Abstract A press for hydrostatic extrusion of tubes includes a high pressure cylinder axially displaceable in a press stand with a die insertable into the cylinder and a pressure generating punch insertable into the cylinder to generate the pressure for extrusion. A mandrel is carried by a rod which passes through the pressure-generating punch. A hollow billet is inserted into such a structure which has the central opening therethrough at the point adjacent the die of smaller cross-section than that of the mandrel. When the mandrel is advanced towards the die, it engages the narrowed portion of the bore of the billet and presses it against the die, holding it there while the pressure chamber is advanced around the billet and the extrusion takes place.
Method for hydrostatic extrusion of tubes in a press comprising a pressure chamber formed by a high-pressure cylinder axially displaceable in a press stand, a die insertable into the cylinder and a tubular pressure-generating punch insertable into the cylinder to generate the pressure necessary for the extrusion process in a pressure medium enclosed in the pressure chamber and surrounding a billet to be extruded, a rod part passing through the pressure-generating punch, and a mandrel part carried by the rod part, which comprises placing a hollow billet shaped at one end with a smaller inner dimension than the outer dimension of the mandrel part in the press with the end of smaller inner dimension facing the die, pushing the mandrel part into the billet up to the point where the inner dimension is smaller than the outer dimension of the mandrel part, thereby pressing the billet against the die, and, while keeping the billet pressed against the die by the mandrel part, closing the pressure chamber and putting it under pressure to extrude the billet.
Claim 2
Dependent Claim
175 words
Method for hydrostatic extrusion of tubes in a press comprising a pressure chamber formed by a high-pressure cylinder axially displaceable in a press stand, a die insertable into the cylinder and a tubular pressure-generating punch insertable into the cylinder to generate the pressure necessary for the extrusion process in a pressure medium enclosed in the pressure chamber and surrounding a billet to be extruded, a rod part passing through the pressure-generating punch, and a mandrel part carried by the rod part, which comprises placing a hollow billet shaped at one end with a smaller inner dimension than the outer dimension of the mandrel part in the press with the end of smaller inner dimension facing the die, pushing the mandrel part into the billet up to the point where the inner dimension is smaller than the outer dimension of the mandrel part, thereby pressing the billet against the die, and, while keeping the billet pressed against the die by the mandrel part, closing the pressure chamber and putting it under pressure to extrude the billet.