超声波辅助滚压GCr15轴承钢表面完整性灰色关联分析

GRAY CORRELATION ANALYSIS OF SURFACE INTEGRITY OF ULTRASONIC-ASSISTED ROLLING GCR15 BEARING STEEL

为了实现超声波辅助滚压加工工件表面完整性的合理控制。以GCr15轴承钢为研究对象,选用转速、进给速度和静压力为主要加工参数,通过超声波辅助滚压试验,将灰色理论、响应曲面法和遗传算法相结合,对超声波辅助滚压GCr15轴承钢表面粗糙度、残余应力和硬度进行关联分析,建立灰色关联度预测模型,并对该模型进行优化研究。结果表明:静压力对超声波辅助滚压加工工件表面完整性影响最大,转速次之,进给速度最小;最优加工参数组合为进给速度25 mm/min,转速300 r/min,静压力247 N;此时所对应的表面粗糙度为0.299μm,残余应力为-376.4 N,硬度为759.8 HV。研究结果对提高超声波辅助滚压加工工件表面完整性,确定最优超声波辅助滚压加工参数具有重要的工程意义。

In order to achieve reasonable control of the surface integrity of the workpiece assisted by ultrasonic-assisted rolling.Taking GCr15 bearing steel as the research object,the rotational speed,feed rate and static pressure were selected as the main processing parameters.The ultrasonic-assisted rolling test was used to combine the gray theory,response surface method and genetic algorithm to ultrasonically assisted rolling GCr15 bearing steel.Correlation analysis was carried out on surface roughness,residual stress and hardness,and a grey correlation degree prediction model was established,and the model was optimized.The results show that the static pressure has the greatest influence on the surface integrity of the ultrasonic assisted rolling workpiece,the second speed and the minimum feed rate;the optimal processing parameters are the feed speed 25 mm/min,the speed 300 r/min,the static pressure 247 N;The corresponding surface roughness was 0.299μm,the residual stress was-376.4 N,and the hardness was 759.8 HV.The research results have important engineering significance for improving the surface integrity of ultrasonic assisted rolling workpieces and determining the optimal ultrasonic assisted rolling processing parameters.