Wear behaviour of uncoated and diamond coated Si3N4 tools under severe turning conditions

• Type: Article in International Scientific Journal
• Date: 2007

Authors

Martinho, RP (Author) Other; Silva, FJG (Author) Other; Baptista, APM (Author) FEUP

Journal

Title: Wear

Vol. 263

Pages: 1417-1422

ISSN: 0043-1648

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 12 Citations

Scopus - 11 Citations

Scientific classification

FOS: Engineering and technology > Mechanical engineering

Other information

Authenticus ID: P-004-7J7

DOI: 10.1016/j.wear.2007.01.048

Abstract (EN): Ceramic tools with and without diamond coating were used as cutting material in continuous and dry turning operations of DIN GG25 grey cast iron. Nine combinations of speed (500, 600 and 900 m min(-1)) and feed (0.1, 0.25 and 0.4 turn rev(-1)) were used keeping the depth-of-cut constant and equal to I mm. The results show that the wear processes taking place in the tool tips of the ceramic inserts, in all cutting conditions, were both mechanical and chemical. The former was due to abrasion and adhesion, and the latter to a diffusion mechanism. However, this phenomenon was more obvious in the diamond coated inserts. A dynamometer and a data acquisition system were used to measure and record the cutting force developed during the turning tests. The worn cutting edges and rake surfaces were analysed by scanning electron microscopy (SEM) and the flank wear was measured by optical microscopy. The analysis of flank wear revealed that the tool life of diamond coated inserts is longer than that of the uncoated inserts. (c) 2007 Elsevier B.V. All rights reserved.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6