Effect of CBN grain friability in hardened steel plunge grinding

Author(s)

Lopes, Jose Claudio ^[1] ; Fernandes, Lucas de Martini ^[1] ; Domingues, Bruno Biondo ^[1] ; Canarim, Rubens Chinali ^[1] ; Cindra Fonseca, Maria da Penha ^[2] ; de Angelo Sanchez, Luiz Eduardo ^[1] ; Moreira de Oliveira, Rodolfo Fischer ^[3] ; de Mello, Hamilton Jose ^[1] ; Aguiar, Paulo Roberto ^[1] ; Bianchi, Eduardo Carlos ^[1]

Affiliation

^[1] Sao Paulo State Univ Julio de Mesquita Filho, Dept Mech Engn, Bauru Campus, Sao Paulo - Brazil

^[2] Fed Univ Fluminense, Sch Mech Engn, Rio De Janeiro - Brazil

^[3] St Gobain, Dept Ceram Mat, Surface Conditioning, Sao Paulo - Brazil

• Document type: Journal article
• Source: INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY; v. 103, n. 1-4, p. 1567-1577, JUL 2019.
• Web of Science Citations: 4

Abstract

Nowadays, modern technology allows engineers to create tools with more adequate properties depending on the application. Currently, a lot of components require dimensional and geometric precision with tolerances increasingly tight. Grinding is the most suitable machining process in many cases and is currently applied in large scale in the machining business. Since it is a complex process due to its stochastic nature, there is a wide-open field of study and data collection to obtain the most efficient combination of tool/workpiece material depending on what is desired, always seeking improvements and optimization of the process. Besides this, a new parameter that can recently be considered to select the grinding wheel is the abrasive grains' friability level within cubic boron nitride (CBN) material. Since there is scarce information about the influence of this specific parameter in the performance of the wheel, this work aims to fill this gap. This work analyzes the cylindrical grinding of the AISI 4340 steel using two types of vitrified-bonded CBN grinding wheels. Their only significant distinction is the difference in the abrasive grains' friability. The performance of each wheel was analyzed taking into account the results obtained from the parameters' surface roughness, roundness error, micro hardness, acoustic emission, and average power. Regarding the average surface roughness, the more friable wheel produced values of 0.31, 0.40, 0.44, and 0.53 mu m, respectively, for the 0.25, 0.50, 0.75, and 1.00 mm/min feed rates. On the other hand, the average surface roughness values obtained from the workpieces ground with the less friable wheel were: 0.22, 0.29, 0.35, and 0.40 mu m, respectively, for the 0.25, 0.50, 0.75, and 1.00 mm/min feed rates. This means that when using the less friable abrasive grain, the surface roughness is better, which suggests that in the friability range analyzed, the use of a less friable wheel produces workpieces with better quality. (AU)

• FAPESP's process: 15/10460-4 - Analysis of the CBN grains friability in cylindrical grinding of nodular cast iron
• Grantee: Lucas de Martini Fernandes
• Support Opportunities: Scholarships in Brazil - Scientific Initiation