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US 9,802,246 B2Granted
Device, system and method for die-casting metallic material in the thixotropic state
AssigneeMold-Thix-Consulting Bueltermann GmbH
InventorBernd Bültermann
Life of this patent
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Abstract
A device for die-casting metal material, including a screw unit for bringing the material into a thixotropic state and a cylinder/piston unit fed by the screw unit for applying pressure to the thixotropic material for the die casting, wherein a thermally controllable valve is arranged between the screw unit and the cylinder/piston unit.
Claims19
A device for die-casting metal material, comprising;
- a screw unit for bringing the material into a thixotropic state;
- a cylinder/piston unit fed by the screw unit for applying pressure to the thixotropic material for the die casting;
- and a thermally controllable valve arranged between the screw unit and the cylinder/piston unit;
- wherein the thermally controllable valve includes a connection channel having controllable means for cooling of material located therein until said material is below the solidification temperature thereof, and wherein the connection channel widens in the direction from the screw unit to the cylinder/piston unit so that material solidified therein forms a form-fitting plug which widens in the direction of the cylinder/piston unit to prevent movement of the plug back into the screw unit and reliably keep high injection pressures of the cylinder/piston unit away from the screw unit;
- wherein the screw of the screw unit is axially displaceable and, on its side facing the valve, has a cone seal for sealing with respect to a conical annular shoulder on the inner periphery of the screw unit.
2 more elements
A device for die-casting metal material, comprising;
- a screw unit for bringing the material into a thixotropic state;
- a cylinder/piston unit fed by the screw unit for applying pressure to the thixotropic material for the die casting;
- and a thermally controllable valve arranged between the screw unit and the cylinder/piston unit;
- wherein the thermally controllable valve includes a connection channel having controllable means for cooling of material located therein until said material is below the solidification temperature thereof, and wherein the connection channel widens in the direction from the screw unit to the cylinder/piston unit so that material solidified therein forms a form-fitting plug which widens in the direction of the cylinder/piston unit to prevent movement of the plug back into the screw unit and reliably keep high injection pressures of the cylinder/piston unit away from the screw unit;
- wherein at least one stirring element is arranged on an effective piston area of the piston, and the piston can additionally be driven in rotation.
2 more elements
A method for die-casting metal material in a thixotropic state, comprising:
- bringing the metal material into the thixotropic state in a screw unit,
- feeding the thixotropic material from the screw unit via a connection channel into a cylinder/piston unit, wherein the connection channel widens in the direction from the screw unit to the cylinder/piston unit,
- allowing the material located in the connection channel to solidify to form a form-fitting plug widening in the direction of the cylinder/piston unit,
- injecting the thixotropic material from the cylinder/piston unit into a die-casting mould whilst the connection channel is blocked by the solidified material therein to reliably keep high injection pressures of the cylinder/piston unit away form the screw unit, and
- wherein the thixotropic material is stirred in the cylinder/piston unit before and/or during the injection procedure.
2 more elements
Dependencies are inferred from the claim text.