CN113020532A - Steel rail utilization rate improving method based on heel end precision forging line - Google Patents
Steel rail utilization rate improving method based on heel end precision forging line Download PDFInfo
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- CN113020532A CN113020532A CN202110217827.8A CN202110217827A CN113020532A CN 113020532 A CN113020532 A CN 113020532A CN 202110217827 A CN202110217827 A CN 202110217827A CN 113020532 A CN113020532 A CN 113020532A
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 28
- 239000010959 steel Substances 0.000 title claims abstract description 28
- 238000005242 forging Methods 0.000 title claims abstract description 24
- 238000010438 heat treatment Methods 0.000 claims abstract description 33
- 230000007246 mechanism Effects 0.000 claims abstract description 33
- 239000002994 raw material Substances 0.000 claims abstract description 22
- 238000010079 rubber tapping Methods 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 5
- 238000004904 shortening Methods 0.000 claims description 3
- 238000012840 feeding operation Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 230000001737 promoting effect Effects 0.000 description 5
- 239000002184 metal Substances 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J17/00—Forge furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/0024—Charging; Discharging; Manipulation of charge of metallic workpieces
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Tunnel Furnaces (AREA)
Abstract
The method for improving the utilization rate of the steel rail based on the heel end finish forging line comprises the following steps: method 1, adjusting the position of 0 point of a stokehold feeding mechanism towards the direction of a forming section, and moving Lmm the position of 0 point of the stokehold feeding mechanism from the farthest stroke to the forming section; the heating length is shortened from the original Lmm; method 2, adjusting the furnace body Lmm of the intermediate frequency heating furnace towards the direction of the raw material; the infrared 0-position positioning point and the furnace body synchronously move towards the raw material direction Lmm. On the basis of not changing the overall scheme of stokehole feeding operation, the shortest feeding length of a feeding system is greatly increased from 6450 to 5190 according to the length of a rail forging product, the industrial bottleneck is broken through, and the utilization rate of the steel rail is improved.
Description
Technical Field
The invention belongs to the technical field and particularly relates to a method for improving the utilization rate of a steel rail based on a heel end finish forging line.
Background
The steel rail heel profiling automatic feeding system is applied to the railway switch industry till now, and plays a positive promoting role in improving the heel profiling production efficiency and improving the heel forging and pressing integral technological equipment level. However, compared with the traditional manual feeding operation, the automatic feeding system also has certain disadvantages, wherein the most obvious defects comprise two points, and one point is that the forging static positioning of the rail piece cannot be controlled; and the other point is that the profiling operation of the shortest blanking length of the original rail piece cannot be realized.
At present, the shortest blanking length of a feeding system commonly used in the industry is 6450, and in an extreme case, the shortest feeding length of 6050 can be met. And under the manual feeding operation mode, the shortest blanking length of the forging and pressing of the end following rail piece can be 5280. The shortest blanking length of the rail piece is artificially prolonged by 770mm by the automatic feeding system, and the material utilization rate of a single rail piece is reduced by 3% at least according to 25 m of raw materials. However, rail members of less than 6 meters have long been disposed of as waste. In the turnout heel products, the annual output of products with lengths of 5280, 5320, 4990 and the like which are less than 6 meters accounts for about 5-10% of the existing output, so that the annual loss of enterprises caused by the adverse factor of a feeding system is not small. In view of this, the following improvement is proposed.
Disclosure of Invention
The technical problems solved by the invention are as follows: the method for improving the steel rail utilization rate based on the heel end precision forging line has the advantages that on the basis that the overall scheme of stokehole feeding operation is not changed, the shortest feeding length of a feeding system is greatly improved from 6450 to 5190 according to the length of a forged and pressed product of a rail piece, the industry bottleneck is broken through, and the steel rail utilization rate is improved.
The technical scheme adopted by the invention is as follows: a steel rail utilization rate improving method based on a heel end finish forging line is characterized by comprising the following steps:
method 1, adjusting the position of 0 point of a stokehold feeding mechanism towards the direction of a forming section, and moving Lmm the position of 0 point of the stokehold feeding mechanism from the farthest stroke to the forming section; the heating length is shortened from the original Lmm;
method 2, adjusting the furnace body Lmm of the intermediate frequency heating furnace towards the direction of the raw material; the infrared 0-position positioning point and the furnace body synchronously move towards the raw material direction Lmm.
In the above technical solution, further: the Lmm is 230 mm.
In the above technical solution, further: the method 1 comprises
Adjusting the 0 point position of the stokehole feeding mechanism towards the forming section direction, and moving Lmm the 0 point position of the stokehole feeding mechanism from the farthest stroke to the forming section;
adjusting and shortening the feeding stroke length Lmm before the fire enters the furnace;
adjusting the length of a feeding stroke of a first fire before discharging to 1300 mm;
adjusting the length of a feeding stroke of the second fire before entering the furnace to be 1300;
the length of the feeding stroke of the second fire before entering the furnace is adjusted to 1300.
In the above technical solution, further: the method 1 comprises
Moving the position point 0 of the stokehold feeding mechanism to the forming section from the farthest stroke by a length Lmm;
the feeding length is reduced Lmm, and the heating length of the rail member entering the hearth is unchanged;
the stokehole feeding stroke is increased Lmm to reach the foremost end of the feeding stroke of the feeding mechanism;
the feeding mechanism drags the tapping position of the steel rail during tapping to move back Lmm towards the direction of the raw material;
the shortest length of the original rail piece is shortened Lmm;
when the second fire enters the furnace, the feeding stroke in front of the furnace is increased by Lmm;
the heating length of the second fire is different from that of the first fire, and the heating length of the second fire can only be shortened but can not be lengthened.
Compared with the prior art, the invention has the advantages that:
1. on the basis of not changing the overall scheme of stokehole feeding operation, the shortest feeding length of a feeding system is greatly increased from 6450 to 5190 according to the length of a rail forging product, the application bottleneck of an automatic production line of a rail heel end in the industry is broken through, and the utilization rate of the rail is improved.
2. In daily use, the shortest feeding length of the feeding equipment is improved to 5190, so that the unbalance loading degree of a feeding system is greatly reduced in the feeding operation of 6450 rail pieces with large batches, the extreme running state of the equipment is improved, the running working condition of the equipment is more scientific and reasonable, the daily use loss degree of the equipment is greatly reduced, the production is further stabilized, the use efficiency of the equipment is improved, and the use condition is optimized.
3. After the method is implemented, the basic coverage of the heel-end profiling rail product with the thickness of less than 6 meters is smoothly realized, the controllability of a daily production operation plan is greatly improved, the material utilization rate of the conventional rail is greatly improved, and the method plays a positive role in improving the operating benefits of companies, reducing cost and improving efficiency.
4. The invention improves the material utilization rate of 25 meters of the rail piece raw material by AT least 3 percent, 50AT raw materials per year account for 1 ten thousand tons, and the purchasing cost of each ton of steel rail is calculated by 0.8 ten thousand yuan, thus saving the purchasing cost of the steel rail by about 240 ten thousand yuan due to direct economic benefit.
5. The invention has the characteristics of reasonable structure, simplicity, practicability, strong universality, convenience for installation and maintenance and the like; the forging die is suitable for a steel rail turnout precision forging process production line and can be widely applied to the field of forging of the heel end of a steel rail piece; in the turnout industry, the invention can promote the application level of the composite extrusion process again, provides an active demonstration case for the application mode of the furnace front feeding mechanism in the industry, and has important significance for promoting the equipment application in the industry and promoting the turnout processing process; is suitable for popularization.
Drawings
FIG. 1 is a diagram of a normal 1000 heating length state of the method of the present invention.
FIG. 2 is a view showing the position of the front feed 0 moving forward 230 toward the forming section in the method of the present invention.
FIG. 3 is a diagram showing the position of a fire rail after the fire rail is charged in the furnace according to the method of the present invention.
FIG. 4 is a drawing showing the position of a rail member after tapping in accordance with the method of the present invention.
FIG. 5 is a diagram showing the position of a second fire rail after the second fire rail is charged in the furnace according to the method of the present invention.
FIG. 6 is a drawing showing the position of a first and second rail members after tapping in the method of the present invention.
FIG. 7 shows a normal 1000 heating length state of the second method of the present invention.
FIG. 8 is a diagram showing the state of the furnace body 230 of the intermediate frequency heating furnace adjusted to the direction of the raw material according to the method of the present invention.
FIG. 9 is a diagram showing the position of a first rail member after the introduction of the furnace in the second method of the present invention.
FIG. 10 is a view showing the position of a rail member after tapping in accordance with the second aspect of the present invention.
FIG. 11 is a diagram showing the position of a second fire rail after the second fire rail is charged in the furnace according to the method of the present invention.
FIG. 12 is a drawing showing the position of the second rail member after tapping in the method of the present invention.
Detailed Description
Specific embodiments of the present invention are described below with reference to fig. 1-12.
The following examples are given to facilitate a better understanding of the invention, but do not limit the invention. The following examples are only a part of the present invention, and not all of them. The components and materials used in the following examples are commercially available unless otherwise specified. The devices used in the following examples are all conventional devices.
A steel rail utilization rate improving method based on a heel end finish forging line is characterized by comprising the following steps:
(as shown in fig. 1) method 1, adjusting the 0 point position of the stokehold feeding mechanism towards the forming section, and moving Lmm the 0 point position of the stokehold feeding mechanism from the farthest stroke to the forming section; the heating length is shortened Lmm from the original.
In the above embodiment, further: the Lmm is 230 mm.
In the above embodiment, further: the method 1 comprises
(as shown in fig. 2) the position of the 0 point of the stokehold feeding mechanism is adjusted towards the forming section, and the position of the 0 point of the stokehold feeding mechanism is moved Lmm from the farthest stroke to the forming section.
(as shown in FIG. 3) adjusting and shortening a stokehold feed stroke length Lmm;
(as shown in FIG. 4) adjusting the feeding stroke length of a fire before discharging to 1300 mm;
(as shown in FIG. 5) adjusting the feeding stroke length of the second fire before entering the furnace to be 1300;
(as shown in fig. 6) the length of the feed stroke before the two-fire furnace is fed into the furnace is adjusted to 1300.
In the above embodiment, further: the method 1 comprises
Moving the position point 0 of the stokehold feeding mechanism to the forming section from the farthest stroke by a length Lmm;
the feeding length is reduced Lmm, and the heating length of the rail member entering the hearth is unchanged;
the stokehole feeding stroke is increased Lmm to reach the foremost end of the feeding stroke of the feeding mechanism;
the feeding mechanism drags the tapping position of the steel rail during tapping to move back Lmm towards the direction of the raw material;
the shortest length of the original rail piece is shortened Lmm;
when the second fire enters the furnace, the feeding stroke in front of the furnace is increased by Lmm;
the heating length of the second fire is different from that of the first fire, and the heating length of the second fire can only be shortened but can not be lengthened.
In the specific implementation:
the method comprises the following steps: and adjusting the position of the 0 point of the feeding mechanism in front of the furnace to the forming section direction, moving the position to the forming section by 230mm from the farthest stroke 1300 point, modifying the heating length from the original 1000mm to 1000 and 230=770mm, and adjusting the shortest length of the rail member to 5190 mm.
In the actual heating process of the rail piece with the shortest length, the heating is realized by setting the 0-position of the stokehold feeding mechanism, the furnace body does not need to be moved, the infrared 0-position positioning point (originally 100 intervals) does not need to be moved, and the theoretical shortest length of the rail piece is 5190.
The concrete measures are as follows:
1. adjusting the position of a 0 point of a feeding mechanism in front of the furnace to the direction of the forming section, and moving the position of the feeding mechanism to the forming section by 230mm from a 1300 point of the farthest stroke;
2. adjusting the length of a feeding stroke of a fire before entering the furnace to 1070 mm;
3. adjusting the feeding stroke degree of a first fire before discharging to 1300 mm;
3. adjusting the length of a feeding stroke of the second fire before entering the furnace to be 1300 mm;
4. adjusting the length of a feeding stroke of the second fire before entering the furnace to be 1300 mm;
moving the 0 position of the furnace front feeding mechanism 230mm from the farthest stroke 1300 point to the forming section, wherein the feeding length is set to be 1000 +230 =770mm, namely the heating length of the rail piece entering the hearth is still 770mm, at the moment, the furnace front feeding stroke moves 770+300=1070mm, the front end of the feeding stroke of the feeding mechanism is reached, the discharging position of the feeding mechanism dragging the steel rail to discharge from the furnace is not the original 0 position any more, but the original 1300mm farthest stroke point, namely the purpose that the steel rail moves 230mm backward in the direction of the original material is realized, and the shortest length 5420 (which is a known value before modification) of the original rail piece is changed into 5420 +230 = 5190;
when the second fire is fed into the furnace, the stokehole feeding stroke is 770+230+300=1300mm, and the value is automatically supplemented with an excess part system with the set heating length of 770 mm. Of course, the heating length of the two fire can be different from the setting length of the one fire (but the heating length can be only shortened and cannot be lengthened), and can also be set to be 720mm (the stokehole feeding stroke is 720+230+300=1250 mm) or 800mm (the stokehole feeding stroke is 800+230+300=1330mm, and the setting is invalid) so as to fully adjust the rail heating manufacturability.
Method 2, adjusting the furnace body Lmm of the intermediate frequency heating furnace towards the direction of the raw material; the infrared 0-position positioning point and the furnace body synchronously move towards the raw material direction Lmm.
In the specific implementation: (as shown in FIG. 8) adjusting the furnace body of the intermediate frequency heating furnace to 230mm towards the raw material direction; the infrared 0-position positioning point and the furnace body synchronously move 230 towards the raw material direction, and the distance between 200 and 100 of the infrared 0-position positioning point and the furnace body is kept unchanged;
the maximum stokehole feeding stroke is 1300mm (the distance between the 0 site of the stokehole feeding mechanism and the No. 1 feeding frame), and the guide longitudinal length of the stokehole front end is 200 mm; the distance between the infrared 0-position positioning point and the guide outer end is adjustable within 0-300 mm; when upsetting is carried out, the actual heating length is 1000-1050 mm, and the distance is 30-50 mm; when the amount of the excess metal of the raw material is small, such as 60AT2-60, the actual heating length is 900-950, and the spacing is 100-150; the amount of the redundant metal of the raw material is continuously less, for example, 60-50, the heating length is 770mm, and the distance is adjusted to 80-120; the raw material has a large amount of redundant metal, such as 60AT1-60, the actual heating length is 800, and the distance is 130-150; and so on.
From the above description it can be found that: on the basis of not changing the overall scheme of stokehole feeding operation, the shortest feeding length of a feeding system is greatly increased from 6450 to 5190 according to the length of a rail forging product, the application bottleneck of an automatic production line of a rail heel end in the industry is broken through, and the utilization rate of the rail is improved.
In daily use, the shortest feeding length of the feeding equipment is improved to 5190, so that the unbalance loading degree of a feeding system is greatly reduced in the feeding operation of 6450 rail pieces with large batches, the extreme running state of the equipment is improved, the running working condition of the equipment is more scientific and reasonable, the daily use loss degree of the equipment is greatly reduced, the production is further stabilized, the use efficiency of the equipment is improved, and the use condition is optimized.
After the method is implemented, the basic coverage of the heel-end profiling rail product with the thickness of less than 6 meters is smoothly realized, the controllability of a daily production operation plan is greatly improved, the material utilization rate of the conventional rail is greatly improved, and the method plays a positive role in improving the operating benefits of companies, reducing cost and improving efficiency.
The invention improves the material utilization rate of 25 meters of the rail piece raw material by AT least 3 percent, 50AT raw materials per year account for 1 ten thousand tons, and the purchasing cost of each ton of steel rail is calculated by 0.8 ten thousand yuan, thus saving the purchasing cost of the steel rail by about 240 ten thousand yuan due to direct economic benefit.
The invention has the characteristics of reasonable structure, simplicity, practicability, strong universality, convenience for installation and maintenance and the like; the forging die is suitable for a steel rail turnout precision forging process production line and can be widely applied to the field of forging of the heel end of a steel rail piece; in the turnout industry, the invention can promote the application level of the composite extrusion process again, provides an active demonstration case for the application mode of the furnace front feeding mechanism in the industry, and has important significance for promoting the equipment application in the industry and promoting the turnout processing process; is suitable for popularization.
In conclusion, on the basis of not changing the overall scheme of stokehole feeding operation, the shortest feeding length of a feeding system is greatly increased from 6450 to 5190 according to the length of a rail forging product, the industrial bottleneck is broken through, and the utilization rate of the steel rail is improved.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description is described in terms of one embodiment, this embodiment does not include only a single embodiment, but such description is merely for clarity, and those skilled in the art will recognize that the embodiments described in this embodiment can be combined as appropriate to form other embodiments as would be understood by those skilled in the art.
The above-mentioned embodiments are merely preferred embodiments of the present invention, which are not intended to limit the scope of the present invention, and therefore, all equivalent changes made by the contents of the claims of the present invention should be included in the claims of the present invention.
Claims (4)
1. A steel rail utilization rate improving method based on a heel end finish forging line is characterized by comprising the following steps:
method 1, adjusting the position of 0 point of a stokehold feeding mechanism towards the direction of a forming section, and moving Lmm the position of 0 point of the stokehold feeding mechanism from the farthest stroke to the forming section; the heating length is shortened from the original Lmm;
method 2, adjusting the furnace body Lmm of the intermediate frequency heating furnace towards the direction of the raw material; the infrared 0-position positioning point and the furnace body synchronously move towards the raw material direction Lmm.
2. The method for improving the utilization rate of the steel rail based on the heel end finish forging line according to claim 1, wherein the method comprises the following steps: the Lmm is 230 mm.
3. The method for improving the utilization rate of the steel rail based on the heel end finish forging line according to claim 1, wherein the method comprises the following steps: the method 1 comprises
Adjusting the 0 point position of the stokehole feeding mechanism towards the forming section direction, and moving Lmm the 0 point position of the stokehole feeding mechanism from the farthest stroke to the forming section;
adjusting and shortening the feeding stroke length Lmm before the fire enters the furnace;
adjusting the length of a feeding stroke of a first fire before discharging to 1300 mm;
adjusting the length of a feeding stroke of the second fire before entering the furnace to be 1300;
the length of the feeding stroke of the second fire before entering the furnace is adjusted to 1300.
4. The method for improving the utilization rate of the steel rail based on the heel end finish forging line according to claim 1, wherein the method comprises the following steps: the method 1 comprises
Moving the position point 0 of the stokehold feeding mechanism to the forming section from the farthest stroke by a length Lmm;
the feeding length is reduced Lmm, and the heating length of the rail member entering the hearth is unchanged;
the stokehole feeding stroke is increased Lmm to reach the foremost end of the feeding stroke of the feeding mechanism;
the feeding mechanism drags the tapping position of the steel rail during tapping to move back Lmm towards the direction of the raw material;
the shortest length of the original rail piece is shortened Lmm;
when the second fire enters the furnace, the feeding stroke in front of the furnace is increased by Lmm;
the heating length of the second fire is different from that of the first fire, and the heating length of the second fire can only be shortened but can not be lengthened.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110217827.8A CN113020532B (en) | 2021-02-26 | 2021-02-26 | Steel rail utilization rate improving method based on heel end finish forging line |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110217827.8A CN113020532B (en) | 2021-02-26 | 2021-02-26 | Steel rail utilization rate improving method based on heel end finish forging line |
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| CN113020532A true CN113020532A (en) | 2021-06-25 |
| CN113020532B CN113020532B (en) | 2024-02-27 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62158820A (en) * | 1986-01-07 | 1987-07-14 | Fuji Electric Co Ltd | Transferring apparatus for billet in billet heater |
| CN1075438A (en) * | 1992-02-19 | 1993-08-25 | 河北省冶金设计研究院 | A kind of continuous-heating furnace for forging |
| CN202208869U (en) * | 2011-07-20 | 2012-05-02 | 铁道第三勘察设计院集团有限公司 | Urban rail traffic engineering line track symmetrical three-throw turnout |
| KR20130021915A (en) * | 2011-08-24 | 2013-03-06 | 주식회사 금강 | Roll forming apparatus for long-rail frame |
| CN103540736A (en) * | 2013-09-22 | 2014-01-29 | 中铁宝桥集团有限公司 | Heat treatment method and heat treatment method for steel rail profiling heel end section |
| KR20140023800A (en) * | 2012-08-17 | 2014-02-27 | (주)삼현피에프 | Feeding apparatus in putting precast girder on piers with back feeding using beam launcher and method using same |
| CN203700436U (en) * | 2013-09-22 | 2014-07-09 | 中铁宝桥集团有限公司 | Device for carrying out heat treatment on steel rail briquetting root-end section |
| CN108486346A (en) * | 2018-05-31 | 2018-09-04 | 湖南智汇科技有限公司 | A kind of forging and stamping section normalizing of rail and end hardening multiple treating system |
-
2021
- 2021-02-26 CN CN202110217827.8A patent/CN113020532B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62158820A (en) * | 1986-01-07 | 1987-07-14 | Fuji Electric Co Ltd | Transferring apparatus for billet in billet heater |
| CN1075438A (en) * | 1992-02-19 | 1993-08-25 | 河北省冶金设计研究院 | A kind of continuous-heating furnace for forging |
| CN202208869U (en) * | 2011-07-20 | 2012-05-02 | 铁道第三勘察设计院集团有限公司 | Urban rail traffic engineering line track symmetrical three-throw turnout |
| KR20130021915A (en) * | 2011-08-24 | 2013-03-06 | 주식회사 금강 | Roll forming apparatus for long-rail frame |
| KR20140023800A (en) * | 2012-08-17 | 2014-02-27 | (주)삼현피에프 | Feeding apparatus in putting precast girder on piers with back feeding using beam launcher and method using same |
| CN103540736A (en) * | 2013-09-22 | 2014-01-29 | 中铁宝桥集团有限公司 | Heat treatment method and heat treatment method for steel rail profiling heel end section |
| CN203700436U (en) * | 2013-09-22 | 2014-07-09 | 中铁宝桥集团有限公司 | Device for carrying out heat treatment on steel rail briquetting root-end section |
| CN108486346A (en) * | 2018-05-31 | 2018-09-04 | 湖南智汇科技有限公司 | A kind of forging and stamping section normalizing of rail and end hardening multiple treating system |
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|---|---|
| CN113020532B (en) | 2024-02-27 |
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