Abstract:
In the hydrostatic extrusion of a body through an opening, such as a die opening, the hydrostatic extrusion is begun by raising the pressure of the pressure fluid to a predetermined amount, and thereafter while continuing such pressure applying a tensile force to a portion of the body which is beyond the opening. The portion extending through the die may be preformed, or may be formed by the starting of hydrostatic extrusion. The end of the billet which engages the die is formed with double conicity.
Abstract:
In the hydrostatic extrusion of tubing, a hollow billet is pressed forward into the conical die opening of the press by a following piston until the material of the billet is pressed inwardly against the mandrel and is shaped to the conical surface of the die, after which pressure fluid is admitted around the billet for hydrostatic extrusion.
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.
Abstract:
In the hydrostatic extrusion of rods having ribs extending from a core part, extending longitudinally or helically, a billet is hydrostatically extruded through a die having grooves which decrease in width from the inlet die towards the smallest crosssection of the die opening, so that the grooves are filled with the material of the billet.