Method and device for real-time thickness measurement and feedback of laser cladding

Abstract

The invention relates to the technical field of laser cladding, and specifically discloses a method and a device for real-time thickness measurement and feedback of laser cladding. The method for real-time thickness measurement and feedback of laser cladding is characterized in that: a laser displacement sensor is installed near a laser processing head and driven along the laser processing head; the measurement laser of the laser displacement sensor is perpendicular to the laser cladding layer of a workpiece, and a measurement point of the measurement laser is arranged on the same arc as a molten pool and close to the joint of the two laser cladding layers; the laser displacement sensor is used for measuring the height of the cladding layer and feeding the measured value back to a controller; the controller finishes the value calculation, display and feedback, and then the controller controls the cladding parameters of the laser processing head, so that the final size meets the requirement. The method and device provided by the invention can adjust the laser processing parameters through the closed-loop control, control the thickness of the cladding layer precisely, reduce the manual measurement error, reduce the powder waste, and effectively improve the cladding efficiency and the qualified rate of the processed finished product.

Description

[0001] (1) Technical field [0002] The invention relates to the technical field of laser cladding, in particular to a real-time thickness measurement and feedback method and device for laser cladding. [0003] (2) Background technology [0004] Laser cladding, also known as laser cladding or laser cladding, is a new surface modification technology. It forms a metallurgically bonded cladding layer on the surface of the base by adding cladding materials to the surface of the substrate and using a high-energy-density laser beam to melt it together with the thin layer on the surface of the substrate. As a new surface treatment technology, laser cladding has been widely used in the field of engineering machinery manufacturing and remanufacturing. [0005] Regarding the application of laser cladding coating thickness measurement technology, the application number is 201810766782.8, and the patent name is "a laser cladding closed-loop control method based on stereo vision", which di...

AI Technical Summary

Problems solved by technology

[0006] The measurement accuracy of the above-mentioned control technology is high, but laser cladding is a processing process that is affected by many factors such as laser power, powder, and matrix properties. In the actual complex industrial production environment, capturing the image of the molten pool will be interfered by many factors. It is easy to be blocked, and the temperature around the molten pool is high and there is a lot of dust, which also has high requirements for the long-term high-temperature stable operation of the CCD and the cleaning of the lens; in addition, the cost of the CCD camera is high, which increases the cost of equipment, and the calibration process is more complicated. , there are certain limitations in large-scale industrial applications

[0007] At present, in the actual production of shaft laser cladding, manual measurement is mostly used, that is, the outer diameter of the workpiece is clamped by a caliper, and then the size is measured on a ruler. This method is simple to operate and has almost no equipment cost, but it is affected by human factors. The impact is large, and the measurement results of different individuals vary greatly due to different habits and hand feel, and the dimensional accuracy is low

In addition, it is difficult to manually measure the partial cladding of some large workpieces, and it is even impossible to measure some special-shaped surfaces, and the coating thickness can only be estimated by experience

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