Diamondlike Carbon-Coated Dies for Deep Drawing of Aluminum Sheets
Author:
Murakawa M.1, Koga N.1, Takeuchi S.1
Affiliation:
1. Department of Mechanical Engineering, Nippon Institute of Technology, Saitama, Japan
Abstract
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.
Publisher
ASME International
Subject
Industrial and Manufacturing Engineering,Computer Science Applications,Mechanical Engineering,Control and Systems Engineering
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