CN113684385B - Method for manufacturing rare earth modified high-strength corrosion-resistant 5-series ship aluminum alloy - Google Patents

Method for manufacturing rare earth modified high-strength corrosion-resistant 5-series ship aluminum alloy Download PDF

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CN113684385B
CN113684385B CN202110892006.4A CN202110892006A CN113684385B CN 113684385 B CN113684385 B CN 113684385B CN 202110892006 A CN202110892006 A CN 202110892006A CN 113684385 B CN113684385 B CN 113684385B
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fixedly connected
casting
aluminum
plate
rare earth
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CN113684385A (en
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黄祯荣
冯永平
池海涛
侯宇晖
刘金霞
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Fujian Xiangxin New Material Technology Co ltd
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Fujian Xiangxin New Material Technology Co ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/03—Making non-ferrous alloys by melting using master alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D29/00—Removing castings from moulds, not restricted to casting processes covered by a single main group; Removing cores; Handling ingots
    • B22D29/04—Handling or stripping castings or ingots
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D30/00—Cooling castings, not restricted to casting processes covered by a single main group
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D35/00—Equipment for conveying molten metal into beds or moulds
    • B22D35/04—Equipment for conveying molten metal into beds or moulds into moulds, e.g. base plates, runners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/001—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like devices for cleaning ladles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D5/00—Machines or plants for pig or like casting
    • B22D5/04—Machines or plants for pig or like casting with endless casting conveyors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00—Casting ingots, e.g. from ferrous metals
    • B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D9/00—Machines or plants for casting ingots
    • B22D9/003—Machines or plants for casting ingots for top casting
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/026—Alloys based on aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
    • C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent

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  • Crystallography & Structural Chemistry (AREA)
  • Continuous Casting (AREA)

Abstract

The invention discloses a method for manufacturing a rare earth modified high-strength corrosion-resistant 5-series ship aluminum alloy, which relates to the field of aluminum alloy section bar manufacturing, and comprises the following raw materials in percentage by mass: si is less than or equal to 0.4 percent, Fe is less than or equal to 0.4 percent, Cu is less than or equal to 0.35 percent, Mn: 0.6-1.1%, Mg: 4.0-5.5%, Cr is less than or equal to 0.4%, Zn is less than or equal to 0.55%, Ti is less than or equal to 0.15%, Zr:0.1 to 0.25 percent; simultaneously adding rare earth elements Sc: 0.1-0.5 percent of Zr and less than or equal to 0.2 percent of Zr; the balance of Al; the rare earth modified 5-series alloy has the tensile strength of over 330MPa, the yield strength of over 210MPa and the elongation of 13 percent; the rare earth modified 5-series alloy has the advantages that the exfoliation corrosion result reaches EA level and above, and the alloy has excellent stress corrosion resistance; the rare earth modified 5-series alloy can be applied to ship production, ensures that a casting pipe is in a clean state, avoids the influence of impurities on the descending speed of aluminum liquid, and is beneficial to practical use.

Description

Method for manufacturing rare earth modified high-strength corrosion-resistant 5-series ship aluminum alloy
Technical Field
The invention relates to the field of aluminum alloy section bar manufacturing, in particular to a method for manufacturing rare earth modified high-strength corrosion-resistant 5-series ship aluminum alloy.
Background
The aluminum alloy has characteristics such as proportion and elastic modulus are little, corrosion-resistant, workable, non-magnetism nature and low temperature nature, and along with the development of boats and ships trade, the lightweight receives more and more attention, and green and high-tech boats and ships are advocated to the country moreover, therefore the aluminum alloy structure is replacing traditional steel construction gradually, and the aluminum alloy is more and more used for shipbuilding.
The corrosion resistance of the existing ship aluminum alloy can not meet the requirements of the prior art, and meanwhile, impurities are easily remained in a casting pipe during continuous casting of aluminum alloy sections, and the falling speed of aluminum liquid is influenced after the impurities are accumulated, so that the aluminum alloy is not beneficial to practical use.
The invention provides a corrosion-resistant 7-series aluminum alloy which can be quenched on line and has the strength of 500 MPa.
Disclosure of Invention
The invention aims to provide a method for manufacturing a rare earth modified high-strength corrosion-resistant 5-series marine aluminum alloy, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for manufacturing a rare earth modified high-strength corrosion-resistant 5-series ship aluminum alloy comprises the following specific steps:
1) smelting treatment: smelting aluminum alloy according to the mass fraction: sequentially adding an aluminum ingot, an aluminum-copper intermediate alloy, an aluminum-manganese intermediate alloy, an aluminum-chromium intermediate alloy, an aluminum-zirconium intermediate alloy, an aluminum-scandium intermediate alloy, a zinc ingot and the like into a crucible, then adding the crucible into a smelting furnace for smelting, simultaneously adding a slag cleaning agent for removing slag after the ingredients are completely melted, performing electromagnetic stirring for more than 2 times, adding a magnesium ingot into the melt when the temperature of the melt reaches 730-;
2) furnace guiding and refining: introducing the melt obtained in the step 1) into a standing furnace through a furnace guide groove, introducing a No. 2 refining agent into the melt by using argon gas for refining, and then slagging off;
3) heating and standing: controlling the temperature of the melt obtained in the step 2) at 745-775 ℃, and standing for 30 min;
4) casting: adding the melt obtained in the step 3) into a casting machine for casting, adding a proper amount of Al-Ti-B wires on line during casting, controlling the casting speed at 60-90mm/min and controlling the cooling water flow at 50-90L/min;
5) ingot casting homogenization: adding the ingot obtained in the step 4) into a homogenizing box for homogenizing treatment, keeping the temperature for 24h at the homogenizing temperature of 460-475 ℃, and then discharging from the furnace for air cooling;
6) removing a segregation layer from the cast ingot: adding the ingot obtained in the step 5) into a peripheral segregation layer removing box to remove the turning for 2-4mm, and removing the peripheral segregation layer of the ingot;
7) profile extrusion: heating the ingot obtained in the step 6) to 440-460 ℃, and adding the ingot into a forming machine for extrusion production by adopting natural cooling to room temperature, wherein the speed of the section bar is 0.6-1.5 m/min;
8) stretching the section bar: and (3) stretching the section bar obtained in the step 7), wherein the stretching rate of the section bar with the length of 6-10m is 1-3%.
Furthermore, the rare earth modified high-strength corrosion-resistant 5-series ship aluminum alloy comprises the following raw materials in percentage by mass: si is less than or equal to 0.4 percent, Fe is less than or equal to 0.4 percent, Cu is less than or equal to 0.35 percent, Mn: 0.6-1.1%, Mg: 4.0-5.5%, Cr is less than or equal to 0.4%, Zn is less than or equal to 0.55%, Ti is less than or equal to 0.15%, Zr:0.1 to 0.25 percent; simultaneously adding rare earth elements Sc: 0.1-0.5 percent of Zr and less than or equal to 0.2 percent of Zr; the balance being Al.
The manufacturing device of the rare earth modified high-strength corrosion-resistant 5-series ship aluminum alloy comprises a crucible, a smelting furnace, a standing furnace, a casting machine, a homogenizing box, a peripheral segregation layer removing box and a forming machine, wherein the crucible is arranged in the smelting furnace, two sides of the middle upper end of the standing furnace are respectively and fixedly connected with an air inlet pipe and an air outlet pipe, and the bottom of the air inlet pipe is fixedly connected with a casting pipe; the static furnace adds molten aluminum into a casting machine through a casting pipe for forming, the aluminum ingot formed in the casting machine is conveyed into a homogenizing box for homogenizing treatment, the aluminum ingot in the homogenizing box is added into a peripheral segregation layer removing box through an external conveying structure for removing a peripheral segregation layer of the ingot, and the aluminum ingot from which the peripheral segregation layer of the ingot is removed is added into the forming machine through the external conveying structure for extrusion forming;
the casting machine comprises a first support frame, the first support frame is connected with an even casting structure for even casting, the even casting structure comprises a first support plate, an aluminum water receiving cavity, a casting mold, a first driving roller, a driving wheel, a speed reducing motor, a driving belt, a cross rod, a straight rod, an inner ring, a stirring block, an outer ring, a second support plate and a casting pipe, the inner wall of the first support frame is evenly and fixedly connected with the first driving roller through an even and fixedly connected bearing, the outer wall of the first driving roller is movably connected with the driving wheel, the driving wheel is in limit and movable connection with the driving belt, the outer wall of the driving belt is evenly and fixedly connected with the casting mold, the right end of the first support frame is respectively and fixedly connected with the first support plate and the second support plate, the first support plate is rotatably connected with the cross rod through the fixedly connected bearing, the cross rod is fixedly connected with the aluminum water receiving cavity, the second supporting plate is rotatably connected with the aluminum water receiving cavity through a bearing fixedly connected with the second supporting plate, the lowest end of the aluminum water receiving cavity is uniformly and fixedly connected with a casting pipe along the circumferential direction, the outer wall of the aluminum water receiving cavity is fixedly connected with an inner ring, the outer wall of the inner ring is uniformly and fixedly connected with a straight rod, the outer end of the straight rod is fixedly connected with an outer ring, the outer wall of the outer ring is uniformly and fixedly connected with a stirring block along the circumferential direction, the mounting positions of the stirring blocks and the mounting positions of the casting pipes are arranged in a one-to-one correspondence mode, and one group of first driving rollers are fixedly connected with the output end of the speed reducing motor;
the slag removing structure comprises a mounting frame, a U-shaped guide chute, a first electric push rod, a connecting straight rod, a semicircular scraper blade, a second electric push rod, a mounting groove, a sliding groove, a push plate, a lug, an L-shaped driving block, a rotating pin shaft and a hinge, the U-shaped guide chute is fixedly connected to the top of the first support plate, the mounting frame is fixedly connected to the U-shaped guide chute, the connecting straight rod is fixedly connected to the output end of the first electric push rod, the mounting groove is formed in the bottom of the connecting straight rod, the connecting straight rod is symmetrically provided with the sliding groove at the lower end of the mounting groove, the second electric push rod is fixedly connected to the inner top of the mounting groove, the push plate is fixedly connected to the output end of the second electric push rod, and the push plate is in fit sliding connection with the sliding groove, the two ends of the push plate are fixedly connected with L-shaped driving blocks, the second supporting plate is rotatably connected with a rotating pin shaft, the rotating pin shaft is fixedly connected with a protruding block, the protruding block is fixedly connected with a semicircular scraper, the semicircular scraper is fixedly connected with a hinge, the hinge is fixedly arranged at the bottom of the connecting straight rod, the semicircular scrapers rotate to be mutually attached when the output end of the second electric push rod extends, and the semicircular scrapers rotate to be unfolded and are attached to the inner wall of the casting pipe in a sliding mode when the output end of the second electric push rod is retracted;
the middle end of the first support frame is provided with a cooling structure, the cooling structure comprises a spray pipe, a straight plate, a water inlet pipe, a sliding hole, a water sheet pipe and a water receiving tank, the first support frame of one group is provided with the sliding hole, the sliding hole is internally connected with the water receiving tank in a fit sliding manner, the bottom of the outer end of the water receiving tank is fixedly connected with the water sheet pipe, the top of the first support frame of the other group is fixedly connected with the straight plate, the straight plate is uniformly and fixedly connected with the spray pipe, the spray pipe is fixedly connected with the water inlet pipe, and the water inlet pipe is connected with an external power water source;
the left end of the first support frame is provided with a beating structure, the beating structure comprises a beating plate, a spring, a U-shaped straight plate, an L-shaped sliding plate and a cam, the bottom of the U-shaped straight plate is fixedly connected with the spring, the bottom of the spring is fixedly connected with the beating plate, the top of the beating plate is fixedly connected with the L-shaped sliding plate, the cam is fixedly arranged on the first driving roller at the leftmost end, and the top of the cam is in contact with the bottom of the transverse part of the L-shaped sliding plate in a fitting manner;
the left lower extreme of first support frame is connected with the blanking structure who is used for the unloading, blanking structure includes conveyer belt, second support frame, belt, first belt pulley, second belt pulley and second drive roller, the second support frame passes through the even fixedly connected with second drive roller of fixed connection's bearing, the outer wall swing joint of second drive roller has the conveyer belt, and wherein a set of the first belt pulley of conveyer belt fixedly connected with, first belt pulley swing joint has the belt, belt swing joint has the second belt pulley.
Furthermore, the crucible is also provided with an electromagnetic stirring structure.
Furthermore, the speed reducing motor is fixedly arranged on the outer wall of the first support frame.
Furthermore, the liquid outlet end of the casting pipe is arranged in the aluminum water receiving cavity.
Furthermore, when the casting pipes are poured, the uppermost casting pipe is moved to a position right above the U-shaped guide chute, and the output end of the mounting frame is over against the uppermost casting pipe.
Furthermore, the upright part of the L-shaped sliding plate is connected with a sliding hole arranged on the U-shaped straight plate in a sliding way.
Furthermore, two ends of the U-shaped straight plate are uniformly and fixedly connected with the inner wall of the first support frame.
Further, the second belt pulley is fixedly connected with the first driving roller of one group.
The invention has the beneficial effects that:
when the casting pipe rotates to the lowest end for casting, the uppermost casting pipe moves to be right above a U-shaped guide chute of a slag removing structure, the telescopic end of a second electric push rod extends, the second electric push rod drives a push plate to move, the push plate drives an L-shaped driving block to move, a second supporting plate pushes a semicircular scraper blade to rotate along the second supporting plate, the semicircular scraper blades rotate to be mutually attached, then when the output end of the second electric push rod is retracted, the semicircular scraper blade rotates and unfolds to be attached to the inner wall of the casting pipe, the first electric push rod drives a connecting straight rod to move, the first electric push rod drives the semicircular scraper blade to move, and the semicircular scraper blade slides in the casting pipe to scrape impurities bonded on the casting pipe, so that the casting pipe is ensured to be in a clean state, the impurities are prevented from influencing the descending speed of molten aluminum, and the molten aluminum liquid is favorable for practical use;
according to the invention, the first driving roller rotates to drive the cam of the beating structure to rotate, the protruding part of the cam intermittently contacts with the L-shaped sliding plate, the cam pushes the L-shaped sliding plate to move upwards, the spring drives the beating plate to move downwards after the cam is separated from the L-shaped sliding plate, and the beating plate realizes intermittent beating on the casting die, so that an aluminum ingot formed in the casting die is conveniently discharged;
according to the aluminum ingot discharging device, the first driving roller drives the second belt pulley of the discharging structure to rotate, the second belt pulley drives the first belt pulley to rotate through the belt, the first belt pulley drives the second belt pulley to rotate, and the second belt pulley drives the conveying belt to rotate, so that discharged aluminum ingots can be conveniently conveyed to the next station to be continuously processed;
according to the invention, the electromagnet of the shaking prevention structure is powered off when the crucible moves, the restoring force of the spring pushes the sliding iron block to move, the sliding iron block pushes the sliding rod to move, the sliding rod drives the braking plate to be in contact with the n-shaped connecting plate in a laminating manner, the n-shaped connecting plate is fixed and limited on the convex block, shaking does not occur when the crucible moves, the stability of the crucible is ensured, the electromagnet is electrified when the crucible needs to be stirred, the electromagnet is electrified to generate magnetism to suck the sliding iron block downwards, the sliding iron block drives the braking plate to be separated from the n-shaped connecting plate, the convex block is convenient to rotate along the n-shaped connecting plate, and the fixed crucible is convenient to rotate to a discharging angle.
The rare earth modified 5-series alloy has the tensile strength of over 330MPa, the yield strength of over 210MPa and the elongation of 13 percent; the rare earth modified 5-series alloy has the advantages that the exfoliation corrosion result reaches EA grade and above, and the alloy has excellent stress corrosion resistance. The rare earth modified 5-series alloy can be applied to ship production.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method of manufacturing the present invention;
FIG. 2 is a schematic structural view of the present invention;
FIG. 3 is a right side view of the structure of the present invention;
FIG. 4 is a schematic view of the casting machine of the present invention;
FIG. 5 is a left top view of the caster structure of the present invention;
FIG. 6 is a partial cross-sectional view of the structure of the melting furnace of the present invention;
FIG. 7 is a sectional view of the aluminum water receiving cavity and the connecting structure thereof according to the present invention;
FIG. 8 is a cross-sectional view of the cross bar and its connecting structure of the present invention;
FIG. 9 is an enlarged view of the structure at A of FIG. 5 according to the present invention;
FIG. 10 is an enlarged view of the structure at B of FIG. 7 according to the present invention;
FIG. 11 is an enlarged view of the structure of FIG. 8 at C according to the present invention;
FIG. 12 is a cross-sectional view of a semicircular scraper and its attachment structure of the present invention;
in the drawings, the reference numbers indicate the following list of parts:
1. crucible 2, smelting furnace 3, standing furnace 301, air inlet pipe 302, casting pipe 303, air outlet pipe 4, casting machine 401, first support frame 402, first support plate 403, molten aluminum receiving cavity 404, water spray pipe 405, straight plate 406, water inlet pipe 407, casting mold 408, first drive roller 409, drive wheel 410, conveyor belt 411, second support frame 412, speed reducing motor 413, slide hole 414, sheet water pipe 415, water receiving tank 416, belt 417, first belt pulley 418, second belt pulley 419, second drive roller 420, striking plate 421, spring 422, U-shaped straight plate 423, L-shaped slide plate 424, drive belt 425, cam 426, mounting frame 427, U-shaped guide groove 428, cross bar 429, straight bar 430, inner ring 431, striking block 432, outer ring 433, second support plate 434, casting pipe 435, first electric push rod 436, connection straight bar 437, semi-circular push rod scraper 438, second electric push rod scraper 439, mounting groove 440, sliding groove 441, push plate 442, projection 443, L-shaped driving block 444, rotating pin 445, hinge 5, homogenizing box 6, peripheral segregation layer removing box 7 and forming machine.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The present invention will be further described with reference to the following examples.
Example one
In this example, the rare earth modified high-strength corrosion-resistant 5-series marine aluminum alloy comprises the following raw materials in percentage by mass: si: 0.4%, Fe:0.3%, Cu: 0.35%, Mn: 1.1%, Mg: 4.0%, Cr 0.3%, Zn 0.35%, Ti 0.15%, Zr: 0.25 percent; simultaneously adding rare earth elements Sc: 0.1 percent and 0.2 percent of Zr; the balance being Al.
A method for manufacturing a rare earth modified high-strength corrosion-resistant 5-series ship aluminum alloy comprises the following specific steps:
1) smelting treatment: smelting aluminum alloy according to the mass fraction: sequentially adding an aluminum ingot, an aluminum-copper intermediate alloy, an aluminum-manganese intermediate alloy, an aluminum-chromium intermediate alloy, an aluminum-zirconium intermediate alloy, an aluminum-scandium intermediate alloy, a zinc ingot and the like into a crucible, then adding the crucible into a smelting furnace for smelting, simultaneously adding a slag removing agent for removing slag after the ingredients are completely melted, performing electromagnetic stirring for more than 2 times, adding a magnesium ingot into a melt when the temperature of the melt reaches 750 ℃, stirring, and controlling the temperature of the melt at 720 ℃;
2) furnace guiding and refining: introducing the melt obtained in the step 1) into a standing furnace through a furnace guide groove, introducing a No. 2 refining agent into the melt by using argon gas for refining, and then slagging off;
3) heating and standing: controlling the temperature of the melt obtained in the step 2) at 775 ℃, and standing for 30 min;
4) casting: adding the melt obtained in the step 3) into a casting machine for casting, adding a proper amount of Al-Ti-B wires on line during casting, controlling the casting speed at 90mm/min and controlling the cooling water flow at 50L/min;
5) homogenizing cast ingots: adding the ingot obtained in the step 4) into a homogenizing box for homogenizing treatment, keeping the temperature at 460 ℃, and then discharging and air cooling;
6) removing a segregation layer from the cast ingot: adding the ingot obtained in the step 5) into a peripheral segregation layer removing box to remove the turning 4mm, and removing the peripheral segregation layer of the ingot;
7) profile extrusion: heating the ingot obtained in the step 6) to 460 ℃, and adding the ingot into a forming machine for extrusion production by naturally cooling the ingot to room temperature at the speed of 1.5 m/min;
8) stretching the section bar: the profile obtained in step 7) was subjected to a drawing treatment, and the draw ratio was 3% for a profile having a length of 10 m.
Example two
In the embodiment of the rare earth modified high-strength corrosion-resistant 5-series marine aluminum alloy, the rare earth modified high-strength corrosion-resistant 5-series marine aluminum alloy comprises the following raw materials in percentage by mass: 0.3% of Si, 0.4% of Fe, 0.3% of Cu, Mn: 0.6%, Mg: 5.5%, Cr 0.4%, Zn 0.55%, Ti 0.1%, Zr:0.1 percent; simultaneously adding rare earth elements Sc: 0.5 percent of Zr and 0.1 percent of Zr; the balance being Al.
A method for manufacturing a rare earth modified high-strength corrosion-resistant 5-series ship aluminum alloy comprises the following specific steps:
1) smelting treatment: smelting aluminum alloy according to the mass fraction: sequentially adding an aluminum ingot, an aluminum-copper intermediate alloy, an aluminum-manganese intermediate alloy, an aluminum-chromium intermediate alloy, an aluminum-zirconium intermediate alloy, an aluminum-scandium intermediate alloy, a zinc ingot and the like into a crucible, then adding the crucible into a smelting furnace for smelting, simultaneously adding a slag removing agent for removing slag after the ingredients are completely melted, performing electromagnetic stirring for more than 2 times, adding a magnesium ingot into a melt when the temperature of the melt reaches 730 ℃, stirring, and controlling the temperature of the melt to 780 ℃;
2) furnace guiding and refining: introducing the melt obtained in the step 1) into a standing furnace through a furnace guide groove, introducing a No. 2 refining agent into the melt by using argon gas for refining, and then slagging off;
3) heating and standing: controlling the temperature of the melt obtained in the step 2) at 745 ℃, and standing for 30 min;
4) casting: adding the melt obtained in the step 3) into a casting machine for casting, adding a proper amount of Al-Ti-B wires on line during casting, controlling the casting speed at 60mm/min and controlling the cooling water flow at 90L/min;
5) homogenizing cast ingots: adding the ingot obtained in the step 4) into a homogenizing box for homogenizing treatment, keeping the temperature at 475 ℃ for 24h, and then discharging and air cooling;
6) removing a segregation layer from the cast ingot: adding the ingot obtained in the step 5) into a peripheral segregation layer removing box to remove the turning for 2mm, and removing the peripheral segregation layer of the ingot;
7) profile extrusion: heating the cast ingot obtained in the step 6) to 440 ℃, and adding the cast ingot into a forming machine for extrusion production by naturally cooling the cast ingot to room temperature at the speed of 0.6 m/min;
8) stretching the section bar: the profile obtained in step 7) was subjected to a drawing treatment, and the draw ratio was 1% for a profile having a length of 10 m.
The tensile strength of the rare earth modified 5-series alloy can reach more than 330MPa, the yield strength can reach more than 210MPa, and the elongation can reach 13%; the rare earth modified 5-series alloy has the advantages that the exfoliation corrosion result reaches EA grade and above, and the alloy has excellent stress corrosion resistance. The rare earth modified 5-series alloy can be applied to ship production.
EXAMPLE III
Example three is a further modification to example 1.
As shown in fig. 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, the manufacturing device of the rare earth modified high-strength corrosion-resistant 5-series ship aluminum alloy comprises a crucible 1, a smelting furnace 2, a standing furnace 3, a casting machine 4, a homogenizing box 5, a peripheral segregation layer removing box 6 and a forming machine 7, wherein the crucible 1 is arranged in the smelting furnace 2, both sides of the middle upper end of the standing furnace 3 are respectively and fixedly connected with an air inlet pipe 301 and an air outlet pipe 303, and the bottom of the air inlet pipe 301 is fixedly connected with a casting pipe 302; the standing furnace 3 adds molten aluminum into the casting machine 4 through a casting pipe 302 for molding, an aluminum ingot molded in the casting machine 4 is conveyed into the homogenizing box 5 for homogenizing treatment, the aluminum ingot in the homogenizing box 5 is added into the peripheral segregation layer removing box 6 through an external conveying structure for removing a peripheral segregation layer of an ingot, and the aluminum ingot from which the peripheral segregation layer of the ingot is removed is added into the molding machine 7 through the external conveying structure for extrusion molding;
the casting machine 4 comprises a first support frame 401, the first support frame 401 is connected with an even casting structure for even casting, the even casting structure comprises a first support plate 402, an aluminum water receiving cavity 403, a casting mold 407, a first driving roller 408, a driving wheel 409, a speed reducing motor 412, a driving belt 424, a cross rod 428, a straight rod 429, an inner ring 430, a shifting block 431, an outer ring 432, a second support plate 433 and a casting pipe 434, the inner wall of the first support frame 401 is evenly and fixedly connected with the first driving roller 408 through an even and fixedly connected bearing, the outer wall of the first driving roller 408 is movably connected with the driving wheel 409, the driving belt 424 is movably connected with the driving wheel 409 in a limiting way, the outer wall of the driving belt 424 is evenly and fixedly connected with the casting mold 407, the right end of the first support frame 401 is respectively and fixedly connected with the first support plate 402 and the second support plate 433, the first support plate 402 is rotatably connected with the cross rod 428 through a fixedly connected bearing, the cross rod 428 is fixedly connected with an aluminum water receiving cavity 403, the second supporting plate 433 is rotatably connected with the aluminum water receiving cavity 403 through a bearing fixedly connected with the aluminum water receiving cavity 403, the lowest end of the aluminum water receiving cavity 403 is uniformly and fixedly connected with a casting pipe 434 along the circumferential direction, the outer wall of the aluminum water receiving cavity 403 is fixedly connected with an inner ring 430, the outer wall of the inner ring 430 is uniformly and fixedly connected with a straight rod 429, the outer end of the straight rod 429 is fixedly connected with an outer ring 432, the outer wall of the outer ring 432 is uniformly and fixedly connected with a shifting block 431 along the circumferential direction, the mounting positions of the shifting block 431 and the mounting positions of the casting pipe 434 are arranged in a one-to-one correspondence manner, one group of the first driving rollers 408 is fixedly connected with the output end of the speed reducing motor 412, the liquid outlet end of the casting pipe 302 is arranged in the aluminum water receiving cavity 403, and the speed reducing motor 412 is fixedly mounted on the outer wall of the first supporting frame 401, so that continuous casting molding is convenient;
the first support plate 402 is connected with a slag removing structure for removing slag of the casting pipe 434, the slag removing structure comprises an installation frame 426, a U-shaped guide groove 427, a first electric push rod 435, a connecting straight rod 436, a semicircular scraper 437, a second electric push rod 438, an installation groove 439, a chute 440, a push plate 441, a bump 442, an L-shaped driving block 443, a rotating pin 444 and a hinge 445, the top of the first support plate 402 is fixedly connected with the U-shaped guide groove 427, the U-shaped guide groove 427 is fixedly connected with the installation frame 426, the installation frame 426 is fixedly connected with the first electric push rod 435, the output end of the first electric push rod 435 is fixedly connected with the connecting straight rod 436, the bottom of the connecting straight rod 436 is provided with the installation groove 439, the chute 440 is symmetrically arranged at the lower end of the installation groove 439 of the connecting straight rod 436, the inner top of the installation groove 439 is fixedly connected with the second electric push rod 438, and the output end of the second electric push rod 438 is fixedly connected with the push plate 441, the push plate 441 is in sliding connection with the chute 440 in an attaching manner, both ends of the push plate 441 are fixedly connected with L-shaped driving blocks 443, the second supporting plate 433 is rotatably connected with a rotating pin 444, the rotating pin 444 is fixedly connected with a projection 442, the projection 442 is fixedly connected with a semicircular scraper 437, the semicircular scraper 437 is fixedly connected with a hinge 445, the hinge 445 is fixedly installed at the bottom of the connecting straight rod 436, the semicircular scrapers 437 rotate to be attached to each other when the output end of the second electric push rod 438 extends, the semicircular scrapers 437 rotate to be unfolded to be attached to and slidably connected with the inner wall of the casting pipe 434 when the output end of the second electric push rod 438 retracts, the uppermost casting pipe 434 moves right above the U-shaped material guiding groove 427 when the casting pipe 434 performs casting, the uppermost end of the output end of the mounting rack 426 faces the uppermost end of the casting pipe 434, the uppermost end of the casting pipe 434 moves right above the U-shaped material guiding groove 427 when the lowermost end of the casting pipe 434 rotates to be right above the U-shaped material guiding groove 427 of the slag removing structure, the telescopic end of the second electric push rod 438 extends, the second electric push rod 438 drives the push plate 441 to move, the push plate 441 drives the L-shaped driving block 443 to move, the second supporting plate 433 pushes the semicircular scraper blade 437 to rotate along the second supporting plate 433, the semicircular scraper blade 437 rotates to be mutually attached, then the semicircular scraper blade 437 rotates to unfold to be attached to the inner wall of the casting pipe 434 when the output end of the second electric push rod 438 is recovered, the first electric push rod 435 drives the connecting straight rod 436 to move, the first electric push rod 435 drives the semicircular scraper blade 437 to move, and the semicircular scraper blade 437 slides in the casting pipe 434 to scrape off impurities bonded on the interior of the casting pipe 434, so that the interior of the casting pipe 434 is kept in a cleaning state, the impurities are prevented from influencing the falling speed of aluminum liquid, and the aluminum liquid casting device is beneficial to practical use;
a cooling structure is arranged at the middle end of the first support frame 401, the cooling structure comprises a water spraying pipe 404, a straight plate 405, a water inlet pipe 406, a sliding hole 413, a water receiving tank 414 and a water receiving tank 415, the sliding hole 413 is formed in the first support frame 401 in one group, the water receiving tank 415 is connected in the sliding hole 413 in an attached and sliding mode, the water receiving tank 415 is fixedly connected to the bottom of the outer end of the water receiving tank 415, the straight plate 405 is fixedly connected to the top of the first support frame 401 in the other group, the water spraying pipes 404 are uniformly and fixedly connected to the straight plate 405, the water spraying pipes 404 are fixedly connected to the water inlet pipe 406, and the water inlet pipe 406 is connected with an external power water source, so that the aluminum ingot formed in the casting mold 407 can be rapidly cooled conveniently;
the left end of the first support frame 401 is provided with a beating structure, the beating structure comprises a beating plate 420, a spring 421, a U-shaped straight plate 422, an L-shaped sliding plate 423 and a cam 425, the bottom of the U-shaped straight plate 422 is fixedly connected with the spring 421, the bottom of the spring 421 is fixedly connected with the beating plate 420, the top of the beating plate 420 is fixedly connected with the L-shaped sliding plate 423, the cam 425 is fixedly arranged on the first drive roller 408 at the leftmost end, the top of the cam 425 is in contact with the bottom of the transverse part of the L-shaped sliding plate 423 in an attaching manner, the upright part of the L-shaped sliding plate 423 is in sliding connection with a sliding hole formed in the U-shaped straight plate 422, two ends of the U-shaped straight plate 422 are uniformly and fixedly connected with the inner wall of the first support frame 401, the first drive roller 408 rotates, the first drive roller 408 drives the cam 425 of the beating structure to rotate, the protruding part of the cam 425 intermittently contacts with the L-shaped sliding plate 423, the cam 425 pushes the L-shaped sliding plate 423 upwards, the cam 425 drives the beating plate 420 to move downwards after the cam 425 is separated from the L-shaped sliding plate 423, the striking plate 420 realizes intermittent striking of the casting mold 407, so that an aluminum ingot formed in the casting mold 407 is conveniently discharged;
the left lower end of the first support frame 401 is connected with a blanking structure for blanking, the blanking structure comprises a conveyor belt 410, a second support frame 411, a belt 416, a first belt pulley 417, a second belt pulley 418 and a second drive roller 419, the second support frame 411 is uniformly and fixedly connected with the second drive roller 419 through a bearing which is fixedly connected, the outer wall of the second drive roller 419 is movably connected with the conveyor belt 410, one group of the conveyor belt 410 is fixedly connected with a first belt pulley 417, the first belt pulley 417 is movably connected with the belt 416, the belt 416 is movably connected with the second belt pulley 418, the second belt pulley 418 is fixedly connected with one group of the first drive rollers 408, the first drive roller 408 drives the second belt pulley 418 of the blanking structure to rotate, the second belt pulley 418 drives the first belt pulley 417 to rotate through the belt 416, the first belt pulley 417 drives the second belt pulley 418 to rotate, the second belt pulley 418 drives the conveyor belt 410 to rotate, the aluminum ingot convenient to discharge is conveyed to the next station for continuous processing.
The crucible 1 is also provided with an electromagnetic stirring structure.
When the crucible type static furnace is used, a crucible 1 is arranged in a smelting furnace 2, two sides of the middle upper end of a static furnace 3 are respectively and fixedly connected with an air inlet pipe 301 and an air outlet pipe 303, and the bottom of the air inlet pipe 301 is fixedly connected with a casting pipe 302; the standing furnace 3 adds aluminum liquid into the aluminum water receiving cavity 403 through the casting pipe 302, then the speed reducing motor 412 of the uniform casting structure drives the first driving roller 408 to rotate, the first driving roller 408 drives the driving belt 424 to rotate, the driving belt 424 drives the casting die 407 to rotate, the casting die 407 rotates with the shifting block 431, the shifting block 431 pushes the aluminum water receiving cavity 403 to intermittently rotate through the cooperation of the straight rod 429, the inner ring 430 and the outer ring 432, the aluminum water receiving cavity 403 drives the casting pipe 434 to intermittently rotate to the position right above the casting die 407, the aluminum liquid in the aluminum water receiving cavity 403 enters the casting die 407 through the casting pipe 434 to be cast and molded, the casting pipe 434 at the uppermost end moves to the position right above the U-shaped material guiding groove of the slag removing structure when the casting pipe 434 rotates to the lowermost end, at the moment, the speed reducing motor 412 stops rotating for 5s, the telescopic end of the second electric push rod 438 extends, the second electric push rod 438 drives the push plate 441 to move, the push plate 441 drives the L-shaped driving block 443 to move, the second supporting plate 433 pushes the semicircular scraping plate 437 to rotate along the second supporting plate 433, the semicircular scraping plates 437 rotate to be mutually attached, then the semicircular scraping plates 437 rotate to be unfolded to be attached to the inner wall of the casting pipe 434 when the output end of the second electric push rod 438 is retracted, the first electric push rod 435 drives the connecting straight rod 436 to move, the first electric push rod 435 drives the semicircular scraping plates 437 to move, the semicircular scraping plates 437 slide in the casting pipe 434 to scrape off impurities bonded on the inner surface of the casting pipe 434, the inside of the casting pipe 434 is ensured to be in a clean state, the impurities are prevented from influencing the falling speed of the aluminum liquid, and the practical use is facilitated; the casting die 407 drives an aluminum ingot to be braked to a position right below a water spraying pipe 404 of the cooling structure, water is added into the water spraying pipe 404 through a water inlet pipe 406, the water spraying pipe 404 sprays water to rapidly cool the aluminum ingot, the water for cooling falls into a water receiving tank 415 to be collected, when the cooled aluminum ingot moves to the lower left end of a first support frame 401, a first driving roller 408 drives a cam 425 of a beating structure to rotate, the protruding part of the cam 425 intermittently contacts with an L-shaped sliding plate 423, the cam 425 pushes the L-shaped sliding plate 423 upwards, the cam 425 and the L-shaped sliding plate 423 are separated, a spring 421 drives a beating plate 420 to move downwards, the beating plate 420 realizes intermittent beating on the casting die 407, and the aluminum ingot formed in the casting die 407 is conveniently discharged; meanwhile, the first driving roller 408 drives a second belt pulley 418 of the blanking structure to rotate, the second belt pulley 418 drives a first belt pulley 417 to rotate through a belt 416, the first belt pulley 417 drives a second belt pulley 418 to rotate, the second belt pulley 418 drives a conveying belt 410 to rotate, the aluminum ingot discharged conveniently is conveyed to the next station for continuous processing, the aluminum ingot formed in the casting machine 4 is conveyed to the homogenizing box 5 for homogenization treatment, the aluminum ingot in the homogenizing box 5 is added into the peripheral segregation layer removing box 6 through an external conveying structure to remove the peripheral segregation layer of the ingot, the aluminum ingot from which the peripheral segregation layer of the ingot is removed is added into the forming machine 7 through the external conveying structure to be extruded and formed into a shape
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise forms disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims (8)

1. A manufacturing device of rare earth modified high-strength corrosion-resistant 5-series ship aluminum alloy,
the method is characterized in that: the crucible forming device comprises a crucible (1), a smelting furnace (2), a standing furnace (3), a casting machine (4), a homogenizing box (5), a peripheral segregation layer removing box (6) and a forming machine (7), wherein the crucible (1) is arranged in the smelting furnace (2), two sides of the middle upper end of the standing furnace (3) are fixedly connected with an air inlet pipe (301) and an air outlet pipe (303) respectively, and the bottom of the air inlet pipe (301) is fixedly connected with a casting pipe (302); the static furnace (3) adds molten aluminum into a casting machine (4) through a casting pipe (302) for forming, aluminum ingots formed in the casting machine (4) are conveyed into a homogenizing box (5) for homogenizing treatment, the aluminum ingots in the homogenizing box (5) are added into a peripheral segregation layer removing box (6) through an external conveying structure to remove a peripheral segregation layer of the ingot, and the aluminum ingots from which the peripheral segregation layer of the ingot is removed are added into a forming machine (7) through the external conveying structure for extrusion forming;
the casting machine (4) comprises a first support frame (401), the first support frame (401) is connected with an even casting structure for even casting, the even casting structure comprises a first support plate (402), an aluminum water receiving cavity (403), a casting mold (407), a first driving roller (408), a driving wheel (409), a speed reducing motor (412), a driving belt (424), a cross rod (428), a straight rod (429), an inner ring (430), a poking block (431), an outer ring (432), a second support plate (433) and a casting pipe (434), the inner wall of the first support frame (401) is evenly and fixedly connected with the first driving roller (408) through bearings which are evenly and fixedly connected, the outer wall of the first driving roller (408) is movably connected with the driving wheel (409), the driving belt (424) is movably connected with the limiting position of the driving wheel (409), and the outer wall of the driving belt (424) is evenly and fixedly connected with the casting mold (407), the right end of the first support frame (401) is fixedly connected with a first support plate (402) and a second support plate (433) respectively, the first support plate (402) is rotatably connected with a cross rod (428) through a bearing fixedly connected with the first support plate, the cross rod (428) is fixedly connected with an aluminum water receiving cavity (403), the second support plate (433) is rotatably connected with the aluminum water receiving cavity (403) through a bearing fixedly connected with the second support plate, the lowest end of the aluminum water receiving cavity (403) is uniformly and fixedly connected with a casting pipe (434) along the circumferential direction, the outer wall of the aluminum water receiving cavity (403) is fixedly connected with an inner ring (430), the outer wall of the inner ring (430) is uniformly and fixedly connected with a straight rod (429), the outer end of the straight rod (429) is fixedly connected with an outer ring (432), the outer wall of the outer ring (432) is uniformly and fixedly connected with a stirring block (431) along the circumferential direction, the mounting positions of the toggle blocks (431) and the mounting positions of the casting pipes (434) are arranged in a one-to-one correspondence manner, and one group of first driving rollers (408) are fixedly connected with the output end of the speed reducing motor (412);
the slag removing structure for removing slag of the casting pipe (434) is connected to the first supporting plate (402), the slag removing structure comprises a mounting frame (426), a U-shaped guide groove (427), a first electric push rod (435), a connecting straight rod (436), a semicircular scraper (437), a second electric push rod (438), a mounting groove (439), a sliding groove (440), a push plate (441), a convex block (442), an L-shaped driving block (443), a rotating pin shaft (444) and a hinge (445), the top of the first supporting plate (402) is fixedly connected with the U-shaped guide groove (427), the U-shaped guide groove (427) is fixedly connected with the mounting frame (426), the mounting frame (426) is fixedly connected with the first electric push rod (435), the output end of the first electric push rod (435) is fixedly connected with the connecting straight rod (436), and the bottom of the connecting straight rod (436) is provided with the mounting groove (439), the connecting straight rod (436) is symmetrically provided with sliding grooves (440) at the lower end of the mounting groove (439), the inner top of the mounting groove (439) is fixedly connected with a second electric push rod (438), the output end of the second electric push rod (438) is fixedly connected with a push plate (441), the push plate (441) is in fit sliding connection with the sliding grooves (440), two ends of the push plate (441) are fixedly connected with an L-shaped driving block (443), the second supporting plate (433) is rotatably connected with a rotating pin shaft (444), the rotating pin shaft (444) is fixedly connected with a convex block (442), the convex block (442) is fixedly connected with a semicircular scraper (437), the semicircular scraper (437) is fixedly connected with a hinge (445), the hinge (445) is fixedly arranged at the bottom of the connecting straight rod (436), and the semicircular scraper (437) rotates to fit with each other when the output end of the second electric push rod (438) extends, when the output end of the second electric push rod (438) is retracted, the semicircular scraper (437) rotates and expands to be attached to and slidably connected with the inner wall of the casting pipe (434);
the middle end of the first support frame (401) is provided with a cooling structure, the cooling structure comprises a water spraying pipe (404), a straight plate (405), a water inlet pipe (406), a sliding hole (413), a water sheet pipe (414) and a water receiving tank (415), the sliding hole (413) is formed in one group of the first support frame (401), the water receiving tank (415) is connected in the sliding hole (413) in a splicing and sliding mode, the water sheet pipe (414) is fixedly connected to the bottom of the outer end of the water receiving tank (415), the straight plate (405) is fixedly connected to the top of the other group of the first support frame (401), the water spraying pipes (404) are uniformly and fixedly connected to the straight plate (405), the water spraying pipes (404) are fixedly connected to the water inlet pipe (406), and the water inlet pipe (406) is connected with an external power water source;
the left end of the first support frame (401) is provided with a knocking structure, the knocking structure comprises a knocking plate (420), a spring (421), a U-shaped straight plate (422), an L-shaped sliding plate (423) and a cam (425), the bottom of the U-shaped straight plate (422) is fixedly connected with the spring (421), the bottom of the spring (421) is fixedly connected with the knocking plate (420), the top of the knocking plate (420) is fixedly connected with the L-shaped sliding plate (423), the cam (425) is fixedly arranged on the first driving roller (408) at the leftmost end, and the top of the cam (425) is in fit contact with the bottom of the transverse part of the L-shaped sliding plate (423);
the blanking structure for blanking is connected to the left lower end of the first supporting frame (401), the blanking structure comprises a conveying belt (410), a second supporting frame (411), a belt (416), a first belt pulley (417), a second belt pulley (418) and a second driving roller (419), the second supporting frame (411) is uniformly and fixedly connected with a second driving roller (419) through a bearing which is fixedly connected, the outer wall of the second driving roller (419) is movably connected with the conveying belt (410), the conveying belt (410) in one group is fixedly connected with the first belt pulley (417), the first belt pulley (417) is movably connected with the belt (416), and the belt (416) is movably connected with the second belt pulley (418);
the manufacturing method of the rare earth modified high-strength corrosion-resistant 5-series ship aluminum alloy comprises the following specific steps:
1) smelting treatment: smelting aluminum alloy according to the mass fraction: sequentially adding an aluminum ingot, an aluminum-copper intermediate alloy, an aluminum-manganese intermediate alloy, an aluminum-chromium intermediate alloy, an aluminum-zirconium intermediate alloy, an aluminum-scandium intermediate alloy and a zinc ingot into a crucible, adding the crucible into a smelting furnace for smelting, simultaneously adding a slag removing agent for removing slag after the ingredients are completely melted, performing electromagnetic stirring for more than 2 times, adding a magnesium ingot into the melt when the temperature of the melt reaches 730-;
2) furnace guiding and refining: introducing the melt obtained in the step 1) into a standing furnace through a furnace guide groove, introducing a No. 2 refining agent into the melt by using argon gas for refining, and then slagging off;
3) heating and standing: controlling the temperature of the melt obtained in the step 2) at 745-775 ℃, and standing for 30 min;
4) casting: adding the melt obtained in the step 3) into a casting machine for casting, adding a proper amount of Al-Ti-B wires on line during casting, controlling the casting speed at 60-90mm/min and controlling the cooling water flow at 50-90L/min;
5) homogenizing cast ingots: adding the ingot obtained in the step 4) into a homogenizing box for homogenizing treatment, keeping the temperature for 24h at the homogenizing temperature of 460-475 ℃, and then discharging from the furnace for air cooling;
6) removing a segregation layer from the cast ingot: adding the ingot obtained in the step 5) into a peripheral segregation layer removing box to remove the turning for 2-4mm, and removing the peripheral segregation layer of the ingot;
7) profile extrusion: heating the ingot obtained in the step 6) to 440-460 ℃, and adding the ingot into a forming machine for extrusion production by adopting natural cooling to room temperature, wherein the speed of the section bar is 0.6-1.5 m/min;
8) stretching the section bar: and (3) stretching the section bar obtained in the step 7), wherein the stretching rate of the section bar with the length of 6-10m is 1-3%.
2. The apparatus for manufacturing a rare earth-modified high-strength corrosion-resistant 5-line marine aluminum alloy according to claim 1, wherein: the crucible (1) is also provided with an electromagnetic stirring structure.
3. The apparatus for manufacturing a rare earth-modified high-strength corrosion-resistant 5-line marine aluminum alloy according to claim 2, wherein: the speed reducing motor (412) is fixedly arranged on the outer wall of the first support frame (401).
4. The apparatus for manufacturing a rare earth-modified high-strength corrosion-resistant 5-line marine aluminum alloy according to claim 3, wherein: the liquid outlet end of the casting pipe (302) is arranged in the aluminum water containing cavity (403).
5. The apparatus for manufacturing a rare earth-modified high-strength corrosion-resistant 5-line marine aluminum alloy according to claim 4, wherein: when the casting pipes (434) are cast, the uppermost casting pipe (434) moves to a position right above the U-shaped material guide groove (427), and the output end of the mounting rack (426) is opposite to the uppermost casting pipe (434).
6. The apparatus for manufacturing a rare earth-modified high-strength corrosion-resistant 5-line marine aluminum alloy according to claim 5, wherein: the upright part of the L-shaped sliding plate (423) is connected with a sliding hole arranged on the U-shaped straight plate (422) in a sliding way.
7. The apparatus for manufacturing a rare earth-modified high-strength corrosion-resistant 5-line marine aluminum alloy according to claim 6, wherein: two ends of the U-shaped straight plate (422) are uniformly and fixedly connected with the inner wall of the first support frame (401).
8. The apparatus for manufacturing a rare earth-modified high-strength corrosion-resistant 5-line marine aluminum alloy according to claim 7, wherein: the second pulley (418) is fixedly connected to one of the first drive rollers (408).
CN202110892006.4A 2021-08-04 2021-08-04 Method for manufacturing rare earth modified high-strength corrosion-resistant 5-series ship aluminum alloy Active CN113684385B (en)

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