大面积激光自动涂敷系统及其工业应用

New development of laser cladding system for larger area and its industrial application

为解决冶金轧辊大面积激光涂敷的需要，研制了一套宽带激光自动涂敷系统．它由宽带扫描转镜和自动喷粉机组成，适用激光功率１～１０ｋＷ，既可用于宽带涂敷，又可直接用于聚焦窄带涂敷；单道一次涂敷宽度１０～３５ｍｍ连续可调，涂敷厚度０．２～８ｍｍ可控；送粉量０．５～２００ｇ／ｍｉｎ连续精密可调，送粉精度＜２％．它不仅适用于普通送粉，而且也适用于特殊条件下的微量送粉和大粉量送粉．送粉材料适应性广，不仅用于一般Ｎｉ基、Ｆｅ基等粉末，而且能用于ＷＣ、ＴｉＮ等硬质合金粉、Ｃｕ粉和超细微陶瓷粉，如Ａｌ２Ｏ３、ＺｒＯ２等，粉末粒度１６～１５０μ，送粉利用率高达９８％以上．该套系统采用专利结构制成，结构紧凑，外形美观，已用于轧辊的大面积涂敷和激光淬火、汽车凸轮轴激光淬火和熔凝处理、轧辊和曲轴等零件表面补焊等方面．

A new laser cladding system for larger area for industrial application has been developed. It consists of a wideband scanning mirror and an automatic powder feeder by the rotating feed wheel with buckettype scoops. It shows that all kinds of laser cladding powders including not only Nibase, Febase, Cobase, but also superfine and lighty powedrs ceramics ZrO2,Al2O3 as well as supe-fine and weighty WC, TiC with spherical and edged grains can be fed. The powder feed rate can be continuously varied from 0.5 to 200 g/min. The measured tolerance limits are less than 2% in all conditions,and the powder feeder has delivering power functions of both wideband of 10～35mm and focussing band. Without the carrier gas,the powder flow depends mainly on gravity, the powder stream at the nozzle is uniform,and the powder utilization factor is over 98%. Some applications to metallurgical industry have successfully been tried.