CN109821927A - A kind of production method of major diameter White Copper Tubes - Google Patents
A kind of production method of major diameter White Copper Tubes Download PDFInfo
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Abstract
The invention belongs to metal material technology processing technology of preparing fields, more particularly to a kind of production method of major diameter White Copper Tubes, production major diameter White Copper Tubes mainly use " the solid ingot casting of D.C.casting-perforation extruding-multi-pass expanding drawing-multi-pass undergauge drawing-annealing " technique at present, it is low that there are lumber recoverys, it is at high cost, process flow is long, large-scale extrusion equipment invests the problems such as big, the present invention proposes to produce major diameter White Copper Tubes using the method for " the cold combination vertical mould continuously casting-thermal expansion-undergauge rolling-annealing of heat ", with high production efficiency, process flow is short, lumber recovery is high, the advantages that at low cost, tubing has uniform wall thickness good, the advantages such as single weight long length length, it is suitable for the industrialized production of major diameter White Copper Tubes.
Description
Technical field
The invention belongs to metal material processing technology of preparing fields, are related to a kind of major diameter copper-nickel alloy tubing production method.
Background technique
Copper-nickel alloy has excellent mechanical property, good heating conduction, corrosion resistance and anti-bioadhesive property, extensively
Applied to fields such as thermal power generation, ship, sea water desalinations.Seawaterline pipe (including pipeline, flange, valve, ripple at present
Pipe) size range be generally 50~310mm of outer diameter, 3~10mm of wall thickness, be the important feature in the fields such as sea water desalination, ship
Component [Zhang Wenyu, the status and trend of naval vessel piping material, new material industry, 2011, No .2 .62~65 p].With
The rapid development of the marine industries such as China's sea water desalination, ship, especially Chinese large-sized ship, the ship of war enter in recent years
High speed is built the phase, high anti-corrosion, high-precision, the demand rapid growth of major diameter copper-nickel alloy tubing, but production difficulty is big, especially
It is the White Copper Tubes of diameter phi 300mm or more, only has a few countries such as Germany, South Korea that can produce in batches in high precision, greatly in the world
Diameter copper-nickel alloy tubing, most of the country rely on import.
Currently, domestic major diameter White Copper Tubes mainly use " the solid ingot casting of the D.C.casting-perforation extruding-expanding drawing of pickling-
Pull out-intermediate annealing-undergauge drawing-annealing " technique (referred to as " squeezed drawing " technique) [see: Wang Hua magnitude, a kind of major diameter
The process for making of White Copper Tubes, Chinese invention patent, grant number ZL200710054272 .X；Chen Qin, Liu Guanglong, Li Juan, greatly
The product development of bore White Copper Tubes and technical study, Shanghai non-ferrous metal, 2013, Vol. 34, No. 2, p. 55~58] it is given birth to
It produces.However, being had the following problems using " extruding-expanding stretching-undergauge stretches " technique:
(1) equipment investment is big, and the pipe of production diameter phi 300mm or more needs 5000 tons or more of large-size extruder；
(2) extrusion tube blank is eccentric serious, using it is expanding be stretching in enlarged diameter while, tube wall thickness can be further amplified not
The uniformity easily causes scrap of the product；
(3) expanding/undergauge stretching single pass heavy deformation is small, and processing passage is more, also needs intermediate annealing, process flow is long；
(4) finished product rate is low (less than 30%), high production cost.
" horizontal casting-drawing " method is a kind of large diameter thin wall copper-nickel alloy pipe production method [Jiang Yanbin, Liu developed recently
Xinhua, Xie Jianxin, Mao Xiaodong, a kind of large diameter thin wall copper-nickel alloy tubing short-flow production method, Chinese patent, grant number CN
105312353 B], this method has axial orientation columanar structure hollow bloom by the cold combined horizontal continuous casting preparation of heat, then
Drawing is carried out to hollow bloom, produces major diameter White Copper Tubes, the method compares " extruding-expanding stretching-undergauge stretches " method,
Process flow is substantially shortened, and the short route preparation of large diameter thin wall copper-nickel alloy tubing is realized.But this method is in preparation major diameter
It has some disadvantages and limitation, is mainly shown as especially more than the pipe of 300 or more φ:
(1) since horizontal casting tubing receives the influence of gravity, upper and lower intensity of cooling is different, and pipe generates solidifying in continuous casting process
Gu nonuniform organization phenomenon, while will also result in the increase of continuously cast billet for pipe-making wall thickness deviation, the more big this influence moon of diameter is obvious；
(2) due to just determining that the diameter of continuously cast billet for pipe-making will be consistently greater than finished product tubing using " horizontal casting-rolling " method, because
This when production tube material is relatively large in diameter (> 300mm), the high quality thin-walled White Copper Tubes difficulty of horizontal casting φ 300mm or more compared with
Greatly.
Based on the above background, the present invention proposes to produce big specification copper-nickel alloy using the cold combination vertical mould continuous casting process of heat
Pipe carries out expanding processing to continuously cast billet for pipe-making using thermal expansion technique, carries out tube reducing to thermal expansion pipe using periodic cold rolling and subtract
Wall rolling, and then realize major diameter, high-precision, the production of high quality copper-nickel alloy tubing short route, solve traditional major diameter copper-nickel alloy tubing
Long flow path, lumber recovery be low, the problems such as at high cost.
Summary of the invention:
The purpose of the present invention is for major diameter copper-nickel alloy tubing traditional processing technology long flow path, lumber recovery is low, at high cost the problems such as,
And horizontal continuous casting tube blank evenness of wall thickness is lower, the lesser problem of diameter, provides a kind of with spies such as high yield, low costs
The major diameter copper-nickel alloy tubing short-flow production method of point.
To achieve the above object, the invention adopts the following technical scheme: this method is continuous using the cold combination vertical mould of heat
Casting technique produce surfaces externally and internally it is highly polished, evenness of wall thickness is high, dense structure, with the white of axial orientation columanar structure
Copper hollow bloom, it is expanding to hollow bloom progress using thermal expansion technique, it is contracted using periodic cold-rolling mill to thermal expansion pipe
Diameter rolling, is prepared the major diameter White Copper Tubes of diameter > φ 300mm.
According to the embodiment of the present disclosure, the production method specifically includes that steps are as follows:
S1: hollow using the cold combination vertical mould continuous metal cast process casting 100~450mm of outer diameter φ of heat, the copper-nickel alloy of 5~30mm of wall thickness
Pipe, the copper-nickel alloy hollow bloom be from top to bottom vertically continuously casting and go out, obtain with axial orientation column crystal
The copper-nickel alloy hollow bloom of tissue；
S2: it is expanding using the progress of thermal expansion technique that S1 is obtained into big specification copper-nickel alloy hollow bloom；
S3: undergauge rolling is carried out to the copper-nickel alloy hollow bloom after expanding in S2；
S4: the tubing that undergauge in S3 is rolled carries out finished product bright annealing, and realization regulates and controls the tissue and performance of tubing, full
Sufficient actual operation requirements.
According to the embodiment of the present disclosure, the parameter of the cold combination vertical continuous casting process of heat in the S1 are as follows: holding temperature is
1150~1300 DEG C, time of repose be 30 minutes, 1000~1250 DEG C of heat type temperature, primary cooling water 5~800L/min of flow,
Secondary cooling 5~1000L/min of water flow, 20~500mm/min of hauling speed.
According to the embodiment of the present disclosure, the S2's specifically comprises the processes of:
Firstly, big specification copper-nickel alloy hollow bloom is mounted on the hydraulic delivery device of copper alloy tube, expanding core print is fixed,
It is spare；
Secondly, starting heating device by temperature control system, while starting the hydraulic push mechanism urges pipe of copper alloy tube
It is moved to expanding core print direction, is heated by temperature control system starting annular cooling when the end of pipe enters heating zone
Device is cooled down in the copper alloy tube in non-heated region, and hydraulic delivery device continues to press on copper alloy tube to expanding
The movement of core print direction, enters expanding core print inside copper alloy tube, because the heating part of copper alloy tube is by expanding core
The extruding of the expanding mode of taper of head, copper alloy tube inner wall generate compression radially from inside to outside, make copper alloy tube
It is carried out according to preset ratio expanding.
According to the embodiment of the present disclosure, the expanding technological parameter are as follows: heating temperature is 200~800 DEG C, expanding core print mould
Having unilateral taper is 5~20 °, and expanding than being 1.1~1.4, expanding speed is 30~300mm/min.
According to the embodiment of the present disclosure, undergauge rolling is rolled using two rollers or three roller periodic cold-rolling mills in the S3,
Rolling processing lengthening coefficient is 1.2~5.
According to the embodiment of the present disclosure, annealing process in the S4 specifically: soft 700~900 DEG C of state product annealing temperature, move back
The fiery time is 0.5~2h；550~700 DEG C of half-hard state product annealing temperature, annealing time are 0.5~2h；Annealing Protection atmosphere is
1~3%H2, remaining as N2。
Advantages of the present invention: the cold combination vertical mould continuous casting process of heat proposed by the present invention is used, in freezing interface
Forward position forms high-temperature gradient, forms straight solid liquid interface, is conducive to the floating and exclusion of gas and impurity element in melt,
Prepared copper-nickel alloy pipe dense structure, ingredient are uniform.Slab axially by gravity influenced identical, intensity of cooling is identical, solidification
Even tissue, pipe wall thickness deviation is small, can prepare the major diameter copper-nickel alloy continuously cast billet for pipe-making of high quality；
Using thermal expansion technique proposed by the present invention, can quickly White Copper Tubes be carried out with expanding, enlarged-diameter ratio height, big portion
Being in charge of material only needs single is expanding can meet following process requirement, and high production efficiency is particularly suitable for production diameter > φ 300mm's
Super-large diameter White Copper Tubes；
Thermal expansion is rolled using periodic cold rolling using proposed by the present invention, has the advantages that processing capacity is big, high-efficient,
Tubing is by two-way compression in rolling processing, and tube rolling dense structure, function admirable, periodic cold rolling precision is higher, size of pipe and tubing
Deviation is small；
Major diameter copper-nickel alloy is produced using " the cold combination vertical continuously casting-thermal expansion-undergauge rolling of heat " method proposed by the present invention
Pipe, uniform wall thickness, dense structure, process flow is short, high production efficiency, and lumber recovery is high, up to 70% or more, can be greatly reduced big
The manufacturing cost of diameter White Copper Tubes.
Detailed description of the invention:
Fig. 1 is a kind of process flow chart of the production method of major diameter White Copper Tubes of the present invention.
Fig. 2 is the structural schematic diagram of the cold combination vertical mould continuous casting equipment of heat.
Fig. 3 is the structural schematic diagram of expander.
In figure:
1. melting furnace, 2. metaideophone slots, 3. level monitoring devices, 4. external molds, 5. attemperators, 6. plugs, 7. first add
Thermal, 8. first temperature monitoring device, 9. water cooling copper sleeves, 10. secondary cooling apparatus, 11. dummy bar heads, 12. draggers,
13. dummy bar, 14. sawing machines, the hydraulic delivery device of 15. copper alloy tubes, 16. expanding copper-nickel alloy pipes, 17. expanding cores
Head, 18. ring type cooling devices, 19. secondary heating mechanisms, 20. core print mandrils, 21. core print entrances, 22. core prints are expanding
Section, 23. core print sizing sections.
Specific embodiment
Technical solution of the present invention is described further combined with specific embodiments below.
As shown in Figure 1, a kind of production method of major diameter White Copper Tubes of the present invention, this method is using the cold combination vertical mould of heat
Continuous casting process production surfaces externally and internally is highly polished, evenness of wall thickness is high, dense structure, has axial orientation columanar structure
Big specification copper-nickel alloy hollow bloom, using thermal expansion technique to hollow bloom carry out it is expanding, using periodic cold-rolling mill to thermal expansion
Diameter pipe carries out undergauge rolling, produces major diameter (the especially super-large diameter of diameter > φ 300mm) White Copper Tubes.
The production method specifically includes that steps are as follows:
S1: hollow using the cold combination vertical mould continuous metal cast process casting 100~450mm of outer diameter φ of heat, the copper-nickel alloy of 5~30mm of wall thickness
Pipe, the copper-nickel alloy hollow bloom be from top to bottom vertically continuously casting and go out, obtain with axial orientation column crystal
The copper-nickel alloy hollow bloom of tissue；
S2: it is expanding using the progress of thermal expansion technique that S1 is obtained into big specification copper-nickel alloy hollow bloom；
S3: undergauge rolling is carried out to the copper-nickel alloy hollow bloom after expanding in S2；
S4: the tubing that undergauge in S3 is rolled carries out finished product bright annealing, and realization regulates and controls the tissue and performance of tubing, full
Sufficient actual operation requirements.
The cold combination vertical continuous casting process of heat in the S1 specifically comprises the processes of:
S1.1: all parts are installed in place on casting platform, primary cooling water is injected into water cooling copper sleeve；
S1.2: starting first heater preheats the soaking zone of the external mold；
Copper alloy in melting furnace is placed in fusing again, obtains copper alloy solution, stopper rod flow control structure molten alloyed copper is opened and passes through
Metaideophone slot is input to inside outer membrane, and molten alloyed copper is made to be located at soaking zone, and it is high to monitor copper alloy liquid level by tank level control system
Degree, graphite flakes or coverture covering are placed on molten alloyed copper liquid level to be prevented from aoxidizing, and stands a period of time；
S1.3: starting casting mold heating device makes heat type temperature be maintained at certain the continuous heating of the casting mold bringing-up section of external mold
Temperature passes through；
S1.4: the copper alloy solution after being heated enters between the first cooling section external mold and plug under gravity
Gap makes the position of solid-liquid interface be in the transition region of casting mold bringing-up section and the first cold mould section, in the cooling lower mold of water cooling copper sleeve
Major diameter alloy pipe stock is obtained, traction mechanism is started, major diameter alloy pipe stock is obtained with certain initial hauling speed traction casting mold；
S1.5: open secondary cooling water installations, to casting mold obtain major diameter alloy pipe stock carry out secondary cooling, by sawing machine into
Row scale sawing obtains major diameter copper-nickel alloy tubing.
Parameter in the S1.1-S1.5 are as follows: holding temperature is 1150~1300 DEG C, and time of repose is 30 minutes, heat type
1000~1250 DEG C of temperature, primary cooling water 5~800L/min of flow, secondary cooling 5~1000L/min of water flow, traction speed
Spend 20~500mm/min.
The S2's specifically comprises the processes of:
S2.1: pipe being mounted on the hydraulic delivery device of copper alloy tube, expanding core print is fixed, spare；
S2.2: secondly, starting heating device by temperature control system, while starting the hydraulic push mechanism urges of copper alloy tube
Pipe is moved to expanding core print direction, is heated by temperature control system starting annular when the end of pipe enters heating zone
Cooling device is cooled down in the copper alloy tube in non-heated region, hydraulic delivery device continue to press on copper alloy tube to
Expanding core print direction movement, enters expanding core print inside copper alloy tube, because the heating part of copper alloy tube is expanded
The extruding of the expanding mode of the taper of diameter core print, copper alloy tube inner wall generate compression radially from inside to outside, make copper alloy
Pipe carries out expanding according to preset ratio.
Specific process parameter in above-mentioned technique are as follows: heating temperature is 200~800 DEG C, the expanding unilateral taper of core head mould
It is 5~20 °, expanding than being 1.1~1.4, expanding speed is 30~300mm/min.
Periodic cold rolling processing lengthening coefficient is 1.2~5 in the S3.
Annealing process in the S4 specifically: soft 700~900 DEG C of state product annealing temperature, annealing time be 0.5~2h or
550~700 DEG C of half-hard state product annealing temperature, annealing time are 0.5~2h；Annealing Protection atmosphere is 1~3%H2, remaining as
N2。
As shown in Fig. 2, the cold combination vertical mould continuous casting equipment of heat of the cold combination vertical mould continuous metal cast process of heat, described
Continuous casting installation for casting includes:
A kind of continuous casting installation for casting of major diameter White Copper Tubes, the continuous casting installation for casting include:
Melting furnace is used for melting copper alloy raw material；
Metaideophone slot, for carrying out water conservancy diversion to the molten alloyed copper after fusing；
External mold, for storing molten alloyed copper；
Plug is placed in the inside of the external mold, and there are gaps between the lateral wall of the plug and the inner sidewall of external mold, are used for
Cooperate outer mold forming major diameter copper alloy；
Level monitoring device, the liquid level for the molten alloyed copper in external mold described in real-time monitoring change；
First heater is realized and is kept the temperature to the molten alloyed copper in external mold for preheating to external mold；
Casting mold heating device, setting is in the attemperator lower end, for closing to the copper entered between external mold and plug gap
Golden melt carries out casting mold heating；
- the first temperature monitoring device, for monitoring the temperature change of casting mold bringing-up section in real time；
Water cooling copper sleeve, for being cooled down for the first time to major diameter compo pipe after molding；
Secondary cooling apparatus, for carrying out secondary cooling to major diameter compo pipe after molding.
Wherein, the bottom center position inside the melting furnace is equipped with fluid hole, and the fluid hole is equipped with stopper rod flow control
Structure；
The fluid hole is connected to one end that the level being arranged in the fusing furnace bottom goes out liquid stream road, the horizontal liquid stream out
The other end in road is connected to one end of the metaideophone slot, and the metaideophone slot other end is placed in inside the external mold；
The external mold is divided into soaking zone, casting mold bringing-up section and the first cooling section from top to bottom, and the attemperator setting exists
On the lateral wall of the soaking zone, the casting mold heating device is arranged on the lateral wall of the casting mold bringing-up section, the water cooling
Copper is set on the lateral wall of first cooling section；The lower section of the water cooling copper sleeve is arranged in the secondary cooling apparatus
On the lateral wall of one cooling section；
The level monitoring device is arranged on the side wall of the external mold, the level monitoring device and the stopper rod flow control structure
The probe of control connection, the level monitoring device is arranged inside the external mold；
First temperature monitoring device is arranged on the side wall of casting mold bringing-up section of the external mold；
The plug is placed in inside the external mold, and is located at casting mold bringing-up section and the first cooling section；
The exit of the external mold bottom is arranged in the dummy bar head, and the dummy bar head is connect with dummy bar, the dummy bar
Two sides are equipped with dragger；Sawing machine is located at the lower end of the dummy bar.
According to the embodiment of the present disclosure, the continuous casting installation for casting of the major diameter White Copper Tubes further includes insulating layer, the insulating layer packet
Overlay on the lateral wall of the external mold of the soaking zone and casting mold bringing-up section, the insulating layer for refractory material pours and
At the external mold and plug are all made of graphite and are made；The length of the casting mold bringing-up section is 30~100mm；First cold mould
The length of section is 50~150mm.
According to the embodiment of the present disclosure, the diameter ratio of major diameter compo pipe is 0.5 after the water cooling copper sleeve height and molding
~0.8.
According to the embodiment of the present disclosure, the attemperator is that high-frequency heating keeps the temperature coil；The casting mold heating device is heat
Type section heat type section high frequency coil, the heat type section high frequency coil are inside and outside double-layer coil structure.
It is illustrated in figure 3 expander structural schematic diagram, which includes expanding core print, core print mandril, copper alloy
The hydraulic delivery device of pipe, secondary heating mechanism, ring type cooling device and second temperature monitoring device；
Wherein, the expanding core print, it is expanding for being carried out to copper alloy tube after heating,
The core print mandril, for installing and fixing the expanding core print；
The hydraulic delivery device of copper alloy tube, the movement for pushing copper alloy tube to be expanded to generate；
The ring type cooling device is cooled down for the non-heated region to copper alloy tube, reduces temperature, guarantees copper alloy
Pipe intensity；
The secondary heating mechanism is quickly heated for treating expansion copper alloy tube, to realize that copper alloy tube is expanding
Operation；The secondary heating mechanism is heating coil.
The second temperature monitoring device guarantees copper alloy for the accurate control of the temperature to heating zone and cooling zone
The stabilization of blank temperature field.
The structure of the expander are as follows:
The expanding core print is horizontally set on the end of core print mandril one end, and the other end of the core print mandril is fixed on
Determine on frame；
The other end of the expanding core print, the expanding core print and the copper is arranged in the hydraulic delivery device of copper alloy tube
Cooling zone and heating zone are equipped between the hydraulic delivery device of alloy pipe stock, the cooling zone is positioned close to the copper alloy tube
Hydraulic delivery device side, the heating zone are positioned close to one end of the expanding core print, the secondary heating mechanism setting
In the heating zone, ring type cooling device setting is in the cooling zone, and the temperature control system is respectively with described the
Two heating devices and ring type cooling device control connection.
The expanding core print is from left to right followed successively by entrance, taper extension diameter section and sizing section, described sizing section one end with
The core print mandril is affixed, and the other end of the sizing section is affixed by one end of the taper extension diameter section and the entrance.
The diameter of the entrance is less than the diameter of the sizing section；The unilateral taper of the taper extension diameter section be 5~
20°。
The heating device is medium/high frequency heating coil.
Embodiment 1:
Having a size of φ 419 × 6mm BFe10-1.4-1 copper-nickel alloy (soft state) straight tube production method
Copper-nickel alloy pipe continuous vertical casting: prepare 360 × 15mm's of φ using the cold combination vertical mould continuous casting process of heat
BFe10-1.4-1 copper-nickel alloy pipe, 1250 DEG C of copper liquid fusion temperature, heat type (casting mold bringing-up section) temperature is 1200 DEG C, primary cooling
Water flow is 600L/min, and secondary cooling water flow is 600L/min, hauling speed 50mm/min；
Copper-nickel alloy pipe thermal expansion: the pipe of continuously casting is expanded to 480 × 11mm of φ, heating of pipe blank temperature using thermal expansion technique
It is 550 DEG C, extension diameter section angle is 10 °, and expanding speed is 200mm/min；
Periodic cold rolling: it is rolled using pipe of the three roller periodic cold rollings after expanding, one-pass roller to 419 × 6mm of φ
Specification；
By after periodic cold rolling pipe carry out finished product bright annealing, 780 DEG C of annealing temperature, annealing time 1h, Annealing Protection
Atmosphere 2%H2+ surplus N2, the finished product tubing of soft state is obtained, performance reaches requirement.
Embodiment 2:
Having a size of φ 325 × 4mm BFe10-1.4-1 copper-nickel alloy (soft state) straight tube production method
Copper-nickel alloy pipe continuous vertical casting: prepare 280 × 12mm's of φ using the cold combination vertical mould continuous casting process of heat
BFe10-1.4-1 copper-nickel alloy pipe, 1250 DEG C of copper liquid fusion temperature, heat type (casting mold bringing-up section) temperature is 1200 DEG C, primary cooling
Water flow is 400L/min, and secondary cooling water flow is 600L/min, hauling speed 60mm/min；
Copper-nickel alloy pipe thermal expansion: the pipe of continuously casting is expanded to 370 × 9mm of φ, heating of pipe blank temperature using thermal expansion technique
It is 550 DEG C, extension diameter section angle is 10 °, and expanding speed is 240mm/min；
Periodic cold rolling: rolling the pipe after expanding using three roller periodic cold rollings, and one-pass roller to φ 325 ×
4mm specification；
By after periodic cold rolling pipe carry out finished product bright annealing, 780 DEG C of annealing temperature, annealing time 1h, Annealing Protection
Atmosphere 2%H2+ surplus N2, the finished product tubing of soft state is obtained, performance reaches requirement.
Embodiment 3:
Having a size of φ 273 × 3mm BFe30-1-1 copper-nickel alloy (soft state) straight tube production method
Copper-nickel alloy pipe continuous vertical casting: prepare 240 × 12mm's of φ using the cold combination vertical mould continuous casting process of heat
BFe10-1.4-1 copper-nickel alloy pipe, 1300 DEG C of copper liquid fusion temperature, heat type (casting mold bringing-up section) temperature is 1250 DEG C, primary cooling
Water flow is 600L/min, and secondary cooling water flow is 600L/min, hauling speed 30mm/min；
Copper-nickel alloy pipe thermal expansion: the pipe of continuously casting is expanded to 320 × 9mm of φ, heating of pipe blank temperature using thermal expansion technique
It is 650 DEG C, extension diameter section angle is 6 °, and expanding speed is 180mm/min；
Periodic cold rolling: rolling the pipe after expanding using three roller periodic cold rollings, and one-pass roller to φ 273 ×
3mm specification；
By after periodic cold rolling pipe carry out finished product bright annealing, 850 DEG C of annealing temperature, annealing time 1h, Annealing Protection
Atmosphere 2%H2+ surplus N2, the finished product tubing of soft state is obtained, performance reaches requirement.
Advantages of the present invention has been shown and described above.It should be understood by those skilled in the art that the present invention is not by above-mentioned
The limitation of embodiment, the above embodiments and description only illustrate the principle of the present invention, is not departing from essence of the invention
Under the premise of mind and range, various changes and improvements may be made to the invention, these changes and improvements both fall within claimed
In invention scope.The scope of the present invention is defined by the appended claims and its equivalents.
Claims (7)
1. a kind of production method of major diameter White Copper Tubes, which is characterized in that this method is continuously cast using the cold combination vertical mould of heat
Make technique production surfaces externally and internally it is highly polished, evenness of wall thickness is high, dense structure, the copper-nickel alloy with axial orientation columanar structure
Hollow bloom, it is expanding to hollow bloom progress using thermal expansion technique, undergauge is carried out to thermal expansion pipe using periodic cold-rolling mill
Rolling, is prepared the major diameter White Copper Tubes of diameter > φ 300mm.
2. production method according to claim 1, which is characterized in that the production method specifically includes that steps are as follows:
S1: hollow using the cold combination vertical mould continuous metal cast process casting 100~450mm of outer diameter φ of heat, the copper-nickel alloy of 5~30mm of wall thickness
Pipe, the copper-nickel alloy hollow bloom be from top to bottom vertically continuously casting and go out, obtain with axial orientation column crystal
The copper-nickel alloy hollow bloom of tissue；
S2: it is expanding using the progress of thermal expansion technique that S1 is obtained into big specification copper-nickel alloy hollow bloom；
S3: undergauge rolling is carried out to the copper-nickel alloy hollow bloom after expanding in S2；
S4: the tubing that undergauge in S3 is rolled carries out finished product bright annealing, and realization regulates and controls the tissue and performance of tubing, full
Sufficient actual operation requirements.
3. production method according to claim 2, which is characterized in that the cold combination vertical continuous casting process of heat in the S1
Parameter are as follows: holding temperature is 1150~1300 DEG C, and time of repose is 30 minutes, 1000~1250 DEG C of heat type temperature, primary cold
But 5~800L/min of water flow, secondary cooling 5~1000L/min of water flow, 20~500mm/min of hauling speed.
4. production method according to claim 2, which is characterized in that the S2's specifically comprises the processes of:
Firstly, big specification copper-nickel alloy hollow bloom is mounted on the hydraulic delivery device of copper alloy tube, expanding core print is fixed,
It is spare；
Secondly, starting heating device by temperature control system, while starting the hydraulic push mechanism urges pipe of copper alloy tube
It is moved to expander core print direction, is heated by temperature control system starting annular cooling when the end of pipe enters heating zone
Device cools down the copper alloy tube in non-heated region, and hydraulic delivery device continues to press on copper alloy tube to expander
The movement of core print direction, enters expanding core print inside copper alloy tube, because the heating part of copper alloy tube is by expanding core
The extruding of the expanding mode of taper of head, copper alloy tube inner wall generate compression radially from inside to outside, make copper alloy tube
It is carried out according to preset ratio expanding.
5. production method according to claim 4, which is characterized in that the expanding technological parameter are as follows: heating temperature is
200~800 DEG C, the expanding unilateral taper of core head mould is 5~20 °, and expanding than being 1.1~1.4, expanding speed is 30~300mm/
min。
6. production method according to claim 2, which is characterized in that undergauge rolling is using two rollers or three rollers week in the S3
Phase formula cold-rolling mill is rolled, and rolling processing lengthening coefficient is 1.2~5.
7. production method according to claim 2, which is characterized in that annealing process in the S4 specifically: soft state product
700~900 DEG C of annealing temperature, annealing time is 0.5~2h；550~700 DEG C of half-hard state product annealing temperature, annealing time are
0.5~2h；Annealing Protection atmosphere is 1~3%H2, remaining as N2。
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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