Eventos Anais de eventos
COBEF 2017
Congresso Brasileiro de Engenharia de Fabricação
Turning of nickel super alloy VAT32 using carbide tools coated with Ti(C, N) + Al2O3 by CVD method and Ti-Al-Si-N by PVD method.
Submission Author:
Marcel Kondo , SP
Co-Authors:
Marcelo Antunes de Paula, Taise Azevedo de Sousa, Manoel Cleber de Sampaio Alves, Marcos Valério Ribeiro
Presenter: Marcel Kondo
doi://10.26678/ABCM.COBEF2017.COF2017-0567
Abstract
The nickel super alloy VAT32® was developed as substitute of UNS N07751 alloy in manufacturing of automotive internal combustion valves of high performance. The formation of niobium carbides gives to VAT32® super alloy a high wear resistance, desirable for application in automotive valves. This creates, however, a higher difficulty in machining this material. This paper studied the turning of VAT32® with two types of coated carbides tools, Ti(C,N) + Al2O3 by the process of chemical vapor deposition (CVD) and Ti-Al-Si-N by the process of physical vapor deposition (PVD). Was analyzed wear of the tools, the surface quality of machined parts and machining potency. The analyses were made using a Taguchi’s method of design of experiments, through L8 orthogonal array. The factors evaluated were cutting speed, tool feed, depth of cut and type of lubrication, dry and abundant lubrication. In turning with CVD tool, flank wear was influenced by cutting speed, tool feed and lubrication type used, been lowest values found in turning with cutting speed of 150 m/min, tool feed of 0.3 mm/rotation and abundant lubrication. Cutting speed, feed rate and type of lubrication also influenced the flank wear in turning with PVD tool, with the lowest values found in cutting speed of 90 m/min, feed 0.25 mm/rev and dry turning.
Keywords
CVD, PVD, tool wear, dry machining, Taguchi's method
