CN105396997A - Isotropic rolling method for bearing steel rectangular ring - Google Patents
Isotropic rolling method for bearing steel rectangular ring Download PDFInfo
- Publication number
- CN105396997A CN105396997A CN201510866806.3A CN201510866806A CN105396997A CN 105396997 A CN105396997 A CN 105396997A CN 201510866806 A CN201510866806 A CN 201510866806A CN 105396997 A CN105396997 A CN 105396997A
- Authority
- CN
- China
- Prior art keywords
- straight
- ring base
- bearing steel
- feed
- flanked ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/06—Making articles shaped as bodies of revolution rings of restricted axial length
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
- B21H1/00—Making articles shaped as bodies of revolution
- B21H1/22—Making articles shaped as bodies of revolution characterised by use of rolls having circumferentially varying profile ; Die-rolling
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
Abstract
The invention discloses an isotropic rolling method for a bearing steel rectangular ring. The isotropic rolling method comprises the following steps: firstly, heating a bearing steel bar till a forging temperature, and carrying out upsetting, piercing and pre-rolling to form a rectangular ring blank; secondly, loading the rectangular ring blank on a ring rolling mill, lifting a conical roller by h=5mm-10mm to tilt the rectangular ring blank, and then carrying out rolling forming to obtain the bearing steel rectangular ring. Such a method is capable of keeping the mechanical properties of the rectangular ring consistent in all directions by changing a flowing direction of the material during rolling, thereby improving the comprehensive mechanical properties of the rectangular ring. The method is used for producing the isotropic bearing steel rectangular rings.
Description
Technical field
The present invention relates to a kind of milling method of bearing steel rectangle ring, particularly relate to the isotropic milling method of a kind of bearing steel rectangle ring.
Background technology
Annular element rolling is one of the most effective means of current production performance seamless ring, obtains extensive use at numerous areas such as Aeronautics and Astronautics.Production for rectangle ring is carried out mainly with radial rolling mode, ring and blank adopt contour design, cone roller only plays the effect preventing ring from riseing and limit the increase of ring height, and axial deflection is less, causes the radial mechanical performance of ring to differ larger with axial mechanical property.Along with the development and progress of looping mill rolling technology, people have grasped the two-way roll forming mode of footpath/axle gradually, the rectangle ring which is produced, and its axial mechanical property obtains improvement to a great extent, but, still can not ensure that ring reaches consistent in the mechanical property of all directions.Its reason is, radial feed and axial feed all can make metal material flow to the tangential direction of ring, define forging flow lines in tangential direction, thus makes the mechanical property of tangential direction will be better than far away radial and axial mechanical property.
Summary of the invention
The technical problem to be solved in the present invention is to provide the isotropic milling method of a kind of bearing steel rectangle ring, by the flow direction of material during change rolling, each mechanical property of rectangle ring is consistent, thus improves the comprehensive mechanical property of rectangle ring.
For solving the problems of the technologies described above, the isotropic milling method of bearing steel rectangle ring of the present invention, its technical scheme comprises the following steps:
Bearing steel bar by specification blanking is heated to forging temperature, and after jumping-up, punching, rolling in advance, making is highly H
1, thickness is B
1, external diameter is R
1straight-flanked ring base;
Loaded on looping mill by described straight-flanked ring base, core roller passes from the centre of straight-flanked ring base, drives core roller and drives straight-flanked ring base close to home roll, then drives cone roller near the another side of straight-flanked ring base, bores roller up and down and is clipped in the middle by straight-flanked ring base; After straight-flanked ring base is set level, drive cone roller lifting h=5mm ~ 10mm, make the run-off the straight of straight-flanked ring base; Start looping mill to be rolled, the rotating speed r=1.0rad/s of adjustment home roll, with driving force F
1=226KN ~ 245KN makes core roller with v
1the feed speed of=2.5mm/s towards radial feed, the total amount S of radial feed
1=B
1-B
2+ (H
1× h)/2R
1, with driving force F
2=188KN ~ 208KN makes cone roller with v
2the feed speed of=1.5mm/s size towards axial feed, the total amount S of axial feed
2=H
1-H
2+ (B
1× h)/2R
1, in formula, B
1for thickness, the B of straight-flanked ring base
2for thickness, the H of rectangle ring
1for height, the H of straight-flanked ring base
2the height of rectangle ring, R
1the external diameter of straight-flanked ring base; After the operation of rolling enters stable state, cone roller is progressively put down, and maintain an equal level with workbench; Feed-disabling after radial feeds and axial feeding all reach target, rectangle ring is rotated under the effect of looping mill, stops after a period of time, rectangle ring is taken out.
The relation of described radial feed speed and axial feed velocity is as follows:
S
1/v
1＝S
2/v
2
In formula, S
1for the total amount of radial feed;
S
2for the total amount of axial feed;
V
1for radial feed speed;
V
2for radial feed speed.
The driving force F of described radial feed
1meet following relation:
F
1＝α×n
0×σ×H×L
1
In formula, F
1for the driving force of radial feed;
α is the pressure increase coefficient that rectangle ring broadening causes, and gets 0.8 ~ 1.2;
N
0for real-time stress status modulus;
σ is the flow stress of material;
H is the real-time height of straight-flanked ring base;
L
1for the real-time arc length that core roller contacts with straight-flanked ring base.
The driving force F of described axial feed
2meet following relation:
F
2＝β×n
0×σ×B×L
2
In formula, F
2for the driving force of axial feed;
β is the pressure increase coefficient that rectangle ring height reduces to cause, and gets 1.2 ~ 1.5;
N
0for real-time stress status modulus;
σ is the flow stress of material;
B is the real-time thickness of straight-flanked ring base;
L
2for the real-time arc length that cone roller contacts with straight-flanked ring base.
Described bearing steel is G20Cr2Ni4 steel.
Compared with prior art, beneficial effect of the present invention is as follows:
The isotropic milling method of bearing steel rectangle ring of the present invention, by boring roller lifting h=5mm ~ 10mm, will make rectangle ring that inclination in a small amount occur, and will change the flowing of metal material during rolling, make it be consistent in all directions.
The rotating speed of home roll is set to 1.0rad/s, and radial feed speed is 2.5mm/s, and axial feed velocity is 1.5mm/s, and radial feed speed and axial feed velocity meet relational expression S
1/ v
1=S
2/ v
2, be to ensure that the material flow rate of tangential direction is consistent with radial, axial material flow rate.
The total amount of radial feed is S
1=B
1-B
2+ (H
1× h)/2R
1and the total amount S of axial feed
2=H
1-H
2+ (B
1× h)/2R
1, make straight-flanked ring base that sufficient plastic deformation occur on the one hand, improve mechanical property; The size difference caused in order to supplementary cone roller raises on the other hand.
The driving force F of radial feed
1meet relational expression F
1=α × n
0× σ × H × L
1, to the driving force F of feeding
2meet relational expression F
2=β × n
0× σ × B × L
2, make straight-flanked ring base, radial, axial, plastic deformation occur, prevent the vibration up and down produced because ring base tilts simultaneously.
Adopt bearing steel rectangle ring prepared by said method, its even tissue, better performances, each mechanical property is consistent substantially, is that the bearing steel rectangle ring of G20Cr2Ni4 is example with the trade mark:
The radial room temperature tensile properties of this bearing steel rectangle ring after testing, its tensile strength is 1122MPa (being greater than the 1058.4MPa of design instructions for use), and elongation after fracture was 6% (being greater than 5% of design instructions for use).
The axial room temperature tensile properties of this bearing steel rectangle ring after testing, its tensile strength is 1105MPa (being greater than the 1058.4MPa of design instructions for use), and elongation after fracture was 6% (being greater than 5% of design instructions for use).
The tangential room temperature tensile properties of this bearing steel rectangle ring after testing, its tensile strength is 1134MPa (being greater than the 1058.4MPa of design instructions for use), and elongation after fracture was 7% (being greater than 5% of design instructions for use).
Above-mentioned Physico-chemical tests result shows, roll-forming method after improvement produces bearing steel rectangle ring, and its each mechanical property is substantially identical and all meet the requirements.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is bearing steel rectangle ring isotropism milling method schematic diagram of the present invention.
Detailed description of the invention
Implement the isotropic milling method of bearing steel rectangle ring of the present invention to need to provide the equipment such as forge furnace, forcing press, manipulator, looping mill.The bearing steel being G20Cr2Ni4 for China's material trademark below describes the detailed description of the invention of the method in detail:
The main chemical elements content (percentage by weight) of this alloy is: C content 0.17% ~ 0.23%, containing Mn amount 0.30% ~ 0.60%, si content 0.15% ~ 0.40%, containing S amount≤0.030%, P content≤0.030%, containing Cr amount 1.25% ~ 1.75%, ni content 3.25% ~ 3.75%, containing Cu amount≤0.25, surplus is Fe.
The step of this method is as follows:
Bearing steel bar by specification blanking is heated to forging temperature, and after jumping-up, punching, rolling in advance, making is highly H
1, thickness is B
1, external diameter is R
1straight-flanked ring base;
As shown in Figure 1, load on looping mill by described straight-flanked ring base 1, core roller 3 passes from the centre of straight-flanked ring base 1, drives core roller 3 and drives straight-flanked ring base 1 close to home roll 2, drive cone roller 4 near the another side of straight-flanked ring base 1 again, bore roller 4 up and down and straight-flanked ring base 1 is clipped in the middle; After straight-flanked ring base 1 is set level, drive cone roller 4 lifting h=5mm ~ 10mm, make straight-flanked ring base 1 run-off the straight; Start looping mill to be rolled, the rotating speed r=1.0rad/s of adjustment home roll 2, with driving force F
1=226KN ~ 245KN makes core roller 3 with v
1the feed speed of=2.5mm/s towards radial feed, the total amount S of radial feed
1=B
1-B
2+ (H
1× h)/2R
1, with driving force F
2=188KN ~ 208KN makes cone roller 4 with v
2the feed speed of=1.5mm/s size towards axial feed, the total amount S of axial feed
2=H
1-H
2+ (B
1× h)/2R
1, in formula, B
1for thickness, the B of straight-flanked ring base
2for thickness, the H of rectangle ring
1for height, the H of straight-flanked ring base
2the height of rectangle ring, R
1the external diameter of straight-flanked ring base; After the operation of rolling enters stable state, cone roller 4 is progressively put down, and maintain an equal level with workbench 5; Feed-disabling after radial feeds and axial feeding all reach target, rectangle ring is rotated under the effect of looping mill, stops after a period of time, rectangle ring is taken out.
The relation of described radial feed speed and axial feed velocity is as follows:
S
1/v
1＝S
2/v
2
In formula, S
1for the total amount of radial feed;
S
2for the total amount of axial feed;
V
1for radial feed speed;
V
2for radial feed speed.
The driving force F of described radial feed
1meet following relation:
F
1＝α×n
0×σ×H×L
1
In formula, F
1for the driving force of radial feed;
α is the pressure increase coefficient that rectangle ring broadening causes, and gets 0.8 ~ 1.2;
N
0for real-time stress status modulus;
σ is the flow stress of material;
H is the real-time height of straight-flanked ring base;
L
1for the real-time arc length that core roller contacts with straight-flanked ring base.
The driving force F of described axial feed
2meet following relation:
F
2＝β×n
0×σ×B×L
2
In formula, F
2for the driving force of axial feed;
β is the pressure increase coefficient that rectangle ring height reduces to cause, and gets 1.2 ~ 1.5;
N
0for real-time stress status modulus;
σ is the flow stress of material;
B is the real-time thickness of straight-flanked ring base;
L
2for the real-time arc length that cone roller contacts with straight-flanked ring base.
Claims (5)
1. the isotropic milling method of bearing steel rectangle ring, is characterized in that, comprise the following steps:
Bearing steel bar by specification blanking is heated to forging temperature, and after jumping-up, punching, rolling in advance, making is highly H
1, thickness is B
1, external diameter is R
1straight-flanked ring base;
Loaded on looping mill by described straight-flanked ring base, core roller passes from the centre of straight-flanked ring base, drives core roller and drives straight-flanked ring base close to home roll, then drives cone roller near the another side of straight-flanked ring base, bores roller up and down and is clipped in the middle by straight-flanked ring base; After straight-flanked ring base is set level, drive cone roller lifting h=5mm ~ 10mm, make the run-off the straight of straight-flanked ring base; Start looping mill to be rolled, the rotating speed r=1.0rad/s of adjustment home roll, with driving force F
1=226KN ~ 245KN makes core roller with v
1the feed speed of=2.5mm/s towards radial feed, the total amount S of radial feed
1=B
1-B
2+ (H
1× h)/2R
1, with driving force F
2=188KN ~ 208KN makes cone roller with v
2the feed speed of=1.5mm/s size towards axial feed, the total amount S of axial feed
2=H
1-H
2+ (B
1× h)/2R
1, in formula, B
1for thickness, the B of straight-flanked ring base
2for thickness, the H of rectangle ring
1for height, the H of straight-flanked ring base
2the height of rectangle ring, R
1the external diameter of straight-flanked ring base; After the operation of rolling enters stable state, cone roller is progressively put down, and maintain an equal level with workbench; Feed-disabling after radial feeds and axial feeding all reach target, rectangle ring is rotated under the effect of looping mill, stops after a period of time, rectangle ring is taken out.
2. the isotropic milling method of bearing steel rectangle ring according to claim 1, is characterized in that, described bearing steel is G20Cr2Ni4 steel.
3. the isotropic milling method of bearing steel rectangle ring according to claim 1 and 2, is characterized in that, the relation of described radial feed speed and axial feed velocity is as follows:
S
1/v
1＝S
2/v
2
In formula, S
1for the total amount of radial feed;
S
2for the total amount of axial feed;
V
1for radial feed speed;
V
2for radial feed speed.
4. the isotropic milling method of bearing steel rectangle ring according to claim 1 and 2, is characterized in that, the driving force F of described radial feed
1meet following relation:
F
1＝α×n
0×σ×H×L
1
In formula, F
1for the driving force of radial feed;
α is the pressure increase coefficient that rectangle ring broadening causes, and gets 0.8 ~ 1.2;
N
0for real-time stress status modulus;
σ is the flow stress of material;
H is the real-time height of straight-flanked ring base;
L
1for the real-time arc length that core roller contacts with straight-flanked ring base.
5. the isotropic milling method of bearing steel rectangle ring according to claim 1 and 2, is characterized in that, the driving force F of described axial feed
2meet following relation:
F
2＝β×n
0×σ×B×L
2
In formula, F
2for the driving force of axial feed;
β is the pressure increase coefficient that rectangle ring height reduces to cause, and gets 1.2 ~ 1.5;
N
0for real-time stress status modulus;
σ is the flow stress of material;
B is the real-time thickness of straight-flanked ring base;
L
2for the real-time arc length that cone roller contacts with straight-flanked ring base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510866806.3A CN105396997A (en) | 2015-12-02 | 2015-12-02 | Isotropic rolling method for bearing steel rectangular ring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510866806.3A CN105396997A (en) | 2015-12-02 | 2015-12-02 | Isotropic rolling method for bearing steel rectangular ring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105396997A true CN105396997A (en) | 2016-03-16 |
Family
ID=55462936
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510866806.3A Pending CN105396997A (en) | 2015-12-02 | 2015-12-02 | Isotropic rolling method for bearing steel rectangular ring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105396997A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1697955A1 (en) * | 1989-04-11 | 1991-12-15 | Нижнеднепровский трубопрокатный завод им.К.Либкнехта | Method of producing rings with inner ridge |
| CN1978125A (en) * | 2006-12-06 | 2007-06-13 | 贵州安大航空锻造有限责任公司 | Rolling forming method of large and medium solid disc-shaped forge piece |
| CN101279343A (en) * | 2008-04-23 | 2008-10-08 | 贵州安大航空锻造有限责任公司 | Rolling forming method of stainless steel special-shaped ring forging |
| CN102489598A (en) * | 2011-11-24 | 2012-06-13 | 贵州安大航空锻造有限责任公司 | Thermal bulging process for special-shaped bearing steel rolled ring workpieces |
| CN103447767A (en) * | 2013-08-27 | 2013-12-18 | 贵州安大航空锻造有限责任公司 | Preparing method of G10CrNi3Mo bearing steel large-scale special-shaped cross section annular blank |
| CN103658168A (en) * | 2013-12-16 | 2014-03-26 | 贵州安大航空锻造有限责任公司 | Method for rolling rectangular die block steel ring blank into abnormal-shaped thin-wall ring member |
-
2015
- 2015-12-02 CN CN201510866806.3A patent/CN105396997A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1697955A1 (en) * | 1989-04-11 | 1991-12-15 | Нижнеднепровский трубопрокатный завод им.К.Либкнехта | Method of producing rings with inner ridge |
| CN1978125A (en) * | 2006-12-06 | 2007-06-13 | 贵州安大航空锻造有限责任公司 | Rolling forming method of large and medium solid disc-shaped forge piece |
| CN101279343A (en) * | 2008-04-23 | 2008-10-08 | 贵州安大航空锻造有限责任公司 | Rolling forming method of stainless steel special-shaped ring forging |
| CN102489598A (en) * | 2011-11-24 | 2012-06-13 | 贵州安大航空锻造有限责任公司 | Thermal bulging process for special-shaped bearing steel rolled ring workpieces |
| CN103447767A (en) * | 2013-08-27 | 2013-12-18 | 贵州安大航空锻造有限责任公司 | Preparing method of G10CrNi3Mo bearing steel large-scale special-shaped cross section annular blank |
| CN103658168A (en) * | 2013-12-16 | 2014-03-26 | 贵州安大航空锻造有限责任公司 | Method for rolling rectangular die block steel ring blank into abnormal-shaped thin-wall ring member |
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Application publication date: 20160316 |
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