CN117463768A - Hot rolling method for train braking Liang Quanlian rolling based on small square billets - Google Patents
Hot rolling method for train braking Liang Quanlian rolling based on small square billets Download PDFInfo
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- CN117463768A CN117463768A CN202311746663.3A CN202311746663A CN117463768A CN 117463768 A CN117463768 A CN 117463768A CN 202311746663 A CN202311746663 A CN 202311746663A CN 117463768 A CN117463768 A CN 117463768A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 104
- 238000005098 hot rolling Methods 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 title claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 26
- 239000010959 steel Substances 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims description 14
- 239000002184 metal Substances 0.000 claims description 6
- 238000005266 casting Methods 0.000 claims description 3
- 239000000498 cooling water Substances 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 3
- 238000013461 design Methods 0.000 description 5
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/08—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel
- B21B1/12—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling structural sections, i.e. work of special cross-section, e.g. angle steel in a continuous process, i.e. without reversing stands
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Metal Rolling (AREA)
Abstract
The invention discloses a hot rolling method for train braking Liang Quanlian rolling based on small square billets, which comprises the following steps: (1) Pushing out the steel billet heated to the preset temperature from the heating furnace, and performing cogging rolling on the steel billet for 6-9 passes by adopting a horizontal rolling mill to form a small square billet; (2) And carrying out continuous rolling for 6-7 times on the small square billets which are subjected to primary rolling by the transverse rolling mill by adopting a horizontal-vertical alternating continuous rolling unit. The invention adopts the hot rolling mode of horizontal type and Ping Lijiao alternative type full continuous rolling and the redesigned hole type structure to produce the train brake beam, and the continuous rolling machine set is used for continuous and rapid rolling, so that the rolling efficiency and the yield of the product are greatly improved, the rolling efficiency is greatly improved, the stability and the uniformity of the finished product are also greatly improved, the rolling cost is reduced, and the economic benefit is increased.
Description
Technical Field
The invention relates to a continuous hot rolling method of train brake beam deformed steel, in particular to a hot rolling method of train brake Liang Quanlian rolling based on small square billets, and belongs to the technical field of metallurgy.
Background
Along with the rapid development of economy, the transportation industry in China also obtains huge development opportunities, but the rapidly-increased freight traffic is not in direct proportion to the traffic of freight trains in operation at present, and the freight train is mainly characterized in that the original brake beams made of channel steel and round steel are not suitable for the requirements of the accelerated trains, and are difficult to load large-tonnage and high-speed novel trains, so that integrally-formed train brake beams are developed, and the train brake beams adopt low-alloy high-strength structural steel and have the characteristics of low alloy, high strength and high toughness. However, the traditional train brake beam is rolled only on a horizontal rolling mill, and the rolled finished product has the defects of low rolling efficiency, poor precision, low steel stability and the like, and cannot meet the production requirement of the novel train brake beam.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a hot rolling method for train braking Liang Quanlian rolling based on small square billets, which has the characteristics of reasonable design, high rolling efficiency and good stability and uniformity of finished products produced, thereby overcoming the defects in the prior art.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a hot rolling method of train brake Liang Quanlian rolling based on billets, comprising the steps of:
(1) Pushing out the steel billet heated to the preset temperature from the heating furnace, and performing cogging rolling on the steel billet for 6-9 passes by adopting a horizontal rolling mill to form a small square billet;
(2) And carrying out continuous rolling for 6-7 times on the small square billets which are subjected to primary rolling by the horizontal rolling mill by adopting a horizontal-vertical alternating continuous rolling unit, wherein: the No. 1 rolling mill is a pre-opening type, small square blanks are rolled into a train brake beam steel blank in advance, and the upper roller hole patterns and the lower roller hole patterns are designed into hole pattern asymmetric patterns; the No. 2 rolling mill further pre-opens the concrete shape required by the steel hole type of the train brake beam, thereby creating conditions for the continuous deformation of the next pass; the 3# rolling mill hole is a closed hole, and the metal flow directions of the head part, the tail part and the leg part of the train brake beam steel hole in the rough rolling process are further distributed; the pass of the No. 4 rolling mill is symmetrically arranged up and down, and the shape of the pass is similar to that of the cap-shaped hole; the 5# rolling mill hole is a closed hole, the shape is similar to that of two wedges which simultaneously cut into a rolled piece, and the head and the tail are cut deeply; the rolling mills No. 6 and No. 7 are vertical rolling mills, and the pass is an open pass.
As a preferable scheme, in the step (1), the casting of the roller cooling water onto the steel billet is avoided, the temperature of the rolled piece is reduced, and the rolling temperature during continuous rolling is ensured.
As a preferable scheme, the rolling mill No. 2 in the step (2) adopts a mode of vertical reduction and lateral pressure to increase the deformation of a rolled piece; the deformation of the rolled piece is increased by adopting a mode of vertical pressing and lateral pressing of the No. 3 rolling mill; the No. 4 rolling mill controls the metal required for the head and tail by side pressing and vertical pressing.
As a preferable scheme, the elongation coefficient and the rolling reduction of the left side and the right side of each pass hole type of each frame in the continuous rolling unit in the step (2) are kept equal.
As a preferable scheme, in the step (2), the widths of the left side and the right side of the 6# rolling mill and the 7# rolling mill are equal, and the widths are equal.
The beneficial effects are that: compared with the prior art, the rolling efficiency and the yield of the product are greatly improved by continuously and rapidly rolling the train brake beam through the brand-new full continuous rolling hot rolling mode of the transverse rolling unit and the Ping Lijiao alternative rolling unit and the redesigned grooved structure, the stability and the uniformity of the finished product are also greatly improved, and the produced product has the characteristics of high stability, uniformity and dimensional accuracy, reduces the rolling cost and increases the economic benefit. The rolled train brake beam is of a special-shaped section, has the advantages of high purity, compact structure, good processability and excellent comprehensive performance, and simultaneously has good corrosion resistance, heat resistance, cold resistance and other performances, and meets the condition that the speed of a truck is 120 km/h. 15Mn for novel truck combined brake beam 2 CrVNbE steel with performance equivalent to that of low alloy high strength steel Q460E in GB/T1591-1994 has excellent comprehensive mechanical properties (yield strength Rel is more than or equal to 460N/mm) 2 The low-temperature impact toughness is minus 40 ℃ Akv is more than or equal to 27 and J), and the fatigue life is longer than 100 ten thousand times, and the weather resistance is strong and the service life is long.
Drawings
FIG. 1 is a diagram of a pass design of a train brake beam from a rolling mill train to a tandem mill train in accordance with the present invention;
fig. 2 is a finished hole pattern design of the train brake beam of the present invention.
Detailed Description
In order to further describe the technical means and effects adopted by the invention for achieving the preset aim, the following detailed description of the specific implementation, structure, characteristics and effects according to the invention is given with reference to the accompanying drawings and the preferred embodiment.
Example 1: the hot rolling method of train braking Liang Quanlian rolling based on small square billets, the finished train beam belongs to special-shaped materials, the second flow of each frame on a continuous rolling unit must be ensured to be equal, and the pile-up and pulling steel phenomenon is reduced or eliminated; meanwhile, the extension coefficient and the rolling reduction of the left side and the right side of each pass hole type of each frame on the continuous rolling unit are kept equal, so that the rolling piece is prevented from twisting.
The method comprises the following steps:
and pushing the 160 square billets heated to the preset temperature out of the heating furnace, entering a horizontal rolling mill, performing 6-9 times of cogging rolling to form small square billets (shown in fig. 1 (a)), and simultaneously avoiding casting roller cooling water on the billets, reducing the temperature of rolled pieces and ensuring the entering rolling temperature when entering continuous rolling.
And (3) carrying out continuous rolling for 6-7 times on the small square billets which are subjected to primary rolling by the horizontal rolling mill by adopting a horizontal-vertical alternating continuous rolling unit:
first rack: as shown in fig. 1 b, the # 1 rolling mill pre-opens a hole for a train brake beam steel (hereinafter referred to as cross beam steel), pre-rolls a small square billet into a rudiment of the cross beam steel, and creates conditions for the continuous deformation of the next pass. At the moment, the rolled piece has high temperature, little deformation, small resistance, larger uneven deformation quantity, larger rolling reduction and asymmetric hole patterns of the upper roller and the lower roller.
Second rack: as shown in fig. 1 (c), the rolling mill # 2 further pre-opens the specific shape required by the steel pass of the cross beam, and provides for the continuous deformation of the next pass. The pass section is large, the head and the leg are in the earlier stage of modeling, and the deformation of the rolled piece is increased by adopting the modes of vertical pressing and lateral pressing to reach the target shape.
Third rack: as shown in fig. 1 (d), the 3# rolling mill pass is a closed pass, and further distributes the metal flow directions of the head, tail and leg of the cross beam steel pass in the rough rolling process. At the moment, the temperature of the rolled piece is high, the section is relatively large, the deformation resistance is small, and relatively uneven deformation can be ensured. Meanwhile, the pass section is large, the head and the leg are not formed, and the deformation of the rolled piece is increased by adopting the modes of vertical pressing and lateral pressing.
Fourth rack: as shown in fig. 1 (e), the pass of the 4# rolling mill is symmetrically arranged up and down, the shape of the pass is similar to that of a cap-shaped hole, and the metal required for controlling the head part and the tail part is pressed down by side pressure and vertical pressure. In addition, the leg can be ensured to have a wider height dimension.
Fifth time: as shown in fig. 1 (f), the 5# rolling mill hole is a closed hole, the shape is similar to that of two wedges which cut into the rolled piece at the same time, and the head and the tail are cut deep, at the moment, the rolling piece has large rolling reduction, forced expansion exists, the hole expansion is large, and the rolled piece obtains a rudiment which is close to the shape of a finished product through the wedge hole.
Sixth and seventh frames: as shown in fig. 1 (g) and (h), the last two rolling mills 6# and 7# are vertical rolling mills, and in order to ensure the shape and the size of the head, the tail and the legs and the flatness of the rolled piece, the extension of the head and the tail are required to be adjusted to be equal, the reduction and the widening of the rolling mills are not required to be excessive, and the reduction of the cutting depth wedge is required to be kept uniform. Meanwhile, in order to ensure that the leg insertion of the rolled piece is free from blocking, the rolled piece is better processed and molded, and the leg size and the waist reduction of the tail part are properly increased. The size design of the finished product is set according to the standard size of the product, the tail and the leg with the minimum thickness are the parts with the fastest cooling, and the shrinkage rate of the rolled piece should be considered during the design.
The present invention is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present invention.
Claims (5)
1. A hot rolling method of train braking Liang Quanlian rolling based on billets, comprising the steps of:
(1) Pushing out the steel billet heated to the preset temperature from the heating furnace, and performing cogging rolling on the steel billet for 6-9 passes by adopting a horizontal rolling mill to form small square billets;
(2) And carrying out continuous rolling for 6-7 times on the small square billets which are subjected to primary rolling by the horizontal rolling mill by adopting a horizontal-vertical alternating continuous rolling unit, wherein: the No. 1 rolling mill is a pre-opening type, small square blanks are rolled into a train brake beam steel blank in advance, and the upper roller hole patterns and the lower roller hole patterns are designed into hole pattern asymmetric patterns; the No. 2 rolling mill further pre-opens the concrete shape required by the steel hole type of the train brake beam, thereby creating conditions for the continuous deformation of the next pass; the 3# rolling mill hole is a closed hole, and the metal flow directions of the head part, the tail part and the leg part of the train brake beam steel hole in the rough rolling process are further distributed; the pass of the No. 4 rolling mill is symmetrically arranged up and down, and the shape of the pass is similar to that of the cap-shaped hole; the 5# rolling mill hole is a closed hole, the shape is similar to that of two wedges which simultaneously cut into a rolled piece, and the head and the tail are cut deeply; the rolling mills No. 6 and No. 7 are vertical rolling mills, and the pass is an open pass.
2. The hot rolling method of billet based train brake Liang Quanlian rolling of claim 1 wherein: in the step (1), the casting of the roller cooling water onto the steel billet is avoided, the temperature of the rolled piece is reduced, and the rolling temperature during continuous rolling is ensured.
3. The hot rolling method of billet based train brake Liang Quanlian rolling of claim 1 wherein: the deformation of the rolled piece is increased by adopting a mode of vertical pressing and lateral pressing of the No. 2 rolling mill in the step (2); the deformation of the rolled piece is increased by adopting a mode of vertical pressing and lateral pressing of the No. 3 rolling mill; the No. 4 rolling mill controls the metal required for the head and tail by side pressing and vertical pressing.
4. The hot rolling method of billet based train brake Liang Quanlian rolling of claim 1 wherein: and (3) in the step (2), the extension coefficients and the rolling reduction of the left side and the right side of each pass of each frame on the continuous rolling unit are kept equal.
5. The hot rolling method of billet based train brake Liang Quanlian rolling of claim 1 wherein: in the step (2), the expansion amounts of the left side and the right side of the 6# rolling mill and the 7# rolling mill are equal, and the expansion amounts are equal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311746663.3A CN117463768A (en) | 2023-12-19 | 2023-12-19 | Hot rolling method for train braking Liang Quanlian rolling based on small square billets |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311746663.3A CN117463768A (en) | 2023-12-19 | 2023-12-19 | Hot rolling method for train braking Liang Quanlian rolling based on small square billets |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117463768A true CN117463768A (en) | 2024-01-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311746663.3A Pending CN117463768A (en) | 2023-12-19 | 2023-12-19 | Hot rolling method for train braking Liang Quanlian rolling based on small square billets |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117463768A (en) |
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2023
- 2023-12-19 CN CN202311746663.3A patent/CN117463768A/en active Pending
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