High-Speed Sharpening and Thermo-activated Refinement of Blade Tools from Synthetic Diamonds

Abstract

Processing of synthetic diamonds is accompanied by low productivity and high values of relative consumption of diamond wheels. The coefficient of use of diamond grains in these processes does not exceed 5-10%. Using synthetic diamonds as a blade tool, requires sharpening and refinement. This study proposes to use ultra-high-speed machining modes and the same diamond grinding wheel at all stages of tool shaping. At the first stage, i.e. at high speeds, a rough productive sharpening of diamond blade tool is made with a wheel on an iron-based binder. At the second stage processing speed is reduced, as a result grains cease to self-sharpen and to wear out. When the iron binder comes into contact with the sharpened diamond, the speed must be increased, so that the temperature in the contact zone of the binder with the rough surface of the cutter, increases. Due to diffusion wear, from the surface of the diamond, the height of the roughness micro-hills decreases. In other words, the process of high-quality thermally activated refinement of the working surface of the diamond cutter starts to be implemented.

Theoretical Assessment of the Role of Bond Material during Grinding of Superhard Materials with Diamond Wheels

“…This parameter is necessary to determine the number of actually working grains and the actual contact area in the "SHM-grain-bond" system. As a fracture criterion, the excess of the reduced stress of the yield point of the bond material or the impact toughness value, which for the strongest bonds M6-16 and M6-14, is 66 and 61.4 kJ/m 2 , respectively, is used [40]. The yield points of bonds based on aluminum, bronze, and iron are 200, 270, and 470 MPa, respectively [41].…”