CN102513457A - Method for forming irregular ring piece by utilizing stainless-steel rectangular ring rolled piece through thermal bulging - Google Patents
Method for forming irregular ring piece by utilizing stainless-steel rectangular ring rolled piece through thermal bulging Download PDFInfo
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- CN102513457A CN102513457A CN2011103779273A CN201110377927A CN102513457A CN 102513457 A CN102513457 A CN 102513457A CN 2011103779273 A CN2011103779273 A CN 2011103779273A CN 201110377927 A CN201110377927 A CN 201110377927A CN 102513457 A CN102513457 A CN 102513457A
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Abstract
The invention discloses a method for forming an irregular ring piece by utilizing a stainless-steel rectangular ring rolled piece through thermal bulging, comprising the following steps of: sleeving the heated stainless-steel rectangular ring rolled piece on the periphery of a pre-heated bulging blockin a bulging machine; starting the bulging machine so that the ring rolled piece is squeezed by the bulging block in a radial direction along the inner circumference surface of the ring rolled piece and becomes the irregular ring blank after being deformed for 11-13%, thus completing primary bulging; rotating the irregular ring blank for 45 degrees along an center axis, thus completing primary rotation; carrying out secondary bulging with the deformation amount of 1.8-2% and secondary rotation on the irregular ring blank according to the previous steps; carrying out tertiary bulging with the deformation amount of 1.4-1.6% and tertiary rotation on the irregular ring blank according to the previous steps; and carrying out quartus bulging with the deformation amount of 1.2-1.4% and quartus rotation on the irregular ring blank according to the previous steps, so as to obtain the irregular ring piece. The size precision of the irregular ring piece can reach 0.1-0.2% of the corresponding size. The irregular ring piece formed by using the method disclosed by the invention is mainly used for 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 method that stainless steel rectangular looping mill rolling spare heat expansion shape is configured as special-shaped ring.
Background technology
After stainless steel rectangular looping mill rolling spare (referring to that the longitudinal section is the looping mill rolling spare of square-section) or special-shaped ring rolled piece (referring to that the longitudinal section is the looping mill rolling spare of non-rectangular cross-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 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 bulging piece that adopts and realizes that stainless steel rectangular looping mill rolling spare heat expansion shape is configured as the method for special-shaped ring; This method is carried out bulging through a large deformation and continuous three small deformations to said stainless steel rectangular looping mill rolling spare, has obtained the high bulging abnormity ring of dimensional accuracy.
For solving the problems of the technologies described above, stainless steel rectangular looping mill rolling spare heat expansion shape according to the invention is configured as the method for special-shaped ring, and its technical scheme may further comprise the steps:
Put into the bulging machine to the stainless steel rectangular looping mill rolling spare cover that is heated to 1090 ℃～1120 ℃; Its inner ring surface is enclosed within through being preheating to the outer circumference surface periphery of 275 ℃～325 ℃ bulging piece; The outer circumference surface of said bulging piece has and the inner peripheral surface of the special-shaped ring of the final expansion forming consistent shape that matches; At this moment, radial slider is in and 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 straight-flanked ring rolled piece from the inner circumferential surface of straight-flanked ring rolled piece; The size expansion of inside and outside footpath takes place in the straight-flanked ring rolled piece and the wall thickness reduction plastic deformation is the special-shaped ring base, accomplishes bulging for the first time; In this bulging process, the bulging temperature of said straight-flanked ring rolled piece is 1090 ℃～1120 ℃, and the bulging time is 28s～38s, and the dwell time is 16s～18s, and the bulging deflection is 11%～13%;
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 special-shaped ring base 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 special-shaped ring base along 45 ° of central axis rotations, accomplishes the rotation first time of special-shaped ring base;
By above-mentioned first time bulging operation to carrying out the bulging second time through the special-shaped ring base behind the bulging for the first time; In this bulging process; The bulging temperature of said special-shaped ring base is 1060 ℃～1090 ℃; The bulging time is 18s～28s, and the dwell time is 9s～12s, and the bulging deflection is 1.8%～2%;
By the operation of above-mentioned first time of rotation to carrying out rotation second time through the special-shaped ring base behind the bulging for the second time, this rotation, said special-shaped ring base 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 special-shaped ring base behind the bulging for the second time; In this bulging process; The bulging temperature of said special-shaped ring base is 1030 ℃～1060 ℃; The bulging time is 18s～28s, and the dwell time is 9s～12s, and the bulging deflection is 1.4%～1.6%;
By the operation of above-mentioned first time of rotation to rotating for the third time through the special-shaped ring base behind the bulging for the second time, this rotation, said special-shaped ring base rotates 45 ° in the same way again with direction of rotation for the first time;
By above-mentioned first time bulging operation to carrying out bulging the 4th time through the special-shaped ring base behind the bulging for the third time; In this bulging process; The bulging temperature of said special-shaped ring base is 1000 ℃～1030 ℃; The bulging time is 28s～38s, and the dwell time is 20s～22s, and the bulging deflection is 1.2%～1.4%;
After bulging finished, the mandrel slide block that moves up closed up radial slider, took out the special-shaped ring behind bulging.
The above-mentioned stainless steel preferred material trade mark is the stainless steel of 1Mn18Cr18N.
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 stainless steel material (MPa) under the bulging temperature, the 1Mn18Cr18N stainless steel is got 180MPa～220MPa;
Longitudinal section area (the mm of S---straight-flanked ring rolled piece or special-shaped ring base
2).
Said special-shaped ring is calculated by following formula at the bulging size under hot and is confirmed:
D＝D
0(1+β
t)+d
In the formula:
D---special-shaped ring is in the internal diameter size (mm) under hot;
D
0---special-shaped ring is in the final products internal diameter size (mm) under the cold conditions;
β
t---the temperature compensation coefficient (%) of alloy material under the bulging temperature, the 1Mn18Cr18N stainless steel gets 1.2%～1.65%;
D---bulging becomes the springback capacity (mm) of internal diameter size after the special-shaped ring, and the 1Mn18Cr18N stainless steel is got 2mm～4mm.
Adopt the special-shaped ring of the method for the invention expansion forming, its internal diameter size scope is Φ 400mm～Φ 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 stainless steel rectangular looping mill rolling spare and contacts that to come direct expansion forming be special-shaped ring, can obtain needed bulging size and help improving dimensional accuracy.
The present invention is through being heated to high temperature to the straight-flanked ring rolled piece; At first be deformed into the special-shaped ring base to straight-flanked ring rolled piece bulging through an aximal deformation value; Be special-shaped ring base expansion forming special-shaped ring through three small deformation amounts again, and, can not produce appreciable impact the tissue of looping mill rolling spare through selecting suitable technological parameters such as bulging temperature, bulging time and dwell time; The spalling phenomenon can not occur, can also make the springback capacity of looping mill rolling spare behind each bulging or special-shaped ring base less; And in the bulging process through rotating 45 ° to said special-shaped ring base for three times 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 special-shaped ring base inner peripheral surface, thus help carrying out smoothly and obtaining the special-shaped ring of the higher bulging of dimensional accuracy of bulging process; In whole bulging process; Because the bulging piece can be measured the springback capacity of internal diameter size behind situation of change and the each bulging of special-shaped ring base internal diameter size in real time; And in time be sent to measurement data on the display of bulging machine, thereby when bulging, can accurately control the bulging size of special-shaped ring rolled piece.In sum, adopt the special-shaped ring rolled piece 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 or special-shaped ring base confirm; Therefore; Can be directed against different bulging machine and different materials, the looping mill rolling spare of size or the sizes that the special-shaped ring base is confirmed 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 the special-shaped ring behind the said bulging by special-shaped ring through being in the final products internal diameter size (D under the cold conditions behind the bulging
0), the temperature compensation coefficient (β of alloy material under the bulging temperature
t) and bulging becomes, and the springback capacity (d) of internal diameter size calculates definite after the special-shaped ring; Thereby when bulging, can accurately control the thermal state sizes of special-shaped ring, and the high cold conditions size of acquisition dimensional accuracy is the final products size of special-shaped ring behind bulging after the special-shaped ring cooling behind the bulging.
The stainless steel bulging abnormity ring that with the trade mark is 1Mn18Cr18N is an example, and the cold conditions size of the special-shaped ring of this stainless steel after detecting bulging is the final products sizes, has reached 1 ‰ of corresponding size～2 ‰; Through detecting the interior tissue of this abnormity ring, marked change 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 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 process sketch map that straight-flanked ring rolled piece heat expansion shape is configured as special-shaped ring.
Fig. 5 is the sketch map of the special-shaped ring behind the bulging piece disengaging bulging.
Fig. 6 is that special-shaped ring behind the bulging is along the profilograph of its center line.
The specific embodiment
The method that the described stainless steel rectangular of embodiment of the present invention looping mill rolling spare heat expansion shape is configured as special-shaped ring need provide equipment such as bulging machine, forge furnace, manipulator.Be that the stainless steel of 1Mn18Cr18N is the specific embodiment that example specifies this method with China's material trademark below:
This stainless main chemical elements content (percentage by weight) is: C content≤0.1%, si content≤0.8%, contain Mn amount 17.5%～20.0%, P content≤0.050%, contain S amount≤0.015%, contain Cr amount 17.5%～20.0%, contain N amount>=0.50%, contain Al amount≤0.025%, contain B amount≤0.001%, surplus is Fe.
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 stainless steel is following from the processing step that straight-flanked ring rolled piece heat expansion shape is configured as special-shaped ring:
Step 1: installation.
As shown in Figure 3; Earlier be preheating to 275 ℃～325 ℃ to the bulging piece 3 on the bulging machine; Cover is put into the bulging machine after being heated to 1090 ℃～1120 ℃ to 1Mn18Cr18N stainless steel rectangular looping mill rolling spare 10 as shown in Figure 1 again; It is peripheral to make its inner ring surface be enclosed within the outer circumference surface of bulging piece 3, and the outer circumference surface of bulging piece 3 has and the inner peripheral surface of the special-shaped ring 20 of the final expansion forming as shown in Figure 6 consistent shape that matches, 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; Starting the bulging machine makes its mandrel slide block 1 axially move 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 is along the inner circumferential surface extruding straight-flanked ring rolled piece 10 of straight-flanked ring rolled piece 10; Make straight-flanked ring rolled piece 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 straight-flanked ring rolled piece 10 radially to enlarge, inside and outside footpath size takes place and enlarges in straight-flanked ring rolled piece 10; The plastic deformation of wall thickness reduction, straight-flanked ring rolled piece 10 is deformed into special-shaped ring base 15 by bulging piece bulging 3 first time.The hydraulic cylinder of bulging machine applies axial tension F to mandrel slide block 1 during bulging; The bulging temperature of straight-flanked ring rolled piece 10 is 1090 ℃～1120 ℃; The bulging time is 28s～38s, and the dwell time is 16s～18s, and the bulging deflection of straight-flanked ring rolled piece 10 is 11%～13%.
The said bulging time is meant the time after straight-flanked ring rolled piece 10 is finished to bulging by bulging from the beginning; The said dwell time is meant that straight-flanked ring rolled piece 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 special-shaped ring base 15 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 it drive special-shaped ring base 15 clockwise or be rotated counterclockwise 45 °, thereby accomplish the rotation first time of special-shaped ring base 15 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 special-shaped ring bases of bulging piece 15 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 special-shaped ring base 15 is 1060 ℃～1090 ℃; The bulging time is 18s～28s, and the dwell time is 9s～12s, and the bulging deflection of special-shaped ring base 15 is 1.8%～2%.
Step 5: rotation for the second time.
Repeating step 3 makes the deflector roll of bulging machine drive special-shaped ring base 15 and rotates 45 ° in the same way again with direction of rotation for the first time, thereby accomplishes the rotation second time of special-shaped ring base 15.
Step 6: bulging for the third time.
The bulging process of repeating step 1 makes 3 pairs of special-shaped ring bases of bulging piece 15 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 special-shaped ring base 15 is 1030 ℃～1060 ℃; The bulging time is 18s～28s, and the dwell time is 9s～12s, and the bulging deflection of special-shaped ring base 15 is 1.4%～1.6%.
Step 7: rotation for the third time.
Repeating step 3 makes the deflector roll of bulging machine drive special-shaped ring base 15 and rotates 45 ° in the same way again with direction of rotation for the second time, thereby accomplishes the rotation for the third time of special-shaped ring base 15.
Step 6: the 4th bulging.
The bulging process of repeating step 1 makes 3 pairs of special-shaped ring bases of bulging piece 15 carry out the 4th bulging to make its final distortion be configured as special-shaped ring 20; The hydraulic cylinder of bulging machine applies axial tension F to mandrel slide block 1 during bulging; The bulging temperature of special-shaped ring base 15 is 1000 ℃～1030 ℃; The bulging time is 28s～38s, and the dwell time is 20s～22s, and the bulging deflection of special-shaped ring base 15 is 1.2%～1.4%.
After four times bulging finished, the mandrel slide block 1 that moves up closed up radial slider 2 and makes bulging piece 3 break away from special-shaped ring 20, accomplishes the bulging process thereby take out special-shaped ring 20 with manipulator.
Said straight-flanked ring rolled piece 10 or special-shaped ring base 15 are 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 stainless steel material (MPa) under the bulging temperature, the present invention gets 180MPa～220MPa;
Longitudinal section area (the mm of S---straight-flanked ring rolled piece 10 or special-shaped ring base 15
2);
The computational methods of the bulging deflection of said straight-flanked ring rolled piece 10 are: the bulging deflection=middle footpath size of straight-flanked ring rolled piece 10 (or special-shaped ring base 15) before [the middle footpath size of straight-flanked ring rolled piece 10 (or special-shaped ring base 15) before the middle footpath size-bulging of straight-flanked ring rolled piece 10 behind the bulging (or special-shaped ring base 15))]/bulging * 100%.
The middle footpath size of said straight-flanked ring rolled piece 10 (or special-shaped ring base 15)=(outside dimension of the internal diameter size+straight-flanked ring rolled piece 10 (or special-shaped ring base 15) of straight-flanked ring rolled piece 10 (or special-shaped ring base 15)) ÷ 2
For guaranteeing that straight-flanked ring rolled piece 10 can access the final size of product requirement after bulging becomes special-shaped ring 20, special-shaped ring 20 is calculated by following formula at the bulging size under hot:
D＝D
0(1+β
t)+d
In the formula:
D---special-shaped ring 20 is in the internal diameter size (mm) under hot;
D
0---special-shaped ring 20 is through being in the final products internal diameter size (mm) under the cold conditions;
β
t---the temperature compensation coefficient (%) of alloy material under the bulging temperature, different for the temperature compensation coefficient of material different under different temperatures, the present invention gets 1.2%～1.65%;
D---bulging becomes the springback capacity (mm) of special-shaped ring 20 back internal diameter sizes, and the present invention gets 2mm～4mm.
Above-mentioned size is as the criterion to be out of shape maximum size when calculating, and the size when calculating for the present invention is meant the size of the big end surface bottom face of straight-flanked ring rolled piece 10 or special-shaped ring base 15
Adopt the stainless steel abnormity ring of said method bulging, its internal diameter size scope is: Φ 400mm～Φ 4500mm, wall thickness are 10mm～200mm, highly are 40mm～750mm.
The present invention is not limited to above-mentioned special-shaped ring rolled piece 20; For the special-shaped ring rolled piece of different cross section as long as correspondingly be processed into the corresponding to shape of shape with the inner peripheral surface of special-shaped ring rolled piece to the outer circumference surface shape of bulging piece 3, but adopt method of the present invention just bulging go out the special-shaped ring rolled piece of different cross section.
Claims (5)
1. a stainless steel rectangular looping mill rolling spare heat expansion shape is configured as the method for special-shaped ring, it is characterized in that, may further comprise the steps:
Put into the bulging machine to the stainless steel rectangular looping mill rolling spare cover that is heated to 1090 ℃～1120 ℃; Its inner ring surface is enclosed within through being preheating to the outer circumference surface periphery of 275 ℃～325 ℃ bulging piece; The outer circumference surface of said bulging piece has and the inner peripheral surface of the special-shaped ring of the final expansion forming consistent shape that matches; At this moment, radial slider is in and 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 straight-flanked ring rolled piece from the inner circumferential surface of straight-flanked ring rolled piece; The size expansion of inside and outside footpath takes place in the straight-flanked ring rolled piece and the wall thickness reduction plastic deformation is the special-shaped ring base, accomplishes bulging for the first time; In this bulging process, the bulging temperature of said straight-flanked ring rolled piece is 1090 ℃～1120 ℃, and the bulging time is 28s～38s, and the dwell time is 16s～18s, and the bulging deflection is 11%～13%;
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 special-shaped ring base 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 special-shaped ring base along 45 ° of central axis rotations, accomplishes the rotation first time of special-shaped ring base;
By above-mentioned first time bulging operation to carrying out the bulging second time through the special-shaped ring base behind the bulging for the first time; In this bulging process; The bulging temperature of said special-shaped ring base is 1060 ℃～1090 ℃; The bulging time is 18s～28s, and the dwell time is 9s～12s, and the bulging deflection is 1.8%～2%;
By the operation of above-mentioned first time of rotation to carrying out rotation second time through the special-shaped ring base behind the bulging for the second time, this rotation, said special-shaped ring base 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 special-shaped ring base behind the bulging for the second time; In this bulging process; The bulging temperature of said special-shaped ring base is 1030 ℃～1060 ℃; The bulging time is 18s～28s, and the dwell time is 9s～12s, and the bulging deflection is 1.4%～1.6%;
By the operation of above-mentioned first time of rotation to rotating for the third time through the special-shaped ring base behind the bulging for the second time, this rotation, said special-shaped ring base rotates 45 ° in the same way again with direction of rotation for the first time;
By above-mentioned first time bulging operation to carrying out bulging the 4th time through the special-shaped ring base behind the bulging for the third time; In this bulging process; The bulging temperature of said special-shaped ring base is 1000 ℃～1030 ℃; The bulging time is 28s～38s, and the dwell time is 20s～22s, and the bulging deflection is 1.2%～1.4%;
After bulging finished, the mandrel slide block that moves up closed up radial slider, took out the special-shaped ring behind bulging.
2. straight-flanked ring rolled piece heat expansion shape according to claim 1 is configured as the method for special-shaped ring, and it is characterized in that: said stainless steel is 1Mn18Cr18N.
3. straight-flanked ring rolled piece heat expansion shape according to claim 1 and 2 is configured as the method for special-shaped ring, it 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 stainless steel material (MPa) under the bulging temperature, the 1Mn18Cr18N stainless steel is got 180MPa～220MPa;
Longitudinal section area (the mm of S---straight-flanked ring rolled piece or special-shaped ring base
2).
4. straight-flanked ring rolled piece heat expansion shape according to claim 1 and 2 is configured as the method for special-shaped ring, it is characterized in that: said special-shaped ring is calculated by following formula at the bulging size under hot and is confirmed:
D＝D
0(1+β
t)+d
In the formula:
D---special-shaped ring is in the internal diameter size (mm) under hot;
D
0---special-shaped ring is in the final products internal diameter size (mm) under the cold conditions;
β
t---the temperature compensation coefficient (%) of alloy material under the bulging temperature, the 1Mn18Cr18N stainless steel gets 1.2%～1.65%;
D---bulging becomes the springback capacity (mm) of internal diameter size after the special-shaped ring, and the 1Mn18Cr18N stainless steel is got 2mm～4mm.
5. straight-flanked ring rolled piece heat expansion shape according to claim 1 and 2 is configured as the method for special-shaped ring; It is characterized in that: the special-shaped ring of said expansion forming; Its internal diameter size scope is Φ 400mm～Φ 4500mm, and wall thickness is 10mm～200mm, highly is 40mm～750mm.
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|---|---|---|---|
| CN201110377927.3A CN102513457B (en) | 2011-11-24 | 2011-11-24 | Method for forming irregular ring piece by utilizing stainless-steel rectangular ring rolled piece through thermal bulging |
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|---|---|---|---|
| CN201110377927.3A CN102513457B (en) | 2011-11-24 | 2011-11-24 | Method for forming irregular ring piece by utilizing stainless-steel rectangular ring rolled piece through thermal bulging |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103433362A (en) * | 2013-09-01 | 2013-12-11 | 贵州航宇科技发展股份有限公司 | Method for forming deformed section annular part from stainless steel rectangular section annular part in a thermal expansion mode |
| CN103447378A (en) * | 2013-09-01 | 2013-12-18 | 贵州航宇科技发展股份有限公司 | Hot bulging forming method for bearing steel rectangular cross-section ring unit |
| CN103447377A (en) * | 2013-09-01 | 2013-12-18 | 贵州航宇科技发展股份有限公司 | Heat bulging forming method for stainless steel rectangular cross section annular elements |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002210529A (en) * | 2001-01-12 | 2002-07-30 | Mitsubishi Heavy Ind Ltd | Hot forming method for titanium alloy cylindrical parts |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103433362A (en) * | 2013-09-01 | 2013-12-11 | 贵州航宇科技发展股份有限公司 | Method for forming deformed section annular part from stainless steel rectangular section annular part in a thermal expansion mode |
| CN103447378A (en) * | 2013-09-01 | 2013-12-18 | 贵州航宇科技发展股份有限公司 | Hot bulging forming method for bearing steel rectangular cross-section ring unit |
| CN103447377A (en) * | 2013-09-01 | 2013-12-18 | 贵州航宇科技发展股份有限公司 | Heat bulging forming method for stainless steel rectangular cross section annular elements |
| CN103433362B (en) * | 2013-09-01 | 2015-08-05 | 贵州航宇科技发展股份有限公司 | Stainless steel rectangular cross sectional annular part heat expansion forms the method for odd-shaped cross section annular element |
| CN103447377B (en) * | 2013-09-01 | 2016-02-03 | 贵州航宇科技发展股份有限公司 | The Thermal expansion manufacturing process of stainless steel rectangular cross sectional annular part |
| CN103447378B (en) * | 2013-09-01 | 2016-02-24 | 贵州航宇科技发展股份有限公司 | The Thermal expansion manufacturing process of bearing steel square-section annular part |
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