CN118023300A - Rolling method for greatly reducing defects of TA18 alloy pipe - Google Patents
Rolling method for greatly reducing defects of TA18 alloy pipe Download PDFInfo
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- CN118023300A CN118023300A CN202410220507.1A CN202410220507A CN118023300A CN 118023300 A CN118023300 A CN 118023300A CN 202410220507 A CN202410220507 A CN 202410220507A CN 118023300 A CN118023300 A CN 118023300A
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 43
- 239000000956 alloy Substances 0.000 title claims abstract description 43
- 230000007547 defect Effects 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000005096 rolling process Methods 0.000 title claims abstract description 21
- 229910001069 Ti alloy Inorganic materials 0.000 claims abstract description 48
- 238000005242 forging Methods 0.000 claims abstract description 47
- 238000005097 cold rolling Methods 0.000 claims abstract description 21
- 238000000137 annealing Methods 0.000 claims abstract description 14
- 238000005488 sandblasting Methods 0.000 claims abstract description 10
- 239000011265 semifinished product Substances 0.000 claims description 7
- 238000003754 machining Methods 0.000 claims description 6
- 239000000047 product Substances 0.000 claims description 4
- 238000004321 preservation Methods 0.000 claims description 3
- 239000006061 abrasive grain Substances 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 abstract description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 16
- 229910052719 titanium Inorganic materials 0.000 description 16
- 239000010936 titanium Substances 0.000 description 16
- 239000000463 material Substances 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- 238000010923 batch production Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
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Abstract
The invention discloses a rolling method for greatly reducing defects of a TA18 alloy pipe, and belongs to the technical field of titanium alloy processing. The rolling method for greatly reducing the defects of the TA18 alloy pipe comprises the following steps: performing two-roll cold rolling on the TA18 alloy tube blank, and removing internal surface defects by sand blasting; b. annealing and straightening; c. repeating the step A-B for 2-3 times; d. and performing rotary forging twice to obtain a TA18 alloy tube finished product. The rolling method can lead the deformation of the titanium alloy tube to be more uniform, lead the surface of the titanium alloy tube to be smoother, greatly reduce the generation of defects, and effectively solve the problems of defects on the surface and lower yield in the existing titanium alloy tube preparation process in the prior art.
Description
Technical Field
The invention belongs to the technical field of titanium alloy processing, relates to a production method of a titanium alloy seamless tube, and in particular relates to a rolling method for greatly reducing defects of a TA18 alloy tube.
Background
The titanium alloy with light weight, high strength, corrosion resistance and excellent fatigue resistance and crack expansion resistance is a preferred material for realizing high performance, long service life and high reliability of the aerospace hydraulic pipeline system. The most typical material is TA18 (Ti-3 Al-2.5V) titanium alloy, which not only has good room temperature mechanical property and corrosion resistance, but also has excellent cold and hot working process plasticity, formability and weldability. But satisfies TA18 titanium alloy pipe that aviation space was used, and not only the processing degree of difficulty is huge, and the yield is low.
The two-roller cold rolling mode is adopted to process and reduce the diameter of the titanium alloy tube finished product, the pass processing rate is high, and the production efficiency is high. However, in the cold rolling process, the contact area of the roller and the titanium alloy tube is larger, so that the generated friction force is larger, stronger shearing force is generated on the surface of the titanium alloy tube, and the surface quality of the titanium alloy tube is greatly reduced; meanwhile, the two sides of the roller are provided with openings, and the flowing directions of materials at different positions are inconsistent, so that the anisotropy of the cold-rolled materials is caused. The titanium alloy tube is processed and reduced by adopting a rotary forging mode, the rotary forging deformation is small, and the deformation is uniform; the surface of the material after rotary forging is smooth; the precision of the rotary forging product is high; the three-way compression stress state of the rotary forging processing area is beneficial to the processing deformation of materials. But the rotary forging processing production efficiency is lower, and the single-pass deformation is smaller.
Based on the above situation, the advantages of two-roller cold rolling and rotary forging processing are fully utilized, the research on the preparation method of the titanium alloy tube with high flaw detection qualification rate and good surface quality is carried out, the yield of the titanium alloy tube is improved, the cost is reduced, and stable and batch production is necessary.
Disclosure of Invention
The invention aims to solve the technical problems that the surface of the existing titanium alloy tube has defects and the yield is low in the preparation process of the titanium alloy tube.
The technical scheme adopted for solving the technical problems is as follows: a rolling method for greatly reducing defects of TA18 alloy tubes comprises the following steps:
Performing two-roll cold rolling on the TA18 alloy tube blank, and then removing internal surface defects by sand blasting;
b. C, annealing and straightening the titanium alloy tube treated in the step a;
c. Repeating the step A-B for 2-3 times to obtain a titanium alloy tube semi-finished product;
d. and (5) performing rotary forging on the titanium alloy tube semi-finished product twice by adopting a rotary forging machine to obtain a TA18 alloy tube finished product.
In the step a, the TA18 alloy tube blank does not have special orientation texture, and the texture of the TA18 alloy tube blank is an equiaxed texture.
In the step a, before the TA18 alloy tube blank is cold rolled, burrs, pits and cracks are not formed on the surface of the TA18 alloy tube blank.
In the step a, the cold rolling reduction ratio is more than 0.5 and less than 0.7.
In the step a, the ratio Q of the relative wall reduction to the relative diameter reduction of the two-roll cold-rolled TA18 alloy tube blank is greater than 1 and less than 1.5.
In the step a, the abrasive grain size used for sand blasting is not less than 100 meshes.
In the step b, the annealing temperature is 650-750 ℃ and the heat preservation time is 1-3h; after annealing, the titanium alloy tube should have an equiaxed structure.
In the step b, after the titanium alloy pipe is straightened, the straightness of the titanium alloy pipe is less than 1mm/m.
In the step d, the die in the rotary forging machine is replaced with a die similar to the target outer diameter size, and the core rod size is replaced with the target inner diameter size.
In the step d, the processing rate of the titanium alloy tube after single rotary forging is more than 0.25 and less than 0.35, and the ratio Q of the relative wall reduction amount to the relative diameter reduction amount of the titanium alloy tube after single rotary forging is more than 1.5 and less than 2.5.
The beneficial effects of the invention are as follows: the rolling method of the invention firstly carries out cold rolling and annealing alternately by two rollers to obtain the seamless tube semi-finished product with high dimensional accuracy, more uniform and fine structure and no defect on the inner surface and the outer surface. The titanium alloy tube is reduced by rotary forging in the follow-up process, and the deformation of the titanium alloy tube is more uniform through multiple small deformation, and the friction between the titanium alloy tube and the grinding tool is effectively reduced, so that the surface of the titanium alloy tube is smoother. Meanwhile, the deformation of each reducing pass and the ratio Q of the relative wall reduction to the relative diameter reduction are controlled, the two-roller cold rolling adopts a smaller Q value, so that the formation of a strong radial texture is avoided, the rotary forging adopts a large Q value, the inner wall folds caused by instability in the deformation process of the TA18 alloy tube are reduced, and the defects are greatly reduced.
Detailed Description
The technical scheme of the invention can be implemented in the following way.
1. A rolling method for greatly reducing defects of TA18 alloy tubes specifically comprises the following steps:
A. Performing two-roll cold rolling on the TA18 alloy tube blank;
B. Sand blasting the titanium alloy tube after cold rolling to remove the inner surface defect;
C. Annealing and straightening the cold-rolled titanium alloy tube;
D. Repeating the step A-C for 2-3 times to obtain a titanium alloy tube semi-finished product;
E. Performing first rotary forging on the titanium alloy tube semi-finished product by adopting a rotary forging machine;
F. and (5) performing second rotary forging on the titanium alloy tube by adopting a rotary forging machine.
In the step A, the TA18 alloy tube blank does not have special orientation texture, and the texture of the TA18 alloy tube blank is an equiaxed texture; before cold rolling, the TA18 alloy tube blank has no burrs, pits and cracks on the surface.
In the step A, the cold rolling reduction ratio is more than 0.5 and less than 0.7; the ratio Q of the relative wall reduction to the relative diameter reduction of the two-roll cold-rolled TA18 alloy tube blank is greater than 1 and less than 1.5.
In the step B, the granularity of the abrasive used for sand blasting is not less than 100 meshes.
In the step C, the annealing temperature is 650-750 ℃, and the heat preservation time is 1-3 h; after annealing, the TA18 alloy tube has an equiaxed structure; after the titanium tube is straightened, the straightness of the titanium tube is less than 1mm/m.
In the step E and the step F, the die in the rotary forging machine is replaced by a die with the size similar to the target outer diameter, and the size of the core rod is replaced by the size of the target inner diameter; the machining rate of the titanium tube after single rotary forging is more than 0.25 and less than 0.35, and the ratio Q of the relative wall reduction amount to the relative diameter reduction amount of the titanium tube after single rotary forging is more than 1.5 and less than 2.5.
The technical scheme and effect of the present invention will be further described by practical examples.
Examples
Example 1: this example illustrates a rolling method of TA18 alloy tube having a diameter of Φ33mm by 4.3mm (outer diameter by wall thickness) →Φ8mm by 0.6mm.
A. alternately performing two-roll cold rolling, sand blasting and annealing on the titanium tube with the diameter of phi 33mm being 4.3mm, the diameter of phi 23mm being 2.8mm, the diameter of phi 16mm being 1.8mm and the diameter of phi 10mm being 1mm after heat treatment, wherein the two-roll cold rolling with three passes is performed, the first pass working rate is 0.54, and the Q value is 1.15; the second pass has a working rate of 0.55 and a Q value of 1.17; the third pass had a working ratio of 0.65 and a Q value of 1.19.
B. and D, replacing the rotary forging machine with a die with the diameter of 9mm and a core rod with the diameter of 7.4, and adopting the rotary forging machine to rotary forge the titanium tube with the diameter of 10mm and 1mm which are straightened in the step A to 0.8mm with the diameter of 9mm at one time, wherein the processing rate is 0.27, and the Q value is 2.
C. and (3) replacing the rotary forging machine with a die with phi 8mm and a core rod with phi 7, and adopting the rotary forging machine to rotary forge the titanium tube with phi 9mm and 0.8mm in the step B to 0.6mm and 0.32 in machining rate and 2.25 in one step.
The TA18 titanium alloy tube with the diameter of phi 8mm and the diameter of 0.6mm is obtained after rotary forging, and has smooth surface and no defects such as scratches, pits, wrinkles and the like.
Example 2: this example illustrates a rolling method of TA18 alloy tube having a thickness of Φ23mm×4.3mm (outer diameter×wall thickness) →Φ6mm×0.6mm.
A. alternately performing two-roll cold rolling, sand blasting and annealing on the titanium tube with the diameter of phi 23mm and the diameter of 4.3mm after heat treatment, and performing three-pass two-roll cold rolling according to the conditions of phi 23mm, 4.3mm, phi 17mm, 2.8mm, phi 12mm, 1.8mm and phi 8mm, wherein the first pass working rate is 0.51 and the Q value is 1.34; the second pass has a working rate of 0.54 and a Q value of 1.21; the third pass had a working rate of 0.62 and a Q value of 1.33.
B. and D, replacing the rotary forging machine with a die with phi 7mm and a core rod with phi 5.4, and adopting the rotary forging machine to forge the titanium tube with phi 8mm and 1mm which are straightened in the step A to 0.8mm with phi 7mm at one time, wherein the processing rate is 0.29, and the Q value is 1.6.
C. And D, replacing the rotary forging machine with a die with phi 6mm and a core rod with phi 4.8, and adopting the rotary forging machine to rotary forge the titanium tube with phi 7mm and 0.8mm in the step B to 0.6mm and 0.35 in diameter at one time, wherein the machining rate is 1.75.
The TA18 titanium alloy tube with the diameter of phi 6mm and the diameter of 0.6mm is obtained after rotary forging, and has smooth surface and no defects such as scratches, pits, wrinkles and the like.
Comparative example 1: the method of reducing the diameter by swaging a TA18 alloy tube of Φ33mm x 4.3mm (outer diameter x wall thickness) →Φ8mm x 0.6mm was followed in example 1, except that the raw material was titanium tube of Φ33mm x 9 mm.
A. Alternately performing two-roll cold rolling, sand blasting and annealing on the titanium tube with the diameter of 9mm which is subjected to heat treatment, wherein three passes of two-roll cold rolling are performed according to the diameter of 9mm which is subjected to heat treatment, the diameter of 4.5mm which is subjected to diameter of 23mm which is subjected to diameter of 4.5mm which is subjected to diameter of 16mm which is 2.3mm which is 1mm which is subjected to diameter of 10mm, the first pass machining rate is 0.61, and the Q value is 1.65; the second pass has a working rate of 0.62 and a Q value of 1.61; the third pass had a working ratio of 0.71 and a Q value of 1.51. The Q value of each pass is greater than 1.5.
B. and D, replacing the rotary forging machine with a die with the diameter of 9mm and a core rod with the diameter of 7.4, and adopting the rotary forging machine to rotary forge the titanium tube with the diameter of 10mm and 1mm which are straightened in the step A to 0.8mm with the diameter of 9mm at one time, wherein the processing rate is 0.27, and the Q value is 2.
C. and (3) replacing the rotary forging machine with a die with phi 8mm and a core rod with phi 7, and adopting the rotary forging machine to rotary forge the titanium tube with phi 9mm and 0.8mm in the step B to 0.6mm and 0.32 in machining rate and 2.25 in one step.
When the TA18 titanium alloy tube with the diameter of phi 9mm and the diameter of 0.8mm is obtained after the first rotary forging, the transverse cracks exist on the inner surface and the outer surface due to the fact that the two-roller cold rolling in the front has strong radial texture, the subsequent rotary forging processing with a large Q value is difficult.
Comparative example 2: according to the method for reducing the diameter by rotary forging of the TA18 alloy tube with the diameter of phi 8mm and 1mm (the outer diameter and the wall thickness) and the diameter of phi 6mm and 0.6mm in the embodiment 2, except that in the step B, a rotary forging machine is replaced by a die with the diameter of phi 6mm and a mandrel with the diameter of phi 4.8, and the rotary forging machine is adopted to rotary forge the titanium alloy tube with the diameter of phi 8mm and 1mm which is straightened in the step A to the diameter of phi 6mm and 0.6mm at one time.
The single rotary forging processing rate of the TA18 titanium alloy titanium tube with the diameter of phi 6mm and the diameter of 0.6mm is 53.7%, and the inner surface and the outer surface of the titanium tube have the defects of burrs, pits, cracks and the like.
Claims (10)
1. A rolling method for greatly reducing defects of TA18 alloy tubes is characterized by comprising the following steps:
Performing two-roll cold rolling on the TA18 alloy tube blank, and then removing internal surface defects by sand blasting;
b. C, annealing and straightening the titanium alloy tube treated in the step a;
c. Repeating the step A-B for 2-3 times to obtain a titanium alloy tube semi-finished product;
d. and (5) performing rotary forging on the titanium alloy tube semi-finished product twice by adopting a rotary forging machine to obtain a TA18 alloy tube finished product.
2. The rolling method for greatly reducing the defects of the TA18 alloy tube according to claim 1, which is characterized in that: in the step a, the TA18 alloy tube blank does not have special orientation texture, and the texture is an equiaxed texture.
3. The rolling method for greatly reducing the defects of the TA18 alloy tube according to claim 1, which is characterized in that: in the step a, before the TA18 alloy tube blank is cold rolled, burrs, pits and cracks do not exist on the surface of the TA18 alloy tube blank.
4. The rolling method for greatly reducing the defects of the TA18 alloy tube according to claim 1, which is characterized in that: in the step a, the cold rolling reduction ratio is more than 0.5 and less than 0.7.
5. The rolling method for greatly reducing the defects of the TA18 alloy tube according to claim 1, which is characterized in that: in the step a, the ratio Q of the relative wall reduction to the relative diameter reduction of the two-roll cold-rolled TA18 alloy tube blank is more than 1 and less than 1.5.
6. The rolling method for greatly reducing the defects of the TA18 alloy tube according to claim 1, which is characterized in that: in the step a, the abrasive grain size used for sand blasting is not less than 100 meshes.
7. The rolling method for greatly reducing the defects of the TA18 alloy tube according to claim 1, which is characterized in that: in the step b, the annealing temperature is 650-750 ℃ and the heat preservation time is 1-3h; after annealing, the titanium alloy tube should have an equiaxed structure.
8. The rolling method for greatly reducing the defects of the TA18 alloy tube according to claim 1, which is characterized in that: in the step b, after the titanium alloy pipe is straightened, the straightness of the titanium alloy pipe is less than 1mm/m.
9. The rolling method for greatly reducing the defects of the TA18 alloy tube according to claim 1, which is characterized in that: in step d, the die in the rotary forging machine is replaced by a die similar to the target outer diameter size, and the core rod size is replaced by the target inner diameter size.
10. The rolling method for greatly reducing the defects of the TA18 alloy tube according to claim 1, which is characterized in that: in the step d, the machining rate of the titanium alloy tube after single rotary forging is more than 0.25 and less than 0.35, and the ratio Q of the relative wall reduction amount to the relative diameter reduction amount of the titanium alloy tube after single rotary forging is more than 1.5 and less than 2.5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202410220507.1A CN118023300A (en) | 2024-02-28 | 2024-02-28 | Rolling method for greatly reducing defects of TA18 alloy pipe |
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| CN202410220507.1A CN118023300A (en) | 2024-02-28 | 2024-02-28 | Rolling method for greatly reducing defects of TA18 alloy pipe |
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