CN117165814A - 5-meter-level special-shaped ring and preparation method thereof - Google Patents
5-meter-level special-shaped ring and preparation method thereof Download PDFInfo
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- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 229910001148 Al-Li alloy Inorganic materials 0.000 claims abstract description 27
- JFBZPFYRPYOZCQ-UHFFFAOYSA-N [Li].[Al] Chemical compound [Li].[Al] JFBZPFYRPYOZCQ-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000001989 lithium alloy Substances 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000005096 rolling process Methods 0.000 claims description 43
- 238000003754 machining Methods 0.000 claims description 28
- 238000010438 heat treatment Methods 0.000 claims description 23
- 230000032683 aging Effects 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 238000004080 punching Methods 0.000 claims description 9
- 238000010791 quenching Methods 0.000 claims description 9
- 230000000171 quenching effect Effects 0.000 claims description 9
- 238000012545 processing Methods 0.000 claims description 5
- 230000009467 reduction Effects 0.000 claims description 4
- 238000005242 forging Methods 0.000 description 24
- 238000004321 preservation Methods 0.000 description 6
- 238000005266 casting Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000011534 incubation Methods 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Abstract
The application relates to the technical field of ring piece preparation, in particular to a 5-meter-level special-shaped ring and a preparation method thereof. The application provides a 5-meter-class special-shaped ring and a preparation method thereof. The 5-meter-level special-shaped ring provided by the application is an aluminum lithium alloy special-shaped ring, and the outer diameter is 5000-5500 mm; the tangential tensile strength is 485-587 MPa, the tangential yield strength is 408-536 MPa, and the tangential elongation is 5-13%; the axial tensile strength is 485-551 MPa, the axial yield strength is 395-389 MPa, and the axial elongation is 5-8%; the radial tensile strength is 493-552 MPa, the yield strength is 440-503 MPa, and the elongation is 3-6%. The method provided by the application can be used for preparing the 5-meter-class special-shaped ring, and has large size and high three-dimensional mechanical property.
Description
Technical Field
The application relates to the technical field of ring piece preparation, in particular to a 5-meter-level special-shaped ring and a preparation method thereof.
Background
The ring piece comprises a ring piece and a special-shaped ring piece, the large ring piece is one of key connecting components of a plurality of large aerospace craft, the larger the manufacturing size of the ring piece, the higher the process required by the larger the manufacturing size of the ring piece, the large ring piece is developed in China at present, but the large special-shaped ring piece is still blank in domestic research. The manufacturing of large-scale special-shaped ring piece is higher than the large-scale ring piece in technological requirement, and the performance and the size of the special-shaped ring piece developed before do not reach the size and the performance condition that the patent relates to. There is a need to develop high performance stable large sized shaped ring members.
Disclosure of Invention
In view of the above, the technical problem to be solved by the application is to provide a 5-meter-class special-shaped ring and a preparation method thereof, and the method provided by the application can be used for preparing the 5-meter-class special-shaped ring, and has large size and high three-dimensional mechanical property.
The application provides a 5-meter-level special-shaped ring which is an aluminum-lithium alloy special-shaped ring, wherein the outer diameter is 5000-5500 mm; the tangential tensile strength is 485-587 MPa, the tangential yield strength is 408-536 MPa, and the tangential elongation is 5-13%; the axial tensile strength is 485-551 MPa, the axial yield strength is 395-511 MPa, and the axial elongation is 5-8%; the radial tensile strength is 490-552 MPa, the yield strength is 435-503 MPa, and the elongation is 3-6%.
The tangential tensile strength of the 5-meter-class special-shaped ring is preferably not less than 530MPa; the tangential yield strength is preferably not less than 500MPa; the tangential elongation is preferably not less than 6%; the axial tensile strength is preferably not less than 510MPa; the axial yield strength is preferably not less than 470MPa; the axial elongation is preferably not less than 5%; the radial tensile strength is preferably not less than 490MPa; the radial yield strength is preferably not less than 435MPa; the radial elongation is not less than 4%.
In certain embodiments of the application, the tangential tensile strength of the 5 m-level profiled ring of the application is 560-587 MPa; the tangential yield strength is 513-536 MPa; the tangential elongation is 7-8%; the axial tensile strength is 539-551 MPa; the axial yield strength is 474-489 MPa; the axial elongation is 5%; the radial tensile strength is 514-552 MPa; radial yield strength is 486-503 MPa; the radial elongation is 4-6%.
The 5-meter-level special-shaped ring is an aluminum-lithium alloy special-shaped ring; specifically, the composition thereof comprises: less than 0.08wt% of Si, less than 0.10wt% of Fe, 3.8wt% to 4.2wt% of Cu, 0.8wt% to 1.3wt% of Li, 0.25wt% to 0.7wt% of Mg, 0.25wt% to 0.5wt% of Ag, 0.08wt% to 0.16wt% of Zr, less than 0.1wt% of Ti, and the balance of Al. In one embodiment, the composition of the 5m grade profiled ring comprises: 0.05wt% Si, 0.04wt% Fe, 3.9wt% Cu, 1.0wt% Li, 0.45wt% Mg, 0.3wt% Ag, 0.13wt% Zr and 0.07wt% Ti, the balance being Al. In one embodiment, the composition of the 5m grade profiled ring comprises: 0.03wt% Si, 0.04wt% Fe, 3.9wt% Cu, 1.1wt% Li, 0.5wt% Mg, 0.4wt% Ag, 0.11wt% Zr and 0.03wt% Ti, the balance being Al.
The outer diameter of the 5-meter-class special-shaped ring is 5000-5500 mm; specifically, the height is 500 to 700mm. More specifically, it consists of a thick-wall hole end portion having a wall thickness of 80 to 200mm, a thin-wall hole end portion having a wall thickness of 50 to 120mm, and a ring middle portion having a wall thickness of 50 to 80mm; the radius of the circular arc between the end part of the thick-wall hole and the longitudinal section of the middle part of the ring is 100-500 mm, and the taper of the circular arc is 20-40 degrees; the radius of the circular arc between the end part of the thin-wall hole and the longitudinal section of the middle part of the ring is 50-200 mm, and the taper of the circular arc is 50-60 degrees; the vertical thickness of the longitudinal section of the thick-wall hole end part before entering the circular arc section is 30mm, and the vertical thickness of the longitudinal section of the thin-wall hole end part before entering the circular arc section is 40mm.
In one embodiment, the 5-meter-class profiled ring has an outer diameter of 5052+10mm and a height of 610mm, and consists of a thick-wall hole end portion, a thin-wall hole end portion and a ring middle portion, wherein the wall thickness of the thick-wall hole end portion is 180mm, the wall thickness of the thin-wall hole end portion is 105mm, and the wall thickness of the ring middle portion is 65mm; the radius of the circular arc between the end part of the thick-wall hole and the longitudinal section of the middle part of the ring is 300mm, and the taper of the circular arc is 28 degrees; the radius of the circular arc between the end part of the thin-wall hole and the longitudinal section of the middle part of the ring is 100mm, and the taper of the circular arc is 53 degrees; the vertical thickness of the longitudinal section of the thick-wall hole end part before entering the circular arc section is 30mm, and the vertical thickness of the longitudinal section of the thin-wall hole end part before entering the circular arc section is 40mm.
The 5-meter-level special-shaped ring provided by the application is composed of aluminum lithium alloy, is used as a special-shaped ring, has high three-dimensional mechanical property when the size reaches 5 meters, and can meet actual requirements.
The application also provides a preparation method of the 5-meter-class special-shaped ring, which comprises the following steps:
s1) punching and leveling an aluminum-lithium alloy cylindrical ingot with the diameter of 900+/-20 mm and the height of 550+20mm to obtain a ring with the inner diameter of 500mm and the height of 520+10 mm;
s2) after the ring piece obtained in the step S1) is subjected to center hole processing, heating and reaming are carried out, and then rolling and machining are sequentially carried out for a plurality of times, so that a 5-meter-class special-shaped ring piece is obtained;
s3) sequentially carrying out solution quenching for 300-600 min at 480-520 ℃ and cold bulging on the 5-meter-level special-shaped ring piece obtained in the step S2) and aging treatment for 10-45 h at 145-160 ℃ to obtain the 5-meter-level special-shaped ring.
Firstly, punching and leveling an aluminum-lithium alloy cylindrical ingot with the diameter of 900+/-20 mm and the height of 550+20mm to obtain a ring with the inner diameter of 500mm and the height of 520+10 mm. The aluminum-lithium alloy cylindrical ingot is obtained by forging an aluminum-lithium alloy cuboid ingot, the forging temperature is 430-470 ℃, the final forging temperature is more than or equal to 350 ℃, the die use temperature is more than or equal to 280 ℃, and the forging speed is 15mm plus or minus 5/s; before forging, the aluminum-lithium alloy cuboid ingot is heated at the temperature of 460+/-10 ℃ and kept for more than 760 minutes. The composition of the aluminum lithium alloy cuboid cast ingot is similar to that of the 5-meter-class special-shaped ring, and is not repeated.
Specifically, the aluminum-lithium alloy cylindrical ingot casting provided by the application is obtained by the following steps:
a) Upsetting the first end face, the second end face and the third end face of the aluminum lithium alloy cuboid ingot until the heights of the end faces are 820+20mm, and squaring the second end face and the third end face to 730+/-10 mm multiplied by 730+/-10 mm; the first end face is a thick-wide face, the second end face is a thick-long face, and the third end face is a wide-long face;
b) And c), square drawing, rolling and upsetting are carried out on the first end face of the cast ingot obtained in the step a), and an aluminum-lithium alloy cylindrical cast ingot with the diameter of 900+/-20 mm and the height of 550+20mm is obtained.
More specifically, the aluminum-lithium alloy cylinder ingot is obtained by the following steps:
a) Upsetting a first end surface of an aluminum lithium alloy rectangular ingot with the thickness, the width and the length of 1310, 370 and 1800mm to a height of 820+20mm; square drawing the second end surface to a thickness of 730+/-10 mm multiplied by 730+/-10 mm, and upsetting to a height of 820+20mm; square drawing the third end surface to 730+/-10 mm×730+/-10 mm wide and upsetting to 820+20mm high; wherein, after the second end face or the third end face is square-drawn to 730+/-10 mm multiplied by 730+/-10 mm, the height of the end face is naturally drawn to 2000mm;
b) And c) square drawing and rounding the first end face of the cast ingot obtained in the step a) until the diameter is 900+/-20 mm, upsetting until the height of the first end face is 550+20mm, and obtaining the aluminum-lithium alloy cylindrical cast ingot with the diameter of 900+/-20 mm and the height of 550+20 mm.
After the aluminum-lithium alloy cylindrical ingot is obtained, punching and leveling are carried out on the aluminum-lithium alloy cylindrical ingot, so that a ring piece with the inner diameter of 500mm and the height of 520+10mm is obtained. Specifically, the application punches a central hole of the aluminum lithium alloy cylinder cast ingot, the eccentricity is required to be below 20mm during centering, and the punching connecting skin is 100-200 mm. After punching the aluminum lithium alloy cylindrical ingot, the first end face of the punched ingot is leveled to be 520+/-10 mm in height, and a ring piece with the inner diameter of 500mm and the height of 520+10mm is obtained.
After the ring piece with the inner diameter of 500mm and the height of 520+10mm is obtained, the obtained ring piece is subjected to center hole processing, heating reaming and rolling and machining for multiple times sequentially, and the 5-meter-class special-shaped ring piece is obtained. The machining of the center hole requires turning over more than 90% of punching taper.
Before the heating reaming is carried out, the ring piece after the center hole is processed needs to be heated at the temperature of 450-470 ℃, the constant temperature is 460 ℃, and the heat preservation time is at least 520 minutes. The forging temperature of the heating reaming is 430-470 ℃, the reaming finish forging temperature is above 350 ℃, the leveling finish forging temperature is above 350 ℃, and the working temperature and the die use temperature are 250-420 ℃. The heating reaming of the application is specifically as follows: reaming is carried out for 6-7 circles at the temperature of more than or equal to 350 ℃ until the outer diameter of the ring piece after the center hole is machined is 2500+/-50 mm, the reaming reduction of the last circle is not more than 20mm, the reaming reduction of other circles is 40-50 mm, the wall thickness difference is not more than 20mm, and the local bulge is not more than 10mm.
According to the application, after the ring piece with the center hole is heated and reamed, rolling and machining are sequentially carried out for a plurality of times, and a 5-meter-class special-shaped ring piece is obtained. The rolling and the machining are sequentially carried out for a plurality of times, specifically, the first rolling and the first machining are carried out, and then the second rolling and the second machining are carried out. Before the first rolling, the ring piece after the heating and reaming is heated, specifically, the ring piece is heated at the temperature of 460-470 ℃, the temperature is fixed at 460 ℃, and the heat preservation time is at least 300 minutes. The initial rolling temperature of the first rolling is 430-470 ℃, the final rolling temperature is above 350 ℃, and the first rolling is carried out on the ring after reaming sequentially according to the external diameter 2567mm, the wall thickness 258mm, the external diameter 2765mm, the wall thickness 231mm, the external diameter 3095mm, the wall thickness 204mm, the external diameter 3161mm, the wall thickness 199mm, the external diameter 3194mm and the wall thickness 197mm at the temperature of more than or equal to 350 ℃.
The application performs the first machining after the first rolling. The first machining purpose of the application is to machine the ring piece after the first rolling into a prototype of the 5-meter-class special-shaped ring so as to be further processed into a preset 5-meter-class special-shaped ring structure in the subsequent machining.
The application performs the first rolling and the first machining, and then performs the second rolling and the second machining. Before the second rolling, the ring piece after the second machining is heated, specifically, the ring piece is heated at the temperature of 450-470 ℃, the constant temperature is 460 ℃, and the heat preservation time is at least 200 minutes. The initial rolling temperature of the second rolling is 430-470 ℃, the final rolling temperature is above 350 ℃, and the ring piece after the first machining is rolled for the second time sequentially according to the outer diameter 3282mm and the wall thickness 193mm, the outer diameter 3809mm and the wall thickness 162mm, the outer diameter 4687mm and the wall thickness 124mm, the outer diameter 4862mm and the wall thickness 124mm and the outer diameter 4950mm and the wall thickness 121mm at the temperature of more than or equal to 350 ℃.
The second machining purpose of the application is to further machine the ring piece after the first machining into a preset 5-meter-class special-shaped ring structure. In one embodiment, the 5m grade profiled ring piece after the second machining and before solution hardening has an outer diameter of 4950mm and a height of 600-2mm, which consists of a large bore end portion, a small bore end portion and a ring middle portion, wherein the wall thickness of the large bore end portion is 103.5mm, the wall thickness of the small bore end portion is 178.5mm, and the wall thickness of the ring middle portion is 63.5mm; the radius of the circular arc between the longitudinal sections of the end part of the large hole and the middle part of the ring is 100mm, and the taper of the circular arc is 53 degrees; the radius of the circular arc between the small hole end part and the longitudinal section of the middle part of the ring is 300mm, and the taper of the circular arc is 28 degrees; the vertical thickness of the longitudinal section of the big hole end part before entering the circular arc section is 35mm, and the vertical thickness of the longitudinal section of the small hole end part before entering the circular arc section is 30-2mm.
After the second rolling and the second machining are carried out, a 5-meter-class special-shaped ring piece is obtained, and then the obtained 5-meter-class special-shaped ring piece is sequentially subjected to solution quenching at 480-520 ℃ for 300-600 min, cold bulging and aging treatment at 145-160 ℃ for 10-45 h, so that the 5-meter-class special-shaped ring is obtained. In some embodiments of the application, the cold expansion rate of the cold expansion is 3.0-4.0%, and the outer diameter of the control ring after expansion is 5052+10mm.
In certain embodiments of the present application, the solution hardening temperature is preferably 505 ℃ to 515 ℃, and the solution hardening time is preferably 300 to 400min, more preferably 300min; the temperature of the aging treatment is 145-150 ℃, and the time of the aging treatment is 30-45 h.
According to the application, the 5-meter-class special-shaped ring is finally obtained through the preparation method; the morphological structure, composition and performance of the 5-meter-class special-shaped ring are the same as those described above, and are not repeated. Besides the step requirement of forging and cogging the cast ingot, the application combines the conditions of solution quenching, cold deformation and aging treatment to adapt to the requirement of the 5-meter-class special-shaped ring, thereby achieving high performance.
The application provides a 5-meter-class special-shaped ring and a preparation method thereof. The 5-meter-level special-shaped ring provided by the application is an aluminum lithium alloy special-shaped ring, and the outer diameter is 5000-5500 mm; the tangential tensile strength is 485-587 MPa, the tangential yield strength is 408-536 MPa, and the tangential elongation is 5-13%; the axial tensile strength is 485-551 MPa, the axial yield strength is 395-389 MPa, and the axial elongation is 5-8%; the radial tensile strength is 493-552 MPa, the yield strength is 440-503 MPa, and the elongation is 3-6%. The method provided by the application can be used for preparing the 5-meter-class special-shaped ring, and has large size and high three-dimensional mechanical property.
Drawings
FIG. 1 is a drawing of a machining of a 5-meter grade profiled ring according to the application;
fig. 2 is a diagram showing the processing of a 5-meter shaped ring blank before quenching.
Detailed Description
The application discloses a 5-meter-class special-shaped ring and a preparation method thereof. Those skilled in the art can, with the benefit of this disclosure, suitably modify the process parameters to achieve this. It is expressly noted that all such similar substitutions and modifications will be apparent to those skilled in the art, and are deemed to be included in the present application. While the methods and applications of this application have been described in terms of preferred embodiments, it will be apparent to those skilled in the relevant art that the application can be practiced and practiced with modification and alteration and combination of the methods and applications herein without departing from the spirit and scope of the application.
The application is further illustrated by the following examples:
1.1 preparation of materials
1.1.1 composition of ingot: 2195 alloy, composition shown in table 1:
TABLE 1
1.1.2 ingot casting specifications: 370 x 1310 x 180mm (thick x wide x long);
1.1.3 ingot casting mass: primary oxidation film, primary loosening and uniform fire treatment;
1.2 heating
1.2.1 tool heating: the temperature is set to 450 ℃, a flat anvil set in 2300X 2200mm is heated for at least 16 hours, and a long punch with phi of 500mm is heated for at least 6 hours.
1.2.2 heating of the blank: heating temperature is 460+/-10 ℃ and constant temperature is 460 ℃; and the ingot is kept warm for more than 760 minutes.
1.3 forging cogging
1.3.1 apparatus: a10000 ton free forging press is matched with a flat anvil.
1.3.2 forging process requirements:
(1) The forging temperature is 430-470 ℃, the final forging temperature is more than or equal to 350 ℃, and the die use temperature is more than or equal to 280 ℃. The open forging and finish forging temperatures were measured and recorded piece by piece.
(2) The forging steps were as follows, tapping and temperature measurement were performed and transfer times were recorded, forging speed 15mm±5/s, and prior to forging, the surfaces of the billets were marked with pitch a (370 x 1310 mm), B (370 x 1800 mm), C (1310 x 1800 mm).
(3) Four piers and three drawing are carried out according to the forging steps (1) - (9):
(1) upsetting the end face of the ingot with a pitch mark a, a to a height=820+20 mm
(2) The sides of the ingot are marked B, C with bitumen. B square and drawn (A, C width=730+ -10 mm, B length about 2000 mm)
(3) Upsetting to a height = 820+20mm
(4) Cbeat square and draw (A, B width=730+ -10 mm, C length about 2000 mm)
(5) Upsetting to a height = 820+20mm
(6) A square beating, drawing, rolling to phi 900+/-20 mm
(7) Upsetting to a height = 550+20mm
(8) And (3) punching a central hole by using a phi 500 long punch, and centering by using a ruler (the eccentricity is less than or equal to 20 mm), wherein the punched connecting skin=100-200 mm.
(9) Leveling A to a height=520+ -10 mm
(4) Imprinting: alloy, batch, melt and part number are printed on the blank piece by using steel seal.
1.4 center hole machining
Machining the surplus material of the center, and turning over 90% of punching taper.
1.5 heating before reaming
1.5.1 heating of the blank: heating temperature is 460+/-10 ℃, constant temperature is 460 ℃, and heat preservation time is at least 520 minutes.
1.5.2 heating the phi 500 core rod on a 1600 x 1600 small flat anvil at the constant temperature of 450 ℃ for at least 10 hours; the medium anvil 2300 x 2200 sets are heated for at least 16 hours.
1.6 reaming
1.6.1 reaming equipment and dies: 10000T oil press and 10T forging car. The upper die of the 10000T oil press is arranged on a 1600 x 1600 small flat anvil; and (3) installing a middle horse frame, wherein the horse frame is fixed by tools such as bolts and the like, the lower anvil is not dismounted, and one side of the middle horse frame abuts against the lower anvil.
1.6.2 temperature control: the forging temperature is 430-470 ℃, the reaming and finish forging temperature is more than or equal to 350 ℃, the flattening and finish forging temperature is more than or equal to 350 ℃, and the working temperature and the die use temperature are 250-420 ℃.
1.6.3 reaming: and (5) adding a phi 500 core rod in a 10000T oil press to ream until the outer diameter of the ring is 2500+/-50 mm. Reaming is completed for 6-7 circles, the previous circles are pressed 40-50 mm each time, the last circle is round, the pressing is not more than 20mm, the wall thickness difference is not more than 20mm, and the local protrusion is not more than 10mm.
1.7 heating before first Ring rolling
1.7.1 heating of the blank: heating temperature is 460+/-10 ℃, constant temperature is 460 ℃, and heat preservation time is at least 300 minutes.
1.8 first Ring Rolling
1.8.1 temperature: the initial rolling temperature is 430-470 ℃, and the final rolling temperature is more than or equal to 350 ℃.
1.8.2 rolling: the ring is rolled to an outside diameter dimension phi 3200 + -50 mm. The first pass rolling parameters are shown in tables 2 to 4:
TABLE 2
TABLE 3 Table 3
TABLE 4 Table 4
| Outer diameter of blank | 2534 | Wall thickness of blank | 267 | Height of blank | 600 |
| Ring outer diameter | 3194 | Wall thickness of ring | 197 | Ring height | 615 |
Immediately after 1.8.3 rolling, the dimensions were measured and recorded.
1.9 machining
The inner diameter of the machined ring blank is shown in fig. 1, and fig. 1 is a machined drawing of a 5-meter-class special-shaped ring according to the application.
1.10 preparation before second Ring Rolling
The special-shaped core roller is required to be installed before the blank is heated.
1.11 heating before second Ring Rolling
Heating the blank: heating temperature is 460+/-10 ℃, constant temperature is 460 ℃, and heat preservation time is at least 200 minutes.
1.12 second Ring rolling
1.12.1 temperature: the initial rolling temperature is 430-470 ℃, and the final rolling temperature is more than or equal to 350 ℃.
1.12.2 rolling: the ring was rolled to an outside diameter dimension Φ4940+10mm. The second pass rolling parameters are shown in tables 5 to 7:
TABLE 5
| Rolling stage | 1 | 2 | 3 | 4 | 5 |
| Outer diameter (mm) finally | 3282 | 3809 | 4687 | 4862 | 4950 |
| End wall thickness (mm) | 193 | 162 | 129 | 124 | 121 |
| Final ring height (mm) | 625 | 630 | 635 | 635 | 635 |
| Primary growth rate (mm/s) | 1.0 | 2.5 | 3.5 | 4.0 | 1.0 |
| Final growth rate (mm/s) | 3.0 | 4.0 | 4.5 | 2.0 | 1.0 |
| Radial/axial compression ratio | 1.1 | 1.0 |
TABLE 6
TABLE 7
| Outer diameter of blank | 3194 | Wall thickness of blank | 197 | Height of blank | 615 |
| Ring outer diameter | 4950 | Wall thickness of ring | 121 | Ring height | 635 |
Immediately after 1.12.3 rolling, the dimensions were measured and recorded.
1.13 machining
1.13.1 the upper and lower end surfaces are folded to 600-2mm in height, the size requirement is shown in figure 2, and figure 2 is a processing diagram before quenching of the ring blank of the 5-meter special-shaped ring.
The circumference of the 1.13.2 ring is equally divided into 8 sections for measuring the inner diameter, the outer diameter and the height, and steel seal marks are printed at the measuring positions.
1.14 solution quenching (need to connect with transport vehicle before charging and debug external commission bulging equipment)
1.14.1 apparatus: heat treatment furnace with uniformity of +/-5 DEG C
1.14.2 quenching system: the solution temperature and time are referred to Table 8, and the quenching water temperature is 30-40 ℃.
1.15 Cold bulging
The cold bulging rate is 3.0-4.0%, and the outer diameter is controlled to be 5052+10mm after bulging.
1.16 Artificial aging
Aging temperature and time refer to table 8, air incubation for 18 hours.
TABLE 8
The products of examples 1 to 11 were subjected to performance tests, and the results are shown in Table 9:
TABLE 9
The foregoing is only a preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art, who is within the scope of the present application, should make equivalent substitutions or modifications according to the technical scheme of the present application and the inventive concept thereof, and should be covered by the scope of the present application.
Claims (10)
1. A5-meter-class special-shaped ring is characterized in that the special-shaped ring is an aluminum-lithium alloy special-shaped ring, and the outer diameter is 5000-5500 mm;
the tangential tensile strength is 485-587 MPa, the tangential yield strength is 408-536 MPa, and the tangential elongation is 5-13%;
the axial tensile strength is 485-551 MPa, the axial yield strength is 395-511 MPa, and the axial elongation is 5-8%;
the radial tensile strength is 490-552 MPa, the yield strength is 435-503 MPa, and the elongation is 3-6%.
2. The 5-meter class profiled ring as claimed in claim 1, wherein the composition of the 5-meter class profiled ring comprises:
less than 0.08wt% of Si, less than 0.10wt% of Fe, 3.8wt% to 4.2wt% of Cu, 0.8wt% to 1.3wt% of Li, 0.25wt% to 0.7wt% of Mg, 0.25wt% to 0.5wt% of Ag, 0.08wt% to 0.16wt% of Zr, less than 0.1wt% of Ti, and the balance of Al.
3. The preparation method of the 5-meter-class special-shaped ring is characterized by comprising the following steps of:
s1) punching and leveling an aluminum-lithium alloy cylindrical ingot with the diameter of 900+/-20 mm and the height of 550+20mm to obtain a ring with the inner diameter of 500mm and the height of 520+10 mm;
s2) after the ring piece obtained in the step S1) is subjected to center hole processing, heating and reaming are carried out, and then rolling and machining are sequentially carried out for a plurality of times, so that a 5-meter-class special-shaped ring piece is obtained;
s3) sequentially carrying out solution quenching at 480-520 ℃ for 300-600 min, cold bulging and ageing at 145-160 ℃ for 10-45 h on the 5-meter-level special-shaped ring piece obtained in the step S2) to obtain the 5-meter-level special-shaped ring.
4. A method according to claim 3, wherein in step S1), the aluminum-lithium alloy cylinder ingot is obtained by:
a) Upsetting the first end face, the second end face and the third end face of the aluminum lithium alloy cuboid ingot until the heights of the end faces are 820+20mm, and square drawing the second end face and the third end face to 730+/-10 mm multiplied by 730+/-10 mm respectively; the first end face is a thick-wide face, the second end face is a thick-long face, and the third end face is a wide-long face;
b) And c), square drawing, rolling and upsetting are carried out on the first end face of the cast ingot obtained in the step a), and an aluminum-lithium alloy cylindrical cast ingot with the diameter of 900+/-20 mm and the height of 550+20mm is obtained.
5. The method according to claim 3, wherein in the step S3), the solution hardening is performed at a temperature of 505 to 515℃and a time of 300 to 400 minutes.
6. The method according to claim 3, wherein the aging treatment in step S3) is performed at 145 to 150 ℃ for 30 to 45 hours.
7. The method according to claim 3, wherein in step S2), the heating reaming is specifically: reaming is carried out for 6-7 circles until the outer diameter is 2500+/-50 mm at the temperature of more than or equal to 350 ℃, the reaming reduction of the last circle is not more than 20mm, the reaming reduction of other circles is 40-50 mm, the wall thickness difference is not more than 20mm, and the local protrusion is not more than 10mm.
8. A method according to claim 3, wherein in step S2), the rolling and the machining are performed several times in sequence:
after the first rolling and the first machining, the second rolling and the second machining are performed:
the first rolling is specifically as follows: at the temperature of more than or equal to 350 ℃, the ring after reaming is rolled for the first time sequentially according to the outer diameter of 2567mm and the wall thickness of 258mm, the outer diameter of 2765mm and the wall thickness of 231mm, the outer diameter of 3095mm and the wall thickness of 204mm, the outer diameter of 3161mm and the wall thickness of 199mm, and the outer diameter of 3194mm and the wall thickness of 197 mm;
the second rolling is specifically as follows: and (3) rolling the ring piece after the first machining for the second time according to the outer diameter of 3282mm and the wall thickness of 193mm, the outer diameter of 3809mm and the wall thickness of 162mm, the outer diameter of 4687mm and the wall thickness of 124mm, the outer diameter of 4862mm and the wall thickness of 124mm, and the outer diameter of 4950mm and the wall thickness of 121mm in sequence at the temperature of more than or equal to 350 ℃.
9. A method according to claim 3, wherein in step S1), the composition of the aluminum lithium alloy cylinder ingot comprises:
less than 0.08wt% of Si, less than 0.10wt% of Fe, 3.8wt% to 4.2wt% of Cu, 0.8wt% to 1.3wt% of Li, 0.25wt% to 0.7wt% of Mg, 0.25wt% to 0.5wt% of Ag, 0.08wt% to 0.16wt% of Zr, less than 0.1wt% of Ti, and the balance of Al.
10. The preparation method according to any one of claims 3 to 9, wherein the outer diameter of the 5-meter-class profiled ring is 5000 to 5500mm;
the tangential tensile strength of the 5-meter-level special-shaped ring is 485-587 MPa, the tangential yield strength is 408-536 MPa, and the tangential elongation is 5-13%;
the axial tensile strength of the 5-meter-level special-shaped ring is 485-551 MPa, the axial yield strength is 395-511 MPa, and the axial elongation is 5-8%;
the radial tensile strength of the 5-meter-class special-shaped ring is 490-552 MPa, the yield strength is 435-503 MPa, and the elongation is 3-6%.
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| CN202311111838.3A CN117165814A (en) | 2023-08-31 | 2023-08-31 | 5-meter-level special-shaped ring and preparation method thereof |
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