USINAGEM: definição da pastilha de corte ideal utilizada em uma fresadora de sedes de válvulas

Abstract

The work was developed from a bibliographic study followed by a case study. The objective of this work is to define the ideal cutting insert used in a valve seat milling machine where the insert was not able to complete the machining of valve seats of greater hardness, presenting roughness on the surface and with that problem in the sealing. The wear of valve seats is common and frequent and is related to material losses due to the rotary movement and the pressure exerted by the spring that constitute the set, these movements lead to degradation and consequently loss of sealing in the combustion chamber, compromising the parameters in the combustion of the engine, decreasing its performance and changing the sealing of the combustion chamber. Total sealing is extremely important so that the ideal pressure for combustion can be established and they are one of the important components for homogeneous burning, reducing the rate of emission of pollutants into the atmosphere. Tests were carried out between three types of cutting insert on different types of valve seats with different hardness and speed. The objective was achieved, with results collected from the tests, we can conclude that the T3 insert presented the best performance in the tests performed.