不同送料工艺对液压支架激光熔覆再制造的影响

Influence of Different Feeding Process on Laser Cladding Remanufacturing of Hydraulic Support

液压支架是煤矿综采系统中的重要设备,环境的复杂性和特殊性对液压支架的使用寿命和性能造成严重威胁,为了提高液压支架立柱的耐磨蚀性能,采用激光熔覆技术对立柱表面进行修复强化处理。本文采用同轴送粉、旁轴送粉和丝材熔覆三种送料工艺,在液压支架立柱表面制备单层和多层的熔覆涂层。对不同送料工艺对应熔覆层力学性能进行分析研究,发现试件的表面硬度大小顺序为:同轴送粉试件>旁轴送粉试件>丝材熔覆试件,并且同轴送粉、旁轴送粉、丝材熔覆获得的涂层硬度分别是基材的2.3倍、2.2倍及2.1倍。使用同轴送粉、旁轴送粉和丝材熔覆技术,均可在柱状27SiMn钢表面得到性能优异的不锈钢熔覆层。通过对三种不同送料工艺下熔覆层进行分析研究,发现同等加工参数下,丝材激光熔覆的综合性能优于粉末激光熔覆,并且在进行大型承载设备修复时,丝材激光熔覆的材料利用率更高。

Hydraulic support is an important equipment in fully mechanized coal mining system.Due to the complexity and particularity of the environment,it poses a serious threat to the service life and performance of hydraulic support.In order to improve the wear resistance of hydraulic support column,laser cladding technology is used to repair and strengthen the column surface.In this paper,single layer and multi⁃layer cladding coatings were prepared on the surface of hydraulic support column by coaxial powder feeding,side shaft powder feeding and wire cladding three feeding process.The mechanical properties of cladding layer with different feeding processes were analyzed.It is found that the order of surface hardness of samples is:coaxial powder feeding sample is larger than side shaft powder feeding sample,and larger than wire cladding sample,and the coating hardness obtained by coaxial powder feeding,side shaft powder feeding and wire cladding is 2.3 times,2.2 times and 2.1 times of the substrate respectively.The stainless steel cladding layer with excellent properties can be obtained on the surface of column 27SiMn Steel by means of coaxial powder feeding,side axis powder feeding and wire cladding technology.Through the analysis and research of the cladding layer under three different feeding processes,it is found that the comprehensive performance of laser cladding of wire is better than that of powder laser cladding under the same processing parameters.In addition,the utilization rate of laser cladding is higher when repairing large⁃scale load⁃bearing equipment.