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AssigneeOskar Frech GmbH + Co. KG
InventorsRoland Fink, Norbert Erhard, Herbert Noschilla, Bruno Stillhard, Ronald Siegrist
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A pressing-in unit for a hot-chamber pressure diecasting machine permits an electro-mechanical drive for the casting plunger. In order to absorb the moments of inertia of the drive which occur during the switch-over of the casting plunger drive from the mold filling phase to the after-pressure phase, a spring element in the form of a plastic component or a liquid spring is inserted between the casting plunger and the pusher rod moved by the electric drive, which spring element is compressed by the additional path which the pusher rod still covers after the braking of the motor. The extent of the compression is selected such that the resulting axial force which is exercised by the plastic component or by the liquid spring is sufficient for causing the desired after-pressure in the molten metal.
Pressing-in unit for a hot-chamber pressure diecasting machine for processing molten metals, having a casting plunger for pressing casting material into a mold, which said casting plunger can be acted upon by way of a pusher rod which is connected with a linear drive driven by an electric motor, said linear drive, after a filling phase of the mold, being held in a pressure phase for achieving a necessary pressure in the casting material, a spring element being connected between the casting plunger and the pusher rod, wherein the spring element comprises one of an elastic plastic component and a liquid spring and provides a reaction force onto the casting plunger caused by stress of the spring element large enough for applying an axial force required for achieving the necessary pressure in the casting material during the pressure phase.
Pressing-in unit for a hot-chamber pressure diecasting machine for processing molten metals, which has a casting plunger for pressing casting material into a mold, which said casting plunger can be acted upon by way of a pusher rod which is connected with a linear drive, which said linear drive, after a filling phase of the mold, is held in a pressure phase for achieving a necessary pressure in the casting material, a spring element being connected between the casting plunger and the pusher rod, wherein the spring element is configured such that reaction forces onto the casting plunger caused by the spring element are large enough for applying an axial force required for achieving the necessary pressure in the casting material, wherein the spring element is an elastic plastic ring which is held between two disks of which one is held on the pusher rod and the other is fixedly connected with a sleeve telescopically guided on the pusher rod.
Dependencies are inferred from the claim text.