Effect of Rake Face Reinforcement on Cutting Tool Life of Cemented Carbide Tools during Turning of a-Titanium Alloy
Keywords:
cemented carbide, cutting operation, titanium alloys, contact flow process, Russia standard (GOST)Abstract
This study analysed the wear mechanism of different cemented carbide tool and the effect of reinforcing the rake face of the best wear resistant cemented carbide tool during the turning of a-titanium alloys as a means of determining the most appropriate cutting tool and optimum tool geometry for the cutting operation. Three titanium alloys: BTJ.00, BT3-1 and BT-5.1 were used as the work piece materials. The cutting tools used are cemented carbide tools BK8, BK6, BK60M, BKJ00M, BKJ0X0M, T5KJ0 and Tl5K6. The cemented carbide tools come under the Russia standard (GOST). The cutting operations were carried out dry for the three work piece materials used. Cutting conditions chosen are; cutting speed, v, between 40-60m/min; cutting feed, s, 0.3mm/rev; and cutting depth, t, 1.5mm. The peculiarity of contact flow process and the wear tendency of the cemented carbide tools account for the necessity to reinforce the rake face with a negative fascia. In respect of this, the fascia has the following parameters: rake face=00, supporting fascia= -150, width of supporting fascia= 0.20-0.25mm. Results of the experiment helps to determine the optimum cutting speed and parameters of type of tool materials that suit different types of production.
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