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Open AccessArticle

Experimental Study on the Effects of Coolants on Surface Quality and Mechanical Properties of Micromilled Thin-Walled Elgiloy

by Da Qu 1, Peng Zhang 1,*, Jiadai Xue 1, Yun Fan 2, Zuhui Chen 2 and Bo Wang 1,*
1
Centre for Precision Engineering, Harbin Institute of Technology, 92 West Dazhi Street, Nan Gang District, Harbin 150001, China
2
Manufacturing Department, 618 Flight Automatic Control Research Institute, 92 Dianziyi Road, Yanta District, Xi’an 710065, China
*
Authors to whom correspondence should be addressed.
Materials 2018, 11(9), 1497; https://doi.org/10.3390/ma11091497
Received: 29 July 2018 / Revised: 19 August 2018 / Accepted: 20 August 2018 / Published: 22 August 2018
In this study, minimum quantity coolant/lubrication (MQCL) is found to have significant impact on the surface quality and mechanical properties of the micromilled thin-walled work piece that is the core component of an aeroaccelerometer. Three kinds of coolants were used in the micromilling process to analyze their effects on surface quality and mechanical properties of the component. The experiment results show that an appropriate dynamic viscosity of coolant helps to improve surface roughness. The high evaporation rate of the coolants can enhance the cooling performance. Comparing with the dry machining case, MQCL has better performance on improving tool wear, surface quality, and mechanical properties of the micromilled work piece. It yielded up to 1.4–10.4% lower surface roughness compared with the dry machining case in this experiment. The machined work piece with the best mechanical properties and the one with the worst mechanical properties appeared in the ethyl alcohol and the dry machining case, respectively. The reasons for deteriorating surface quality and mechanical properties in dry machining cases are also analyzed. For improving the micromilling process, the penetration and cooling effect of the coolants are more important. This paper gives references to obtain better service performance of the component by improving the micromilling process. View Full-Text
Keywords: mechanical properties; tool wear; tensile test; micromilling; MQCL method; cooling effect mechanical properties; tool wear; tensile test; micromilling; MQCL method; cooling effect
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Qu, D.; Zhang, P.; Xue, J.; Fan, Y.; Chen, Z.; Wang, B. Experimental Study on the Effects of Coolants on Surface Quality and Mechanical Properties of Micromilled Thin-Walled Elgiloy. Materials 2018, 11, 1497.

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