Heat flux based laser cleaning quality online detection system and method

Abstract

The invention relates to a heat flux based laser cleaning quality online detection system and a method. A supporting structure of the system is connected with a laser cleaning detection device through a sliding connecting piece. The method comprises the steps that a heat flux sensor is started to correct the cleaning environment temperature, and a laser cleaning module is started to carry out laser cleaning on a workpiece; and a scanning laser detection module is started, when the heat flux, detected by the heat flux sensor, of the workpiece surface is equal to the heat flux of a workpiece base material, a linear scanning laser detection module determines that the workpiece surface is free of areas where protrusions and pits are located, and cleaning is finished. The air hole defect generated by workpiece cleaning is detected by utilizing different convection heat conduction coefficients between different materials on the workpiece surface and the atmosphere and different convection heat conduction coefficients between different shapes of the workpiece surface and the atmosphere, and the problems that only one of cleaning quality and workpiece flaw detection of the previous laser cleaning detection technology is considered, and cleaning quality and workpiece flaw detection cannot be considered at the same time are solved.

Description

technical field [0001] The invention relates to the field of laser cleaning, in particular to an online detection system and method for laser cleaning quality based on heat flux. Background technique [0002] In the process of industrial production, cleaning the surface of workpieces has always been a very important link. Traditional cleaning technologies, such as chemical reagent cleaning and physical grinding and cleaning, have complicated cleaning procedures, heavy pollution, difficult to guarantee cleaning effects, and easy damage to materials. The surface is damaged, which largely restricts the development of the cleaning industry. Since the birth of laser cleaning technology, laser cleaning has unique advantages compared with traditional cleaning processes. Its cleaning effect is non-contact, non-destructive, chemical-free, and pollution-free. It is environmentally friendly, localized non-destructive high-precision cleaning, and safe and convenient to operate. , Easy ...

AI Technical Summary

Problems solved by technology

Traditional detection methods such as magnetic particle, eddy current, and penetration have shortcomings such as low detection accuracy, need for contact detection, and offline detection. Some detection methods require the use of chemical reagents, which will inevitably pollute materials or the environment; many traditional detection methods require contact. It is inconvenient to use and does not support online detection; these technical means also have the disadvantage of low detection accuracy, and it is difficult to detect very small defects on the surface of the workpiece

At the same time, most of the various online testing equipment currently on the market focus on the detection of laser cleaning cleanliness, while ignoring the detection of pore defects generated during the laser cleaning process, which has caused great safety hazards for the workpiece to be put into industrial production later. Moreover, most of these online detection methods work with a single sensor, and its detection accuracy is difficult to guarantee, and it is difficult to realize the detection of micron-level defects.

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