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

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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 t

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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
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Example Embodiment

[0067] Example 1:

[0068] A method for obtaining a precision profile of a workpiece: comprising the steps of:

[0069] S1: An image acquisition device mounted on a motion mechanism and moving with a motion mechanism; the image acquisition device in this embodiment is an industrial camera.

[0070] In the present embodiment, the specific parameters of the camera are 500 mm × 500mm in the field of view, and the distance to be tested is 500mm. The measurement accuracy of the image should reach 0.05 mm; the camera BASLER_ACA2440-75UC: frame rate of 75fps, resolution 5 megapixel (2448PX × 2048PX), chip size 8.4mm × 7.1mm, chip type CMOS, interface USB3.0, color camera If a 1 / 5 sub-pixel edge detection algorithm is used, the horizontal measurement accuracy of the workpiece image can reach 0.054 mm / px, and the vertical measurement accuracy can reach 0.048 mm / px.

[0071] S2: Collect the workpiece by the multi-point bit of the image acquisition device, acquire multi-point image infor...

Example Embodiment

[0095] Example 2:

[0096] The present embodiment differs from the first embodiment in that the workpiece image contour smoothing process for eliminating the workpiece contour in which the workpiece contour is presented, the smoothing process includes the following steps:

[0097] N1: Analysis of the error characteristics of the extracted workpiece profile;

[0098] N2: Detection and elimination of outline segments of these existence errors;

[0099] N3: Replace multiple line segments of line or arc fitted with the pixel segment;

[0100] N4: Multiple line segments that cannot be fitted with straight or arcs with a B-spline curve;

[0101] N5: Get complete, smooth workpiece outline.

[0102] First, the error characteristics of the extracted workpiece profile are analyzed, and a method of detecting these error feature information is proposed to detect and remove the outline segments of these existence errors. Subtraction is replaced by a fitting line segment to reduce the number of...

Example Embodiment

[0103] Example 3:

[0104] The difference from the second embodiment is that the step S1 in the present embodiment further includes: a industrial light source and a polarizing mirror for taking the workpiece; step S2 further includes: using an industrial light source unilateral or multilateral to a certain angle The workpiece to be tested, highlight the edge characteristics of the workpiece to be tested, to reduce the reflective phenomenon of the metal workpiece in the imaging occasion of the large-sized workpiece; and reduce or eliminate disturbances such as astigmatism, reflective, glare, etc. Role. The use of industrial light sources and polarizers can eliminate the reflective phenomena of the workpiece to a certain extent, avoiding an adverse image due to the reflective post-image processing of the workpiece. In other embodiments, it is also possible to light up from the pending workpiece, the method, using a large backlight to illuminate all the surface of the metal workpiece...

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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
CPCG06T7/0004G06T7/13G06T5/002G06T5/006G06T3/4038G06T2207/10004G06T2207/30164G06T2200/32G06F18/24147
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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