Feasibility study of the minimum quantity lubrication in high-speed end milling of NAK80 hardened steel by coated carbide tool
Resource
International Journal of Machine Tools and Manufacture 47 (11): 1667-1676
Journal
International Journal of Machine Tools and Manufacture
Journal Volume
47
Journal Issue
11
Pages
1667-1676
Date Issued
2007
Date
2007
Author(s)
Liao, Y.S.
Lin, H.M.
Chen, Y.C.
Abstract
High-speed milling of hardened steels generates high cutting temperature and leads to detrimental effects on tool life and workpiece surface finish. In this paper, feasibility study of the minimum quantity lubrication (MQL) in high-speed end milling of NAK80 hardened steel by coated carbide tool was undertaken. Flood cooling and dry cutting experiments were conducted also for comparison. It is found that cutting under flood cooling condition results in the shortest tool life due to severe thermal cracks while the use of MQL leads to the best performance. MQL is beneficial to tool life both in the lower speed cutting and the higher speed cutting conditions. A less viscous oil of MQL is essential in high cutting speed so that cooling effect can be effective. SEM micrograph of the insert shows that the use of MQL in high-speed cutting can delay welding of chips on the tool and hence prolongs tool life as compared with dry cutting condition. The application of MQL also improves machined surface finish in high-speed milling of die steels. © 2007 Elsevier Ltd. All rights reserved.
Subjects
Hardened steels; High-speed milling; Minimum quantity lubrication; Tool life
Other Subjects
Cracks; Cutting; Milling (machining); Steel; Thermal effects; Hardened steels; High-speed milling; Minimum quantity lubrication; Lubrication
Type
journal article
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