Surface Integrity and Tool Wear Analysis on Turning of Copper-Nickel 70/30 ASTM B122 Alloy under Low Initial Lubrication.

Enrique García-Martínez,Juana Coello,Valentín Miguel,Alberto Martínez-Martínez,María Carmen Manjabacas

doi:10.3390/ma14174868

Abstract

Traditional flood lubrication in machining processes is considered an unsustainable technique. In this paper, the low initial lubrication (LIL) technique is analysed during turning of cupronickel 70/30 alloy, in terms of surface roughness. A tribological analysis has been developed on a pin-on-disk tribometer comparing different lubrication systems, obtaining comparative results of friction and tool wear. It has been found that the tool wear is 73% lower in comparison to flood lubrication. LIL technique shows the ability to reduce the friction coefficient compared to dry machining and leads to improve tool wear in comparison with flood lubrication. The surface integrity evaluation of machined parts finds that the LIL technique can improve the surface roughness under specific machining conditions.

Highlights

The surface after machining processes becomes essential in alloys like Cu-Ni 70/30 due to its applications [1]
Figure coefficient of of friction (COF), under the three difdifferent lubrication conditions considered in this research
As was expected that the Ra -value would increase directly with the feed rate(c) under (a) As was (b) expected that the Ra-value would increase directly with the feed rate under any lubrication condition, which agrees with the theoretical relationship between Ra and any the lubrication condition, which (2))

Summary

Introduction

The surface after machining processes becomes essential in alloys like Cu-Ni 70/30 due to its applications [1]. During the turning process of Cu-Ni 70/30 alloy, long, ductile chips are formed, which causes a high temperature rise under dry machining conditions, making some kind of lubrication necessary Machining processes such as turning or milling have not been widely studied on Cu-Ni 70/30 alloy, making it necessary to dig deeper into the tribological characterization of the cutting process, as well as a complete analysis of the surface roughness of the machined part. Eder et al [3] have studied the temperature influence on the deformation behavior and subsurface alterations under dry sliding for some copper-nickel alloys They have found that the temperature plays an important role, indicating the importance of an efficient machining process for these alloys

Methods

Results

Conclusion