Method of manufacturing cemented carbide cutting tool and cutting tool manufactured by the method
Method of manufacturing a cemented carbide cutting tool, includes a) bonding a body part of hot work tool steel and a cutting part of cemented carbides together by heat treatment; b) cooling the bonded body part and cutting part for a preset period of time; c) machining the cutting part to have a predetermined pattern according to its application and forming a cutting tool; d) coating a surface of the machined cutting tool with a film of at least one of metallic oxides, nitrides and carbides; and e) cooling the coated cutting tool for a preset period of time in air, and a cutting tool manufactured by the method. Cracks do not generate even after the coating step, and thus cemented carbide cutting tool having excellent mechanical properties may be manufactured.
1. A method of manufacturing a cemented carbide cutting tool, comprising:
a) bonding a body part of hot work tool steel and a cutting part of cemented carbides together by heat treatment;
b) cooling slowly the bonded body part and cutting part for 24 hours in a vacuum chamber;
c) machining the cutting part to have a predetermined pattern according to its purpose and forming a cutting tool;
d) coating a surface of the machined cutting tool with a film of at least one of a metallic oxide, a nitride and a carbide so as to enhance mechanical properties of the cutting tool; and
e) cooling the coated cutting tool for a preset period of time in air.
2. The method of claim 1 , wherein the hot work tool steel is SKD61 and the step a) comprises bonding the body part and the cutting part at a temperature of 800 to 1200° C. by high-frequency welding or oxygen welding.
3. The method of claim 1 , wherein the step c) comprises grinding the cutting part by a relief grinder so that a plurality of blades having the same cutting relief angle are formed of a curved shape in a circumferential direction of the cutting part.
4. The method of claim 1 , wherein the step d) comprises depositing a titanium aluminum nitride (TiAlN) on a surface of the cutting tool at a temperature of 400 to 700° C. with a thickness of 2 to 4 micro-meters.