Title: Microstructure and performance of self-lubrication CBN grinding wheels

Authors: Wenfeng Ding; Jiuhua Xu; Zhenzhen Chen; Changyong Yang; Honghua Su; Yucan Fu

Addresses: College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, 210016, China. ' College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, 210016, China. ' College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, 210016, China. ' College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, 210016, China. ' College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, 210016, China. ' College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, Jiangsu, 210016, China

Abstract: Cu-Sn-Ti alloy, CBN grains and graphite particles were mixed, moulded and sintered to prepare the self-lubrication CBN abrasive composite blocks and grinding wheels. The mechanical strength of the composite blocks was measured. The fracture morphology and the interfacial microstructure of blocks were characterised. Dressing experiments were conducted. The graphite film was observed on the working surface. Finally, the grinding temperature of self-lubrication CBN grinding wheel was compared with that of the vitrified counterpart. The obtained results show that the bending strength of the composite blocks reaches 116 MPa in case of 5 wt.% graphite particles. Chemical joining has happened within the interface of CBN/Cu-Sn-Ti and graphite/Cu-Sn-Ti. Graphite film has been formed successfully and spread to the working layer surface after dressing. The grinding temperature of the self-lubrication CBN wheel is lower than that of the vitrified counterparts. All this indicates the potential of the graphite self-lubrication CBN grinding wheels in machining difficult-to-cut materials.

Keywords: self-lubrication; graphite particles; interfacial microstructure; CBN grains; graphite film; CBN grinding wheels; fracture morphology; wheel dressing; grinding temperature; bending strength; abrasive composite blocks; titanium alloys.

DOI: 10.1504/IJAT.2012.046817

International Journal of Abrasive Technology, 2012 Vol.5 No.1, pp.62 - 71

Received: 19 Nov 2011
Accepted: 28 Dec 2011

Published online: 30 Jul 2014 *

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