High effective laser assisted diamond turning of binderless tungsten carbide

• Published in: Journal of materials processing technology Vol. 302; p. 117505
• Main Authors: You, Kaiyuan, Fang, Fengzhou
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.04.2022; Elsevier BV
• Subjects: Brittle materials; Brittleness; Constitutive model; Constitutive models; Diamond machining; Diamond tools; Diamond turning; Finite element method; Graphitization; High temperature; Laser assisted machining; Laser beam heating; Lasers; Mathematical models; Nanoindentation; Process parameters; Rake faces; Residual stress; Surface finish; Thermal field; Thermomechanical analysis; Tool life; Tungsten carbide; Turning (machining); Workpieces; Laser assisted machining; Constitutive model; Thermal field; Diamond turning
• ISSN: 0924-0136; 1873-4774
• DOI: 10.1016/j.jmatprotec.2022.117505

[Display omitted] Laser assisted diamond turning is a potential approach to increase the surface finish quality on the hard and brittle materials and to improve diamond tool life. A high effective laser assisted turning (HE-LAT) method is proposed in this article, which guides the laser beam refracts at rake face, cutting edge, and total reflects at flank face. The HE-LAT method possesses effectively improved laser heating efficiency and can be employed to achieve the homogeneous optical surfaces on hard and brittle materials. The theoretical thermomechanical analysis and systematical experimental investigations are conducted to optimize the machining parameters of the proposed HE-LAT method. The nanoscale constitutive model of binderless WC has been obtained based on the high-temperature nanoindentation tests, which facilitates the workpiece thermal filed prediction cooperating with the relevant HE-LAT FEA model. The experimental results indicate that the HE-LAT method can help to eliminate the surface fluctuation effectively, thereby achieving better surface finish quality down to 0.92 nm in Sa on binderless WC. The diamond local graphitization can also be prevented owing to the lower essential laser power and suppressed chip adhesion problem. Furthermore, the workpiece residual stress can be greatly decreased owing to the smaller thermal-affected area of HE-LAT method.