An experimental study of the effect of back rake angle in rock cutting. (July 2018)

• Record Type: Journal Article
• Authors: Rostamsowlat, Iman; Richard, Thomas; Evans, Brian
• Is Part Of: International journal of rock mechanics and mining sciences. Volume 107(2018)
• Page Start: 224
• Page End: 232
• Publication Date: 2018-07
• Subjects: Rock cutting -- Back rake angle -- Intrinsic specific energy -- Interfacial friction angle -- PDC cutter; Rock mechanics -- Periodicals; Soil mechanics -- Periodicals; Mining engineering -- Periodicals; Roches, Mécanique des -- Périodiques; Sols, Mécanique des -- Périodiques; Technique minière -- Périodiques; 624.151305
• DOI: 10.1016/j.ijrmms.2018.04.046
• Languages: English
• ISSNs: 1365-1609

Abstract

Abstract: The objective of this paper is to investigate the influence of the rake angle on the magnitude of the intrinsic specific energy and the inclination of the force acting on the cutting face of a Polycrystalline Diamond Compact (PDC) sharp cutter while tracing a groove on the surface of a rock sample. An extensive and comprehensive set of cutting experiments was performed on a wide range of quarry rock samples using a state of the art rock cutting equipment (Wombat). The results conform with the previous studies by other researchers; the intrinsic specific energy is in good agreement with the uni-axial compressive strength of the rock samples when the cutter is positioned at back rake angles between 5° to 20°. New results on a few rock samples were also obtained by performing novel experimental tests at very large rake angles ( θ > 70 ° ) as well as negative rake angles, showing that the intrinsic specific energy increases dramatically once the back rake angle exceeds 75°. Results also indicate that the decrease of the apparent interfacial friction angle with increasing back rake angle seems to follow a "universal trend" weakly dependent on the rock sample. Abstract : Highlights: A campaign of extensive cutting experiments was performed with a sharp cutter on thirteen different quarry rocks at different back rake angles ranging from −10° to 85°. Intrinsic specific energy increases dramatically once the back rake angle exceeds 75°. Increase of the back rake angle leads to a decrease in the apparent interfacial friction angle and an increase in intrinsic specific energy. These trends seem to follow a "universal law" independent of rock being tested.