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Separation Method of Systematic Error and Random Error of Discontinuous Machining Surface

A technology for machining surfaces and systematic errors, applied in measurement devices, instruments, optical devices, etc., can solve the problem of inability to apply discontinuous surface error separation, and achieve the effect of high separation efficiency and accurate separation results

Inactive Publication Date: 2018-06-19
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem that existing methods cannot be applied to the separation of discontinuous surface errors, the present invention provides an efficient method for separating systematic errors and random errors of discontinuous processing surfaces

Method used

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  • Separation Method of Systematic Error and Random Error of Discontinuous Machining Surface
  • Separation Method of Systematic Error and Random Error of Discontinuous Machining Surface
  • Separation Method of Systematic Error and Random Error of Discontinuous Machining Surface

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Embodiment 1

[0039] The method for separating the systematic error and random error of the discontinuous machining surface, the specific steps are as follows:

[0040] Step 1. Preliminary separation method of non-continuous machining surface errors

[0041] 1-1 Acquisition of small triangle faces

[0042] Firstly, the data of the discontinuous machining surface topography error E must be obtained by measurement, such as figure 1 shown. Use the Delaunay triangulation algorithm to operate the measured data of the surface topography to obtain multiple small triangular patches, such as figure 2 shown. The three vertices V corresponding to each small triangle face 1 ,V 2 ,V 3 , three vertices V 1 ,V 2 ,V 3 There are three-dimensional coordinates: V 1 =(V x1, V y1, V z1 ), V 2 =(V x2, V y2, V z2 ), V 3 =(V x3, V y3, V z3 ).

[0043] 1-2 Grid division

[0044] Mesh the machined surface, figure 1 , figure 2 The dotted lines in represent grids. Now divide the surface int...

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Abstract

The invention relates to a non-continuous machining surface system error and random error separation method and belongs to the mechanical machining field. The objective of the invention is to solve the incapability of an existing method to be applied to non-continuous surface error separation. The method includes two steps, namely preliminary separation of system error and random error and precise separation of the system error and the random error. According to the method, the system error is obtained from non-continuous machining surface profile error through gridding and interpolation fitting, and differencing is performed on the surface profile error and the system error, so that the random error can be obtained, and a preliminary separation result can be obtained; and the number of grids is increased continuously, so that the separation result of the system error and the random error is considered as a precise separation result when the information entropy of the system error is stable. The method of the invention is suitable for error separation of non-continuous machining surfaces with holes and slots. The method has the advantages of high error separation efficiency and accurate separation result.

Description

technical field [0001] The invention relates to a method for separating systematic errors and random errors of discontinuously processed surfaces, belonging to the field of mechanical processing. Background technique [0002] Parts will inevitably introduce machining errors during the machining process, which will have a certain degree of influence on the machining accuracy of the parts. The errors introduced by the machining process include two types: systematic errors and random errors. Systematic errors are formed by specific mode error sources in the machining process, such as thermal errors, positioning and clamping errors, etc.; random errors are formed by irregular noises inside and outside the process system. [0003] In order to improve the machining accuracy of the parts, it is necessary to offset the introduced machining errors by means of error compensation, and to realize the error compensation needs to determine the rules of the errors to be compensated in adv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/24
CPCG01B11/2433
Inventor 张发平杨吉彬吴迪张凌雲张体广张田会阎艳
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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