Rotary press

• US 20060083804A1
• Filed: 10/19/2005
• Published: 04/20/2006
• Est. Priority Date: 10/20/2004
• Status: Active Grant

• Current Assignee: Fette GmbH (LMT Leading Metalworking Technologies GmbH & Company KG)
• Original Assignee: Fette GmbH (LMT Leading Metalworking Technologies GmbH & Company KG)
• Inventors: Schmidt, Ingo, Ehrich, Thorsten, Schikowski, Jurgen, Bommrowitz, Helmut
• Granted Patent: US 7,654,814 B2
• Time in Patent Office: Days
• US Class Current: 425/363
• CPC Class Codes: B30B 11/08 co-operating with moulds carried by a turntable
• CPC Class Codes: B30B 15/0011 lubricating means
• CPC Class Codes: B30B 15/0082 Dust eliminating means; Mould or press ram cleaning means
• CPC Class Codes: B30B 15/34 Heating or cooling presses or parts thereof

Abstract

Rotary press comprising a rotor rotatably driven about a vertical axis, said rotor exhibiting a die plate and upper and lower punches which are vertically guided in guides of the rotor working together with die holes in a die plate, at least one press station which exhibits an upper an a lower pressure passed by the punches and through which the punches are moved towards the die hole in order to compress the material in the die hole, characterized in that the rotor is provided with means which act upon compacts or parts thereof which adhere to the pressing surface or which means eliminate or prevent an adherence of a compact or parts thereof to the pressing surface of the upper punch, respectively, during the return stroke.

Claims

1. Rotary press comprising a rotor rotatably driven about a vertical axis, said rotor exhibiting a die plate and upper and lower punches which are vertically guided in guides of the rotor working together with die holes in a die plate, at least one press station which exhibits an upper an a lower pressure passed by the punches and through which the punches are moved towards the die hole in order to compress the material in the die hole, characterized in that the rotor is provided with means which act upon compacts or parts thereof which adhere to the pressing surface or which means eliminate or prevent an adherence of a compact or parts thereof to the pressing surface of the upper punch, respectively, during the return stroke.

2. Rotary press according to claim 1, characterized in that means are provided to rotate the upper punches (20) during their return stroke, and the upper pressure roller (24) is adjusted such that the pressing surface of the upper punch (20) in the bottom dead center is on a level with the facing surface of the die plate (12) or the upper surface of the die (14), respectively.

5. Rotary press according to claim 1, characterized in that the pressing surface of at least the upper punches (20) is formed at inserts (30) of the punches and the inserts exhibit a dimensionally stable, lightly adhering plastic section (32).

6. Rotary press according to claim 5, characterized in that the inserts (30) or the plastic sections (32), respectively, are exchangeable.

7. Rotary press according to claim 1, characterized in that the rotor is provided with a spraying device, which sprays an anti-adhering means on the pressing surface of the upper punches.

8. Rotary press according to claim 1, characterized in that the rotor is provided with an impacting mechanism which gives one or more impacts on the upper punches during the return stroke of the punches.

9. Device according to claim 1, characterized in that the rotor is provided with a device for heating or cooling of the upper punches.

10. Rotary press according to claim 9, characterized in that the device directs hot or cold gas to the pressing surface of the upper punches.

11. Rotary press according to claim 1, characterized in that the rotor is provided with a device for cooling of the material to be compressed before it is filled in in the dies or within the dies.

12. Rotary press according to claim 1, characterized in that the rotor is provided with a cleaning device for cleaning of the pressing surface of the upper punches after the pressing process.

13. Rotary press according to claim 12, characterized in that the cleaning device exhibits a wiper means, with which the pressing surfaces of the upper punches are cleaned.

14. Rotary press according to claim 12, characterized in that an ultrasound cleaning device is provided.

3. Rotary press according to claim 3, characterized in that the pressing surface of the upper punch is larger than the entrance or cross-sectional surface of the die hole and the pressing surface entirely covers the die hole.

4. Rotary press according to claim 3, characterized in that the pressing surface of the upper punch is approximately equal to the outer diameter of the die (14).