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research-article

THE INFLUENCE OF CUTTNG FLUID CONCENTRATION AND FLOW RATE ON SURFACE ROUGHNESS AND MICROHARDNESS OF GROUND HARDENED STEELS

[+] Author and Article Information
Raphael Paiva

Federal University of Piauí, BrazilCampus Universitário Ministro Petrônio Portella, Ininga, Teresina - PI, Brazil
raphaellimap@hotmail.com

Rosemar Batista da Silva

Federal University of Piauí, BrazilAv. João Naves de Ávila, 2121 Santa Mônica Uberlândia - MG, Brazil
rosemar.silva@ufu.br

Mark J. Jackson

Kansas State University, Kansas, USAKansas State University, Polytechnic Campus, 2310 - Centennial Road - 67401-8196. Salina, KS. United States
mjjackson@ksu.edu

Alexandre M. Abrão

Universidade Federal de Minas Gerais, BrazilAv. Pres. Antônio Carlos, 6627 Pampulha Belo Horizonte - MG, Brazil
abrao@demec.ufmg.br

1Corresponding author.

ASME doi:10.1115/1.4038149 History: Received March 13, 2017; Revised October 05, 2017

Abstract

The application of cutting fluid in grinding operations is crucial to control temperature levels and prevent thermal damage to the workpiece. Water-based (emulsions and solutions) coolants are used in grinding operations owing to their excellent cooling capability and relatively lower cost compared to neat oils. However, the cutting fluid efficiency is not only dependent on its type, but also on other parameters including its concentration and flow rate. In this context, this work aims to analyse the influence of the coolant concentration and flow rate on the grinding process. Two different workpiece materials for the production of plastic injection moulds were machined: VP80 and VP ATLAS steel grades. Six grinding conditions (combinations of depth of cut values of 5, 15 and 25 µm with coolant concentration of 3 and 8%, respectively) were employed in the former, while two grinding conditions were used for the latter. The output parameter used to assess the influence of coolant concentration and flow rate on the grinding operation focused on the integrity of the workpiece materials (surface roughness and microhardness below the ground surface). The results showed that the surface integrity of VP80 after grinding was more sensitive to depth of cut than to cutting fluid concentration. Furthermore, the highest coolant concentration outperformed the lowest one when grinding under more severe conditions. With regard VP ATLAS steel, no influence of the coolant flow rate on surface roughness was observed.

Copyright (c) 2017 by ASME
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