CN102321810A - Method for preparing high-electric-conductivity pure copper strips for transformer - Google Patents
Method for preparing high-electric-conductivity pure copper strips for transformer Download PDFInfo
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- CN102321810A CN102321810A CN201110299372A CN201110299372A CN102321810A CN 102321810 A CN102321810 A CN 102321810A CN 201110299372 A CN201110299372 A CN 201110299372A CN 201110299372 A CN201110299372 A CN 201110299372A CN 102321810 A CN102321810 A CN 102321810A
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Abstract
The invention discloses a method for preparing high-electric-conductivity pure copper strips for a transformer, belonging to the field of material manufacturing, for solving problems of longer preparation process and expensive required devices of the high-electric-conductivity pure copper strips in the prior art. The preparation method of the high-electric-conductivity pure copper strips for the transformer comprises the following steps of: distributing materials, melting materials, adding a copper phosphor intermediate alloy, and covering dry charcoal on liquid raw materials; transferring the liquid raw materials covered with dry charcoal in a heat preservation furnace at the temperature of 1180 DEG C-1280 DEG C, and keeping the temperature for 25-30 minutes; then carrying out horizontal continuous casting at the casting temperature from 1100 DEG C to 1200 DEG C by adopting pulling, stopping and returning technologies; and carrying out face milling, intermediate annealing after cold rolling and cogging, as well as roughing and reduction, secondary intermediate annealing, surface cleaning and passivation, cold finishing rolling, low-temperature thermal treatment for finished products, surface cleaning and passivation, stretch bending leveling, thus the required high-electric-conductivity pure copper strips are obtained. According to the invention, the existing uniform annealing working procedure is omitted, expensive devices are not required to be purchased additionally, the technology complexity is lowered, and the cost is lowered.
Description
Technical field
The present invention relates to a kind of preparation method of copper strips, relate in particular to the preparation method of a kind of X-former with high conductivity fine copper band.
Background technology
The fine copper band that is applied in the prior art, owing to be not very strict to using environmental restraint, so the parameters index request of fine copper band is also very low.For example conventional fine copper band, its to electric conductivity and no requirement (NR), the burr height on the fine copper band only required not have macroscopic burr get final product, to the length and the also equal no requirement (NR) of width of fine copper band.
Yet, in more special occasion, for example in the X-former, for satisfying its specific function, for example requirement such as superpower, High Accuracy Control, its parameters to the major parts fine copper band that constitutes X-former also becomes very harsh accordingly.Making the very harsh high conductivity fine copper band of this kind parameters index request is a problem that needs to be resolved hurrily at present.
Summary of the invention
Technical problem to be solved by this invention is, to the above-mentioned deficiency of prior art, propose a kind of technology simple, need not the large-scale redevelopment existing installation and practice thrift the preparation method of the X-former of cost with high conductivity fine copper band.
Above-mentioned purpose of the present invention is to be able to implement through following technical scheme: a kind of X-former is characterized in that with the preparation method of high conductivity fine copper band this method may further comprise the steps:
S1: cathode copper is put into the inherent temperature of smelting furnace is 1150 ℃-1300 ℃ and melts, treat that raw materials melt becomes liquid state after, add copper phosphorus master alloy and carry out degasification, add-on is the 0.01%-0.05% of cathode copper weight;
S2: after the raw material stirring after the above-mentioned fusion dragged for slag, cover one deck exsiccant charcoal on liquid level, the composition of sampling analysis adjustment then, composition meet and cover one deck exsiccant charcoal once more on liquid level after prescription requires; Change in the holding furnace then and be incubated, the holding furnace temperature is 1180 ℃-1280 ℃, and soaking time is 25-30 minute;
S3: the copper liquid after the above-mentioned insulation is carried out being 1100 ℃-1200 ℃ in temperature carry out horizontal casting; Wherein adopt and draw 13.5 to 15 millimeters, stop 2 to 3 seconds, return and push away 2 to 4 millimeters; Casting speed is 175 to 180 mm/min; The made-up belt temperature out is 500 ℃, and obtaining sectional dimension is 10 * 300 millimeters to 12 * 350 millimeters, and length is 50 to 55 meters fine copper roll coil of strip base;
S4: the above-mentioned fine copper roll coil of strip base that obtains is carried out off-line mill face; Direct cold rolling cogging then; Fine copper band after the cold rolling cogging is put into the bell jar stove carry out the process annealing first time, the temperature of process annealing for the first time is 350 ℃-400 ℃, soaking time 5 hours-6 hours; Obtain finished product through roughing attenuate, process annealing for the second time, surface cleaning passivation, cold finish rolling, low-temperature heat treatment, surface cleaning passivation, stretch bending leveling at last.
In the preparation method of above-mentioned X-former with high conductivity fine copper band, the requirement of the mass percent of the composition of cathode copper is among the step S1: copper>=99.9%, phosphorus≤0.003%, iron≤0.005%.
In the preparation method of above-mentioned X-former with high conductivity fine copper band, the composition and the quality per distribution ratio thereof of the copper phosphorus master alloy that adds among the step S1 are: phosphorus: 8.0%-9.0%; Iron: 0.15%; Copper surplus; Copper phosphorus master alloy is Powdered or molten.Because founding is that fine copper is air-breathing especially easily, must add copper phosphorus master alloy and carry out degasification, still residual phosphorus amount has a negative impact to the electric conductivity of fine copper band.The add-on of the copper phosphorus master alloy that the present invention adopts is the 0.01%-0.05% of cathode copper weight; Be preferably 0.02%-0.03%; Can not produce bigger influence to the electric conductivity of fine copper band; Phosphorus and iron form the physical strength that the Fe2P deposition not only can be improved the fine copper band in this copper copper phosphorus master alloy alloy in addition, and its electric conductivity can not descend a lot.Can make the composition in the copper tissue obtain better refinement with Powdered or molten adding copper copper phosphorus master alloy alloy, increase interfacial energy, reduce casting flaw, the over-all properties of fine copper carries product is significantly improved.
In the preparation method of above-mentioned X-former,, adopt wooden stick or sticking plaster to stir liquid raw material among the step S2 as preferably with high conductivity fine copper band; The annealing temperature of process annealing for the second time is 300 ℃-350 ℃ among the step S4, and soaking time is 3 hours-4 hours; The stretch bending leveling is to roll the fine copper band through a pair of smoother roller among the step S4.
In sum, the present invention has the following advantages:
1, the technological process of production of the present invention is lacked, need not homogenizing annealing, and cold working rate is bigger, and the process annealing number of times is also less.
2, the present invention makes fine copper band inside can not suck air through adopting the method that adds copper phosphorus master alloy and cover charcoal.Preparing method of the present invention need not to transform in a large number existing installation, need not to buy expensive hot rolling cogging equipment, practices thrift cost.
Embodiment
The present invention makes required high conductivity fine copper band through following steps.
Embodiment 1
At first need the proportioning raw material,, therefore when the proportioning raw material, need strict control can influence the impurity elements such as phosphorus, iron of fine copper band electric conductivity because the present invention requires the electric conductivity of final cost copper strips need be more than 98%.In the present embodiment, the copper content of raw material is 99.9%, and phosphorus content is 0.003%, and iron level is 0.005%.
Confirm after the proportioning raw materials raw material to be sent into melt in furnace.In atmosphere, the furnace charge temperature of fusion is warmed up to 1150 ℃ to 1300 ℃.Highly purified copper sucks air in the raw material in melting process easily, cause the inner air filled cavity that forms of raw material, therefore in the raw material that has melted, needs to add in the middle of the alloy.In the present embodiment, master alloy is chosen copper phosphorus master alloy (phosphorus: 8.0%; Iron: 0.15%; Copper surplus).Copper phosphorus master alloy content is 0.02% to 0.03%, after raw material all is molten into liquid state, pulverous copper phosphorus master alloy is added in the raw material.
Stir liquid raw material with wooden stick or sticking plaster, make copper phosphorus master alloy fully, incorporate in the liquid raw material equably, and further discharge air remaining in the liquid raw material.Stirring is dragged for behind the slag in order to prevent that air from getting in the liquid raw material once more, is covered in the exsiccant charcoal on the liquid level, then sampling analysis.In the present embodiment, adopt and directly read spectrum analyzer analysis.After each composition ratio of treating sample meets the requirements, liquid raw material is changed in the holding furnace, still need adopt exsiccant charcoal to be covered in liquid level in order to prevent the air admission liquid raw material this moment.The temperature of liquid raw material remains on 1200 ℃ to 1250 ℃ in the holding furnace.Soaking time 25 to 30 minutes.
Carry out horizontal casting after the insulation, casting temp is 1100 ℃ to 1200 ℃, adopt and to draw 13.5 millimeters, stop 2 seconds, return and push away 2 millimeters technology, casting speed is 175mm/min, the made-up belt temperature out is 500 ℃, the band sectional dimension is 10 * 300 millimeters, long 50 meters of the roll coil of strip.
Then adopt off-line to mill face machine off-line the above-mentioned roll coil of strip and mill face, every facing cut goes 0.6 millimeter.Mill direct cold rolling cogging behind the face, then in the bell jar stove, carry out 350 ℃, 5 hours process annealing first of insulation, on the reversible roughing mill of four rollers, be rolled to 3 mm thick again, in the bell jar stove, carry out 300 ℃ again, be incubated 3 hours last process annealing with 6 times.Annealing back is cleaned on the degreasing pickling line, clean the back on cold finishing mill cold finish rolling to keeping 1.5 millimeters of thickness on file.The low-temperature heat treatment of in the bell jar stove, carrying out after the cold finish rolling 200 ℃, 2 hours improves its comprehensive mechanical performance, on degreasing acid wash passivation line, carries out surface treatment again.Utilize a pair of smoother roller that the fine copper band after shearing is rolled to guarantee that limit portion does not have burr after the shearing.
Embodiment 2
The proportioning raw material, in the present embodiment, the copper content of raw material is 99.93%, and phosphorus content is 0.002%, and iron level is 0.003%.
Confirm after the proportioning raw materials raw material to be sent into melt in furnace.In atmosphere, the furnace charge temperature of fusion is warmed up to 1200 ℃ to 1300 ℃.Highly purified copper sucks air in the raw material in melting process easily, cause the inner air filled cavity that forms of raw material, therefore in the raw material that has melted, needs to add master alloy.In the present embodiment, master alloy is chosen copper phosphorus master alloy (phosphorus: 9.0%; Iron: 0.15%; Copper surplus).Copper phosphorus master alloy content is 0.01%, and elder generation is being added to it in liquid raw material after copper phosphorus master alloy is heated into molten state.
Stir liquid raw material with wooden stick or sticking plaster, make copper copper phosphorus master alloy fully, incorporate in the liquid raw material equably, and further discharge air remaining in the liquid raw material.Stirring is dragged for behind the slag in order to prevent that air from getting in the liquid raw material once more, is covered in the exsiccant charcoal on the liquid level, then sampling analysis.In the present embodiment, adopt and directly read spectrum analyzer analysis.After each composition ratio of treating sample meets the requirements, liquid raw material is changed in the holding furnace, still need adopt exsiccant charcoal to be covered in liquid level in order to prevent the air admission liquid raw material this moment.The temperature of liquid raw material remains on 1180 ℃ to 1280 ℃ in the holding furnace.Soaking time 25 to 30 minutes.
Carry out horizontal casting after the insulation, casting temp is 1150 ℃, adopt and to draw 15 millimeters, stop 3 seconds, return and push away 4 millimeters technology, casting speed is 180mm/min, the made-up belt temperature out is 500 ℃, the band sectional dimension is 12 * 350 millimeters, long 55 meters of the roll coil of strip.
Then adopt off-line to mill face machine off-line the above-mentioned roll coil of strip and mill face, every facing cut goes 0.9 millimeter.Mill direct cold rolling cogging behind the face, then in the bell jar stove, carry out 400 ℃, 6 hours process annealing first of insulation, on the reversible roughing mill of four rollers, be rolled to 2.5 mm thick again, in the bell jar stove, carry out 350 ℃ again, be incubated 4 hours last process annealing with 7 times.Annealing back is cleaned on the degreasing pickling line, clean the back on cold finishing mill cold finish rolling to keeping 0.8 millimeter of thickness on file.The low-temperature heat treatment of in the bell jar stove, carrying out after the cold finish rolling 150 ℃, 3 hours improves its comprehensive mechanical performance, on degreasing acid wash passivation line, carries out surface treatment again.Utilize a pair of smoother roller that the fine copper band after shearing is rolled to guarantee that limit portion does not have burr after the shearing.
Embodiments of the invention gained sample is carried out Performance Detection:
Adopt State Standard of the People's Republic of China GB/T228-2002 metallic substance tensile test at room temperature method to obtain.Tensile testing machine is WA-20 and the WA-50MC electric-liquid type universal testing machine that Shen, Shanghai City force tester factory makes, and class of precision is the I level.
Hardness The data State Standard of the People's Republic of China GB/T4340.1-1999 Vickers Hardness Test method obtains.Hardness is counted Laizhou City, Shandong trier head factory and is made little load Vickers hardness tester, model HV-5.
X-former relatively sees the following form 1 with the technical indicator of the high conductivity fine copper band that the key technical indexes requirement and the various embodiments of the present invention of high conductivity fine copper band electric conductivity and mechanical property are produced:
Table 1: X-former is with the key technical indexes of high conductivity fine copper electric conductivity and mechanical property
Can find out that from above-mentioned table 1 the high conductivity fine copper band that utilizes the present invention to process meets the technical requirements of X-former with high conductivity fine copper band fully.And technology of the present invention is more simple, can directly utilize existing technical equipment, need not to buy other hot rolling cogging equipment, practices thrift cost.
Specific embodiment described herein only is that the present invention's spirit is illustrated.Person of ordinary skill in the field of the present invention can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present invention or surmount the defined scope of appended claims.
Claims (6)
1. an X-former is characterized in that with the preparation method of high conductivity fine copper band this method may further comprise the steps:
S1: cathode copper is put into the inherent temperature of smelting furnace is 1150 ℃-1300 ℃ and melts, treat that raw materials melt becomes liquid state after, add copper phosphorus master alloy and carry out degasification, add-on is the 0.01%-0.05% of cathode copper weight;
S2: after the raw material stirring after the above-mentioned fusion dragged for slag, cover one deck exsiccant charcoal on liquid level, the composition of sampling analysis adjustment then, composition meet and cover one deck exsiccant charcoal once more on liquid level after prescription requires; Change in the holding furnace then and be incubated, the holding furnace temperature is 1180 ℃-1280 ℃, and soaking time is 25-30 minute;
S3: the copper liquid after the above-mentioned insulation is carried out being 1100 ℃-1200 ℃ in temperature carry out horizontal casting; Wherein adopt and draw 13.5 to 15 millimeters, stop 2 to 3 seconds, return and push away 2 to 4 millimeters; Casting speed is 175 to 180 mm/min; The made-up belt temperature out is 500 ℃, and obtaining sectional dimension is 10 * 300 millimeters to 12 * 350 millimeters, and length is 50 to 55 meters fine copper roll coil of strip base;
S4: the above-mentioned fine copper roll coil of strip base that obtains is carried out off-line mill face; Direct cold rolling cogging then; Fine copper band after the cold rolling cogging is put into the bell jar stove carry out the process annealing first time, the temperature of process annealing for the first time is 350 ℃-400 ℃, soaking time 5 hours-6 hours; Obtain finished product through roughing attenuate, process annealing for the second time, surface cleaning passivation, cold finish rolling, low-temperature heat treatment, surface cleaning passivation, stretch bending leveling at last.
2. X-former according to claim 1 is characterized in that with the preparation method of high conductivity fine copper band the requirement of the mass percent of the composition of cathode copper is among the step S1: copper>=99.9%, phosphorus≤0.003%, iron≤0.005%.
3. X-former according to claim 1 and 2 is characterized in that with the preparation method of high conductivity fine copper band the composition and the quality per distribution ratio thereof of the copper phosphorus master alloy that adds among the step S1 are: phosphorus: 8.0%-9.0%; Iron: 0.15%; Copper surplus; Copper phosphorus master alloy is Powdered or molten.
4. X-former according to claim 1 is characterized in that with the preparation method of high conductivity fine copper band, adopts wooden stick or sticking plaster to stir liquid raw material among the step S2.
5. X-former according to claim 1 is characterized in that with the preparation method of high conductivity fine copper band the annealing temperature of process annealing for the second time is 300 ℃-350 ℃ among the step S4, and soaking time is 3 hours-4 hours.
According to claim 1 or 5 described X-formers with the preparation method of high conductivity fine copper band, it is characterized in that the stretch bending leveling is to roll the fine copper band through a pair of smoother roller among the step S4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2011102993725A CN102321810B (en) | 2011-09-25 | 2011-09-25 | Method for preparing high-electric-conductivity pure copper strips for transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102993725A CN102321810B (en) | 2011-09-25 | 2011-09-25 | Method for preparing high-electric-conductivity pure copper strips for transformer |
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| CN102321810A true CN102321810A (en) | 2012-01-18 |
| CN102321810B CN102321810B (en) | 2013-11-06 |
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| CN2011102993725A Expired - Fee Related CN102321810B (en) | 2011-09-25 | 2011-09-25 | Method for preparing high-electric-conductivity pure copper strips for transformer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105170685A (en) * | 2015-06-25 | 2015-12-23 | 中色科技股份有限公司 | Hot-rolled copper strip billet production process without surface milling |
| CN105603201A (en) * | 2016-03-21 | 2016-05-25 | 江西保太有色金属集团有限公司 | Impure red copper refining method through dumping, transferring, melting and casting |
| CN109881131A (en) * | 2019-03-29 | 2019-06-14 | 安徽众源新材料股份有限公司 | A kind of red copper homogenization processing technology |
| CN113774229A (en) * | 2021-09-08 | 2021-12-10 | 虹华科技股份有限公司 | Processing technology of high-strength high-conductivity high-purity copper wire |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1438340A (en) * | 2003-03-14 | 2003-08-27 | 宁波博威集团有限公司 | High-zinc-tin-manganese-chromium prass-alloy and its wire material making process |
| CN101580922A (en) * | 2009-06-21 | 2009-11-18 | 宁波市鄞州锡青铜带制品有限公司 | Method for producing tin phosphorus bronze band by direct cold cogging |
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- 2011-09-25 CN CN2011102993725A patent/CN102321810B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1438340A (en) * | 2003-03-14 | 2003-08-27 | 宁波博威集团有限公司 | High-zinc-tin-manganese-chromium prass-alloy and its wire material making process |
| CN101580922A (en) * | 2009-06-21 | 2009-11-18 | 宁波市鄞州锡青铜带制品有限公司 | Method for producing tin phosphorus bronze band by direct cold cogging |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105170685A (en) * | 2015-06-25 | 2015-12-23 | 中色科技股份有限公司 | Hot-rolled copper strip billet production process without surface milling |
| CN105603201A (en) * | 2016-03-21 | 2016-05-25 | 江西保太有色金属集团有限公司 | Impure red copper refining method through dumping, transferring, melting and casting |
| CN109881131A (en) * | 2019-03-29 | 2019-06-14 | 安徽众源新材料股份有限公司 | A kind of red copper homogenization processing technology |
| CN113774229A (en) * | 2021-09-08 | 2021-12-10 | 虹华科技股份有限公司 | Processing technology of high-strength high-conductivity high-purity copper wire |
| CN113774229B (en) * | 2021-09-08 | 2023-11-28 | 虹华科技股份有限公司 | Processing technology of high-strength high-conductivity high-purity copper wire |
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| CN102321810B (en) | 2013-11-06 |
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