TY - JOUR

T1 - Influence of the cutting edge preparation method on characteristics and performance of PVD coated carbide inserts in hard turning

AU - Denkena, B.

AU - Köhler, J.

AU - Breidenstein, B.

AU - Abrão, A. M.

AU - Ventura, C. E.H.

N1 - Funding information: The authors of the paper gratefully acknowledge the financial support received from CAPES (Brazilian Federal Agency for the Support and Evaluation of Graduate Education, Grant number BEX4202/10-4) .

PY - 2014/7/8

Y1 - 2014/7/8

N2 - The use of cemented tungsten carbide inserts in hard machining requires proper coatings and edge micro-geometries. A suitable choice of these factors enables the reduction of cutting forces, the increase of tool life and the improvement of workpiece surface quality. However, the effects of the edge preparation method and coating process on the substrate properties influence the performance of the insert during cutting. In this context, the influence of two different edge preparation methods (plunge-face grinding and brushing) on the performance of TiAlN-coated cemented tungsten carbide inserts during hard turning is investigated. In general, higher values of surface roughness (Rz ≅ 0.3. μm) and edge chipping (Rk ≅ 4.5. μm) were observed for brushed inserts in comparison to the ground tools (Rz ≅ 0.2. μm, Rk ≅ 3.7. μm). Moreover, higher compressive residual stresses are induced by brushing in comparison to grinding (≅ 500. MPa against ≅ 400. MPa). In turning tests, cutting forces for the ground inserts are approximately 10% higher than for the brushed inserts. However, higher wear values are better related to lower compressive residual stresses in the substrate than to higher cutting forces.

AB - The use of cemented tungsten carbide inserts in hard machining requires proper coatings and edge micro-geometries. A suitable choice of these factors enables the reduction of cutting forces, the increase of tool life and the improvement of workpiece surface quality. However, the effects of the edge preparation method and coating process on the substrate properties influence the performance of the insert during cutting. In this context, the influence of two different edge preparation methods (plunge-face grinding and brushing) on the performance of TiAlN-coated cemented tungsten carbide inserts during hard turning is investigated. In general, higher values of surface roughness (Rz ≅ 0.3. μm) and edge chipping (Rk ≅ 4.5. μm) were observed for brushed inserts in comparison to the ground tools (Rz ≅ 0.2. μm, Rk ≅ 3.7. μm). Moreover, higher compressive residual stresses are induced by brushing in comparison to grinding (≅ 500. MPa against ≅ 400. MPa). In turning tests, cutting forces for the ground inserts are approximately 10% higher than for the brushed inserts. However, higher wear values are better related to lower compressive residual stresses in the substrate than to higher cutting forces.

KW - Cemented tungsten carbide

KW - Cutting edge preparation

KW - Hard turning

KW - PVD-TiAlN coating

KW - Residual stress

UR - http://www.scopus.com/inward/record.url?scp=84905046724&partnerID=8YFLogxK

U2 - 10.1016/j.surfcoat.2014.07.003

DO - 10.1016/j.surfcoat.2014.07.003

M3 - Article

AN - SCOPUS:84905046724

VL - 254

SP - 447

EP - 454

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

SN - 0257-8972

ER -