成形砂轮修整对18CrNiMo7-6钢磨削表面完整性的影响

Effect of dressing with form grinding wheel on grinding surface integrity of 18CrNiMo7-6 steel

为了探究修整切深ad、轴向进给速度f_(d)和修整速比q_(d)等修整工艺参数对18CrNiMo7-6齿轮钢磨削表面完整性的影响,分别采用树脂结合剂金刚石碟轮、青铜结合剂金刚石碟轮和单颗粒金刚石笔3种修整工具对陶瓷结合剂铬刚玉砂轮进行成形修整工艺正交试验,并用修整后的铬刚玉砂轮对18CrNiMo7-6齿轮钢进行横磨试验。结果表明:随着各修整工艺参数的增大,齿轮钢磨削加工表面粗糙度Ra增大,磨削表面更容易产生残余压应力;通过归一化无量纲方法综合评价3种修整工具的磨削表面完整性,表明采用青铜结合剂金刚石碟轮修整时的磨削表面完整性优于其余2种修整工具的,且当ad=4μm,f_(d)=100 mm/min,q_(d)=0.3时齿轮钢,磨削表面的完整性较优。

In order to explore the influence of dressing process parameters,such as dressing depth ad,axial feed speed f_(d) and dressing speed ratio q_(d),on the grinding surface integrity of 18CrNiMo7-6 gear steel,orthogonal experiments were conducted for shaping dressing process using ceramic bonded chrome corundum grinding wheels with resin bonded diamond disc wheels,bronze bonded diamond disc wheels and single particle diamond pens,respectively.The cross grinding test of 18CrNiMo7-6 gear steel was carried out with a chrome corundum wheel after dressing.The results show that the surface roughness Ra of the grinding process increased with the increase of the dressing process parameters,and residual compressive stresses were more easily obtained on the grinding surface.The comprehensive evaluation of the grinding surface integrity for the three dressing tools,using a normalized dimensionless method,shows that the grinding surface integrity of the bronze-bonded diamond disc wheel dressing is better than the other two dressing methods.Furthermore,the grinding surface integrity is better when ad=4μm,f_(d)=100 mm/min,and q_(d)=0.3.