CN117140087A - Thin-wall wide-width ribbed arc-shaped skin and preparation method thereof - Google Patents
Thin-wall wide-width ribbed arc-shaped skin and preparation method thereof Download PDFInfo
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- CN117140087A CN117140087A CN202311106681.5A CN202311106681A CN117140087A CN 117140087 A CN117140087 A CN 117140087A CN 202311106681 A CN202311106681 A CN 202311106681A CN 117140087 A CN117140087 A CN 117140087A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 28
- 238000001125 extrusion Methods 0.000 claims abstract description 105
- 238000012545 processing Methods 0.000 claims abstract description 9
- 238000010791 quenching Methods 0.000 claims abstract description 8
- 230000000171 quenching effect Effects 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 22
- 238000004519 manufacturing process Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 11
- 238000001816 cooling Methods 0.000 claims description 10
- 229910001234 light alloy Inorganic materials 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 229910000861 Mg alloy Inorganic materials 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 description 9
- 239000002184 metal Substances 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 7
- 238000003754 machining Methods 0.000 description 7
- 230000007704 transition Effects 0.000 description 7
- 239000002994 raw material Substances 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 4
- 238000003698 laser cutting Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 238000007731 hot pressing Methods 0.000 description 2
- 229910001094 6061 aluminium alloy Inorganic materials 0.000 description 1
- 229910001148 Al-Li alloy Inorganic materials 0.000 description 1
- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical compound [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000001989 lithium alloy Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D17/00—Forming single grooves in sheet metal or tubular or hollow articles
- B21D17/02—Forming single grooves in sheet metal or tubular or hollow articles by pressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D21/00—Combined processes according to methods covered by groups B21D1/00 - B21D19/00
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D37/00—Tools as parts of machines covered by this subclass
- B21D37/16—Heating or cooling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D5/00—Bending sheet metal along straight lines, e.g. to form simple curves
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Abstract
The application relates to a thin-wall wide-width ribbed arc skin and a preparation method thereof, and belongs to the technical field of special forming of large-sized lightweight structures. The preparation method of the thin-wall wide-width ribbed arc skin comprises the following steps of S1: extruding the pipe to form, and carrying out online quenching and stretching straightening to obtain a ribbed pipe; s2: processing an opening on the ribbed pipe along the extrusion direction; s3: flattening the opened ribbed tube to prepare a planar ribbed skin blank; s4: and (3) forming or hot-press forming the planar ribbed skin blank to obtain the ribbed arc skin. The preparation method can obtain the integrally formed ribbed arc skin, the width-thickness ratio is more than or equal to 350, the width is more than or equal to 1200mm, the ribbed arc skin has good formability and complete structure.
Description
Technical Field
The application relates to the technical field of special forming of large-sized lightweight structures, in particular to a thin-wall wide-width ribbed arc skin and a preparation method thereof.
Background
In recent years, the thin-wall wide-width ribbed arc skin is widely applied in the industries of aerospace, rail transit, petrochemical industry and the like so as to meet the requirements of increasingly severe light weight and integrated manufacturing of part structures.
At present, for skin or panel structures with narrower breadth, an extrusion process is mainly adopted to directly extrude a profile product. However, the method of extruding a profile is difficult to realize once forming because of the diameter of an extrusion cylinder, the extrusion ratio and the tonnage of an extruder for a wide thin-wall skin. The prior wide thin-wall skin structure is prepared by splicing welding of multiple narrow skins or machining by thick plates. However, the strength of the welding seam of the narrow-width skin formed by welding the narrow-width skin cannot meet the requirements of severe service environment; the material utilization rate of the thick plate machining method is extremely low; and because the mechanical processing deformation is large due to thinner wall thickness, the processing gap is often required to be subjected to shape correction and annealing treatment, and then the processing is continued, so that the whole processing period is long and the production efficiency is low.
Therefore, a preparation method is needed to obtain the integrally formed thin-wall wide-width ribbed arc skin.
Disclosure of Invention
In view of the above analysis, the present application aims to provide a thin-wall wide-width ribbed arc skin and a preparation method thereof, which can obtain an integrally formed thin-wall wide-width ribbed arc skin.
On one hand, the application provides a preparation method of a thin-wall wide-width ribbed arc skin, which comprises the following steps:
s1: extruding and forming the pipe or bar, and carrying out online quenching and stretching straightening to obtain a ribbed pipe;
s2: processing an opening on the ribbed pipe along the extrusion direction;
s3: flattening the opened ribbed tube to prepare a planar ribbed skin blank;
s4: and (3) forming or hot-press forming the planar ribbed skin blank to obtain the ribbed arc skin.
Further, the ribbed pipe is provided with a plurality of ribs along the extrusion direction, and the ribs are arranged on the outer wall or the inner wall of the ribbed pipe.
Further, in extrusion molding, the pipe is preheated at a preheating temperature of 400-450 ℃ and an extrusion temperature of 400-450 ℃.
Further, in the extrusion molding, the extrusion speed is 0.3 to 0.8mm/s.
Further, the online quenching adopts a cooling mode of air cooling, water cooling or fog cooling.
Further, the ribbed arc skin is provided with a plurality of ribs, and the ribs are positioned on the concave side or the convex side of the ribbed arc skin.
Further, the ribbed arc skin is made of light alloy.
Still further, the light alloy is an aluminum alloy or a magnesium alloy.
Further, the hot press forming temperature is 200-500 ℃, and the pressure is 20-200 tons.
On the other hand, the application provides a thin-wall wide-width ribbed arc-shaped skin, which is obtained by the preparation method.
Further, the width-thickness ratio of the thin-wall wide-width ribbed arc skin is more than or equal to 350, and the width is more than or equal to 1200mm.
Compared with the prior art, the application has at least one of the following beneficial effects:
1. the preparation method of the ribbed arc skin comprises the steps of firstly extruding a pipe to obtain a ribbed pipe, then opening the ribbed pipe along the extrusion direction, then flattening the ribbed pipe, and finally preparing the skin with a certain radian by sheet metal forming or hot press forming. The preparation method can obtain the integrally formed ribbed arc skin, the width-thickness ratio is more than or equal to 350, and the width is more than or equal to 1200mm.
2. By extrusion forming, two types of ribbed pipes can be prepared, wherein one type of ribbed pipe is formed by arranging ribs on the outer wall of the pipe, and the other type of ribbed pipe is formed by arranging ribs on the inner wall of the pipe along the extrusion direction of the pipe.
3. In the extrusion forming process, the extrusion speed is controlled, the pipe is preheated, and the obtained ribbed pipe is good in formability and complete in structure.
4. According to the preparation method provided by the application, the thin-wall wide-width ribbed arc-shaped skin with two specifications can be obtained, wherein one rib is positioned on the concave side of the arc-shaped skin, the other rib is positioned on the convex side of the arc-shaped skin, and the ribs are arranged along the length direction of the arc-shaped skin.
In the application, the technical schemes can be mutually combined to realize more preferable combination schemes. Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application may be realized and attained by the structure particularly pointed out in the written description and drawings.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the application, like reference numerals being used to refer to like parts throughout the several views.
FIG. 1 is a schematic view of a pipe with ribs on the outside;
FIG. 2 is a schematic view of a flattened planar thin-walled wide-web skin;
FIG. 3 is a schematic view of a thin-walled wide skin with ribs on the convex side of the arc;
FIG. 4 is a schematic view of a tube with ribs on the inside;
FIG. 5 is a schematic view of a thin-walled wide skin with ribs on the concave side of an arc;
FIG. 6 is a schematic view of the placement position of the raw material pipe;
FIG. 7 is a physical view of an extrusion die;
FIG. 8 is a schematic view of a squeeze needle;
FIG. 9 is a schematic view of a mold during flattening, sheet metal forming or hot press forming;
in the figure 1, an extrusion shaft; 2. a squeeze pad; 3. an extrusion cylinder; 4. an extrusion die; 5. a pipe; 6. a ribbed pipe; 7. the needle is pressed.
Detailed Description
The following detailed description of preferred embodiments of the application is made in connection with the accompanying drawings, which form a part hereof, and together with the description of the embodiments of the application, are used to explain the principles of the application and are not intended to limit the scope of the application.
Currently, skin is produced mainly by extrusion. However, as the skin advances to larger sizes, existing extrusion equipment cannot prepare a wide thin-wall skin, so it is conceivable to connect narrow thin-wall skins by using a welding technique; but the skin of the welded connection does not meet the more severe environmental requirements. And further, the thick plate is machined by a machining method, but the thin-wall skin is found to be deformed in the preparation process, and the whole machining period is longer.
Therefore, the application provides a preparation method, which can prepare the integrally formed wide thin-wall skin, is simpler and is easy to control, and comprises the following steps:
s1: extruding and forming the pipe or bar, and carrying out online quenching and stretching straightening to obtain a ribbed pipe;
s2: processing an opening on the ribbed pipe along the extrusion direction;
s3: flattening the opened ribbed tube to prepare a planar ribbed skin blank;
s4: and (3) forming or hot-press forming the planar ribbed skin blank to obtain the ribbed arc skin.
Compared with the prior art, the application provides a preparation method of a thin-wall wide skin, which comprises the steps of firstly preparing a pipe into a ribbed pipe by using an extrusion forming method, then opening the ribbed pipe along the extrusion direction, flattening the opened ribbed pipe, and finally preparing the integrally formed wide thin-wall skin by using sheet metal forming or hot press forming. The preparation method provided by the application can prepare the thin-wall wide-width ribbed arc skin with the width more than or equal to 1200mm and the width-thickness ratio more than or equal to 350, and has the advantages of shorter processing period, higher production efficiency and higher precision.
Preparation before extrusion: and calculating the diameter, wall thickness and other controllable dimensions of the ribbed pipe according to the parameters of the thin-wall wide ribbed skin, such as thickness, width, rib height, rib spacing and the like. The thickness of the thin-wall wide-width ribbed skin is equal to the wall thickness of the ribbed pipe, and the thickness is not changed in the extrusion and subsequent preparation processes; parameters such as rib height, rib spacing and the like of the thin-wall wide-width rib skin can be correspondingly adjusted through the extrusion die; while the width (arc length) L of the thin-wall wide-width ribbed skin passes through the formula l=circle Zhou Chang × And D, calculating, wherein D is the diameter of the ribbed pipe.
According to the calculation result, the pipe is placed on a vertical extruder or a horizontal extruder for extrusion forming, and the integral formability and performance of the ribbed pipe are ensured by controlling parameters such as extrusion speed, preheating temperature of the pipe and the like.
Specifically, in extrusion molding, the pipe is preheated at 400-450 ℃ and at 400-450 ℃.
In the extrusion forming process, the extrusion temperature is controlled within the range of 400-450 ℃, so that the smooth extrusion process and the defect-free surface of the reinforced pipe can be ensured. When the extrusion temperature is too high, the ribbed pipe is overheated or even over-burned, and the quality of the ribbed pipe and the final skin is seriously affected; meanwhile, the too high extrusion temperature can increase the viscosity of metal, so that the surface of the reinforced pipe is not smooth, and defects such as pitted surface, scratch and the like appear, thereby influencing the forming precision; when the extrusion temperature is too low, the plasticity of the pipe is deteriorated, the deformation resistance is increased, the extrusion force is increased, and meanwhile, the extrusion die is easily damaged due to the too low extrusion temperature, so that the precision and the formability of the ribbed pipe are affected.
Specifically, in extrusion molding, the extrusion speed is 0.3 to 0.8mm/s 。
In the extrusion process, the dimensional accuracy and performance of the ribbed pipe are ensured by reasonably controlling the preheating temperature and the extrusion speed. When the extrusion speed is smaller, the preheating temperature must be increased, but the higher preheating temperature causes the ribbed tube to have an overburden structure, thereby reducing the performance of the final skin. When the extrusion speed is large, the preheating temperature must be reduced, but when the preheating temperature is too low, the formability of the ribbed pipe cannot be ensured, and the dimensional accuracy cannot be ensured.
Specifically, the online quenching can adopt an air cooling, water cooling or fog cooling mode.
In the application, the pipe is directly quenched on line after extrusion, the temperature of the pipe can reach above 480 ℃ after extrusion forming, and the pipe is directly cooled without being heated again, thereby saving energy. After quenching, the structure of the obtained ribbed pipe can be ensured to be more uniform, and the problem of collapse in the preparation process is prevented, so that the formability of the final skin is ensured.
Referring to fig. 6, in the extrusion process, a raw material pipe 5 is placed in an extrusion cylinder 3 with a hollow interior in an extruder, an extrusion die 4 is connected to one end of the extrusion cylinder 3, and the extrusion die 4 is a cylinder with a rib groove and a hollow interior. One end of the raw material pipe 5 is abutted against the extrusion die 4, the extrusion pad 2 is arranged at the other end of the raw material pipe 5, the extrusion needle 7 penetrates through the extrusion pad 2 and extends into the extrusion die 4 all the time, one end, far away from the extrusion die 4, of the extrusion needle 7 is connected with the extrusion shaft 1, and the extrusion shaft 1 is located on one side, far away from the raw material pipe 5, of the extrusion pad 2.
The extrusion shaft 1 drives the extrusion pad 2 and the extrusion needle 7 to move towards one side of the extrusion die 4 at the same time, the extrusion pad 2 pushes the raw material pipe 5 to extrude the extrusion die 4, and the ribbed pipe 6 is obtained under the combined action of the extrusion needle 7 and the extrusion die 4.
Specifically, referring to fig. 7, the extrusion die 4 is a cylinder, a circular hole is formed in the center, and a plurality of rib grooves are formed in the circumferential surface of the circular hole, so that ribs on the pipe 5 can be formed, the number and the specification of the rib grooves are the same as those of the ribs, the rib grooves can be set according to actual needs, the width of the rib grooves along the extrusion direction is gradually narrowed, the pipe 5 can flow in the rib grooves conveniently, and the forming is facilitated.
Specifically, referring to fig. 8, the extrusion needle 7 is a cylinder, and functions to form in cooperation with the extrusion die 4 and to support the extruded ribbed tube 6. The thickness of the resulting ribbed tube 6 or skin is determined by the gap between the extrusion pin 7 and the extrusion die 4, and by varying the diameter of the circular hole in the extrusion pin 7 or extrusion die 4, ribbed tube 6 or skin of different thickness is obtained. The extrusion needle 7 is integrally formed and consists of a front section, a transition section and a forming section, wherein the front section and the forming section are both cylinders, and the diameter of the front section is smaller than that of the forming section; the transition section is in a truncated cone shape and is positioned between the front section and the forming section, the small end of the transition section is fixedly connected with the front section, the large end of the transition section is fixedly connected with the forming section, and one end of the forming section, which is far away from the transition section, is fixedly connected with the extrusion shaft 1. The front section mainly has guiding function, the transition section mainly has transition function, the metal flow speed is balanced, the extrusion force is reduced, and the forming section mainly has forming and supporting functions by matching with the extrusion die 4.
Specifically, the ribbed pipe is provided with a plurality of ribs along the extrusion direction, and the ribs are arranged on the outer wall or the inner wall of the ribbed pipe.
And extruding and forming the pipe on an extruder to obtain the ribbed pipe, wherein the ribs can be arranged on the outer wall of the ribbed pipe or the inner wall of the ribbed pipe through corresponding extruding dies. The ribs are arranged along the extrusion direction of the pipe, and the number and the shape of the ribs can be correspondingly arranged according to actual needs.
Specifically, the machining mode of the opening of the ribbed pipe can adopt laser cutting, water cutting or electric spark machining.
Cutting openings are formed in the ribbed pipe, so that the ribbed pipe can be flattened in the later period, and the skin is prepared.
Specifically, the flattening device needs to be special flattening device designed and manufactured according to the shape of the skin structure or a roller flattening machine provided with a special flattening tool.
In the step S4, sheet metal forming can be adopted, and hot press forming can also be adopted to prepare the flat ribbed skin blank into the ribbed arc skin.
Specifically, the sheet metal forming is used for forming the flat strip skin blank into a required arc-shaped structure through an oil press and a die.
Specifically, the hot press forming utilizes a hot press and a die to form the flat strip skin blank under certain temperature and pressure conditions.
Referring to fig. 9, the tool is formed using a die during the flattening process, sheet metal forming, or hot press forming. The die comprises an upper die and a lower die, wherein the upper die is provided with triangular bulges, the tips of the bulges are of round corner structures, grooves into which the bulges of the upper die are inserted are formed in the lower die, and the bulges are matched with the grooves. And rolling and flattening the ribbed skin by using the die closing movement of the upper die and the lower die and adopting a progressive shape correction method. The ribbed skin with different curvatures can be obtained by changing the size of the fillets in the protrusions and the grooves.
Specifically, the hot press forming temperature is 200-500 ℃, and the pressure is 20-200 tons.
Specifically, the ribbed arc skin is made of light alloy.
Preferably, the light alloy is an aluminum alloy or a magnesium alloy.
In order to more clearly describe the present application, example 1 is further illustrated by the following examples and comparative examples
The preparation of the thin-wall wide-width ribbed arc skin comprises the following steps:
preparation before extrusion: the thickness of the skin prepared by the embodiment is 2.5mm, the arc length is 1413.72mm, 4 ribs are arranged on the convex side of the skin, the height of the ribs is 30mm, and the interval between the ribs is 353.43mm; the diameter of the ribbed pipe is 450mm, the wall thickness is 2.5mm, the length is 1000mm, the material is 6061 aluminum alloy, and the ribs are arranged on the outer wall of the ribbed pipe.
Step S1: placing the pipe on a 5000-ton horizontal extruder for extrusion forming to obtain a ribbed pipe, and referring to FIG. 1, uniformly arranging ribs on the outer wall of the ribbed pipe;
wherein, the preheating temperature of the pipe is 400 ℃, the extrusion temperature is 420 ℃, and the extrusion speed is 0.8mm/s;
the structure of the specific extrusion process, extrusion needle and extrusion die is shown in fig. 6, 7 and 8;
step S2: cutting the ribbed pipe by using laser cutting to form an opening;
step S3: placing the opened ribbed tube on a roller flattening machine for flattening to obtain a flat ribbed skin blank (refer to figure 2);
step S4: sheet metal forming is carried out on the flat strip rib skin blank by using a 400-ton oil press and a die to obtain a strip rib arc skin, and referring to FIG. 3, ribs are arranged on the convex side of the arc skin;
wherein the forming temperature is room temperature, and the pressure of the oil press is 200t; wherein the structure of the mold is shown in fig. 9.
Example 2
The preparation of the thin-wall wide-width ribbed arc skin comprises the following steps:
preparation before extrusion: the thickness of the skin prepared by the embodiment is 5mm, the arc length is 1570.8mm, 4 ribs are arranged on the concave side of the skin, the height of the ribs is 35mm, and the rib interval is 392.7mm; the diameter of the ribbed pipe is 500mm, the wall thickness is 5mm, the length is 1535mm, the material is 2195 aluminum lithium alloy, and the ribs are arranged on the inner wall of the ribbed pipe.
Step S1: placing the pipe on a 6000-ton vertical extruder for extrusion forming to obtain a ribbed pipe, and uniformly arranging ribs on the inner wall of the ribbed pipe according to FIG. 4;
wherein, the preheating temperature of the pipe is 430 ℃, the extrusion temperature is 450 ℃, and the extrusion speed is 0.3mm/s;
the structure of the specific extrusion process, extrusion needle and extrusion die are the same as in example 1, with corresponding changes in specific dimensions;
step S2: cutting the ribbed pipe by using laser cutting to form an opening;
step S3: placing the opened ribbed tube on a roller flattening machine for flattening to obtain a flat ribbed skin blank (refer to figure 2);
step S4: carrying out hot press forming on the flat strip rib skin blank by using a 2000-ton press and a die to obtain a strip rib arc skin, wherein ribs are arranged on the concave side of the arc skin with reference to FIG. 5;
wherein the hot pressing temperature is 450 ℃ and the pressure is 50t.
Example 3
Example 3 was substantially identical to the preparation process of example 1, except that the pipe material in example 3 was preheated at 400℃and extruded at 430℃and at an extrusion speed of 0.5mm/s.
Example 4
Example 4 was substantially identical to the preparation process of example 1, except that the pipe material in example 4 was preheated at 410℃and extruded at 420℃and at an extrusion speed of 0.7mm/s.
Example 5
Example 5 was prepared in substantially the same manner as in example 2, except that the hot-pressing temperature in example 5 was 300℃and the pressure was 80t.
Comparative example 1
The specific welding and splicing process comprises the following steps: extruding a ribbed flat plate with a narrow width, wherein the thickness is 4mm, the width is 600mm, the length is 1000mm, and then butting and splice-welding 3 ribbed flat plates to obtain a wide ribbed flat plate with the width of 1800 mm.
Comparative example 2
The ribbed skin is prepared on the thick plate in a machining mode, the thickness of the skin is 2.5mm, the arc length is 1413.72mm, 4 ribs are arranged on the convex side of the skin, the height of each rib is 30mm, and the rib spacing is 353.43mm.
Effect verification
Performance tests were performed on examples 1-5 and comparative examples 1-2 above, mainly including dimensional accuracy and single piece production cycle, and specific results are shown in tables 1 and 2.
TABLE 1 detection results
| Group of | Contour accuracy/mm | Production cycle (piece/h) |
| Standard requirements | ±0.3 | - |
| Example 1 | ±0.3 | 8 |
| Example 2 | ±0.3 | 8 |
| Example 3 | ±0.28 | 8 |
| Example 4 | ±0.20 | 8 |
| Example 5 | ±0.25 | 8 |
| Comparative example 1 | ±1.0 | 16 |
| Comparative example 2 | ±0.8 | 84 |
Referring to examples 1-5 and comparative examples 1-2 in combination with Table 1, it can be seen that, when the preparation method of examples 1-5 of the present application is adopted, the obtained wide thin-walled skin is integrally formed, and the contour accuracy is high, so that the standard requirements can be satisfied, the whole production period is short, and the production efficiency is high.
The present application is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present application are intended to be included in the scope of the present application.
Claims (10)
1. The preparation method of the thin-wall wide-width ribbed arc skin is characterized by comprising the following steps of:
s1: extruding and forming the pipe or bar, and carrying out online quenching and stretching straightening to obtain a ribbed pipe;
s2: processing an opening on the ribbed pipe along the extrusion direction;
s3: flattening the opened ribbed tube to prepare a planar ribbed skin blank;
s4: and (3) forming or hot-press forming the planar ribbed skin blank to obtain the ribbed arc skin.
2. The method for manufacturing a thin-wall wide ribbed arc skin according to claim 1, characterized in that the ribbed tube is provided with a plurality of ribs along the extrusion direction, the ribs being provided on the outer wall or the inner wall of the ribbed tube.
3. The method for producing a thin-walled, wide-format ribbed, arcuate skin in accordance with claim 1, characterized in that the tubing is preheated during extrusion at a temperature of 400-450 ℃ and at a temperature of 400-450 ℃.
4. The method for producing a thin-walled, wide-web, ribbed, curved skin according to claim 1, characterized in that in the extrusion, the extrusion speed is 0.3-0.8mm/s.
5. The method for preparing the thin-wall wide-width ribbed arc skin according to claim 1, wherein the online quenching adopts an air cooling, water cooling or fog cooling mode.
6. The method for manufacturing a thin-walled wide ribbed curved skin according to claim 1, characterized in that the ribbed curved skin is provided with a plurality of ribs, which are located on the concave side or the convex side of the ribbed curved skin.
7. The method for preparing the thin-wall wide-width ribbed arc skin according to claim 1, wherein the ribbed arc skin is made of light alloy;
preferably, the light alloy is an aluminum alloy or a magnesium alloy.
8. The method for manufacturing the thin-wall wide-width ribbed arc skin according to claim 1, wherein the hot press forming temperature is 200-500 ℃ and the pressure is 20-200 tons.
9. A thin-walled wide ribbed arcuate skin obtainable by the process of any of claims 1 to 8.
10. The thin-walled wide ribbed cambered skin of claim 9, wherein the thin-walled wide ribbed cambered skin has a width to thickness ratio of greater than or equal to 350 and a width of greater than or equal to 1200mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311106681.5A CN117140087A (en) | 2023-08-30 | 2023-08-30 | Thin-wall wide-width ribbed arc-shaped skin and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311106681.5A CN117140087A (en) | 2023-08-30 | 2023-08-30 | Thin-wall wide-width ribbed arc-shaped skin and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117140087A true CN117140087A (en) | 2023-12-01 |
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| CN202311106681.5A Pending CN117140087A (en) | 2023-08-30 | 2023-08-30 | Thin-wall wide-width ribbed arc-shaped skin and preparation method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN117140087A (en) |
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2023
- 2023-08-30 CN CN202311106681.5A patent/CN117140087A/en active Pending
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