Abstract
WC-Co type hard metals using for the die materials are mainly machined by grinding. The grinded wastes produced by grinding, which are very fine grains (<10μm ) were thrown into the discard at present. In this experiment, the recycling technique of grinded wastes were studied. The mechanical properties of recycled metals were examined by hardness test (HRA) and the transverse rupture strength test.
As a result, it was found out that the recycling process of the grinded wastes could be completed by 7 processes. Especially, the reducing process at 1073K and the recarburizing process before the compacting process were very important. The recarburizing process was to add graphite of total 6.0 mass%. The mechanical properties of recycled metals were almost satisfied with JIS standard values (H5501).
