cutting edge

The specificities of magneto-abrasive machining of cutting taps made from high-speed steel were researched. Surface roughness after cycle machining of cutting taps on the front surface is reduced to Ra=0,1µm, on the back surface to Ra=0,7—0,9µm, on the cylindrical surface — Ra=0,2— 0,4µm, depending on the conditions of basing the machined pieces during machining, surface hardness increases to 9—10GPa, radii of cutting edge rounded increases on 5–10%. It is shown, that the moment for cutting taps at tapping after MAM on 15–40% less than for unmachined taps.

Based on the analysis of longitudinal and transverse deviations that occur during screw thread forming proposed application aids automatic calculation of the cutting edge forms of the tool depending on the value of a forward angle and diameter of the thread.