Authors: Paulo Rosa Da Mota, Rafael Ariza Goncalves, Alexandre Martins Reis, Marcio Bacci Da Silva
Addresses: Federal Centre for Technological Education, Rua 75, 46, Setor Central, Goiania/GO 74055-110, Brazil. ' Faculty of Mechanical Engineering, Federal University of Uberlandia, Campus Santa Monica, Uberlandia 38400-089, Brazil. ' Federal University of Vicosa, Campus Universitario UFV, 36570-000, Vicosa/MG, Brazil. ' Faculty of Mechanical Engineering, Federal University of Uberlandia, Campus Santa Monica, Uberlandia 38400-089, Brazil
Abstract: The main goal of this paper is the evaluation of the performance of high-speed steel taps when machining grey cast iron at high cutting speeds. It is used for two types of high-speed steel, one with addition of vanadium (HSS-E) obtained by conventional method, classified as AISI M3 and other obtained by powder metallurgy (HSS-PM), classified as AISI M7. These two tool materials are used in two coated situation: with TiN and multilayer TiN-TiNAl. The tests were carried out at two different cutting speeds, 37.5 and 75 m/min. The tool life criteria were based on dimensional tolerances of the threads, on tool wear and also on catastrophic failure of the tool. Analysis in the Scanning Electron Microscope (SEM) and optical microscope were done to determine the type and mechanisms of wear. The results showed that the effect of the cutting speed depends on the coating. The best performance was achieved with the multilayer coating TiN-TiNAl.
Keywords: tapping; high speed machining; high speed steels; high speed cutting; steel taps; grey cast iron; tool life; toole wear; tool failure; tool coatings.
International Journal of Machining and Machinability of Materials, 2007 Vol.2 No.2, pp.299 - 308
Published online: 28 May 2007 *Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article