基于灰色关联分析的35CrMoV钢活塞杆激光熔覆工艺参数优化

为选取优化合理的激光熔覆工艺参数匹配，获得致密性好、耐磨性强的熔覆层，采用激光熔覆技术对基材为35CrMoV钢的已磨损表面进行修复试验。以激光扫描速度、激光熔覆功率、送粉速度为自变量，以正交试验数据为基础，基于灰色系统的理论模型对试验数据进行处理；通过层次分析法计算多目标权重，运用灰色关联理论，分别计算并得到各工艺参数对理想单目标值的关联系数及对多目标值的关联度；将单目标参数优化转换为综合工艺参数优化，获得了优化工艺参数组合：扫描线速度100 mm/s、送粉速度42.8 g/min、激光熔覆功率1.8 kW；通过试验对优化结果进行了检验，结果表明：在最优工艺参数条件下，熔覆层质量得到明显提高，特别是耐磨性相对提高了43%.

Optimization of Laser Cladding Process Parameters of 35CrMoV Piston Rod Based on Grey Correlation Analysis

The laser cladding technology for repairing the worn surface of substrate with 35CrMoV is studied to optimize reasonably the laser cladding process parameter and obtain the cladding layer with excellent compactness and stronger abrasion resistance. The experimental data are processed on the basis of the theoretical model of grey system and the orthogonal test data, of which the scanning speed, laser power and speed of powder delivery are variable. The analytic hierarchy method is used to calculate the multi-target weight, and the grey correlation theory is used to calculate the correlation coefficient of each process parameter for the ideal single target value and the correlation degree to the multiple target value. Single target parameter optimization is converted to the integrate parameter optimization. The scanning line speed is 100 mm/s, the powder delivery speed is 42.8 g/min, and the laser power is 1.8 kW. The optimized results are verified experimentaly. The research shows that, under the the condition of optimal process parameters, the quality of cladding layer is obviously improved, and the wear resistance is increased by 43%.