| Issue |
MATEC Web Conf.
Volume 188, 2018
5th International Conference of Engineering Against Failure (ICEAF-V 2018)
|
|
|---|---|---|
| Article Number | 04026 | |
| Number of page(s) | 8 | |
| Section | Design of Components and Engineering Elements, Coatings, Failure Analysis | |
| DOI | https://doi.org/10.1051/matecconf/201818804026 | |
| Published online | 07 August 2018 | |
Failure analysis of two cold-working cutting tools. Case studies
1
University of West Attika, Department of Mechanical Engineering,
250 Thivon & Petrou Ralli Ave.
12244
Egaleo,
Greece
2
University of West Attika, Department of Electrical and Electronics Engineering,
250 Thivon & Petrou Ralli Ave.
12244
Egaleo,
Greece
3
University of Leicester, IMPaCT C/O Department of Engineering General Office,
University Road,
LE1 7RH,
Leicester,
United Kingdom
Carmen Medrea: cmedtrea@puas.gr
The study examines the dramatic drop in the efficiency of a cutting tool. The specific tool is part of machine used for cutting envelopes of paper for medical products packaging. Two similar pieces, selected after breaking down in service, were examined in depth. Historical data was collected. The tool temperature range during operation and the material hardness were measured. The fracture surfaces as well as the surrounding areas were carefully inspected. Chemical analysis was performed in order to identify the tool and coating materials. Results showed that components were made of different steels: D2 and Vanadis 6. The coating material also differs. Samples were selected and prepared for optical and electron microscopy. The condition of the cutting edges and the heat-treated microstructure were considered. Thickness, quality and homogeneity of the coatings were also inspected. Both tools failed by fatigue mode under different conditions. The fracture mechanism and its principal causes are discussed. The reasons of failure for both cutting tools are examined and compared. Poor designs associated with improper handling have led to the components breakage. Appropriate recommendations are given in order to eliminate similar situations and to improve the cutting performance.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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