Inconel 718 and Waspaloy, Nickel-based super-heat-resistant alloy, are high-strength, thermal-resistant and corrosion-resistant alloy that are widely used in parts of gas turbines and airplane engines. Due to their ex...Inconel 718 and Waspaloy, Nickel-based super-heat-resistant alloy, are high-strength, thermal-resistant and corrosion-resistant alloy that are widely used in parts of gas turbines and airplane engines. Due to their extremely tough and thermal-resistant nature, they are well known as materials that are difficult to cut. Shape holes on a disc of an aircraft engine, made of Ni-based super-heat-resistant alloy, are required with good surface integrity and geometric accuracy. This kind of shape hole is produced by EDM (Electro-discharge machining) currently. It is necessary to investigate an alternative machining process to reduce the process time and improve the surface quality. This paper presents an experimental study on the machining methods for the shape hole of Ni-base super-heat-resistant alloy Inconel 718 and Waspaloy. The feasibility using milling or/and grinding as an alternative for currently EDM process to machine shape holes is assessed by observing the wear and breakage of the cutting tools and grinder and analyzing the hole surface integrity and geometric accuracy. The results show that the milling process of Inconel 718 and Waspaloy can produce shape holes with acceptable surface roughness and geometric accuracy efficiently. The machined Waspaloy shape holes reveal a slight decrease tendency in section dimension from the top of the its bottom. There is a larger deviation from the nominal profile at the segment with smaller radius. A thin softened surface layer with thickness smaller than 60 μm occurs on the machined Waspaloy shape holes. The softening and work hardening become remarkable with the progress of tool wear.展开更多
文章介绍用常规粉末冶金方法制备添加纳米 Ti N的 Ti C-10 Ti N-16 Mo-5 Co-5 N i-1C系金属陶瓷刀具 ,通过较系统的切削试验 ,研究了此种金属陶瓷刀具在切削正火态 45 #钢时的切削性能及磨损机理。结果表明 ,金属陶瓷刀具适用于较高速...文章介绍用常规粉末冶金方法制备添加纳米 Ti N的 Ti C-10 Ti N-16 Mo-5 Co-5 N i-1C系金属陶瓷刀具 ,通过较系统的切削试验 ,研究了此种金属陶瓷刀具在切削正火态 45 #钢时的切削性能及磨损机理。结果表明 ,金属陶瓷刀具适用于较高速度下的切削 ,其切削速度 vc、进刀量 f对刀具后刀面磨损量的影响较大 ,而切削深度 ap对刀具的磨损影响较小 ,刀具的失效形式主要是磨损。展开更多
文摘Inconel 718 and Waspaloy, Nickel-based super-heat-resistant alloy, are high-strength, thermal-resistant and corrosion-resistant alloy that are widely used in parts of gas turbines and airplane engines. Due to their extremely tough and thermal-resistant nature, they are well known as materials that are difficult to cut. Shape holes on a disc of an aircraft engine, made of Ni-based super-heat-resistant alloy, are required with good surface integrity and geometric accuracy. This kind of shape hole is produced by EDM (Electro-discharge machining) currently. It is necessary to investigate an alternative machining process to reduce the process time and improve the surface quality. This paper presents an experimental study on the machining methods for the shape hole of Ni-base super-heat-resistant alloy Inconel 718 and Waspaloy. The feasibility using milling or/and grinding as an alternative for currently EDM process to machine shape holes is assessed by observing the wear and breakage of the cutting tools and grinder and analyzing the hole surface integrity and geometric accuracy. The results show that the milling process of Inconel 718 and Waspaloy can produce shape holes with acceptable surface roughness and geometric accuracy efficiently. The machined Waspaloy shape holes reveal a slight decrease tendency in section dimension from the top of the its bottom. There is a larger deviation from the nominal profile at the segment with smaller radius. A thin softened surface layer with thickness smaller than 60 μm occurs on the machined Waspaloy shape holes. The softening and work hardening become remarkable with the progress of tool wear.
