| Summary: | 碩士 === 國立中正大學 === 機械系 === 88 === Abstract
Due to the enormous engineering advancement in modern industries, the competition in manufacturing technologies has been increasingly intense as can be seen in automobile and aeropspace industries .Nickel-based superalloys are widely in the manufacture of components for aircraft turbine engines for cryogenic tankage、liquid rockets 、reciprocating engines、space vehicles、heat-treating equipment、chemical and petro chemical industries because of their ability to retain high strength at elevated temperatures. But, because of its high strength 、poor thermal diffusion and work hardening, the cutting of Nickel-based superalloys results in the life of tools and efficiency of works for the worse ,which becomes much weaker than the other materials. AISI4340 are widely in the manufacture of components parts for gear、piston、automobile。
Therefore,in this paper,I would like to discuss about the Milling Machinability of Inconel-718 and AISI4340.By different cutting experiments on cutting speed,feed per tooth,and depth of cut,We can observe tools wear and surface roughness. The primary physical parameters governing the cutting process are (1)cutting peed(2)feed rate and (3)depth of cut. The perimental results show that, with increasing cutting speed, continu- ouschip production occurs. With increasing feed rate, the chip oduction rate is reduced. When cutting speed and feed rate are changed,the shape of the chipchanges. Depth of cut is not important to the shape of the chip. It was also found that when continuous chips occurs, the cutting force is lower and the machined surface becomes smooth. With higher cutting force and poor surface roughness, the chip rate is reduced. In turning, the production of continuous chips indicates a lower cutting force and a smooth finished surface.
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