CN110871218A - Intermediate billet descaling system, descaling process and steel rolling system - Google Patents
Intermediate billet descaling system, descaling process and steel rolling system Download PDFInfo
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- CN110871218A CN110871218A CN201911210386.8A CN201911210386A CN110871218A CN 110871218 A CN110871218 A CN 110871218A CN 201911210386 A CN201911210386 A CN 201911210386A CN 110871218 A CN110871218 A CN 110871218A
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- descaling
- guide
- guide portion
- billet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/34—Arrangements or constructional combinations specifically designed to perform functions covered by more than one of groups B21B39/02, B21B39/14, B21B39/20
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B39/00—Arrangements for moving, supporting, or positioning work, or controlling its movement, combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B39/14—Guiding, positioning or aligning work
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
Abstract
The application provides an intermediate billet descaling system, a descaling process and a steel rolling system, and relates to the technical field of steel billet descaling. The intermediate billet descaling system comprises a descaling machine, a conveying roller device and two guide centering devices, wherein the descaling machine is used for descaling the intermediate billet; the conveying roller device is used for conveying the intermediate blank to the descaler; the two guide centering devices are configured to guide the intermediate blank and center the intermediate blank, the two guide centering devices are respectively arranged at the first end and the second end of the conveying roller device, the direction from the first end to the second end is the conveying direction of the conveying roller device, so that the two ends of the intermediate blank can be simultaneously and respectively guided by the two guide centering devices, and the intermediate blank is conveyed into the descaling machine through the conveying roller device. The problem that the descaling effect of the intermediate billet square billet in the prior art is poor can be solved.
Description
Technical Field
The application relates to the technical field of steel blank descaling, in particular to an intermediate blank descaling system, a descaling process and a steel rolling system.
Background
In the production process of steel, in order to further improve the quality of steel, many customers require 'two fire' finished products, namely, a continuous casting blank is heated once and forms an intermediate blank after cogging, and then the intermediate blank is heated twice and rolled to form a finished product, the continuous casting blank is easily oxidized at high temperature to form iron scales, so that the heated continuous casting blank needs to be descaled to remove the iron scales, wherein the iron scales on the surface of the continuous casting blank can be removed by using high-pressure water of a descaling ring in a descaling machine, and the size of the descaling ring in the descaling machine is matched with that of the continuous casting blank so as to facilitate the continuous casting blank to pass through the descaling ring.
The method comprises the following steps that a continuous casting billet is reduced in size after cogging to form a small-sized intermediate billet square billet, the intermediate billet can be formed into a finished product after secondary heating and rolling, the intermediate billet can also generate scale in the heating process, the heated intermediate billet still needs to be subjected to descaling treatment, and the descaling effect of the intermediate billet is poor due to the fact that the size of a descaling ring in a descaling machine is matched with that of the continuous casting billet, the small-sized intermediate billet is often not on a central line when passing through the descaling ring in the descaling machine, the distances between the opposite two sides of the intermediate billet and the descaling ring are different, and the high-pressure water striking effect is different.
Disclosure of Invention
An object of the embodiment of the application is to provide an intermediate billet descaling system, a descaling process and a steel rolling system, which can solve the problem of poor intermediate billet descaling effect in the prior art.
In a first aspect, an embodiment of the present application provides an intermediate billet descaling system, which includes a descaler, a conveying roller device, and two guide centering devices, wherein the descaler is used for descaling an intermediate billet; the conveying roller device is used for conveying the intermediate blank to the descaler; the two guide centering devices are configured to guide the middle blank and center the middle blank, the two guide centering devices are respectively arranged at the first end and the second end of the conveying roller device, the direction from the first end to the second end is the conveying direction of the conveying roller device, so that the two guide centering devices can simultaneously guide the two ends of the middle blank respectively, and the middle blank is conveyed into the descaling machine through the conveying roller device.
In the technical scheme, the first end and the second end of the conveying roller device are respectively provided with one guide centering device, in a certain time period, the two guide centering devices can respectively guide the two ends of the intermediate blank on the conveying roller device, the intermediate blank is centered under the guide effect of the two guide centering devices, when the intermediate blank is continuously conveyed forwards by the conveying roller device, one end of the intermediate blank is separated from one guide centering device far away from the descaling machine, at the moment, because the two sides of the intermediate blank are restrained, the swing is not easy to generate, the centering position conveying is favorably kept, after the intermediate blank enters the descaling machine, the intervals in two opposite directions of the descaling rings in the intermediate blank and the descaling machine are the same, the intermediate blank is descaled under the high-pressure water effect of the descaling rings, the water pressures in the two opposite directions of the intermediate blank by the descaling rings are basically the same, and the descaling effect is good.
In a possible embodiment, the guiding and centering device comprises a supporting seat, a first guiding portion and a second guiding portion, wherein the first guiding portion and the second guiding portion are connected with the supporting seat, the first guiding portion and the second guiding portion have a distance, and the first guiding portion and the second guiding portion are used for respectively acting on two opposite sides of the intermediate blank to center the intermediate blank.
In above-mentioned technical scheme, the supporting seat provides the support for first guide part and second guide part, and first guide part and second guide part have the interval, and the intermediate blank can pass through between first guide part and the second guide part, acts on the relative both sides of intermediate blank respectively through first guide part and second guide part to make the intermediate blank centre.
In a possible embodiment, the ends of the first guide part and the second guide part, which are close to each other, are provided with rollers, the rotating shafts of the rollers are perpendicular to the plane of the conveying direction of the conveying roller device, and the rolling surfaces of the rollers are used for rolling contact with the intermediate blanks.
In the technical scheme, the rollers are arranged on the first guide part and the second guide part, when the intermediate blank passes through the gap between the roller of the first guide part and the roller of the second guide part, and the roller is in rolling contact with the intermediate blank when the intermediate blank is in contact with the roller of the first guide part and/or the roller of the second guide part, so that the quality damage to the surface of the intermediate blank can be reduced.
In a possible implementation scheme, the first guide part and the second guide part are rotatably connected with the supporting seat, the rotating axis lines of the first guide part and the second guide part are perpendicular to the plane where the conveying direction of the conveying roller device is located, and the first guide part and the second guide part can be fixed through the positioning assembly, so that the distance between the roller of the first guide part and the roller of the second guide part can be adjusted.
In the technical scheme, because first guide part, second guide part all with supporting seat rotatable coupling, the one end of first guide part and the one end homoenergetic of second guide part all can rotate relative to the supporting seat, the rotation axis line of first guide part and second guide part is perpendicular with the plane at transfer direction place of transfer roller device, when first guide part and second guide part rotate a certain position relative to the supporting seat, fix first guide part and second guide part through locating component, thereby can adjust the distance between the gyro wheel of first guide part and the gyro wheel of second guide part, thereby can be applicable to the intermediate billet of different specifications, the intermediate billet to different specifications leads and makes the intermediate billet placed in the middle.
In a possible implementation scheme, the first guide portion has a first mounting hole, the second guide portion has a second mounting hole, the supporting seat has a plurality of positioning holes, the positioning assembly includes a first positioning member and a second positioning member, the first positioning member can be inserted into one of the first mounting hole and the plurality of positioning holes to fix the first guide portion, and the second positioning member can be inserted into one of the second mounting hole and the plurality of positioning holes to fix the second guide portion.
In the above technical scheme, because the first mounting hole has been seted up to first guiding part, the second mounting hole has been seted up to the second guiding part, a plurality of locating holes have been seted up to the supporting seat, then wear to establish a locating hole in first mounting hole and a plurality of locating holes in proper order through first setting element and can be fixed in the supporting seat with first guiding part, wear to establish a locating hole in second mounting hole and a plurality of locating holes in proper order through the second setting element and can be fixed in the supporting seat with the second guiding part. The first fixing part and the second fixing part can be fixed at different positions through the matching of the first mounting hole and different positioning holes and the matching of the second mounting hole and different positioning holes.
In a possible embodiment, the positioning assembly includes a first positioning mechanism and a second positioning mechanism, both the first positioning mechanism and the second positioning mechanism are telescopic mechanisms, each telescopic mechanism includes a telescopic rod and a driving member for driving the telescopic rod to extend or retract, the driving member is mounted on the supporting seat, and the telescopic rod is hinged to the first guiding portion or the second guiding portion.
In above-mentioned technical scheme, stretch out or retract through driving piece drive telescopic link, and the telescopic link is articulated with first guide part or second guide part, then can be with first guide part and second guide part location in different positions to can adjust the distance between the gyro wheel of first guide part and the gyro wheel of second guide part.
In a possible embodiment, the distance between the surfaces of the rollers of the first guide part and the rollers of the second guide part which are close to each other can be adjusted within 200-250 mm.
In the technical scheme, the distance between the surfaces, close to each other, of the roller of the first guide part and the roller of the second guide part can be adjusted within 200-250 mm, and the intermediate blanks with the widths smaller than the distance are all suitable for the intermediate blank descaling system.
In a possible embodiment, a side of the first guide facing the second guide has a first guide surface that is tangential to an outer circumferential surface of the roller of the first guide; one surface of the second guide part facing the first guide part is provided with a second guide surface which is tangent with the peripheral surface of the roller of the second guide part.
In the technical scheme, the first guide surface is tangent to the outer peripheral surface of the roller of the first guide part, so that the intermediate blank can be directly guided to the outer peripheral surface of the roller of the first guide part after being contacted with the first guide surface; the second guide surface is tangent to the outer peripheral surface of the roller of the second guide part, the intermediate blank can be directly guided to the outer peripheral surface of the roller of the second guide part after being contacted with the second guide surface, and after the intermediate blank is centered, the guide centering device is in rolling contact with the intermediate blank, so that the damage to the outer peripheral surface of the intermediate blank is small.
In a possible embodiment, the distance between the two guiding and centering devices is 5-7 m.
In the technical scheme, the distance between the two guide centering devices is set to be 5-7 m, and the guide centering device can be suitable for guiding the middle blank with the length being larger than 8 m.
In a second aspect, an embodiment of the present application provides a steel rolling system, which includes a cogging mill, a secondary descaling ring, a finishing mill group, and the intermediate billet descaling system of the embodiment of the present application, where the descaling mill, the cogging mill, the secondary descaling ring, and the finishing mill group are sequentially arranged along a conveying direction of an intermediate billet.
According to the technical scheme, the secondary descaling rings are arranged behind the descaling machine and in front of the finishing mill unit, the intermediate billet is descaled by the descaling machine and then is subjected to rough rolling by the cogging mill to form the intermediate bar with smaller specification, the intermediate bar is subjected to secondary descaling under the action of high-pressure water of the secondary descaling rings before entering the finishing mill unit, the descaling effect is better, and the influence of iron scales on the surface quality of the finished bar is reduced.
In a third aspect, an embodiment of the present application further provides an intermediate billet descaling process, which is performed by using the intermediate billet descaling system of the embodiment of the present application, and includes: the method comprises the steps that an intermediate billet is conveyed through a conveying roller device, two ends of the intermediate billet are guided through two guide centering devices to center the intermediate billet, the intermediate billet is conveyed to a descaler to be descaled, the high-pressure water pressure of the descaler is larger than or equal to 21.5Mpa, the distance between the two guide centering devices is L1, the length of the intermediate billet is L2, and L2 is (1.4-2) L1.
In the technical scheme, when the intermediate billet descaling system is used for descaling, the length of the intermediate billet is L2, the relation between L2 and the distance L1 between the two guide centering devices is L2 (1.4-2) L1, one guide centering device is arranged at each of the first end and the second end of the conveying roller device, the two guide centering devices can respectively guide the two ends of the intermediate billet on the conveying roller device, the intermediate billet is centered under the guide effect of the two guide centering devices, one end of the intermediate billet is separated from one guide centering device far away from the descaling machine when the intermediate billet is continuously conveyed forwards by the conveying roller device, at the moment, because the two sides of the intermediate billet are restrained, the swing is not easy to generate, the conveying at the centered position is favorably kept, after the intermediate billet enters the descaling machine, the distances between the intermediate billet and the descaling ring in the opposite two directions are the same, and the intermediate billet is descaled under the action of high-pressure water of the descaling ring, the high-pressure water pressure of the descaling machine is more than or equal to 21.5Mpa, the descaling effect is good, the water pressure of the descaling ring in two opposite directions to the intermediate billet is basically the same, and the descaling effect is good.
In a possible embodiment, a secondary descaling ring is arranged behind the descaling machine along the conveying direction of the intermediate billet, the secondary descaling ring is used for descaling the intermediate bar material formed after the descaling of the descaling machine and the rough rolling, and the water pressure of the secondary descaling ring is more than or equal to 3 MPa.
According to the technical scheme, the secondary descaling ring is arranged behind the descaling machine, the intermediate billet is descaled by the descaling machine and then is subjected to rough rolling to form an intermediate bar with a smaller specification, the intermediate bar after rough rolling needs finish rolling, the intermediate bar after rough rolling is subjected to secondary descaling under the action of high-pressure water of the secondary descaling ring, and the scale on the surface of the intermediate bar after rough rolling can be well removed by the aid of the water pressure of the secondary descaling ring being not less than 3Mpa, so that the influence of the scale on the surface quality of a finished bar is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic structural diagram of an intermediate billet descaling system provided by an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a descaler provided in an embodiment of the present application;
FIG. 3 is a schematic structural diagram of a phosphorous removing ring provided in an embodiment of the present application;
FIG. 4 is a schematic structural diagram of a guiding and centering device according to an embodiment of the present disclosure;
FIG. 5 is a prior art intermediate billet descaled by the intermediate billet descaler method;
FIG. 6 illustrates an intermediate billet after being descaled by the intermediate billet descaling system according to the embodiment of the present application;
FIG. 7 is a flaw detection test result of a finished product obtained after descaling by the intermediate billet descaling system according to the example of the present application.
Icon: 10-an intermediate billet descaling system; 11-a descaler; 111-descaling ring; 112-a guide plate; 12-a transfer roller arrangement; 121-a first end; 122-a second end; 13-a guide centering device; 13 a-a roller; 131-a first guide; 1311-a first guide surface; 132-a second guide; 1321-a second guide surface; 133-a support seat; 133 a-locating holes; 1331-a first support part; 1332-a second support; 134-a first locator; 135-second positioning element.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Referring to fig. 1, fig. 1 shows a schematic structural diagram of an intermediate billet descaling system 10, where the intermediate billet descaling system 10 includes a descaler 11, a conveyor roller device 12, and two guide centering devices 13.
The descaler 11 is provided with a descaling ring 111 (see fig. 2 and 3), and the high-pressure water of the descaling ring 111 is used for descaling the intermediate billet; the transfer roller device 12 is used to transfer the intermediate blank to the descaler 11. The roller table centre line of the conveyor roller device 12 is arranged in line with the centre line of the descaling ring 111, and the two guide centring devices 13 are configured to guide and centre the intermediate blanks. It should be noted that, in the present embodiment, centering the intermediate blank means maintaining the intermediate blank on the roller table center line of the conveying roller device 12. The central line of the roller way held by the conveying roller device 12 may be strictly the central line of the roller way, or may have an error within an allowable range, for example, an error of 0.1 to 2 mm.
With continued reference to fig. 1, the two guiding and centering devices 13 are respectively disposed at the first end 121 and the second end 122 of the conveying roller device 12, and the direction from the first end 121 to the second end 122 is the conveying direction of the conveying roller device 12 (refer to the direction indicated by the arrow a in fig. 1), so that the two guiding and centering devices 13 can respectively guide the two ends of the intermediate blank at the same time, and convey the intermediate blank into the descaler 11 through the conveying roller device 12.
A guide and centering device 13 is provided at both the first end 121 and the second end 122 of the transfer roller device 12, at a certain time, the two guiding and centering devices 13 can respectively guide the two ends of the intermediate blank on the conveying roller device 12, the intermediate blank is centered under the guiding action of the two guide centering devices 13, and as the intermediate blank continues to be conveyed forward by the conveyor roller device 12, one end of the intermediate blank leaves one of the guide centering devices remote from the descaler 11, at which time, because the two sides of the intermediate billet are restrained, the intermediate billet is not easy to swing, is beneficial to keeping the middle position for conveying, enters the descaler 11, the intermediate billet is spaced at the same distance in two opposite directions as the descaling rings 111 in the descaler 11, the intermediate blank is descaled under the action of high-pressure water of the descaling ring 111, the water pressure of the descaling ring 111 in two opposite directions of the intermediate blank is basically the same, and the descaling effect is good.
Illustratively, the distance between the two guiding and centering devices 13 is 5-7 m. This spacing can be adapted for intermediate blank guiding centering with a length of more than 8m, for example 8.5m, 8.8m, 9.5m or 10 m.
Further, referring to fig. 1 and 4, the guiding and centering device 13 includes a supporting seat 133, a first guiding portion 131 and a second guiding portion 132, the first guiding portion 131 and the second guiding portion 132 are connected to the supporting seat 133, the first guiding portion 131 and the second guiding portion 132 have a gap, and the first guiding portion 131 and the second guiding portion 132 are configured to act on two opposite sides of the intermediate blank respectively to center the intermediate blank.
The support seat 133 provides support for the first guide portion 131 and the second guide portion 132, the first guide portion 131 and the second guide portion 132 have a gap, and the intermediate blank can pass between the first guide portion 131 and the second guide portion 132, and acts on two opposite sides of the intermediate blank through the first guide portion 131 and the second guide portion 132, respectively, so that the intermediate blank is centered.
Illustratively, the supporting base 133 includes a first supporting portion 1331 and a second supporting portion 1332, the first supporting portion 1331 and the second supporting portion 1332 are both connected to the frame of the conveying roller device 12, the first guide portion 131 is connected to the first supporting portion 1331, and the second guide portion 132 is connected to the second supporting portion 1332. The first support portion 1331 and the second support portion 1332 may be integrally provided or may be separately provided.
In a possible embodiment, the ends of the first guide 131 and the second guide 132 that are close to each other are each equipped with a roller 13a, the axis of rotation of the roller 13a being perpendicular to the plane of the conveying direction of the conveying roller means 12, the rolling surface of the roller 13a being intended to be in rolling contact with the intermediate blanks. In actual use, the intermediate blank may be in contact with the rolling surface of the roller 13a, or the intermediate blank may be spaced slightly from the rolling surface of the roller 13a so as not to be in contact with the rolling surface under normal conditions.
Illustratively, as shown in fig. 1 and 4, the distance between the first guide 131 and the second guide 132 is gradually decreased in the conveying direction of the intermediate blank. The rollers 13a are installed at one ends of the first guide 131 and the second guide 132 close to the descaler 11, that is, the rollers 13a are installed at the right end of the first guide 131 and the right end of the second guide 132, as shown in fig. 4. Since the intermediate slab moves in the conveying direction, it first reaches the end of the first guide portion 131 and the second guide portion 132 away from the descaler 11, and the first guide portion 131 and the second guide portion 132 are farther apart at the end, the distance between the first guide portion 131 and the second guide portion 132 gradually decreases in the conveying direction until it is close to or equal to the width of the intermediate slab, so that the intermediate slab, which is shifted during the conveying process, can be gradually guided to the intermediate position for conveying. Alternatively, the distance between the first guide 131 and the second guide 132 may not be gradually decreased, for example, the distance between the first guide 131 and the second guide 132 may be equal in pitch and gradually decreased in pitch, and the equal pitch position is located before the gradually decreased pitch position in the conveying direction of the intermediate blank.
By providing the rollers 13a at both ends of the first guide portion 131 and the second guide portion 132 which are close to each other, when the intermediate slab passes through the gap between the roller 13a of the first guide portion 131 and the roller 13a of the second guide portion 132 and the intermediate slab is in contact with the roller 13a of the first guide portion 131 and/or the roller 13a of the second guide portion 132, the roller 13a is in rolling contact with the intermediate slab, and the quality damage to the surface of the intermediate slab can be reduced.
The surface of the first guide part 131 facing the second guide part 132 has a first guide surface 1311, and the surface of the second guide part 132 facing the first guide part 131 has a second guide surface 1321. The first guide surface 1311 is tangent to the outer peripheral surface of the roller 13a of the first guide 131, and the second guide surface 1321 is tangent to the outer peripheral surface of the roller 13a of the second guide 132. Since the first guide surface 1311 is tangent to the outer circumferential surface of the roller 13a of the first guide portion 131, the intermediate blank may be directly guided to the outer circumferential surface of the roller 13a of the first guide portion 131 after contacting the first guide surface 1311; the second guiding surface 1321 is tangent to the outer peripheral surface of the roller 13a of the second guiding portion 132, the intermediate blank can be directly guided to the outer peripheral surface of the roller 13a of the second guiding portion 132 after contacting the second guiding surface 1321, and after the intermediate blank is centered, the guiding and centering device 13 is in rolling contact with the intermediate blank, so that damage to the outer peripheral surface of the intermediate blank is small.
In order to adapt to the guiding and centering of the intermediate blanks with different widths, in a possible embodiment, the first guiding portion 131 and the second guiding portion 132 are rotatably connected with the supporting seat 133, the rotating axes of the first guiding portion 131 and the second guiding portion 132 are perpendicular to the conveying direction of the conveying roller device 12, and the first guiding portion 131 and the second guiding portion 132 can be fixed through the positioning assembly, so that the distance between the roller 13a of the first guiding portion 131 and the roller 13a of the second guiding portion 132 can be adjusted. Illustratively, the ends of the first guide portion 131 and the second guide portion 132 remote from the descaler 11 are rotatably coupled to the support base 133 by a rotating shaft. In other embodiments, the rotatable connection between the first guide portion 131 and the second guide portion 132 and the support seat 133 may be realized by other components, such as a hinge, a pin, etc.
Because the first guide part 131 and the second guide part 132 are rotatably connected with the supporting seat 133, one end of the first guide part 131 and one end of the second guide part 132 can rotate relative to the supporting seat 133, and the rotating axial lines of the first guide part 131 and the second guide part 132 are perpendicular to the plane where the conveying direction of the conveying roller device 12 is located, when the first guide part 131 and the second guide part 132 rotate to a certain position relative to the supporting seat 133, the first guide part 131 and the second guide part 132 are fixed through the positioning assembly, so that the distance between the roller 13a of the first guide part 131 and the roller 13a of the second guide part 132 can be adjusted, and the device can be suitable for intermediate blanks of different specifications, guide the intermediate blanks of different specifications and center the intermediate blanks.
In a possible embodiment, the distance between the surfaces of the rollers 13a of the first guide 131 and the rollers 13a of the second guide 132 that are close to each other can be adjusted within 200 to 250 mm. Intermediate billets having widths less than this spacing are suitable for use in the intermediate billet descaling system 10. For example, an intermediate blank having a width and thickness of 210mm, or an intermediate blank having a width and thickness of 160 mm.
Further, after the distance between the roller 13a of the first guide portion 131 and the roller 13a of the second guide portion 132 is adjusted, in order to better fix the first guide portion 131 and the second guide portion 132 to the supporting seat 133, exemplarily, the first guide portion 131 is provided with a first mounting hole, the second guide portion 132 is provided with a second mounting hole, the supporting seat 133 is provided with a plurality of positioning holes 133a, the positioning assembly includes a first positioning member 134 and a second positioning member 135, the first positioning member 134 can be inserted into one positioning hole 133a of the first mounting hole and the plurality of positioning holes 133a to fix the first guide portion 131, and the second positioning member 135 can be inserted into one positioning hole 133a of the second mounting hole and the plurality of positioning holes 133a to fix the second guide portion 132. Illustratively, the first positioning element 134 and the second positioning element 135 are rod-shaped, and the first positioning element 134 may be a pin, a screw, or the like. It is to be understood that the first and second positioning members 134 and 135 are not limited to the rod shape as long as the first and second positioning members 134 and 135 can be inserted into the first and second mounting holes and the positioning holes 133 a.
Because the first guide portion 131 is provided with the first mounting hole, the second guide portion 132 is provided with the second mounting hole, and the supporting seat 133 is provided with the plurality of positioning holes 133a, the first guide portion 131 can be fixed to the supporting seat 133 by sequentially penetrating the first positioning member 134 through the first mounting hole and one positioning hole 133a of the plurality of positioning holes 133a, and the second guide portion 132 can be fixed to the supporting seat 133 by sequentially penetrating the second positioning member 135 through the second mounting hole and one positioning hole 133a of the plurality of positioning holes 133 a. The first fixing portion and the second fixing portion can be fixed at different positions by the first mounting hole being engaged with different positioning holes 133a and the second mounting hole being engaged with different positioning holes 133 a.
Illustratively, the positioning assembly may further be configured such that the positioning assembly includes a first positioning mechanism and a second positioning mechanism, both the first positioning mechanism and the second positioning mechanism are telescopic mechanisms, each telescopic mechanism includes a telescopic rod and a driving member for driving the telescopic rod to extend or retract, the driving member is mounted on the supporting seat 133, and the telescopic rod is hinged to the first guiding portion 131 or the second guiding portion 132.
By driving the telescopic rod to extend or retract through the driving member, and the telescopic rod is hinged to the first guide portion 131 or the second guide portion 132, the first guide portion 131 and the second guide portion 132 can be positioned at different positions, so that the distance between the roller 13a of the first guide portion 131 and the roller 13a of the second guide portion 132 can be adjusted. Illustratively, the telescopic rod is hinged to a middle portion of the first guide portion 131 or the second guide portion 132, or the telescopic rod is hinged to a position of the first guide portion 131 or the second guide portion 132 near the roller 13 a. The drive member may be driven by a hydraulic or pneumatic cylinder.
In order to better ensure the centering of the intermediate blank, the descaler 11 is further provided with two guide plates 112 (see fig. 2), the two guide plates 112 are arranged in parallel and spaced apart, the two guide plates 112 are respectively located on two sides of the center line of the descaling ring 111, the length direction of the guide plates 112 is the same as the conveying direction of the intermediate blank, and the distance between the two guide plates 112 is larger than the width of the intermediate blank. After one end of the intermediate billet enters the descaler 11, the two guide plates 112 can also guide the intermediate billet, so that the intermediate billet can be better ensured to be centered.
The embodiment of the application further provides a steel rolling system, which comprises a cogging mill (not shown in the figure), a secondary descaling ring (not shown in the figure), a finishing mill group (not shown in the figure) and the intermediate billet descaling system 10 of the embodiment of the application, wherein the descaling mill 11, the cogging mill, the secondary descaling ring and the finishing mill group are sequentially arranged along the conveying direction of the intermediate billet.
The secondary descaling rings are arranged behind the descaling machine 11 and in front of the finishing mill unit, the intermediate billet is descaled by the descaling machine 11 and then is subjected to rough rolling by the cogging mill to form an intermediate bar with a smaller specification, and the intermediate bar is subjected to secondary descaling under the action of high-pressure water of the secondary descaling rings before entering the finishing mill unit, so that the descaling effect is better, and the influence of iron scales on the surface quality of the finished bar is reduced.
Illustratively, the secondary descaling rings are 250X 250mm in size. Wherein, the water supply of the secondary descaling ring is from a roller cooling system and is led to the secondary descaling ring through a pipeline, and the water pressure is more than or equal to 3MPa, such as 3-5 MPa.
The embodiment of the present application further provides an intermediate billet descaling process, which is performed by using the intermediate billet descaling system 10 of the embodiment of the present application, and includes: the intermediate billet is conveyed by the conveying roller device 12, two ends of the intermediate billet are guided by the two guide centering devices 13 and centered, the intermediate billet is conveyed to the descaler 11 for descaling, the high-pressure water pressure of the descaler 11 is more than or equal to 21.5Mpa, the distance between the two guide centering devices 13 is L1, the length of the intermediate billet is L2, and L2 is (1.4-2) L1.
When the intermediate billet descaling system 10 is used for descaling, the relationship between the length of the intermediate billet L2 and the distance between the two guide centering devices 13L 1 is L2 (1.4-2) L1, one guide centering device 13 is arranged at each of the first end 121 and the second end 122 of the conveying roller device 12, the two guide centering devices 13 can guide the two ends of the intermediate billet on the conveying roller device 12, the intermediate billet is centered under the guiding action of the two guide centering devices 13, one end of the intermediate billet is separated from one guide centering device far away from the descaling machine 11 when the intermediate billet is continuously conveyed forwards by the conveying roller device 12, at the moment, because the intermediate billet is not subjected to any other external force, only the conveying roller device 12 conveys the intermediate billet forwards, the intermediate billet keeps the intermediate billet in the centered position all the time, after the intermediate billet enters the descaling machine 11, the intermediate billet has the same distance with the descaling ring 111 in the descaling machine 11 in two opposite directions, the intermediate blank is descaled under the action of high-pressure water of the descaling ring 111, the high-pressure water pressure of the descaler 11 is more than or equal to 21.5Mpa, the descaling effect is good, the water pressures of the descaling ring 111 to the intermediate blank in two opposite directions are basically the same, and the descaling effect is good.
Illustratively, a secondary descaling ring is arranged behind the descaling machine 11 along the conveying direction of the intermediate billet, and is used for descaling the intermediate bar material formed after the descaling machine 11 is used for rough rolling, and the water pressure of the secondary descaling ring is more than or equal to 3 MPa.
And a secondary descaling ring is arranged behind the descaling machine 11, the intermediate billet is descaled by the descaling machine 11 and then is rough-rolled to form an intermediate bar with a smaller specification, the rough-rolled intermediate bar needs to be finish-rolled, the rough-rolled intermediate bar is subjected to secondary descaling under the action of high-pressure water of the secondary descaling ring, and the scale on the surface of the rough-rolled intermediate bar can be well removed by the aid of the water pressure of the secondary descaling ring being more than or equal to 3Mpa, so that the influence of the scale on the surface quality of the finished bar is reduced.
The working principle of the intermediate billet descaling system 10 in the embodiment of the application is as follows:
the intermediate billet is conveyed to the descaling machine 11 through the conveying roller device 12 for descaling, the length of the intermediate billet is larger than the distance between the two guide centering devices 13, one guide centering device 13 is arranged at the first end 121 and the second end 122 of the conveying roller device 12, two ends of the intermediate billet on the conveying roller device 12 can be guided by the two guide centering devices 13, the intermediate billet is centered under the guide effect of the two guide centering devices 13, when the intermediate billet is continuously conveyed forwards by the conveying roller device 12, one end of the intermediate billet is separated from one guide centering device far away from the descaling machine 11, at the moment, the intermediate billet is only conveyed forwards by the conveying roller device 12 due to no other external force, the intermediate billet keeps the centered position all the time, after entering the descaling machine 11, the relative two directions of the intermediate billet and the descaling ring 111 in the descaling machine 11 have the same distance, and the intermediate billet is descaled under the high-pressure water effect of the descaling ring 111, the descaling rings 111 have substantially the same water pressure in two opposite directions of the intermediate billet, and have good descaling effect (the descaling system 10 for the intermediate billet according to the embodiment of the present application has the dephosphorization effect as shown in fig. 6, where fig. 5 is the intermediate billet after being descaled by the intermediate billet descaling process in the prior art).
In addition, the intermediate blank after descaling in the embodiment of the application is rolled into round steel with a phi 97 specification through a large bar line, the surface of the round steel has no pitted surface, the initial inspection yield is improved to 99.12% from 44.76% through surface flaw detection inspection, and the surface quality of steel is greatly improved. Specifically, the results of detecting the flaw detection yield of the surface of the round steel are shown in fig. 7, and it should be noted that the first batch and the second batch are the surface flaw detection results of the intermediate billet which is descaled by the intermediate billet descaling process of the prior art and rolled into the round steel with the diameter of 97 by the large bar line, and the third batch to the sixteenth batch are the surface flaw detection results of the intermediate billet which is rolled into the round steel with the diameter of 97 by the large bar line according to the embodiment of the present application.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (12)
1. An intermediate billet descaling system, comprising:
the descaling machine is used for descaling the intermediate blank;
a transfer roller device for transferring the intermediate blank to the descaler; and
two guide centering devices configured to guide and center the intermediate blank, the two guide centering devices being respectively disposed at a first end and a second end of the transfer roller device, a direction from the first end to the second end being a transfer direction of the transfer roller device, so that the two guide centering devices can simultaneously and respectively guide both ends of the intermediate blank and transfer the intermediate blank to the descaler through the transfer roller device.
2. The system according to claim 1, wherein said guide centering device comprises a support seat, a first guide portion and a second guide portion, said first guide portion and said second guide portion are connected to said support seat and spaced apart from each other, said first guide portion and said second guide portion respectively act on opposite sides of said intermediate blank to center said intermediate blank.
3. The system for descaling intermediate blanks according to claim 2, wherein the first guide portion and the second guide portion are provided at ends close to each other with rollers, the rotating shafts of the rollers are perpendicular to the plane of the conveying direction of the conveying roller device, and the rolling surfaces of the rollers are used for rolling contact with the intermediate blanks.
4. The system for descaling intermediate blanks according to claim 3, wherein the first guide portion and the second guide portion are rotatably connected to the support base, the rotation axes of the first guide portion and the second guide portion are perpendicular to the plane of the conveying direction of the conveying roller device, and the first guide portion and the second guide portion can be fixed by a positioning assembly, so that the distance between the rollers of the first guide portion and the rollers of the second guide portion can be adjusted.
5. The system of claim 4, wherein the first guide portion defines a first mounting hole, the second guide portion defines a second mounting hole, the support base defines a plurality of positioning holes, the positioning assembly includes a first positioning member and a second positioning member, the first positioning member is configured to be inserted through the first mounting hole and one of the plurality of positioning holes to fix the first guide portion, and the second positioning member is configured to be inserted through the second mounting hole and one of the plurality of positioning holes to fix the second guide portion.
6. The intermediate billet descaling system according to claim 4, wherein the positioning assembly comprises a first positioning mechanism and a second positioning mechanism, the first positioning mechanism and the second positioning mechanism are telescopic mechanisms, each telescopic mechanism comprises a telescopic rod and a driving member for driving the telescopic rod to extend or retract, the driving member is mounted on the support seat, and the telescopic rod is hinged to the first guide portion or the second guide portion.
7. The intermediate blank descaling system according to claim 4, wherein the distance between the surfaces of the rollers of the first guide portion and the rollers of the second guide portion that are close to each other is adjustable within 200-250 mm.
8. The intermediate blank descaling system according to any one of claims 3 to 7, wherein a surface of the first guide portion facing the second guide portion has a first guide surface that is tangential to an outer peripheral surface of the roller of the first guide portion; one surface of the second guide part facing the first guide part is provided with a second guide surface which is tangent with the peripheral surface of the roller of the second guide part.
9. Intermediate blank descaling system according to any one of claims 1 to 7, wherein the distance between the two guide centering devices is 5 to 7 m.
10. A steel rolling system comprising an cogging mill, a secondary descaling ring, a finishing mill group, and the intermediate slab descaling system according to any one of claims 1 to 9, wherein the descaling mill, the cogging mill, the secondary descaling ring, and the finishing mill group are arranged in this order along a conveying direction of the intermediate slab.
11. An intermediate billet descaling process, which is mainly used for descaling by the intermediate billet descaling system according to any one of claims 1 to 9, and comprises the following steps: the intermediate billet is conveyed through the conveying roller device, two ends of the intermediate billet are guided through the two guide centering devices and centered, the intermediate billet is conveyed to the descaler for descaling, the high-pressure water pressure of the descaler is larger than or equal to 21.5Mpa, the distance between the two guide centering devices is L1, the length of the intermediate billet is L2, and the L2 is (1.4-2) L1.
12. The intermediate billet descaling process according to claim 11, wherein a secondary descaling ring is arranged after the descaling machine along the conveying direction of the intermediate billet, the secondary descaling ring is used for descaling an intermediate bar material which is formed after the descaling machine is used for descaling and then rough rolling, and the water pressure of the secondary descaling ring is more than or equal to 3 Mpa.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113305160A (en) * | 2021-04-29 | 2021-08-27 | 首钢京唐钢铁联合有限责任公司 | Descaling machine pinch roll control method and device and strip steel descaling system |
| CN113510154A (en) * | 2021-05-07 | 2021-10-19 | 中冶东方工程技术有限公司 | Online cold descaling process production line |
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| CN113510154A (en) * | 2021-05-07 | 2021-10-19 | 中冶东方工程技术有限公司 | Online cold descaling process production line |
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| CN110871218B (en) | 2021-07-20 |
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Address after: 512000 special bar plant, MABA Town, Qujiang District, Shaoguan City, Guangdong Province Patentee after: Baowu jiefuyi Special Steel Co.,Ltd. Address before: 512000 special bar plant, MABA Town, Qujiang District, Shaoguan City, Guangdong Province Patentee before: BAOSTEEL SPECIAL STEEL SHAOGUAN Co.,Ltd. |