On the Machinability of Aluminium and Aluminium Alloys

Abstract

The concept of machinability can be related to the facility of cutting of a specific material using a set of prefixed criteria depending on the manufacturing process. Because of this, the study of the machinability of a material requires the knowledge of a high number of parameters.Traditionally, the materials to be machined have been steels and cast ferrous alloys. A large number of studies on their machinability can be found in the literature in contrast to aluminium and its alloys, although in recent decades their industrial applications have increased considerably, especially in relation to the machining processes. The aim of this work is to assemble the few available data in the literature about the machinability of aluminium and aluminium alloys. These data have been structured and presented in order to systematize the machinability parameter study of aluminium alloys. in arbitrary units, values of magnitudes related to several properties versus the purity percentage of the metal. It can be observed that, while deficient properties are improved, the value of other properties decreases due to the addition of impurities. When selecting an aluminium alloy for an industrial application, an optimum balance among its properties must be sought. In this way, aluminium alloys are considered an effective solution for resolving manufacturing problems of mechanically resistant and hard-wearing elements because of its low weight-mechanical strength ratio, e.g., brake drums in the automotive industry, where gray cast is replaced by high mechanical strength and hard-wearing Al-Si alloys. Other instances can be found in the aerospace industry. One of the causes of the development reached by this industry can be related to the obtaining of work hardening aluminium alloys resistant to moderately high temperatures. On the other hand, aluminium alloys show good workability in casting /3/, forming /4/ and machining 151, as well as excellent behaviour against corrosion 161, high reflectivity, low emission power and unbeatable electrical and thermal conductivities 111. Owing to all this, aluminium and aluminium alloys are present in a wide range of industrial applications. In addition to the aforementioned industries, food, naval, electrical and others can be cited.00

Microstructural characterisation of material adhered over cutting tool in the dry machining of aerospace aluminium alloys

“…Because of this, cutting tool wear study is one of the most relevant analysis that can be made in order to reach a high degree of optimisation in a cutting process [1,2]. Different mechanisms can be the responsible of the tool wear in a determined cutting process [1][2][3]. Usually, those mechanisms do not act separately but, furthermore, their combination is multiplied sinergically [3].…”

“…Different mechanisms can be the responsible of the tool wear in a determined cutting process [1][2][3]. Usually, those mechanisms do not act separately but, furthermore, their combination is multiplied sinergically [3]. However, in order to know the importance of each mechanism, it is necessary to study each of them in a separate form.…”

“…This kind of tool wear can be produced by two different ways. On the one hand, direct adhesion wear is caused by the incorporation of tool particles to the chips by the action of the forces developed in the interface tool-machined material [3]. On the other hand, indirect adhesion wear is caused by the incorporation of fragment of the workpiece material to the tool [1,4].…”

Modelo paramétrico de la fuerza de corte para el torneado de la aleación AA2024

“…Un proceso de mecanizado está sujeto a un elevado número de variables, tanto de entrada (velocidad de corte, v, avance, a, profundidad de pasada, p, materiales, lubricación y refrigeración,...) como de salida (fuerza de corte, potencia específica, temperaturas de corte, vida de la herramienta,...) [1]. Una de las variables que puede proporcionar abundante información a la hora de evaluar uno de estos procesos es la fuerza de corte [1].…”

“…Una de las variables que puede proporcionar abundante información a la hora de evaluar uno de estos procesos es la fuerza de corte [1]. Este parámetro de salida depende de práctica-mente todos los parámetros de entrada, admitiéndose [2]: F = F (w 1 ,..., w q , v, a, p, t g1 ,..., t gp , t m1 ,..., t mr , LR, r 1 ,…,r n )…”