CN117483432A - Method for preparing copper-steel composite board by using electromagnetic induction heating for annealing and cold rolling process - Google Patents
Method for preparing copper-steel composite board by using electromagnetic induction heating for annealing and cold rolling process Download PDFInfo
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 124
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 92
- 239000010959 steel Substances 0.000 title claims abstract description 92
- 239000002131 composite material Substances 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 41
- 230000005674 electromagnetic induction Effects 0.000 title claims abstract description 36
- 238000005097 cold rolling Methods 0.000 title claims abstract description 24
- 230000008569 process Effects 0.000 title claims description 14
- 238000000137 annealing Methods 0.000 title description 14
- 229910052802 copper Inorganic materials 0.000 claims abstract description 76
- 239000010949 copper Substances 0.000 claims abstract description 76
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 73
- 230000006698 induction Effects 0.000 claims abstract description 59
- 238000005096 rolling process Methods 0.000 claims abstract description 31
- 238000005496 tempering Methods 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims description 17
- 239000007789 gas Substances 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 13
- 239000002994 raw material Substances 0.000 claims description 12
- 229910001369 Brass Inorganic materials 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000010951 brass Substances 0.000 claims description 6
- 238000010924 continuous production Methods 0.000 claims description 6
- 239000000741 silica gel Substances 0.000 claims description 6
- 229910002027 silica gel Inorganic materials 0.000 claims description 6
- 238000012856 packing Methods 0.000 claims description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 230000002441 reversible effect Effects 0.000 claims description 4
- 238000000576 coating method Methods 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 230000009467 reduction Effects 0.000 claims description 2
- 239000002023 wood Substances 0.000 claims description 2
- 239000000112 cooling gas Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 4
- 239000003302 ferromagnetic material Substances 0.000 abstract description 3
- 238000005482 strain hardening Methods 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 23
- 239000000463 material Substances 0.000 description 8
- 230000005291 magnetic effect Effects 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000005253 cladding Methods 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 238000013329 compounding Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229910000510 noble metal Inorganic materials 0.000 description 2
- RIRXDDRGHVUXNJ-UHFFFAOYSA-N [Cu].[P] Chemical compound [Cu].[P] RIRXDDRGHVUXNJ-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- DMFGNRRURHSENX-UHFFFAOYSA-N beryllium copper Chemical compound [Be].[Cu] DMFGNRRURHSENX-UHFFFAOYSA-N 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 239000002905 metal composite material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
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- 238000001953 recrystallisation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/28—Control of flatness or profile during rolling of strip, sheets or plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
- B21B37/74—Temperature control, e.g. by cooling or heating the rolls or the product
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B47/00—Auxiliary arrangements, devices or methods in connection with rolling of multi-layer sheets of metal
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
- B21B2001/386—Plates
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Metal Rolling (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The invention discloses a method for preparing a copper-steel composite board by utilizing an electromagnetic induction heating rolling process, which comprises the following steps: s1, cold rolling a copper steel copper three-layer plate; and S2, carrying out induction heating on the copper-steel composite board after cold rolling: the temperature of the steel plate can be rapidly increased by utilizing the heat effect generated by the eddy current heating by utilizing the ferromagnetic material, so that the temperature of the steel plate reaches 750-1000 ℃ and the temperature of the copper plate reaches 550-680 ℃; s3 tempering: tempering the heated plate blank by using induction heating; s4, leveling and straightening. The method for producing the copper steel composite board greatly reduces the work hardening of the copper steel composite board and improves the subsequent processing performance. The obtained copper steel composite board has good mechanical property and high bonding strength.
Description
Technical Field
The invention belongs to the technical field of preparation of metal layered composite boards, and particularly relates to a method for preparing a high-performance copper steel composite board by combining an electromagnetic induction technology with a cold rolling process.
Background
The layered metal composite board can realize the combination of the advantageous properties of different metal materials, such as wear resistance, corrosion resistance, heat conductivity, magnetic permeability, electromagnetic shielding and other different materials, and forms a novel multifunctional composite material. The cold rolling composite process can partially replace a coating process to produce the cladding plate, the production mode is environment-friendly and pollution-free, the density and thickness of cladding metal can be improved, and the quality of the cladding is improved.
The common metal is used for replacing rare noble metals, so that the rare noble metals are saved on the premise of meeting or improving the surface property, the comprehensive mechanical property and the welding forming property, and the material cost can be greatly reduced. For example, steel/stainless steel is used as a substrate, and copper is compounded on one side or two sides. The composite board has the conductivity of copper and the strength and elasticity of steel, can replace brass, phosphor copper, beryllium copper and the like for punching and connecting pieces for conduction, and effectively avoids aging crack defects of brass.
The cold rolling composite process is complex and has great technical difficulty. However, compared with the composite technologies such as explosion composite, hot rolling cold rolling composite, mechanical composite and the like, the cold rolling composite has obvious advantages in the aspects of production efficiency, variety and specification adaptability, surface quality, environmental protection, energy conservation, technical economy and the like, and has the following advantages: one-step composite molding can be realized, continuous production can be realized, and the production efficiency is high; can adapt to the compounding among various metals; the process yield is high, and the composite economy is good; the production process is energy-saving and environment-friendly; the product has good plate shape and good surface quality.
In order to enable the copper-steel composite board to have good bending resistance and high bonding performance, reduce the work hardening of the copper-steel composite board, improve the subsequent processing performance of the composite board, and research on a better method for preparing the copper-steel composite board by combining a cold rolling process is needed.
Disclosure of Invention
The invention provides a method for preparing a copper-steel composite board by electromagnetic induction heating under a protective atmosphere, which mainly utilizes the principle that the temperature of a ferromagnetic material can be rapidly increased in a short time by utilizing the heat effect generated by eddy current heating, and obtains the method for preparing the copper-steel composite board by annealing and cold rolling processes by utilizing electromagnetic induction heating.
The electromagnetic induction heating device used by the method is a KPS-160/2.5 thyristor intermediate frequency induction heating furnace, and an annular copper coil customized and developed for a plate-shaped sample is adopted. During induction heating, the coil is spaced from the surface of the composite plate by a distance exceeding 15mm due to the skin effect. The whole process from induction heating to rolling realizes H 2 +N 2 1, the method comprises the following steps: 3 volume ratio, and can prevent oxidation of the surface of the plate in the heating process while cooling copper.
The method of the invention comprises the following steps:
the invention provides an induction heating cold rolling system, which comprises a conveying system and an induction heating system matched with the conveying system and controlled by a computer control system, wherein the induction heating system consists of an induction heater and an induction heating power supply, and is characterized in that the induction heater is an electromagnetic induction heating device, a copper ring-shaped induction heating coil is arranged in the induction heater, and a copper steel composite plate to be heated can pass through the middle of the induction heating device;
parameters of an induction heating coil in the electromagnetic induction heating device 3 are adjusted by a computer control system;
the electromagnetic induction heating device is provided with a useful thermal infrared imager so as to measure the temperature of the interface of the side surface of the copper-steel-copper bonding layer;
the device also comprises an air inlet channel 7 for conveying the cooling air into the sealed electromagnetic induction heating device 3, wherein an air nozzle faces the upper surface and the lower surface of the conveyed copper-steel composite board 5, and the cooling air is discharged through an air outlet channel 8;
the electromagnetic induction heating device adopts a sealing measure. For the production process of a single plate, a heating cover is adopted for sealing, and the packing is sealed by the heating cover specifically through an inner cover sealing silica gel strip. For a continuous production flow, gas sealing is used: the induction heating device 3 has micro positive pressure, and oxygen cannot enter the heating furnace.
Preferably, the electromagnetic induction heating means is an intermediate frequency induction heating furnace such as a KPS-160/2.5 thyristor intermediate frequency induction heating furnace.
It is also preferable that the thermal infrared imager 6 is designed on the front and rear three sides of the electromagnetic induction heating device 3; the computing control system is a PLC system; the transport system comprises a guide rail 2.
Specifically, the shielding gas is 1:3 volume ratio of mixed H 2 +N 2 And (3) gas.
The invention particularly provides a method for preparing a copper-steel composite board by combining the induction heating cold rolling system with a cold rolling process, which comprises the following steps of:
s1, cold rolling a copper steel copper three-layer plate: selecting a roll of steel strip and two rolls of copper strip with the same width, coating copper on the outer side of the steel, and pushing the steel strip and the two rolls of copper strip into a rolling mill for rough rolling after selecting preset rolling speed and rolling reduction to obtain a copper-steel composite board;
s2, induction heating the copper steel composite board: conveying the copper-steel composite board to an electromagnetic induction heating device through a conveying system of the induction heating cold rolling system for heating treatment, and adopting mixed gas to blow copper surfaces for cooling;
s3, tempering: vacuumizing, and slowly cooling to 10-30 ℃ by using a protective gas at a tempering temperature of 120-350 ℃ for one hour;
s4, leveling and straightening: and after the tempered copper steel composite board is cooled, carrying out cold straightening and leveling treatment on the copper steel composite board.
Specifically: the middle layer raw material used in the step S1 is IF interstitial free steel, and the thickness and width of the steel plate are 6.0 multiplied by 510mm; the upper layer raw material and the lower layer raw material are both H65 brass, and the thickness and width of the copper plate are 0.28 multiplied by 540mm.
Preferably, in the step S2, the induction heating current ranges from 50A to 1500A, the heating time ranges from 10S to 60S, the steel plate is heated to 750 ℃ to 1000 ℃ and then air-cooled, and the copper plate is heated to 550 ℃ to 680 ℃ and then air-cooled.
In a specific embodiment, the rolling force in the step S1 is 1055t, the rolling force is 2.2X1510 mm, the rolling force is 0.4mm after 4 times of rolling, and the rolling force is 5-6 times of reversible rolling to the target thickness of 0.13+/-0.005 mm.
In a further embodiment, in step S1 the whole coil is wound on an unwind reel of a cold rolling mill, supported by a block of wood, rewound onto a coiler steel sleeve with a pressureless medium tension flat pass-through plate, due to the diameter of the coil being different from the inner diameter of the coil.
Preferably, the copper steel composite board is leveled to 0.13mm in the step S4.
The invention has the advantages that the temperature of the ferromagnetic material can be quickly increased in a short time by the thermal effect generated by the eddy current heating of the annular coil, a temperature field required by the copper-steel coordination deformation compounding is constructed, the work hardening phenomenon of the composite board is greatly reduced, and the forming performance of the composite board is improved, so that the copper-steel composite board with coordination deformation and high bonding strength is prepared.
Copper conducts heat very quickly due to the different annealing temperatures required for copper and steel. If the existing heating method is adopted, copper is brought into a molten state to refine grains of steel for annealing, so that default materials are caused, and the heat treatment furnace box is polluted. This situation is particularly severe for thin sheet materials, where the invention appears to be more advantageous.
And because the resistivity, specific heat capacity and other material properties of copper and steel have larger differences, if the copper and the steel are simultaneously subjected to electromagnetic induction heating, a temperature difference can be generated. By utilizing the characteristic that the resistance of copper is far smaller than that of steel, under the condition of the same current, the heat quantity in the steel can reach hundreds of times of the heat quantity in the copper. I.e. the high melting point steel layer is heated separately to a high temperature, and the low melting point copper layer is brought to a lower temperature, whereby both materials are annealed at a suitable temperature.
According to the invention, the composite board is integrally heated (wherein copper and steel are heated, but the temperatures are different, namely, the copper and the steel are annealed at proper temperatures respectively), the grain size is obviously refined, and the dynamic recrystallization of the grains is promoted. The generated large amount of crystal nucleus can generate recrystallized grains at the crystal boundary, so that the grains are further refined. The thinned crystal grains lead the mechanical property of the material matrix to be improved to a certain extent, and the shearing fracture is carried out at the position where the matrix occurs partially, so the bonding strength is correspondingly improved.
In addition, the tempering step in the method is carried out in the same induction heating furnace used for annealing, so that on-line tempering is realized, and the complexity of the working procedure is reduced. In conclusion, the copper-steel composite board with coordinated deformation and high bonding strength can be prepared by the method.
Drawings
FIG. 1 is a schematic diagram of electromagnetic induction heating;
FIG. 2 is a flow chart of cooling air flow in an electromagnetic induction heating apparatus (single sheet production process);
FIG. 3 shows a flow chart of the air flow in the electromagnetic induction heating apparatus (continuous production process);
wherein, the reference numerals are as follows: the device comprises a roller 1, a guide rail 2, an induction heating device control system 3, an induction heating coil 4, a copper steel composite plate to be heated 5, an infrared temperature measuring device 6, an air inlet channel 7, an air outlet channel 8, a sealing plug silica gel strip 9 and a heating device sealing cover 10.
Detailed Description
The invention will now be illustrated by means of specific examples in order to provide a better understanding of the invention, without however being limiting thereto.
Embodiment one: electromagnetic induction heating device
In a common induction heating cold rolling process, the cold rolling device comprises a conveying system and an induction heating system matched with the conveying system and controlled by a PLC control system, wherein the induction heating system consists of an induction heater and an induction heating power supply, the key component is the induction heater, and a method for generating heat in a material through an alternating magnetic field is generally adopted.
FIG. 1 shows a schematic diagram of the invention employing electromagnetic induction heating. Wherein the heater adopts an electromagnetic induction heating device 3, and particularly adopts a KPS-160/2.5 thyristor intermediate frequency induction heating furnace. Inside the furnace, an induction heating coil 4 made of copper is included, and a copper-steel composite plate 5 to be heated can pass through the middle. The size and shape of the induction heating coil 4 should ensure that the magnetic field acts mainly on the steel layer while minimizing the influence on the copper layer, in particular, a ring-shaped copper coil is used as the induction heating coil 4 for the plate-shaped specimen. The principle is that the coil is made of copper, and the influence of the magnetic field on the copper layer is small due to the shielding effect of the copper on the magnetic field.
The electromagnetic induction heating device 3 is provided with a useful thermal infrared imager 6 which is designed on three sides of the front and rear sides of the electromagnetic induction heating device 3 to measure the temperature of the interface of the side surface of the copper-steel-copper bonding layer (see fig. 2 for details). The thermal infrared imager 6 can be used to record slab temperature profiles at different times. Meanwhile, parameters of the heating coil 4 in the electromagnetic induction heating device 3 are adjusted through a computer such as a PLC system, so that accurate control of heat in the steel layer is realized, and the aim of heating only steel but not copper is fulfilled, and the principle is that: the heating depth is inversely related to the 0.5 th power of the frequency, so that with medium frequency induction heating, the frequency can be lowered to some extent to increase the heating depth, i.e. the steel is intensively heated to the intermediate layer.
1, the method comprises the following steps: 3 volume ratio of mixed H 2 +N 2 The gas is introduced into the spray through the air inlet channel 7 to sweep the upper and lower surfaces of the plate, so as to cool down the copper on the surface layer. The sealing system is an inner cover sealing silica gel strip, and the heating cover seals packing, specifically, after the guide rail 2 sends the composite board 5 into the heating furnace 3, the heating cover 10 is put down, and the edge of the heating cover seals packing. In addition, the contact parts of the air inlet channel 7 and the air outlet channel 8 and the inner cover are sealed by sealing silica gel strips 9 (suitable for the production process of a single plate). The air inlet channel 7 conveys the air into a sealed electromagnetic induction heating device, and the cold mixed gas blows the copper surface to cool down while playing a role in protecting atmosphere. The mixed gas flows out from the side exhaust passage 8.
In operation, the copper-steel composite plate cold-rolled by the roller 1 is transferred into the induction heating device 3 through the guide rail 2. After the induction heating coil 4 is electrified, an alternating magnetic field is generated inside the coil, so that the magnetic moment in the steel layer is changed, and heat is generated to heat the copper-steel composite board 5 positioned in the coil.
For a continuous production flow, gas sealing is used: the induction heating device 3 has micro positive pressure, and oxygen cannot enter the heating furnace. As shown in fig. 3, wherein the airflow pattern within the electromagnetic induction heating apparatus is significant, and there is no 8 vent passage and 10 heating apparatus seal cap.
Embodiment two: method for preparing single-sheet copper-steel composite board
The method for preparing the copper-steel composite board (single board production) by adopting the electromagnetic induction heating device described in the first embodiment to carry out annealing and cold rolling process comprises the following steps:
1) Cold rolling the copper steel copper three-layer plate: one roll of steel strip and two rolls of copper strip with the same width are selected, IF gapless atomic steel (thickness and width are 6.0 multiplied by 510 mm) is selected as a middle layer raw material, H65 brass (thickness and width are 0.28 multiplied by 540 mm) is selected as an upper layer raw material and a lower layer raw material, rolling force is 1055t, and rolling is carried out until the thickness and the width are 2.2 multiplied by 510mm. 4 times of rolling to 0.4mm, and 5-6 times of reversible rolling to the target thickness of 0.13+/-0.005 mm to obtain the copper-steel composite board.
2) Induction heating copper steel composite board: the copper steel composite plate is conveyed to a heating link provided with the electromagnetic induction device described in the first embodiment through a conveying system. The induction heating current ranges from 50A to 1500A, and the heating time is 10s-60s; the steel plate is heated to 750 to 1000 ℃ and then air-cooled, and the copper plate is heated to 550 to 680 ℃ and then air-cooled. With H introduced from line 7 2 And N 2 The mixed gas of the gases blows the copper surface to cool.
3) Tempering: vacuumizing and filling N 2 The tempering temperature is 120 ℃ to 350 ℃. Keep the temperature for one hour and slowly cool to room temperature.
4) Leveling and straightening: and after the tempered copper steel composite board is cooled, carrying out cold straightening treatment on the copper steel composite board, and leveling to 0.13mm.
In a specific example, the following parameters are adopted:
1) The intermediate layer raw material is IF interstitial free steel (length, thickness and width are 1000×6.0X1510 mm), the upper layer raw material and the lower layer raw material are H65 brass (length, thickness and width are 1000×0.28X1540 mm), the rolling force is 1055t, and the rolling force is 1000×2.2X1510 mm. 4 times of rolling to 0.4mm, and 5-6 times of reversible rolling to the target thickness of 0.13mm.
2) The induction heating current was selected to be 1250A and the heating time was 38s such that the steel sheet temperature was higher than the copper plate temperature difference Δt=230℃.
3) Tempering the composite board at 250 ℃, preserving heat for one hour, and slowly cooling to room temperature. And carrying out cold straightening treatment on the warped copper steel composite board by using a roller type board straightening machine.
4) The copper steel composite board obtained by the embodiment is harmonious in deformation, and each layer of the obtained board is relatively uniform in structure. The composite interface shear strength was tested according to YS/T550-2006, and the results are shown in Table 1, and the average shear strength of the copper steel composite interface was measured to be 109MPa. In the prior art, a hood-type annealing furnace is adopted for annealing: heating to 680 deg.c for 7 hr, maintaining for 1 hr, cooling to 500 deg.c, opening the heating cover, cooling to below 300 deg.c, and discharging from the furnace at 20 deg.c. The hood-type annealing furnace method adopts a single temperature of 680 ℃ for the whole composite board, and the annealing temperature required by the steel layer can not be reached. The average shear strength was less than 100MPa, and the results are shown in Table 2.
TABLE 1 average shear Strength at the interface of copper Steel composite plates obtained in this example
Table 2 average shear strength at copper steel composite plate interface obtained by hood-type annealing furnace
Embodiment III: method for continuously producing copper-steel composite board
For the continuous production flow, the composite strip after rolling and compositing directly enters an annealing furnace for heat treatment, and finished product rolls are directly exported after steps of annealing, tempering, cooling and the like in an induction heating device. Unlike the second embodiment, which uses a sealing cover to seal the individual plates, the present embodiment uses gas sealing: the induction heating furnace 3 has slight positive pressure, and oxygen cannot enter the furnace. As shown in fig. 3, there is no 8 vent passage and 10 heating device seal cap, as compared to the embodiment.
Finally, it should be noted that: the embodiments described above are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced with equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (10)
1. The induction heating system comprises a conveying system and an induction heating system which is matched with the conveying system and is controlled by a computer control system, wherein the induction heating system consists of an induction heater and an induction heating power supply;
parameters of the induction heating coil 4 in the electromagnetic induction heating device 3 are adjusted by a computer control system;
the electromagnetic induction heating device is provided with a thermal infrared imager 6 for measuring the temperature of the interface of the side surface of the copper-steel-copper bonding layer;
the device also comprises an air inlet channel 7 for cooling air, wherein the air can be conveyed into a sealed electromagnetic induction heating device, an air nozzle faces the upper surface and the lower surface of the conveyed copper-steel composite board 5, and the air is discharged by an air outlet channel 8;
the electromagnetic induction heating device adopts a sealing measure, wherein for the production process of a single plate, a heating cover is adopted for sealing, specifically, a sealing silica gel strip is sealed through an inner cover, a packing is sealed through the heating cover, after the composite board 5 is sent into the heating furnace 3 by the guide rail 2, the heating cover 10 is put down, and the packing is sealed at the edge of the heating cover. In addition, the contact parts of the air inlet channel 7 and the air outlet channel 8 and the inner cover are sealed by sealing silica gel strips 9; for a continuous production flow, gas sealing is used: the induction heating device 3 has micro positive pressure, and oxygen cannot enter the heating furnace.
2. An induction heating system according to claim 1, characterized in that the electromagnetic induction heating means is an intermediate frequency induction heating furnace, such as a KPS-160/2.5 thyristor intermediate frequency induction heating furnace.
3. The induction heating system according to claim 1, wherein the thermal infrared imager 6 is provided on three sides of the electromagnetic induction heating apparatus; the computing control system is a PLC system; the transport system comprises a guide rail 2.
4. The induction heating system of claim 1, wherein said cooling gas is 1:3 volume ratio of mixed H 2 +N 2 And (3) gas.
5. A method for producing a copper steel composite panel by using an induction heating system according to any one of claims 1 to 4 in combination with a cold rolling process, characterized in that: the method comprises the following steps:
s1, cold rolling a copper steel copper three-layer plate: selecting a roll of steel strip and two rolls of copper strip with the same width, coating copper on the outer side of the steel, and pushing the steel strip and the two rolls of copper strip into a rolling mill for rough rolling after selecting preset rolling speed and rolling reduction to obtain a copper-steel composite board;
s2, induction heating the copper steel composite board: conveying the copper-steel composite board to an electromagnetic induction heating device through the conveying system for heating treatment, and adopting mixed gas to blow the copper surface for cooling;
s3, tempering: vacuumizing, introducing protective gas, tempering at 120-350 ℃, preserving heat for one hour, and slowly cooling to 10-30 ℃;
s4, leveling and straightening: and after the tempered copper steel composite board is cooled, carrying out cold straightening and leveling treatment on the copper steel composite board.
6. The method according to claim 5, wherein: the middle layer raw material used in the step S1 is IF interstitial free steel, and the thickness and width of the steel plate are 6.0 multiplied by 510mm; the upper layer raw material and the lower layer raw material are both H65 brass, and the thickness and width of the copper plate are 0.28 multiplied by 540mm.
7. The method according to claim 5, wherein: in the step S2, the induction heating current ranges from 50A to 1500A, the heating time ranges from 10S to 60S, the steel plate is heated to 750 ℃ to 1000 ℃ and then air-cooled, and the copper plate is heated to 550 ℃ to 680 ℃ and then air-cooled.
8. The method according to claim 5, wherein: the rolling force in the step S1 is 1055t, the rolling force is 2.2X1510 mm, the rolling force is 0.4mm after 4 times rolling, and the rolling force is 5-6 times reversible rolling to the target thickness of 0.13+/-0.005 mm.
9. The method according to claim 5, wherein: in the step S1, the whole coil is wound on an uncoiling drum of a cold rolling mill, and the coil is rewound on a steel sleeve of a coiling machine by adopting a wood block for supporting and adopting a pressureless medium-tension flat through plate due to the fact that the diameter of the coil is different from the inner diameter of the coil.
10. The method according to claim 5, wherein: and in the step S4, flattening the copper steel composite board to 0.13mm.
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