Method of producing a continuously processed copper rod
First Claim
1. A method of producing a continuously processed copper rod having a lower yield tensile strength, elongation and recrystallization temperature than conventionally processed copper rod comprising the steps of:
- a. continuously casting molten copper containing normal impurities into a cast bar at a rate at which said impurities are trapped in solid solution;
b. substantially immediately hot-rolling the cast bar in the as-cast condition into continuous rod at a rate at which said impurities are retained in solid solution;
c. hot-coiling the continuous rod prior to any substantial cooling thereof from the hot-rolling temperature; and
d. gradually cooling the coiled rod to room temperature to permit precipitation of substantially all of said impurities thereby lowering the recrystallization temperature of the rod.
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Abstract
In a continuous casting system where molten copper is cast into a bar and then rolled into a rod, the copper rod is immediately hot-coiled before being subjected to any quenching or cooling operation. The hot-coiling of the rod is carried out at a temperature of from 700° F. to 1200° F. and preferably within a range of from 950° F. to 1150° F., so that the rod is hot-coiled at a high enough temperature to permit sufficient thermal vacancy diffusion to occur within the rod material, and thereafter gradually cooled to room temperature to thereby impart certain improved mechanical properties to the resultant rod product. A copper or copper alloy rod which is processed in this fashion has a lower yield tensile strength, lower ultimate tensile strength, lower recrystallization temperature, lower hardness and is much more ductile and hence easier to draw into wire than a corresponding rod which is quenched or cooled prior to coiling.
13 Citations
10 Claims
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1. A method of producing a continuously processed copper rod having a lower yield tensile strength, elongation and recrystallization temperature than conventionally processed copper rod comprising the steps of:
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a. continuously casting molten copper containing normal impurities into a cast bar at a rate at which said impurities are trapped in solid solution; b. substantially immediately hot-rolling the cast bar in the as-cast condition into continuous rod at a rate at which said impurities are retained in solid solution; c. hot-coiling the continuous rod prior to any substantial cooling thereof from the hot-rolling temperature; and d. gradually cooling the coiled rod to room temperature to permit precipitation of substantially all of said impurities thereby lowering the recrystallization temperature of the rod. - View Dependent Claims (2, 3, 4, 5)
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6. A method of producing an enameled copper magnet wire comprising the steps of:
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a. continuously casting molten copper containing normal impurities into a cast bar at a rate at which said impurities are trapped in solid solution; b. substantially immediately hot-rolling the cast bar in the as-cast condition into continuous rod at a rate at which said impurities are retained in solid solution; c. hot-coiling the continuous rod prior to any substantial cooling thereof from the hot-rolling temperature; d. gradually cooling the coiled rod to room temperature to permit precipitation of substantially all of said impurities thereby lowering the recrystallization temperature of the rod; and e. passing the rod through an annealing tower containing a molten enameling compound at about 500°
F. and therein simultaneously annealing the rod and coating it with the enameling compound. - View Dependent Claims (7, 8, 9, 10)
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Specification
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- Resources
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Current AssigneeSouthwire Company
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Original AssigneeSouthwire Company
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InventorsChia, E. Henry
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Primary Examiner(s)Stallard, W.
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Application NumberUS05/696,801Time in Patent Office566 DaysField of Search148/3, 427/434 D, 427/434 E, 427/435, 164/82US Class Current148/554CPC Class CodesB21B 2001/383 Cladded or coated productsB21B 3/003 Rolling non-ferrous metals ...B22D 11/0602 formed by a casting wheel a...C22F 1/08 of copper or alloys based t...
