CN111889518A - Water-saving roll pass surface cooling device, manufacturing method and rolling mill set - Google Patents
Water-saving roll pass surface cooling device, manufacturing method and rolling mill set Download PDFInfo
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- CN111889518A CN111889518A CN202010783084.6A CN202010783084A CN111889518A CN 111889518 A CN111889518 A CN 111889518A CN 202010783084 A CN202010783084 A CN 202010783084A CN 111889518 A CN111889518 A CN 111889518A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/10—Lubricating, cooling or heating rolls externally
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B27/00—Rolls, roll alloys or roll fabrication; Lubricating, cooling or heating rolls while in use
- B21B27/06—Lubricating, cooling or heating rolls
- B21B27/10—Lubricating, cooling or heating rolls externally
- B21B2027/103—Lubricating, cooling or heating rolls externally cooling externally
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Abstract
The invention discloses a water-saving type roll pass surface cooling device, a manufacturing method and a rolling mill unit, belonging to the technical field of metallurgy and aiming at the defect that the prior cooling device causes large water resource waste when cooling the roll pass surface of a hot roll of a rolling mill. The manufacturing method comprises the following steps: preparing raw materials, cutting and blanking, bending and forming, welding and combining and fixing the flexible medium. The rolling mill set comprises a plurality of groups of rolling mills, each group of rolling mills comprises rollers which are arranged in an up-down symmetrical mode, each roller is provided with a matched roller pass, and a cooling device is arranged in each roller pass. The invention changes the original water spray cooling mode into the water seepage cooling mode, thereby effectively avoiding the waste of a large amount of water resources.
Description
The technical field is as follows:
the invention belongs to the technical field of cooling equipment for metallurgical steel rolling, and particularly relates to a water-saving type roll pass surface cooling device, a manufacturing method and a steel rolling mill unit.
Background art:
the temperature of rolled pieces rolled in the steel rolling production process of a rolling mill hot roll used for hot pressure processing in the metallurgical industry is about 1000 ℃. In order to cool the surface of the roll pass contacting the rolled piece, the cooling method adopted at present is water spray cooling, namely, a cooling device is arranged at a position 50-100mm away from the surface of the roll pass to spray cooling water on the surface of the roll pass. The cooling mode not only wastes a large amount of water resources, but also cools the hole pattern surface of the roller, simultaneously, the cooling water of the upper roller is poured on the upper surface of the rolled piece, so that the surface layer of the rolled piece in a high-temperature state is rapidly cooled, and the generated iron scale is generated, and is pressed into the surface of the steel to influence the surface quality when the iron scale is rolled in the next pass. Meanwhile, the water quantity of the cooling water of the upper roller poured on the upper surface of the rolled piece is large, so that the temperature of the upper surface of the rolled piece is lower than that of the lower surface, and an upward warping head is easily formed during rolling deformation, so that a steel piling accident is generated.
The invention content is as follows:
the invention provides a water-saving type roll pass surface cooling device, a manufacturing method and a rolling mill unit, aiming at solving the current situation that the prior cooling device causes large water resource waste when cooling the roll pass surface of a hot roll of a rolling mill.
The technical scheme adopted by the invention is as follows: a water-saving roll pass surface cooling apparatus comprising: the cooling device body is arranged on the surface of the roll pass, the cooling device body is in contact with the surface of the roll pass, the bottom of the cooling device body is provided with a cooling medium seepage hole, and the cooling medium seeped from the seepage hole realizes the cooling effect on the surface of the roll pass.
Preferably, a flexible medium is fixed at the bottom of the cooling device body, and the flexible medium is wetted by the seeped cooling medium and then performs a cooling effect on the pass surface of the roller.
Preferably, the cooling device body is formed by enclosing a lower contact plate, an upper non-contact plate and two side end plates together, and a hollow cavity is formed in the cooling device body; the two ends of the hollow cavity are respectively communicated with an input water pipe and an output water pipe, and the input water pipe and the output water pipe form a continuously flowing cooling medium channel in the cooling device body.
Preferably, the length L of the lower contact plate is 1/3 the arc length corresponding to the minimum working diameter R of the roll.
Preferably, the length L1 of the upper non-contact plate is 1/3 of the arc length corresponding to the diameter D of the roll collar of the roll.
Preferably, the width b of the upper non-contact plate is not more than the outer opening width b1 of the roll pass.
Preferably, the cooling device body and the roll pass have the same shape, and are in any one of a box shape, an oval shape, and a circular shape.
A method for manufacturing a cooling device comprises the following steps:
step 5, fixing the flexible medium: the flexible medium is adhered to the lower contact plate by an adhesive.
Preferably, in step 3, before the lower contact plate is bent, the two side edges with large deformation degree need to be cut into a plurality of openings, and the openings are welded after the lower contact plate is bent.
In order to solve the current situation that water resource waste is large when the existing rolling mill set is cooled, the invention adopts a water-saving roller hole type surface cooling device, changes the original water spray cooling mode into a water seepage type cooling mode, and effectively solves the problem of water resource waste.
A rolling mill unit comprises a plurality of rolling mills, each rolling mill comprises rollers which are symmetrically arranged up and down, each roller is provided with a matched roller pass, each roller pass is internally provided with a cooling device matched with the shape of an inner cavity of the roller pass, adjacent cooling devices on every two adjacent rolling mills are arranged in series, and the cooling device adopts the water-saving roller cooling device.
The invention has the beneficial effects that:
1. the cooling device designed by the invention is embedded in the roll pass, the original water spray cooling mode is changed into a water seepage cooling mode, and the high temperature of the surface of the roll pass contacting a high-temperature rolled piece is transferred to the cooling device through a contact conduction mode, so that the purpose of cooling the surface of the roll pass is achieved, namely, the waste of a large amount of water resources is effectively avoided, and the problem of iron scale generation caused by the fact that cooling water is poured onto the surface of the rolled piece is solved, particularly for steel types needing closed water rolling, the problem of cooling the surface of the roll pass is solved, and necessary conditions are provided for reducing the consumption of the roll and improving the surface quality of products.
2. In order to realize the close contact between the pass surface of the roller and the cooling device, the bottom of the cooling device is provided with a flexible medium, and the flexible medium is in contact with the pass surface of the roller, so that the purposes of flexible contact and close contact between the pass surface of the roller and the pass surface of the roller can be met, and the function of cooling can be realized.
3. The cooling device designed by the invention has the advantages of simple structure, convenience in manufacturing and convenience in operation.
4. The cooling device is applied to the rolling mill group, and the adjacent cooling devices are arranged in series, so that a cooling system of the whole rolling mill group is formed, and the whole cooling effect of the rolling mill group can be improved.
Description of the drawings:
FIG. 1 is a schematic view of the structure of a cooling apparatus according to the present invention;
FIG. 2 is a schematic view of FIG. 1 taken along line K;
FIG. 3 is a schematic view showing the positional relationship of the cooling device mounted on the rolling mill;
FIG. 4 is a cross-sectional view A-A of FIG. 3;
wherein: the cooling device comprises a cooling device 1, a cooling device body 10, a lower contact plate 11, an upper non-contact plate 12, a side end plate 13, an input water pipe 14, an output water pipe 15, an opening 16, a flexible medium 2, a roller 3, a roller pass 31 and a rolling mill 4.
The specific implementation mode is as follows:
example 1
As shown in fig. 1 and 2, a water-saving roll pass surface cooling apparatus 1 is mainly used in a long rolling mill 4 for rolling a symmetrical cross section, and the cooling apparatus 1 includes: the cooling device body 10 is arranged on the surface of the roll pass 31, the shape of the cooling device body 10 is the same as the shape of the inner cavity of the roll pass 31, and the cooling device body is matched with the inner cavity of the roll pass 31 in size, and the shape of the roll pass 31 is usually any one of simple box shape, oval shape and circular shape. Because the shape of the cooling device body 10 is the same as that of the inner cavity of the roll pass 31, the high temperature of the roll pass 31 can be transmitted to the cooling device body 10 when the cooling device 1 is in close contact with the surface of the roll pass 31, so that a good temperature conduction effect is achieved, and the purpose of timely cooling the surface of the roll pass 31 is achieved.
In order to keep the temperature of the cooling device body 10 at a low temperature, a continuously flowing cooling medium, which may be water or another liquid cooling medium, is required inside the cooling device body. This embodiment is described with reference to water as an example.
The cooling device body 10 is formed by enclosing a lower contact plate 11, an upper non-contact plate 12 and two side end plates 13 together, and a hollow cavity is formed in the cooling device body; an input water pipe 14 and an output water pipe 15 are respectively communicated with two ends of the hollow cavity, and the input water pipe 14 and the output water pipe 15 form a continuously flowing cooling medium channel in the cooling device body 10. The cooling water is supplied into the cooling device body 10 through an input water pipe 14 at one end of the cooling device body 10, and the cooling water after heat exchange is supplied out of the cooling device body 10 through an output water pipe 15 at the other end of the cooling device body 10, so that the cooling device body 10 is always kept at a low temperature.
4-6 fine seepage holes are uniformly formed in the lower contact plate 11, and a small amount of cooling water in the cooling device body 10 can flow out through the seepage holes to be contacted with the surface of the roll pass 31 so as to realize the purpose of cooling the roll pass 31; most of the cooling water can be selected according to actual requirements after flowing out. Firstly, the cooling water output from the cooling device body 10 can flow into the water source recovery device and can be recycled after being cooled, so that the waste of a large amount of water resources is reduced; and secondly, the cooling water output from the cooling device body 10 can be used as a water source for washing the iron scale to the cyclone tank, because the iron scale is generated in the rolling process of the rolling mill 4 when the long material in a high-temperature state is washed, and the water source is needed for washing the iron scale to the cyclone tank in order to ensure that the iron scale is washed to the cyclone tank.
Since the lower contact plate 11 needs to contact the roll pass 31 to achieve the cooling effect on the surface of the roll pass 31, the contact between the lower contact plate 11 and the roll pass 31 in the longitudinal direction is selected to be the largest possible, and therefore, the length L of the contact surface of the lower contact plate 11 is 1/3 of the arc length corresponding to the minimum working diameter R of the roll 3,
i.e. L1/3 pi R
In the formula: and R is the minimum working diameter of the roller.
Since the lower contact plate 11 and the surface of the roll pass 31 are in close contact in cross section, and the shape of the cross section must be the same as the shape of the inner cavity of the roll pass 31, the contact width B of the lower contact plate 11 should be blanked according to the arc length of the roll pass 31, and the width B is the diameter of the rolled piece
The corresponding arc length is 1/2 times the arc length,
namely, it is
In the formula:
is the diameter of the rolled piece.
Since the upper non-contact plate 12 needs to be embedded in the roll pass 31, its width b is not greater than the outer opening width b1 of the roll pass 31.
The length L1 of the upper non-contacting plate 12 is 1/3 of the arc length corresponding to the diameter D of the roll collar of the roll 3,
namely: l1 ═ 1/3 ═ pi ═ D
In the formula: d is the diameter of the roll collar of the roll.
Example 2
Example 3
A method of fabricating the cooling device of example 2, comprising the steps of:
in order to bring the cooling device body 10 into close contact with the surface of the roll pass 31 and achieve a good cooling effect, the sizes and shapes of the lower contact plate 11, the upper non-contact plate 12, and the side end plate 13 are determined according to the shape of the inner cavity of the roll pass 31, and the steel sheet is cut as required in the blanking size.
Step 21, cutting the lower contact plate 11
The lower contact plate 11 of the cooling device body 10 is in close contact with the surface of the roll pass 31, and in order to achieve the effect of cooling the surface of the roll pass 31, the contact between the lower contact plate 11 and the roll pass 31 in the longitudinal direction is as maximum as possible, and therefore, the length L of the lower contact plate 11 is 1/3 of the arc length corresponding to the minimum working diameter R of the roll 3,
namely: l1/3 pi R
In the formula: and R is the minimum working diameter of the roller.
To achieve intimate contact between the cooling device body 10 and the surface of the roll pass 31 in cross section, the cross sectional shape must conform to the shape of the interior cavity of the roll pass 31. Therefore, the width dimension B of the lower contact plate 11 should be blanked according to the arc length of the roll pass 31, and the width dimension B is the diameter of the rolled piece
The corresponding arc length is 1/2 times the arc length,
namely, it is
In the formula:
is the diameter of the rolled piece.
A plurality of seepage holes communicated with the inner cavity of the cooling device body 10 are uniformly formed in the lower contact plate 11, and the quantity of the seepage holes is 4-6 small holes so as to guarantee the supply of seepage cooling water.
Step 22, cutting the upper non-contact plate 12 pair
The upper non-contact plate 12 of the cooling device body 10 is not in contact with the roll pass 31, the upper non-contact plate 12 and the lower contact plate 11 together enclose to form a closed cross section, the length L1 of the upper non-contact plate 12 is 1/3 of the arc length corresponding to the roll collar diameter D of the roll 3,
namely: l1 ═ 1/3 ═ pi ═ D
In the formula: d is the diameter of the roll collar of the roll.
The width b of upper non-contact plate 12 is matched to the outer opening width b1 of roll pass 31, and since the thickness of flexible medium 2 is reserved, the width b of upper non-contact plate 12 should be no greater than the outer opening width b1 of roll pass 31.
Step 23, cutting the side end plate 13
The side end plate 13 is a closed container formed by closing both end faces of the lower contact plate 11 and the upper non-contact plate 12 after being combined, the cross-sectional area S of the side end plate 13 is the same as the shape of the roll pass 31,
namely:
in the formula:
is the diameter of the rolled piece.
Step 24, selection of input water pipe 14 and output water pipe 15
The input water pipe 14 and the output water pipe 15 are made of 6 minutes or 1 inch steel pipes, one end of each steel pipe is provided with a screw thread, and the input water pipe 14 and the output water pipe 15 are used as interfaces of the cooling water input and output cooling device body 10.
Step 25, selection of flexible media
In order to bring the cooling device body 10 into intimate contact with the roll pass 31, a flexible, abrasion resistant polyester material is used as the flexible medium and is bonded to the upper contact plate 11 with an adhesive.
firstly, carrying out cold bending forming on the lower contact plate 11 after blanking according to the shape of the roll pass 31, and then carrying out bending forming according to the radian corresponding to the minimum working diameter R of the roll; and then bending and forming the blanked upper non-contact plate 12 according to the radian corresponding to the diameter D of the roll collar of the roll.
firstly, welding a lower contact plate 11 and an upper non-contact plate 12 which are formed by cold bending with side end plates 13 respectively to form a closed cooling device body 10, then drilling through holes communicated with an inner cavity of the cooling device body 10 on the two side end plates 13 respectively, and finally welding and fixing one ends of an input water pipe 14 and an output water pipe 15 with screw threads with one through hole respectively.
Step 5, fixing the flexible medium
And adhering a flexible medium 2 to the lower contact plate 11 through an adhesive, wherein the flexible medium 2 is made of a flexible and wear-resistant polyester material.
Further, in step 3, before bending the lower contact plate 11, the two side edges with large deformation degree need to be cut into a plurality of openings 16, the distance between every two adjacent openings 16 is 100-150 mm, and the openings 16 are welded together after bending.
Production example
Taking a cooling device for manufacturing a 180-circle rolled by a 700-mill as an example, the specific manufacturing process is as follows:
1. blanking of lower contact plate 11
A. Size of the material to be cut
The steel plate with a thickness of 3mm was processed into a length L1/3 pi R1/3 pi 3.14 pi 580mm 607mm and a width L607 mm of the lower contact plate 11
And (6) blanking.
B. Cold roll forming
The lower contact plate 11 of the lower material is cold-formed according to the section shape of the 180-circle roll pass 31, then the two edges of the lower contact plate 11 with large deformation degree are cut into a plurality of openings 16, then the lower contact plate is bent and formed according to the radian corresponding to the minimum working diameter R of the roll 3 being 580mm, and finally the openings 16 are welded together after the lower contact plate is bent and formed.
C. Is provided with a water seepage hole
In order to wet the flexible medium 2 with the cooling water, 4 to 6 fine water seepage holes need to be uniformly drilled on the lower contact plate 11 to ensure the supply of the seepage water.
2. Blanking of upper non-contact plate 12
A. Size of the material to be cut
A steel plate having a thickness of 3mm was cut into a sheet having a length L1-1/3 pi D-1/3-3.14-750 mm-785 mm and a width of 3mm in the upper non-contact plate 12
And (6) blanking.
B. Cold roll forming
The upper non-contact plate 12 of the lower material is bent and formed in accordance with the radian corresponding to the diameter D of the roll collar of the roll being 750 mm.
3. Blanking of side end plate 13
A steel plate having a thickness of 5mm was blanked in accordance with the shape of the roll pass 31, and the area of the side end plate 13 was set
4. Pasting flexible medium material
The flexible medium 25 is adhered to the lower contact plate 11 by an adhesive.
Example 3
As shown in fig. 3 and 4, a rolling mill train includes a plurality of groups of rolling mills 4, each group of rolling mills 4 includes rollers 3 arranged symmetrically up and down, each roller 3 is provided with a matched roll pass 31, a cooling device 1 matched with the shape of the inner cavity of the roll pass 31 is arranged in each roll pass 31, and the cooling device 1 is suspended on the surface of the roll pass 31 through a fixing device. The cooling device 1 adopts the cooling device described in embodiment 1, and the adjacent cooling devices 1 on every two adjacent rolling mills 31 are arranged in series to form a cooling system of the roll pass 31 of the whole rolling mill group.
The above description is only a preferred embodiment of the present invention, and these embodiments are based on different implementations of the present invention, and the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A water-saving roll pass surface cooling apparatus comprising: the cooling device body (10) is arranged on the surface of the roll pass (31), the cooling device body (10) is in contact with the surface of the roll pass (31), a cooling medium seepage hole is formed in the bottom of the cooling device body (10), and the cooling medium seeped from the seepage hole realizes a cooling effect on the surface of the roll pass (31).
2. A water-saving roll pass surface cooling apparatus as claimed in claim 1, wherein: a flexible medium (2) is fixed at the bottom of the cooling device body (10), and the flexible medium (2) is wetted by the seeped cooling medium and then realizes a cooling effect on the surface of the roll pass (31).
3. A water-saving roll pass surface cooling apparatus as claimed in claim 1 or 2, wherein: the cooling device body (10) is formed by enclosing a lower contact plate (11), an upper non-contact plate (12) and two side end plates (13) together, and a hollow cavity is formed in the cooling device body; an input water pipe (14) and an output water pipe (15) are respectively communicated with two ends of the hollow cavity, and the input water pipe (14) and the output water pipe (15) form a continuously flowing cooling medium channel in the cooling device body (10).
4. A water-saving roll pass surface cooling apparatus as claimed in claim 3, wherein: the length L of the lower contact plate (11) is 1/3 of the arc length corresponding to the minimum working diameter R of the roller (3).
5. A water-saving roll pass surface cooling apparatus as claimed in claim 3, wherein: the length L1 of the upper non-contact plate (12) is 1/3 of the arc length corresponding to the diameter D of the roll collar of the roll (3).
6. A water-saving roll pass surface cooling apparatus as claimed in claim 3, wherein: the width b of the upper non-contact plate (12) is not more than the outer opening width b1 of the roll pass (31).
7. A water-saving roll pass surface cooling apparatus as claimed in claim 1, wherein: the cooling device body (10) and the roll pass (31) have the same shape, and are in any one of box shape, oval shape and round shape.
8. A method of manufacturing a cooling device according to claims 1 to 7, wherein: the method comprises the following steps:
step 1, preparing raw materials: selecting thin steel plates as raw materials of a lower contact plate (11), an upper non-contact plate (12) and a side end plate (13);
step 2, cutting and blanking: the sizes and the shapes of the lower contact plate (11), the upper non-contact plate (12) and the side end plate (13) are determined according to the shape of the inner cavity of the roll pass (31), and the thin steel plate is cut:
step 3, bending and forming: bending the cut lower contact plate (11) and the cut upper non-contact plate (12) into a curved shape;
step 4, welding and combining: firstly, welding a lower contact plate (11) and an upper non-contact plate (12) which are formed by cold bending with side end plates (13) respectively to form a closed cooling device body (10), then drilling through holes communicated with an inner cavity of the cooling device body (10) on the two side end plates (13) respectively, and finally welding and fixing one ends of an input water pipe (14) and an output water pipe (15) with the through holes respectively;
step 5, fixing the flexible medium: the flexible medium (2) is bonded to the lower contact plate (11) by an adhesive.
9. The method of manufacturing of claim 8, wherein: in the step 3, before the lower contact plate (11) is bent and formed, the two side edges with large deformation degree are cut into a plurality of openings (16), and the openings (16) are welded after the lower contact plate is bent and formed.
10. The utility model provides a rolling mill group, includes many rolling mills (4), and every rolling mill (4) all have been offered matched with roll pass (31), its characterized in that including roll (3) that the longitudinal symmetry set up on every roll (3): a cooling device (1) matched with the shape of the inner cavity of the roll pass (31) is arranged in each roll pass (31), adjacent cooling devices (1) on every two adjacent rolling mills (31) are arranged in series, and the cooling device (1) adopts the cooling device as claimed in claims 1 to 7.
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| CN202010783084.6A CN111889518A (en) | 2020-08-06 | 2020-08-06 | Water-saving roll pass surface cooling device, manufacturing method and rolling mill set |
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| CN202010783084.6A CN111889518A (en) | 2020-08-06 | 2020-08-06 | Water-saving roll pass surface cooling device, manufacturing method and rolling mill set |
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Application publication date: 20201106 |