CN102489597B - Hot bulging method for rectangular bearing steel rolled ring - Google Patents

Hot bulging method for rectangular bearing steel rolled ring Download PDF

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Publication number
CN102489597B
CN102489597B CN201110377758.3A CN201110377758A CN102489597B CN 102489597 B CN102489597 B CN 102489597B CN 201110377758 A CN201110377758 A CN 201110377758A CN 102489597 B CN102489597 B CN 102489597B
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bulging
mill rolling
looping mill
time
radial slider
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CN201110377758.3A
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Chinese (zh)
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CN102489597A (en
Inventor
苏春民
段忠园
杨国平
朱灵华
卢艳
肖成顺
李志鸿
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贵州安大航空锻造有限责任公司
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Abstract

The invention discloses a hot bulging method for a rectangular bearing steel rolled ring; the hot bulging method comprises the following steps of: sleeving a rectangular bearing steel hot-rolled ring at the periphery of a preheated bulging block in 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 temperature is 860 DEG C to 900 DEG C, the bulging time is 20s-30s, the pressure holding time is 12s-15s, and the deformation amount is 0.4%-0.7%; 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 temperature is 830 DEG C to 870 DEG C, the bulging time is 25s-35s, the pressure holding time is 18s-22s, and the deformation amount is 0.6%-1%; rotating the rolled ring again to complete secondary rotation according to the primary rotation direction; and carrying out third bulging according to the operation, wherein the bulging temperature is 800 DEG C to 840 DEG C, the bulging time is 25-40s, the pressure holding time is 16s-20s, and the deformation amount is 0.6%-1.1%. The dimensional accuracy of the bulged rolled ring can reach 0.1%-0.2% of the corresponding dimension; and the bulged rolled ring is mainly applied to the fields of aerospace and the like.

Description

The hot expanding method of bearing steel straight-flanked ring rolled piece
Technical field
The present invention relates to a kind of expanding method of ring, particularly related to the hot expanding method of bearing steel straight-flanked ring rolled piece.
Background technology
Bearing steel straight-flanked ring rolled piece (referring to that longitudinal section is the looping mill rolling part of square-section) adopts after looping mill rolling, and owing to being subject to the impact of rolling mill practice and equipment limitation, its dimensional accuracy is generally not high; The in the situation that only more satisfactory at ring shape of rolling piece and equipment performance being more excellent, its dimensional accuracy just can reach 3 ‰ of corresponding size~5 ‰ (3/1000ths to 5/1000ths), and the looping mill rolling part after rolling is because stress is larger, if control the even defect such as cracking of bad easy generation warpage, distortion in following process operation.
On February 18th, 2009, disclosed Chinese invention patent description CN101367104A disclosed a kind of shroud ring, this process is by peripheral hardware high-pressure pump and make the highly pressurised liquid of its generation by the passage in high pressure cylinder, then via the passage subtracting in power post in mould part, inject fixing upper prod cast and mobile lower prod cast and the enclosure space of retaining ring formation, make retaining ring that plastic deformation occur under the effect of fluid pressure and carry out bulging retaining ring, to reach strengthening retaining ring, improve the object of retaining ring forming accuracy, from this patent specification accompanying drawing, can find out that described retaining ring is rectangle ring.The method, for the also disclosure in detail of dimensional accuracy how to improve ring by bulging, just broadly draws the object that can reach raising retaining ring forming accuracy, and the method can not solve the low problem of looping mill rolling part dimensional accuracy existing in prior art.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of hot expanding method that adopts bulging piece to realize bearing steel straight-flanked ring rolled piece, the method is carried out bulging by continuous three small deformation amounts to described bearing steel straight-flanked ring rolled piece, has obtained the high bulging looping mill rolling part of dimensional accuracy.
For solving the problems of the technologies described above, the hot expanding method of bearing steel straight-flanked ring rolled piece of the present invention, its technical scheme comprises the following steps:
Shape expanding machine is provided, and this shape expanding machine is mainly comprised of mandrel slide block, radial slider, bulging piece, workbench and guide rail; Described mandrel slide block is conical and is sleeved in radial slider and coordinates with the taper inner peripheral surface of radial slider, and can in radial slider, move up and down vertically extruding radial slide block; Described radial slider is 12 secter pats that separate, and is arranged on the guide rail of shape expanding machine and can radially moves around along guide rail, is installed with respectively bulging piece on the outer circumference surface of each secter pat, forms a toroidal when each secter pat closes up together with bulging piece; When described mandrel slide block moves down vertically in described radial slider, can make each radial slider radially synchronizing moving diffusion make bulging piece reach the object of bulging ring, when described mandrel slide block moves up vertically in radial slider shape expanding machine can drive each radial slider radially synchronizing moving close up and make bulging piece depart from the ring after bulging; On the workbench of this shape expanding machine, can drive in addition ring deflector roll along central axis rotation on this workbench;
Hot rolling bearing steel straight-flanked ring rolled piece cover is put into shape expanding machine, its inner ring surface is enclosed within through being preheating to the outer circumference surface periphery of the bulging piece of 250 ℃~300 ℃, now, radial slider is in closing up state;
Starting shape expanding machine applies axial tension F to mandrel slide block and it is moved down vertically and make the radially synchronizing moving diffusion of each radial slider along the endoporus conical surface extruding radial slide block of described radial slider, be contained in bulging piece on radial slider outer circumference surface from the inner circumferential surface of looping mill rolling part extrusion ring rolled piece radially, the plastic deformation of the expansion of looping mill rolling part generation dimension of inner and outer diameters and wall thickness reduction, completes bulging for the first time; In this Bulging Process, the bulging temperature of described looping mill rolling part is 860 ℃~900 ℃, and the bulging time is 20s~30s, and the dwell time is 12s~15s, and bulging deflection is 0.4%~0.7%;
Shape expanding machine drives mandrel slide block to move up vertically in radial slider, and drive radial slider radially synchronizing moving close up and make bulging piece depart from the looping mill rolling part after bulging, deflector roll on the workbench of startup shape expanding machine makes it drive described looping mill rolling part along 45 ° of central axis rotations, completes the rotation for the first time of looping mill rolling part;
By the operation of above-mentioned bulging for the first time, the looping mill rolling part through after bulging is for the first time carried out to bulging for the second time, in this Bulging Process, the bulging temperature of described looping mill rolling part is 830 ℃~870 ℃, and the bulging time is 25s~35s, dwell time is 18s~22s, and bulging deflection is 0.6%~1%;
Operation by above-mentioned rotation is for the first time rotated for the second time to the looping mill rolling part through after bulging for the second time, this rotation, and described looping mill rolling part rotates 45 ° in the same way again with direction of rotation for the first time;
By the operation of above-mentioned bulging for the first time, the looping mill rolling part through after bulging is for the second time carried out to bulging for the third time, in this Bulging Process, the bulging temperature of described looping mill rolling part is 800 ℃~840 ℃, and the bulging time is 25s~40s, dwell time is 16s~20s, and bulging deflection is 0.6%~1.1%;
After bulging finishes, the mandrel slide block that moves up, closes up radial slider, takes out the looping mill rolling part after bulging.
The bearing steel that the above-mentioned bearing steel preferred material trade mark is GCr15.
The axial tension F that described shape expanding machine applies mandrel slide block is calculated as follows definite:
F=ξ×σ 0.2×S
In formula:
ξ---shape expanding machine bulge coefficient, the present invention gets 1.26~1.52;
σ 0.2---the yield strength (MPa) of bulging temperature lower bearing Steel material, GCr15 alloy is got 50MPa~70MPa;
Longitudinal section area (the mm of S---looping mill rolling part 2).
The bulging size of described looping mill rolling part under hot be calculative determination as follows:
D=D 0(1+β t)+d
In formula:
D---looping mill rolling part is the internal diameter size (mm) under hot after bulging;
D 0---looping mill rolling part is the final products internal diameter size (mm) under cold conditions after bulging;
β t---the temperature compensation coefficient (%) of looping mill rolling part at bulging temperature, GCr15 alloy gets 1.2%~1.45%;
D---the springback capacity (mm) of internal diameter size after looping mill rolling part bulging, GCr15 alloy is got 3mm~5mm.
Adopt the bearing steel straight-flanked ring rolled piece of hot expanding method bulging of the present invention, its internal diameter size scope is Φ 400mm~Φ 4500mm, and wall thickness is 10mm~200mm, is highly 40mm~750mm.
Compared with prior art, beneficial effect of the present invention is as follows:
The present invention carries out rigidity by the bulging piece on shape expanding machine and bearing steel straight-flanked ring rolled piece and contacts direct bulging, can obtain needed bulging size and be conducive to improve dimensional accuracy.
The present invention carries out bulging by three small deformation amounts, and by selecting the suitable technological parameters such as bulging temperature, bulging time and dwell time, thereby can guarantee that bearing steel straight-flanked ring rolled piece can not produce dynamic recrystallization in Bulging Process, can not exert an influence to the tissue of looping mill rolling part, there will not be spalling phenomenon, can also make after each bulging the springback capacity of looping mill rolling part less; And pass through 45 ° of twice rotating Vortexes of described looping mill rolling part in Bulging Process, the vestige that gap in the time of can eliminating bulging piece and radially spread bulging between adjacent bulging piece forms looping mill rolling part inner peripheral surface, thus be conducive to carrying out smoothly and obtaining the bulging looping mill rolling part that dimensional accuracy is higher of Bulging Process; In whole Bulging Process, because bulging piece can be measured the springback capacity of internal diameter size after the situation of change of looping mill rolling part internal diameter size and each bulging in real time, and measurement data is sent in time on the display of shape expanding machine, thereby when bulging the accurate bulging size of control loop rolled piece.In sum, adopt the looping mill rolling part of the method for the invention bulging can obtain the final products size that dimensional accuracy is higher.
In Bulging Process, axial tension F mandrel slide block being applied due to shape expanding machine is the yield strength (σ by material at the bulge coefficient (ξ) of shape expanding machine, bulging temperature 0.2) and the longitudinal section area (S) of looping mill rolling part determine, therefore, can determine the size of axial tension F for the looping mill rolling part of different shape expanding machines and different materials, size, make looping mill rolling part stressed more even more reasonable in Bulging Process, can guarantee carrying out smoothly of Bulging Process, avoid exerting oneself excessive cause spalling or exert oneself too smallly cause swollen motionless phenomenon to occur.
The hot bulging internal diameter size (D) of described bulging looping mill rolling part is by looping mill rolling part final products internal diameter size (D under cold conditions after bulging 0), the temperature compensation coefficient (β of looping mill rolling part at bulging temperature t) and looping mill rolling part bulging after the springback capacity (d) of internal diameter size carry out calculative determination, thereby the accurate thermal state sizes of control loop rolled piece when bulging, and be the final products size of looping mill rolling part after bulging in the high cold conditions size of the cooling rear acquisition dimensional accuracy of bulging looping mill rolling part.
The present invention just from looping mill the bearing steel straight-flanked ring rolled piece of roll forming carry out while hot bulging, not only its waste heat energy enough meets the needs of bulging temperature, and can avoid the phenomenon that stress further increases after the cooling contraction of looping mill rolling part, bulging is conducive to reduce the impact of stress on looping mill rolling part dimensional accuracy before looping mill rolling part stress increases while hot.Bulging can also reduce the operation reheating while hot, saves the energy and raises labour productivity.And, preheating bulging piece, in the time of can also avoiding described looping mill rolling part bulging, temperature reduces too fastly, affects bulging temperature parameter.
The bearing steel straight-flanked ring rolled piece that the trade mark of take is GCr15 is example, and the cold conditions size of this alloy straight-flanked ring rolled piece after bulging is final products sizes after testing, and the dimensional accuracy of its internal diameter, wall thickness and height has reached respectively 1 ‰ of corresponding size~2 ‰; , there is not any variation in the interior tissue of this looping mill rolling part after testing, and without defects such as distortion, warpages.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is that hot rolling straight-flanked ring rolled piece is along the profilograph of its center line.
Fig. 2 is the structure diagram of shape expanding machine.
Fig. 3 is the installation schematic diagram of hot rolling straight-flanked ring rolled piece.
Fig. 4 is the hot Bulging Process schematic diagram of hot rolling straight-flanked ring rolled piece.
Fig. 5 is the schematic diagram that bulging piece departs from the straight-flanked ring rolled piece after bulging.
The specific embodiment
The hot expanding method of implementing bearing steel straight-flanked ring rolled piece of the present invention need to provide the equipment such as shape expanding machine, manipulator.The bearing steel that China's material trademark of take is below GCr15 describes the specific embodiment of the method in detail as example:
The main chemical elements content (percentage by weight) of this alloy is: C content 0.95%~1.05%, containing Mn amount 0.2%~0.4%, si content 0.15%~0.35%, containing S amount≤0.020%, P content≤0.027%, containing Cr amount 1.30%~1.65%.
For implement hot expanding method of the present invention shape expanding machine structure diagram as shown in Figure 2, this shape expanding machine is mainly comprised 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 radial slider 2 and coordinates with the taper inner peripheral surface of radial slider 2, and mandrel slide block 1 can be driven and in radial slider 2, be moved up and down vertically and extruding radial slide block 2 by the hydraulic cylinder of shape expanding machine; Radial slider 2 is arranged on the guide rail 5 of shape expanding 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, on the outer circumference surface of each secter pat, be installed with respectively bulging piece 3, when each secter pat closes up, can form a toroidal together with bulging piece 3; When mandrel slide block 1 moves down vertically in radial slider 2, can make each radial slider 2 radially synchronizing moving diffusion make bulging piece 3 reach the object of bulging ring, when mandrel slide block 1 moves up vertically in radial slider 2 shape expanding machine can drive each radial slider 2 radially synchronizing moving close up and make bulging piece 3 depart from the ring after bulgings, bulging piece 3 has real-time measurement ring internal diameter size and measurement data is sent to the function on the display of shape expanding machine in Bulging Process; In addition, on the workbench 4 of this shape expanding machine, can drive in addition ring deflector roll (not shown) along central axis rotation on this workbench.
It is as follows that this alloy carries out the processing step of heat expansion shape from being rolled into straight-flanked ring rolled piece:
Step 1: installation.
As shown in Figure 3, first the bulging piece 3 on shape expanding machine is preheating to 250 ℃~300 ℃, again the GCr15 alloy straight-flanked ring rolled piece 10 as shown in Figure 1 of just roll forming from looping mill is overlapped while hot and puts into shape expanding 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, now, radial slider 2 is in closing up state.During installation, the shipment of workpiece mainly completes by Robot actions.
Step 2: bulging for the first time.
As shown in Figure 4, starting shape expanding machine makes its mandrel slide block 1 axially move down along it, mandrel slide block 1 makes the radially synchronizing moving diffusion of each radial slider 2 along its taper surface extruding radial slide block 2 radial slider 2 is interior, the outer circumference surface of the bulging piece 3 in radial slider 2 contacts with the inner circumferential surface of looping mill rolling part 10, and along the inner circumferential surface extrusion ring rolled piece 10 of looping mill rolling part 10, make looping mill rolling part 10 from inner circumferential surface to external peripheral surface, be subject to the radial compression power from bulging piece 3, cause the inner peripheral surface of looping mill rolling part 10 radially to expand, in looping mill rolling part 10 occurs, outside dimension expands, the plastic deformation of wall thickness reduction, looping mill rolling part 10 is by bulging piece 3 bulging for the first time, during bulging, the hydraulic cylinder of shape expanding machine applies axial tension F to mandrel slide block 1, the bulging temperature of looping mill rolling part 10 is 860 ℃~900 ℃, bulging time 20s~30s, dwell time is 12s~15s, the bulging deflection of looping mill rolling part 10 is 0.4%~0.7%.
The described bulging time is the time after looping mill rolling part 10 is finished to bulging by bulging from the beginning; The described dwell time refers to after looping mill rolling part 10 is reached deflection by bulging and no longer deforms and remain to the time that bulging finishes always.
Step 3: rotation for the first time.
As shown in Figure 5, make shape expanding machine drive mandrel slide block 1 to move up vertically in radial slider 2, and drive radial slider 2 radially synchronizing moving close up and make bulging piece 3 depart from the looping mill rolling part 10 after bulgings, start deflector roll on the workbench 4 of shape expanding machine make its driving ring rolled piece 10 on this workbench along central axis clockwise or be rotated counterclockwise 45 °, thereby complete the rotation for the first time of looping mill rolling part 10.
Step 4: bulging for the second time.
The Bulging Process of repeating step 1 makes 3 pairs of looping mill rolling parts of bulging piece 10 carry out bulging for the second time, during bulging, the hydraulic cylinder of shape expanding machine applies axial tension F to mandrel slide block 1, the bulging temperature of looping mill rolling part 10 is 830 ℃~870 ℃, the bulging time is 25s~35s, dwell time is 18s~22s, and the bulging deflection of looping mill rolling part 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 shape expanding machine and direction of rotation for the first time rotate in the same way 45 ° again, thereby completes the rotation for the second time of looping mill rolling part 10.
Step 6: bulging for the third time.
The Bulging Process of repeating step 1 makes 3 pairs of looping mill rolling parts of bulging piece 10 carry out bulging for the third time, during bulging, the hydraulic cylinder of shape expanding machine applies axial tension F to mandrel slide block 1, the bulging temperature of looping mill rolling part 10 is 800 ℃~840 ℃, the bulging time is 25s~40s, dwell time is 16s~20s, and the bulging deflection of looping mill rolling part 10 is 0.6%~1.1%.
After three times bulging finishes, the mandrel slide block 1 that moves up, closes up radial slider 2 and makes bulging piece 3 depart from looping mill rolling part 10, thereby take out looping mill rolling part 10 with manipulator, completes Bulging Process.
Looping mill rolling part 10 is in Bulging Process, and described axial tension F is calculated as follows:
F=ξ×σ 0.2×S
In formula:
ξ---shape expanding machine bulge coefficient, the present invention gets 1.26~1.52;
σ 0.2---the yield strength (MPa) of bulging temperature lower bearing Steel material, the present invention gets 50MPa~70MPa;
Longitudinal section area (the mm of S---looping mill rolling part 10 2);
The computational methods of the bulging deflection of described looping mill rolling part 10 are: bulging deflection=[the central diameter size of looping mill rolling part 10 before (the central diameter size of the front looping mill rolling part 10 of the central diameter size-bulging of looping mill rolling part 10 after bulging)/bulging] * 100%.
The central diameter size of described looping mill rolling part 10=(outside dimension of internal diameter size+looping mill rolling part 10 of looping mill rolling part 10) ÷ 2
For guaranteeing that described looping mill rolling part 10 can access the final size of product requirement after bulging, looping mill rolling part 10 calculates as follows at the bulging size under hot:
D=D 0(1+β t)+d
In formula:
D---looping mill rolling part 10 is the internal diameter size (mm) under hot after bulging;
D 0---looping mill rolling part 10 is the final products internal diameter size (mm) under cold conditions after bulging;
β t---the temperature compensation coefficient (%) of looping mill rolling part 10 at bulging temperature, the temperature compensation coefficient for different materials under different temperatures is different, and the present invention gets 1.2%~1.45%;
D---the springback capacity (mm) of internal diameter size after looping mill rolling part 10 bulgings, the present invention gets 3mm~5mm.
The bearing steel straight-flanked ring rolled piece that adopts said method bulging, its internal diameter size scope is: Φ 400mm~Φ 4500mm, wall thickness is 10mm~200mm, is highly 40mm~750mm.

Claims (5)

1. a hot expanding method for bearing steel straight-flanked ring rolled piece, is characterized in that, comprises the following steps:
Shape expanding machine is provided, and this shape expanding machine is mainly comprised of mandrel slide block, radial slider, bulging piece, workbench and guide rail; Described mandrel slide block is conical and is sleeved in radial slider and coordinates with the taper inner peripheral surface of radial slider, and can in radial slider, move up and down vertically extruding radial slide block; Described radial slider is 12 secter pats that separate, and is arranged on the guide rail of shape expanding machine and can radially moves around along guide rail, is installed with respectively bulging piece on the outer circumference surface of each secter pat, forms a toroidal when each secter pat closes up together with bulging piece; When described mandrel slide block moves down vertically in described radial slider, can make each radial slider radially synchronizing moving diffusion make bulging piece reach the object of bulging ring, when described mandrel slide block moves up vertically in radial slider shape expanding machine can drive each radial slider radially synchronizing moving close up and make bulging piece depart from the ring after bulging; On the workbench of this shape expanding machine, can drive in addition ring deflector roll along central axis rotation on this workbench;
Hot rolling bearing steel straight-flanked ring rolled piece cover is put into shape expanding machine, its inner ring surface is enclosed within through being preheating to the outer circumference surface periphery of the bulging piece of 250 ℃~300 ℃, now, radial slider is in closing up state;
Starting shape expanding machine applies axial tension F to mandrel slide block and it is moved down vertically and make the radially synchronizing moving diffusion of each radial slider along the endoporus conical surface extruding radial slide block of described radial slider, the bulging piece being contained on radial slider outer circumference surface radially pushes this looping mill rolling part from the inner circumferential surface of looping mill rolling part, looping mill rolling part generation dimension of inner and outer diameters expands and wall thickness reduction plastic deformation, completes bulging for the first time; In this Bulging Process, the bulging temperature of described looping mill rolling part is 860 ℃~900 ℃, and the bulging time is 20s~30s, and the dwell time is 12s~15s, and bulging deflection is 0.4%~0.7%;
Shape expanding machine drives mandrel slide block to move up vertically in radial slider, and drive radial slider radially synchronizing moving close up and make bulging piece depart from the looping mill rolling part after bulging, deflector roll on the workbench of startup shape expanding machine makes it drive described looping mill rolling part along 45 ° of central axis rotations, completes the rotation for the first time of looping mill rolling part;
By the operation of above-mentioned bulging for the first time, the looping mill rolling part through after bulging is for the first time carried out to bulging for the second time, in this Bulging Process, the bulging temperature of described looping mill rolling part is 830 ℃~870 ℃, and the bulging time is 25s~35s, dwell time is 18s~22s, and bulging deflection is 0.6%~1%;
Operation by above-mentioned rotation is for the first time rotated for the second time to the looping mill rolling part through after bulging for the second time, this rotation, and described looping mill rolling part rotates 45 ° in the same way again with direction of rotation for the first time;
By the operation of above-mentioned bulging for the first time, the looping mill rolling part through after bulging is for the second time carried out to bulging for the third time, in this Bulging Process, the bulging temperature of described looping mill rolling part is 800 ℃~840 ℃, and the bulging time is 25s~40s, dwell time is 16s~20s, and bulging deflection is 0.6%~1.1%;
After bulging finishes, the mandrel slide block that moves up, closes up radial slider, takes out the looping mill rolling part after bulging.
2. the hot expanding method of straight-flanked ring rolled piece according to claim 1, is characterized in that: described bearing steel is GCr15.
3. the hot expanding method of straight-flanked ring rolled piece according to claim 1 and 2, is characterized in that: the axial tension F that described shape expanding machine applies mandrel slide block is calculated as follows definite:
F=ξ×σ 0.2×S
In formula:
ξ---shape expanding machine bulge coefficient, the present invention gets 1.26~1.52;
σ 0.2---the yield strength (MPa) of bulging temperature lower bearing Steel material, GCr15 alloy is got 50MPa~70MPa;
Longitudinal section area (the mm of S---looping mill rolling part 2).
4. the hot expanding method of straight-flanked ring rolled piece according to claim 1 and 2, is characterized in that: the bulging size of described looping mill rolling part under hot be calculative determination as follows:
D=D 0(1+β t)+d
In formula:
D---looping mill rolling part is the internal diameter size (mm) under hot after bulging;
D 0---looping mill rolling part is the final products internal diameter size (mm) under cold conditions after bulging;
β t---the temperature compensation coefficient (%) of looping mill rolling part at bulging temperature, GCr15 alloy gets 1.2%~1.45%;
D---the springback capacity (mm) of internal diameter size after looping mill rolling part bulging, GCr15 alloy is got 3mm~5mm.
5. the hot expanding method of straight-flanked ring rolled piece according to claim 1 and 2, is characterized in that: the straight-flanked ring rolled piece of described bulging, and its internal diameter size scope is Φ 400mm~Φ 4500mm, wall thickness is 10mm~200mm, is highly 40mm~750mm.
CN201110377758.3A 2011-11-24 2011-11-24 Hot bulging method for rectangular bearing steel rolled ring CN102489597B (en)

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