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ISSN Print: 2381-1072 ISSN Online: 2381-1080

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Surface Layer Analysis of Hot-Forging Dies After Die-Sinking Electrical Discharge Machining Using Copper and Titanium Electrodes

Engineering and Technology
Vol.4 , No. 6, Publication Date: Oct. 17, 2017, Page: 70-75

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Authors

[1]	Phan_Nguyen Huu, Faculty of Mechanical Engineering, Hanoi University of Industry, Ha Noi, Vietnam.
[2]	Dong_Pham Van, Faculty of Mechanical Engineering, Hanoi University of Industry, Ha Noi, Vietnam.
[3]	Son_Phung Xuan, Faculty of Mechanical Engineering, Hanoi University of Industry, Ha Noi, Vietnam.

Abstract

Electrical discharge machining (EDM) is a popular unconventional method for manufacturing tools, molds, and dies. Currently, the surface layer of the hot die after EDM needed to be polished to remove the layer of  50 m. This research is aimed at the investigation of performance and structure of the surface layer in hot-forging die following die-sinking EDM. The machining conditions included the use of copper (Cu) and titanium (Ti) as electrode materials. A cross-sectional micrographic and hardness analysis was performed, as well as surface roughness measurements, in order to research the thermally affected zones of the hot-forging die surface layer of the SKD61 steel after EDM using oil as the dielectric fluid. The results showed that the performance of the die was reduced due to changes in the hardness and the chemical composition of the workpiece surface. The surface quality of hot-forging die after EDM with Ti or Cu electrode are similar. In this case, EDM using Ti electrode to improve the quality of hot die surface layer was unreasonable. And future trends of hot-forging die surface layers’s modiﬁcation has also been introduced.

Keywords

EDM, Surface Roughness, Microscopic Hardness, Titanium, Copper

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