Abstract: A process for the manufacture of compacts, particularly cemented-carbide cutting blades, by compressing metallic powder and subsequently sintering the compacts wherein the compacts are formed in a powder press having a die-plate, an upper ram and at least one lower ram which are associated with a die-bore and are adapted to be actuated by a hydraulic press cylinder with the rams having associated thereto force-measuring devices and path-measuring devices to measure the compression forces during the ram feed motion up to the final positions, wherein the value of the energy to be applied by the upper ram is stored for a compact of predetermined geometry and dimensions and a predetermined material, that the overall energy to be applied by the upper and lower rams is further stored as a second value, that the feed motion of the upper ram is completed when the energy applied by the ram has reached the predetermined first value and the feed motion of the lower ram is effected depending on the application of the res

Abstract: A method for minimizing the spread of the maximum compression forces in compacting powder, specifically metallic powder, by means of a powder press which has a die-plate, an upper ram, and at least one lower ram which are associated with a die-bore and are respectively operable by a hydraulic press cylinder, and a charging shoe movable on the die-plate along a predetermined path for filling the die-bore with the powder, wherein the maximum compression force of at least the upper ram is measured upon arrival at a predetermined position, the charging shoe, the die-plate, the upper ram and/or lower ram are vibrated at a predetermined frequency and amplitude during the filling operation and/or at the beginning of the compression procedure and, in addition, the filling time or the course of charging shoe motion in time are predetermined, wherein the frequency distribution of the maximum compression force values is determined at intervals and the standard deviation is determined therefrom for the maximum compressio

Abstract: A hydraulic press for compressing metallic powder or the like to form compacts, comprising a die-plate, an upper ram, and at least one lower ram which interact with a die-bore and are operable each by a dual-action hydraulic press cylinder, whereby a limited dead path length is provided for the return stroke in the force path between the press cylinder and the upper ram in which the upper ram is not carried along, and that a separate pressure generator producing a variable pressure is arranged in parallel with the force path via which a compression force is produced on the upper ram during the dead path length.

Abstract: An arrangement of a die-plate of a hydraulic press to press powdered material into shape wherein an upper ram and a lower ram interact with a bore of the die-plate wherein the die-plate is supported via vertically arranged supporting standards which, along with upper supporting portions which are cantilevered towards the axis of the die-bore, define upwardly facing bearing areas located close to the die-bore for the die-plate.

Abstract: A process for compressing metallic powder into a compact in a powder press which has a die-plate, a hydraulically operated upper ram and at least one hydraulically operated lower ram, wherein the lower ram is set to vibrations while the die-plate is being filled with metallic powder.

Abstract: A process for the manufacture of compressed articles, particularly cemented-carbide cutting blade inserts, by compacting metallic powder and subsequently sintering the compact, particularly cemented-carbide reversible cutting blade inserts, which have a seating surface and at least one cutting edge extending approximately in parallel with the seating surface which is at a predetermined distance from the seating surface, by means of a press having a die-plate and a top ram and a bottom ram, comprising the steps of: Charging a predetermined volume of metallic powder into the die-plate bore with the bottom ram taking a predetermined charging position in the die-plate bore, Displacing the bottom ram and the top ram to predetermined first and second positions, Displacing the bottom ram and, if need be, the top ram more while simultaneously measuring the compressive force at least for the bottom ram with the shift of the bottom ram or top ram being effected along a predetermined curve desired for the compressive

Abstract: An arrangement of a die-plate of a hydraulic press to press powdered material into shape wherein an upper ram and a lower ram interact with a bore of the die-plate wherein the die-plate is supported via vertically arranged supporting standards which, along with upper supporting portions which are cantilevered towards the axis of the die-bore, define upwardly facing bearing areas located close to the die-bore for the die-plate.

Abstract: A process for the manufacture of compacts, particularly cemented-carbide cutting blades, by compressing metallic powder and subsequently sintering the compacts wherein the compacts are formed in a powder press having a die-plate, an upper ram and at least one lower ram which are associated with a die-bore and are adapted to be actuated by a hydraulic press cylinder with the rams having associated thereto force-measuring devices and path-measuring devices to measure the compression forces during the ram feed motion up to the final positions, wherein the value of the energy to be applied by the upper ram is stored for a compact of predetermined geometry and dimensions and a predetermined material, that the overall energy to be applied by the upper and lower rams is further stored as a second value, that the feed motion of the upper ram is completed when the energy applied by the ram has reached the predetermined first value and the feed motion of the lower ram is effected depending on the application of the res

Abstract: A method for minimizing the spread of the maximum compression forces in compacting powder, specifically metallic powder, by means of a powder press which has a die-plate, an upper ram, and at least one lower ram which are associated with a die-bore and are respectively operable by a hydraulic press cylinder, and a charging shoe movable on the die-plate along a predetermined path for filling the die-bore with the powder, wherein the maximum compression force of at least the upper ram is measured upon arrival at a predetermined position, the charging shoe, the die-plate, the upper ram and/or lower ram are vibrated at a predetermined frequency and amplitude during the filling operation and/or at the beginning of the compression procedure and, in addition, the filling time or the course of charging shoe motion in time are predetermined, wherein the frequency distribution of the maximum compression force values is determined at intervals and the standard deviation is determined therefrom for the maximum compressio

Abstract: A process for compressing metallic powder into a compact in a powder press which has a die-plate, a hydraulically operated upper ram and at least one hydraulically operated lower ram, wherein the lower ram is set to vibrations while the die-plate is being filled with metallic powder.

Abstract: A hydraulic press for compressing metallic powder or the like to form compacts, comprising a die-plate, an upper ram, and at least one lower ram which interact with a die-bore and are operable each by a dual-action hydraulic press cylinder, whereby a limited dead path length is provided for the return stroke in the force path between the press cylinder and the upper ram in which the upper ram is not carried along, and that a separate pressure generator producing a variable pressure is arranged in parallel with the force path via which a compression force is produced on the upper ram during the dead path length.

Abstract: A process for the manufacture of compressed articles, particularly cemented-carbide cutting blade inserts, by compacting metallic powder and subsequently sintering the compact, particularly cemented-carbide reversible cutting blade inserts, which have a seating surface and at least one cutting edge extending approximately in parallel with the seating surface which is at a predetermined distance from the seating surface, by means of a press having a die-plate and a top ram and a bottom ram, comprising the steps of: