Eventos Anais de eventos
COBEF 2023
12th Brazilian Congress on Manufacturing Engineering
A comprehensive review on cutting fluids on micromachining operations
Submission Author:
Déborah de Oliveira , DF , Brazil
Co-Authors:
Déborah de Oliveira, Milla Caroline Gomes, Aline Gonçalves dos Santos, Reginaldo Coelho, Wayne Nguyen Phu Hung, Marcio Bacci Da Silva
Presenter: Déborah de Oliveira
doi://10.26678/ABCM.COBEF2023.COF23-0527
Abstract
Micromachining does not have a single definition, it can be characterized by the uncut chip thickness, tool size and/or the size of the part that is being machined. However, the so called size effect is a characteristic of micromachining operation that is unanimity in the literature. This is characterized by a nonlinear increase in the specific energy, caused by the similar sizes of the tool cutting edge radius and the material microstructure. Differently from macro machining, the tool cutting edge radius is large, and the tool cannot be considered perfectly sharp. These characteristics lead the micro cut to have high plowing, excessive burr formation, adhered material in the cutting edge and high tool wear. The use of cutting fluids can hinder these difficulties, once it favors the chip formation and allows better surface finish and lower wear rates. In this sense, this work aims to present a literature review on the use of cutting fluids on micromachining operation. Different cooling-lubricant atmospheres will be compared, namely: dry, flood, cryogenic and minimum quantity of lubrication (MQL). After analyzing the literature, it could be observed that dry micromilling usually presented the worse results favoring BUE formation and slots poor finishing, however, regarding the tool wear, it can enhance or reduce the tool life if it is stable or non-stable, respectively. The use of flood, in general, presents results intermediate between dry and MQL. The MQL stands out demonstrating to be the best methodology for micromilling metals, resulting in better surface finishing, less adhered material, lower surface roughness values and smaller burrs. In some of the studies MQL could also increase tool life. Cryogenic methodologies, on the other hand, are usually applied in high ductility materials, highlighting the polymers. The method stands out for allowing good surface finishing, higher dimensional accuracy, and reduced burr formation.
Keywords
Micromachining, MQL, Flood, cryogenics, surface finishing
