Method for vacuum diecasting and diecasting mould

• US 6,997,231 B1
• Filed: 02/21/2000
• Issued: 02/14/2006
• Est. Priority Date: 04/01/1999
• Status: Expired due to Fees

• Current Assignee: B.T.B.H. Holdings Limited, Buhler Druckguss AG
• Original Assignee: Buhler Druckguss AG
• Inventors: Niedermann, Benno, Brugger, Werner, Jung, Paul
• Primary Examiner(s): Stoner, Kiley
• Assistant Examiner(s): MCHENRY, KEVIN L
• Application Number:
  US09/937,873
• Time in Patent Office: 2,185 Days
• Field of Search: 164/61, 164/63, 164/65, 164/253, 164/254, 164/113, 164/306, 164/312, 164/313
• US Class Current: 164/61
• CPC Class Codes: B22D 17/14 Machines with evacuated die cavity

Abstract

The invention relates to a method for vacuum diecasting and a diecasting mould (1), especially for diecasting components made of metal or the alloys thereof. The aim of the invention is to provide a better casting quality while simplifying the procedure of the method. To this end, the evacuation of the die cavity (5) and the filling with molten bath are carried out independently from one another.

Claims

1. A die casting mold for the production of cast parts from metals and/or their alloys, comprising:

a mold cavity having at least first and second sides;

a casting chamber;

an injection channel;

an isolation valve positioned at the first side of the mold cavity;

a vacuum device for evacuation of the mold cavity and injection channel through the isolation valve; and

a chamber valve movable to control an opening between the casting chamber and the injection channel and being positioned at the second side of the mold cavity.

2. A die casting mold according to claim 1, further comprising a casting plunger associated with one end of the casting chamber, and the opening between the casting chamber and the injection channel lies opposite to the casting plunger.

3. A die casting mold according to claim 1, wherein the chamber valve is provided with a seal.

4. A die casting mold according to claim 3, wherein the chamber valve is connected via a plunger rod with a hydraulic element in such a way that temperatures of the chamber valve and hydraulic element are different.

5. A die casting mold according to claim 1, wherein the chamber valve is connected via a plunger rod with a hydraulic element in such a way that temperatures of the chamber valve and hydraulic element are different.

6. A process for vacuum die casting metals and/or metal alloy parts with a die casting mold, the die casting mold including a mold cavity having first and second sides, a casting chamber, an injection channel, a vacuum device, an isolation valve, and a chamber valve distinct from the isolation valve that is positioned between the casting chamber and the injection channel, comprising:

evacuating the mold cavity and injection channel through the isolation valve with the vacuum device at the first side of the mold cavity;

filling the casting chamber completely with metal melt; and

filling the mold cavity with molten melt from the casting chamber through the chamber valve at the second side of the mold cavity after the evacuating step.

7. A process according to claim 6, wherein the mold cavity is evacuated while the casting chamber is being filled.

8. A process according to claim 7, wherein the chamber valve is hydraulically controlled.

9. A process according to claim 6, wherein the chamber valve is hydraulically controlled.

10. A die casting mold for the production of cast parts from metals and/or their alloys, comprising:

a mold cavity;

a casting chamber;

an injection channel;

an isolation valve;

a vacuum device for evacuation of the mold cavity and injection channel through the isolation valve; and

a chamber valve movable within the casting chamber to control an opening between the casting chamber and the injection channel, the chamber valve being operable independent of the isolation valve.