Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
PERFORMANCE OF THE TOOL FOR TAPPING WITH AND WITHOUT TRIBOLOGICAL COATING IN MACHINING OF CRANKSHAFT
Submission Author:
Laura Uchôas Stumpf , MG
Co-Authors:
Laura Uchôas Stumpf, Josue Santos, Jose Rubens Gonçalves Carneiro
Presenter: Laura Uchôas Stumpf
doi://10.26678/ABCM.COBEM2019.COB2019-1155
Abstract
The increase of the cutting tool life in machining process has been challenging to process engineers. This article was developed with the main goal of compare the performance of the tools for tapping (taps) with and without tribological coating in the process of tapping the crankshaft. For this, it was evaluated the high speed steel HSS (substrate) produced by powder metallurgy and coated of titanium nitride – TiN coatings, titanium carbonitride - TiCN. It has been tested WC-Co tool. Preliminary tests were realized to prove the efficiency of WC-Co,that showed a productivity slightly higher than 5 times the productivity HSS tappings. It has also been proven that the greatest wear has been concentrated on the third taper of the tool, and also that the parallel threads have as function the calibration of the internal thread. The wear of the conical fillets was evaluated by the relation between the worn area and the total area of the fillet, which allowed to follow the process of wear of the tapping and to prevent the fracture of the taps. It was observed that wear mechanism of taps was abrasive and coating thickness decreased after pieces manufacturing to coated taps TiN /TiC.
Keywords
machining, Tapping, Tribological coating, Wear
