International Journal on Advanced Science, Engineering and Information Technology, Vol. 10 (2020) No. 5, pages: 1954-1962, DOI:10.18517/ijaseit.10.5.13336

Experimental Study on Impact of Thermal-Assisted Machining on SKD11 Steel Machinability

Long Vuong Hoang, Hoai Nhan Nguyen, Thanh Hai Truong, A. Rahman M. S Al-Tawaha, Huu Cuong Le

Abstract

Machining in a heated environment has been used in pressure machining and metal cutting. Thermal-assisted machining is a new machining method performed on conventional machine tools, CNC machines, in which the workpiece is heated before machining. Different heat sources do the thermal-assisted: electrical energy, laser beam, magnetic induction. However, there is very little research on thermal-assisted machining when milling SKD11 steel, a difficult-in-processing material but widely used in the industry. Material machinability refers to the ability of material machining that is difficult or easy. Material machinability is measured by tool life, material removal ability, shear force, cutting vibration, surface roughness. The material's machinability is directly influenced by its microscopic structure and is related to the cutting mode. This paper has highlighted the study of material machinability when thermal-assisted machining and compared to the conventional one. This study also highlights the crucial role in assessing the effect of heating on the SKD11 steel machinability. This study analyzed the technological parameters' role on the shear force, chip shrinkage, surface roughness, and shear vibrations during normal machining and SKD11 steel heating. The study results showed that the material's microstructure and the amplitude of vibration did not change under the heating process's effect with a temperature range of 200oC - 400oC. However, the shearing force during heat processing is drastically reduced compared to conventional machining. Chip shrinkage increased by 31.7% when heated to 400oC, while roughness decreased by 47.1%.

Keywords:

thermal-assisted machining; SKD11 steel; material machinability; microstructure; milling machine.

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