Cutting plate, method and compression mold for manufacturing the green body of the cutting plate

摘要

The present invention relates to a method for manufacturing a cutting plate made of a hard metal, particularly a sintered carbide, by multiaxial pressing of a powder mixture of a hard metal component and a binder to form a green body (10), followed by sintering the green body; , said green body comprising, after pressing, two substantially parallel main surfaces 1a, 1b and a peripheral edge surface 3, 3a, 3b extending between and connecting the main surfaces at their periphery and the main surfaces comprise depressions 4a, 4b, wherein the cutting edges 6a, 6b are at the intersection of the bottom of the depressions and at least a portion of the edge surface 3a, 3b. compacting the powder mixture to form a cutting plate green body with side punches at least partially extending into the edge surface to be formed, the powder mixture being movable along at least a first direction to form the edge surfaces; a heading tool supplied to a compression mold comprising a cavity defined by at least one heading punch movable substantially perpendicular to the first direction for wherein said heading tool comprises two parts, one of said parts being a main punch (23a, 23b), and the other of said parts being an independently movable forming punch (24a, 24b); In one pressing step, the forming punches 24a, 24b form a pre-compressed portion of the green body adjacent the edge surface 3 and comprising an area designed to be the area of minimum final thickness of the green body. While moving towards the powder mixture, in the second step, the main punch 23a, 23b and the forming punch 24a, 24b both have the depressions 4a, 4b, 5a, 5b in the green body. ) parallel main surfaces comprising characterized in that they are moved towards their final positions to give the final dimensions of (1a, 1b). The present invention further discloses a corresponding compression tool and cutting plate.