Research on Tribological Characteristics of Hard Metal WC-Co Tools with TiAlN and CrN PVD Coatings for Processing Solid Oak Wood

Deividas Kazlauskas,Vytenis Jankauskas,Simona Tučkutė

doi:10.3390/coatings10070632

Deividas Kazlauskas, Vytenis Jankauskas + Show 1 more

Open Access

https://doi.org/10.3390/coatings10070632

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Journal: Coatings	Publication Date: Jun 30, 2020
Citations: 12	License type: CC BY 4.0

Affiliation: Vytautas Magnus University, Lithuanian Energy Institute

Abstract

The article presents research results that demonstrate the impacts of mechanical and tribological characteristics on the efficiency of cutting tools made from hard metal WC-Co. Uncoated tools and tools coated with physical vapor deposition (PVD) coatings (CrN and TiAlN) were tested. The thickness of coatings was determined, and tests of roughness, microhardness, and adhesion were performed. The coefficient of friction (COF) was established by different methods, and the wear of the tested cutters which occurs during the milling of solid oak wood, and the impact of this on surface roughness, were determined. The results revealed that uncoated WC-Co cutters are the least resistant to wear, while cutters coated with chromium nitride (CrN) are the most resistant. Both PVD coatings were damaged in the 9050 m in area of the cutting edge.

Highlights

The turnover of the wood industry in the European Union in 2010–2011 exceeded 122 billion euros [1], and the amount of wood processed in the EU grew from 3.8 ×108 to 4.9 × 10 8 m3 from 2009 to 2018 [2]
Cutting tools are subjected to large mechanical and thermal loads, plastic deformation, adhesive and diffusive wear, and oxidation [5,6,7,8,9]. Their efficiency depends on their resistance to mechanical loads, the stability of their physical and chemical characteristics, their structure, and the characteristics of their superficial layers [10,11]
The surface grinding trace with the cutting edge formed an angle δ of about 10◦. These samples were coated with a 2-μm-thick physical vapor deposition (PVD) layer (CrN and TiAlN) by Cemecon

Summary

Introduction

The turnover of the wood industry in the European Union in 2010–2011 exceeded 122 billion euros [1], and the amount of wood processed in the EU grew from 3.8 ×108 to 4.9 × 10 8 m3 from 2009 to 2018 [2]. The cutting of wood and its materials is a complex process [3]. Cutting tools are subjected to large mechanical and thermal loads, plastic deformation, adhesive and diffusive wear, and oxidation [5,6,7,8,9]. Their efficiency depends on their resistance to mechanical loads, the stability of their physical and chemical characteristics, their structure, and the characteristics of their superficial layers [10,11]

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