Abstract
This paper investigates the influence of dry high-speed milling on the surface quality of JIS SKD61 hard steel, compared to the conventional coolant fluid method. This research was conducted in a Super MC 500 high-speed CNC milling machine with a Hitachi coated carbide 20mm in diameter. High-speed cutting parameters such as cutting speed V, cutting depth t, and spindle speed S were considered as variants. The experiment was designed based on Taguchi's L9. Surface quality, including Ra and Rq, was measured using the Mitutoyo Surftest SV-210. A mathematical regression model was found for the average values of surface roughness through regression analysis for dry and coolant fluid conditions. The chosen high-speed milling parameters and the respective Ra and Rq values were obtained by ANOVA. The grey relation scores for wet and dry milling surface quality for cut depth, feed rate, and cutting speed were 0.7527, 0.7869, 0.6302, and 0.8167, 0.7199, 0.6040, respectively. The results showed that the feed rate had the greatest influence on the surface quality during the high-speed coolant milling of hardened steel, while the depth of the cut had the greatest influence on the surface quality during the high-speed dry milling process.
Highlights
JIS SKD61 alloy steel is a hot work mold steel, popular for its remarkable toughness, sufficient resistance to high-temperature fatigue, and high rigidity
The results show that the surface quality in dry is lower than in coolant fluid milling with the same cutting parameters
The results show that feed rate S and cutting speed V had the smallest S/N ratios in level 3 (-3.36, -2.92, respectively)
Summary
JIS SKD61 (or AISI H13) alloy steel is a hot work mold steel, popular for its remarkable toughness, sufficient resistance to high-temperature fatigue, and high rigidity. The manufacturing processes of extrusion die sets, hot forging, and casting dies include roughing, heat treatment, and machine finishing. The main effect of a coolant in milling is to reduce temperature and friction, prolong the life of the cutting tool, and improve the machining efficiency and surface quality [1,2,3]. The effect of the coolant fluid on machined surface quality and its performance in the high-speed machining of hardened steels has not been given attention and compared with dry milling under the same machining conditions
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Engineering, Technology & Applied Science Research
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
