Laser surface treatment quality control method

Abstract

The invention provides a laser surface treatment quality control method and an on-line monitoring system thereof. The laser surface treatment quality control method comprises the steps that incident laser is emitted through a laser, passes through an inner transmission light path, and at last is focused on a workpiece through a focus lens; the light reflected on the surface of the workpiece in practical processing is detected through a first photoelectric sensor; the light is converted to be a reflective power value through photovoltaic conversion; the residual penetration light of the reflective lens surface of a reflective lens in the transmission light path is detected through a second photoelectric sensor to obtain the practical power; parameters, set power, the reflective power value and the practical power are sent to a central processing unit to be subjected to comparison calculation through a data collection unit, and a mass control factor is determined through logic judgment; the mass control real-time information is displayed through an image display device. The invention guarantees the high consistence of laser power density of the laser in the material surface treatment process and the accuracy of the height position of a laser focal point on a material surface.

Description

technical field [0001] The invention relates to a quality control method for laser surface treatment. Background technique [0002] Laser surface treatment technology is a cutting-edge technology that has gradually emerged in recent years. Its application prospects are very broad, especially in metal surface treatment. To put it simply, the principle of this technology is to use the laser beam to quickly scan the object to be processed, so that the surface of the workpiece can be melted rapidly or form physical features such as grooves on the surface through thermal stress, or form thin layers of different depths. to replace mechanical surface treatment or chemical surface treatment. Subsequent methods such as vacuum evaporation, electroplating, etc. can be used to coat the alloy elements on the surface of the workpiece, fully fuse with the base metal under laser irradiation, and obtain an alloy layer with special properties after condensation. For example, the surface of ...

AI Technical Summary

Problems solved by technology

This technology has the following disadvantages: 1) Since the power of each laser and the focusing lens cannot be completely consistent, the scanning line segments on the workpiece cannot be completely consistent, which will lead to the final processing of each position on the terminal. The processing quality is not the same; 2) Due to the large number of lasers required, especially when the workpiece is dynamic and moving at a high speed, even hundreds of lasers are required. Such a large number of lasers will undoubtedly increase the difficulty of on-site monitoring and maintenance ;3) The surface of some processed parts will be coated with special materials (such as the insulating coating on the surface of the steel plate), this treatment technology will destroy the coating

Key factors such as the effectiveness of optical transmission in the laser processing system, the size of the focus spot, and the height of the focus are particularly important. Due to factors such as the working environment, component aging during use, and a series of problems such as precision adjustment, the key factors in laser processing will be Large changes, leading to quality can not be guaranteed, there is still a lack of an effective quality monitoring method and its online monitoring system

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