CN109894590B - Continuous casting equipment and method for large-diameter copper alloy pipe - Google Patents
Continuous casting equipment and method for large-diameter copper alloy pipe Download PDFInfo
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- CN109894590B CN109894590B CN201910244924.9A CN201910244924A CN109894590B CN 109894590 B CN109894590 B CN 109894590B CN 201910244924 A CN201910244924 A CN 201910244924A CN 109894590 B CN109894590 B CN 109894590B
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Abstract
The invention belongs to the technical field of preparation and processing of metal materials, and particularly relates to continuous casting equipment and a continuous casting method for a large-diameter copper alloy pipe. The continuous casting apparatus includes: the device comprises a melting furnace, a transfer injection groove, an outer mold, a core rod, a liquid level monitoring device, a heat preservation device, a casting mold heating device, a temperature monitoring device, a water-cooling copper sleeve and a secondary cooling device. The invention provides a method for producing a large-diameter copper alloy pipe by adopting a hot-cold combined casting mold vertical continuous casting method, a strong temperature gradient along the axial direction is formed at the solidification front edge, the pipe has a columnar crystal structure along the axial direction, the upward floating and the removal of casting impurities are facilitated, the impurity content of the pipe is low, the wall thickness is uniform and good, the weight of a single pipe is large, the length of the single pipe is long, and the method has the advantages of high production efficiency, short process flow, high yield, low cost and the like.
Description
The technical field is as follows:
the invention belongs to the technical field of metal materials, and relates to a method for producing a large-diameter copper alloy pipe.
Background art:
the copper alloy has excellent mechanical property, good heat-conducting property, corrosion resistance and biological adhesion resistance, and is widely applied to the fields of thermal power generation, ships, seawater desalination and the like.
At present, the domestic large-diameter copper alloy pipe mainly adopts a process (called as 'extruding and drawing' process for short) of 'semi-continuous casting solid ingot casting, perforation extrusion, acid washing, expanding and drawing, intermediate annealing, reducing and drawing and annealing' (see: royal huaxing, etc., a manufacturing process method of a large-diameter copper alloy pipe, Chinese invention patent, grant number ZL200710054272. X; development and process research of products of Chenqin, Liu Guanlong, Li Juan and large-caliber copper alloy tubes, and production of Shanghai nonferrous metals, 2013, Vol34, No.2 and p.55-58. However, the "extrusion-diameter expansion-diameter reduction stretching" process has the following problems:
(1) the equipment investment is large, and a large extruder with the diameter of more than phi 300mm needs more than 5000 tons for producing the tube blank;
(2) the extruded tube blank is seriously eccentric, and the diameter is enlarged by expanding and stretching, so that the unevenness of the wall thickness of the tube can be further enlarged, and the product is easily scrapped;
(3) the single-pass deformation of expanding/reducing stretching is small, the number of processing passes is large, intermediate annealing is required, and the process flow is long;
(4) low comprehensive yield (less than 30 percent) and high production cost.
The horizontal continuous casting-drawing method is a recently proposed method for producing a large-diameter copper alloy pipe [ Jianyan bin, Liu Xin Hua, Xie Xin and Mao Xiao Dong ], which is a short-process production method of a large-diameter thin-wall copper alloy pipe, Chinese patent No. CN 105312353B ], the method prepares a hollow pipe blank with an axially-oriented columnar crystal structure by hot-cold combined horizontal continuous casting, and then draws the hollow pipe blank to produce the large-diameter copper alloy pipe. However, the method has certain defects and limitations in the preparation of tube blanks with large diameters, particularly larger than phi 300, and mainly shows that:
(1) because the horizontal continuous casting pipe is influenced by gravity, the upper and lower cooling degrees are different, the phenomenon of uneven solidification structure and components of the pipe blank is generated in the continuous casting process, the wall thickness deviation of the continuous casting pipe blank is increased, and the influence is more obvious when the diameter is larger;
(2) because the diameter of the continuous casting tube blank is determined to be always larger than that of the finished tube by adopting a horizontal continuous casting-drawing method, when the diameter of the finished tube is larger (more than 300mm), the difficulty of horizontally continuously casting the high-quality thin-wall copper alloy tube with the diameter of more than 300mm is larger.
The traditional vertical continuous casting is that an alloy melt sprue is directly injected into a crystallizer, a melt is not subjected to heat preservation and standing processes during solidification, gas and impurities in the melt do not float and are removed in time and space, on the other hand, the radial heat dissipation area of a pipe is increased along with the increase of the diameter of a copper alloy pipe, the radial heat transfer is enhanced, and particularly, the pipe with a large diameter of more than phi 200mm is more obvious.
Based on the background, the invention provides a method for producing a large-size copper alloy pipe by adopting a hot-cold combined casting mould vertical continuous casting process, overcomes the defects of horizontal continuous casting and vertical continuous casting, realizes the homogenization of the structure and components of the pipe, and realizes the production of the large-diameter, high-precision and high-quality copper alloy pipe.
The invention content is as follows:
the invention aims to provide equipment and a method for producing a large-diameter copper alloy pipe, which have the characteristics of high yield, low cost and the like, aiming at the problems of long process flow, low yield, high cost and the like of the traditional production process of the large-diameter copper alloy pipe.
In order to achieve the purpose, the technical scheme of the invention is as follows: a vertical continuous casting apparatus for a large-diameter copper alloy pipe, the continuous casting apparatus comprising:
-a melting furnace for melting a copper alloy raw material;
-a transfer tank for conducting a flow of molten copper alloy;
-an outer mould for storing a copper alloy melt;
-a mandrel placed inside the outer die, leaving a gap between the outer sidewall of the mandrel and the inner sidewall of the outer die for co-over-molding a large diameter copper alloy;
-a liquid level monitoring device for monitoring the liquid level change of the copper alloy melt in the outer die in real time;
-a holding device for holding the copper alloy melt in the outer mold;
a casting mold heating device arranged at the lower end of the heat preservation device and used for heating a casting mold of the copper alloy melt entering the gap between the outer mold and the core rod;
-temperature monitoring means for monitoring in real time the temperature change of the mould heating;
-a water-cooled copper jacket for primary cooling of the formed large-diameter alloy tube;
and the secondary cooling device is used for carrying out secondary cooling on the formed large-diameter alloy pipe.
According to the embodiment of the disclosure, a liquid outlet hole is formed in the center of the bottom surface inside the melting furnace, and a stopper rod flow control structure is arranged on the liquid outlet hole;
the liquid outlet hole is communicated with one end of a horizontal liquid outlet flow channel arranged in the bottom of the melting furnace, the other end of the horizontal liquid outlet flow channel is communicated with one end of the transfer groove, and the other end of the transfer groove is arranged in the outer mold;
the outer mold is sequentially divided into a heat preservation section, a casting mold heating section and a cooling section from top to bottom, the heat preservation device is arranged on the outer side wall of the heat preservation section, the casting mold heating device is arranged on the outer side wall of the casting mold heating section, and the water-cooling copper sleeve is arranged on the outer side wall of the cooling section; the secondary cooling device is arranged below the water-cooling copper sleeve;
the liquid level monitoring device is arranged on the side wall of the outer die and is in control connection with the stopper rod flow control structure, and a probe of the liquid level monitoring device is arranged inside the outer die;
the temperature monitoring device is arranged at the casting mold heating section of the outer mold;
the core rod is arranged in the outer die and is positioned in the heating section and the cooling section of the casting mold;
the dummy bar head is arranged at an outlet at the bottom of the outer die and is connected with a dummy bar, and two sides of the dummy bar are provided with tractors; the sawing machine is arranged at the lower end of the dummy bar.
According to the embodiment of the disclosure, the continuous casting equipment for the large-diameter copper alloy pipe further comprises a heat insulation layer, wherein the heat insulation layer is coated on the outer side wall of the outer die of the heat insulation section and the outer side wall of the outer die of the casting mold heating section, the heat insulation layer is formed by pouring refractory materials, and the outer die and the core rod are both made of graphite; the length of the casting mold heating section is 30-100 mm.
According to the embodiment of the disclosure, the ratio of the height of the water-cooling copper sleeve to the diameter of the formed large-diameter alloy pipe is 0.5-0.8.
According to the embodiment of the disclosure, the heat preservation device is a high-frequency heating heat preservation coil; the casting mold heating device is a hot section high-frequency coil, and the hot section high-frequency coil is of an inner-outer double-layer coil structure.
The embodiment of the disclosure also discloses a continuous casting method for preparing the large-diameter copper alloy pipe by using the equipment, which specifically comprises the following steps:
step 1: mounting each part on a casting platform in place, and communicating primary cooling water of the water-cooling copper sleeve;
step 2: starting a heat preservation device to preheat the heat preservation section of the outer mold;
then, melting the copper alloy in the melting furnace to obtain a copper alloy solution, opening a stopper rod flow control structure, inputting the copper alloy melt into the outer membrane through a transfer tank, enabling the copper alloy melt to be located in a heat preservation section, monitoring the liquid level height of the copper alloy through a liquid level control system, placing graphite flakes or a covering agent on the liquid level of the copper alloy melt to prevent oxidation, and standing for a period of time;
and step 3: starting a casting mold heating device, and continuously heating a casting mold heating section of an outer mold to keep the temperature at a certain temperature;
and 4, step 4: the heated copper alloy solution enters a gap between an outer mold and a core rod of a cooling section under the action of gravity, so that the solid-liquid interface position is in a transition zone of a hot section and a cold section, a large-diameter alloy pipe blank is obtained by casting under the cooling of a water-cooled copper sleeve, a secondary cooling water device is opened, the large-diameter alloy pipe blank obtained by casting is subjected to secondary cooling, a traction mechanism is started, and the casting is pulled at a certain initial traction speed to obtain the large-diameter alloy pipe blank;
and 5: and (5) carrying out fixed-length sawing through a sawing machine to obtain the large-diameter copper alloy pipe.
According to the embodiment of the disclosure, the flow rate of the primary cooling water in the step 1 is 5-100L/h.
According to an embodiment of the present disclosure, in step 2: the liquid level height of the melting furnace is 350-450 mm; the preheating temperature of the outer die is 800-1200 ℃; the temperature of the molten copper alloy transferred into the outer die is 100-200 ℃ above the liquidus line of the copper alloy, and the heat preservation temperature is 50-150 ℃ above the liquidus line of the copper alloy; the standing time is 10-30 minutes.
According to the embodiment of the disclosure, the temperature for heating the casting mold in the step 3 is 50-150 ℃ above the liquidus line of the copper alloy.
According to the embodiment of the disclosure, in the step 4, the initial traction speed is 20-60 mm/min, the stable production speed is 50-600 mm/min, and the secondary cooling water flow is 10-100L/min.
The invention has the beneficial effects that:
(1) the large-diameter copper pipe vertical continuous casting equipment provided by the invention can realize the rapid production of large-size (more than phi 300mm) copper alloy pipes, and has the advantages of convenient installation, simple use, easy operation, low cost and the like;
(2) along with the increase of the diameter of the copper alloy pipe, the radial heat dissipation area of the pipe is increased, the radial heat transfer is enhanced, and particularly, the large-diameter pipe with the diameter larger than phi 200mm is more obvious.
(3) The traditional vertical continuous casting is that an alloy melt sprue is directly injected into a crystallizer, a melt is not subjected to heat preservation and standing processes during solidification, gas and impurities in the melt do not float and are removed in time and space, and alloy cast ingots are easy to generate defects.
(4) The hot and cold combined vertical continuous casting process provided by the invention has the advantages that a high-temperature gradient is formed at the front edge of a solidification interface, a nearly horizontal solid-liquid interface is formed, floating and removal of gas and impurity elements in a melt are facilitated, and the prepared copper alloy tube blank is compact in structure and uniform in components. The casting blank is influenced by the same gravity in the axial direction, the cooling strength is the same, the solidification structure is uniform, the wall thickness deviation of the tube blank is small, and the high-quality large-diameter copper alloy continuous casting tube blank can be prepared.
Description of the drawings:
FIG. 1 is a schematic view of a vertical continuous casting apparatus for a large-diameter copper alloy pipe according to the present invention.
In the figure:
1. the casting mold comprises a melting furnace, 2 parts of a transfer tank, 3 parts of a liquid level monitoring device, 4 parts of an outer mold, 5 parts of a heat preservation device, 6 parts of a core rod, 7 parts of a casting mold heating device, 8 parts of a temperature monitoring device, 9 parts of a water-cooled copper sleeve, 10 parts of a secondary cooling device, 11 parts of a dummy bar head, 12 parts of a traction machine, 13 parts of a dummy bar and 14 parts of a sawing machine.
Detailed Description
The technical solution of the present invention will be described in detail with reference to an example, and it is obvious that the described example is only a small part of the present invention, but not all examples. All other examples, which can be obtained by a person skilled in the art without making any inventive step, based on the examples of the present invention, fall within the scope of protection of the present invention.
As shown in fig. 1, the present invention is a vertical continuous casting apparatus for a large-diameter copper alloy pipe, the continuous casting apparatus comprising:
-a melting furnace for melting a copper alloy raw material;
-a transfer tank for conducting a flow of molten copper alloy;
-an outer mould for storing a copper alloy melt;
-a mandrel placed inside the outer die, leaving a gap between the outer sidewall of the mandrel and the inner sidewall of the outer die for co-over-molding a large diameter copper alloy;
-a liquid level monitoring device for monitoring the liquid level change of the copper alloy melt in the outer die in real time;
-a holding device for holding the copper alloy melt in the outer mold;
a casting mold heating device arranged at the lower end of the heat preservation device and used for heating a casting mold of the copper alloy melt entering the gap between the outer mold and the core rod;
-temperature monitoring means for monitoring in real time the temperature change of the mould heating;
-a water-cooled copper jacket for primary cooling of the formed large-diameter alloy tube;
the secondary cooling device is used for carrying out secondary cooling on the formed large-diameter alloy pipe;
according to the embodiment of the disclosure, a liquid outlet hole is formed in the center of the bottom surface inside the melting furnace, and a stopper rod flow control structure is arranged on the liquid outlet hole;
the liquid outlet hole is communicated with one end of a horizontal liquid outlet flow channel arranged in the bottom of the melting furnace, the other end of the horizontal liquid outlet flow channel is communicated with one end of the transfer groove, and the other end of the transfer groove is arranged in the outer mold;
the outer mold is sequentially divided into a heat preservation section, a casting mold heating section and a cooling section from top to bottom, the heat preservation device is arranged on the outer side wall of the heat preservation section, the casting mold heating device is arranged on the outer side wall of the casting mold heating section, and the water-cooling copper sleeve is arranged on the outer side wall of the cooling section; the secondary cooling device is arranged below the water-cooling copper sleeve;
the liquid level monitoring device is arranged on the side wall of the outer die and is in control connection with the stopper rod flow control structure, and a probe of the liquid level monitoring device is arranged inside the outer die;
the temperature monitoring device is arranged at the casting mold heating section of the outer mold;
the core rod is arranged in the outer die and is positioned in the heating section and the cooling section of the casting mold;
the dummy bar head is arranged at an outlet at the bottom of the outer die and is connected with a dummy bar, and two sides of the dummy bar are provided with tractors; the sawing machine is arranged at the lower end of the dummy bar.
According to the embodiment of the disclosure, the continuous casting equipment for the large-diameter copper alloy pipe further comprises a heat insulation layer, wherein the heat insulation layer is coated on the outer side wall of the outer die of the heat insulation section and the outer side wall of the outer die of the casting mold heating section, the heat insulation layer is formed by pouring refractory materials, and the outer die and the core rod are both made of graphite; the length of the casting mold heating section is 30-100 mm; the length of the cold section is 50-150 mm.
According to the embodiment of the disclosure, the ratio of the height of the water-cooling copper sleeve to the diameter of the formed large-diameter alloy pipe is 0.5-0.8.
According to the embodiment of the disclosure, the heat preservation device is a high-frequency heating heat preservation coil; the casting mold heating device is a hot section high-frequency coil which is of an inner-outer double-layer coil structure.
The embodiment of the disclosure also discloses a continuous casting method for preparing the large-diameter copper alloy pipe by using the equipment, which specifically comprises the following steps:
step 1: mounting each part on a casting platform in place, and communicating primary cooling water of the water-cooling copper sleeve;
step 2: starting a heat preservation device to preheat the heat preservation section of the outer mold;
then, melting the copper alloy in the melting furnace to obtain a copper alloy solution, opening a stopper rod flow control structure, inputting the copper alloy melt into the outer membrane through a transfer tank, enabling the copper alloy melt to be located in a heat preservation section, monitoring the liquid level height of the copper alloy through a liquid level control system, placing graphite flakes or a covering agent on the liquid level of the copper alloy melt to prevent oxidation, and standing for a period of time;
and step 3: starting a casting mold heating device, and continuously heating a casting mold heating section of an outer mold to keep the temperature at a certain temperature;
and 4, step 4: the heated copper alloy solution enters a gap between an outer mold and a core rod of a cooling section under the action of gravity, so that the solid-liquid interface position is in a transition zone of a hot section and a cold section, a large-diameter alloy pipe blank is obtained by casting under the cooling of a water-cooled copper sleeve, a secondary cooling water device is opened, the large-diameter alloy pipe blank obtained by casting is subjected to secondary cooling, a traction mechanism is started, and the casting is pulled at a certain initial traction speed to obtain the large-diameter alloy pipe blank;
and 5: and (5) carrying out fixed-length sawing through a sawing machine to obtain the large-diameter copper alloy pipe.
According to the embodiment of the disclosure, the flow rate of the primary cooling water in the step 1 is 5-100L/h.
According to an embodiment of the present disclosure, in step 2: the liquid level height of the melting furnace is 350-450 mm; the preheating temperature of the outer die is 800-1200 ℃; the temperature of the molten copper alloy transferred into the outer die is 100-200 ℃ above the liquidus line of the copper alloy, and the heat preservation temperature is 50-150 ℃ above the liquidus line of the copper alloy; the standing time is 10-30 minutes.
According to the embodiment of the disclosure, the temperature for heating the casting mold in the step 3 is 50-150 ℃ above the liquidus line of the copper alloy.
According to the embodiment of the disclosure, in the step 4, the initial traction speed is 20-60 mm/min, the stable production speed is 50-600 mm/min, and the secondary cooling water flow is 10-100L/min.
Example 1:
BFe10-1.4-1 copper alloy pipe continuous casting process with phi 325 x 10mm size
Step 1: the hot-cold combined vertical continuous casting equipment is installed in place, the inner diameter of the graphite outer mold 4 is phi 330mm, and the primary cooling water flow is 10L/min;
step 2: heating the heat preservation section of the graphite outer mold to 1000 ℃, transferring to BFe10-1.4-1 copper alloy melt, heating the graphite mold and the copper alloy melt to 1200 ℃ by a high-frequency heating heat preservation coil, preserving heat and standing for 30 minutes;
and step 3: a hot heating coil heats the steel plate to 1200 ℃;
and 4, step 4: and starting a continuous casting traction system, and starting secondary cooling water, wherein the initial traction speed is 30mm/min, the secondary water flow is 10L/min, the positive production speed is 100mm/min, the primary water flow is 30L/min, and the secondary water flow is 40L/min.
Example 2:
continuous casting method of H68 copper alloy pipe with dimension of phi 273 x 8mm
Step 1: the hot-cold combined vertical continuous casting equipment is installed in place, the inner diameter of the graphite outer mold 4 is phi 280mm, and the primary cooling water flow is 8L/min;
step 2: heating the heat preservation section of the graphite outer mold to 800 ℃, transferring the graphite outer mold to H68 copper alloy melt, heating the graphite mold and the copper alloy melt to 1050 ℃ by a high-frequency heating heat preservation coil, preserving heat and standing for 30 minutes;
and step 3: heating the hot type heating coil to 1000 ℃;
and 4, step 4: and starting a continuous casting traction system, and starting secondary cooling water, wherein the initial traction speed is 30mm/min, the secondary water flow is 10L/min, the positive production speed is 150mm/min, the primary water flow is 30L/min, and the secondary water flow is 40L/min.
Example 3:
continuous casting production method of phi 259 x 6mm BFe30-1-1 copper alloy pipe
Step 1: the hot-cold combined vertical continuous casting equipment is installed in place, the inner diameter of the graphite outer mold 4 is phi 262mm, and the flow rate of primary cooling water is 15L/min;
step 2: heating the heat preservation section of the graphite outer mold to 1000 ℃, transferring to BFe30-1-1 copper alloy melt, heating the graphite mold and the copper alloy melt to 1250 ℃ by a high-frequency heating heat preservation coil, preserving heat and standing for 30 minutes;
and step 3: the heating temperature of the hot heating coil is 1250 ℃;
and 4, step 4: and starting a continuous casting traction system, and starting secondary cooling water, wherein the initial traction speed is 20mm/min, the secondary water flow is 15L/min, the positive production speed is 60mm/min, the primary water flow is 40L/min, and the secondary water flow is 40L/min.
The advantages of the invention have been shown and described. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. The utility model provides a continuous casting equipment of major diameter copper alloy pipe, continuous casting equipment be applicable to the preparation diameter and be more than 300mm super large-diameter copper alloy tubular product, continuous casting equipment includes:
-a melting furnace for melting a copper alloy raw material;
-a transfer tank for conducting a flow of molten copper alloy;
-an outer mould for storing a copper alloy melt;
-a mandrel arranged inside the outer die for cooperating with the outer die for forming the large-diameter copper alloy tube, a gap being left between an outer side wall of the mandrel and an inner side wall of the outer die;
-a liquid level monitoring device for monitoring the liquid level change of the copper alloy melt in the outer die in real time;
-a holding device for holding the copper alloy melt in the outer mold;
a mold heating device arranged at the lower end of the heat preservation device and used for heating a mold formed by the gap between the outer mold and the core rod and the copper alloy melt entering the mold;
-temperature monitoring means for monitoring in real time the temperature change of the mould heating;
-a water-cooled copper jacket for primary cooling of the formed large-diameter copper alloy tube;
-secondary cooling means for secondary cooling of the formed large-diameter copper alloy pipe;
a liquid outlet hole is formed in the center of the bottom surface inside the melting furnace, and a stopper rod flow control structure is arranged on the liquid outlet hole;
the liquid outlet hole is communicated with one end of a horizontal liquid outlet flow channel arranged in the bottom of the melting furnace, the other end of the horizontal liquid outlet flow channel is communicated with one end of the transfer groove, and the other end of the transfer groove is arranged in the outer mold;
the outer mold is sequentially divided into a heat preservation section, a casting mold heating section and a cooling section from top to bottom, the heat preservation device is arranged on the outer side wall of the heat preservation section, the casting mold heating device is arranged on the outer side wall of the casting mold heating section, and the water-cooling copper sleeve is arranged on the outer side wall of the cooling section;
the secondary cooling device is arranged below the water-cooling copper sleeve;
the continuous casting equipment for the large-diameter copper alloy pipe further comprises a heat insulation layer, wherein the heat insulation layer is coated on the outer side walls of the heat insulation section of the outer die and the casting heating section, and the heat insulation layer is formed by pouring refractory materials;
the outer die and the core rod are both made of graphite;
the length of the casting mold heating section is 30-100 mm;
the ratio of the height of the water-cooling copper sleeve to the diameter of the formed large-diameter copper alloy pipe is 0.5-0.8;
the heat preservation device is a high-frequency heating heat preservation coil; the casting mold heating device is a hot section high-frequency coil which is of an inner-outer double-layer coil structure;
the liquid level monitoring device is arranged on the side wall of the outer die and connected with the stopper rod flow control structure, and a probe of the liquid level monitoring device is arranged inside the outer die;
the temperature monitoring device is arranged at the casting mold heating section of the outer mold;
the core rod is arranged in the outer die and is positioned in the heating section and the cooling section of the casting mold;
an outlet at the bottom of the outer mold is provided with a dummy bar head, the dummy bar head is connected with a dummy bar, and two sides of the dummy bar are provided with tractors; the sawing machine is arranged below the tractor.
2. A continuous casting method for producing a large-diameter copper alloy pipe using the apparatus according to claim 1, characterized by comprising the steps of:
step 1: mounting each part on a casting platform in place, and communicating primary cooling water of the water-cooling copper sleeve;
step 2: starting a heat preservation device to preheat the heat preservation section of the outer mold;
melting the copper alloy in the melting furnace to obtain a copper alloy melt, opening the stopper rod flow control structure to enable the copper alloy melt to be input into the outer mold through the transfer tank, enabling the copper alloy melt to be located in the heat preservation section, monitoring the liquid level height of the copper alloy through a liquid level control system, placing a covering agent on the liquid level of the copper alloy melt to prevent oxidation, and standing for a period of time;
and step 3: starting a casting heating device, and continuously heating a casting heating section of the outer mold to ensure that the casting heating section reaches a certain temperature and keeps stable;
and 4, step 4: the heated copper alloy melt enters a gap between an outer mold and a core rod of the cooling section under the action of gravity, a large-diameter alloy pipe blank is obtained under the cooling of a water-cooling copper sleeve, and the solid-liquid interface position is in a transition region of a hot section and a cold section; starting a traction mechanism, and drawing the solidified and formed large-diameter alloy pipe blank at a certain initial traction speed; opening a secondary cooling water device to carry out secondary cooling on the large-diameter alloy pipe blank;
and 5: carrying out fixed-length sawing through a sawing machine to obtain a large-diameter copper alloy pipe;
in the step 1: the primary cooling water flow is 5-100L/h;
in the step 2: the liquid level height of the melting furnace is 350-450 mm; the preheating temperature of the outer die is 800-1200 ℃; the temperature of the molten copper alloy transferred into the outer die is 100-200 ℃ above the liquidus line of the copper alloy, and the heat preservation temperature is 50-150 ℃ above the liquidus line of the copper alloy; standing for 10-30 minutes;
in the step 3: the temperature for heating the casting mold is 50-150 ℃ above the liquidus line of the copper alloy;
in the step 4: the initial traction speed is 20-60 mm/min, and the secondary cooling water flow is 10-100L/min.
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| CN112605352B (en) * | 2020-10-27 | 2022-07-01 | 佛山市三水凤铝铝业有限公司 | Casting method of aluminum alloy cast rod |
| CN113333708A (en) * | 2021-05-27 | 2021-09-03 | 宁波金田铜业(集团)股份有限公司 | Control method for generating axial columnar crystal by copper and copper alloy and obtained copper and copper alloy |
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