%0 Journal Article
%T TC4钛合金螺旋铣孔工艺孔壁表面完整性研究<br>Study on Surface Integrity of Hole in Helical Milling Process of TC4 Titanium Alloy
%A 江跃东
%A 何改云
%A 秦旭达
%A 赵庆
%J 机械科学与技术
%D 2015
%X 研究了螺旋铣孔工艺参数(主轴转速、每齿切向进给以及螺距)对TC4钛合金孔壁表面完整性的影响规律。通过开展TC4钛合金螺旋铣孔加工正交试验并利用粗糙度仪、显微硬度计、X射线应力仪、金相显微镜等测量分析了螺旋铣孔工艺对表面粗糙度、显微硬度分布、表面层残余应力分布以及显微组织变化的影响。结果表明:孔壁最大表面粗糙度Ra 0.431 μm,能很好满足航天工业对制孔粗糙度的要求;适当孔壁硬化(硬化程度为129%~141%)提高了耐磨性;表面层残余应力均为压应力,有利于提高孔的疲劳性能;由于散热良好和机械载荷小,孔壁表层并没有出现"白层"现象;因此,螺旋铣孔工艺能大大改善钛合金制孔表面完整性。<br>The influence of the processing parameters, including spindle rotational speed, tangential federate per tooth, and pitch on the surface integrity of hole in the helical milling process was studied. A series of orthogonal experiments in the helical milling process of TC4 titanium alloy were conducted, and the effect of the processing parameters on the surface roughness, micro-hardness distribution, residual stress distribution and microstructure evolution were studied with surface roughness tester, micro-hardness tester, X ray diffractometer, and metallographical microscope. The results revealed that the surface roughness of hole in the helical milled process can meet the requirement in aerospace industry with the maximum value of Ra 0.431μm; the proper work-hardening with hardening capability of 129%~141% can improve the abrasive resistance; the compressive residual stress can improve the fatigue performance; no "white layer" is found in the surface/subsurface of hole due to the favorable heat dissipation and the small mechanical load. Therefore, the helical milling technology can substantially improve the surface integrity of making-hole for TC4 titanium alloy
%K 螺旋铣孔工艺
%K TC4钛合金
%K X射线衍射
%K 表面完整性&lt
%K br&gt
%K design of experiments
%K heat losses
%K helical milling
%K metallography
%K microhardness
%K microstructure
%K milling(machining)
%K residual stresses
%K surface integrity
%K surface morphing
%K surface roughness
%K TC4 titanium alloy
%K titauium alloys
%K velocity
%K X-ray diffraction
%U http://journals.nwpu.edu.cn/jxkxyjs/CN/abstract/abstract5878.shtml