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Technologies 2017, 5(1), 3; doi:10.3390/technologies5010003

Tool Wear and Life Span Variations in Cold Forming Operations and Their Implications in Microforming

1
School of Engineering, Jönköping University, Jönköping 55111, Sweden
2
School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Singapore
3
Singapore Institute of Manufacturing Technology, Singapore 637772, Singapore
4
School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
*
Author to whom correspondence should be addressed.
Academic Editor: Manoj Gupta
Received: 4 November 2016 / Revised: 19 December 2016 / Accepted: 21 December 2016 / Published: 27 December 2016

Abstract

The current paper aims to review tooling life span, failure modes and models in cold microforming processes. As there is nearly no information available on tool-life for microforming the starting point was conventional cold forming. In cold forming common failures are (1) over stressing of the tool; (2) abrasive wear; (3) galling or adhesive wear, and (4) fatigue failure. The large variation in tool life observed in production and how to predict this was reviewed as this is important to the viability of microforming based on that the tooling cost takes a higher portion of the part cost. Anisotropic properties of the tool materials affect tool life span and depend on both the as-received and in-service conditions. It was concluded that preconditioning of the tool surface, and coating are important to control wear and fatigue. Properly managed, the detrimental effects from surface particles can be reduced. Under high stress low-cycle fatigue conditions, fatigue failure form internal microstructures and inclusions are common. To improve abrasive wear resistance larger carbides are commonly the solution which will have a negative impact on tooling life as these tend to be the root cause of fatigue failures. This has significant impact on cold microforming. View Full-Text
Keywords: fatigue; wear; life-span; modeling; prediction; tool material; microforming fatigue; wear; life-span; modeling; prediction; tool material; microforming
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Jarfors, A.E.W.; Castagne, S.J.; Danno, A.; Zhang, X. Tool Wear and Life Span Variations in Cold Forming Operations and Their Implications in Microforming. Technologies 2017, 5, 3.

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