Method for manufacturing tungsten carbide-based cemented carbide tool excellent in thermal crack resistance

摘要

PROBLEM TO BE SOLVED: To provide a method of manufacturing a tungsten carbide-based cemented carbide tool exhibiting excellent thermal crack resistance in wet milling cutting or the like.SOLUTION: A method of manufacturing a WC-based cemented carbide cutting tool excellent in thermal crack resistance, comprises: disintegrating and mixing base powder comprising 6-12 mass% of cobalt powder having a mean particle size of 1.5 μm or less, chromium-containing powder having a means particle size of 4.0 μm or less and having a mass ratio of chromium to cobalt of 4-9 mass% and/or vanadium-containing powder having a mean particle size of 2.0 μm or less and having a mass ratio of vanadium to cobalt of 2-3 mass%, and a remainder of tungsten carbide powder having a mean particle size of 0.5-2.0 μm, by means of an attritor for 20 minutes to one hour to produce a slurry; cyclically and sequentially repeating a slurry grinding treatment by means of the attritor and a slurry mixing treatment by means of a bead mill for one to six hours to provide a green body; and sintering the green body.