Laser-cladding closed-loop control method based on stereoscopic vision

Abstract

The invention provides a laser-cladding closed-loop control method based on stereoscopic vision. The method comprises the steps: respectively installing CCDs, which are connected with a control systemand move synchronously, at two opposite sides of a laser, and performing the calibration of the two CCDs; enabling the two CCDs to monitor a furnace hearth at the same time; enabling a control systemto compare the obtained data with a standard shape of a preset cladding forming layer to obtain a width error and a height error; taking the width error and the height error as the input of a fuzzy controller, and taking the variation of a controlled quantity as the output, thereby obtaining the adjustment variation of laser power or a defocusing quantity, and achieving the precise adjustment ofthe cladding precision and quality. The method employs the two CCDs for obtain the furnace hearth change images in real time during the laser cladding, and then employs a control system for comparisonwith the standard shape of the preset cladding forming layer, achieves the adjustment of a laser according to an error, and enables a current furnace hearth to be always consistent with the preset cladding forming layer, achieves the real-time control of a cladding process, and achieves the improvement of the cladding precision and quality.

Description

technical field [0001] The invention relates to the field of material processing, in particular to a laser cladding closed-loop control method based on stereo vision to improve the quality and precision of laser cladding. Background technique [0002] Laser cladding is a new surface modification technology. It uses high-energy laser to irradiate metal to make the metal melt, expand and solidify rapidly, and clad a layer of material with special physical, chemical or mechanical properties on the surface of the substrate. Thus forming a new composite material, and then improving the wear resistance, corrosion resistance, heat resistance, oxidation resistance and other properties of the surface of the matrix material, it is currently widely used in automobile manufacturing, aerospace, petrochemical and other fields. [0003] However, in the process of laser cladding, due to the complexity of the forming process and the influence of various factors, it is easy to cause the insta...

AI Technical Summary

Problems solved by technology

[0004] In response to this problem, the existing solutions generally only monitor the height of the cladding layer, while ignoring the influence of the width of the cladding layer, which limits the improvement of precision control.

In addition, although there are some solutions that also expand to adjust the width of the cladding layer, the adjustment object is only the spot shape of a specific broadband, and it cannot target any spot shape, which has great limitations.

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