Abstract
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.
Highlights
Compacted graphite iron (CGI) has been widely utilized for auto parts such as engine block and head because the higher mechanical and thermal loads in the engine are required for abating pollution [1]
The engine manufactured by CGI can provide higher power, lighter weight, thinner wall thickness, and the same elastic buffer compared with the grey cast iron (GI) engine
The results indicated that the increasing content of Ti in CGI could dramatically decrease the tool life
Summary
Compacted graphite iron (CGI) has been widely utilized for auto parts such as engine block and head because the higher mechanical and thermal loads in the engine are required for abating pollution [1]. The engine manufactured by CGI can provide higher power, lighter weight, thinner wall thickness, and the same elastic buffer compared with the grey cast iron (GI) engine. In contrast with the aluminum engine, the CGI engine have advantages on price, duration, vibration, noise, and energy consumption. Since CGI has higher tensile strength and lower thermal conductivity than GI, the cutting loads are relatively higher while machining CGI [2]. In the CGI machining process, it is very difficult to form the
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 callDisclaimer: 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.
