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Method for measuring diameter size of edge part

A measurement method and technology for parts, applied in measurement devices, instruments, optical devices, etc., can solve problems such as asymmetry, inconspicuousness, and multi-labor

Pending Publication Date: 2021-09-24
RES INST OF ZHEJIANG UNIV TAIZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when measuring with a tether gauge, the measurer must manually measure one by one, which has the disadvantage of requiring a lot of labor.
In addition, due to manual operation, there is also the disadvantage of lack of accuracy
In the measurement using a linear array CCD measuring instrument, it will be affected by many factors, such as the background image is fluctuating, which is related to the background light intensity; there are many noises (spurious points) in the background, especially in the measurement in a dynamic and complex environment Among them, the appearance of noise is random; moreover, the edge of the target is in the shape of a curve, which is not obvious and asymmetrical
Therefore, it is difficult to accurately obtain the diameter size of the measured part

Method used

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  • Method for measuring diameter size of edge part
  • Method for measuring diameter size of edge part
  • Method for measuring diameter size of edge part

Examples

Experimental program
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Effect test

Embodiment 1

[0065] Such as Figure 1 to Figure 8 As shown, a method for measuring the diameter of an edge part, the size measuring instrument includes a linear array CCD image acquisition device 16 on the left, a light reflection structure on the right, and a part to be detected in the middle, and the linear array CCD image acquisition device 16 on the left The linear array CCD camera shoots the parts, and then the processor in the left linear array CCD image acquisition device 16 performs data processing.

[0066] The size measuring instrument has a left-right symmetrical structure as a whole, which includes a left part 1, a right part 2 and a bottom part 3. The left part 1 and the right part 2 have the same shape. The bottom 3 is provided with guide grooves 31 on both sides of the side away from the left part 1, which is convenient for setting the size measuring instrument on other equipment.

[0067] The left part 1 includes a left right-angled trapezoidal part 13 and a left quadrangu...

Embodiment 2

[0127] The present embodiment is basically the same as Embodiment 1, and the difference of the present embodiment is that step 4) adopts the derivation to the straight line function of fitting, draws in interval [a, b], between [c, d] Optimize the edge coordinates of the left and right sides, so as to obtain the most accurate coordinate value.

[0128] The basic model adopted for the measurement of the part diameter in step 5) is as follows:

[0129]

[0130] Where d is the diameter of the part (mm); h is the width of a single linear array pixel (mm); ΔP is the number of linear array pixels blocked by the part; β is the magnification of the optical system.

[0131] Then Δp=p R -p L , where P R Indicates a point where the slope of the right edge is the largest; P L Indicates a point where the slope of the left edge is the largest;

[0132] Then the part diameter is obtained from the following formula:

[0133]

[0134] Among them, d is the diameter of the part (mm);...

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Abstract

The invention discloses a method for measuring the diameter size of an edge part. The method specifically comprises the steps of (1) linear array CCD data processing, (2) data fitting and edge point positioning, (3) edge coarse positioning, (4) size initial measurement and (5) size measurement. The invention provides the method for measuring the diameter size of the edge part, which is reasonable in design and high in measurement precision.

Description

technical field [0001] The invention relates to the technical field of size measurement, more specifically, it relates to a method for measuring the diameter of edge parts. Background technique [0002] In the prior art, when measuring the diameter of a small cylindrical workpiece such as a metal nozzle, a measurer puts a plug gauge of a certain size on the outside of the workpiece for measurement. In addition, when performing automatic measurement, the workpiece is placed on a V table, etc., the stylus of the contact measuring instrument is brought into contact with the outer diameter portion, the workpiece is rotated, and the inner diameter of the workpiece is obtained from the displacement of the stylus at this time. size. Alternatively, the end face of the workpiece placed on the V stage or the like is imaged with a CCD camera, and the inner diameter of the workpiece is obtained by image processing based on the obtained image data. [0003] However, when measuring usin...

Claims

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Application Information

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IPC IPC(8): G01B11/08
CPCG01B11/08
Inventor 梅武军袁国堂蒋婷婷龚哲
Owner RES INST OF ZHEJIANG UNIV TAIZHOU