对使用磨损刀具在 PM 加工镍基超合金上钻孔进行精加工切入式端铣后的工件表面完整性和尺寸/几何精度进行评估

G.J. Deng , S.L. Soo , R. Hood , K. Marshall , A.L. Mantle , D. Novovic
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引用次数: 0

摘要

粉末冶金(PM)加工的镍基超合金由于具有更好的高温性能,越来越多地应用于燃气涡轮发动机的热部件,如高压(HP)压缩机和涡轮转子盘,而不是更传统的铸造和锻造选择,如铬镍铁合金(Inconel 718)。本文评估并比较了最初使用磨损刀具进行粗钻,随后在专有的 PM 加工镍基超合金上进行精加工切入式端铣的孔的表面完整性和几何/尺寸精度。此外,还研究了精加工切入式端铣后刀具磨损对孔质量的影响。与相应的粗钻孔相比,精加工后的孔质量明显改善,表面粗糙度(高达约 86%)、次表面显微硬度(高达约 125 HK0.05)和工件显微结构变形/损伤(平均深度高达约 80%)均有所降低。尽管表面粗糙度有所降低(~45-73%),但在使用磨损的切入式立铣刀加工的孔上仍可观察到颤振痕迹。总体而言,使用新刀具加工的孔表面完整性(表面下变形减少了约 47-64%)和几何精度(圆度减少了约 10-25%)都有所提高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Assessment of workpiece surface integrity and dimensional/geometrical accuracy following finish plunge end milling of holes drilled with worn tools in PM-processed nickel based superalloy

Powder metallurgy (PM) processed nickel-based superalloys are increasingly employed in the hot section of gas turbine engines for parts such as high-pressure (HP) compressors and turbine rotor discs over more traditional cast and wrought options such as Inconel 718 due to its improved high-temperature properties. In this paper, the surface integrity and geometrical/dimensional accuracy of holes initially rough drilled using worn tools and subsequently finish plunge end milled in a proprietary PM-processed Ni-based superalloy, were assessed and compared. The influence of tool wear on hole quality after finish plunge end milling was also investigated. Significant improvement in hole quality was evident following finishing with reductions in surface roughness (up to ~86%), subsurface microhardness (up to ~125 HK0.05) and workpiece microstructure deformation/damage (up to ~80% in terms of average depth) compared to corresponding rough drilled holes. Evidence of chatter marks on holes machined with worn plunge end mills was observed, despite exhibiting reduced surface roughness levels (~45-73%). Generally, somewhat improved hole surface integrity (reduced subsurface deformation by ~47-64%) and geometrical accuracy (circularity decreased by ~10-25%) were produced when employing new tools.

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