B. de Agustina

Analysis of Cutting Forces during Dry Turning Processes of UNS A92024-T3 Aluminium Bars

In the aeronautical and aerospace industries there is a great demand of materials with high resistance and low weight such as the aluminium alloys for the production of different elements that conforms the airships and aerospace vehicles. In this work, an experimental study was carried out in order to analyse the influence of the cutting parameters (feed rate, cutting speed and type of tool) on the forces generated during dry turning tests of UNS A92024-T3 aluminium bars. The main influents factors on the forces were the feed rate and the interaction between type of tool and the spindle speed.

Analysis of the Machinability of Aluminium Alloys UNS A97050-T7 and UNS A92024-T3 during Short Dry Turning Tests

The aluminium alloys are widely employed in the aeronautical, aerospace and automotive industries in the most important manufacturing processes. This is due to the fact they have a high resistance even at high temperatures as well as a low density. Nevertheless, these materials can commonly show problems associated with the heat generated during the machining process that reduces their machinability. For this reason, cutting fluids are still widely used. However, the growing social preoccupation towards environmental conservation has made it necessary to develop cleaner production technologies as dry machining, in which no cutting fluids are employed. This situation makes necessary to look for combinations of cutting parameters and types of tools that improve the machining in those extreme work. In this study, the UNS A97050-T7 and UNS A92024-T3 aluminium alloys were analyzed in terms of surface roughness and the morphology of chips obtained, using tools with TiN coating. It was found that the surface quality of the aluminium UNS A97050-T7 and UNS A92024-T3 bars improves with the descent of the feed and with the increase of the cutting speed, being the feed the cutting parameter more influential on the surface roughness. Thus the machining of the UNS A92024-T3 allows obtaining shorter chips than the UNS A97050-T7.

Experimental Study Of Dry Turning Of UNS A92024‐T3 Aluminium Alloy Bars Based On Surface Roughness

The present work is based on a series of short tests (no longer than ten seconds) of dry turning. The tests have been made on cylindrical bars of UNS A92024‐T3 aluminium for different values of the cutting conditions (cutting speed and feed) and types of tools. Namely, two types of tools with identical geometry and different coatings (coated with TiN and uncoated) have been tried. The investigation is focused on analysing the relationship between the surface roughness of the bars obtained in the tests and the cutting parameters for both types of tools. A comparison between the results obtained for both tool coatings shows that, in general terms, the surface quality reached using coated tools is better than the obtained with uncoated ones. Considering the cutting parameters, the experimental results show that, with independence of the tool used, the lower the feed, the better the surface finish. Finally, taking into account the cutting speed, is possible conclude that the increase of the cutting speed when...

Roundness and Cylindricity Verification of Cylindrical Workpieces of Magnesium Alloys Obtained by Intermittent Dry Machining

Magnesium is the lightest metal used in industry, above all for aerospace and automotive applications where weight reduction allows an improvement in the fuel efficiency and reducing CO2 emission. In this work, an experimental study was carried out in order to determine with which machining process, turning or milling, are obtained cylindrical bars of magnesium alloy UNS M11917 by intermittent dry cut with improved roundness and cylindricity finish.

Principal Methods of Experimental Design and Statistical Analysis Used in Experimental Studies of Machining Processes

In practice, there are a lot of factors that can affect the expected final outcome of machining processes. That is why during last decades a great number of experimental studies have been made for improving this kind of processes. As the realization of the tests for taking into account factors such as machines, materials, tools and cutting conditions requires resources of different types and can provoke environmental damage at different levels, diverse methods of experimental design and statistical analysis have been developed looking for efficient experimentation. This paper is focused on the study of these statistical methods. It collects the principal types of experimental designs and statistical procedures used in experimental studies for the control and the improvement of machining processes. Additionally, the review and analysis of the main works on the machining processes area for each one of these statistical tools has been made.

Analysis Of The Surface Roughness Obtained During The Dry Turning Of UNS A97050‐T7 Aluminium Alloys

Currently, in the aeronautical, aerospace and automotive industries there is high demand of materials such as the aluminium alloys that have high resistance even at high temperatures as well as a low density. For this reason, these alloys are widely used for the production of different elements that compose aircraft and aerospace vehicles. Nevertheless, in spite of the important role these materials have from the competitive point of view, they can commonly show problems of machinability associated with the tool wear. That has made that traditionally cutting fluids had been used in machining processes. However, they can contain environmentally harmful constituents and increase considerably the total cost of the process. Therefore, researches have been focused on the development of cleaner production technologies applications as dry machining. This leads to the search for combinations of cutting parameters and type of tools (types of coatings and different geometries) that could improve the machining under...