Circular saw blade wear amount online measurement method based on machine vision
A measurement method and machine vision technology, applied in the field of image processing, can solve the problems of inability to realize online measurement of the wear amount of circular saw blades, difficult to find, etc.
Inactive Publication Date: 2015-12-30
CETC NINGBO MARINE ELECTRONICS RES INST
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Based on the optimization of circular saw blade profile, this method proposes an improved quadratic polynomial interpolation sub-pixel positioning method for the inner circular hole of the circular saw blade, and uses the improved least squares method to fit the two straight lines of the tooth tip, which improves the detection efficiency. Accuracy, but this method must obtain the entire image of the circular saw blade, so the online measurement of the wear amount of the circular saw blade cannot be realized
Swedish Ekevad et al constructed the relationship between the wear amount of the circular saw blade and the vibration signal of the saw blade in the process of sawing beech. It is difficult to find the exact quantitative relationship of the vibration signal of the saw blade, and only the qualitative detection of the wear amount of the circular saw blade can be carried out
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[0077] When cutting, the circular saw blade and the workpiece move relatively, under the action of the cutting force, wear occurs, and the shape of the cutting edge changes (such as figure 1 shown). A is the frontmost point of the rake face, that is, the entry point of the cutting edge; B is the contact point between the flank and the workpiece, and C is the ideal point of the tool tip. The three parameters of mouth wear SB and negative clearance H are used to measure the wear of circular saw blades, where SF reflects the wear of the rake edge of the tool, SB reflects the wear of the flank edge of the tool, and H reflects the cutting edge wear. The deformation of the workpiece caused by the extrusion of the cutting edge on the workpiece.
[0078] Before the online measurement of the wear amount of the circular saw blade, the industrial camera is calibrated. The method is to install a calibration object with a known size at the position where the circular saw blade is installe...
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The invention discloses a circular saw blade wear amount online measurement method based on machine vision. The measurement method is based on a measurement device which comprises an industrial camera, an image acquisition card and an industrial control computer. The measurement method comprises the steps that the image acquisition card is triggered by the industrial control computer, and a circular saw blade image is obtained through the industrial camera; preprocessing and binary processing are performed on the image; the single pixel edges of the circular saw blade image are extracted; the straight line segments of the circular saw blade edges are extracted; the two line segments on the same saw tooth are determined; and front knife face cutting edge wear amount and rear knife face cutting edge wear amount of the circular saw blade are solved. The circular saw blade wear amount online measurement method is great in real-time performance and high in detection precision and is the effective circular saw blade wear amount online measurement method, and the reliable basis is provided for compensation of a compensation mechanism by the detection result so that plate material cutting efficiency and quality can be enhanced.
Description
technical field [0001] The invention belongs to the technical field of image processing, and relates to a method for visually detecting the wear state of a tool, and more specifically, relates to an online measurement method for the amount of wear of a circular saw blade. The method extracts the edge of the circular saw blade image, detects the rake face line segment and the flank face line segment of the saw teeth of the circular saw blade, and then calculates the wear amount of the circular saw blade. Background technique [0002] Tool wear monitoring technology can be divided into indirect method and direct method from the measurement means. The direct method is a method to determine the wear state of the tool according to the relevant calibration relationship by measuring the change of the shape, quality or position of the tool edge. The indirect method is to determine the tool wear state according to the relevant calibration relationship by measuring the change of one ...
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IPC IPC(8): G01B11/00
Inventor 齐继阳唐文献魏赛李钦奉孟洋陆震云
Owner CETC NINGBO MARINE ELECTRONICS RES INST
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