Powder forming press method of powder compact for cutting insert and powder forming press apparatus

摘要

To manufacture a cutting insert partially different in thickness between upper and lower surfaces without causing distortion or deformation.SOLUTION: In a powder molding pressing method of a green compact for a cutting insert in which the thickness in the insert center line PO direction between the upper and lower surfaces is partially different, in a state where the lower punch 12 is inserted into the hole 11A of the die 11 from below , The preliminary forming upper punch 14 having the preforming surface 14B whose filling and conveying direction is opposite to the shape obtained by filling the molding space Q with the raw material powder R and inverting the upper surface of the cutting insert powder compact in a plane-It is inserted into the molding space Q from the upper side and refilled with the raw material powder R to form a larger amount of raw material than the thin part in the thick part in the direction of the insert center line PO between the upper and lower surfaces The powder R is filled and the final upper forming punch is inserted into the molding space Q from the upper side to powder-press the raw material powder R.(FIG.