CN110385351B - Production method of special-shaped copper strip - Google Patents
Production method of special-shaped copper strip Download PDFInfo
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- CN110385351B CN110385351B CN201910643089.6A CN201910643089A CN110385351B CN 110385351 B CN110385351 B CN 110385351B CN 201910643089 A CN201910643089 A CN 201910643089A CN 110385351 B CN110385351 B CN 110385351B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/14—Plants for continuous casting
- B22D11/145—Plants for continuous casting for upward casting
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- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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Abstract
The invention relates to a production method of a special-shaped copper strip, which comprises the following steps: upward continuous casting, continuous extrusion, one-time rolling, one-time drawing and annealing; the grain size of the special-shaped copper strip prepared by the method is 0.007-0.015mm, the electric conductivity is more than 101% IACS, the repeated bending times of the hydrogen embrittlement test are not less than 15, the tensile strength is more than 220MPa, and the elongation is more than 55%.
Description
Technical Field
The invention relates to a method for processing non-ferrous metal, in particular to a method for producing a special-shaped copper strip.
Background
The special-shaped copper strip is mainly used for manufacturing high-precision lead frames, new energy automobiles and other industries, and mainly requires the following according to the use characteristics: has high electric and thermal conductivity, and simultaneously has good strength, hardness, softening resistance, electroplating performance, brazing performance and plastic package performance.
The conventional production process of the special-shaped copper strip mainly comprises a rolling method, a milling method, a forging and pressing method and the like.
The rolling method comprises the following steps: taking Japan company as a representative, the method mainly comprises the steps of rolling a corresponding special-shaped copper strip blank by using a roller and then rolling a finished product by using the roller. The disadvantages are as follows: the performance and the surface quality of the cast strip blank cannot meet the requirements of subsequent processing. The product has low dimensional precision, is easy to generate larger internal stress, and is difficult to control the plate shape.
Milling: typically, German corporation, a copper strip blank is first milled to obtain a shaped copper strip blank, and then the shaped copper strip blank is rolled by a shaped roll to obtain a finished product. The disadvantages are as follows: the utilization rate of the strip is low, the yield is low, the density is low, the mechanical property is poor, and the surface quality is poor.
Forging and pressing: and as represented by French company, forging the deformed copper strip blank by a high-speed forging press, and then rolling the blank by a forming roller to obtain the product. The advantages are that: less metal loss, high precision and small internal stress of products. The disadvantages are as follows: long process flow and low production efficiency.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a short-process production method of a special-shaped copper strip with excellent performance.
The technical scheme of the invention is as follows:
a production method of a special-shaped copper strip comprises the following specific steps:
(1) up-drawing continuous casting
A power frequency smelting device is adopted for up-drawing continuous casting of the copper rod, and the smelting device comprises a smelting furnace, a holding furnace, a traction device and a coiling device.
The traction device comprises a crystallizer, a graphite mold, a sheath and a traction motor.
The graphite mould is arranged at the bottom of the crystallizer, and the joint of the graphite mould and the bottom of the crystallizer is plugged by asbestos threads and coated with graphite latex to prevent air intake and copper infiltration.
The depth of the graphite mould inserted into the copper liquid is 30-50mm, and the temperature difference between the cooling water inlet and the cooling water outlet of the crystallizer is 15 ℃. The temperature of the smelting furnace is 1205 ℃, the temperature of the holding furnace is 1155 ℃, the voltage of the smelting furnace is 380-420V, and the voltage of the holding furnace is 300-340V.
The diameter of the upward continuous casting copper rod is phi 20mm, the pitch is 3-5 mm, and the upward continuous casting speed of the copper rod is 600-700 mm/min; the liquid level height of the copper liquid is 400-450 mm; the melting furnace is covered by charcoal with the thickness of 100-150 mm, and the heat preservation furnace is covered by graphite phosphorus sheets with the thickness of 30-40 mm, and is level to the upper surface of the sheath.
(2) Continuous extrusion
And continuously extruding the upward continuous casting copper rod to prepare the special-shaped copper strip blank.
Preheating a continuous extrusion tooling die at 460 ℃, and keeping the temperature for 5 hours; placing the preheated tooling die into the shoe base, placing the preheated tooling die into a guide plate, covering a pressing plate, screwing down screws, closing the shoe base, pressing a pressing cylinder, and sleeving an anti-oxidation pipe; the pressure gauge of the compaction cylinder is 22-25 Mpa, the rotating speed of the main shaft is 3.5 turns, and hot materials are added. The hot material is 10 oxygen-free copper rods with the diameter of phi 30mm, the length of 400 mm and the temperature of 700-800 ℃.
The clearance between the continuous extrusion tooling die and the extrusion wheel is 0.7 mm.
The cross sections of the special-shaped copper belt blank prepared by continuous extrusion and the finished special-shaped copper belt are in the same proportion.
(3) One pass rolling
And (3) rolling the continuously extruded special-shaped copper strip blank once.
The processing rate of one-pass rolling is 20-50%.
Two-roller rolling mill is adopted during one-pass rolling, wherein the lower roller is a flat roller, and the upper roller is a molding roller.
During one-pass rolling, the special-shaped copper strip firstly passes through the centering device, then enters the roller for rolling, and then passes through the second centering device, and the center line of the special-shaped copper strip is consistent with that of the special-shaped copper strip.
When the special-shaped copper strip is rolled in one pass, different sections of the special-shaped copper strip adopt different machining rates in different proportions, and the machining rate of a large section is 0.5% -2% greater than that of a small section.
(4) Drawing in one pass
And (3) carrying out one-time drawing on the deformed copper strip subjected to one-time rolling.
The processing rate of one-time drawing is 5-15%.
One pass drawing is continuous coil drawing.
When the special-shaped copper strip is drawn in one pass, the different thicknesses of the special-shaped copper strip adopt different processing rates in different proportions, and the processing rate of a large section is 0.5% -2% smaller than that of a small section.
After one-time drawing, the surface roughness of the special-shaped copper strip is less than 0.1 mu m.
(5) Annealing
And annealing the special-shaped copper strip which is drawn in one step at the annealing temperature of 300-500 ℃ for 6-8 hours, wherein the grain size of the prepared special-shaped copper strip is 0.007-0.015mm, the electric conductivity is more than 101% IACS, the repeated bending times of the hydrogen embrittlement test are not less than 15 times, the tensile strength is more than 220MPa, and the elongation is more than 55%.
The invention has the beneficial effects that:
1. the production method of the special-shaped copper strip realizes short-flow production of the special-shaped copper strip by adopting the production methods of upward continuous casting, continuous extrusion, one-time rolling, one-time drawing and annealing.
2. The method adopts a non-proportional processing deformation method during one-time rolling and one-time drawing deformation, and the prepared special-shaped copper strip has high dimensional precision.
3. Two sets of centering devices are adopted during one-pass rolling, and the dimensional accuracy of the special-shaped copper strip is guaranteed.
4. When the rolling is carried out in one pass, the problem of poor plate shape caused by the elastic-plastic deformation of the roller can be solved by adopting the processing rate in different proportions.
5. When the single-pass drawing is carried out, the problem of poor plate shape caused by coil drawing can be solved by adopting the processing rates which are not in the same proportion.
Drawings
Fig. 1 is a schematic diagram of the dimensional change of the copper profile strip of the present invention during the production process.
Detailed Description
The invention is further described below with reference to specific embodiments.
(1) Up-drawing continuous casting
A power frequency smelting device is adopted for up-drawing continuous casting of the copper rod, and the smelting device comprises a smelting furnace, a holding furnace, a traction device and a coiling device.
The traction device comprises a crystallizer, a graphite mold, a sheath and a traction motor.
The graphite mould is arranged at the bottom of the crystallizer, and the joint of the graphite mould and the bottom of the crystallizer is plugged by asbestos threads and coated with graphite latex to prevent air intake and copper infiltration.
The depth of the graphite mould inserted into the copper liquid is 50mm, and the temperature difference between the cooling water inlet and the cooling water outlet of the crystallizer is 15 ℃. The temperature of the smelting furnace is 1205 ℃, the temperature of the holding furnace is 1155 ℃, the voltage of the melting furnace is 420V, and the voltage of the holding furnace is 300V.
The diameter of the up-drawing continuous casting copper rod is phi 20mm, the pitch is 5mm, and the speed of the up-drawing continuous casting copper rod is 700 mm/min; the liquid level height of the copper liquid is 450 mm; the melting furnace is covered by charcoal with the thickness of 150mm, and the heat preservation furnace is covered by graphite flakes with the thickness of 30mm and is level to the upper surface of the sheath.
(2) Continuous extrusion
And continuously extruding the upward continuous casting copper rod to prepare the special-shaped copper strip blank.
Preheating a continuous extrusion tooling die at 460 ℃, and keeping the temperature for 5 hours; placing the preheated tooling die into the shoe base, placing the preheated tooling die into a guide plate, covering a pressing plate, screwing down screws, closing the shoe base, pressing a pressing cylinder, and sleeving an anti-oxidation pipe; the pressure gauge of the compaction cylinder is 25Mpa, the rotating speed of the main shaft is 3.5 turns, and hot materials are added. The hot material is 10 oxygen-free copper rods with the diameter of phi 30mm, the length of 400 mm and the temperature of 750 ℃.
The clearance between the continuous extrusion tooling die and the extrusion wheel is 0.7 mm.
The profiled copper strip billet prepared by continuous extrusion has the size of T1 being 6mm and the size of H1 being 4 mm.
(3) One pass rolling
And (3) rolling the continuously extruded special-shaped copper strip blank once.
Two-roller rolling mill is adopted during one-pass rolling, wherein the lower roller is a flat roller, and the upper roller is a molding roller.
During one-pass rolling, the special-shaped copper strip firstly passes through the centering device, then enters the roller for rolling, and then passes through the second centering device, and the center line of the special-shaped copper strip is consistent with that of the special-shaped copper strip.
During one-pass rolling, the different thicknesses of the special-shaped copper strip adopt different processing rates in different proportions.
The size of the deformed copper strip T2 after the one-pass rolling is 3.24mm, and the size of the H2 is 2.2 mm.
(4) Drawing in one pass
And (3) carrying out one-time drawing on the deformed copper strip subjected to one-time rolling.
One pass drawing is continuous coil drawing.
When the copper strip is drawn in one pass, the different thicknesses of the special-shaped copper strip adopt the processing rates in different proportions.
After one-pass drawing, the size of the special-shaped copper strip billet T3 is 3mm, and the size of the H3 is 2 mm.
(5) Annealing
And (3) annealing the profile copper strip which is drawn in one step, wherein the annealing temperature is 350 ℃, and the heat preservation time is 8 hours.
The grain size of the special-shaped copper strip prepared by the method is 0.007-0.015mm, the electric conductivity is more than 101% IACS, the repeated bending times of a hydrogen embrittlement test are 18 times, the tensile strength is 250MPa, the elongation is 60%, and the surface roughness is less than 0.1 μm.
The above-mentioned embodiments are only used for explaining the inventive concept of the present invention, and do not limit the protection of the claims of the present invention, and any insubstantial modifications of the present invention using this concept shall fall within the protection scope of the present invention.
Claims (1)
1. A production method of a special-shaped copper strip is characterized by comprising the following steps: the method comprises the following steps: upward continuous casting, continuous extrusion, one-time rolling, one-time drawing and annealing; the production method comprises the following specific steps:
(1) up-drawing continuous casting
Adopting a power frequency smelting device to carry out up-drawing continuous casting of the copper rod, wherein the smelting device comprises a smelting furnace, a holding furnace, a traction device and a coiling device; the traction device comprises a crystallizer, a graphite mold, a sheath and a traction motor; the graphite mould is arranged at the bottom of the crystallizer, and the joint of the graphite mould and the bottom of the crystallizer is plugged by asbestos threads and coated with graphite latex to prevent air intake from copper infiltration; the depth of the graphite mold inserted into the copper liquid is 30-50mm, the temperature difference of cooling water inlet and outlet of the crystallizer is 15 ℃, the temperature of a smelting furnace is 1205 ℃, the temperature of a holding furnace is 1155 ℃, the voltage of the smelting furnace is 380-420V, and the voltage of the holding furnace is 300-340V; the diameter of the upward continuous casting copper rod is phi 20mm, the pitch is 3-5 mm, and the upward continuous casting speed of the copper rod is 600-700 mm/min; the liquid level height of the copper liquid is 400-450 mm; the melting furnace is covered by charcoal with the thickness of 100-150 mm, and the heat preservation furnace is covered by graphite phosphorus sheets with the thickness of 30-40 mm and is level to the upper surface of the sheath;
(2) continuous extrusion
Preheating a continuous extrusion tooling die at 460 ℃, and keeping the temperature for 5 hours; placing the preheated tooling die into the shoe base, placing the preheated tooling die into a guide plate, covering a pressing plate, screwing down screws, closing the shoe base, pressing a pressing cylinder, and sleeving an anti-oxidation pipe; a pressure gauge of the compaction cylinder is 22-25 Mpa, the rotating speed of the main shaft is 3.5 revolutions, and hot materials are added; the clearance between the continuous extrusion tooling die and the extrusion wheel is 0.7 mm;
the cross sections of the special-shaped copper strip billet prepared by continuous extrusion and the finished special-shaped copper strip are in the same proportion; the size of the special-shaped copper strip billet T1 prepared by continuous extrusion is 6mm, and the size of the H1 is 4 mm;
(3) one pass rolling
The continuously extruded deformed copper strip blank is rolled for one time, the processing rate of the one-time rolling is 20% -50%, a two-roller rolling mill is adopted during the one-time rolling, wherein the lower roller is a flat roller, the upper roller is a profile roller, the deformed copper strip firstly passes through a centering device and then enters a roller for rolling during the one-time rolling, the profile roller and the deformed copper strip pass through a second centering device after rolling, the center lines of the profile roller and the deformed copper strip are consistent, the different sections of the deformed copper strip adopt the processing rates in different proportions during the one-time rolling, and the processing rate of a large section is 0.5% -2% greater than that of a small section; the size of the deformed copper strip T2 after the one-pass rolling is 3.24mm, and the size of the H2 is 2.2 mm;
(4) drawing in one pass
The method comprises the following steps of (1) performing one-time drawing on the deformed copper strip after one-time rolling, wherein the processing rate of the one-time drawing is 5% -15%, the one-time drawing is continuous coil drawing, the different sections of the deformed copper strip adopt different processing rates in different proportions during one-time rolling, the processing rate of a large section is 0.5% -2% greater than that of a small section, and the surface roughness of the deformed copper strip is less than 0.1 mu m after the one-time drawing; after one-time drawing, the size of the special-shaped copper strip blank T3 is 3mm, and the size of the H3 is 2 mm;
(5) annealing
Annealing the profile copper strip which is drawn for one time, wherein the annealing temperature is 300-500 ℃, and the heat preservation time is 6-8 hours;
the grain size of the special-shaped copper strip prepared by the method is 0.007-0.015mm, the electric conductivity is more than 101% IACS, the repeated bending times of the hydrogen embrittlement test are not less than 15, the tensile strength is more than 220MPa, and the elongation is more than 55%.
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| JP2012097327A (en) * | 2010-11-02 | 2012-05-24 | Hitachi Cable Ltd | Copper alloy improved in hot and cold workability, method for production thereof, and copper alloy strip or alloy foil obtained from copper alloy |
| CN102941240A (en) * | 2012-12-06 | 2013-02-27 | 天津美腾铜业有限公司 | Manufacturing technique of copper roll bar or copper strip |
| CN104959396A (en) * | 2015-08-04 | 2015-10-07 | 绍兴市力博电气有限公司 | Production process of copper strip for composite contact material |
| CN106239044A (en) * | 2016-08-04 | 2016-12-21 | 徐高磊 | A kind of copper strips production technology for LED support |
| CN107999560A (en) * | 2017-12-01 | 2018-05-08 | 浙江力博实业股份有限公司 | The preparation method of breaker copper strips |
| CN109182831A (en) * | 2018-09-28 | 2019-01-11 | 浙江力博实业股份有限公司 | It is a kind of to draw the preparation method for using copper strips |
| CN109201767A (en) * | 2018-09-28 | 2019-01-15 | 浙江力博实业股份有限公司 | A kind of production technology of power battery tab copper strips |
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2019
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Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1112462A (en) * | 1992-08-18 | 1995-11-29 | 鞍山金属材料厂 | High-accuracy shaped strip copper and its producing technology |
| CN101916624A (en) * | 2010-08-06 | 2010-12-15 | 绍兴市力博电气有限公司 | Production method of conducting copper bars for bus duct with large flakiness ratio |
| JP2012097327A (en) * | 2010-11-02 | 2012-05-24 | Hitachi Cable Ltd | Copper alloy improved in hot and cold workability, method for production thereof, and copper alloy strip or alloy foil obtained from copper alloy |
| CN102941240A (en) * | 2012-12-06 | 2013-02-27 | 天津美腾铜业有限公司 | Manufacturing technique of copper roll bar or copper strip |
| CN104959396A (en) * | 2015-08-04 | 2015-10-07 | 绍兴市力博电气有限公司 | Production process of copper strip for composite contact material |
| CN106239044A (en) * | 2016-08-04 | 2016-12-21 | 徐高磊 | A kind of copper strips production technology for LED support |
| CN107999560A (en) * | 2017-12-01 | 2018-05-08 | 浙江力博实业股份有限公司 | The preparation method of breaker copper strips |
| CN109182831A (en) * | 2018-09-28 | 2019-01-11 | 浙江力博实业股份有限公司 | It is a kind of to draw the preparation method for using copper strips |
| CN109201767A (en) * | 2018-09-28 | 2019-01-15 | 浙江力博实业股份有限公司 | A kind of production technology of power battery tab copper strips |
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