Abstract: A method of producing trimming dies with a conical many-sided bore for use in a screw trimming press. A trimming die blank is produced with an outer diameter corresponding to the inner diameter of a cup-shaped holder and to a finished height and with a cylindrical inner bore. The many-sided bore is produced by cold deformation of the inner diameter by means of a many-sided punch introduced to a limited extent into the inner bore while preserving the outer diameter. Apparatus for carrying out the method includes a holder for the trimming die blank. A spacer ring located below the blank and resting on the base of the holder in use, a guide sleeve and a many-sided punch guidable by said guide sleeve and having a length exceeding that of the guide sleeve by an amount corresponding to a predetermined insertion depth of the punch in the blank. The base of the holder has an ejector bush with an ejector mandrel.

Abstract: A method and apparatus are provided for producing a cross-slotted die for forming cross-slotted screw heads. One end face of a cylindrical blank is turned to form a cone having a cone angle of between 124.degree. and 140.degree.. The cross shape is produced in this face by a single cold forming stage while preserving the outer diameter of the blank. The blank is held in a cylindrical holder having a bore with an internal diameter corresponding to the diameter of the cylindrical blank. An ejection mandrel engages in the bore to form the base of the holder. A platen carries a punch for insertion into the bore to deform the end face of the blank.