CN110076210A - A kind of preparation method of relay high-fire resistance copper strips - Google Patents
A kind of preparation method of relay high-fire resistance copper strips Download PDFInfo
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- CN110076210A CN110076210A CN201910391933.0A CN201910391933A CN110076210A CN 110076210 A CN110076210 A CN 110076210A CN 201910391933 A CN201910391933 A CN 201910391933A CN 110076210 A CN110076210 A CN 110076210A
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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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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
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Abstract
The present invention provides a kind of preparation method of relay high-fire resistance copper strips, using continuous up-casting copper bar, aligning, purging, polishing, second purging, extrusion forming, cooling, for the second time polish, batch, second of extrusion forming, cooling, third time polish, batch for the second time, the first passes, annealing, the second passes, cutting technique；The chemical component of the copper strips of preparation is in percentage by weight, hafnium content 0.005-0.05%, indium content 0.005-0.05%, silver content 0.005-0.05%, chromium content 0.005-0.05%, the ratio between content of hafnium, indium, four kinds of silver, chromium elements be 1:1:1:1, copper, hafnium, indium, silver, chromium total content be greater than 99.99%, oxygen content be less than 10ppm.
Description
Technical field
The present invention relates to a kind of preparation method of nonferrous materials more particularly to a kind of relay high-fire resistance copper strips
Preparation method.
Background technique
Relay is a kind of electric control device, is usually applied in automation control circuit, is played in circuit automatic
The effects of adjusting, safeguard protection, conversion circuit.From the point of view of China relay application field, communication and Industry Control, household electrical appliances and vapour
Vehicle is relay biggest market.To some degree, the automation that the material of relay industry and technical level reflect
It is horizontal.
The main relay such as China's communication, automobile, industry control, household electrical appliances consumes Industry Quick Development, has pulled domestic relay
The demand of device industry, the competition of relay industry from the competition of past volume production, developed to new type of relay and critical material,
The competition of the key foundations component such as special equipment research and development manufacture, therefore development is adapted to the Cu alloy material of high-end relay industry
Just seem particularly significant, do not require nothing more than Cu alloy material has outstanding performance on electric conductivity, and has high-fire resistance, is bent into
Type and outstanding lustrous surface and flatness.
Summary of the invention
The purpose of the present invention is to provide a kind of relay preparation methods of high-fire resistance copper strips, using continuous up-casting copper
Bar aligning, purging, polishing, second purging, extrusion forming, cooling, is polished for the second time, is batched, is second of extrusion forming, cold
But, third time polish, batch for the second time, the first passes, annealing, the second passes, cutting technique；The relay of preparation
The chemical component of device high-fire resistance copper strips in percentage by weight, hafnium content 0.005-0.05%, indium content 0.005-
0.05%, silver content 0.005-0.05%, chromium content 0.005-0.05%, the ratio between hafnium, indium, silver, content of four kinds of elements of chromium are
1:1:1:1, copper, hafnium, indium, silver, chromium total content be greater than 99.99%, oxygen content is less than 10ppm, thick with a thickness of 1.0-2.0mm
Spending longitudinal tolerance is ± 0.02mm, and thickness transverse direction tolerance is ± 0.002mm, width 10-300mm, width tolerance is ±
0.10mm, every meter of side camber degree of copper strips are less than 1mm, and the tensile strength of copper strips is 350-450MPa, elongation 10-
15%, conductivity is greater than 95%IACS, and heat resistance is 1.5 times of common fine copper, and softening temperature is greater than 400 DEG C.
In order to achieve the above object, the technical scheme is that
(1) continuous up-casting copper bar: power frequency continuous up-casting furnace is used, by Cu-CATH-1, fine silver, copper hafnium intermediate alloy, copper
It launches after indium intermediate alloy, the drying of copper chromium intermediate alloy into smelting apparatus, smelting apparatus includes smelting furnace, compartment, holding furnace
Three parts composition, wherein melting furnace temperature is 1150-1200 DEG C, and heat preservation furnace temperature is 1100-1150 DEG C, and compartment is equipped with online
Depassing unit, is filled with 99.996% argon gas by online depassing unit into copper liquid, and by controlled rotation graphite shaft and
Argon gas is pressed into copper liquid and is dispersed as micro-bubble, is uniformly dispersed in it in copper liquid by rotor, to reach degasification, take off
The purpose of oxygen, source outlet pressure 0.5MPa, 0.5~1.0Nm of flow3/ h, rotor speed control lead in 150~200r/min
Online depassing unit is crossed, the oxygen content in copper liquid is made to be less than 10ppm.
Smelting furnace is covered using charcoal, and compartment, holding furnace are covered using graphite flakes, using traction link seat in holding furnace
Continuous up-casting copper bar, copper bar pitch are 2.5~3.0mm, and the speed of continuous up-casting is 550-600mm/min, stop Lapie lead for
50%-55%, using fine pith, greatly stop Lapie lead improve copper bar surface quality, avoid copper bar from breaking.Continuous up-casting diameter Ф
30mm, for the cooling circulating water inflow temperature of crystallizer less than 35 DEG C, the cooling circulating water inflow and outflow temperature difference of crystallizer is small
In 8 DEG C.
The crystallizer that continuous up-casting uses be graphite material, meanwhile, internal surface of crystallizer chromium plating, chrome layer with a thickness of
0.05~0.2mm.
(2) align: curved copper bar internal residual stress is released by Ф 30mm copper bar by straightener, is eliminated
The shape defect of copper bar.
(3) it purges: using the compressed air of 0.2~0.3MPa, the pollutants such as the dust on copper bar surface being purged to clean, guarantor
Demonstrate,prove the surface quality of oxygen-free copper bar cleaning.
(4) it polishes: being polished copper bar surface using steel brush.
(5) it purges for second: using the compressed air of 0.2~0.3MPa, copper bar surface being purged；
(6) expansion deformation channel, gasket and the soft state copper rod of extrusion forming of mold extrusion forming: are passed sequentially through；It squeezes
Molding speed is 5m/min, and temperature is greater than 750 DEG C, and the diameter of the copper rod of extrusion forming preparation is 30mm.
(7) cooling: the copper rod of extrusion forming is by the anti-oxidation pipe of vacuum, using the alcohol of 10-20% and the mixed liquor of water
It is cooled down, is cooled to 30 DEG C~50 DEG C；
(8) polish for second: the roughness of copper rod is reached 0.05~0.15 by the method combined using rough polishing and essence throwing
μm；Wherein rough polishing carries out polishing pretreatment using the abrasive brush of 100~300 mesh, and essence throws the nonwoven fabric brush roll of 2000~3000 mesh；
(9) it batches: copper rod being subjected to no-core winder, wherein 500~600mm of internal diameter, 1500~2500mm of outer diameter.
(10) second of extrusion forming: expansion deformation channel, gasket and the soft state copper of extrusion forming of mold are passed sequentially through
Strip blank；
Expansion deformation channel includes first order deformation extended channel, second level deformation extended channel, third level deformation extension
Channel and the fourth stage deform extended channel, wherein the expanded- angle that the first order deforms extended channel is 5 DEG C, and expanded height is
25mm, extension width are 45mm, are extended with a thickness of 45mm；It is 125 DEG C that the second level, which deforms extended channel expanded- angle, and extension is high
Degree is 20mm, and extension width is 110mm, is extended with a thickness of 45mm；It is 155 DEG C that the third level, which deforms extended channel expanded- angle,
Expanded height is 20mm, and extension width is 280mm, is extended with a thickness of 45mm；The fourth stage deforms extended channel expanded- angle
60 DEG C, expanded height 30mm, extension width is 390mm, is extended with a thickness of 45mm.
Gasket is the contraction distortion channel gasket that the area Cu Liu and choked flow area combine, and the rush stream angle in the area Cu Liu is 40 DEG C, resistance
The choked flow angle for flowing area is 5 DEG C.
The calibrating strap height of mold is 15mm, and midpoint width is greater than most edge width 0.2mm, and midpoint width and most edge
Width be to gradually change transition, constitute " dumbbell " shape.
Die entrance thickness is greater than exit thickness size, is formed horn-like.
The speed of extrusion forming is 5m/min, and temperature is greater than 800 DEG C.
(11) cooling: the copper strip billet of extrusion forming is by the anti-oxidation pipe of vacuum, using the mixing of the alcohol and water of 10-20%
Liquid is cooled down, and copper strip billet is cooled to 30 DEG C~50 DEG C；
(12) third time polishes: using rough polishing and the method that combines of essence throwing, the roughness of copper strip billet is reached 0.05~
0.15μm；Wherein rough polishing carries out polishing pretreatment using the abrasive brush of 100~300 mesh, and essence throws the nonwoven fabric of 2000~3000 mesh
Brush roll；
(13) it batches for the second time: copper strip billet being subjected to no-core winder, wherein 500~600mm of internal diameter, outer diameter 1500~
2500mm。
(14) first passes: the working modulus of the first passes be 50-80%, the purpose of the first passes be by
Copper strips thickness is thinned, and improves the intensity and hardness of copper strips, and the thickness transverse direction tolerance of copper strips is made to be less than ± 0.002mm.First passage
Mill speed be 150-200m/min, rolling forward pull is 16-18KN, and rolling backward pull is 20-25KN, and when rolling uses
5% emulsion is cooling, is purged using the compressed air of 0.3-0.5MPa, and emulsion is purged completely, pickling is not needed.
(15) it anneals: the copper strips after the first passes is annealed, annealing temperature is 450 DEG C, keeps the temperature 6 hours.It moves back
Gas shield is used when fiery, using the mixed gas of 25% hydrogen and 75% nitrogen.
(16) second passes: the working modulus of the second passes is respectively 20-30%, the purpose of the second passes
It is the template for controlling copper strips, improves the intensity and hardness of copper strips, the thickness transverse direction tolerance of copper strips is made to be less than ± 0.002mm.Second
The mill speed of passage is 80-100m/min, and rolling forward pull is 10-12KN, and rolling backward pull is 15-16KN.It rolls for the second time
It is cooling using 7% emulsion when processed, it is purged using the compressed air of 0.5-0.6MPa, emulsion is purged completely, no
Need pickling.
(17) cut: blade drafts is the 50% of copper strips thickness when cutting, and the gap of slitting blade is copper strips thickness
10%.
The beneficial effects of the present invention are:
1. the chemical component and content of Optimization of Copper band, the copper strips heat resistance of preparation is 1.5 times of common pure copper strips, softening
Temperature is greater than 400 DEG C.
2. the copper strips of preparation is had excellent performance, copper strips with a thickness of 1.0-2.0mm, thickness longitudinal tolerance is ± 0.02mm, thick
Spending lateral tolerance is ± 0.002mm, and width 10-300mm, width tolerance is ± 0.10mm, every meter of the side camber degree of copper strips
Less than 1mm, the tensile strength of copper strips is 350-450MPa, and elongation 10-15%, conductivity is greater than 95%IACS.
3. using continuous up-casting copper bar, aligning, purging, polishing, second of purging, extrusion forming, cooling, throwing for second
Light batches, second of extrusion forming, cooling, polishes, batches for the second time for the third time, the first passes, annealing, the second passage
The technique of rolling, cutting, does not need the techniques such as pickling, copper strip billet milling face, has saved a large amount of time and energy consumption.
Specific embodiment
A kind of preparation method of relay high-fire resistance copper strips, relay high-fire resistance copper strips chemistry at
Point in percentage by weight, hafnium content 0.01%, indium content 0.01%, silver content 0.01%, chromium content 0.01%, copper, hafnium,
Indium, silver, chromium total content be greater than 99.99%, oxygen content be less than 10ppm.
The preparation method is:
(1) continuous up-casting copper bar: power frequency continuous up-casting furnace is used, by Cu-CATH-1, fine silver, copper hafnium intermediate alloy, copper
It launches after indium intermediate alloy, the drying of copper chromium intermediate alloy into smelting apparatus, smelting apparatus includes smelting furnace, compartment, holding furnace
Three parts composition, wherein melting furnace temperature is 1150-1200 DEG C, and heat preservation furnace temperature is 1100-1150 DEG C, and compartment is equipped with online
Depassing unit, is filled with 99.996% argon gas by online depassing unit into copper liquid, and by controlled rotation graphite shaft and
Argon gas is pressed into copper liquid and is dispersed as micro-bubble, is uniformly dispersed in it in copper liquid by rotor, to reach degasification, take off
The purpose of oxygen, source outlet pressure 0.5MPa, 0.5~1.0Nm of flow3/ h, rotor speed control lead in 150~200r/min
Online depassing unit is crossed, the oxygen content in copper liquid is made to be less than 10ppm.
Smelting furnace is covered using charcoal, and compartment, holding furnace are covered using graphite flakes, using traction link seat in holding furnace
Continuous up-casting copper bar, copper bar pitch are 2.5~3.0mm, and the speed of continuous up-casting is 550-600mm/min, stop Lapie lead for
50%-55%, using fine pith, greatly stop Lapie lead improve copper bar surface quality, avoid copper bar from breaking.Continuous up-casting diameter Ф
30mm, for the cooling circulating water inflow temperature of crystallizer less than 35 DEG C, the cooling circulating water inflow and outflow temperature difference of crystallizer is small
In 8 DEG C.
The crystallizer that continuous up-casting uses be graphite material, meanwhile, internal surface of crystallizer chromium plating, chrome layer with a thickness of
0.05~0.2mm.
(2) align: curved copper bar internal residual stress is released by Ф 30mm copper bar by straightener, is eliminated
The shape defect of copper bar.
(3) it purges: using the compressed air of 0.3MPa, the pollutants such as the dust on copper bar surface being purged to clean, guarantee nothing
The surface quality of oxygen copper bar cleaning.
(4) it polishes: being polished copper bar surface using steel brush.
(5) it purges for second: using the compressed air of 0.3MPa, copper bar surface being purged；
(6) expansion deformation channel, gasket and the soft state copper rod of extrusion forming of mold extrusion forming: are passed sequentially through；It squeezes
Molding speed is 5m/min, and temperature is greater than 750 DEG C, and the diameter of the copper rod of extrusion forming preparation is 30mm.
(7) cooling: the copper rod of extrusion forming is by the anti-oxidation pipe of vacuum, using the alcohol of 10-20% and the mixed liquor of water
It is cooled down, is cooled to 30 DEG C~50 DEG C；
(8) polish for second: the roughness of copper rod is reached 0.05~0.15 by the method combined using rough polishing and essence throwing
μm；Wherein rough polishing carries out polishing pretreatment using the abrasive brush of 100~300 mesh, and essence throws the nonwoven fabric brush roll of 2000~3000 mesh；
(9) it batches: copper rod being subjected to no-core winder, wherein 500~600mm of internal diameter, 1500~2500mm of outer diameter.
(10) second of extrusion forming: expansion deformation channel, gasket and the soft state copper of extrusion forming of mold are passed sequentially through
Strip blank；
Expansion deformation channel includes first order deformation extended channel, second level deformation extended channel, third level deformation extension
Channel and the fourth stage deform extended channel, wherein the expanded- angle that the first order deforms extended channel is 5 DEG C, and expanded height is
25mm, extension width are 45mm, are extended with a thickness of 45mm；It is 125 DEG C that the second level, which deforms extended channel expanded- angle, and extension is high
Degree is 20mm, and extension width is 110mm, is extended with a thickness of 45mm；It is 155 DEG C that the third level, which deforms extended channel expanded- angle,
Expanded height is 20mm, and extension width is 280mm, is extended with a thickness of 45mm；The fourth stage deforms extended channel expanded- angle
60 DEG C, expanded height 30mm, extension width is 390mm, is extended with a thickness of 45mm.
Gasket is the contraction distortion channel gasket that the area Cu Liu and choked flow area combine, and the rush stream angle in the area Cu Liu is 40 DEG C, resistance
The choked flow angle for flowing area is 5 DEG C.
The calibrating strap height of mold is 15mm, and midpoint width is greater than most edge width 0.2mm, and midpoint width and most edge
Width be to gradually change transition, constitute " dumbbell " shape.
Die entrance thickness is greater than exit thickness size, is formed horn-like.
The speed of extrusion forming is 5m/min, and temperature is greater than 800 DEG C.
(11) cooling: the copper strip billet of extrusion forming is by the anti-oxidation pipe of vacuum, using the mixing of the alcohol and water of 10-20%
Liquid is cooled down, and copper strip billet is cooled to 30 DEG C~50 DEG C；
(12) third time polishes: using rough polishing and the method that combines of essence throwing, the roughness of copper strip billet is reached 0.05~
0.15μm；Wherein rough polishing carries out polishing pretreatment using the abrasive brush of 100~300 mesh, and essence throws the nonwoven fabric of 2000~3000 mesh
Brush roll；
(13) it batches for the second time: copper strip billet being subjected to no-core winder, wherein 500~600mm of internal diameter, outer diameter 1500~
2500mm。
(14) first passes: the working modulus of the first passes be 50-80%, the purpose of the first passes be by
Copper strips thickness is thinned, and improves the intensity and hardness of copper strips, and the thickness transverse direction tolerance of copper strips is made to be less than ± 0.002mm.First passage
Mill speed be 150-200m/min, rolling forward pull is 16-18KN, and rolling backward pull is 20-25KN, and when rolling uses
5% emulsion is cooling, is purged using the compressed air of 0.3-0.5MPa, and emulsion is purged completely, pickling is not needed.
(15) it anneals: the copper strips after the first passes is annealed, annealing temperature is 450 DEG C, keeps the temperature 6 hours.It moves back
Gas shield is used when fiery, using the mixed gas of 25% hydrogen and 75% nitrogen.
(16) second passes: the working modulus of the second passes is respectively 20-30%, the purpose of the second passes
It is the template for controlling copper strips, improves the intensity and hardness of copper strips, the thickness transverse direction tolerance of copper strips is made to be less than ± 0.002mm.Second
The mill speed of passage is 80-100m/min, and rolling forward pull is 10-12KN, and rolling backward pull is 15-16KN.It rolls for the second time
It is cooling using 7% emulsion when processed, it is purged using the compressed air of 0.5-0.6MPa, emulsion is purged completely, no
Need pickling.
(17) cut: blade drafts is the 50% of copper strips thickness when cutting, and the gap of slitting blade is copper strips thickness
10%.
The copper strips of this example preparation is ± 0.02mm with a thickness of 1.0-2.0mm, thickness longitudinal tolerance, and thickness transverse direction tolerance is
± 0.002mm, width 10-300mm, width tolerance are ± 0.10mm, and every meter of side camber degree of copper strips is less than 1mm, copper strips
Tensile strength be 350-450MPa, elongation 10-15%, conductivity be greater than 95%IACS, heat resistance is common fine copper
1.5 times, softening temperature be greater than 400 DEG C.
Claims (1)
1. a kind of relay preparation method of high-fire resistance copper strips, it is characterised in that: the chemical component of the copper strips according to
Weight percent meter, hafnium content 0.005-0.05%, indium content 0.005-0.05%, silver content 0.005-0.05%, chromium content
0.005-0.05%, the ratio between hafnium, content of indium, four kinds of silver, chromium elements are 1:1:1:1, and copper, hafnium, indium, silver, the total content of chromium are big
In 99.99%, oxygen content is less than 10ppm；The preparation method is continuous up-casting copper bar, aligning, purging, polishing, second
Purging, extrusion forming, cooling, polish, batch for the second time, second of extrusion forming, cooling, third time polish, batch for the second time,
First passes, annealing, the second passes, cutting；The copper content of the copper strips of preparation is greater than 99.99%, and oxygen content is less than
3ppm, with a thickness of 1.0-2.0mm, thickness longitudinal tolerance is ± 0.02mm, and thickness transverse direction tolerance is ± 0.002mm, width 10-
300mm, width tolerance are ± 0.10mm, and every meter of side camber degree of copper strips is less than 1mm, and the tensile strength of copper strips is 300-
320MPa, elongation 10-15%, conductivity are greater than 100%IACS；
The preparation method specifically includes:
(1) continuous up-casting copper bar: using power frequency continuous up-casting furnace, will be in Cu-CATH-1, fine silver, copper hafnium intermediate alloy, copper and indium
Between alloy, copper chromium intermediate alloy drying after launch into smelting apparatus, smelting apparatus includes smelting furnace, compartment, holding furnace three
It is grouped as, wherein melting furnace temperature is 1150-1200 DEG C, and heat preservation furnace temperature is 1100-1150 DEG C, and compartment is equipped with online degasification
Device, is filled with 99.996% argon gas by online depassing unit into copper liquid, and by controlled rotation graphite shaft and rotor,
Argon gas is pressed into copper liquid and is dispersed as micro-bubble, is uniformly dispersed in it in copper liquid, to reach the mesh of degasification, deoxidation
, source outlet pressure 0.5MPa, 0.5~1.0Nm of flow3/ h, rotor speed control is in 150~200r/min, by online
Depassing unit makes the oxygen content in copper liquid be less than 10ppm；Smelting furnace is covered using charcoal, and compartment, holding furnace use graphite flakes
Covering, using traction link seat, continuous up-casting copper bar, copper bar pitch are 2.5~3.0mm in holding furnace, and the speed of continuous up-casting is
550-600mm/min stops Lapie and leads as 50%-55%, using fine pith, stops Lapie greatly and leads to improve copper bar surface quality, avoid
Copper bar is broken.Continuous up-casting diameter Ф 30mm, less than 35 DEG C, the cooling of crystallizer follows the cooling circulating water inflow temperature of crystallizer
Ring water inflow and outflow temperature difference is less than 8 DEG C；The crystallizer that continuous up-casting uses is graphite material, meanwhile, internal surface of crystallizer
Chromium plating, chrome layer with a thickness of 0.05~0.2mm；
(2) align: curved copper bar internal residual stress is released by Ф 30mm copper bar by straightener, eliminates copper bar
Shape defect；
(3) it purges: using the compressed air of 0.2~0.3MPa, the pollutants such as the dust on copper bar surface being purged to clean, guarantee nothing
The surface quality of oxygen copper bar cleaning；
(4) it polishes: being polished copper bar surface using steel brush；
(5) it purges for second: using the compressed air of 0.2~0.3MPa, copper bar surface being purged；
(6) expansion deformation channel, gasket and the soft state copper rod of extrusion forming of mold extrusion forming: are passed sequentially through；Extrusion forming
Speed be 5m/min, temperature be greater than 750 DEG C, extrusion forming preparation copper rod diameter be 30mm；
(7) cooling: the copper rod of extrusion forming is carried out by the anti-oxidation pipe of vacuum using the alcohol of 10-20% and the mixed liquor of water
It is cooling, it is cooled to 30 DEG C~50 DEG C；
(8) polish for second: the roughness of copper rod is reached 0.05~0.15 μm by the method combined using rough polishing and essence throwing；
Wherein rough polishing carries out polishing pretreatment using the abrasive brush of 100~300 mesh, and essence throws the nonwoven fabric brush roll of 2000~3000 mesh；
(9) it batches: copper rod being subjected to no-core winder, wherein 500~600mm of internal diameter, 1500~2500mm of outer diameter；
(10) second of extrusion forming: expansion deformation channel, gasket and the soft state copper plate/strip of extrusion forming of mold are passed sequentially through
Base；Expansion deformation channel include the first order deformation extended channel, the second level deformation extended channel, the third level deformation extended channel and
The fourth stage deforms extended channel, wherein the expanded- angle that the first order deforms extended channel is 5 DEG C, expanded height 25mm, extension
Width is 45mm, is extended with a thickness of 45mm；It is 125 DEG C, expanded height 20mm that the second level, which deforms extended channel expanded- angle,
Extension width is 110mm, is extended with a thickness of 45mm；It is 155 DEG C that the third level, which deforms extended channel expanded- angle, and expanded height is
20mm, extension width are 280mm, are extended with a thickness of 45mm；It is 60 DEG C that the fourth stage, which deforms extended channel expanded- angle, and extension is high
Degree is 30mm, and extension width is 390mm, is extended with a thickness of 45mm；Gasket is that the contraction that the area Cu Liu and choked flow area combine becomes
Shape channel gasket, the rush stream angle in the area Cu Liu are 40 DEG C, and the choked flow angle in choked flow area is 5 DEG C, and the calibrating strap height of mold is 15mm, in
Point width is greater than most edge width 0.2mm, and midpoint width and the width of most edge are to gradually change transition, constitute " dumbbell " shape
Shape, die entrance thickness are greater than exit thickness size, are formed horn-like；The speed of extrusion forming is 5m/min, and temperature is
Greater than 800 DEG C；
(11) cooling: the copper strip billet of extrusion forming by the anti-oxidation pipe of vacuum, using 10-20% alcohol and water mixed liquor into
Row cooling, is cooled to 30 DEG C~50 DEG C for copper strip billet；
(12) third time polishes: the roughness of copper strip billet is reached 0.05~0.15 μ by the method combined using rough polishing and essence throwing
m；Wherein rough polishing carries out polishing pretreatment using the abrasive brush of 100~300 mesh, and essence throws the nonwoven fabric brush roll of 2000~3000 mesh；
(13) it batches for the second time: copper strip billet being subjected to no-core winder, wherein 500~600mm of internal diameter, 1500~2500mm of outer diameter；
(14) first passes: the working modulus of the first passes is 50-80%, and the purpose of the first passes is by copper strips
Thickness is thinned, and improves the intensity and hardness of copper strips, and the thickness transverse direction tolerance of copper strips is made to be less than ± 0.002mm.First passage is rolled
Speed processed is 150-200m/min, and rolling forward pull is 16-18KN, and rolling backward pull is 20-25KN, using 5% when rolling
Emulsion is cooling, is purged using the compressed air of 0.3-0.5MPa, and emulsion is purged completely, pickling is not needed；
(15) it anneals: the copper strips after the first passes is annealed, annealing temperature is 450 DEG C, 6 hours is kept the temperature, when annealing
Using gas shield, using the mixed gas of 25% hydrogen and 75% nitrogen；
(16) second passes: the working modulus of the second passes is respectively 20-30%, and the purpose of the second passes is control
The template of copper strips processed improves the intensity and hardness of copper strips, and the thickness transverse direction tolerance of copper strips is made to be less than ± 0.002mm.Second passage
Mill speed be 80-100m/min, rolling forward pull be 10-12KN, rolling backward pull be 15-16KN, for the second time rolling when
It is cooling using 7% emulsion, it is purged using the compressed air of 0.5-0.6MPa, emulsion is purged completely, is not needed
Pickling；
(17) cut: blade drafts is the 50% of copper strips thickness when cutting, and the gap of slitting blade is the 10% of copper strips thickness；
For the copper strips of the preparation method preparation with a thickness of 1.0-2.0mm, thickness longitudinal tolerance is ± 0.02mm, thickness transverse direction tolerance
For ± 0.002mm, width 10-300mm, width tolerance is ± 0.10mm, and every meter of side camber degree of copper strips is less than 1mm, copper
The tensile strength of band is 350-450MPa, and elongation 10-15%, for conductivity greater than 95%IACS, heat resistance is common pure
1.5 times of copper, softening temperature are greater than 400 DEG C.
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| CN201910391933.0A CN110076210A (en) | 2019-05-13 | 2019-05-13 | A kind of preparation method of relay high-fire resistance copper strips |
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Cited By (1)
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Application publication date: 20190802 |