Casting cooling temperature field reconstruction method and system based on infrared thermogram

By performing grayscale truncation and geometric correction on infrared thermal images, and utilizing the geometric convergence index and mutual radiation gain coefficient, the problem of mutual radiation interference during the cooling process of complex castings was solved, enabling accurate reconstruction and monitoring of the casting temperature field.

CN121860904AActive Publication Date: 2026-04-14XIAN ISE MACHINERY CO LTD
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Patent Information

Application Number
CN202610298781.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-12
Publication Date
2026-04-14
Estimated Expiration
2046-03-12

AI Technical Summary

Technical Problem

Existing infrared thermometry methods suffer from mutual radiation interference during the cooling process of castings with complex geometries, leading to temperature measurement distortion and affecting the adjustment of cooling process parameters and casting quality.

Method used

By acquiring infrared thermal images of the casting during the cooling process, and using methods such as grayscale histogram truncation, geometric convergence index, local energy concentration degree, and mutual radiation gain coefficient, the infrared thermal images are corrected to restore the true surface temperature of the casting.

Benefits of technology

It enables a more accurate reconstruction of the temperature field during the cooling process of castings, improves the accuracy of temperature monitoring, reduces misjudgment of cooling process parameters, and lowers the scrap rate of castings.

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Abstract

The invention relates to the technical field of image processing, in particular to a casting cooling temperature field reconstruction method and system based on an infrared thermogram. The method comprises the steps that a first infrared heat map of a casting in the cooling process is obtained, and truncation processing is conducted on the first infrared heat map to obtain a second infrared heat map; constructing a gray gradient vector of a neighborhood pixel of a target pixel point in the second infrared thermal image, and determining a position vector pointing to the target pixel point from the neighborhood pixel so as to determine a geometric convergence index of the target pixel point; the local energy concentration degree of the target pixel point is determined according to the gray extreme value in the neighborhood, the mutual radiation gain coefficient of the target pixel point is determined according to the geometric convergence index, the local energy concentration degree and the reflection coupling coefficient of the surface of the casting, and the surface temperature information of the casting is obtained according to the mutual radiation gain coefficient. By means of the technical scheme, the temperature field of the casting in the cooling process can be reconstructed more accurately.
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