Einzeltreffer — DigiBib

A method for producing wide strips of copper is performed by pouring a molten liquid into a revolving wide strip mold via a distribution container and a pour nozzle. A surface of the molten metal in the distribution container is maintained at a constant level above the place where the pour nozzle is fixed in the distribution container in the range of 75 mm to 90 mm with respect to the level of the bath surface of the mold. The molten metal is guided by an ascending channel from the distribution container to the pour nozzle and is distributed within the pour nozzle symmetrically over a width corresponding to the width of the strip. Within the pour nozzle, the molten metal is guided through first and second flow restrictors and is separated into numerous small individual flows in a vertical direction over the entire strip width of the mold.

Titel:	Method and device for the production of wide strips of copper or copper alloys
Autor/in / Beteiligte Person:	Albrecht, Michael ; Dauterstedt, Joachim ; Schütt, Hans-Jürgen ; Starke, Michael
Link:	View record in USPTO Patent Grants (Volltext)
Veröffentlichung:	2011
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Grants Sprachen: English Patent Number: 7,905,272 Publication Date: March 15, 2011 Appl. No: 12/519173 Application Filed: December 08, 2007 Assignees: MKM Mansfelder Kupfer und Messing GmbH (Hettstedt, DE) Claim: 1. A method for producing wide strips of copper or copper alloys, which comprises the steps of: guiding a molten metal from a distribution container into a lower wide strip mold via a pour nozzle inclined at an angle; maintaining a surface of the molten metal in the distribution container at a constant level above a place where the pour nozzle is fixed in the distribution container in a range of 75 mm to 90 mm with respect to a level of a mold bath surface of the lower wide strip mold; guiding the molten metal by an ascending channel from the distribution container to the pour nozzle and the molten metal is distributed within the pour nozzle symmetrically over a width which corresponds to a width of a strip to be produced; and guiding the molten metal within the pour nozzle through at least one first flow restrictor and redirected at an exit point of the pour nozzle through a second flow restrictor in a direction of the mold bath surface and separated into numerous small individual flows in a vertical direction over an entire strip width of the lower wide stripe mold, the individual flows being carried into a molten metal bath of the lower wide stripe mold as a laminar flow which forms a wedge-type outflow profile with an opening angle, running in a direction of discharge of the lower wide stripe strip, of between 15° to 30° to the mold bath surface of the lower wide stripe mold. Claim: 2. The method according to claim 1 , wherein outlets of the pour nozzle are located above the mold bath surface of the lower wide stripe mold, with a distance of the pour nozzle from the mold bath surface at a smallest point set at a ratio of distance/thickness of 1:1.5 to 1:1.1, dependent on a thickness of the strip to be poured. Claim: 3. The method according to claim 2 , which further comprises partly immersing the outlets of the pour nozzle in the mold bath surface of the lower wide stripe mold. Claim: 4. The method according to claim 1 , wherein before entering the pour nozzle the molten metal flows through a channel running parallel to a horizontal, which extends in width in the direction of flow. Claim: 5. The method according to claim 1 , wherein the molten metal in a form of the individual flows disposed in a form of rows is discharged from the pour nozzle. Claim: 6. The method according to claim 4 , which further comprises maintaining a ratio of flow rate to volume flow of 1:4 to 1:3 and of 1:1.5 to 1:2 at an entry point of the channel and at an exit point of the channel respectively. Claim: 7. The method according to claim 1 , which further comprises configuring the first flow restrictor with regards to a material thickness and cross sectional areas of openings in the first flow restrictor such that a ratio of outlet cross sectional area to volume flow of 1:8 to 1:12 is maintained, with the outlet cross sectional areas being derived from a sum of the individual cross sectional areas of the openings of the first flow restrictor. Claim: 8. The method according to claim 1 , which further comprises selectively influencing a flow rate of the molten metal by flow paths of different lengths within the first and second flow restrictors. Claim: 9. The method according to claim 1 , which further comprises reducing a flow rate of the molten metal after discharging from the pour nozzle to a value that corresponds approximately to a discharge speed of the lower wide stripe mold or is close to it. Claim: 10. A device for producing wide strips of copper or copper alloys, the device comprising: a distribution container filled with a liquid molten metal; a pour nozzle disposed downstream of said distribution container, said distribution container and said pour nozzle forming a pouring unit, said pour nozzle having a distribution section and a discharge section, with said distribution section increasing in width up to a width of a strip to be poured; a revolving wide strip mold disposed downstream of said pour nozzle and having a bath surface; said pour nozzle running diagonally downwards at a defined angle of inclination; said pouring unit disposed in such a manner that there is a difference in level of 70 to 95 mm between said bath surface of said revolving wide strip mold and a filling height; an ascending outlet channel disposed in said distribution container; said pour nozzle having a first flow restrictor extending over an entire cross sectional area and having through-flowable openings formed therein and disposed between said distribution section and said discharge section; said discharge section having a spout tapering in a direction of said revolving wide strip mold, and a lower limit of said spout running diagonally upwards at a defined angle and fitted as a discharge strip with openings formed therein pointing in a direction of said bath surface. Claim: 11. The device according to claim 10 , wherein said discharge strip is disposed at an opening angle of 15 to 30° to said bath surface of said revolving wide strip mold. Claim: 12. The device according to claim 10 , wherein a lowest point of said discharge strip is above said bath surface, at a distance from said bath surface corresponding to 0.9 to 0.5 times a thickness of the strip to be poured. Claim: 13. The device according to claim 10 , wherein a lowest part of said discharge strip is in contact with said bath surface. Claim: 14. The device according to claim 10 , wherein said discharge strip is partly immersed in said bath surface. Claim: 15. The device according to claim 10 , wherein said openings of said discharge strip are disposed in a row, with said openings within said row being of identical design. Claim: 16. The device according to claim 10 , wherein said openings of said discharge strip have different cross sectional areas. Claim: 17. The device according to claim 10 , wherein: said pour nozzle has a base section; and said openings of said first flow restrictor are disposed in a row and in an immediate vicinity of said base section of said pour nozzle. Claim: 18. The device according to claim 10 , wherein: said pour nozzle has a base section; and said openings of said first flow restrictor are disposed in a row and limited by said base section of said pour nozzle. Claim: 19. The device according to claim 10 , further comprising: a connecting piece; and a pouring channel, said connecting piece with said pouring channel are disposed between said distribution container and said pour nozzle. Claim: 20. The device according to claim 19 , wherein said pouring channel is disposed in said connecting piece and runs parallel to a horizontal and continues to increase in width in a direction of flow. Current U.S. Class: 164/488 Patent References Cited: 4475583 October 1984 Ames ; 4915270 April 1990 Daniel et al. ; 4972900 November 1990 Szczypiorski ; 5613547 March 1997 Lauener ; 5755274 May 1998 Maiwald et al. ; 6095383 August 2000 Smith ; 2006/0191664 August 2006 Sulzer et al. Assistant Examiner: Patel, Devang R Primary Examiner: Kerns, Kevin P Attorney, Agent or Firm: Greenberg, Laurence A. ; Stemer, Werner H. ; Locher, Ralph E.

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Method and device for the production of wide strips of copper or copper alloys