Parametric Model for Predicting Surface Finish of Machined UNS A92024 Alloy Bars

Abstract

In this work, a study on the dry turning process of UNS A92024 alloy has been carried out. This study has been achieved on the basis of the analysis of the surface finishing of the machined pieces in terms of roughness parameter, R a , as a function of cutting speed, v, and feed, f. The aim of this work has been devoted to establish R a =R a (v,f) parametric relations. Two steps have been followed in order to obtain these relations.Thus, in a first step, R a (v) and R a (f) potential curves have been fitted to experimental data using a linear fitting in the log-log plane. After this, in a second step, those curves have been treated as Bizier curves to construct a Coons surface R a (v,f). A mathematical expression of this surface has been obtained by fitting(v,f,R a ) experimental data to a combined R a (v,f) potential model. The obtained parametric relation can thus be used to predict the surface quality of the turned pieces when different values of cutting speed and feed are applied.

Experimental Parametric Model for Adhesion Wear Measurements in the Dry Turning of an AA2024 Alloy

“…The experimental results suggest that it is possible to obtain a potential parametric model of X = f(v c , f, a p ) with a better fit than other models. This was in accordance with the statistical treatment proposed for similar studies [ 27 , 50 , 51 ].…”

Cutting Speed-Feed Coupled Experimental Model for Geometric Deviations in the Dry Turning of UNS A97075 Al-Zn Alloys

“…Previous research has shown the limited influence of the cutting depth ( ) on GD obtained when these alloys are machined [34,37,51,59]. Due to this, its value remained constant in tests performed, with value of = 1 mm.…”

“…Potential models, similar to (1), usually show a good fit for aeronautical aluminum alloys. In this regard, some researchers suggest removing the cutting depth from (1), due to its small influence on Ra, in machining of UNS A92024 (Al-Cu) and UNS A97050 (Al-Zn) alloys [37,59].…”

Study of roundness on cylindrical bars turned of aluminium–copper alloys UNS A92024

“…Previously to performing the tests, the surface of the cylindrical workpieces were roughdressed by a high feed horizontal turning process in order to remove the surface deposits formed in the storing period. After this, a latter surface finishing small-feed turning process was carried out in order to avoid chattering effects on the workpiece surface [9].…”