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Computing method of function sizes of benchmark constrained cylinder

A cylinder and datum technology, applied in the direction of mechanical devices, mechanical diameter measurement, instruments, etc., can solve problems such as difficult production applications, low calculation efficiency, and limited number of sampling points

Active Publication Date: 2013-09-11
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are difficult to be put into production due to the defects of poor calculation stability, low calculation efficiency, limited number of sampling points, and difficulty in achieving accurate solutions for calculation results.

Method used

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  • Computing method of function sizes of benchmark constrained cylinder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A calculation method for the effective size of a cylinder with datum constraints, when used to calculate the minimum circumscribed size of the cylinder, includes the following steps, as shown in the attached figure 1 Shown:

[0060] Step 1: Place the measured part on the measuring platform, and obtain the measuring point coordinates of the datum feature and the measured cylinder in the rectangular coordinate system of the measuring space.

[0061] Step 2: Determine whether the datum feature is a plane or a straight line;

[0062] If the datum feature is a plane, apply the minimum area method to fit the datum plane to obtain the normal vector of the datum plane; if the datum feature is a straight line, apply the minimum area method to fit the datum line to obtain the direction vector of the datum line; The normal vector or the direction vector of the datum line is uniformly recorded as the datum vector .

[0063] Step 3: Set the calculation error allowable value ;...

Embodiment 2

[0083] A calculation method for the effective size of a cylinder with datum constraints. When it is used to calculate the minimum circumscribed size, it is necessary to modify Embodiment 1. The rotation change and size change of the active surface in Embodiment 2 are the same as the rotation change in Embodiment 1. And the reverse change of size change, the specific steps are as follows:

[0084] Step 1: Place the measured part on the measuring platform, and obtain the measuring point coordinates of the datum feature and the measured cylinder in the rectangular coordinate system of the measuring space.

[0085] Step 2: Determine whether the datum feature is a plane or a straight line;

[0086] If the datum feature is a plane, apply the minimum area method to fit the datum plane to obtain the normal vector of the datum plane; if the datum feature is a straight line, apply the minimum area method to fit the datum line to obtain the direction vector of the datum line; The normal...

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Abstract

The invention discloses a computing method of function sizes of a benchmark constrained cylinder. The computing method of the function sizes of the benchmark constrained cylinder comprises measuring and obtaining coordinates of measuring points which are arranged on a cylinder to be measured and a benchmark; fitting the benchmark based on a minimum area to provide a primary parameter of the cylinder to be measured, projecting the measuring points in a plane which is perpendicular to an axis of the cylinder to be measured and fitting the projecting points through a method of computing a function surface of a circle; inquiring a measuring point the cylinder to be measured and the function surface are in contact with and performing corresponding rotating change or size change on the function surface according to coordinates of a contact point; and inquiring the contact point to perform change of the function surface, sequentially performing iterative computations until a discriminate criterion is satisfied and outputting a parameter of the cylinder to be measured.

Description

technical field [0001] The invention relates to a method for calculating the effective size of a cylinder with a reference constraint, which belongs to the field of precision measurement and computer application, and can be used for the effective size of a cylinder with a reference constraint and the inclination of a straight line in any direction in various geometric products. Qualification testing, and provide guidance for the improvement of processing and processing technology. Background technique [0002] Cylinder is one of the most common components in mechanical parts. Its precision has an important impact on product quality, performance and service life, and the function size of cylinder is the main technical parameter of cylindrical parts. The largest inscribed cylinder and the smallest circumscribed cylinder are collectively referred to as the active surface of the cylinder, and the radius of the largest inscribed cylinder and the smallest circumscribed cylinder ar...

Claims

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Application Information

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IPC IPC(8): G01B5/00G01B5/08
Inventor 陈磊磊钟艳茹孙永厚黄美发匡兵
Owner GUILIN UNIV OF ELECTRONIC TECH
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