To provide a plastic working device less in the wear of a working tool and capable of stably achieving the mass production of a worked product less in defects such as cracks generated in the worked product, and in variance of the product characteristics, and excellent in quality.
A plastic working device 1a manufacture a product of the prescribed shape and dimension by giving the prescribed working force to a work through a working tool 7 to apply the plastic deformation to the work. At least a contact part of the working tool 7 with the work 10 is formed of the hard alloy which consists of the hard phase consisting of tungsten carbide particles and the bond phase consisting of at least one kind to be selected among Ni, Cr and their compounds, in which the weight ratio of the bond phase is 5-25% and the oxidation increase is ≤2 g/m2 during the heating for one hour in the atmosphere at the temperature of 900°C.
TANAKA TAKASHI
NOZAKI YUKIO
