Analysis of the influence of tool geometry and mo equivalent on cutting forces of high strength titanium alloys

Abstract

Consulta en la Biblioteca ETSI Industriales (Riunet)

[EN] This project relates to the second part of a PhD thesis carried out by Dr. Peter Crawforth of the Advanced Manufacturing Research Centre ( gAMRC h) at the University of Sheffield, England, UK. While being not only an important centre of research in aerospace within Europe, AMRC is also important within the fields of machining and modelling. In his thesis, Crawforth reaches the conclusion that tool geometry is an important factor which has an influence on cutting forces which can affect chip width, resistance and mechanical and thermal stress. In drawing upon that thesis, this project: explores Crawforth fs thesis in further depth, and; analyses how composition can affect the machining process, particularly in the context of the steady state of force-- ]time graphs. It is hoped that as a consequence of this project we will be able to further understand the mechanism by which we can produce the cutting of materials until it reaches a permanent state. To that end, particular materials have been studied, such as titanium, and 11 tests have been carried out. Within those 11 tests, 5 were completed using the same roundness tips with the remaining 6 being varied. The methodology employed during the above trials was as follows: (1) Using orthogonal cutting, including the preparation of the bills (as explained at Part 5); (2) Applying a low band pass filter to all the graphs to avoid noise and plotting of graphs force-- ]effective federate; (3) Calculating the gMo Equivalent number h of each material and analysing any relation between it and the cutting forces, gradient of the line during steady state, and roundness values, and; (4) Recording and looking for and correlation between the chip width, wear and tear of the tool, beta trans temperature, young modulus and final stress.