CN102489590A - Cold bulging method for rectangular aluminium alloy rolled ring - Google Patents
Cold bulging method for rectangular aluminium alloy rolled ring Download PDFInfo
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- CN102489590A CN102489590A CN2011103770029A CN201110377002A CN102489590A CN 102489590 A CN102489590 A CN 102489590A CN 2011103770029 A CN2011103770029 A CN 2011103770029A CN 201110377002 A CN201110377002 A CN 201110377002A CN 102489590 A CN102489590 A CN 102489590A
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Abstract
The invention discloses a cold bulging method for a rectangular aluminium alloy rolled ring. The cold bulging method comprises the following steps of: sleeving a rectangular aluminium alloy cold-rolled ring at the periphery of a bulging block of a bulging machine, starting the bulging machine so that the bulging block extrudes the rolled ring along the radial direction on the surface of the inner circumference of the rolled ring to complete primary bulging, wherein the bulging time is 25-35s, the pressure holding time is 20-22s, and the deformation amount of bulging is 1.4%-1.6%; then leading the rolled ring to rotate by 45 degrees along a central axis to complete primary rotation; afterwards, carrying out secondary bulging according to the operation, wherein the bulging time is 28-38s, the pressure holding time is 24-26s, and the deformation amount of bulging is 1.2%-1.4%; rotating the rolled ring again to complete secondary rotation according to the primary rotation direction; carrying out third bulging according to the operation, wherein the bulging time is 32-42s, the pressure holding time is 28-30s, and the bulging amount is determined according to the size of inner diameter of the rolled ring after secondary bulging and the size of the inner diameter of the final product. The dimensional accuracy of the bulged rolled ring can reach 0.1% of the corresponding dimension; and the bulged rolled ring is mainly applied to the fields of aerospace and the like.
Description
Technical field
The present invention relates to a kind of expanding method of ring, particularly related to the cold expanding 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.This method is owing to be to lean on liquid to contact cold expanding shape rectangle ring with the flexibility of the inner peripheral surface of ring, and it strengthens retaining ring is limited with the ability that improves the retaining ring forming accuracy; And this method for how also discloses through the dimensional accuracy that bulging improves ring in detail; Just generally draw the purpose that can reach raising retaining ring forming accuracy, 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 cold expanding shape method that adopts the bulging piece to realize aluminium alloy straight-flanked ring rolled piece; This method is carried out bulging through double small deformation amount and single compensation bulging 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 cold expanding 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 cold rolling aluminium alloy straight-flanked ring rolled piece cover, make its inner ring surface be enclosed within the outer circumference surface periphery of 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 time of said looping mill rolling spare is 25～35s, and the dwell time is 20～22s, and the bulging deflection is 1.4%～1.6%;
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 time of said looping mill rolling spare is 28～38s, the dwell time is 24～26s, the bulging deflection is 1.2%～1.4%;
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 time of said looping mill rolling spare is 32～42s; Dwell time is 28～30s, and the internal diameter size of the looping mill rolling spare that the bulging amount is measured according to bulging piece behind the second time bulging and the gap of final products internal diameter size are confirmed;
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 (MPa) of aluminum alloy materials, 2618A gets 350MPa～400MPa;
Longitudinal section area (the mm of S---looping mill rolling spare
2).
The bulging size of said looping mill rolling spare calculates by following formula to be confirmed:
D＝D
0+d
In the formula:
The internal diameter size (mm) of D---looping mill rolling spare behind bulging;
D
0---the final products internal diameter size (mm) of looping mill rolling spare;
D---the springback capacity of internal diameter size (mm) behind the looping mill rolling spare bulging, the present invention gets 5～10mm.
Adopt the aluminium alloy straight-flanked ring rolled piece of cold expanding 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 further improve the strengthening effect of bulging, and can obtain needed bulging size and help improving dimensional accuracy aluminium alloy straight-flanked ring rolled piece.
The present invention carries out bulging through double small deformation amount and single compensation bulging to said aluminium alloy straight-flanked ring rolled piece; And through selecting technological parameters such as suitable bulging time and dwell time; Can guarantee that aluminium alloy straight-flanked ring rolled piece the spalling phenomenon can not occur in the bulging process, can also make that the springback capacity of looping mill rolling spare is unlikely to too big behind each bulging; In the bulging process through rotating 45 ° to said looping mill rolling spare for twice in the same way; Gap in the time of can eliminating the bulging piece and radially spread bulging between the adjacent bulging piece is to the vestige that looping mill rolling spare inner peripheral surface forms, and helps carrying out smoothly and obtaining the higher bulging looping mill rolling spare of dimensional accuracy of bulging process; Because the bulging internal diameter size (D) of looping mill rolling spare is by the final products internal diameter size (D of looping mill rolling spare behind bulging
0) and looping mill rolling spare bulging after the springback capacity (d) of internal diameter size calculate definite; The springback capacity of looping mill rolling spare is bigger when adding cold expanding shape; Looping mill rolling spare still has a small amount of springback capacity through the second time behind the bulging, therefore, has carried out compensating for the third time bulging; The bulging amount is confirmed according to the internal diameter size of looping mill rolling spare behind the second time bulging and the gap of final products internal diameter size, so that size behind the bulging and final products consistent size; 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 the axial tension F that the bulging machine applies the mandrel slide block is bulge coefficient (ξ), YIELD STRENGTH (σ by the bulging machine
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 aluminium alloy straight-flanked ring rolled piece that with the trade mark is 2618A is an example, and the final products size of this aluminium alloy straight-flanked ring rolled piece after detecting bulging has reached 1 ‰ of corresponding size, and do not had 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 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 straight-flanked ring rolled piece.
Fig. 4 is the cold expanding shape process sketch map of 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 cold expanding 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 Al.
The structure diagram of bulging machine that is used for the said cold expanding 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.
The processing step that this alloy straight-flanked ring rolled piece carries out cold expanding shape is following:
Step 1: installation.
As shown in Figure 3, put into the bulging machines to 2618A alloy straight-flanked ring rolled piece shown in Figure 1 10 cover, it is peripheral to make its inner ring surface be enclosed within the outer circumference surface of bulging piece 3, its bottom surface lie in workbench 4 above, at this moment, radial slider 2 is in 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 radial slider 2 in moved further, and 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 along the inner circumferential surface extrusion ring rolled piece 10 of looping mill rolling spare 10; Make looping mill rolling spare 10 from the inner circumferential surface to the external peripheral surface, receive the radial compression power from bulging piece 3, 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, and the bulging time of looping mill rolling spare 10 is 25～35s; Dwell time is 20～22s, and the bulging deflection of looping mill rolling spare 10 is 1.4%～1.6%.
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 time of looping mill rolling spare 10 is 28～38s; Dwell time is 24～26s, and the bulging deflection of looping mill rolling spare 10 is 1.2%～1.4%.
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 time of looping mill rolling spare 10 is 32～42s; Dwell time is 28～30s, and the internal diameter size of the looping mill rolling spare 10 that the bulging amount is measured according to bulging piece 3 behind the second time bulging and the gap of final products internal diameter size are confirmed.
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 (MPa) of aluminum alloy materials, the present invention gets 350MPa～400MPa;
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 looping mill rolling spare 10 can access the final size of product requirement behind bulging, the bulging size of looping mill rolling spare 10 calculates by following formula:
D＝D
0+d
In the formula:
The internal diameter size (mm) of D---looping mill rolling spare 10 behind bulging;
D
0---the final products internal diameter size (mm) of looping mill rolling spare 10;
The springback capacity (mm) of internal diameter size behind d---looping mill rolling spare 10 bulgings, the present invention gets 5～10mm.
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 cold expanding 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 cold rolling aluminium alloy straight-flanked ring rolled piece cover, make its inner ring surface be enclosed within the outer circumference surface periphery of 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 time of said looping mill rolling spare is 25～35s, and the dwell time is 20～22s, and the bulging deflection is 1.4%～1.6%;
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 time of said looping mill rolling spare is 28～38s, the dwell time is 24～26s, the bulging deflection is 1.2%～1.4%;
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 time of said looping mill rolling spare is 32～42s; Dwell time is 28～30s, and the internal diameter size of the looping mill rolling spare that the bulging amount is measured according to bulging piece behind the second time bulging and the gap of final products internal diameter size are confirmed;
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 cold expanding shape method of straight-flanked ring rolled piece according to claim 1, it is characterized in that: said aluminium alloy is 2618A.
3. the cold expanding 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 (MPa) of aluminum alloy materials, 2618A gets 350MPa～400MPa;
Longitudinal section area (the mm of S---looping mill rolling spare
2).
4. the cold expanding shape method of straight-flanked ring rolled piece according to claim 1 and 2 is characterized in that: the bulging size of said looping mill rolling spare calculates by following formula to be confirmed:
D＝D
0+d
In the formula:
The internal diameter size (mm) of D---looping mill rolling spare behind bulging;
D
0---the final products internal diameter size (mm) of looping mill rolling spare;
D---the springback capacity of internal diameter size (mm) behind the looping mill rolling spare bulging, the present invention gets 5～10mm.
5. the cold expanding 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～Ф 4500mm, and wall thickness is 10mm～200mm, highly are 40mm～750mm.
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|---|---|---|---|
| CN201110377002.9A CN102489590B (en) | 2011-11-24 | 2011-11-24 | Cold bulging method for rectangular aluminium alloy rolled ring |
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|---|---|---|---|
| CN201110377002.9A CN102489590B (en) | 2011-11-24 | 2011-11-24 | Cold bulging method for rectangular aluminium alloy rolled ring |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102825131A (en) * | 2012-09-12 | 2012-12-19 | 上海保捷汽车零部件锻压有限公司 | Deformation strengthening device for generator retaining ring blank |
| CN112877621A (en) * | 2021-01-14 | 2021-06-01 | 西北工业大学 | Cold bulging method for regulating residual stress of aluminum alloy ring piece and improving mechanical property |
| CN114260363A (en) * | 2021-12-16 | 2022-04-01 | 西南铝业（集团）有限责任公司 | Cold bulging method for large-sized special-shaped section ring forging |
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| CN102825131A (en) * | 2012-09-12 | 2012-12-19 | 上海保捷汽车零部件锻压有限公司 | Deformation strengthening device for generator retaining ring blank |
| CN112877621A (en) * | 2021-01-14 | 2021-06-01 | 西北工业大学 | Cold bulging method for regulating residual stress of aluminum alloy ring piece and improving mechanical property |
| CN114260363A (en) * | 2021-12-16 | 2022-04-01 | 西南铝业（集团）有限责任公司 | Cold bulging method for large-sized special-shaped section ring forging |
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|---|---|
| CN102489590B (en) | 2014-04-02 |
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