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Method and device for obtaining profile tolerance error of helical surface

A technology of helical surface and profile, applied in the field of measurement, can solve the problems of high computational complexity, increase the helical surface, reduce the accuracy of the profile error, etc., and achieve the effect of simple and effective process, improved accuracy, and improved measurement accuracy and measurement efficiency.

Inactive Publication Date: 2013-06-19
BEIJING INFORMATION SCI & TECH UNIV
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Problems solved by technology

[0003] In the prior art, the contour error of the helical surface is obtained by nonlinear methods (such as quasi-Newton method, steepest descent method), but due to the high computational complexity of the nonlinear method, the acquisition of the contour error of the helical surface is increased. Complexity, in order to reduce the complexity of contour error acquisition, in the prior art, the contour error of the spiral surface is obtained by using the least square method. Since the least square method is a linear method, it greatly simplifies the process of obtaining the contour error of the spiral surface. process, thereby improving the efficiency of obtaining the contour error; however, the least square method approximates the coordinate values ​​of the measurement points on the spiral surface in the process of obtaining the contour error of the helical surface, thus reducing the error of the contour precision

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  • Method and device for obtaining profile tolerance error of helical surface
  • Method and device for obtaining profile tolerance error of helical surface
  • Method and device for obtaining profile tolerance error of helical surface

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Embodiment Construction

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0028] figure 1 It is a schematic diagram of a worm applicable to the embodiment of the present invention, such as figure 1 As shown, the worm 10 in the embodiment of the present invention has a plurality of helical teeth. On a plane perpendicular to the axis of the worm 10 (that is, the end surface), the helical teeth may be Archimedes spirals, which are arranged on a plane containing the axis. The tooth profile (that is, the end surface...

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Abstract

The invention relates to a method and a device for obtaining a profile tolerance error of a helical surface. The method includes the steps of obtaining a plurality of first three dimensional coordinate values in the first world coordinate system of a plurality of measuring points on a helical surface of a worm through a three coordinate measuring machine; obtaining a plurality of second dimensional coordinate values in the second world coordinate system of a plurality of measuring points through a coordinate transformation of the plurality of the first three dimensional coordinate values; reconstructing a helical surface according to the plurality of the second three dimensional coordinate values and then obtaining an ideal curved surface after the reconstruction; calculating a plurality of minimum distances from the plurality of the first three dimensional coordinate values to the ideal curved surface and searching from the minimum distances, so as to obtain the profile tolerance error of the helical surface. In the invention, a large number of approximate treatments to the three dimensional coordinate values of the measuring points on the helical surface in the prior art are avoided. Therefore, the precision of the profile tolerance error of the helical surface is improved. The method and the device in the invention make the process of solving the profile tolerance error of the helical surface simple and effective, and further improve the precision and efficiency of measuring the helical surface.

Description

Technical field [0001] The invention relates to the technical field of measurement, and in particular to a method and device for obtaining the contour error of a spiral curved surface. Background technique [0002] With the rapid development of the aviation, aerospace, shipbuilding, automobile and mold industries, the application of spiral surfaces has become more and more extensive, and the measurement accuracy and measurement efficiency requirements of spiral surfaces have become higher and higher; because the mathematical model of spiral surfaces is more complex Therefore, there are relatively few studies on the profile error of the spiral surface. [0003] In the prior art, the profile error of the spiral surface is obtained by nonlinear methods (for example: quasi-Newton method, steepest descent method), but due to the high computational complexity of the nonlinear method, the profile error of the spiral surface is increased. Complexity, in order to reduce the complexity of o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/20
Inventor 陈青山祝连庆董明利郭阳宽孟浩潘志康岳新震李松涛王泮义陈云芳
Owner BEIJING INFORMATION SCI & TECH UNIV
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