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Method for acquiring precise contour of workpiece, machine tool and storage medium

A workpiece and precise technology, applied in the field of workpiece processing equipment, can solve the problems of limited accuracy, difficulty in detecting the error of workpiece contour shape, complicated programming, etc., and achieve the effects of reducing material waste, saving money, precision and cost.

Pending Publication Date: 2021-10-22
柔胜刚智能科技苏州有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Nowadays, there are technical problems in the detection of large flat workpieces. For example, for workpieces with a size of more than two meters, the drawings of the workpiece are normally available; the existing general inspection tools have a certain detection range, although they are like tape measures. The measuring tool can roughly measure a large distance between two points, but the accuracy is very limited, and errors of the order of millimeters are very common
It is even more difficult to detect the error of the contour shape of the workpiece.
[0003] In order to obtain a high-precision workpiece profile, a three-coordinate measuring instrument can be used to measure the workpiece point by point in the prior art, but the existing three-coordinate measuring instrument is expensive to use, complicated to program, and still cannot measure super-large workpieces

Method used

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  • Method for acquiring precise contour of workpiece, machine tool and storage medium
  • Method for acquiring precise contour of workpiece, machine tool and storage medium
  • Method for acquiring precise contour of workpiece, machine tool and storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] A method for obtaining an accurate profile of a workpiece: comprising the following steps:

[0069] S1: Provide an image acquisition device that is installed on the movement mechanism and moves with the movement of the movement mechanism; the image acquisition device in this embodiment is an industrial camera.

[0070] The specific parameters of the camera in this embodiment are that the field of view of the image is 500mm×500mm, the distance between the camera and the object to be measured is 500mm, and the measurement accuracy of the image should reach 0.05mm; the camera Basler_acA2440-75uc: the frame rate reaches 75fps, the resolution 5 million pixels (2448px×2048px), chip size 8.4mm×7.1mm, chip type CMOS, interface usb3.0, color camera; lens ML-M0822UR: 8mm lens, object distance 580mm, field of view 660×500mm. If the 1 / 5 sub-pixel edge detection algorithm is used, the horizontal measurement accuracy of the workpiece image can reach 0.054mm / px, and the vertical measu...

Embodiment 2

[0096] The difference between this embodiment and Embodiment 1 is that: performing step S5 includes a workpiece image contour smoothing process for eliminating burrs, fractures and unevenness problems in the workpiece contour line, and the smoothing process includes the following steps:

[0097] N1: Analyze the error characteristics of the extracted workpiece contour;

[0098] N2: Detect and eliminate these contour segments with errors;

[0099] N3: Replace multiple line segments fitted by straight lines or arcs with fitted line segments;

[0100] N4: Use B-spline curves to replace multiple line segments that cannot be fitted with straight lines or arcs;

[0101] N5: Obtain a complete and smooth contour line of the workpiece.

[0102] Firstly, analyze the error features of the extracted workpiece contour, and propose a detection method that can identify these error feature information, which is used to detect and eliminate these error contour line segments, and can be fitted...

Embodiment 3

[0104] The difference between this embodiment and Embodiment 2 is that step S1 in this embodiment also includes: setting an industrial light source and a polarizer for illuminating the workpiece to be tested; step S2 also includes: using an industrial light source to unilaterally or multilaterally Irradiate the workpiece to be tested, highlight the edge features of the workpiece to be tested, and reduce the reflection phenomenon of metal workpieces in the imaging occasion of large-sized workpieces; and use the polarizer installed on the lens to reduce or eliminate astigmatism, reflection, glare and other interference role. The combined use of industrial light sources and polarizers can eliminate the reflection phenomenon of the workpiece to a certain extent, and avoid the unfavorable image caused by the reflection of the workpiece on the later image processing. In other embodiments, it is also possible to illuminate from above the workpiece to be tested. This method is to use ...

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Abstract

The invention discloses a method for acquiring a precise contour of a workpiece. The method comprises the following steps: S1, mounting an image acquisition device on a movement mechanism capable of realizing precise movement; S2, performing multi-point accurate movement through an image acquisition device, acquiring the workpiece, and obtaining multi-point image information of the workpiece; S3, performing image splicing on the image information in the step S2 to obtain complete workpiece image information; and S4, carrying out contour extraction on the workpiece image information in the step S3 to obtain accurate contour information of the workpiece. When an ultra-large workpiece is detected, the method is easy to operate, the workpiece does not need to be moved, accurate contour information of the workpiece can be obtained, and the method has the advantages of being time-saving, labor-saving, money-saving and high in precision.

Description

technical field [0001] The present invention relates to the technical field of workpiece processing equipment, in particular, a method for obtaining a precise contour of a workpiece, a machine tool and a storage medium. Background technique [0002] Nowadays, there are technical problems in the detection of large flat workpieces. For example, for workpieces with a size of more than two meters, the drawings of the workpiece are normally available; the existing general inspection tools have a certain detection range, although they are like tape measures. The measuring tool can roughly measure a large distance between two points, but the accuracy is very limited, and errors on the order of millimeters are very common. It is even more difficult to detect the error of the contour shape of the workpiece. [0003] In order to obtain a high-precision workpiece profile, a three-coordinate measuring instrument can be used to measure the workpiece point by point in the prior art, but ...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T7/13G06T5/00G06T3/40G06K9/46G06K9/62
CPCG06T7/0004G06T7/13G06T3/4038G06T2207/10004G06T2207/30164G06T2200/32G06F18/24147G06T5/80G06T5/70
Inventor 李智曾继跃张仕进
Owner 柔胜刚智能科技苏州有限公司
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