CN111299347A - Extrusion forming method of wide ribbed thin-wall plate - Google Patents
Extrusion forming method of wide ribbed thin-wall plate Download PDFInfo
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- CN111299347A CN111299347A CN201911315393.4A CN201911315393A CN111299347A CN 111299347 A CN111299347 A CN 111299347A CN 201911315393 A CN201911315393 A CN 201911315393A CN 111299347 A CN111299347 A CN 111299347A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C23/00—Extruding metal; Impact extrusion
- B21C23/02—Making uncoated products
- B21C23/04—Making uncoated products by direct extrusion
- B21C23/06—Making sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C31/00—Control devices, e.g. for regulating the pressing speed or temperature of metal; Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses
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- 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
- C22C21/10—Alloys based on aluminium with zinc as the next major constituent
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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
- C22F1/053—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 zinc as the next major constituent
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Abstract
A method of extrusion forming a wide, ribbed, thin-walled sheet, the method comprising: preparing a preset round ingot blank by adopting a spray forming technology, turning the preset round ingot blank to remove oxide skin, and then carrying out homogenization treatment; cooling the homogenized preset round ingot blank to the required extrusion temperature, and respectively heating the die and the extrusion container to respective specified temperatures; loading the cooled preset round ingot blank and the heated die into a heated extrusion barrel for matched die extrusion so as to extrude the blank from the die to form a wide ribbed thin-walled plate; and (3) sending the wide ribbed thin-wall plate into an aging furnace for aging and heat preservation, cooling to room temperature by air cooling, and performing aging and heat preservation again. The wide-width ribbed thin-wall plate prepared by the method improves the utilization rate of materials, shortens the manufacturing period, reduces the processing cost and is beneficial to the precise forming and processing of aviation structural parts.
Description
Technical Field
The invention relates to the technical field of aluminum alloy plastic deformation, in particular to an extrusion forming method of a wide ribbed thin-wall plate.
Background
With the spanning development of weaponry, the requirements on light weight structures are higher and higher, and the adoption of an integrated structure and high-performance aluminum alloy is two major ways for realizing light weight. Compared with the traditional riveting combined type wallboard structure, the ribbed integral wallboard structure can reduce weight by 7%, and if the integral structure adopts 600 MPa-level aluminum alloy, the weight reduction benefit is more remarkable. At present, the ribbed wallboard structure mainly adopts a mode of machining by using a pre-stretched plate, the method is low in production efficiency and serious in raw material waste, the mechanical properties of produced parts are limited by raw materials, particularly for some high-rib ribbed wallboard structures, the high-rib ribbed wallboard structures cannot be manufactured by adopting the method due to the limitation of hardenability of the raw materials, and the application of ultrahigh-strength aluminum alloy is greatly limited.
The extrusion technology is an efficient, high-quality and low-consumption machining process with few chips, and becomes an extremely important means for metal plastic forming in the departments of machinery, automobiles, aerospace, aviation, war industry, electrical appliances and the like. At present, the domestic 6000 series aluminum alloy is rapidly developed in the aspect of extrusion molding, and breaks through all-round control technologies such as an alloy extrusion molding process, die design and processing, and extruded section structure performance detection and characterization, so that the 6000 series aluminum alloy extruded section is widely applied to industries such as automobiles, high-speed rails and the like. However, in the aspect of the extrusion forming of the ultra-high-strength 7055 and 7034 aluminum alloys for aviation, particularly the extrusion forming of wide-width thin-wall complicated section profiles, although attempts are made by individual units in China, the prior cases of the extrusion forming are still unsuccessful. Therefore, the 7055 high-strength aluminum alloy component is mainly prepared through a thick plate machining mode in China, so that the material is greatly wasted, and the manufacturing cost is not reduced.
At present, two technical problems mainly exist in limiting the application of the ultrahigh-strength aluminum alloy extrusion forming technology: firstly, the preparation of large-diameter ultrahigh-strength aluminum alloy extruded round ingots is difficult; secondly, the residual stress of the wide thin-walled part is difficult to reduce, the wide thin-walled part is easy to deform, and the subsequent straightening is difficult.
Disclosure of Invention
The embodiment of the invention provides an extrusion forming method of a wide ribbed thin-wall plate, which is used for preparing the wide ribbed thin-wall plate through the processes of homogenization treatment, rapid cooling, extrusion forming, aging treatment, heat preservation treatment and the like, improves the utilization rate of materials, shortens the manufacturing period, reduces the processing cost and is beneficial to the precise forming and processing of aviation structural components.
An extrusion forming method of a wide-width ribbed thin-wall plate, wherein the wide-width ribbed thin-wall plate is extruded by an ultrahigh-strength aluminum alloy material, and the extrusion forming method comprises the following steps:
step S10, preparing a preset round ingot blank by adopting a spray forming technology, turning the preset round ingot blank to remove oxide skin, and then carrying out homogenization treatment;
step S11, cooling the homogenized preset round ingot blank to the required extrusion temperature, and respectively heating the die and the extrusion container to respective specified temperatures;
step S12, placing the cooled preset round ingot blank and the heated mould into a heated extrusion barrel for matched die extrusion so as to extrude the blank from the mould to form a wide-width ribbed thin-walled plate, and rapidly cooling the section to room temperature through air cooling;
and step S13, sending the wide thin-walled plate with the ribs into an aging furnace for aging and heat preservation, cooling to room temperature by air cooling, and performing aging and heat preservation again.
Further, the step S12 specifically includes:
placing the cooled preset round ingot blank and the heated mould into a heated extrusion container;
setting the extrusion speed of an extrusion cylinder, and upsetting a preset round ingot blank in a die by using a push rod in the extrusion cylinder;
and increasing the extrusion force of the extrusion cylinder so that the die is filled with the thickened preset round ingot blank, and then the thickened preset round ingot blank is extruded from the die to form the wide ribbed thin-wall plate.
Further, after the step S12, the extrusion forming method further includes:
and (3) feeding the wide ribbed thin-wall plate into an aging furnace for carrying out tertiary aging and heat preservation treatment.
Further, the diameter of the preset round ingot blank is not less than 600mm, and the length of the preset round ingot blank is not less than 1200 mm.
Further, the preset round ingot comprises the following components in percentage by weight: al, Zn, Mg, Cu and Zr, wherein the weight ratio of Zn is 8.2%, the weight ratio of Mg is 2.1%, the weight ratio of Cu is 1.9% and the weight ratio of Zr is 0.15%.
Further, in step S10, the temperature of the homogenization treatment is 450-470 ℃, and the heat preservation time is 8 h.
Further, the extrusion requirement temperature is 380-450 ℃, the specified temperature of the die is 330-380 ℃, and the specified temperature of the extrusion cylinder is 350-380 ℃.
Further, the extrusion speed of the extrusion cylinder is 0.3-0.5 mm/s.
Further, the aging temperature for the first time aging and heat preservation treatment is 110-120 ℃, the heat preservation time is 8-24 h, the time for cooling to room temperature is not more than 3min, the aging temperature for the second time aging and heat preservation treatment is 110-160 ℃, and the heat preservation time is 24-36 h.
Further, the aging temperature for the first time aging and heat preservation treatment is 110-.
In conclusion, the preset round ingot blank is prepared by the spray forming technology, so that the diameter of the preset round ingot blank is not less than 600mm, the microstructure of the preset round ingot blank is fine isometric crystal and has extremely high plasticity, and the wide-width ribbed thin-wall plate is prepared by the processes of homogenization treatment, rapid cooling, extrusion forming, aging treatment, heat preservation treatment and the like, so that the problem of large deformation of the thin-wall part caused by uneven quenching and heating is avoided, and meanwhile, the shrinkage porosity defect in the preset round ingot blank is eliminated by the extrusion forming technology with a large extrusion ratio, so that the utilization rate of materials is improved, the manufacturing period is shortened, the processing cost is reduced, and the precise forming processing of an aviation structural part is facilitated.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method of extrusion forming a wide ribbed thin wall panel in accordance with the present invention.
FIG. 2 is a flow chart of another method of extrusion forming a wide ribbed thin wall panel in accordance with the present invention.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the embodiments described, but covers any modifications, alterations, and improvements in the parts, components, and connections without departing from the spirit of the invention.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Referring to fig. 1, the present invention provides an extrusion forming method for a wide-width ribbed thin-wall plate, wherein the wide-width ribbed thin-wall plate is made of an ultra-high strength aluminum alloy material by extrusion, and the extrusion forming method comprises:
and step S10, preparing a preset round ingot blank by adopting a spray forming technology, turning the preset round ingot blank to remove oxide skin, and then carrying out homogenization treatment.
Specifically, in the step, the temperature of the homogenization treatment is 450-470 ℃, and the heat preservation time is 8 hours.
It should be noted that, in the present invention, since the adopted spray forming technology is based on the rapid solidification principle, the diameter of the prepared predetermined round ingot blank can be not less than 600mm, and the length can be not less than 1200 mm. The microstructure of the prepared preset round ingot blank is fine isometric crystal, has extremely high plasticity, and has a certain shrinkage defect, but the invention adopts a large extrusion ratio, and the cross section area of the extruded and deformed section bar is far smaller than that before deformation, so that the defect of holes in the ingot blank is effectively eliminated.
And step S11, cooling the homogenized preset round ingot blank to the required extrusion temperature, and respectively heating the die and the extrusion container to respective specified temperatures.
Specifically, in this step, for the convenience of the homogenization treatment, the extrusion temperature is 380-450 ℃, the specified temperature of the mold is 330-380 ℃, and the specified temperature of the extrusion cylinder is 350-380 ℃.
And step S12, loading the cooled preset round ingot blank and the heated mould into the heated extrusion barrel for matched die extrusion so as to extrude the blank from the mould to form the wide-width ribbed thin-wall plate.
It should be noted that step S12 specifically includes:
step S121, placing the cooled preset round ingot blank and the heated mould into a heated extrusion container;
step S122, setting the extrusion speed of the extrusion container, and upsetting a preset round ingot blank in a die by using a push rod in the extrusion container;
specifically, in the step, in order to ensure that the deformation is uniformly generated, the extrusion speed of the extrusion cylinder is 0.3-0.5 mm/s.
And S123, increasing the extrusion force of the extrusion cylinder to enable the thickened preset round ingot blank to fill the die, extruding the blank from the die to form a wide ribbed thin-walled plate, and rapidly cooling the profile to room temperature through air cooling.
And step S13, sending the wide thin-walled plate with the ribs into an aging furnace for aging and heat preservation, cooling to room temperature by air cooling, and performing aging and heat preservation again.
It should be noted that, in this step, a two-stage overaging process is adopted to ensure that the material has good comprehensive properties, specifically: the aging temperature for the first time aging and heat preservation treatment is 110-120 ℃, the heat preservation time is 8-24 h, the time for cooling to room temperature is not more than 3min, the aging temperature for the second time aging and heat preservation treatment is 120-160 ℃, and the heat preservation time is 24-36 h.
Referring to fig. 2, the present invention provides another extrusion forming method for a wide-width ribbed thin-wall plate, wherein the wide-width ribbed thin-wall plate is made of an ultra-high strength aluminum alloy material by extrusion, and the extrusion forming method comprises:
step S20, preparing a preset round ingot blank by adopting a spray forming technology, turning the preset round ingot blank to remove oxide skin, and then carrying out homogenization treatment;
step S21, cooling the homogenized preset round ingot blank to the required extrusion temperature, and respectively heating the die and the extrusion container to respective specified temperatures;
step S22, placing the cooled preset round ingot blank and the heated mould into a heated extrusion barrel for matched die extrusion so as to extrude the blank from the mould to form a wide-width ribbed thin-walled plate, and rapidly cooling the section bar to room temperature through air cooling of the extruded wall plate;
and step S23, feeding the wide thin-walled plate with the ribs into an aging furnace for carrying out aging and heat preservation treatment for three times.
It should be noted that, in this step, a multistage regression and reaging process is adopted to improve the comprehensive performance, and the specific process is as follows: the aging temperature for the first time aging and heat preservation treatment is 110-120 ℃, the heat preservation time is 12-24h, the aging temperature for the second time aging and heat preservation treatment is 170-190 ℃, the heat preservation time is 10-60 min, and the aging temperature for the last time aging and heat preservation treatment is 110-120 ℃, and the heat preservation time is 12-24 h.
In the present invention, it is further defined that the composition of the predetermined round ingot blank comprises component 1: al, Zn, Mg, Cu and Zr, wherein the weight ratio of Zn is 8.2%, the weight ratio of Mg is 2.1%, the weight ratio of Cu is 1.9% and the weight ratio of Zr is 0.15%.
In conclusion, the preset round ingot blank is prepared by the spray forming technology, so that the diameter of the preset round ingot blank is not less than 600mm, the microstructure of the preset round ingot blank is fine isometric crystal and has extremely high plasticity, and the wide-width ribbed thin-wall plate is prepared by the processes of homogenization treatment, rapid cooling, extrusion forming, aging treatment, heat preservation treatment and the like, so that the problem of large deformation of the thin-wall part caused by uneven quenching and heating is avoided, and meanwhile, the shrinkage porosity defect in the preset round ingot blank is eliminated by the extrusion forming technology with a large extrusion ratio, so that the utilization rate of materials is improved, the manufacturing period is shortened, the processing cost is reduced, and the precise forming processing of an aviation structural part is facilitated.
The following is a description of specific examples:
example 1:
test materials: spray forming was selected to produce a nominal composition Al-8.2Zn-2.1Mg-1.9Cu-0.15Zr (wt.%) aluminum alloy. The diameter of the initial cast ingot is 600mm, the length of the initial cast ingot is more than 1200mm, the surface of the initial cast ingot is turned to remove oxide skin, and key process equipment in the test is an extrusion die.
The specific implementation steps are as follows:
step one, carrying out homogenization treatment on the spray-formed round ingot at the temperature of 450 ℃ and 470 ℃, wherein the heat preservation time is 8 h;
step two, rapidly reducing the temperature of the ingot blank to 380-;
step three, closing the die, setting the extrusion speed to be 0.3-0.5mm/s, and upsetting the blank in the die by using a push rod;
and step four, further increasing the pressure to enable the aluminum alloy to fill the die, extruding the aluminum alloy from the die to obtain the high-strength aluminum alloy ribbed wallboard, and rapidly cooling the section to the room temperature through air cooling of the extruded wallboard.
And step five, carrying out aging treatment on the extruded and molded ribbed wallboard, wherein the aging temperature is 110-120 ℃, the heat preservation time is 24h, and the air cooling and temperature reduction are immediately carried out, and the time for cooling to the room temperature is not more than 3 min.
And step six, carrying out aging treatment on the ribbed wallboard, wherein the aging temperature is 110-.
Example 2:
test materials: spray forming was selected to produce a nominal composition Al-8.2Zn-2.1Mg-1.9Cu-0.15Zr (wt.%) aluminum alloy. The diameter of the initial cast ingot is 600mm, the length of the initial cast ingot is more than 1200mm, the surface of the initial cast ingot is turned to remove oxide skin, and key process equipment in the test is an extrusion die.
In the second step, the extrusion speed was set to 0.2 to 0.4mm/s, and the rest was the same as in example 1.
Example 3:
test materials: spray forming was selected to produce a nominal composition Al-8.2Zn-2.1Mg-1.9Cu-0.15Zr (wt.%) aluminum alloy. The diameter of the initial cast ingot is 600mm, the length of the initial cast ingot is more than 1200mm, the surface of the initial cast ingot is turned to remove oxide skin, and key process equipment in the test is an extrusion die.
In the fifth step, carrying out aging treatment on the ribbed wallboard, wherein the temperature is 110-; the temperature is 170-190 ℃, the heat preservation time is 10-60 min, the temperature is 110-120 ℃, and the heat preservation time is 12-24 h. The rest is the same as in example 1.
Example 4:
the test material was selected for spray forming to produce a nominal composition Al-11.5Zn-2.5Mg-1.1Cu-0.15Zr (wt.%) aluminum alloy. The rest of the procedure was the same as in example 1.
Example 5:
the test material was selected for spray forming to produce a nominal composition Al-11.5Zn-2.5Mg-1.1Cu-0.15Zr (wt.%) aluminum alloy. The rest of the procedure was the same as in example 2.
Example 6:
the test material was selected for spray forming to produce a nominal composition Al-11.5Zn-2.5Mg-1.1Cu-0.15Zr (wt.%) aluminum alloy. The rest of the procedure was the same as in example 3.
Example 7:
the test material was selected for spray forming to produce a nominal composition Al-9.5Zn-2.2Mg-1.4Cu-0.15Zr (wt.%) aluminum alloy. The rest of the procedure was the same as in example 1.
Example 8:
the test material was selected for spray forming to produce a nominal composition Al-9.5Zn-2.2Mg-1.4Cu-0.15Zr (wt.%) aluminum alloy. The rest of the procedure was the same as in example 2.
Example 9:
the test material was selected for spray forming to produce a nominal composition Al-9.5Zn-2.2Mg-1.4Cu-0.15Zr (wt.%) aluminum alloy. The rest of the procedure was the same as in example 3.
It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. For embodiments of the method, reference is made to the description of the apparatus embodiments in part. The present invention is not limited to the specific steps and structures described above and shown in the drawings. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.
The above description is only an example of the present application and is not limited to the present application. Various modifications and alterations to this application will become apparent to those skilled in the art without departing from the scope of this invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (10)
1. The extrusion forming method of the wide-width ribbed thin-wall plate is characterized in that the wide-width ribbed thin-wall plate is extruded by adopting an ultrahigh-strength aluminum alloy material, and the extrusion forming method comprises the following steps:
step S10, preparing a preset round ingot blank by adopting a spray forming technology, turning the preset round ingot blank to remove oxide skin, and then carrying out homogenization treatment;
step S11, cooling the homogenized preset round ingot blank to the required extrusion temperature, and respectively heating the die and the extrusion container to respective specified temperatures;
step S12, loading the cooled preset round ingot blank and the heated mould into the heated extrusion barrel for matched die extrusion so as to extrude the blank from the mould to form a wide-width ribbed thin-walled plate;
and step S13, sending the wide thin-walled plate with the ribs into an aging furnace for aging and heat preservation, cooling to room temperature by air cooling, and performing aging and heat preservation again.
2. The method for extrusion molding of a wide ribbed thin-walled sheet as claimed in claim 1, wherein said step S12 specifically includes:
placing the cooled preset round ingot blank and the heated mould into a heated extrusion container;
setting the extrusion speed of an extrusion cylinder, and upsetting a preset round ingot blank in a die by using a push rod in the extrusion cylinder;
and increasing the extrusion force of the extrusion cylinder so that the die is filled with the thickened preset round ingot blank, and then the thickened preset round ingot blank is extruded from the die to form the wide ribbed thin-wall plate.
3. The extrusion-molding method of a wide-width ribbed thin-walled sheet as claimed in claim 1, wherein after said step S12, the extrusion-molding method further comprises:
and (3) feeding the wide ribbed thin-wall plate into an aging furnace for carrying out tertiary aging and heat preservation treatment.
4. The extrusion forming method of a wide-width ribbed thin-walled plate as claimed in claim 1, wherein the diameter of the preliminary round ingot blank is not less than 600mm and the length is not less than 1200 mm.
5. The extrusion forming method of a wide-width ribbed thin-walled plate according to claim 1, wherein the composition of the predetermined round ingot blank comprises the following components: al, Zn, Mg, Cu and Zr, wherein the weight ratio of Zn is 8.2%, the weight ratio of Mg is 2.1%, the weight ratio of Cu is 1.9% and the weight ratio of Zr is 0.15%.
6. The extrusion molding method of a wide ribbed thin-walled plate as claimed in claim 1, wherein in step S10, the temperature of the homogenization treatment is 450-.
7. The method as claimed in claim 1, wherein the extrusion temperature is 380-450 ℃, the temperature of the die is 330-380 ℃, and the temperature of the extrusion cylinder is 350-380 ℃.
8. The method of claim 2, wherein the extrusion speed of the extrusion cylinder is 0.3 to 0.5 mm/s.
9. The extrusion molding method of claim 1, wherein the aging temperature for the first aging and heat preservation treatment is 110-.
10. The extrusion molding method for the wide-width ribbed thin-wall plate as claimed in claim 3, wherein the aging temperature for the first aging and heat-preserving treatment is 110-.
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| CN114309108A (en) * | 2021-12-09 | 2022-04-12 | 山东兖矿轻合金有限公司 | Extrusion forming method of oversized aluminum alloy integral wallboard for ships |
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| 王祖唐等: "挤压硬铝时工艺条件对制品强度和粗晶环厚度的影响", 《清华大学学报(自然科学版)》 * |
| 韩小磊等: "双级时效制度对7150铝合金微观组织和性能的影响 ", 《稀有金属》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114309108A (en) * | 2021-12-09 | 2022-04-12 | 山东兖矿轻合金有限公司 | Extrusion forming method of oversized aluminum alloy integral wallboard for ships |
| CN114309108B (en) * | 2021-12-09 | 2024-05-07 | 山东兖矿轻合金有限公司 | Extrusion molding method of ultra-large aluminum alloy integral wall plate for ship |
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| CN111299347B (en) | 2022-10-18 |
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