Diamondlike Carbon-Coated Dies for Deep Drawing of Aluminum Sheets

[+] Author and Article Information
M. Murakawa, N. Koga, S. Takeuchi

Department of Mechanical Engineering, Nippon Institute of Technology, Saitama, Japan

J. Manuf. Sci. Eng 121(4), 674-678 (Nov 01, 1999) (5 pages) doi:10.1115/1.2833101 History: Received July 01, 1997; Revised June 01, 1998; Online January 17, 2008


Soft and hard diamondlike carbon die coatings were used to deep draw aluminum sheets with a very light and environment-friendly water-soluble oil lubricant and even without a lubricant. The water-soluble oil lubricant with poor lubrication ability caused premature rupture of the aluminum blank when drawn with a noncoated steel die, whereas a die coated with soft diamondlike carbon (WC/C) had a lifetime of over 7000 drawing operations. A cost-effective die could be made of a die steel body on which a sintered tungsten carbide alloy overlayer was deposited by high-velocity thermal spraying and further coated with a hard diamondlike carbon (DLC), which gave a life of up to 6000 operations even without a lubricant. Tool life was almost equal to that for a solid sintered carbide alloy die coated with DLC.

Copyright © 1999 by The American Society of Mechanical Engineers
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