Non-contact on-line measurement method of aluminum ingot thickness

Abstract

The invention discloses a non-contact on-line measurement method of aluminum ingot thickness. Firstly, the method simplifies the modeling of aluminum ingot mold and constructs a functional relationship between mold width and thickness, so as to convert the thickness difficult to measure in horizontal direction into the width easy to measure, and the width information is captured by a camera imagefor collection. Then, the RGB color model of the captured aluminum ingot image is converted into an HSV color model, and the color candidate regions are segmented and extracted according to the S information in the HSV color model. Then the original color image is transformed into the normalized gray-scale image. After preprocessing and gray-scale morphology operation, the width of aluminum ingotis detected by Hough transform. Finally, according to the functional relationship between the width and thickness of aluminum ingots, the thickness of aluminum ingots is measured. HSV color space selected by that invention can identify the width of the aluminum ingot more quickly and stably, thereby realizing the non-contact measurement of the thickness of the aluminum ingot.

Description

technical field [0001] The technical solution of the invention relates to the field of metal thermal processing, in particular to a non-contact online measurement method for the thickness of an aluminum ingot. Background technique [0002] In the process of manufacturing aluminum ingots, the requirements for the thickness of the aluminum ingot are relatively high. Once it is too thick or too thin, the shape of the aluminum ingot will change, and eventually the aluminum ingot will be directly scrapped and cannot be used. Therefore, it has very important practical significance to measure the thickness of the aluminum ingot in real time during the aluminum ingot manufacturing process. Due to the high temperature of the aluminum ingot during the casting process and the limitation of the actual equipment, it is impossible to directly measure the thickness of the aluminum ingot. Therefore, the more common method of controlling the thickness of the aluminum ingot is to judge the th...

AI Technical Summary

Problems solved by technology

However, this thickness control method also has limitations: since the ranging plane of the laser rangefinder is the surface of the aluminum ingot, the aluminum ingot is still in a molten state at this time, and the surface heat radiation is very strong, which will radiate infrared rays and affect the laser ranging At the same time, because the mold is moving during the casting process, this movement is not smooth, which will cause the molten aluminum to shake, and the surface of the molten aluminum at this time cannot accurately reflect the final aluminum ingot The true thickness of the , so there will be unavoidable errors

Combining these problems, it is urgent to find a thickness measurement method that can solve the above problems, but there are few related researches on the thickness measurement of aluminum ingots

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