CN103962409B - The manufacture method of a kind of copper cash - Google Patents
The manufacture method of a kind of copper cash Download PDFInfo
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- CN103962409B CN103962409B CN201410214410.6A CN201410214410A CN103962409B CN 103962409 B CN103962409 B CN 103962409B CN 201410214410 A CN201410214410 A CN 201410214410A CN 103962409 B CN103962409 B CN 103962409B
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Abstract
The present invention discloses a kind of copper cash manufacture method. The particularly a kind of method of manufacture copper cash not changing its material purity in manufactured copper line process. The technical scheme adopted is, copper coin raw material is carried out sorting, the copper coin raw material having lamination defect is carried out dense structure's process, to copper coin raw material, cut into the copper bar of design width, copper bar is carried out special-shaped rule circle processing, make the copper bar of circular section, to copper bar, after carrying out surface treatment, carry out continuously extruded, make dish round copper wire, to dish round copper wire, the deformation rate shaping according to the copper wire diameter of design and a drawing, iterative cycles carry out that drawing is shaping and the annealing heat treatment step of drawing process, obtain copper cash product. Provided by the invention is a kind of production efficiency height, energy consumption is low, technique is simple, the copper cash preparation method that manufacturing processed inclusion-free enters, the present invention is specially adapted to use high-purity electrolytic copper plate to manufacture high-purity copper cash and uses, and the copper cash of manufacture has the advantages such as purity height, high connductivity, good processability.
Description
Technical field
The present invention relates to the manufacture method of a kind of copper cash, particularly one and utilize electrolytic copper plate raw material, manufactured copper line process does not change the method for the manufacture copper cash of its purity.
Background technology
(purity of copper reaches more than 99.99% to narrow sense height fine copper, or claim 4N copper) and superelevation fine copper (5N��7N) broad sense can be called high fine copper, high-purity copper cash made based on it then has very wide application prospect as high-end electronic material in electric equipment products, such as: high definition TV signal line, high-quality speaker wire, motor in electric automobile tailor-made paint envelope curve, vacuum evaporation target material, robot transmission cable, in the embody rule such as photovoltaic copper strips, high-purity copper cash need to be used in a large number as product core material, because high-purity copper cash has the higher purity of more conventional copper, less lattice imperfection and impurity, just mean that material possesses higher electroconductibility, the snappiness of better thermal diffusivity and Geng Jia, these characteristics are the high-fidelity of product, less energy-consumption, high security provides the guarantee of essence.
The domestic and international preparation method about high-purity copper cash seldom appears in the newspapers at present, application number be 200910238906.6 Chinese invention patent disclose the preparation method of a kind of high pure metal wire rod, wherein just provide the technology of preparing scheme of high-purity copper cash, the program contain electrolytic copper plate cut and degassed pre-treatment, type roll into work in-process copper cash, work in-process copper wire annealing, annealing after many copper cash adopt cold pressure welding head and the tail to be connected to multiple operation such as thermal treatment of dish circle, drawing and necessity. Though relative traditional wire material processing method such as smelting process saves the process cost of some complexity, but still there is obvious technological deficiency in implementation process, seriously limit the implementation and operation of this technical scheme. It is mainly reflected in following three aspects:
1, the inner quality defect hidden danger existing for the electrolytic copper plate that market is supplied in a large number is failed to consider, and these inner quality defects cannot be eliminated by the degassed pre-treatment described in its scheme. There is layering more or less and/or micro-gas hole defect in the electrolytic copper material plate inside that most electrolytic copper plate manufacturer provides, only carry out degassed process and cannot make electrolytic copper plate dense structure, can be regarded as in plate these with the non-densifying material structure in inside is inherent crackle, and inherent crack defect rolls in rear ideotype, drawing, be difficult to healing in annealing process, and be very easy to that rapid expansion causes copper material to send out crisp, decortication, foaming phenomena, even directly cutting and in the course of processing, direct layering is scrapped. It is worth mentioning that, owing to electrolytic copper plate mostly does melting use for being cut into copper billet, and whether electrolytic zinc-coated steel sheet exists obvious layering and/or the compactness of melting product is not produced great negative impact by micro-pore, therefore electrolytic copper plate production factory is necessary or without the need to going increase equipment and Productive statistics to reduce layering and/or the gas hole defect of electrolytic copper plate inside mostly.
2, many work in-process copper cash adopt cold pressure weldings to carry out head and the tail to be connected, production efficiency is low and production cost height and be not suitable for producing high-purity copper cash in enormous quantities. Article two, the cold pressure welding of work in-process copper cash into a line average needed for expend time in and be about 1��2 minute, also do not comprise die change time, each weld bond reconditioning deburring time, and each work in-process copper cash is about 5��7kg, it is too low that obvious this needed to produce several tons even the COPPER WIRES PRODUCTION efficiency of more than tens tons for one day, and the die cost consumed when the copper cash of larger diameter (more than �� 6mm) carries out cold pressure welding is also quite high (just needing more mold exchange about 2000��3000 times), this also considerably increases production cost undoubtedly.
3, not considering the characteristic of high-purity material, its wire annealing thermal treatment temp is higher, energy consumption higher and be unfavorable for ensure material high purity. Copper wires annealing temperature disclosed in this invention at least all more than 300 DEG C (even if the energising direct heating wire rod adopted in the program, its high temperature section Heating temperature has substantially also reached about 550 DEG C), this in fact with annealing process not what difference of conventional fine copper, but annealing temperature high so easily causes the oxidation of copper on the one hand, namely the high purity of material is destroyed, the problem simultaneously causing annealing operation energy consumption high on the other hand.
High-purity copper cash conforming product rate that above-mentioned technological deficiency makes employing the method prepare is low, production cost height, is unfavorable for the promotion and application of high-purity copper cash.
Summary of the invention
The technical problem to be solved in the present invention is, for the above-mentioned defect of prior art, provide a kind of production efficiency height, the inner quality defect existing for electrolytic copper plate raw material manufacturing copper cash can be eliminated, ensure that copper cash quality, cost are lower, and in manufactured copper line process, impurity does not enter in copper cash finished product, keeps the copper cash manufacture method that the purity of its finished product does not reduce.
The technical solution adopted for the present invention to solve the technical problems is: comprise following concrete steps:
(1), to electrolytic copper plate raw material carrying out sorting, sub-elect without lamination defect and the copper coin raw material having lamination defect, (3) the copper coin raw material without lamination defect directly enters step, has the copper coin raw material of lamination defect to enter step (2);
(2), to the copper coin raw material having lamination defect carry out dense structure's process, eliminate copper coin raw material lamination defect;
(3), to the copper coin raw material without lamination defect, the copper bar cutting into design width is stand-by;
(4) the copper bar, to step (3) obtained carries out special-shaped rule circle processing, makes the copper bar of circular section;
(5) the circular section copper bar, to step (4) obtained, carries out surface removal zone of oxidation, deoils and after deburring process, carry out continuously extruded, make dish round copper wire;
(6) the dish round copper wire, to step (5) obtained, according to the copper wire diameter of design and the shaping deformation rate of a drawing, iterative cycles carry out that drawing is shaping and the annealing heat treatment step of drawing process, obtain the copper cash of design requirements diameter.
Described step (1) in, electrolytic copper plate raw material carries out sorting, is adopt UT (Ultrasonic Testing) mode to be sub-elected by electrolytic copper plate raw material without lamination defect and the electrolytic copper plate raw material having lamination defect.
Described step (2) in, copper coin raw material carries out dense structure's process, be adopt vacuum heating-press sintering thermal treatment;
Vacuum heating-press sintering process of thermal treatment is: copper coin raw material is placed in vacuum sintering funace, 5��60MPa pressure is applied on the two sides of copper coin raw material, and in vacuum condition or inert atmosphere, under 800��1010 DEG C of temperature condition, it is incubated 5��30 minutes, then it is cooled to less than 60 DEG C to come out of the stove, obtains and eliminate copper coin raw material lamination defect, the copper coin raw material of dense structure.
Described step (2) in, copper coin raw material carries out dense structure's process, be adopt Hot rolling process;
The technique of hot rolling process is: copper coin raw material is placed in heat treatment furnace heating or carries out the technique of the hot rolling process of transverse magnetic field induction heating;
The hot rolling treatment process adopting heat treatment furnace to heat is: copper coin is put into the heat treatment furnace under weakly reducing atmosphere or inert atmosphere, it is heated to 200��400 DEG C, it is incubated 10 minutes��1 hour, hot rolls one-pass roller is sent into immediately after being come out of the stove by copper coin, rolling deformation rate is 20%��50%, above-mentioned heating, insulation and rolling technology repeatedly, obtains and eliminates copper coin raw material lamination defect, the copper coin raw material of dense structure;
The hot rolling treatment process of employing transverse magnetic field induction heating is: utilize line-frequency induction coil by copper coin rapid heat to 200��400 DEG C, then hot rolls one-pass roller is sent into immediately, rolling deformation rate is 20%��50%, above-mentioned heating and rolling technology repeatedly, obtain and eliminate copper coin raw material lamination defect, the copper coin raw material of dense structure.
Described step (4) in, copper bar carries out special-shaped rule circle processing, and the copper bar making circular section is that employing type rolls or processing of swaging, and makes the copper bar after cutting repeatedly carry out type by the deformation rate of design and rolls or swage, and the copper bar of circular section is processed in acquisition from square-section.
Described step (5) in, circular section copper bar, carry out surface removal zone of oxidation, deoil and deburring process after, by to the uninterrupted continuously feeding in continuous extruder extrusion chamber, firm seam between the copper bar of circular section is realized integral in extrusion chamber, must at the copper cash of the obtained intended diameter of overflow mould outlet of extrusion machine.
Described step (6) in, in the annealing heat treatment step of drawing moulding process, annealing thermal treatment adopts the continuously online annealing way along with drawing moulding process, by the purity of copper cash by height on earth, selects annealing temperature to be 100 DEG C��300 DEG C.
The present invention adopts UT (Ultrasonic Testing) first electrolytic copper plate raw material to be carried out sorting, can choose rapidly those without the plate of lamination defect and have a lamination defect electrolytic copper plate raw material out. Electrolytic copper plate raw material without lamination defect then can directly carry out cutting into one fixed width; Have the electrolytic copper plate raw material of lamination defect then must carry out dense structureization process lamination defect is healed completely after just can cut. So just can guarantee to prepare lumber recovery and the quality product of the high-purity copper cash of following process, fundamentally avoid electrolytic copper plate raw material layering hidden danger.
There is the electrolytic copper plate raw material of lamination defect to be made it dense structure, according to the physicals of copper, processing characteristics and chemical property, work out suitable technique. Of the present invention have two kinds of modes:
1, vacuum heating-press sintering method. There is the temperature that the electrolytic copper plate raw material of lamination defect is suitable in vacuum thermal sintering stove with under the machinery provided or hydraulic pressure pressure condition; the copper that original lamination defect place is separated starts to contact with copper face; and make the copper atom of contact surface diffuse to form mortise through the regular hour; under certain vacuum tightness or protective atmosphere, turn avoid appearance or problem of oxidation that copper inhales hydrogen phenomenon simultaneously, while namely ensure that the purity of its electrolytic copper plate raw material, realize its dense structure's property.
2, Hot rolling. The method is according to two kinds of metallic substance (0.3��0.4T under hot-rolled temperaturem, TmFor melting temperature), the principle of the firm physical metallurgy bonding of intermetallic can be formed in single pass deformation rate more than 20%. The present invention discloses, based on above-mentioned principle, electrolytic copper plate raw material realizes the very effective scheme of dense structureization, namely originally having the electrolytic copper plate raw material of interior laminate layer defect to be considered as is two blocks of same metal plates to be composite near defect place, when suitable hot rolling processing temperature and enough rolling pass deformation rates so that layering place realizes defect healing.
What deserves to be explained is, the electrolytic copper plate raw material through dense structure's chemical industry sequence to be confirmed could continue after without lamination defect next step processing again through ultrasonic inspection.
Type rolls or swaging techniques is at present for the shaping comparatively ripe technique of non-ferrous metal wire rod roughing, especially the material good for copper this kind of working plasticity, resistance to deformation is not too high, adopt such as Y type three rolling multi-pass rolling, quality extraordinary circular section copper pole stock can be obtained.
Copper pole stock must carry out surface treatment before entering continuous extruder, this surface treatment is in order to reach copper bar surface non-oxidation, without effect oily, impulse-free robustness, the treatment process adopted is generally mechanical grinding surface bonding thermal treatment (or skimming treatment), so that it may meet continuous extruder to the requirement of blank surface quality.
The many copper bars that surface treatment is good can carry out continuously extruded operation. Continuously extruded method is the technology invented by the D. Green of the Springfields nuclear energy institute of Britain in the seventies in last century, recent two decades comes at Chinese development quickly, has obtained universal at copper material manufacture field (such as copper cash, copper row, copper plate/strip) and has promoted especially. Its principle is motivating force and the heating source that the metal making full use of in press working and tool in contact heat of friction become distortion, overcomes the process discontinuity of usual extrusion process, it may be achieved length is extruded close to the material of endless in theory. Owing to blank is required very not high by continuous extruder: blank does not need heating completely; As long as shaft-like material, scrap even particulate material can ensure feeding continuously. These features meet the requirement of High-efficient Production copper cash of the present invention just very much: 1) needs heating blank does not mean to avoid that high fine copper is oxidized and while contaminating impurity, significantly reduces again energy consumption; 2) the copper bar of many circular sections is uninterruptedly sent into by the spout of continuous extruder, rely on the high temperature and high pressure effect rubbing and constantly producing continuously between rotatable squeegee roller and copper bar, the firm seam of head and the tail being easy in extrusion chamber between effective implemention many copper bars, and finally at the dish round copper wire of the obtained certain diameter of overflow mould outlet. Namely the present invention program fully uses continuously extruded method can realize the characteristic of blank efficient seam in extrusion chamber, overcome the problem all relying on cold pressure welding to cause production efficiency low to connect copper cash in original technology completely.
It is worth mentioning that, continuously extruded obtained certain diameter copper cash is when down carrying out breaking and need wiring in drawing and annealing process because of appearance, Cold welding should be adopted constant to ensure the purity of copper material, it is apparent that the impact of the high-purity COPPER WIRES PRODUCTION efficiency of entirety is almost negligible by this workload.
Owing to high fine copper more conventional fine copper lattice imperfection and impurity are less, its working plasticity can be better, therefore the finished product copper cash being drawn to same size, can completely with reference to the multi pass drawing machined parameters of conventional fine copper and reduce the heat treated number of times of process softening annealing needed for it. Known pure metal material purity is more high, and its recrystallize (softens) annealing temperature and can significantly reduce; Relatively pit furnace (or bell furnace) annealing, the material property uniformity consistency of online annealing is better continuously. Copper wire annealing thermal treatment process scheme disclosed in this invention then fully considers above-mentioned base reason and feature, and such technical scheme not only reduces production energy consumption but also fully ensure that high-purity property of product, consistency of performance.
Below in conjunction with drawings and Examples, the invention will be further described.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of the embodiment of the present invention 1.
Fig. 2 is the process flow sheet of the embodiment of the present invention 2.
Embodiment
A manufacture method for copper cash, the method cuts into copper bar by copper coin and realizes through techniques such as shaping, drawing and thermal treatments, and the method comprises following concrete steps:
(1), to copper coin raw material carrying out sorting, sub-elect without lamination defect and the copper coin raw material having lamination defect, (3) the copper coin raw material without lamination defect directly enters step, has the copper coin raw material of lamination defect to enter step (2);
(2), to the copper coin raw material having lamination defect carry out dense structure's process, eliminate copper coin raw material lamination defect;
(3), to the copper coin raw material without lamination defect, the copper bar cutting into design width is stand-by;
(4) the copper bar, to step (3) obtained carries out special-shaped rule circle processing, makes the copper bar of circular section;
(5) the circular section copper bar, to step (4) obtained, carries out surface removal zone of oxidation, deoils and after deburring process, carry out continuously extruded, make dish round copper wire;
(6) the dish round copper wire, to step (5) obtained, according to the copper wire diameter of design and the shaping deformation rate of a drawing, iterative cycles carry out that drawing is shaping and the annealing heat treatment step of drawing process, obtain the copper cash of design requirements diameter.
In embodiment, described step (1) in, electrolytic copper plate raw material carries out sorting, is adopt UT (Ultrasonic Testing) mode to be sub-elected by electrolytic copper plate raw material without lamination defect and the electrolytic copper plate raw material having lamination defect.
Described step (2) in, copper coin raw material carries out dense structure's process, be adopt vacuum heating-press sintering thermal treatment;
In embodiment, vacuum heating-press sintering process of thermal treatment is: copper coin raw material is placed in vacuum sintering funace, 5��60MPa pressure is applied on the two sides of copper coin raw material, and in vacuum condition or inert atmosphere, under 800��1010 DEG C of temperature condition, it is incubated 5��30 minutes, then it is cooled to less than 60 DEG C and comes out of the stove, obtain and eliminate copper coin raw material lamination defect, the copper coin raw material of dense structure.
In embodiment, described step (2) in, copper coin raw material carries out dense structure's process, be adopt Hot rolling process;
The technique of hot rolling process is: copper coin raw material is placed in heat treatment furnace heating or carries out the technique of the hot rolling process of transverse magnetic field induction heating;
The hot rolling treatment process adopting heat treatment furnace to heat is: copper coin is put into the heat treatment furnace under weakly reducing atmosphere or inert atmosphere, it is heated to 200��400 DEG C, it is incubated 10 minutes��1 hour, hot rolls one-pass roller is sent into immediately after being come out of the stove by copper coin, rolling deformation rate is 20%��50%, above-mentioned heating, insulation and rolling technology repeatedly, obtains and eliminates copper coin raw material lamination defect, the copper coin raw material of dense structure;
The hot rolling treatment process of employing transverse magnetic field induction heating is: utilize line-frequency induction coil by copper coin rapid heat to 200��400 DEG C, then hot rolls one-pass roller is sent into immediately, rolling deformation rate is 20%��50%, above-mentioned heating and rolling technology repeatedly, obtain and eliminate copper coin raw material lamination defect, the copper coin raw material of dense structure.
In embodiment, described step (4) in, copper bar carries out special-shaped rule circle processing, and the copper bar making circular section is that employing type rolls or processing of swaging, make the copper bar after cutting repeatedly carry out type by the deformation rate of design roll or swage, obtain the copper bar being processed into circular section from square-section.
In embodiment, described step (5) in, circular section copper bar, carry out surface removal zone of oxidation, deoil and deburring process after, by to the uninterrupted continuously feeding in continuous extruder extrusion chamber, firm seam between the copper bar of circular section is realized integral in extrusion chamber, must at the copper cash of the obtained intended diameter of overflow mould outlet of extrusion machine.
In embodiment, described step (6) in, in the annealing heat treatment step of drawing moulding process, annealing thermal treatment adopts the continuously online annealing way along with drawing moulding process, by the purity of copper cash by height on earth, selects annealing temperature to be 100 DEG C��300 DEG C.
Below in conjunction with specific embodiment, the present invention is described again.
Embodiment 1: soft state high-purity (4N) copper cash of preparation �� 0.1mm. Starting material are 10 pieces of high-purity (4N) electrolytic copper plate, basic size: thickness 20mm �� width 1000mm �� length 1200mm.
See Fig. 1, embodiment 1 manufactures the method that high-purity electrolytic copper board raw material manufactures copper cash, and processing step: (1), to high-purity electrolytic copper plate raw material carry out sorting sub-elects without lamination defect and the high-purity electrolytic copper board raw material having lamination defect.
This embodiment adopts fully-automatic supersonic gamma defectoscope to be detected a flaw by 10 pieces of high-purity (4N) high-purity electrolytic copper board raw materials, it has been found that wherein has and only has lamination defect in three blocks of plates and without other defect, other seven blocks of plates are without any defect. (2), to the high-purity electrolytic copper board raw material having lamination defect carry out dense structure's process, to reach the process object without lamination defect.
This embodiment adopts vacuum hotpressing to burn stove has the high-purity electrolytic copper board raw material of lamination defect to carry out dense structure's process to three pieces; concrete technique is: copper coin is placed in vacuum sintering funace; 35MPa pressure is applied on copper coin two sides; lead to into N2 protective atmosphere; it is heated to 950 DEG C and it is incubated 20 minutes, be then cooled to 55 DEG C and come out of the stove. Three pieces of electrolytic zinc-coated steel sheets after vacuum heating-press sintering processes confirm without lamination defect through full-automatic gamma defectoscope again.
(3), the high-purity electrolytic copper board raw material without lamination defect is cut into the copper bar of design width.
To above-mentioned, the present embodiment has confirmed that without lamination defect 10 pieces of high-purity electrolytic copper board raw materials are cut, cut into the copper bar of some 20mm (thickness) �� 40mm (width) �� length 1200mm.
(4), to the copper bar of specified width, which width carry out special-shaped rule circle processing, make the copper bar of circular section.
Above-mentioned copper bar is carried out multistage cold mould and rolls by the present embodiment, and this type milling train comprises 2 flat vertical two roller frames, 8 Y type three-roller type frames, and its pass deformation rate 25-35%, the some copper bar diameters rolling outlet through this cold mould are �� 8mm.
, circular section copper bar carry out continuously extruded after surface treatment, make dish round copper wire.
Above-mentioned obtained �� 8mm copper bar must be carried out surface treatment by the present embodiment, and process of surface treatment is: copper bar first carries out online surface finish process, and type above of removing rolls the greasy dirt brought; Then entering logical decomposed ammonia in pit furnace to be reduced by copper bar, reduction temperature is 300 DEG C, annealing soaking time about 3 hours, and tapping temperature is 60 DEG C, now also can reach the effect simultaneously eliminating materials processing hardening. Some copper bars after surface treatment uninterruptedly enter the spout of TLJ250 type continuous extruder through straightening roll, squeegee roller speed is 6rmp, copper bar makes each copper bar form head and the tail in extrusion chamber with the heat that produces of continuous friction rotating squeegee roller firmly to weld, and line justified by the copper dish obtaining �� 2.5mm finally by overflow mould.
, dish round copper wire through multi pass drawing shaping and process annealing heat treatment step, final obtain the high-purity copper cash meeting user and requiring.
This high-purity copper cash is machined to the process of final dimension �� 0.1mm from �� 3mm drawing by the present embodiment, has altogether carried out 4 process annealing on TLZ series copper cash continuous annealing machine, and processing parameter is in table 1.
The high-purity copper cash process parameter and annealing of 4N
| Diameter (mm) | High temperature section annealing temperature (DEG C) | Annealing speed (m/min) |
| ��2.5 | 280 | 400 |
| ��0.8 | 280 | 800 |
| ��0.25 | 280 | 1200 |
| 0.1 | 280 | 1500 |
(residual resistance rate, is defined as �� finally to record the RRR of this high-purity wire of 4N level273K/��4K) reach 170, meet user completely to the requirement of copper purity, all the other performance index comprise resistivity and are about 103%IACS.
Embodiment 2: soft state superelevation pure (6N) copper cash of preparation �� 0.05mm.
Starting material are 10 blocks of high-purity (6N) electrolytic copper plate raw materials, basic size: thickness 15mm �� width 800mm �� length 1000mm.
See Fig. 2, embodiment 2 manufactures the method for high-purity copper cash, processing step:
(1), to superelevation pure (6N) electrolytic copper plate raw material carry out sorting, sub-elect without lamination defect and have the pure electrolytic copper plate raw material of the superelevation of lamination defect.
This embodiment adopts fully-automatic supersonic gamma defectoscope to 10 pieces of superelevation pure electrolytic copper plate high-purity flaw detections of raw material, it has been found that wherein has and only has lamination defect in two boards and without other defect, other eight blocks of plates are without any defect.
(2), to there being the pure electrolytic copper plate raw material of the superelevation of lamination defect to carry out dense structure's process, to reach the effect without lamination defect.
This embodiment adopts vacuum hotpressing to burn stove has the pure electrolytic copper plate raw material of the superelevation of lamination defect to carry out hot rolling microstructure densification to two pieces, concrete technique is: enter hot rolls one-pass roller distortion after pure for superelevation electrolytic copper plate raw material is carried out line-frequency induction heating immediately, wherein induction heating temperature is about 350 DEG C, rolling deformation rate is 35%, and the copper coin raw thickness after namely rolling is about 9.75mm. And again confirm that this two boards is without lamination defect after hot rolling through ultrasonic reflectoscope.
(3), to the copper bar that pure for superelevation electrolytic copper plate raw material is cut into design width without lamination defect.
Aforementioned eight blocks of pure electrolytic copper plate raw materials of the superelevation without lamination defect through first time sorting are cut by the present embodiment, cut into the copper bar of some 15mm (thickness) �� 35mm (width) �� length 1000mm; And just cut into the copper bar of 9.75mm (thickness) �� 20mm (width) �� length 1538mm below without the pure electrolytic copper plate raw material of two pieces of superelevation of lamination defect through hot rolling. Noting, the specification cutting copper bar has been divided into two kinds.
(4), to the copper bar of specified width, which width carry out special-shaped rule circle processing, make the copper bar of circular section.
The copper bar of above-mentioned two kinds of different sizes is carried out the special-shaped rule circle processing of two kinds of different modes by the present embodiment respectively: the first thicker wider shorter copper bar similar embodiment 1 carries out obtaining after cold mould is rolled the copper bar that some diameters are �� 8mm; It is �� 6mm copper bar that 2nd kind of thicker wider shorter copper bar then obtains some diameters through cold processing of swaging.
, circular section copper bar carry out continuously extruded after surface treatment, make dish round copper wire.
Above-mentioned obtained �� 8mm and �� 6mm copper bar must be carried out surface treatment by the present embodiment, and process of surface treatment is: copper bar first carries out online surface finish process, the greasy dirt that type above of removing rolls and rotary swaging process brings; Then copper bar enters logical nitrogen in wire-mesh belt furnace copper bar is carried out anneal, and annealing temperature is 300 DEG C, and tape running speed reaches 20m/min. Some copper bars after surface treatment uninterruptedly enter the spout of TLJ250 type continuous extruder through straightening roll, squeegee roller speed is 7rmp, copper bar makes each copper bar form head and the tail in extrusion chamber with the heat that produces of continuous friction rotating squeegee roller firmly to weld, and line justified by the copper dish obtaining �� 1mm finally by overflow mould.
, dish round copper wire through multi pass drawing shaping and process annealing heat treatment step, final obtain the high-purity copper cash meeting user and requiring.
This high-purity copper cash is machined to the process of final dimension �� 0.05mm from �� 1mm drawing by the present embodiment, has altogether carried out 3 process annealing on TLZ series copper cash continuous annealing machine, and processing parameter is in table 1.
6N superelevation fine copper line process parameter and annealing
| Diameter (mm) | High temperature section annealing temperature (DEG C) | Annealing speed (m/min) |
| ��1 | 200 | 600 |
| ��0.2 | 200 | 1200 |
| ��0.05 | 200 | 2000 |
(residual resistance rate, is defined as �� finally to record the RRR of this high-purity wire of 6N level273K/��4K) reach 8000, finished product hardness HV0.1=30��35, resistivity is about 104%IACS, and namely purity, electroconductibility, hardness (snappiness) meet the high request that high-quality copper bonding line is substituted gold wire bonding line by user completely.
Claims (3)
1. a manufacture method for copper cash, the method cuts into copper bar by copper coin and realizes through shaping, drawing and thermal treatment process, it is characterised in that, the method comprises following concrete steps:
(1), copper coin raw material is carried out sorting, sorting adopts UT (Ultrasonic Testing) mode to be sub-elected by electrolytic copper plate raw material without lamination defect and the copper coin raw material having lamination defect, (3) copper coin raw material without lamination defect directly enters step, has the copper coin raw material of lamination defect to enter step (2);
(2), to the copper coin raw material having lamination defect carrying out dense structure's process, densification is: vacuum heating-press sintering thermal treatment or Hot rolling process, eliminates copper coin raw material lamination defect;
(3), to the copper coin raw material without lamination defect, the copper bar cutting into design width is stand-by;
(4) the copper bar, to step (3) obtained carries out special-shaped rule circle processing, makes the copper bar after cutting repeatedly carry out type by the deformation rate of design and rolls or swage, obtains the copper bar being processed into circular section from square-section;
(5) the circular section copper bar, (4) step obtained, carry out surface removal zone of oxidation, deoil and deburring process after, carry out continuously extruded, by to the uninterrupted continuously feeding in continuous extruder extrusion chamber, firm seam between the copper bar of circular section is realized integral in extrusion chamber, at the copper cash of the obtained intended diameter of overflow mould outlet of extrusion machine, dish round copper wire must be made;
(6) the dish round copper wire, (5) step obtained, the deformation rate shaping according to the copper wire diameter designed and a drawing, iterative cycles carry out that drawing is shaping and the annealing heat treatment step of drawing process, annealing thermal treatment adopts the online continuously annealing way along with drawing moulding process, by the purity of copper cash by high to Low, annealing temperature is selected to be 100 DEG C��300 DEG C;
Obtain the copper cash of design requirements diameter.
2. according to the manufacture method of a kind of copper cash described in claim 1, it is characterized in that: described step (2) in, dense structure's treatment process of the vacuum heating-press sintering that described copper coin raw material carries out is: copper coin raw material is placed in vacuum sintering funace, 5��60MPa pressure is applied on the two sides of copper coin raw material, and in vacuum condition or inert atmosphere, under 800��1010 DEG C of temperature condition, it is incubated 5 ~ 30 minutes, then it is cooled to less than 60 DEG C to come out of the stove, obtain and eliminate copper coin raw material lamination defect, the copper coin raw material of dense structure.
3. according to the manufacture method of a kind of copper cash described in claim 1, it is characterised in that: described step (2) in, described copper coin raw material carry out dense structure Hot rolling process;
The technique of hot rolling process is: copper coin raw material is placed in heat treatment furnace heating or carries out the technique of the hot rolling process of transverse magnetic field induction heating;
The hot rolling treatment process adopting heat treatment furnace to heat is: copper coin is put into the heat treatment furnace under weakly reducing atmosphere or inert atmosphere, it is heated to 200��400 DEG C, it is incubated 10 minutes��1 hour, hot rolls one-pass roller is sent into immediately after being come out of the stove by copper coin, rolling deformation rate is 20%��50%, above-mentioned heating, insulation and rolling technology repeatedly, obtains and eliminates copper coin raw material lamination defect, the copper coin raw material of dense structure;
The hot rolling treatment process of employing transverse magnetic field induction heating is: utilize line-frequency induction coil by copper coin rapid heat to 200��400 DEG C, then hot rolls one-pass roller is sent into immediately, rolling deformation rate is 20%��50%, above-mentioned heating and rolling technology repeatedly, obtain and eliminate copper coin raw material lamination defect, the copper coin raw material of dense structure.
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| CN109930016A (en) * | 2017-12-18 | 2019-06-25 | 北京有色金属研究总院 | A kind of preparation method of high-strength highly-conductive Kufil glass-coated microwire |
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| CN110576073A (en) * | 2018-06-09 | 2019-12-17 | 南京理工大学 | Preparation method of ultra-long copper and copper alloy wire |
| CN110125413A (en) * | 2019-05-10 | 2019-08-16 | 四川铭泰顺硬质合金有限公司 | A kind of production technology of hard alloy bar |
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| CN113096884A (en) * | 2021-04-01 | 2021-07-09 | 江西中晟金属有限公司 | Preparation method of high-purity copper bar |
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