Fabrication of CVD diamond micro-milling tool by hybrid machining of laser-induced graphitization and precision grinding. Issue 18 (15th December 2019)

• Record Type: Journal Article
• Authors: Yang, Yinfei; Zhao, Guolong; Hu, Maoshun; Li, Liang; He, Ning; Jamil, Muhammad
• Is Part Of: Ceramics international. Volume 45:Issue 18(2019)Part A
• Page Start: 24127
• Page End: 24136
• Publication Date: 2019-12-15
• Subjects: Microstructure-final -- Surfaces -- Thermal properties -- Cutting tools; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.08.121
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Owing to exceptional hardness and wear resistance, Chemical Vapor Deposition (CVD) diamond material is broadly used for micro-milling tools. However, the fabrication of CVD diamond micro-milling tool by a traditional grinding process is less efficient in terms of productivity and edge quality. In this manuscript, a novel hybrid machining process combining laser-induced diamond graphitization with precision grinding is performed to attain high-quality production of CVD diamond micro-milling tools. The effects of laser parameters on the phase transformation depth of the diamond, and the maximum peak-to-valley height of the boundary contour (Rt ), are investigated. The influence of Rt on the cutting-edge quality is studied. Results have indicated that single pulse energy is directly proportional to the diamond phase transformation depth and Rt . In addition, the scanning speed and track displacement have an inverse relation with phase transformation depth and the Rt . Furthermore, a low value of Rt has provided better cutting-edge quality after conducting precision grinding. In order to improve the fabrication efficiency, a solution for roughing, semi-finishing and finishing processes is proposed. Based on the optimum parameters, a sharp CVD diamond micro-milling tool with cutting-edge radius of 2.5 μm and tool tip radius of 3.5 μm is fabricated. The case study has demonstrated that the proposed hybrid machining process improves the process efficiency.