CN113857871A - Production method for eliminating ingot casting cracks of 4XXX aluminum alloy wide hot rolled plate - Google Patents
Production method for eliminating ingot casting cracks of 4XXX aluminum alloy wide hot rolled plate Download PDFInfo
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- CN113857871A CN113857871A CN202111121888.0A CN202111121888A CN113857871A CN 113857871 A CN113857871 A CN 113857871A CN 202111121888 A CN202111121888 A CN 202111121888A CN 113857871 A CN113857871 A CN 113857871A
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- 238000005266 casting Methods 0.000 title claims abstract description 58
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 25
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 19
- 238000005096 rolling process Methods 0.000 claims abstract description 25
- 238000003723 Smelting Methods 0.000 claims abstract description 16
- 238000005098 hot rolling Methods 0.000 claims abstract description 15
- 238000005520 cutting process Methods 0.000 claims abstract description 13
- 208000029152 Small face Diseases 0.000 claims abstract description 3
- VRAIHTAYLFXSJJ-UHFFFAOYSA-N alumane Chemical compound [AlH3].[AlH3] VRAIHTAYLFXSJJ-UHFFFAOYSA-N 0.000 abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 description 8
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000001816 cooling Methods 0.000 description 6
- 239000000155 melt Substances 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 238000005242 forging Methods 0.000 description 3
- 238000007670 refining Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 229910018125 Al-Si Inorganic materials 0.000 description 1
- 229910018520 Al—Si Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P23/00—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass
- B23P23/04—Machines or arrangements of machines for performing specified combinations of different metal-working operations not covered by a single other subclass for both machining and other metal-working operations
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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
- C22C1/026—Alloys based on aluminium
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- 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
- C22F1/043—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 silicon as the next major constituent
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
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- Organic Chemistry (AREA)
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- Crystallography & Structural Chemistry (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a production method for eliminating ingot cracks of a 4XXX aluminum alloy wide hot-rolled plate, which comprises the steps of burdening, smelting, casting, sawing, hot rolling and transverse cutting in sequence, wherein the smelting temperature is 710-770 ℃; the casting temperature is 670-710 ℃, the ingot casting width is = the width of the plate finished product is- (0-400) mm, the cross section of the ingot casting is a flat hexagon which is bilaterally symmetrical, and the included angle of two small faces on the side edge is not less than 120o(ii) a The length of the cast ingot after sawing is less than the width of the roller surface of the hot rolling mill; and (3) firstly, transversely rolling the ingot casting during hot rolling, wherein the width of the ingot casting after the transverse rolling is = the width of the finished plate plus (50-200) mm, and then longitudinally rolling the ingot casting until the thickness of the finished plate is reached. The invention can solve the problems that the existing production method of the 4XXX aluminum-aluminum alloy flower plate is unreasonable and cracks are easy to occur.
Description
Technical Field
The invention relates to the technical field of composite aluminum plates, in particular to a production method for eliminating ingot casting cracks of a 4XXX aluminum alloy wide hot rolled plate.
Background
The aluminium plates of the 4XXX series belong to the Al-Si containing alloys. The metal has good fluidity and less solidification and shrinkage, and belongs to building materials, mechanical parts, forging materials and welding materials; low melting point, good corrosion resistance, heat resistance and wear resistance.
The existing production process of the 4XXX aluminum-aluminum alloy flower plate generally comprises the steps of material preparation, smelting, casting, saw cutting, hot rolling and transverse cutting. In the actual production process of the 4XXX aluminum-aluminum alloy pattern plate, when an ingot (generally cut into a cuboid with a cross section of a step table) is subjected to casting after batching and smelting, cracks are very easy to occur to cause ingot rejection, the edge cracks are easy to occur on a large surface (namely an upper plane and a lower plane with large areas) when the casting speed is high, and the side surface cracks tend to be serious when the casting speed is low. This is because, in the continuous casting, the side surfaces of the ingot are cooled on three sides, while the central portion of the large surface is cooled on two sides, and the temperature gradient and cooling rate of the side surfaces (side surfaces on both sides of the large surface) in the axial direction of the ingot greatly exceed the temperature gradient and cooling rate of the central portion of the large surface in the axial direction of the ingot, thereby causing tensile stress acting in the height direction to be generated on the side surfaces of the ingot. The ingot is wide, and the larger the width-thickness ratio, the larger the temperature difference between the small surface (two small planes on the left and right) and the central part of the large surface of the ingot, and the more serious the crack tendency.
Disclosure of Invention
The invention aims to solve the problem that the existing production method of the 4XXX aluminum alloy flower plate is unreasonable and easy to crack.
In order to solve the problems, the technical scheme of the invention is as follows: the production method for eliminating the 4XXX aluminum alloy wide hot rolled plate ingot casting cracks comprises the steps of burdening, smelting, casting, saw cutting, hot rolling and transverse cutting in sequence, and is characterized in that: the smelting temperature is 710-770 ℃; the casting temperature is 670-710 ℃, the ingot casting width is equal to the plate compositionThe width of the product is (0-400) mm, the cross section of the cast ingot is a flat hexagon which is bilaterally symmetrical, the upper and lower surfaces in the width direction are large surfaces, four surfaces of two side edges are small surfaces, and the included angle between the two small surfaces of the side edges is not less than 120o(ii) a The length of the cast ingot after sawing is less than the width of the roller surface of the hot rolling mill; and (3) firstly, transversely rolling the ingot casting during hot rolling, wherein the width of the ingot casting after the transverse rolling is = the width of the finished plate plus (50-200) mm, and then longitudinally rolling the ingot casting until the thickness of the finished plate is reached.
In order to solve the problems, the technical scheme of the invention is as follows: the smelting temperature is 730-750 ℃.
Further: the casting temperature is 670-690 ℃, the ingot casting width = the width of the plate finished product- (300-400) mm, the cross section of the ingot casting is a flat hexagon which is bilaterally symmetrical, and the included angle of two small faces on the side is 140o。
Further: the length of the cut cast ingot is equal to the width of the roller surface of the hot rolling mill to 100 mm.
Further: the ingot casting width after the transverse rolling = the width of the finished plate +100mm because of the technical proposal,
compared with the prior art, the invention has the following beneficial effects:
according to the production method for eliminating the cracks of the 4XXX aluminum alloy wide hot rolled plate ingot, the width of the forged ingot is 300-400 mm smaller than that of a finished product during forging, and is 400-550 mm smaller than that of the ingot produced by a normal production process, so that the width-thickness ratio of the ingot can be greatly reduced, the temperature gradient and the cooling speed difference of the central parts of the side surface and the large surface of the ingot along the axial direction of the ingot during ingot casting are enabled, and the crack tendency of the ingot is greatly reduced; simultaneously adopts a facet included angle of 140oThe hexagonal section ingot casting increases the included angle between the surfaces of the ingot casting, can reduce the temperature gradient and the cooling speed at the included angle, and further avoids the crack at the included angle; the ingot width is increased by cross rolling during sawing to obtain a sufficient width to produce a finished product without cracking.
Drawings
FIG. 1 is a schematic representation of a cross-section of an ingot of an embodiment of the invention.
Detailed Description
The embodiments of the invention will be described in further detail with reference to the accompanying drawings:
the first embodiment is as follows:
the production method for eliminating ingot casting cracks of the 4XXX aluminum alloy wide hot rolled plate produces aluminum coils 1 and 4032, and comprises the following steps:
a, proportioning, wherein chemical components of the checkered plate are controlled according to the control 4032 brand component in GB/T3190;
b, smelting, namely smelting the prepared materials at the high temperature of 730 ℃ to obtain uniformly distributed melt;
c, casting, namely refining the melt, and then casting into an ingot, wherein the casting temperature is 670 ℃, the width of the ingot is =2400mm, the cross section of the ingot is a bilaterally symmetrical flat hexagon, the upper and lower surfaces in the width direction are large surfaces 1, four surfaces on two side edges are small surfaces 2, and the included angle a =140 of the two small surfaces 2 on the side edgeso；
D, sawing, namely sawing the head and the tail of the cast ingot on a sawing machine, wherein the length of the cast ingot after being sawn is 3200 mm;
e, hot rolling, namely performing hot continuous rolling on the sawn cast ingot, firstly performing transverse rolling, wherein the width of the cast ingot after the transverse rolling is =2900mm, and then performing longitudinal rolling on the cast ingot to 10 mm;
and F, transversely cutting, namely feeding the hot-rolled aluminum coil to a transverse cutting machine and slicing to the specification of a finished product.
The finished product is a cuboid, the width of the finished product is 2800mm, the thickness of the finished product is 10mm, the width of the hot roll surface is 3300mm, and no cracks appear.
Example two:
the production method for eliminating ingot casting cracks of the 4xxx aluminum alloy wide hot rolled plate to produce the aluminum coil 2, alloy 4043, comprises the following steps:
a, proportioning, controlling chemical components of the checkered plate according to a control 4043 mark component in GB/T3190;
b, smelting, namely smelting the prepared materials at a high temperature of 740 ℃ to obtain a uniformly distributed melt;
c, casting, namely refining the melt, and then casting the melt into an ingot with the casting temperature of 680 ℃, the width of the ingot =1700mm, the cross section of the ingot is a flat hexagon which is bilaterally symmetrical, the upper and lower surfaces in the width direction are large surfaces, four surfaces on two side edges are small surfaces, and the included angle between the two small surfaces on the side edges is 120o；
D, sawing, namely sawing the head and the tail of the cast ingot on a sawing machine, wherein the length of the cast ingot after being sawn is 3200 mm;
e, hot rolling, namely performing hot continuous rolling on the sawn cast ingot, firstly performing transverse rolling, wherein the width of the cast ingot after the transverse rolling is =2100mm, and then performing longitudinal rolling on the cast ingot to 8 mm;
and F, transversely cutting, namely feeding the hot-rolled aluminum coil to a transverse cutting machine and slicing to the specification of a finished product.
The finished product is a cuboid, the width of the finished product is 2000mm, the thickness of the finished product is 8mm, the width of the hot roll surface is 3300mm, and no cracks appear.
Example three:
the production method for eliminating ingot casting cracks of the 4xxx aluminum alloy wide hot rolled plate produces an aluminum coil 3 and an alloy 4343, and comprises the following steps:
a, preparing materials, wherein chemical components of the checkered plate are controlled according to a component number of 4343 in GB/T3190;
b, smelting, namely smelting the prepared materials at a high temperature of 750 ℃ to obtain a uniformly distributed melt;
c, casting, namely refining the melt, and then casting the melt into an ingot, wherein the casting temperature is 690 ℃, the width of the ingot is =2150mm, the cross section of the ingot is a bilaterally symmetrical flat hexagon, the upper and lower surfaces in the width direction are large surfaces, four surfaces on two side edges are small surfaces, and the included angle between the two small surfaces on the side edges is 140o；
D, sawing, namely sawing the head and the tail of the cast ingot on a sawing machine, wherein the length of the cast ingot after being sawn is 3200 mm;
e, hot rolling, namely performing hot continuous rolling on the sawn cast ingot, firstly performing transverse rolling, wherein the width of the cast ingot after the transverse rolling is =2600mm, and then performing longitudinal rolling on the cast ingot to 15 mm;
and F, transversely cutting, namely feeding the hot-rolled aluminum coil to a transverse cutting machine and slicing to the specification of a finished product.
The finished product is a cuboid, the width of the finished product is 2500mm, the thickness of the finished product is 15mm, the width of the hot roll surface is 3300mm, and no cracks appear.
According to the production method for eliminating the ingot casting cracks of the 4XXX aluminum alloy wide hot rolled plate, the width of the forged ingot casting is 300-400 mm smaller than that of a finished product in the forging process, and is 400-550 mm smaller than that of the ingot casting in the normal production process, so that the width of the ingot casting can be greatly reducedThe thickness ratio ensures that the temperature gradient and the cooling speed difference of the central parts of the side surface and the large surface of the ingot along the axial direction of the ingot during the casting of the ingot, thereby greatly reducing the crack tendency of the ingot; simultaneously adopts a facet included angle of 140oThe hexagonal section ingot casting increases the included angle between the surfaces of the ingot casting, can reduce the temperature gradient and the cooling speed at the included angle, and further avoids the crack at the included angle; the ingot width is increased by cross rolling during sawing to obtain a sufficient width to produce a finished product without cracking.
Claims (5)
1. The production method for eliminating the ingot casting cracks of the 4XXX aluminum alloy wide hot rolled plate comprises the steps of burdening, smelting, casting, saw cutting, hot rolling and transverse cutting in sequence, and is characterized in that: the smelting temperature is 710-770 ℃; the casting temperature is 670-710 ℃, the ingot casting width = the width of the plate finished product is- (0-400) mm, the cross section of the ingot casting is a flat hexagon which is bilaterally symmetrical, the upper and lower surfaces in the width direction are large surfaces, four surfaces of two side edges are small surfaces, and the included angle of the two small surfaces of the side edge is not less than 120o(ii) a The length of the cast ingot after sawing is less than the width of the roller surface of the hot rolling mill; and (3) firstly, transversely rolling the ingot casting during hot rolling, wherein the width of the ingot casting after the transverse rolling is = the width of the finished plate plus (50-200) mm, and then longitudinally rolling the ingot casting until the thickness of the finished plate is reached.
2. The production method for eliminating the ingot cracks of the 4XXX aluminum alloy wide hot rolled plate according to claim 1, wherein the production method comprises the following steps: the smelting temperature is 730-750 ℃.
3. The production method for eliminating the ingot cracks of the 4XXX aluminum alloy wide hot rolled plate according to claim 2, wherein the production method comprises the following steps: the casting temperature is 670-690 ℃, the ingot casting width = the width of the plate finished product- (300-400) mm, the cross section of the ingot casting is a flat hexagon which is bilaterally symmetrical, and the included angle of two small faces on the side is 140o。
4. The production method for eliminating the ingot cracks of the 4XXX aluminum alloy wide hot rolled plate according to claim 3, wherein the production method comprises the following steps: the length of the cut cast ingot is equal to the width of the roller surface of the hot rolling mill to 100 mm.
5. The production method for eliminating the ingot cracks of the 4XXX aluminum alloy wide hot rolled plate according to claim 4, wherein the production method comprises the following steps: and the width of the cast ingot after the transverse rolling is = the width of the finished plate +100 mm.
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