Hydraulic extrusion press and method for operating a hydraulic extrusion press

Patent metadata

Field	Value
Publication number	US-11407192-B2
Application number	US-201314399579-A
Country	US
Kind code	B2
Filing date	May 10, 2013
Priority date	May 10, 2012
Publication date	Aug 9, 2022
Grant date	Aug 9, 2022

Abstract

A hydraulic extrusion press includes at least one ram, the ram being driven by hydraulic oil from a main line and a hydraulic control pressure being used to control the extrusion press. To minimize non-productive periods, the control pressure is also supplied to the main line. The main line and the pressure control system are connected with one another on the pressure side.

First claim

The invention claimed is:

1. A method for operation of a hydraulic extrusion press comprising:
providing the hydraulic extrusion press having a hydraulic control pressure system comprising a control pressure pump and at least one ram, in which at least the ram is driven via hydraulic oil from a main line comprising first and second main pumps, and a hydraulic control pressure supplied by the control pressure pump connected to the first and second main pumps is used to control the extrusion press; and
operating the hydraulic extrusion press so that:
the control pressure pump makes the hydraulic control pressure available by way of control oil,
the control pressure system is securable against volume streams from the main line,
the control pressure system drives secondary consumers,
the control pressure system drives a valve control and/or applies a release pressure,
the hydraulic control pressure is also applied to the main line, and
the main line and the control pressure system are connected with one another on a pressure side of the hydraulic extrusion press by way of a connection line,
connecting the control pressure system with the main line by way of said connection line and proportionally controlling volume in the connection line; and
proportionally controlling the volume by a throttle in said connection line.

2. The method according to claim 1 , further comprising applying the hydraulic control pressure to the main line by way of proportional volume stream control.

3. The method according to claim 1 , further comprising volume-regulating the main line, keeping the hydraulic control pressure above a minimum pressure, or volume-regulating the main line and keeping the hydraulic control pressure above a minimum pressure.

4. The method according to claim 1 , further comprising storing hydraulic oil in a storage device and applying the hydraulic oil stored in the storage device to the main line from the storage device, by way of the hydraulic control pressure.

5. The method according to claim 4 , further comprising emptying the storage device into the main line at a pressure below the hydraulic control pressure.

6. The method according to claim 4 , further comprising providing the hydraulic oil from the storage device starting from a storage pressure.

7. The method according to claim 4 , wherein the storage device is arranged between the control pressure pump and the throttle on the control line side of the throttle.

8. The method according to claim 1 , further comprising providing a kickback valve in the connection line on a main line side of said throttle.

9. The method according to claim 1 , wherein the main line is volume-regulated and the control pressure system is pressure regulated.

10. The method according to claim 1 , wherein the connection line makes a volume stream available to the main line.

11. A method for operation of a hydraulic extrusion press comprising:
providing the hydraulic extrusion press having a hydraulic control pressure system comprising a control pressure pump and at least one ram, in which at least the ram is driven via hydraulic oil from a main line comprising first and second main pumps, and a hydraulic control pressure supplied by the control pressure pump connected to the first and second main pumps is used to control the extrusion press; and
operating the hydraulic extrusion press so that:
the control pressure pump makes the hydraulic control pressure available by way of control oil,
the control pressure system is securable against volume streams from the main line,
the control pressure system drives secondary consumers,
the control pressure system drives a valve control and/or applies a release pressure,
the hydraulic control pressure is also applied to the main line, and
the main line and the control pressure system are connected with one another on a pressure side of the hydraulic extrusion press by way of a connection line,
connecting the control pressure system with the main line by way of said connection line and proportionally controlling volume in the connection line; and
proportionally controlling the volume by a two-way pressure compensator in said connection line.

12. The method according to claim 11 , further comprising applying the hydraulic control pressure to the main line by way of proportional volume stream control.

13. The method according to claim 11 , further comprising volume-regulating the main line, keeping the hydraulic control pressure above a minimum pressure, or volume-regulating the main line and keeping the hydraulic control pressure above a minimum pressure.

14. The method according to claim 11 , further comprising storing hydraulic oil in a storage device and applying the hydraulic oil stored in the storage device to the main line from the storage device, by way of the hydraulic control pressure.

15. The method according to claim 14 , wherein the storage device is arranged between the control pressure pump and the two-way pressure compensator on the control line side of the two-way pressure compensator.

16. The method according to claim 11 , further comprising connecting the two-way pressure compensator with the connection line on a main line side of the two-way pressure compensator by a linking line for controlling the two-way pressure compensator.

17. The method according to claim 11 , further comprising proportionally controlling the volume by a throttle in said connection line.

18. The method according to claim 17 , further comprising proportionally controlling the volume by said throttle in said connection line on a main line side of the two-way pressure compensator.

19. The method according to claim 18 , further comprising connecting the two-way pressure compensator to a portion of the connection line extending between the two-way pressure compensator and the throttle on the main line side of said two-way pressure compensator by a linking line.

20. The method according to claim 17 , further comprising providing a kickback valve in said connection line on a main line side of the two-way pressure compensator.

21. The method according to claim 20 , further comprising providing the throttle in said connection line between the kickback valve and the two-way pressure compensator on the main line side of the two-way pressure compensator.

22. The method according to claim 21 , further comprising connecting the two-way pressure compensator to a portion of the connection line extending between the throttle and the kickback valve on the main line side of said two-way pressure compensator by a linking line.

23. The method according to claim 17 , further comprising providing the throttle in said connection line between the kickback valve and the two-way pressure compensator on a main line side of the two-way pressure compensator.

24. The method according to claim 23 , further comprising connecting the two-way pressure compensator to a portion of the connection line extending between the throttle and the kickback valve on the main line side of said two-way pressure compensator by a linking line.

25. The method according to claim 11 , wherein the main line is volume-regulated and the control pressure system is pressure regulated.

26. The method according to claim 11 , wherein the connection line makes a volume stream available to the main line.

Assignees

• Sms Group Gmbh

Inventors

• Poggenpohl Klaus

Classifications

• B21C23/211 Primary

  Press driving devices · CPC title

• B21C31/00

  Control devices for metal extruding, e.g. for regulating the pressing speed or temperature of metal (B21C25/08 takes precedence); Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses · CPC title

• B21C23/21 Primary

  Presses specially adapted for extruding metal · CPC title

• B30B1/32 Primary

  by plungers under fluid pressure · CPC title