CN105033568A - Forming method of titanium alloy oil tank shell - Google Patents
Forming method of titanium alloy oil tank shell Download PDFInfo
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- CN105033568A CN105033568A CN201510257630.1A CN201510257630A CN105033568A CN 105033568 A CN105033568 A CN 105033568A CN 201510257630 A CN201510257630 A CN 201510257630A CN 105033568 A CN105033568 A CN 105033568A
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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
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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Abstract
The invention belongs to the field of precise panel machining, and discloses a forming method of a titanium alloy oil tank shell. The forming method comprises the following steps that firstly, the shape of an unfolded material of a component is calculated according to the theoretical diameter of the neutral plane of the titanium alloy oil tank shell, blanking is carried out in the direction of fiber of a rolled blank, and a panel material is obtained; secondly, the cold roll bending diameter of the oil tank shell is determined according to the structural parameters of a cold roll machine; thirdly, roll bending forming is carried out on the panel material through the cold roll machine according to the cold roll bending diameter of the oil tank shell; fourthly, butt welding is carried out on the panel material formed through roll bending; and fifthly, thermal correcting and stabilizing processing are carried out on a cylindrical piece formed through welding. The technology allowance and machining procedures needed by the thermal forming technology are greatly saved through unfolded material calculation, drive wheel pressing displacement compensation calculation, electron beam butt welding and the composite technology of thermal correcting and stabilizing processing; and according to the precise forming technology of the whole oil tank shell, the production efficiency is greatly improved, and the producing and manufacturing cost is reduced.
Description
Technical field
The invention belongs to accurate panel beating field, relate to a kind of titanium alloy fuel tank shell manufacturing process, mainly apply to the precision form of straight tube shape titanium alloy fuel tank shell.
Background technology
Titanium or titanium alloy is a kind of excellent structural timber, and along with the expansion year by year of its consumption, the application in the processing and manufacturing of various engineering structure and equipment gets more and more.Because titanium alloy intensity is high, Plastic phase is to poor, machining deformation drag is large, deformation range is narrow, and additional titanium alloy elastic modulus is little, the inherent characteristics such as resilience is large, make its formed machining more difficult, if method is improper or technique is unreasonable, often causes workpiece to meet technical requirement, even cause and scrap.Therefore, the component shaping high for most of alloy strength, sheet metal thickness is large, complex-shaped or deflection is large, the hot formed technique of many employings.But the electric energy that heat forming technology expends, die cost, cost of labor and production efficiency etc. are all much higher than cold forming process.
The cold breakdown o ing technique of current ambient temperature, general applicable steel, aluminium material part, use less in titanium alloy material, owing to existing for the lower nearly α phase of plasticity, alpha-beta phase titanium alloy (as TA15, TC4 etc.), elasticity is high, rigidity is low, poor heat conductivity, hardness high, easily occurs the problem such as cold breakdown crackle and cold breakdown radius inaccuracy in the process of cold breakdown.Along with improving constantly in aerospace field rocket and missile flight speed, the utilization of titanium alloy fuel tank shell constantly expands, but the forming technology of titanium alloy fuel tank shell is comparatively complicated at present, heat forming technology/machine is adopted to add/the combined forming process of longitudinal seam welding/hot school shape, manufacturing cost is high, and turn around time is long.
Summary of the invention
(1) technical problem that will solve
The object of this invention is to provide a kind of titanium alloy fuel tank shell manufacturing process, substitute existing titanium alloy fuel tank shell heat forming technology/machine and add/the combined forming process of longitudinal seam welding/hot school shape, realize rational technology, simple to operate, location and cutting accuracy high, to enhance productivity and to reduce manufacturing cost.
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides a kind of titanium alloy fuel tank shell manufacturing process, it comprises the following steps:
Step one: by titanium alloy fuel tank shell neutral line theoretical diameter Size calculation part spread material shape, and along the machine direction blanking of rolling blank, obtain dull and stereotyped plate;
Step 2: according to the structural parameters determination fuel tank shell cold breakdown bend diameter of cold breakdown machine;
Step 3: utilize cold breakdown machine to carry out roll forming according to fuel tank shell cold breakdown bend diameter to dull and stereotyped plate;
Step 4: docking welding is carried out to the plate of roll forming;
Step 5: hot school shape and stabilization processes are carried out to the cylindrical element that welding is formed.
Wherein, in described step 2, described cold breakdown machine comprises the first bottom roller, the second bottom roller and upper roller, and upper roller is driving wheel, and external diameter is R2; First bottom roller and the second bottom roller are driven pulleys, and external diameter is equal, and external diameter is R1; Centre distance between two driven pulleys is 2a; The curved internal diameter of fuel tank shell cold breakdown is that R, R are greater than R2; The thickness of dull and stereotyped plate is h, and start contact point as zero point using upper roller and dull and stereotyped plate, pressing down displacement is S; The depression distance of springback compensation is 1.0h ~ 2.0h, then upper roller presses down the relational expression of displacement S and radius of curvature R and is:
Wherein, in described step 3, in roll forming process, using the machine direction of described dull and stereotyped plate as feed direction, the front end of plate contacts rear stopping with the peak of the first bottom roller, regulate upper roller to contact with plate, the depression distance of upper roller puts in place according to the adjustment of S value, contact after-applied pressure, applying pressure size is 20KN ~ 40KN.
Wherein, in described step 3, cold breakdown machine is in plate roll forming process, and upper roller is by carrying out roll forming with the first bottom roller and the second bottom roller to the contact friction force of titanium alloy plate, and wherein the roll bending speed of driving wheel is 10 ~ 15mm/s.
Wherein, in described step 3, cold breakdown machine in plate roll forming process, plate end near the second bottom roller time, regulate driving wheel reversely rotate roll bending, carry out four roll bendings back and forth and correct shape, speed is down to 5 ~ 8mm/s.
Wherein, in described step 4, first put into go to clamp to flatten to part two ends recruitment after roll bending and locate, then at joint, the butt welding of docking pulse TIG welding is carried out to the cold breakdown part after clamping pressing.
Wherein, in described step 5, packed into by the cylindrical element of welding forming on the shape mould of tubular hot school, to give fixed mold external diameter for benchmark, shove charge under normal temperature, is heated to 800 ± 5 DEG C of insulation 120min, cools to less than 150 DEG C with the furnace and come out of the stove.
(3) beneficial effect
The titanium alloy fuel tank shell manufacturing process that technique scheme provides, by novel, reasonably spread material calculates, driving wheel presses down that bit shift compensation calculates, the combination process of electron beam butt welding and hot school shape stabilization processes, achieve common cold breakdown machine and can realize the curved Accurate Shaping of a kind of titanium alloy fuel tank shell cold breakdown, instead of existing titanium alloy and divide half heat forming technology, greatly save the process allowance required for heat forming technology and machined sequence; The precision form flow process of whole fuel tank shell substantially increases production efficiency and reduces manufacturing cost.
Accompanying drawing explanation
Fig. 1 is the curved schematic diagram of titanium alloy fuel tank shell cold breakdown;
Fig. 2 is titanium alloy fuel tank shell weld seam schematic diagram;
Fig. 3 is titanium alloy fuel tank shell hot school shape mould schematic diagram;
Fig. 4 is titanium alloy fuel tank shell hot school shape schematic diagram.
In figure, 1-first bottom roller; 2-second bottom roller; The dull and stereotyped plate of 3-; 4-upper roller; 5-first straightway; 6-joint; 7-second straightway; 8-cylindrical element; 9-hot school shape mould.
Detailed description of the invention
For making object of the present invention, content and advantage clearly, below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.
Shown in Fig. 4, the present embodiment titanium alloy fuel tank shell manufacturing process, be specially adapted to the precision form of straight tube shape titanium alloy fuel tank shell, it comprises the following steps:
Step one: calculate blanking
By titanium alloy fuel tank shell neutral line theoretical diameter Size calculation part spread material shape, and along the machine direction blanking of rolling blank, obtain dull and stereotyped plate 3.
Step 2: determine fuel tank shell cold breakdown bend diameter
By the cold breakdown bend diameter of the relative position determination fuel tank shell of the first bottom roller 1, second bottom roller 2 and upper roller 4.Wherein upper roller 4 is driving wheels, and external diameter is R2; First bottom roller 1 and the second bottom roller 2 are driven pulleys, and external diameter is equal, and external diameter is R1; Centre distance between two driven pulleys is 2a; If the size that the curved internal diameter of fuel tank shell cold breakdown is R, R value must be greater than the external diameter value R2 of upper roller 4; The thickness of dull and stereotyped plate 3 is h, and start contact point as zero point using upper roller 4 and dull and stereotyped plate 3, pressing down displacement is S; Because of the easy resilience of titanium alloy, then depression distance needs to consider springback compensation amount, and the depression distance of springback compensation is 1.0 ~ 2.0h, then upper roller 4 presses down the relational expression of displacement S and radius of curvature R and is:
Step 3: roll forming is carried out to dull and stereotyped plate
First, according to the feeding positioning guide rail regulated with regard to blank shape on cold breakdown machine, ensure that the machine direction of plate is as feed direction, the front end of plate just contacts rear stopping with the peak of the first bottom roller 1, upper roller 4 is regulated to contact with plate, the displacement that presses down that the depression distance of upper roller calculates according to step 2 is carried out adjustment and is put in place, and need after contact to carry out applying pressure, applying pressure size is 20KN ~ 40KN.
Then, starting device, upper roller 4 is by carrying out roll forming with the contact friction force of the first bottom roller 1 and the second bottom roller 2 pairs of titanium alloy plates, and wherein the roll bending speed of driving wheel 4 is at 10 ~ 15mm/s.
In roll forming process, in order to reduce resilience, the time marquis of plate end near the second bottom roller 2, regulate driving wheel 4 to reversely rotate roll bending, carry out four roll bendings back and forth and correct shape, speed is down to 5 ~ 8mm/s.
After roll bending completes, roll bending part is carried out welding front pickling processes, to improve the intensity of follow-up welding.
Step 4: welding
As shown in Figure 2, due to exist between the first bottom roller 1 and the second bottom roller 2 certain in spacing 2a, part two ends then after roll bending certainly exist the first straightway 5 and the second straightway 7 being greater than a value, therefore must carry out clamping by frock to two straightways before welding and flatten location.
At joint 6, the butt welding of docking pulse TIG welding is carried out to the cold breakdown part after clamping flattens.
Activity wherein due to titanium alloy is very strong, and weld seam is longer in addition, must carry out general protection by butt welded seam front and back.For nozzle, have selected larger-diameter nozzle, strengthen the protection in molten bath district.Front adopts argon gas to drag cover to carry out available protecting to molten bath, weld seam Ji Jinfeng district, and the weldering bakie that the back side adopts band to blow is protected sealing run and neighbouring high-temperature region.
For reaching good protected effect, the flow of each road argon gas and flow velocity will be selected suitably, should available protecting high-temperature region, are unlikely to again excessive and produce turbulent flow.Docking pulse TIG welding takes impulse welding to weld, in tungsten electrode diameter of phi 2.4, under the prerequisite that dutycycle 50% is certain, mainly carry out Proper Match between the parameters such as welding current, speed of welding and wire feed rate, obtain technological specification and the parameter of 1mm ~ 3mm thick titanium alloy plate docking pulse TIG welding, as shown in table 1.
Table 1 docks automatic TIG welding parameter
Step 5: correct
Because the cylindrical element 8 after welding exists distortion, and there is the first straightway 5 and the second straightway 7 in butt welding place of cold breakdown part, therefore need to carry out hot school shape and stabilization processes to cylindrical element 8, cylindrical element is packed on tubular hot school shape mould 9, with reference to shown in Fig. 3 and Fig. 4, hot school shape technological parameter: to give fixed mold external diameter for benchmark, shove charge under normal temperature, be heated to 800 ± 5 DEG C of insulation 120min, cool to less than 150 DEG C with the furnace and come out of the stove.
Wherein, hot school shape mould 9 there are 2 play hanging, convenient lifting and transport; For ease for the treatment of that school shape part is enclosed within cylinder, one chamfering being set in cylinder one end, leaving seam at the cylinder other end simultaneously, be convenient to part location.Consider the condition that titanium alloy shaping dies material should have, select stainless steel 1Cr18Ni9Ti as the material of Thermal expansion mould, this material all has stable non-oxidizability in the air of 800 DEG C ~ less than 900 DEG C, running hours, steel is stable below 900 DEG C, and under frequent alternating hot and cold condition during interrupter duty, be also stable below 800 DEG C.
Finally, the part after heat treatment is carried out pickling processes; Butt welded seam carries out X-ray examination, if meet design weld seam class requirement, is then delivered for use.
Embodiment 1
The titanium alloy plate that the present embodiment is selected is TA15M, and thickness is 2mm, the long 1000mm of straight tube, and in fuel tank straight tube, circular diameter is Φ 500mm.
The precision form of the present embodiment straight tube shape titanium alloy fuel tank shell comprises the following steps:
1) by titanium alloy fuel tank shell neutral line theoretical diameter Size calculation part spread material shape, and along the machine direction blanking of rolling blank, blanking specification is long 1577mm (machine direction) × 1000mm.
2) by the cold breakdown bend diameter of the relative position determination fuel tank shell of the first bottom roller 1, second bottom roller 2 and upper roller 4, wherein upper roller 4 is driving wheels, and external diameter is 45mm; First bottom roller 1 and the second bottom roller 2 are driven pulleys, and external diameter is equal, and external diameter is for being 35mm; Centre distance between two driven pulleys is 80mm; The thickness of dull and stereotyped plate 3 is 2mm, and start contact point as zero point using upper roller 4 and dull and stereotyped plate, pressing down displacement is S; The easy resilience of titanium alloy, then depression distance needs to consider springback compensation amount, then the depression distance of springback compensation is 1.5h, then upper roller 4 presses down the relational expression of displacement and bending radius and is:
3) according to the feeding positioning guide rail regulated with regard to blank shape on cold breakdown machine, ensure that the machine direction of plate is as feed direction, the front end of plate just contacts rear stopping with the peak of the first bottom roller 1, upper roller 4 is regulated to contact with plate, the depression distance of upper roller is according to step 2) displacement that presses down that calculates carries out adjustment and puts in place, need after contact to carry out applying pressure, applying pressure size is 35KN.
4) starting device, driving wheel 4 is by carrying out roll forming with the contact friction force to titanium alloy plate of driven pulley 1 and 2, and wherein the roll bending speed of driving wheel 4 is at 12mm/s.
5) in order to reduce resilience, the time marquis of plate end near lower whorl 2, regulate driving wheel 4 to reversely rotate roll bending, carry out four roll bendings back and forth and correct shape, speed is down to 7mm/s.
6), after roll bending completes, roll bending part is carried out welding front pickling processes.
7) due to exist between driven pulley 1 and 2 certain in spacing 80mm, then the part two ends after roll bending certainly exist the first straightway 5 and the second straightway 7 being greater than 40mm value, therefore before welding must recruitment put into row clamping flatten location.
8) at joint 6, the butt welding of docking pulse TIG welding is carried out to the cold breakdown part after clamping pressing.Activity wherein due to titanium alloy is very strong, and weld seam is longer in addition, must carry out general protection by butt welded seam front and back.For nozzle, have selected larger-diameter nozzle, strengthen the protection in molten bath district.Front adopts argon gas to drag cover to carry out available protecting to molten bath, weld seam Ji Jinfeng district, and the weldering bakie that the back side adopts band to blow is protected sealing run and neighbouring high-temperature region.For reaching good protected effect, the flow of each road argon gas and flow velocity will be selected suitably, should available protecting high-temperature region, are unlikely to again excessive and produce turbulent flow.Docking pulse TIG welding takes impulse welding to weld, in tungsten electrode diameter of phi 2.4, under the prerequisite that dutycycle 50% is certain, mainly carry out Proper Match between the parameters such as welding current, speed of welding and wire feed rate, obtain technological specification and the parameter of 2mm thick titanium alloy plate docking pulse TIG welding, as shown in table 2.
Table 2 docks automatic TIG welding parameter
9) because the cylindrical element 8 after welding exists distortion, and there is the first straightway 5 and the second straightway 7 in butt welding place of cold breakdown part, therefore need to carry out hot school shape and stabilization processes to cylindrical element 8, cylindrical element is packed on tubular hot school shape mould 9, hot school shape technological parameter: to give fixed mold external diameter for benchmark, shove charge under normal temperature, is heated to 800 ± 5 DEG C of insulation 120min, cools to less than 150 DEG C with the furnace and come out of the stove.Wherein, hot school shape mould 9 there are 2 play hanging, convenient lifting and transport; For ease for the treatment of that school shape part is enclosed within cylinder, one chamfering being set in cylinder one end, leaving seam at the cylinder other end simultaneously, be convenient to part location.Wherein, consider the condition that titanium alloy shaping dies material should have, select stainless steel 1Cr18Ni9Ti as the material of Thermal expansion mould.This material all has stable non-oxidizability, running hours in the air of 800 DEG C ~ less than 900 DEG C, and steel is stable below 900 DEG C, and under frequent alternating hot and cold condition during interrupter duty, is also stable below 800 DEG C.
10) part after heat treatment is carried out pickling processes.
11) butt welded seam has carried out X-ray examination, meets design weld seam class requirement.
12) detect spare part outside measurement, meet design requirement.
13) be delivered for use.
As can be seen from technique scheme, the present invention by novel, reasonably spread material calculates, driving wheel presses down that bit shift compensation calculates, the combination process of electron beam butt welding and hot school shape stabilization processes, achieve common cold breakdown machine and can realize the curved Accurate Shaping of a kind of titanium alloy fuel tank shell cold breakdown, instead of existing titanium alloy and divide half heat forming technology, greatly save the process allowance required for heat forming technology and machined sequence; The precision form flow process of whole fuel tank shell substantially increases production efficiency and reduces manufacturing cost.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (7)
1. a titanium alloy fuel tank shell manufacturing process, is characterized in that, comprises the following steps:
Step one: by titanium alloy fuel tank shell neutral line theoretical diameter Size calculation part spread material shape, and along the machine direction blanking of rolling blank, obtain dull and stereotyped plate;
Step 2: according to the structural parameters determination fuel tank shell cold breakdown bend diameter of cold breakdown machine;
Step 3: utilize cold breakdown machine to carry out roll forming according to fuel tank shell cold breakdown bend diameter to dull and stereotyped plate;
Step 4: docking welding is carried out to the plate of roll forming;
Step 5: hot school shape and stabilization processes are carried out to the cylindrical element that welding is formed.
2. titanium alloy fuel tank shell manufacturing process as claimed in claim 1, it is characterized in that, in described step 2, described cold breakdown machine comprises the first bottom roller, the second bottom roller and upper roller, and upper roller is driving wheel, and external diameter is R2; First bottom roller and the second bottom roller are driven pulleys, and external diameter is equal, and external diameter is R1; Centre distance between two driven pulleys is 2a; The curved internal diameter of fuel tank shell cold breakdown is that R, R are greater than R2; The thickness of dull and stereotyped plate is h, and start contact point as zero point using upper roller and dull and stereotyped plate, pressing down displacement is S; The depression distance of springback compensation is 1.0h ~ 2.0h, then upper roller presses down the relational expression of displacement S and radius of curvature R and is:
3. titanium alloy fuel tank shell manufacturing process as claimed in claim 2, it is characterized in that, in described step 3, in roll forming process, using the machine direction of described dull and stereotyped plate as feed direction, the front end of plate contacts rear stopping with the peak of the first bottom roller, upper roller is regulated to contact with plate, the depression distance of upper roller puts in place according to the adjustment of S value, contacts after-applied pressure, and applying pressure size is 20KN ~ 40KN.
4. titanium alloy fuel tank shell manufacturing process as claimed in claim 3, it is characterized in that, in described step 3, cold breakdown machine is in plate roll forming process, upper roller is by carrying out roll forming with the first bottom roller and the second bottom roller to the contact friction force of titanium alloy plate, and wherein the roll bending speed of driving wheel is 10 ~ 15mm/s.
5. titanium alloy fuel tank shell manufacturing process as claimed in claim 4, it is characterized in that, in described step 3, cold breakdown machine is in plate roll forming process, plate end near the second bottom roller time, regulate driving wheel to reversely rotate roll bending, carry out four roll bendings back and forth and correct shape, speed is down to 5 ~ 8mm/s.
6. the titanium alloy fuel tank shell manufacturing process according to any one of claim 1-5, it is characterized in that, in described step 4, first put into go to clamp to flatten to part two ends recruitment after roll bending and locate, then at joint, the butt welding of docking pulse TIG welding is carried out to the cold breakdown part after clamping pressing.
7. titanium alloy fuel tank shell manufacturing process as claimed in claim 6, it is characterized in that, in described step 5, the cylindrical element of welding forming is packed on the shape mould of tubular hot school, to give fixed mold external diameter for benchmark, shove charge under normal temperature, is heated to 800 ± 5 DEG C of insulation 120min, cools to less than 150 DEG C with the furnace and come out of the stove.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105665488A (en) * | 2016-02-25 | 2016-06-15 | 成都飞机工业（集团）有限责任公司 | Controlling method for residual stress on outer surface of roll bending skin |
| CN105690043A (en) * | 2016-04-19 | 2016-06-22 | 山东泰开特变有限公司 | Welding production process for distribution transform fuel tank |
| CN106450419A (en) * | 2016-11-25 | 2017-02-22 | 惠州市恒泰科技股份有限公司 | Arc-shaped battery rolling former |
| CN106964691A (en) * | 2017-04-14 | 2017-07-21 | 武汉理工大学 | A kind of band grid ribs Cylinder shape constructional element flexible compound manufacturing process |
| CN110102636A (en) * | 2019-05-08 | 2019-08-09 | 沈阳航天新光集团有限公司 | The method for improving low pressure explosion piece manufacture stability |
| CN110480260A (en) * | 2019-07-23 | 2019-11-22 | 上海航天精密机械研究所 | A kind of large diameter thin wall annular titanium alloy tube preparation method |
| CN111716078A (en) * | 2019-03-22 | 2020-09-29 | 上海梅山钢铁股份有限公司 | Plasma welding method for straight seam of thin-wall cylindrical steel shell |
| CN112588908A (en) * | 2020-12-12 | 2021-04-02 | 江西洪都航空工业集团有限责任公司 | Forming device and method for reinforcing rib parts of aircraft fuel tank |
| CN113560826A (en) * | 2021-08-13 | 2021-10-29 | 燕山大学 | Welded pipe forming method for comprehensively controlling springback through warm forming and light over bending |
| CN114210797A (en) * | 2021-12-17 | 2022-03-22 | 湖北三江航天红阳机电有限公司 | Arc pre-bending and shape correcting method for titanium alloy cylindrical skin |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105665488A (en) * | 2016-02-25 | 2016-06-15 | 成都飞机工业（集团）有限责任公司 | Controlling method for residual stress on outer surface of roll bending skin |
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| CN106450419A (en) * | 2016-11-25 | 2017-02-22 | 惠州市恒泰科技股份有限公司 | Arc-shaped battery rolling former |
| CN106450419B (en) * | 2016-11-25 | 2024-03-29 | 惠州市恒泰科技股份有限公司 | Arc battery roll forming machine |
| CN106964691A (en) * | 2017-04-14 | 2017-07-21 | 武汉理工大学 | A kind of band grid ribs Cylinder shape constructional element flexible compound manufacturing process |
| CN106964691B (en) * | 2017-04-14 | 2018-05-01 | 武汉理工大学 | A kind of band grid ribs Cylinder shape constructional element flexible compound manufacturing process |
| CN111716078A (en) * | 2019-03-22 | 2020-09-29 | 上海梅山钢铁股份有限公司 | Plasma welding method for straight seam of thin-wall cylindrical steel shell |
| CN110102636A (en) * | 2019-05-08 | 2019-08-09 | 沈阳航天新光集团有限公司 | The method for improving low pressure explosion piece manufacture stability |
| CN110480260A (en) * | 2019-07-23 | 2019-11-22 | 上海航天精密机械研究所 | A kind of large diameter thin wall annular titanium alloy tube preparation method |
| CN112588908A (en) * | 2020-12-12 | 2021-04-02 | 江西洪都航空工业集团有限责任公司 | Forming device and method for reinforcing rib parts of aircraft fuel tank |
| CN113560826A (en) * | 2021-08-13 | 2021-10-29 | 燕山大学 | Welded pipe forming method for comprehensively controlling springback through warm forming and light over bending |
| CN114210797A (en) * | 2021-12-17 | 2022-03-22 | 湖北三江航天红阳机电有限公司 | Arc pre-bending and shape correcting method for titanium alloy cylindrical skin |
| CN114210797B (en) * | 2021-12-17 | 2023-11-14 | 湖北三江航天红阳机电有限公司 | Arc pre-bending and shape correcting method for titanium alloy cylindrical skin |
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Application publication date: 20151111 |