Evaluation of friction using double cup and spike forging test for dry-in-place coating and forming oils. (October 2020)

• Record Type: Journal Article
• Authors: Kim, Jeong-Hun; Ko, Byung-Ho; Kim, Jae-Hong; Lee, Kyung-Hun; Moon, Young-Hoon; Ko, Dae-Cheol
• Is Part Of: Tribology international. Volume 150(2020)
• Publication Date: 2020-10
• Subjects: Dry-in-place coating -- Double cup test -- Spike forging test -- Claw pole's forging; Tribology -- Periodicals; 621.89
• DOI: 10.1016/j.triboint.2020.106361
• Languages: English
• ISSNs: 0301-679X

Abstract

Abstract: The friction characteristics of lubricants were evaluated using the double cup and spike forging tests. Friction calibration curves, i.e., plots of cup height ratio vs. punch stroke and spike height vs. punch stroke, were established through finite element (FE) simulations considering various friction factor values. The friction factor of the lubricants was determined by matching the relationships of the cup height ratio and spike height with the punch stroke obtained from experiments to those obtained from the FE simulations. Under the lubricating condition of dry-in-place coating with forming oil, the results showed that different tribo-testing methods yielded different friction factors. The friction factor determined was applied in the FE simulation of a cold forging process of a claw pole. Highlights: Tribo-testing methods under conditions of dry in-place coating and forming oils were performed. Friction factors determined from the tribo-testing methods were applied in a claw pole's forging process. Considering the hydrostatic effects, conformity of tribo-testing for cold forging process was evaluated.