Patent ID: 8679387

Claim:
A compression molding method for particulate matter filled in a cavity of a die by an upper punch arranged above the die, or by a lower punch arranged underneath the die, comprising: compressing the particulate matter filled in the cavity of the die to a predetermined pressure by moving the upper punch downwardly or moving the lower punch upwardly; and thereafter further compressing the particulate matter by applying an impact force thereto by actuating an impact force applying means arranged between the upper punch and an upper ram to which the upper punch is attached, or arranged between the lower punch and a lower ram to which the lower punch is attached, wherein said compression of the particulate matter to the predetermined pressure by moving the upper punch downwardly or moving the lower punch upwardly is carried out by applying a weight of the upper punch falling gravitationally within a clearance created between a reciprocating mechanism of the upper punch and the upper ram.