Abstract
Recently the die with cemented carbide is used for many industrial products, because that has high stiffness and long life. Hand lapping is mainly used in finishing of them because of high quality on the products. Non-traditional machining such as electron beam process finally does not catch up with the hand lapping level at state. On the other hand, there are several problems even the hand lapping; the geometric tolerance often become worse by manual control of human. In this study, new lapping system was developed without special units or tools using old CNC milling machine and reciprocating unit. Diluted starch syrup and diamond powder mixture is used as optimum cheap lapping slurry. Developed lapping system could machine effectively than hand lapping regarding surface roughness and process time. It is concluded from the results that, (1) The work piece with cemented carbide was finished below Rz=0.1μm without worsening of geometric tolerance, (2) Diluted starch syrup and diamond powder mixture could work effectively as lapping slurry, (3) Excellent new lapping system with simple setup was established.
