垂直面送粉激光强化系统与应用研究

针对汽车发动机缸体、缸套、模具侧壁等垂直表面激光强化的需求 ,研制了垂直面送粉喷嘴和垂直面送粉激光强化系统 ,适合于内侧和外侧垂直面送粉激光熔覆和合金化及不送粉熔凝、相变硬化 ;利用该系统 ,选择合适的激光处理工艺参数 ,在垂直放置的灰铸铁表面进行了激光熔凝、送粉激光合金化、送粉激光熔覆等表面处理 ,分析了处理层的显微组织 ,合金元素成分分布与硬度分布。激光强化显著提高了基材的使用性能。垂直面送粉激光强化技术有良好的工业应用前景。

Investigation on Laser Modification with Powder Feeding for Vertical Surfaces

In many applications such as cylinder body, sleeve and mould side wall, vertical surfaces need to be strengthened together with horizontal surfaces. In this paper, a new laser cladding nozzle with powder feeding for vertical surface modification was designed and a whole laser surface modification system with powder feeding for vertical surfaces is developed. By using this system, experimental work on laser remelting, laser alloying with powder feeding, laser cladding with powder feeding was performed on vertical gray iron substrate surfaces. The microstructure, the composition and the hardness distribution were analyzed. The results indicate that the properties of the vertical surfaces have been greatly improved after these modifications. The vertical processing and powder feeding nozzle can realize various vertical surface modifications with or without powder feeding, which has a promising prospect in industry applications.