Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
ASSESSMENT OF LUBRICOOLING METHODS ON TOOL LIFE AND SURFACE ROUGHNESS IN ASTM A182 F55 SUPER DUPLEX STAINLESS STEEL TURNING
Submission Author:
Gabriel Pinto , RS
Co-Authors:
Lourenço Miranda, Gabriel Pinto, Diógenes Barbosa Teles, André João de Souza
Presenter: Gabriel Pinto
doi://10.26678/ABCM.COBEM2023.COB2023-1746
Abstract
Excellent mechanical properties combined with high temperature and corrosion resistance make the super duplex stainless steel appropriate for applications in the oil & gas industry, components and equipment implanted in corrosive environments, and other critical operating conditions. However, the properties that, on the one hand, make the use of this material attractive, on the other hand, make the machining of its components difficult, requiring further studies. Due to the growing trend towards environmentally friendly machining, alternative lubrication-cooling techniques have been employed. Thus, this work aims to investigate the effect of applying minimal quantity lubrication (MQL) and dry cutting, compared to the wet machining, on the PVD-TiAlSiN coated carbide tool life during the semi-finishing turning of the ASTM A182 F55 super duplex stainless steel. For this, two levels of cutting speed were used (80 and 120 m/min), while the feed rate (0.1 mm/rev) and depth of cut (1.0 mm) were kept constant. The behavior of the average roughness (Ra) of the machined surface was also evaluated during the tool life tests. A longer tool life was noted for all lubricooling methods for the lowest cutting speed (80 m/min). However, this improvement in tool life was not enough to increase the volume of material removed under DRY and MQL conditions. Thus, for these lubricooling conditions, the highest cutting speed (120 m/min) can result in higher productivity. Despite presenting intermediate performance in tool life for both cutting speeds (which is positive from an environmental point of view), the highest Ra values were produced in dry turning, which can be explained by the absence of lubrication. For both cutting speeds, wet machining resulted in an intermediate surface finish but generated a lower tool life due to the greater work hardening of the material in this condition. The MQL promoted higher tool life and lower Ra values compared to other addressed lubricooling techniques, regardless of the cutting speed level used, thus guaranteeing advantages from the environmental and productivity points of view.
Keywords
Turning, Minimum Quantity of Lubrication, Super-duplex Stainless Steel, Tool life, Average Roughness
