithm is modeled; for a group of surfaces, the principle and method of overlapping inclusion evaluation are studied, the overlapping processing process is constructed, and an algorithm model is constructed. According to the user's error evaluation items, it is divided into single surface and group surface, and the error evaluation is carried out according to the corresponding algorithm. Finally, the product geometric data is compared with the error evaluation results, and the form of color point cloud and error evaluation report is given to the user. Output processing error information. specifically is:

[0072] (1) Establish the tolerance semantics and error evaluation mathema...

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Abstract

The invention relates to a method for evaluating geometrical error of a compound spatial moulding surface, belonging to the field of mechanic parts geometrical error evaluation. The method comprises the following steps: (1) a three-dimensional CAD model of a work piece to be evaluated is read and an ideal work piece model is reconstructed; (2) geometrical data of the work piece to be evaluated is measured to obtain the coordinate information of each measured point; (3) the error value of the measured moulding surface is calculated according to the geometrical error evaluation items of the work piece to be measured including spatial straightness accuracy, cylindricity and punch combination compound position; and (4) the error evaluation result is compared with the read ideal work piece model for analyzing, the processing error information is displayed by adopting colour cloud points, and the error evaluation report is obtained finally. The invention, by the approaching process for constructing minimum zone, realizes fast and accurate evaluation on the geometrical error of the compound spatial moulding surface.

Description

technical field [0001] The invention belongs to the field of geometric error evaluation of mechanical parts, and relates to a geometric error evaluation method. Background technique [0002] The error models and geometric error evaluation algorithms used in the existing geometric error evaluation systems are mostly approximate algorithms, the implementation process is complex, and there are problems of too many iterations or excessive calculations to varying degrees. The definition does not match, and the shape error value is often overestimated, resulting in the false rejection of qualified products. Or it is only limited to giving the normal deviation value of a certain number of discrete points on the space profile, but fails to give the geometric error information of the overall profile. After measuring the workpiece with advanced measurement technology and instruments, advanced shape and position error evaluation theory and precise algorithm are the key to obtain the a...

Claims

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Application Information

Patent Timeline
22 Apr 2009
Publication
CN101413793A
IPC
G01B21/00; G01B21/20
Inventors
何改云; ιƒ‘ζƒ ζ±Ÿ