CN102489591A - Method for thermally bulging aluminium alloy rectangular ring rolled piece - Google Patents
Method for thermally bulging aluminium alloy rectangular ring rolled piece Download PDFInfo
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- CN102489591A CN102489591A CN2011103776576A CN201110377657A CN102489591A CN 102489591 A CN102489591 A CN 102489591A CN 2011103776576 A CN2011103776576 A CN 2011103776576A CN 201110377657 A CN201110377657 A CN 201110377657A CN 102489591 A CN102489591 A CN 102489591A
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Abstract
The invention discloses a method for thermally bulging an aluminium alloy rectangular ring rolled piece. The method comprises the following steps: sleeving a hot rolled aluminium alloy rectangular ring rolled piece on the peripheries of preheated bulging blocks in a bulging machine and starting the bulging machine to ensure the bulging blocks to radially extrude the ring rolled piece from the inner circumferential surface of the ring rolled piece to complete first bulging, wherein the bulging temperature is 330-400 DEG C, the bulging time is 15-20 seconds, the dwell time is 12-14 seconds and the deformation amount is 0.5-0.9%; then ensuring the ring rolled piece to rotate 45 degrees along a central axis to complete first rotation; later, carrying out second bulging according to the above operations, wherein the bulging temperature is 290-350 DEG, the bulging time is 18-30 seconds, the dwell time is 13-16 seconds and the deformation amount is 0.6-1%; rotating the ring rolled piece again in the first rotation direction to complete second rotation; and then carrying out third bulging according to the above operations, wherein the bulging temperature is 250-320 DEG C, the bulging time is 25-35 seconds, the dwell time is 20-23 seconds and the deformation amount is 0.6-1.1%. The dimensional accuracy of the bulged ring rolled piece can be 1-2 per mill of the corresponding dimension. The method is mainly used in the fields such as aerospace.
Description
Technical field
The present invention relates to a kind of expanding method of ring, particularly related to the heat expansion shape method of aluminium alloy straight-flanked ring rolled piece.
Background technology
After aluminium alloy straight-flanked ring rolled piece (referring to that the longitudinal section is the looping mill rolling spare of square-section) adopted looping mill rolling, owing to receive the influence of rolling mill practice and equipment limitation, its dimensional accuracy was generally not high; Only under the situation that looping mill rolling spare shape is more satisfactory and equipment performance is more excellent; Its dimensional accuracy just can reach 3 ‰ of corresponding size～5 ‰ (3/1000ths to 5/1000ths); And the looping mill rolling spare after rolling is because stress is bigger, if in the following process operation, control defectives such as bad easy generation warpage, distortion even cracking.
On February 18th, 2009, disclosed Chinese invention patent specification CN 101367104A disclosed a kind of turbine generator guard ring external fluid infusion hydraulic pressure expanding and reinforcing process; This process is through the peripheral hardware high-pressure pump and make the highly pressurised liquid of its generation pass through the passage in the high pressure cylinder; Inject fixing last prod cast and the mobile following prod cast and the enclosure space of retaining ring formation via the passage that subtracts in the power post in the mould part then; Make retaining ring that plastic deformation take place under the effect of fluid pressure and come the bulging retaining ring; The purpose that strengthen retaining ring to reach, improves the retaining ring forming accuracy can find out that from this patent specification accompanying drawing said retaining ring is the rectangle ring.But this method for how discloses through the dimensional accuracy that bulging improves ring in detail, just generally draws the purpose that can reach raising retaining ring forming accuracy, and promptly this method can not solve the low problem of looping mill rolling spare dimensional accuracy that exists in the prior art.
Summary of the invention
The technical problem that the present invention will solve provides a kind of heat expansion shape method that adopts the bulging piece to realize aluminium alloy straight-flanked ring rolled piece; This method is carried out bulging through continuous three small deformation amounts to said aluminium alloy straight-flanked ring rolled piece, has obtained the high bulging looping mill rolling spare of dimensional accuracy.
For solving the problems of the technologies described above, the heat expansion shape method of aluminium alloy straight-flanked ring rolled piece according to the invention, its technical scheme may further comprise the steps:
Put into the bulging machine to hot rolling aluminium alloy straight-flanked ring rolled piece cover, its inner ring surface is enclosed within through being preheating to the outer circumference surface periphery of 250 ℃～300 ℃ bulging piece, at this moment, radial slider is in closes up state;
Starting the bulging machine applies axial tension F to the mandrel slide block and it is moved down vertically and along the endoporus conical surface extruding radial slide block of said radial slider each radial slider is radially spread with moved further; Be contained in bulging piece on the radial slider outer circumference surface from the inner circumferential surface of looping mill rolling spare extrusion ring rolled piece radially; The plastic deformation of size expansion of inside and outside footpath and wall thickness reduction takes place in looping mill rolling spare, accomplishes bulging for the first time; In this bulging process, the bulging temperature of said looping mill rolling spare is 330 ℃～400 ℃, and the bulging time is 15s～20s, and the dwell time is 12s～14s, and the bulging deflection is 0.5%～0.9%;
The bulging machine drives the mandrel slide block and in radial slider, moves up vertically; And the driving radial slider is radially closed up the looping mill rolling spare that makes after the bulging piece breaks away from bulging with moved further; Deflector roll on the workbench of startup bulging machine makes it drive said looping mill rolling spare along 45 ° of central axis rotations, accomplishes the rotation first time of looping mill rolling spare;
By above-mentioned first time bulging operation to carrying out the bulging second time through the looping mill rolling spare behind the bulging for the first time; In this bulging process, the bulging temperature of said looping mill rolling spare is 290 ℃～350 ℃, and the bulging time is 18s～30s; Dwell time is 13s～16s, and the bulging deflection is 0.6%～1%;
By the operation of above-mentioned first time of rotation to carrying out rotation second time through the looping mill rolling spare behind the bulging for the second time, this rotation, said looping mill rolling spare with the first time direction of rotation rotate 45 ° in the same way again;
By above-mentioned first time bulging operation to carrying out bulging for the third time through the looping mill rolling spare behind the bulging for the second time; In this bulging process, the bulging temperature of said looping mill rolling spare is 250 ℃～320 ℃, and the bulging time is 25s～35s; Dwell time is 20s～23s, and the bulging deflection is 0.6%～1.1%;
After bulging finished, the mandrel slide block that moves up closed up radial slider, took out the looping mill rolling spare behind bulging.
The above-mentioned aluminium alloy preferred material trade mark is the aluminium alloy of 2618A.
The axial tension F that said bulging machine applies the mandrel slide block is calculated as follows definite:
F＝ξ×σ
0.2×S
In the formula:
ξ---bulging machine bulge coefficient, the present invention gets 1.26～1.52;
σ
0.2---the yield strength of aluminum alloy materials (MPa) under the bulging temperature, the 2618A alloy is got 110MPa～160MPa;
Longitudinal section area (the mm of S---looping mill rolling spare
2).
Said looping mill rolling spare calculates by following formula at the bulging size under hot to be confirmed:
D＝D
0(1+β
t)+d
In the formula:
D---looping mill rolling spare is through being in the internal diameter size (mm) under hot behind the bulging;
D
0---looping mill rolling spare is through being in the final products internal diameter size (mm) under the cold conditions behind the bulging;
β
t---the temperature compensation coefficient (%) of looping mill rolling spare under the bulging temperature, the 2618A alloy gets 0.7%～1%;
D---the springback capacity of internal diameter size (mm) behind the looping mill rolling spare bulging, the 2618A alloy is got 2mm～8mm.
Adopt the aluminium alloy straight-flanked ring rolled piece of heat expansion shape method bulging according to the invention, its internal diameter size scope is Ф 400mm～Ф 4500mm, and wall thickness is 10mm～200mm, highly is 40mm～750mm.
Compared with prior art, beneficial effect of the present invention is following:
The present invention carries out rigidity through bulging piece on the bulging machine and aluminium alloy straight-flanked ring rolled piece and contacts direct bulging, can obtain needed bulging size and help improving dimensional accuracy.
The present invention carries out bulging through three small deformation amounts; And through selecting suitable technological parameters such as bulging temperature, bulging time and dwell time; Thereby can guarantee that aluminium alloy straight-flanked ring rolled piece can not produce dynamic recrystallization in the bulging process; Can the tissue of looping mill rolling spare not exerted an influence, the spalling phenomenon can not occur, can also make behind each bulging the springback capacity of looping mill rolling spare less; And in the bulging process through rotating 45 ° to said looping mill rolling spare for twice in the same way; The vestige that gap in the time of can eliminating the bulging piece and radially spread bulging between the adjacent bulging piece forms looping mill rolling spare inner peripheral surface, thus help carrying out smoothly and obtaining the higher bulging looping mill rolling spare of dimensional accuracy of bulging process; In whole bulging process; Because the bulging piece is the springback capacity of internal diameter size behind situation of change and the each bulging of measurement ring rolled piece internal diameter size in real time; And in time be sent to measurement data on the display of bulging machine, thereby when bulging the accurate bulging size of control loop rolled piece.In sum, adopt the looping mill rolling spare of the method for the invention bulging can obtain the higher final products size of dimensional accuracy.
In the bulging process, because bulging machine axial tension F that the mandrel slide block is applied is by YIELD STRENGTH (σ under the bulge coefficient (ξ) of bulging machine, the bulging temperature
0.2) and the longitudinal section area (S) of looping mill rolling spare confirm; Therefore; The looping mill rolling spare that can be directed against different bulging machines and different materials, size is confirmed the size of axial tension F; Make that looping mill rolling spare is stressed in the bulging process more evenly rationally can to guarantee carrying out smoothly of bulging process, avoid exerting oneself excessively causing spalling or the too small motionless phenomenon that expands that causes of exerting oneself takes place.
The hot bulging internal diameter size (D) of said bulging looping mill rolling spare by looping mill rolling spare through being in the final products internal diameter size (D under the cold conditions behind the bulging
0), the temperature compensation coefficient (β of looping mill rolling spare under the bulging temperature
t) and looping mill rolling spare bulging after the springback capacity (d) of internal diameter size calculate definite; Thereby the accurate thermal state sizes of control loop rolled piece when bulging, and to obtain the high cold conditions size of dimensional accuracy in bulging looping mill rolling spare cooling back be the final products size of looping mill rolling spare behind bulging.
The present invention just from the looping mill the aluminium alloy straight-flanked ring rolled piece of roll forming carry out bulging while hot; Not only its waste heat energy enough satisfies the needs of bulging temperature; And can avoid the cooling of looping mill rolling spare to shrink the phenomenon that back stress further increases, bulging helps before looping mill rolling spare stress increases, reducing the influence of stress to looping mill rolling spare dimensional accuracy while hot.Bulging can also reduce the operation that reheats while hot, energy savings with raise labour productivity.And, preheating bulging piece, temperature reduces too fastly in the time of can also avoiding said looping mill rolling spare bulging, influences the bulging temperature parameter.
The aluminium alloy straight-flanked ring rolled piece that with the trade mark is 2618A is an example, and the cold conditions size of this alloy straight-flanked ring rolled piece after detecting bulging is the final products sizes, has reached 1 ‰ of corresponding size～2 ‰; Through detecting the interior tissue of this looping mill rolling spare, any variation does not take place, and do not have defectives such as distortion, warpage.
Description of drawings
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is done further explain.
Fig. 1 is the profilograph of hot rolling straight-flanked ring rolled piece along its center line.
Fig. 2 is the structure diagram of bulging machine.
Fig. 3 is the installation sketch map of hot rolling straight-flanked ring rolled piece.
Fig. 4 is the heat expansion shape process sketch map of hot rolling straight-flanked ring rolled piece.
Fig. 5 is the sketch map of the straight-flanked ring rolled piece behind the bulging piece disengaging bulging.
The specific embodiment
The heat expansion shape method of the described aluminium alloy straight-flanked ring of embodiment of the present invention rolled piece need provide equipment such as bulging machine, manipulator.Be that the aluminium alloy of 2618A is the specific embodiment that example specifies this method with China's material trademark below:
The main chemical elements content (percentage by weight) of this alloy is: si content 0.15%～0.25%, contain Fe amount 0.9%～1.4%, contain Cu amount 1.8%～2.7%, contain Mn amount≤0.25%, contain Mg amount 1.2%～1.8%, ni content 0.8%～1.4%, contain Zn amount≤0.15%, contain Ti+Zr amount≤0.25%, contain Ti amount≤0.20%, other elements add up to≤0.15%, surplus is Al.
The structure diagram of bulging machine that is used for the said heat expansion shape of embodiment of the present invention method is as shown in Figure 2, and this bulging machine mainly is made up of mandrel slide block 1, radial slider 2, bulging piece 3, workbench 4 and guide rail 5.Mandrel slide block 1 is conical and is sleeved in the radial slider 2 and cooperates with the taper inner peripheral surface of radial slider 2, and mandrel slide block 1 can be driven by the hydraulic cylinder of bulging machine and in radial slider 2, move up and down vertically and extruding radial slide block 2; Radial slider 2 is installed on the guide rail 5 of bulging machine and can radially moves around along guide rail 5; Radial slider 2 is overlooked direction from Fig. 2 and is seen it is 12 secter pat shapes of separating; Be installed with bulging piece 3 on the outer circumference surface of each secter pat respectively, can form a toroidal with bulging piece 3 when each secter pat closes up; , mandrel slide block 1 can make each radial slider 2 radially make bulging piece 3 reach the purpose of bulging ring when moving down in radial slider 2 vertically with the moved further diffusion; The bulging machine can drive each radial slider 2 and radially closes up the ring that makes after bulging piece 3 breaks away from bulgings with moved further when mandrel slide block 1 moves up in radial slider 2 vertically, and bulging piece 3 has real-time measurement ring internal diameter size and is sent to measurement data the function on the display of bulging machine in the bulging process; In addition, on the workbench 4 of this bulging machine, can drive the deflector roll (not shown) of ring in addition in this workbench upper edge central axis rotation.
This alloy is following from being rolled into the processing step that carries out heat expansion shape behind the straight-flanked ring rolled piece:
Step 1: installation.
As shown in Figure 3; Earlier be preheating to 250 ℃～300 ℃ to the bulging piece 3 on the bulging machine; Again just from the looping mill the 2618A alloy straight-flanked ring rolled piece 10 as shown in Figure 1 of roll forming overlap while hot and puts into the bulging machine, make its inner ring surface be enclosed within the outer circumference surface periphery of bulging piece 3, its bottom surface lie in workbench 4 above; At this moment, radial slider 2 is in and closes up state.The shipment of workpiece is mainly accomplished through Robot actions during installation.
Step 2: bulging for the first time.
As shown in Figure 4, start the bulging machine its mandrel slide block 1 is axially moved down along it, mandrel slide block 1 radially spreads each radial slider 2 along its taper surface extruding radial slide block 2 in radial slider 2 with moved further; The outer circumference surface of the bulging piece 3 on the radial slider 2 contacts with the inner circumferential surface of looping mill rolling spare 10; And, make looping mill rolling spare 10 from the inner circumferential surface to the external peripheral surface, receive radial compression power from bulging piece 3 along the inner circumferential surface extrusion ring rolled piece 10 of looping mill rolling spare 10, cause the inner peripheral surface of looping mill rolling spare 10 radially to enlarge; Inside and outside footpath size takes place and enlarges in looping mill rolling spare 10; The plastic deformation of wall thickness reduction, looping mill rolling spare 10 is by bulging piece bulging 3 first time, and the hydraulic cylinder of bulging machine applies axial tension F to mandrel slide block 1 during bulging; The bulging temperature of looping mill rolling spare 10 is 330 ℃～400 ℃; The bulging time is 15s～20s, and the dwell time is 12s～14s, and the bulging deflection of looping mill rolling spare 10 is 0.5%～0.9%.
The said bulging time is the time after looping mill rolling spare 10 is finished to bulging by bulging from the beginning; The said dwell time is meant that looping mill rolling spare 10 is reached by bulging and no longer deforms behind the deflection and remain to the time that bulging finishes always.
Step 3: rotation for the first time.
As shown in Figure 5; Making the bulging machine drive mandrel slide block 1 moves up in radial slider 2 vertically; And driving radial slider 2 is radially closed up the looping mill rolling spare 10 that makes after bulging piece 3 breaks away from bulgings with moved further; Start deflector roll on the workbench 4 of bulging machine and make its driving ring rolled piece 10 clockwise or be rotated counterclockwise 45 °, thereby accomplish the rotation first time of looping mill rolling spare 10 at this workbench upper edge central axis.
Step 4: bulging for the second time.
The bulging process of repeating step 1 makes 3 pairs of looping mill rolling spares of bulging piece 10 carry out the bulging second time; The hydraulic cylinder of bulging machine applies axial tension F to mandrel slide block 1 during bulging; The bulging temperature of looping mill rolling spare 10 is 290 ℃～350 ℃; The bulging time is 18s～30s, and the dwell time is 13s～16s, and the bulging deflection of looping mill rolling spare 10 is 0.6%～1%.
Step 5: rotation for the second time.
Repeating step 3 makes the deflector roll driving ring rolled piece 10 of bulging machine and direction of rotation for the first time rotate 45 ° in the same way again, thereby accomplishes the rotation second time of looping mill rolling spare 10.
Step 6: bulging for the third time.
The bulging process of repeating step 1 makes 3 pairs of looping mill rolling spares of bulging piece 10 carry out bulging for the third time; The hydraulic cylinder of bulging machine applies axial tension F to mandrel slide block 1 during bulging; The bulging temperature of looping mill rolling spare 10 is 250 ℃～320 ℃; The bulging time is 25s～35s, and the dwell time is 20s～23s, and the bulging deflection of looping mill rolling spare 10 is 0.6%～1.1%.
After three times bulging finished, the mandrel slide block 1 that moves up closed up radial slider 2 and makes bulging piece 3 break away from looping mill rolling spare 10, accomplishes the bulging process thereby take out looping mill rolling spare 10 with manipulator.
Looping mill rolling spare 10 is in the bulging process, and said axial tension F is calculated as follows:
F＝ξ×σ
0.2×S
In the formula:
ξ---bulging machine bulge coefficient, the present invention gets 1.26～1.52;
σ
0.2---the yield strength of aluminum alloy materials (MPa) under the bulging temperature, the present invention gets 110MPa～160MPa;
Longitudinal section area (the mm of S---looping mill rolling spare 10
2);
The computational methods of the bulging deflection of said looping mill rolling spare 10 are: bulging deflection=[the middle footpath size of looping mill rolling spare 10 before (the middle footpath size of the preceding looping mill rolling spare 10 of the middle footpath size-bulging of looping mill rolling spare 10 behind the bulging)/bulging] * 100%.
The middle footpath size of said looping mill rolling spare 10=(outside dimension of the internal diameter size of looping mill rolling spare 10+looping mill rolling spare 10) ÷ 2
For guaranteeing that said looping mill rolling spare 10 can access the final size of product requirement behind bulging, looping mill rolling spare 10 calculates by following formula at the bulging size under hot:
D＝D
0(1+β
t)+d
In the formula:
D---looping mill rolling spare 10 is through being in the internal diameter size (mm) under hot behind the bulging;
D
0---looping mill rolling spare 10 is through being in the final products internal diameter size (mm) under the cold conditions behind the bulging;
β
t---the temperature compensation coefficient (%) of looping mill rolling spare 10 under the bulging temperature, different for the temperature compensation coefficient of material different under different temperatures, the present invention gets 0.7%～1%;
The springback capacity (mm) of internal diameter size behind d---looping mill rolling spare 10 bulgings, the present invention gets 2mm～8mm.
Adopt the aluminium alloy straight-flanked ring rolled piece of said method bulging, its internal diameter size scope is: Ф 400mm～Ф 4500mm, wall thickness are 10mm～200mm, highly are 40mm～750mm.
Claims (5)
1. the heat expansion shape method of an aluminium alloy straight-flanked ring rolled piece is characterized in that, may further comprise the steps:
Put into the bulging machine to hot rolling aluminium alloy straight-flanked ring rolled piece cover, its inner ring surface is enclosed within through being preheating to the outer circumference surface periphery of 250 ℃～300 ℃ bulging piece, at this moment, radial slider is in closes up state;
Starting the bulging machine applies axial tension F to the mandrel slide block and it is moved down vertically and along the endoporus conical surface extruding radial slide block of said radial slider each radial slider is radially spread with moved further; The bulging piece that is contained on the radial slider outer circumference surface radially pushes this looping mill rolling spare from the inner circumferential surface of looping mill rolling spare; Inside and outside footpath size takes place and enlarges and the wall thickness reduction plastic deformation in looping mill rolling spare, accomplishes bulging for the first time; In this bulging process, the bulging temperature of said looping mill rolling spare is 330 ℃～400 ℃, and the bulging time is 15s～20s, and the dwell time is 12s～14s, and the bulging deflection is 0.5%～0.9%;
The bulging machine drives the mandrel slide block and in radial slider, moves up vertically; And the driving radial slider is radially closed up the looping mill rolling spare that makes after the bulging piece breaks away from bulging with moved further; Deflector roll on the workbench of startup bulging machine makes it drive said looping mill rolling spare along 45 ° of central axis rotations, accomplishes the rotation first time of looping mill rolling spare;
By above-mentioned first time bulging operation to carrying out the bulging second time through the looping mill rolling spare behind the bulging for the first time; In this bulging process, the bulging temperature of said looping mill rolling spare is 290 ℃～350 ℃, and the bulging time is 18s～30s; Dwell time is 13s～16s, and the bulging deflection is 0.6%～1%;
By the operation of above-mentioned first time of rotation to carrying out rotation second time through the looping mill rolling spare behind the bulging for the second time, this rotation, said looping mill rolling spare with the first time direction of rotation rotate 45 ° in the same way again;
By above-mentioned first time bulging operation to carrying out bulging for the third time through the looping mill rolling spare behind the bulging for the second time; In this bulging process, the bulging temperature of said looping mill rolling spare is 250 ℃～320 ℃, and the bulging time is 25s～35s; Dwell time is 20s～23s, and the bulging deflection is 0.6%～1.1%;
After bulging finished, the mandrel slide block that moves up closed up radial slider, took out the looping mill rolling spare behind bulging.
2. the heat expansion shape method of straight-flanked ring rolled piece according to claim 1, it is characterized in that: said aluminium alloy is 2618A.
3. the heat expansion shape method of straight-flanked ring rolled piece according to claim 1 and 2 is characterized in that: the axial tension F that said bulging machine applies the mandrel slide block is calculated as follows definite:
F＝ξ×σ
0.2×S
In the formula:
ξ---bulging machine bulge coefficient, the present invention gets 1.26～1.52;
σ
0.2---the yield strength of aluminum alloy materials (MPa) under the bulging temperature, the 2618A alloy is got 110MPa～160MPa;
Longitudinal section area (the mm of S---looping mill rolling spare
2).
4. the heat expansion shape method of straight-flanked ring rolled piece according to claim 1 and 2 is characterized in that: said looping mill rolling spare calculates by following formula at the bulging size under hot to be confirmed:
D＝D
0(1+β
t)+d
In the formula:
D---looping mill rolling spare is through being in the internal diameter size (mm) under hot behind the bulging;
D
0---looping mill rolling spare is through being in the final products internal diameter size (mm) under the cold conditions behind the bulging;
β
t---the temperature compensation coefficient (%) of looping mill rolling spare under the bulging temperature, the 2618A alloy gets 0.7%～1%;
D---the springback capacity of internal diameter size (mm) behind the looping mill rolling spare bulging, the 2618A alloy is got 2mm～8mm.
5. the heat expansion shape method of straight-flanked ring rolled piece according to claim 1 and 2 is characterized in that: the straight-flanked ring rolled piece of said bulging, its internal diameter size scope are Ф 400mm～Φ 4500mm, and wall thickness is 10mm～200mm, highly are 40mm～750mm.
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|---|---|---|---|
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|---|---|---|---|
| CN201110377657.6A CN102489591B (en) | 2011-11-24 | 2011-11-24 | Method for thermally bulging aluminium alloy rectangular ring rolled piece |
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| CN1061546A (en) * | 1990-11-17 | 1992-06-03 | 太原重型机械学院 | The hydraulic expanding-forming device of annular work piece |
| JP2001334318A (en) * | 2000-05-23 | 2001-12-04 | Aisin Takaoka Ltd | Nozzle for hydroforming |
| EP1537921A1 (en) * | 2003-12-05 | 2005-06-08 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Method of manufacturing a multi-layer tube for guiding heat transfer fluids and multi-layer tube |
| CN1943901A (en) * | 2006-10-13 | 2007-04-11 | 燕山大学 | Rotary shell part hydraulic expansion integrating device |
| CN101367104A (en) * | 2008-10-10 | 2009-02-18 | 沈阳重型机械集团有限责任公司 | Shroud ring external fluid infusion hydraulic pressure expanding and reinforcing process for turbine generator |
| US7559142B2 (en) * | 2006-09-26 | 2009-07-14 | Pratt & Whitney Canada Corp. | Method of manufacturing a heat shield for a fuel manifold |
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2011
- 2011-11-24 CN CN201110377657.6A patent/CN102489591B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE685462A (en) * | 1965-08-12 | 1967-01-16 | ||
| CN1042321A (en) * | 1988-11-02 | 1990-05-23 | 太原重型机械学院 | The hydraulic expansion method of annular work piece and device thereof |
| CN1061546A (en) * | 1990-11-17 | 1992-06-03 | 太原重型机械学院 | The hydraulic expanding-forming device of annular work piece |
| JP2001334318A (en) * | 2000-05-23 | 2001-12-04 | Aisin Takaoka Ltd | Nozzle for hydroforming |
| EP1537921A1 (en) * | 2003-12-05 | 2005-06-08 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Method of manufacturing a multi-layer tube for guiding heat transfer fluids and multi-layer tube |
| US7559142B2 (en) * | 2006-09-26 | 2009-07-14 | Pratt & Whitney Canada Corp. | Method of manufacturing a heat shield for a fuel manifold |
| CN1943901A (en) * | 2006-10-13 | 2007-04-11 | 燕山大学 | Rotary shell part hydraulic expansion integrating device |
| CN101367104A (en) * | 2008-10-10 | 2009-02-18 | 沈阳重型机械集团有限责任公司 | Shroud ring external fluid infusion hydraulic pressure expanding and reinforcing process for turbine generator |
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| CN102489591B (en) | 2014-04-02 |
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