Closed-loop laser processing quality control device and method based on molten pool splash detection

Abstract

The invention provides a molten pool splash detection based closed-loop laser processing quality control device which comprises a laser processing head, a splash baffle and multiple thermal imagers. The laser processing head is cylindrical, a conic processing nozzle is arranged at the tail end of the bottom of the laser processing head, a focusing mirror and a protection lens are arranged in an inner cavity of the laser processing head, and a protection air curtain is arranged on the outer side wall of the laser processing head. The splash baffle surrounds the periphery of the laser processing head and is in an umbrella shape, a circulating water cooling channel is arranged in the splash baffle, and a water inlet and a water outlet are formed in the upper surface of the splash baffle. The splash baffle is connected with the laser processing head through a detachable structure. The multiple thermal imagers are evenly arranged on the outer wall of the laser processing head and located below the splash baffle. According to the molten pool splash detection based closed-loop laser processing quality control device, the process of analyzing the quality of the laser processing technology in the laser processing process in real time is feasible, online real-time adjustment of laser processing technology parameters is combined, and complete processing quality closed-loop control is achieved. The invention further provides a molten pool splash detection based closed-loop laser processing quality control method.

Description

technical field [0001] The invention belongs to the field of laser processing, and in particular relates to a closed-loop laser processing quality control device and method based on molten pool spatter detection. Background technique [0002] Laser processing technology is a technology that uses the characteristics of the interaction between laser beams and substances to cut, weld, cladding, surface treatment, drilling, micromachining, etc. on materials (including metals and non-metals). As an advanced manufacturing technology, laser processing has been widely used in important sectors of the national economy such as automobiles, electronics, electrical appliances, aviation, metallurgy, and machinery manufacturing. It has played an increasingly important role in improving product quality, labor productivity, automation, pollution-free, and reducing material consumption. important role. [0003] With the development of laser processing technology, laser welding technology ha...

AI Technical Summary

Problems solved by technology

Due to the high energy density of the laser, the small size of the molten pool, and the complex thermal process, it has brought great difficulties to the detection of the temperature field of the molten pool. Most studies can only give the temperature of the laser molten pool or points near the laser molten pool. , and then use the mathematical analysis method to derive the temperature field distribution

With the development of high-temperature detection technology and charge-coupled device (CCD) technology, the use of CCD for temperature field and dynamic process detection has been developed rapidly. CCD needs to be combined with image processing technology. Image processing technology such as color processing, according to the characteristics of the collected molten pool image, in principle makes it possible to obtain the distribution of the temperature field of the laser molten pool through image processing, but there is currently no closed-loop laser processing quality control device based on molten pool spatter detection and methods

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