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Open AccessArticle

Investigation of Drilling Machinability of Compacted Graphite Iron under Dry and Minimum Quantity Lubrication (MQL)

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State Key Laboratory for Manufacturing System Engineering, Xi’an Jiaotong University, Xi’an 710054, China
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Key Lab. of NC Machine Tools and Integrated Manufacturing Equipment of the Education Ministry & Key Lab of Manufacturing Equipment of Shaanxi Province, Xi’an University of Technology, Xi’an 710048, China
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Mechanical Engineering Department, Istanbul Technical University, Istanbul 34437, Turkey
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Key Laboratory of Education Ministry for Modern Design and Rotor-Bearing System, Xi’an Jiaotong University, Xi’an 710049, China
*
Author to whom correspondence should be addressed.
Metals 2019, 9(10), 1095; https://doi.org/10.3390/met9101095
Received: 4 September 2019 / Revised: 5 October 2019 / Accepted: 8 October 2019 / Published: 11 October 2019
(This article belongs to the Special Issue Cast Irons: Properties and Applications)
Compacted graphite iron (CGI), which is used as a potential material in the auto industry, is a hard-to-machine material for the different minor elements and for the geometry of graphite with grey cast iron. The machinability of CGI in the drilling process was investigated with a 4-mm diameter fine-grain carbide twist drill under four lubrication conditions, dry (no compressed air), dry (with compressed air), MQL 5 ml/h, and MQL 20 mL/h in this paper. The maximum flank wear, types of wear, and cutting loads were studied for identifying the wear mechanism in drilling of CGI. The tool life in the four experiments of CGI drilling is 639 holes, 2969 holes, 2948 holes, and 2685 holes, respectively. The results showed that the main wear mechanism in drilling of CGI is adhesion and abrasion. Carbon, which originates from the graphite of CGI, can improve the lubrication in the drilling process by comparing with MnS in drilling grey cast iron. The thrust force and torque are more than 1000 N and 150 N*cm after 2700 holes in CGI drilling. Drilling of CGI under dry conditions (with compressed air) and MQL 5 ml/h is feasible.
Keywords: compacted graphite iron; minimum quantity lubrication (MQL); drilling machinability; dry machining compacted graphite iron; minimum quantity lubrication (MQL); drilling machinability; dry machining
MDPI and ACS Style

Li, Y.; Wu, W.; Kuzu, A.T.; Zhao, W.; Hong, J. Investigation of Drilling Machinability of Compacted Graphite Iron under Dry and Minimum Quantity Lubrication (MQL). Metals 2019, 9, 1095.

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