Optimised impregnation parameters of self-lubricating powder metallurgical components for cold bulk forming

authored by: Bernd Arno Behrens, Kai Brunotte, Dieter Bohr
Abstract: In order to achieve an economical forming technology production, a well-developed lubrication technology is generally required. Within the scope of this work, further investigations on a novel self-lubricating forming process are presented. Powder metallurgical (PM) components were impregnated with lubricant to store the oil in their process-related porosity. In a subsequent forming process the resulting pressure forces the oil to leak out lubricating the process. In preliminary works it was found, that the required maximum forming load can be reduced up to 39 % by applying the new lubrication method. In addition, relative densities up to 99 % were reached after deformation. Based on this, in this contribution optimized impregnation parameters regarding the initial porosity and impregnation time are presented. Compression tests were conducted and strain-stress-curves were recorded and analyzed. In addition, friction factors were determined in order to characterize the lubrication behavior. With the optimized parameters significantly higher strains and lower friction factors as compared to dry forming could be achieved.
Organisation(s): Institute of Metal Forming and Metal Forming Machines
Type: Conference contribution
Pages: 242-248
No. of pages: 7
Publication date: 2018
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Mechanics of Materials, Surfaces, Coatings and Films, Metals and Alloys
: Details in the research portal "Research@Leibniz University"

BibTeX

@inproceedings{57c547055efa4760ae5f73d025d2cb26,
title = "Optimised impregnation parameters of self-lubricating powder metallurgical components for cold bulk forming",
abstract = "In order to achieve an economical forming technology production, a well-developed lubrication technology is generally required. Within the scope of this work, further investigations on a novel self-lubricating forming process are presented. Powder metallurgical (PM) components were impregnated with lubricant to store the oil in their process-related porosity. In a subsequent forming process the resulting pressure forces the oil to leak out lubricating the process. In preliminary works it was found, that the required maximum forming load can be reduced up to 39 % by applying the new lubrication method. In addition, relative densities up to 99 % were reached after deformation. Based on this, in this contribution optimized impregnation parameters regarding the initial porosity and impregnation time are presented. Compression tests were conducted and strain-stress-curves were recorded and analyzed. In addition, friction factors were determined in order to characterize the lubrication behavior. With the optimized parameters significantly higher strains and lower friction factors as compared to dry forming could be achieved.",
keywords = "Powder metallurgy, Self-lubrication, Sintering, Upsetting",
author = "Behrens, {Bernd Arno} and Kai Brunotte and Dieter Bohr",
note = "Funding information: The presented results are based on the research project “Substitution of conventional mold lubrication by using self-lubricating raw parts in sinter forging”, Project number Be1691 184-1. The authors would like to thank the German Research Foundation (DFG) for the financial support.; 27th International Conference on Metallurgy and Materials, METAL 2018 ; Conference date: 23-05-2018 Through 25-05-2018",
year = "2018",
language = "English",
series = "METAL 2018 - 27th International Conference on Metallurgy and Materials, Conference Proceedings",
publisher = "TANGER Ltd.",
pages = "242--248",
booktitle = "METAL 2018 - 27th International Conference on Metallurgy and Materials, Conference Proceedings",
}