CN111530939A - Method for controlling defect of steel rail rolling head - Google Patents
Method for controlling defect of steel rail rolling head Download PDFInfo
- Publication number
- CN111530939A CN111530939A CN202010393397.0A CN202010393397A CN111530939A CN 111530939 A CN111530939 A CN 111530939A CN 202010393397 A CN202010393397 A CN 202010393397A CN 111530939 A CN111530939 A CN 111530939A
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- Prior art keywords
- chamfer
- rail
- rolling
- defect
- head
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- 238000005096 rolling process Methods 0.000 title claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 33
- 239000010959 steel Substances 0.000 title claims abstract description 33
- 230000007547 defect Effects 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000009749 continuous casting Methods 0.000 claims abstract description 8
- 238000000926 separation method Methods 0.000 abstract description 6
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 208000032544 Cicatrix Diseases 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 231100000241 scar Toxicity 0.000 description 1
- 230000037387 scars Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B37/00—Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B15/00—Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B15/0007—Cutting or shearing the product
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a method for controlling the defect of a steel rail rolling head, relates to the field of steel rolling, and solves the technical problem of providing a method for controlling the defect of the steel rail rolling head. The technical scheme adopted by the invention is as follows: a method for controlling the defect of the steel rail rolling head splitting comprises the steps of chamfering the end face of a steel billet and then rolling; the chamfer comprises a chamfer between the end face and the side face corresponding to the rail head and a chamfer between the end face and the side face corresponding to the rail bottom. The deformation of the double-drum shape of the chamfer cogging box hole is the deformation of a single drum shape, the phenomena of separation of a rail head and a rail web and separation of a rail bottom and the rail web cannot occur, and the defect of head splitting is avoided. The chamfer of railhead department and the chamfer of rail bottom department are chamfer angle and axial symmetry, and the chamfer width an of two chamfers is 80 ~ 150mm, and chamfer height b is 30 ~ 80 mm. The invention is suitable for rolling the continuous casting billet.
Description
Technical Field
The invention relates to the field of steel rolling, in particular to a method for controlling the defect of a steel rail rolling head.
Background
Rail standards have a clear requirement on rolling reduction ratios, which must be greater than 9: 1. The larger the rolling reduction ratio is, the more beneficial the steel rail structure and performance is to be improved, but the larger the rolling reduction ratio is, the less likely the deformation is to penetrate into the center of the steel billet. The cutting surface of the existing billet is respectively vertical to the rail head and the rail bottom, the billet is in double-drum deformation shape in the rolling process, and the defects of split heads of the rail head and the rail web separation and the rail bottom and the rail web separation are finally formed, referring to fig. 3, referring to fig. 1 and fig. 2. The rolling deformation occurs on the surface, and after subsequent rolling, the central part can not be rolled, so as to cause the defects of rolling scars or rolling marks on the surface of the finished product steel rail, and a rack steel piling accident is formed in severe cases.
For the defect of the split head, no special solution exists at present, and the proper blank specification is mainly selected according to the single weight of the finished steel rail, for example, 380X 280mm continuous casting blanks are selected for producing 60kg/m steel rails.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for controlling the defect of the steel rail rolling head splitting.
The technical scheme adopted by the invention is as follows: a method for controlling the defect of the steel rail rolling head splitting comprises the steps of chamfering the end face of a steel billet and then rolling; the chamfer comprises a chamfer between the end face and the side face corresponding to the rail head and a chamfer between the end face and the side face corresponding to the rail bottom.
Further, the method comprises the following steps: the chamfer at the rail head and the chamfer at the rail bottom are both chamfer angles and are axisymmetric, and the symmetric axis is a billet center line.
Specifically, the method comprises the following steps: the chamfer width a of the two chamfers is 80-150 mm, and the chamfer height b is 30-80 mm.
Specifically, the method comprises the following steps: the corresponding relationship between the chamfer width a and the chamfer height b and the rolling reduction ratio k is as follows: the chamfer width a is 6.5k and the chamfer height b is 2.9 k.
Specifically, the method comprises the following steps: a320 x 410mm continuous casting billet is adopted to produce a 60kg/m steel rail, the chamfer width a is 110mm, and the chamfer height b is 50 mm.
The invention has the beneficial effects that: a billet cutting method for controlling the defect of the steel rail rolling head splitting comprises the steps of chamfering the end face of a billet and then rolling, so that the double-drum deformation of the shaped hole of a cogging box is changed into single-drum deformation, the phenomena of rail head and rail web separation and rail bottom and rail web separation are avoided, and the defect of the head splitting is avoided.
Drawings
FIG. 1 is a schematic cross-sectional view of a billet prior to rolling.
Fig. 2 is a schematic cross-sectional deformation of a billet after rolling.
FIG. 3 is a schematic diagram of a split head defect after billet rolling.
Fig. 4 is a schematic diagram of an embodiment of the present invention.
Fig. 5 is a schematic view of the structure of the rolled billet according to the embodiment of the present invention.
Reference numerals: end face 1, railhead 2, rail bottom 3.
Detailed Description
The invention will be further explained with reference to the drawings.
The invention discloses a method for controlling the defect of steel rail rolling head splitting, which adopts a 320 x 410mm continuous casting billet to produce a 60kg/m steel rail, and carries out chamfering treatment on the end surface of the continuous casting billet and then rolling. As shown in figure 3, the end surface 1 of the continuous casting blank is chamfered between the side surfaces corresponding to the end surface 1 and the rail head 2, and chamfered between the side surfaces corresponding to the end surface 1 and the rail bottom 3. The chamfers at the two positions of the rail head 2 and the rail bottom 3 are fillets or right angles, and are axisymmetric, and the symmetry axis is a center line of the steel billet. Specifically, as shown in fig. 3, the two chamfers are axisymmetric, the chamfer width a is 80-150 mm, and the chamfer height b is 30-80 mm. The values of the chamfer width a and the chamfer height b are determined according to the rolling compression ratio, and the larger the rolling compression ratio is, the larger the value is. In this embodiment, the chamfer width a is 110mm, the chamfer height b is 50mm, the center of the rail web at the end of the steel rail rolled by the billet is not cracked, and the rail web is longer than the rail head and the rail bottom, as shown in fig. 5.
Comparative example: the method is characterized in that a 320 x 410mm continuous casting billet is adopted to produce a 60kg/m steel rail, the cutting surface of a billet is respectively vertical to a rail head and a rail bottom, after the billet is rolled, the end part of the steel rail cracks along the central line of the rail web of the steel rail, and the maximum crack position is about 50mm, as shown in figure 3.
Claims (5)
1. The method for controlling the defect of the steel rail rolling head splitting is characterized in that: chamfering the end face (1) of the billet and then rolling; the chamfer comprises a chamfer between the side faces corresponding to the end face (1) and the rail head (2) and a chamfer between the side faces corresponding to the end face (1) and the rail bottom (3).
2. The method for controlling the defect of the steel rail rolling head splitting as claimed in claim 1, wherein: the chamfer angle at the rail head (2) and the chamfer angle at the rail bottom (3) are both chamfer angles and are axisymmetric, and the symmetric axis is a billet center line.
3. The method for controlling the defect of the steel rail rolling head splitting as claimed in claim 2, wherein: the chamfer width a of the two chamfers is 80-150 mm, and the chamfer height b is 30-80 mm.
4. The method for controlling the defect of the steel rail rolling head splitting as claimed in claim 3, wherein: the corresponding relationship between the chamfer width a and the chamfer height b and the rolling reduction ratio k is as follows: the chamfer width a is 6.5k and the chamfer height b is 2.9 k.
5. The method for controlling the defect of the steel rail rolling head splitting as claimed in claim 3, wherein: a320 x 410mm continuous casting billet is adopted to produce a 60kg/m steel rail, the chamfer width a is 110mm, and the chamfer height b is 50 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010393397.0A CN111530939B (en) | 2020-05-11 | 2020-05-11 | Method for controlling defect of steel rail rolling head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010393397.0A CN111530939B (en) | 2020-05-11 | 2020-05-11 | Method for controlling defect of steel rail rolling head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111530939A true CN111530939A (en) | 2020-08-14 |
| CN111530939B CN111530939B (en) | 2021-09-07 |
Family
ID=71967917
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010393397.0A Active CN111530939B (en) | 2020-05-11 | 2020-05-11 | Method for controlling defect of steel rail rolling head |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111530939B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5527420A (en) * | 1978-08-16 | 1980-02-27 | Hitachi Ltd | Treating method before cold rolling of thin plate |
| SU900886A1 (en) * | 1978-10-25 | 1982-01-30 | Донецкий научно-исследовательский институт черной металлургии | Method of rolling sheets mainly in reversive thick-sheet rolling mills |
| US4378687A (en) * | 1981-01-22 | 1983-04-05 | Shilov Vladislav A | Method for rolling H-sections in continuous mill |
| JPS5870901A (en) * | 1981-10-23 | 1983-04-27 | Nippon Steel Corp | Crop reduction rolling method in hot rolling |
| US20080263851A1 (en) * | 2004-12-27 | 2008-10-30 | Gyan Jha | Shaped direct chill aluminum ingot |
| US20150217348A1 (en) * | 2011-09-28 | 2015-08-06 | W. Silver Inc. | No-slit hot rolling of railroad rails |
-
2020
- 2020-05-11 CN CN202010393397.0A patent/CN111530939B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5527420A (en) * | 1978-08-16 | 1980-02-27 | Hitachi Ltd | Treating method before cold rolling of thin plate |
| SU900886A1 (en) * | 1978-10-25 | 1982-01-30 | Донецкий научно-исследовательский институт черной металлургии | Method of rolling sheets mainly in reversive thick-sheet rolling mills |
| US4378687A (en) * | 1981-01-22 | 1983-04-05 | Shilov Vladislav A | Method for rolling H-sections in continuous mill |
| JPS5870901A (en) * | 1981-10-23 | 1983-04-27 | Nippon Steel Corp | Crop reduction rolling method in hot rolling |
| US20080263851A1 (en) * | 2004-12-27 | 2008-10-30 | Gyan Jha | Shaped direct chill aluminum ingot |
| US20150217348A1 (en) * | 2011-09-28 | 2015-08-06 | W. Silver Inc. | No-slit hot rolling of railroad rails |
Non-Patent Citations (1)
| Title |
|---|
| 杨洋: "钢轨万能轧制过程变形机理及单位压力分布规律研究", 《中国优秀硕士学位论文全文数据库 工程科技I辑》 * |
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| Publication number | Publication date |
|---|---|
| CN111530939B (en) | 2021-09-07 |
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