扩孔参数对AF1410超高强度钢切屑微观形貌的影响

Effect of Reaming Parameters on Chip Morphology of AF1410 Ultra-high Strength Steel

通过对AF1410钢扩孔加工试验探究主轴转速和进给速度对切屑微观形貌的影响,为改善切屑形貌提升AF1410超高强度钢的扩孔质量提供依据。对有典型形貌特征切屑的自由表面、后表面和上表面进行观测,结果表明,切屑自由表面均为锯齿状片层结构且锯齿片层的宽度随主轴转速和进给速度的增加而增加。切屑后表面整体较光滑,随着主轴转速的增加,后表面光滑程度增加,利于提升已加工表面质量,且在主轴转速为800r/min时,顶部出现撕裂锯齿状毛边,同时进给速度对后表面影响较小。切屑上表面均呈周期锯齿状,切屑厚度随主轴转速增加而减小,锯齿高度随着主轴转速和进给速度的增加而增加。

Due to its high tensile strength and good fracture toughness,long spiral chip shape often appears during hole making,which affects the processing quality.Through reaming of AF1410 steel,this test explores the effect of spindle speed and feed speed on chip micro-topography,and provides basis for improving chip morphology and improving reaming quality of AF1410 ultra-high strength steel.After observing the free surface,back surface and top surface with typical chip morphology,the results show that the free surface of the chip is of saw tooth lamellar structure and the width of the saw tooth lamellar increases with the increase of the spindle drilling speed and feed speed.The back surface is generally smooth.With the increase of the spindle speed,the surface smoothness increases,which is conducive to improving the processed quality,and there is tearing serrated burr at the top when the drilling speed is 800r/min.The feed speed has little effect on the back surface.The top surface of the chip is in the form of periodic sawtooth.The chip thickness decreases with the increase of spindle speed,and the sawtooth height increases with the increase of spindle speed and feed speed.