CN102199711A - Production method of high-precision ultralong oxygen-free copper strip - Google Patents
Production method of high-precision ultralong oxygen-free copper strip Download PDFInfo
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- CN102199711A CN102199711A CN 201110094479 CN201110094479A CN102199711A CN 102199711 A CN102199711 A CN 102199711A CN 201110094479 CN201110094479 CN 201110094479 CN 201110094479 A CN201110094479 A CN 201110094479A CN 102199711 A CN102199711 A CN 102199711A
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Abstract
The invention relates to a production method of a high-precision ultralong oxygen-free copper strip and belongs to the technical field of oxygen-free copper strip production, processing and manufacturing. The production method of the high-precision ultralong oxygen-free copper strip comprises: (1) selecting electrolytic copper as a raw material, adding the electrolytic copper into a melting furnace, smelting the melting furnace, allowing molten copper to flow into a crystallizer added with an electromagnetic oscillation coil, performing electromagnetic deoxidization of the molten copper and horizontally casting a blank by electromagnetic continuous casting in the electromagnetic continuous casting crystallizer added with the electromagnetic oscillation coil, cooling in the electromagnetic continuous casting crystallizer, crystallizing to form strip copper blanks, and stretching by an ingot leading machine; (2) milling a strip blank by a double-sided miller; (3) performing reversible coarse medium rolling of the copper strip; (4) performing primary trimming by a thick strip longitudinal shearing machine; (5) annealing in a bell type bright annealing furnace; (6) cleaning surface on a thick strip degreasing cleaning line; (7) finely rolling in a four-roller reversible fine rolling machine; (8) annealing a finished product in the bell type bright annealing furnace; (9) cutting the finished product by a thin-strip longitudinal shearing machine; (10) packing in a packaging machine and performing physical and chemical examination; and (11) performing incoming inspection and storing.
Description
Technical field
What the present invention relates to is a kind of high precision overlength oxygen-free copper stripe production method, belongs to the oxygen-free copper stripe process for processing and makes the field.
Background technology
Because copper and copper alloy have many good performances, thereby widely purposes is arranged, as machinery in each department of national economy, electronics, automobile, electric power, communication, the consumption of traffic and light industry department copper coin band is all very big, 2009, the copper coin band statistics production capacity of China is 143.5 ten thousand tons, 900,000 tons of actual production capacities, the rate of capacity utilization are 63%, and the import copper strips is 350,000 tons then, export about 20,000 tons, and the import of high-grade copper coin band also presents the trend that increases progressively at a high speed year by year.And the production capacity of the common product of China is superfluous, and the serious dependence on import of expensive goods shows that China's copper coin band processing industry still lags behind developed country, can not satisfy the relevant industries requirement of develop rapidly.So production high precision copper coin band has just become extremely urgent problem.In recent years, has high heat conduction, high conduction, high fine and close, the oxygenless copper material of low gas content and excellent mechanical properties is the basic material of leading-edge field such as vacuum electronic especially, have only minority producer to adopt the method production of little tonnage vacuum melting in this product scope China, and the product of producing volume is medium and small, the device structure complexity, and maintenance difficulty is big, the shortcoming that yield rate is low is difficult to satisfy the demand of the supporting industry of China.Therefore it is heavy to produce big volume, and the oxygen-free copper stripe of overlength degree has become the emphasis of domestic many copper processing work.
Summary of the invention
The present invention seeks to provides a kind of high precision overlength oxygen-free copper stripe production method at above-mentioned weak point, adopts electromagnetic deoxidization to add the production technique of electromagnetism continuous casting, produces qualified oxygen free copper blank.Guarantee the copper strips oxygen level, the densification of oxygen free copper blank structure, stable performance; monovolume weighs more than 6 tons, and the Ai Baina bell-jar bright annealing oven of the Austrian import of annealing employing, and copper strips carries out non-oxidation annealing in protective atmosphere; annealing back copper strip surface light, the performance stable homogeneous.In follow-up rolling process, adopt advanced in the world hydraulic AGC milling train, because tension closed loop control before and after adopting, significantly reduced the broken belt rate of copper strips, broken belt rate only is 3/1000ths, improved the integrated yield of copper strips greatly, also provide the reliable device guarantee for production overlength oxygen-free copper stripe.
The present invention captures technological difficulties in order to fill up the blank of domestic overlength high precision oxygen-free copper stripe, produces the high precision overlength oxygen-free copper stripe that reaches international standards, and must satisfy following three big key elements:
1: overlength: the copper strips of 0.2 thickness, length surpasses 7000 meters, and 0.1 copper strips surpasses 14000 meters, therefore, the oxygen free copper (TU of production
0) density p=8.95, width 450MM, volume is heavy must to be controlled at more than the 6000KG.
2: high precision: the finished product tolerance, the copper strips tolerance of 0.2 thickness is controlled at ± 0.002MM surface-brightening.
3: oxygen free copper: the Control for Oxygen Content of product is below 5PPM.(PPM-hundred is a concentration very much, and 10
-6)
High precision overlength oxygen-free copper stripe production method of the present invention is to take following technical scheme to realize:
At above technical essential, divide three parts to carry out the analysis of technical scheme to high precision overlength oxygen free copper.
Oxygen free copper aspect, oxygen level be less than 5PPM, ingot casting densification, the soft attitude 105IACS of electric conductivity.
At present, China adopts low capacity induction furnace and water basically in the melting and casting of raw copper base
Flat continuous casting production, copper base oxygen level height, surface quality is poor, internal voids rate height, tissue mostly is thick column
Crystalline substance, physical and mechanical property is poor, and product specification is low.Want to produce high-purity oxygen-free copper stripe, just must be in melting
Stage is produced qualified oxygen free copper blank.Adopt electromagnetic deoxidization to add the production technique of electromagnetism continuous casting, produce qualified oxygen free copper blank.Concrete technical scheme is as follows: transform original horizontal continuous casting crystallizer, install the variable frequency induction coil additional at original crystallizer inwall, add the certain alternating voltage of upper frequency, the one, make liquid copper water before solidifying, under the effect of electromagnetic force, flow fast, carry out the successive induction stirring, make the stronger reductibility dynamic conditions of the inner formation of copper liquid, the impurity in the realization copper liquid and the floating upward quickly of gas, discharge, improve the purity of copper base, and be dissolved in the oxygen element in the copper water, then following reaction takes place in emersion copper water surface and the calcining charcoal that covers the copper water surface:
4C
U+O
2=2C
U2O
C
U2O+C=2C
U+CO
C
U2O+CO=2C
U+CO
2
Thereby the most oxygen elements in the copper water are removed.The 2nd, utilize continuous casting electromagnetic to form inside electromagnetic force at casting billet surface, the static pressure of partial offset copper liquid, thereby the reduction strand begins the force of sliding friction between scull and crystallizer, and the thermograde on copper base top layer, reach and improve crystallization mechanism, thinning microstructure reduces column crystal thickness in the copper base, improve equiaxial crystal ratio, alleviate or eliminates casting billet surface and shake casting flaws such as trace and hot tearing.Under this technology, under the comprehensive action of electromagnetic deoxidization and continuous casting electromagnetic, the density of copper base is promoted significantly, oxygen and other gas contents reduce significantly, have significantly improved the conduction of copper strips, heat conduction, plastic property and intensity, thereby the zero defect production of realization copper base.
High precision overlength oxygen-free copper stripe production method of the present invention is as follows:
, select the starting material electrolytic copper for use by technical papers regulation, electrolytic copper is added melting in the smelting furnace; During melting, the calcining charcoal insulating covering agent that will in smelting furnace, add 50～100 millimeters thickness, and the additional at regular time and quantity starting material electrolytic copper that adds, melting voltage is for exchanging 380-400V, smelting temperature remains on 1180-1250 ℃, the copper water burner hearth bottom chute undercurrent that fusing is good in the fusing furnace chamber goes into to be incubated in the furnace chamber, the temperature of copper liquid is regulated the voltate regulator gear by the PID intelligence instrument in the holding furnace, automatically control to realize temperature, copper liquid keeps casting temp in holding furnace, temperature remains on 1180～1250 ℃, and remain in certain liquid level scope, liquid level is 50～70mm, copper liquid is under the liquid level effect, the crystallizer of electromagnetic oscillation coil is installed in inflow additional, copper liquid carries out electromagnetic deoxidization and the horizontal strand of continuous casting electromagnetic by the continuous casting electromagnetic crystallizer that installs the electromagnetic oscillation coil additional, cool off by continuous casting electromagnetic crystallizer, i.e. cooling for the first time, crystallize into banded copper base, be pulled continuously by the dummy ingot machine, the speed of being pulled is 100～150mm/min, form the oxygen-free copper belt blank of the shape that requires, cooling water tank for the second time is equipped with in the oxygen-free copper belt blank exit, oxygen-free copper belt blank is through cooling water tank water spray cooling for the second time, the flow of water coolant can be regulated, water temperature, hydraulic pressure is monitored in real time, and described coolant water temperature is 18～25 ℃, described cooling water pressure is the 0.8-1.0 MPa.Adopting these control devices, mainly is in order to guarantee Tc, and processing parameter stable is to guarantee quality product.Pulling out by the dummy ingot machine of oxygen-free copper belt blank realizes, the dummy ingot machine draw stop, the anti-time that pushes away is continuously adjustable, will be according to material difference, specification difference, surface quality situation, determine optimization control parameter and in time adjusting, dummy ingot machine PLC time variable control realizes drawing, stops, the anti-do action that pushes away, stops.The specification of the made-up belt of the oxygen free copper of being produced is: 16 millimeters of thickness, and 430 millimeters of width, monovolume is heavy: 6000 kilograms, oxygen level is less than 5PPM, and electric conductivity is greater than 105IACS.
2, made-up belt mills face through two-sided Milling Machine:
The oxygen-free copper belt blank that above-mentioned melting workshop section produces, the oxide compound of some copper of remained on surface, must mill the face operation, remove the zone of oxidation on surface, with the two-sided face machine milling operation of milling of oxygen-free copper belt blank process, the oxygen-free copper belt blank upper and lower surface is respectively milled away 0.5 millimeter, reach any surface finish, do not have the standard of any surface imperfection, the specification of the oxygen-free copper stripe blank of this moment is, 15 millimeters of thickness, 430 millimeters of width.
3, copper strips is reversible rolls in thick:
Oxygen-free copper belt blank after the milling is through a rolling process of the reversible roughing mill of copper strips, and 6 passages are carried out reversible rolling, and oxygen-free copper belt blank is rolled into the thick band of oxygen free copper.Rolling significant parameter is as follows:
Passage: 6
Passage distributes: initial thickness (millimeter) outgoing gauge (millimeter) pass reduction %
15 10 33.3
10 6 40
6 4 33.3
4 3 25
3 2 33.3
2 1.5 25
Rolling load: 8,000 thousand Ns
Roll speed: 250 meters/minute
F strain: 150,000 Ns
Backward pull: 180,000 Ns
The specification of the thick band of oxygen free copper this moment is: thickness: 1.5
± 0.005Millimeter width: 430
-0.1Millimeter
4, thick band slitting line preliminary shearing limit:
Rolling through six passages of roughing mill, the limit portion of oxygen-free copper belt blank is under the effect of pressure rolling, trickle zigzag breach has appearred in limit portion, in order to prevent that the thick band of oxygen free copper pulling force in subsequent handling from breaking, must carry out the thick band of oxygen free copper and cut the limit, both sides are respectively cut 10 millimeters, the trickle breach of limit portion is all cut, the specification of the thick band of oxygen free copper of this moment is: thickness: 1.5 millimeters, width: 410 millimeters, limit portion is intact neat.
5, bell-jar clean annealing furnace annealing:
Because the thickness of oxygen-free copper belt blank has been worked into the thick band of oxygen free copper, total working modulus reaches 90%, and the workhardness of oxygen-free copper belt blank has reached Rockwell more than 450, and the operation of only annealing just can be carried out subsequent job.The bell-jar bright annealing oven, the oxygen-free copper belt blank that will cut exactly behind the limit twists under the protection of protective gas, the operation of annealing, the significant parameter of annealing operation is:
Protective gas: nitrogen (purity 99.95%)
Annealing temperature: 510～530 ℃
Holding temperature: 510～530 ℃
Heat-up time: 180 minutes
Soaking time: 360 minutes
Tapping temperature: less than 30 ℃
Hour air consumption: 5 cubic metres
Because oxygen-free copper belt blank is annealed in the atmosphere of protection of nitrogen gas gas, and oxidizing reaction does not take place, oxygen-free copper belt blank annealing rear surface non-oxidizing bright phenomenon.
6, thick band cleaning by degreasing line surface cleaning:
The back oxygen-free copper belt blank volume of will annealing carries out surface cleaning through blocked up band cleaning by degreasing line, and the water mark lubricating fluid of removing annealing back oxygen-free copper belt blank remained on surface is residual, makes copper strips base any surface finish, does not have any surface imperfection.
7, the reversible finishing mill finish rolling of four rollers:
The oxygen-free copper belt blank volume that cleaned through blocked up band cleaning by degreasing line, through rolling process of the reversible finishing mill of four rollers, four passages rolling is rolled down to 0.1 oxygen-free copper stripe finished product thickness with its thickness
Passage: 4
Passage distributes: initial thickness (millimeter) outgoing gauge (millimeter) pass reduction %
1.5 0.9 40
0.9 0.5 44
0.5 0.25 50
0.25 0.1 60
Rolling load: 3,000 thousand Ns
Roll speed: 400 meters/minute
F strain: 100,000 Ns
Backward pull: 90,000 Ns
The copper strips of this moment rolls whole specification and is: 0.1
± 0.002Millimeter width: 410
-0.1Millimeter
8, bell-jar bright annealing oven finished products:
The bell-jar bright annealing oven, the oxygen-free copper stripe that will cut exactly behind the limit twists under the protection of protective gas, the operation of annealing, the significant parameter of annealing operation is:
Protective gas: nitrogen (purity 99.95%)
Annealing temperature: 450～470 ℃
Holding temperature: 450～470 ℃
Heat-up time: 180 minutes
Soaking time: 360 minutes
Tapping temperature: less than 30 ℃
Hour air consumption: 8 cubic metres
This moment, copper strips reached the end properties state.
9, strip slitting line finished product is cut:
The strip slitting line is exactly the process that oxygen-free copper stripe with wide cut cuts into the narrowband width that finished product requires.This flow process cuts into 40 millimeters * 10 with the oxygen-free copper stripe of 410 millimeters width, and the specification of product is: thickness: 0.1
± 0.002Millimeter, width: 40
-0.05Millimeter
10, packing unit packing and physical and chemical inspection:
Oxygen-free copper stripe sampling the carrying out physical and chemical inspection that branch is cut, the oxygen level of test oxygen-free copper stripe be less than 5PPM, and electric conductivity is greater than 105IACS, thickness deviation 0.1
± 0.002, pack after qualified, in case oxidation and surface contamination.
11, warehouse-in detects, stores:
Detect the weight of oxygen-free copper stripe, the density 8.9 gram/cubic centimetres of oxygen-free copper stripe detect thickness, width, thickness 0.1
± 0.002Millimeter, width 40
-0.05Millimeter calculates the thickness of oxygen-free copper stripe and the photoelectricity note rice device of strip slitting line and compares, and the length of determining copper strips is carried out warehouse storage then greater than ten thousand metres.
High precision overlength oxygen-free copper stripe production method of the present invention adopts electromagnetic mode to carry out the deoxidation of copper liquid, possesses skills equipment, cost, operation, slab quality and material property, many-sided advantage such as production security than additive method.The test-results of the horizontal strand of continuous casting electromagnetic shows, produces oxygen free copper strand, density: 8.94-8.95g/cm with above-mentioned electromagnetic technique
3, copper content 99.97%-99.99%, oxygen level 3-5PPM(10
-6), other chemical ingredientss meet TU
0Standard, the mechanical property of strand is suitable with the preliminary working base material of process hot extrusion, the relative electric conductivity of hard attitude processing material is higher than 100IACS., simultaneously under present melting and casting appointed condition, adopt electromagnetic deoxidization and electromagnetic continuous casting method to carry out result's demonstration that oxygen free copper is produced in batches, this technology need not to cut edge to electrolytic copper, goes beans to handle, improved the utilization ratio and the recovery rate of material, and the TU that produces
OAnd TU
1Oxygen free copper, at physics, chemistry, aspects such as mechanical property all can satisfy the requirement in fields such as electron tube.And, make strand that higher material property arranged owing to improved the strand crystalline state, and the broken belt rate of big volume strand has been dropped to below 3 ‰, improve yield rate greatly, also provide technical guarantee for the overlength copper strips.Guarantee the copper strips oxygen level, the densification of oxygen free copper blank structure, stable performance; monovolume weighs more than 6 tons, and the Ai Baina bell-jar bright annealing oven of the Austrian import of annealing employing, and copper strips carries out non-oxidation annealing in protective atmosphere; annealing back copper strip surface light, the performance stable homogeneous.In follow-up rolling process, adopt advanced in the world hydraulic AGC milling train, because tension closed loop control before and after adopting, significantly reduced the broken belt rate of copper strips, broken belt rate only is 3/1000ths, improved the integrated yield of copper strips greatly, also provide the reliable device guarantee for production overlength oxygen-free copper stripe.
Description of drawings
The invention will be further described below with reference to accompanying drawing:
Fig. 1 is a high precision overlength oxygen-free copper stripe production method process flow sheet of the present invention.
Fig. 2 is the continuous casting electromagnetic crystallizer synoptic diagram of high precision overlength oxygen-free copper stripe production method of the present invention.
Fig. 3 is the continuous casting electromagnetic synoptic diagram of high precision overlength oxygen-free copper stripe production method of the present invention.
Embodiment
With reference to accompanying drawing 1～3, high precision overlength oxygen-free copper stripe production method is as follows:
, select starting material electrolysis copper coin for use by technical papers regulation, electrolytic copper is added melting in the smelting furnace; During melting, the calcining charcoal insulating covering agent that will in smelting furnace, add 50～100 millimeters thickness, and the additional at regular time and quantity starting material electrolytic copper that adds, melting voltage is for exchanging 380-400V, smelting temperature remains on 1180-1250 ℃, the copper liquid that fusing is good in the fusing furnace chamber goes into to be incubated in the furnace chamber from burner hearth bottom chute undercurrent, the temperature of copper liquid is regulated the voltate regulator gear by the PID intelligence instrument in the holding furnace, automatically control to realize temperature, copper liquid keeps casting temp in holding furnace, temperature remains on 1180～1250 ℃, and remain in certain liquid level scope, liquid level is 50～70mm, copper liquid is under the liquid level effect, the crystallizer of electromagnetic oscillation coil is installed in inflow additional, copper liquid carries out electromagnetic deoxidization and the horizontal strand of continuous casting electromagnetic by the continuous casting electromagnetic crystallizer that installs the electromagnetic oscillation coil additional, cool off by continuous casting electromagnetic crystallizer, i.e. cooling for the first time, crystallize into banded copper base, be pulled continuously by the dummy ingot machine, the speed of being pulled is 100～150mm/min, form the oxygen-free copper belt blank of the shape that requires, cooling water tank for the second time is equipped with in the oxygen-free copper belt blank exit, oxygen-free copper belt blank is through cooling water tank water spray cooling for the second time, the flow of water coolant can be regulated, water temperature, hydraulic pressure is monitored in real time, and described coolant water temperature is 18～25 ℃, described cooling water pressure is the 0.8-1.0 MPa.Adopting these control devices, mainly is in order to guarantee Tc, and processing parameter stable is to guarantee quality product.Pulling out by the dummy ingot machine of oxygen-free copper belt blank realizes, the dummy ingot machine draw stop, the anti-time that pushes away is continuously adjustable, will be according to material difference, specification difference, surface quality situation, determine optimization control parameter and in time adjusting, dummy ingot machine PLC time variable control realizes drawing, stops, the anti-do action that pushes away, stops.The specification of the made-up belt of the oxygen free copper of being produced is: 16 millimeters of thickness, and 430 millimeters of width, monovolume is heavy: 6000 kilograms, oxygen level is less than 5PPM, and electric conductivity is greater than 105IACS.
2, made-up belt mills face through two-sided Milling Machine:
The oxygen-free copper belt blank that above-mentioned melting workshop section produces, the oxide compound of some copper of remained on surface, must mill the face operation, remove the zone of oxidation on surface, with the two-sided face machine milling operation of milling of oxygen-free copper belt blank process, the oxygen-free copper belt blank upper and lower surface is respectively milled away 0.5 millimeter, reach any surface finish, do not have the standard of any surface imperfection, the specification of the oxygen-free copper stripe blank of this moment is, 15 millimeters of thickness, 430 millimeters of width.
3, copper strips is reversible rolls in thick:
Oxygen-free copper belt blank after the milling is through a rolling process of the reversible roughing mill of copper strips, and 6 passages are carried out reversible rolling, and 15 millimeters oxygen-free copper belt blanks are rolled down to 1.5 millimeters.Rolling significant parameter is as follows:
Passage: 6
Passage distributes: initial thickness (millimeter) outgoing gauge (millimeter) pass reduction %
15 10 33.3
10 6 40
6 4 33.3
4 3 25
3 2 33.3
2 1.5 25
Rolling load: 8,000 thousand Ns
Roll speed: 250 meters/minute
F strain: 150,000 Ns
Backward pull: 180,000 Ns
The specification of the thick band of oxygen free copper this moment is: thickness: 1.5
± 0.005Millimeter width: 430
-0.1Millimeter
4, thick band slitting line preliminary shearing limit:
Rolling through six passages of roughing mill, the limit portion of oxygen-free copper belt blank is under the effect of pressure rolling, trickle zigzag breach has appearred in limit portion, in order to prevent that the thick band of oxygen free copper pulling force in subsequent handling from breaking, must carry out the thick band of oxygen free copper and cut the limit, both sides are respectively cut 10 millimeters, the trickle breach of limit portion is all cut, the specification of the oxygen-free copper belt blank of this moment is: thickness: 1.5 millimeters, width: 410 millimeters, limit portion is intact neat.
5, bell-jar clean annealing furnace annealing:
Because the thickness of oxygen-free copper belt blank has been worked into 1.5 millimeters the thick band of oxygen free copper by 15 millimeters thickness, total working modulus reaches 90%, and the workhardness of oxygen-free copper belt blank has reached Rockwell more than 450, and the operation of only annealing just can be carried out subsequent job.The bell-jar bright annealing oven, the thick band of oxygen free copper that will cut exactly behind the limit twists under the protection of protective gas, the operation of annealing, the significant parameter of annealing operation is:
Protective gas: nitrogen (purity 99.95%)
Annealing temperature: 510～530 ℃
Holding temperature: 510～530 ℃
Heat-up time: 180 minutes
Soaking time: 360 minutes
Tapping temperature: less than 30 degrees centigrade
Hour air consumption: 5 cubic metres
Because the thick band of oxygen free copper is annealed in the atmosphere of protection of nitrogen gas gas, and oxidizing reaction does not take place, the thick band annealing of oxygen free copper rear surface non-oxidizing bright phenomenon.
6, thick band cleaning by degreasing line surface cleaning:
The thick roll coil of strip of back oxygen free copper of will annealing carries out surface cleaning through blocked up band cleaning by degreasing line, and the water mark lubricating fluid of removing annealing back oxygen-free copper belt blank remained on surface is residual, makes the thick belt surface of oxygen free copper bright and clean, does not have any surface imperfection.
7, the reversible finishing mill finish rolling of four rollers:
The thick roll coil of strip of oxygen free copper oxygen free copper that cleaned through blocked up band cleaning by degreasing line, through rolling process of the reversible finishing mill of four rollers, four passages rolling is rolled down to 0.1 oxygen-free copper stripe finished product thickness with its thickness
Passage: 4
Passage distributes: initial thickness (millimeter) outgoing gauge (millimeter) pass reduction %
1.5 0.9 40
0.9 0.5 44
0.5 0.25 50
0.25 0.1 60
Rolling load: 3,000 thousand Ns
Roll speed: 400 meters/minute
F strain: 100,000 Ns
Backward pull: 90,000 Ns
The copper strips of this moment rolls whole specification and is: 0.1
± 0.002Millimeter width: 410
-0.1Millimeter
8, bell-jar bright annealing oven finished products:
The bell-jar bright annealing oven, the oxygen-free copper stripe that will cut exactly behind the limit twists under the protection of protective gas, the operation of annealing, the significant parameter of annealing operation is:
Protective gas: nitrogen (purity 99.95%)
Annealing temperature: 450～470 ℃
Holding temperature: 450～470 ℃
Heat-up time: 180 minutes
Soaking time: 360 minutes
Tapping temperature: less than 30 ℃
Hour air consumption: 8 cubic metres
This moment, oxygen-free copper stripe reached the end properties state.
9, strip slitting line finished product is cut:
The strip slitting line is exactly the process that oxygen-free copper stripe with wide cut cuts into the narrowband width that finished product requires.This flow process cuts into 40 millimeters * 10 with the oxygen-free copper stripe of 410 millimeters width, and the specification of product is: thickness: 0.1
± 0.002Millimeter, width: 40
-0.05Millimeter
10, packing unit packing and physical and chemical inspection:
Oxygen-free copper stripe sampling the carrying out physical and chemical inspection that branch is cut, the oxygen level of test oxygen-free copper stripe be less than 5PPM, and electric conductivity is greater than 105IACS, thickness deviation 0.1
± 0.002, pack after qualified, in case oxidation and surface contamination.
11, warehouse-in detects, stores:
Detect the weight of oxygen-free copper stripe, the density 8.9 gram/cubic centimetres of oxygen-free copper stripe, thickness 0.1
± 0.002Millimeter, width 40
-0.05Millimeter calculates the thickness of oxygen-free copper stripe and the photoelectricity note rice device of strip slitting line and compares, and the length of determining copper strips is carried out warehouse storage then greater than ten thousand metres.
With reference to accompanying drawing 2,3, continuous casting electromagnetic crystallizer (electromagnetic casting device) synoptic diagram of high precision overlength oxygen-free copper stripe production method of the present invention, continuous casting electromagnetic crystallizer comprises crystallizer housing 1, intermediate frequency power supply, ruhmkorff coil 6(inductor block), electromagnetism oscillator 9, shielding case 13, cooling water tank 8, bed die 11 and cast mechanism.Cast mechanism is made up of tundish 2 and pourer stopper 4.Tundish 2 is by being installed in crystallizer housing 1 top, crystallizer housing 1 bottom is provided with cast gate 3, pourer stopper 4 is housed in the cast gate 3, tundish 2 is communicated with crystallizer housing 1 top by cast gate 3, level sensor 13 is equipped with on crystallizer housing 1 top, level sensor 13 links to each other with supporting PLC controller, supporting PLC controller is obtained liquid level signal in the crystallizer housing according to level sensor 13, control pourer stopper 4 upper and lower position in cast gate, control cast gate and open size, metal fluid column 5 is highly remained unchanged.A key of electromagnetic casting success or failure is that pouring speed is coordinated mutually with casting speed (casting speed), and metal fluid column 5 is highly remained unchanged.For reaching the general way that adopts with liquid surface height sensor 12 feedback control pouring speeds of this purpose.
Ruhmkorff coil 6(inductor block is equipped with on crystallizer housing 1 top), electromagnetism oscillator 9 and ruhmkorff coil 6(inductor block) link to each other, ruhmkorff coil 6(inductor block) is connected with intermediate frequency power supply, ruhmkorff coil 6(inductor block) be to be that the fine copper coiling of rectangular hollow forms with the cross section, ruhmkorff coil 6(inductor block) hollow bulb is connected with recirculated cooling water, i.e. cooling for the first time.Ruhmkorff coil 6(inductor block) makes and have a down dip.In crystallizer housing 1 upper end shielding case 14 is housed, this is in order to make magnetic pressure that metal fluid column 5 tops are subjected to less than the below, to coordinate to improve the molten metal post shapes and make it stable with shielding case 14.Shielding case 14 usefulness stainless steel coilings form, and because of shielding case in the castingprocesses also needs heat radiation, manage in its surface current water cooling.Described intermediate frequency power supply power frequency is 2000～3000Hz.
In crystallizer housing 1 bottom cooling water tank 8 and shower are housed, by cooling water tank 8 and shower to crystallizing into banded copper base, water spray cooling, i.e. cooling for the second time.
In crystallizer housing 1 bottom bed die 11 is housed, bed die 11 links to each other with tractor by ingot-guiding head 12.
Continuous casting electromagnetic crystallizer (electromagnetic casting device) continuous casting electromagnetic process is as follows: at first the last plane with bed die 11 edges moves to continuous casting electromagnetic crystallizer half eminence, starts intermediate frequency power supply then; Cast; Fixing output rating when the copper liquid level reaches certain value, the water spray cooling, bed die moves down with certain speed.Copper liquid carries out electromagnetic deoxidization and the horizontal strand of continuous casting electromagnetic by the continuous casting electromagnetic crystallizer that installs the electromagnetic oscillation coil additional, crystallize into banded copper base by continuous casting electromagnetic crystallizer cooling (once cooling), water spray cooling (secondary cooling), banded copper base 10 moves down with certain speed with bed die 11 bindings, is pulled continuously by the dummy ingot machine.The electromagnetic casting key of success is to make the metal fluid column stable and make it highly keep certain.For reaching this purpose, the choose reasonable processing parameter is crucial.Most important parameter has: power frequency, strength of current, casting speed, water spray cooling intensity.Improve power frequency and can reduce flowing that induction stirring causes in the metal fluid column, but, be unfavorable for improving casting speed, waste electric energy meaninglessly along with the increase induction heating effect of power frequency increases rapidly.In the electromagnetic casting of copper, power frequency is got 2000～3000Hz.Strength of current is to decide according to needed metal fluid column 5 height, and metal fluid column 5 height are spent low, and the edge of metal fluid column 5 end faces inwardly shrinks, and castingprocesses is wayward; Metal fluid column 5 is too high, also causes waste of electric energy.It is suitable that metal fluid column 5 highly is controlled at 30～50mm, and at this moment needed strength of current is 3500～5000A.Casting speed becomes with the water spray cooling intensity, adopts the cooling of recirculated water water spray, and electromagnetic casting speed is 100～150mm/min.
Adopt 600 tons of high precision overlength oxygen-free copper stripe production method test manufacture oxygen free copper blanks of the present invention, raw materials for production are intelligence CCC electrolytic copper, and smelting furnace is the casting of 3 tons of horizontal casting stove double fluids, strand 450 X 16MM, and the continuous casting electromagnetic crystallizer shake is 0-5H frequently
Z, pulling rate 100-150MM/MIN, equipment operational excellence in the production process, technological operation is stable, and the oxygen free copper base does not have casting flaw.
Solidify thermometric and adopt the armouring nickelchromium-nickelsiliconthermocouple, composition detection adopts chemical analysis (to copper content) plasma emission spectrum (to other nonoxygen element content) and nitrogen oxygen analyzer (to oxygen level) respectively, mechanical property adopts conventional tension testing machine, all the copper base carries out the composition analyzing and testing, the result shows, [C
U] 〉=99.97%, [O]=3-5 X 10
-6(PPM), all the other compositions all meet TU
0Standard, to copper base crystal structure, physics and chemistry and mechanical property are inspected by random samples, and the result shows, equiaxial crystal ratio 〉=90%, surperficial flawless and shake trace, any surface finish, yield strength 51MPa, tensile strength 155MPa, unit elongation: 45%, constriction rate 70%(mean value)
Produce oxygen-free copper belt blank through high precision overlength oxygen-free copper stripe production method of the present invention, through rolling be that microwave magnetron (electrovacuum) is used high-precision copper strap, detect through Japanese Matsushita Electric Industrial company, under 1000 degrees centigrade temperature, free air delivery under the vacuum condition only is 40% of a common oxygen free copper like product, equiaxed grain structure is than the obvious refinement of the latter, and the grain structure of while continuous casting electromagnetic oxygenless copper material does not have after thermal treatment obviously grows up, and the relative electric conductivity of hard attitude worked structure reaches 101%IACS.Reach the standard of its company fully.By above technology, high precision overlength oxygen-free copper stripe production method of the present invention is successfully produced oxygen level less than 5PPM, thickness deviation is controlled at ± and 0.002, length reaches 7000 meters high precision overlength oxygen-free copper stripe, and economic benefit is very considerable, fills up the blank of domestic overlength high precision oxygen-free copper stripe, capture technological difficulties, the high precision overlength oxygen-free copper stripe that production reaches international standards for country has saved a large amount of foreign exchanges, has improved the influence power of China copper processing enterprise.
Claims (4)
1. high precision overlength oxygen-free copper stripe production method, its feature is as follows:
(1) selects the starting material electrolytic copper for use, electrolytic copper is added melting in the smelting furnace; During melting, the calcining charcoal insulating covering agent that will in smelting furnace, add 50～100 millimeters thickness, and the additional at regular time and quantity starting material electrolytic copper that adds, melting voltage is for exchanging 380-400V, smelting temperature remains on 1180-1250 ℃, the copper liquid that fusing is good in the fusing furnace chamber goes into to be incubated in the furnace chamber from burner hearth bottom chute undercurrent, the temperature of copper liquid is regulated the voltate regulator gear by the PID intelligence instrument in the holding furnace, automatically control to realize temperature, copper liquid keeps casting temp in holding furnace, temperature remains on 1180～1250 ℃, and remain in the liquid level scope, liquid level is 50～70mm, copper liquid is under the liquid level effect, the crystallizer of electromagnetic oscillation coil is installed in inflow additional, copper liquid carries out electromagnetic deoxidization and the horizontal strand of continuous casting electromagnetic by the continuous casting electromagnetic crystallizer that installs the electromagnetic oscillation coil additional, cool off by continuous casting electromagnetic crystallizer, i.e. cooling for the first time, crystallize into banded copper base, be pulled continuously by the dummy ingot machine, the speed of being pulled is 100～150mm/min, form the oxygen-free copper belt blank of the shape that requires, cooling water tank for the second time is equipped with in the oxygen-free copper belt blank exit, oxygen-free copper belt blank is through cooling water tank water spray cooling for the second time, and the flow of water coolant can be regulated, water temperature, hydraulic pressure is monitored in real time, described coolant water temperature is 18～25 ℃, described cooling water pressure is the 0.8-1.0 MPa, and pulling out by the dummy ingot machine of oxygen-free copper belt blank made-up belt realizes that the dummy ingot machine draws and stops, the anti-time that pushes away is continuously adjustable, the machine PLC time variable control that is pulled realizes drawing, stop, counter pushing away, the do action that stops;
(2) made-up belt mills face through two-sided Milling Machine:
The oxygen-free copper belt blank that above-mentioned melting workshop section produces, the oxide compound of some copper of remained on surface, must mill the face operation, remove the zone of oxidation on surface, with the two-sided face machine milling operation of milling of oxygen-free copper belt blank process, the oxygen-free copper belt blank upper and lower surface is respectively milled away 0.5 millimeter, reach any surface finish, do not have the standard of any surface imperfection;
(3) copper strips is reversible rolls in thick:
Oxygen-free copper belt blank after the milling is through a rolling process of the reversible roughing mill of copper strips, and 6 passages are carried out reversible rolling, and oxygen-free copper belt blank is rolled into the thick band of oxygen free copper;
Rolling load wherein: 8,000 thousand Ns, roll speed: 250 meters/minute, F strain: 150,000 Ns
Backward pull: 180,000 Ns;
(4) thick band slitting line preliminary shearing limit:
Rolling through six passages of roughing mill, the limit portion of oxygen-free copper belt blank is under the effect of pressure rolling, trickle zigzag breach has appearred in limit portion, break in order to prevent oxygen-free copper belt blank pulling force in subsequent handling, must carry out the thick band of oxygen free copper and cut the limit, both sides are respectively cut 10 millimeters, and the trickle breach of limit portion is all cut, and limit portion is intact neat;
(5) bell-jar clean annealing furnace annealing:
Because the thickness of oxygen-free copper belt blank has been worked into the thickness of the thick band of oxygen free copper; total working modulus reaches 90%; the workhardness of oxygen-free copper belt blank has reached Rockwell more than 450; the operation of only annealing; just can carry out subsequent job, the bell-jar bright annealing oven, the thick band of oxygen free copper that will cut exactly behind the limit twists under the protection of protective gas; the operation of annealing, the significant parameter of annealing operation is:
Protective gas: nitrogen, purity 99.95%,
Annealing temperature: 510～530 ℃
Holding temperature: 510～530 ℃
Heat-up time: 180 minutes
Soaking time: 360 minutes
Tapping temperature: less than 30 ℃
Hour air consumption: 5 cubic metres
Because the thick band of oxygen free copper is annealed in the atmosphere of protection of nitrogen gas gas, and oxidizing reaction does not take place, the thick band annealing of oxygen free copper rear surface non-oxidizing bright phenomenon;
(6) thick band cleaning by degreasing line surface cleaning:
The thick roll coil of strip of back oxygen free copper of will annealing carries out surface cleaning through blocked up band cleaning by degreasing line, and the water mark lubricating fluid of removing annealing back oxygen-free copper belt blank remained on surface is residual, makes the thick belt surface of oxygen free copper bright and clean, does not have any surface imperfection:
The reversible finishing mill finish rolling of (7) four rollers:
The thick roll coil of strip of oxygen free copper that cleaned through blocked up band cleaning by degreasing line, through rolling process of the reversible finishing mill of four rollers, four passages rolling is rolled down to the oxygen-free copper stripe finished product thickness with its thick tape thickness of oxygen free copper;
Rolling load wherein: 3,000 thousand Ns, roll speed: 400 meters/minute, F strain: 100,000 Ns
Backward pull: 90,000 Ns;
(8) bell-jar bright annealing oven finished products:
The bell-jar bright annealing oven, the oxygen-free copper stripe that will cut exactly behind the limit twists under the protection of protective gas, the operation of annealing, the significant parameter of annealing operation is:
Protective gas: nitrogen, purity 99.95%, annealing temperature: 450～470 ℃, holding temperature: 450～470 ℃, heat-up time: 180 minutes, soaking time: 360 minutes, tapping temperature: less than 30 ℃, hour air consumption: 8 cubic metres,
This moment, oxygen-free copper stripe reached the end properties state;
(9) strip slitting line finished product is cut:
The strip slitting line is exactly the process that oxygen-free copper stripe with wide cut cuts into the narrowband width that finished product requires;
(10) packing unit packing and physical and chemical inspection:
Oxygen-free copper stripe sampling the carrying out physical and chemical inspection that branch is cut, the oxygen level of test oxygen-free copper stripe be less than 5PPM, and electric conductivity is greater than 105IACS, thickness deviation 0.1
± 0.002, pack after qualified, in case oxidation and surface contamination;
(11) warehouse-in detects, stores:
Detect weight, thickness, the width of oxygen-free copper stripe, the density 8.9 gram/cubic centimetres of oxygen-free copper stripe detect thickness, width, calculate the thickness of oxygen-free copper stripe and the photoelectricity note rice device of strip slitting line and compare, the length of determining copper strips is carried out warehouse storage then greater than ten thousand metres.
According to right with requiring 1 described high precision overlength oxygen-free copper stripe production method, it is characterized in that oxygen-free copper belt blank oxygen level that operation (1) produced less than 5PPM, electric conductivity is greater than 105IACS.
According to right with requiring 1 described high precision overlength oxygen-free copper stripe production method, it is characterized in that continuous casting electromagnetic crystallizer comprises the crystallizer housing, intermediate frequency power supply, ruhmkorff coil, the electromagnetism oscillator, shielding case, cooling water tank, bed die and cast mechanism, cast mechanism is made up of tundish and pourer stopper, tundish is by being installed in crystallizer housing top, the crystallizer housing bottom is provided with cast gate, pourer stopper is housed in the cast gate, tundish is communicated with crystallizer housing top by cast gate, and level sensor is equipped with on crystallizer housing top, and level sensor links to each other with supporting PLC controller, supporting PLC controller is obtained liquid level signal in the crystallizer housing according to level sensor, control pourer stopper in cast gate on, upper/lower positions is controlled cast gate and is opened size, and the metal liquid-column height is remained unchanged;
Ruhmkorff coil is equipped with on crystallizer housing top, the electromagnetism oscillator links to each other with ruhmkorff coil, ruhmkorff coil is connected with intermediate frequency power supply, ruhmkorff coil is to be that the fine copper coiling of rectangular hollow forms with the cross section, the ruhmkorff coil hollow bulb is connected with recirculated cooling water, i.e. cooling for the first time, ruhmkorff coil are made and are had a down dip, and in crystallizer housing upper end shielding case are housed;
In the crystallizer lower housing portion cooling water tank and shower are housed, by cooling water tank and shower to crystallizing into banded copper base, water spray cooling, i.e. cooling for the second time;
At the crystallizer housing bottom bed die is housed, bed die links to each other with tractor by ingot-guiding head.
According to right with requiring 1 described high precision overlength oxygen-free copper stripe production method, the intermediate frequency power supply power frequency that it is characterized in that described continuous casting electromagnetic crystallizer is 2000～3000Hz.
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