WO2014084373A1 - 熱延通板ガイド - Google Patents
熱延通板ガイド Download PDFInfo
- Publication number
- WO2014084373A1 WO2014084373A1 PCT/JP2013/082250 JP2013082250W WO2014084373A1 WO 2014084373 A1 WO2014084373 A1 WO 2014084373A1 JP 2013082250 W JP2013082250 W JP 2013082250W WO 2014084373 A1 WO2014084373 A1 WO 2014084373A1
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- WIPO (PCT)
- Prior art keywords
- hot
- rolled
- plate guide
- rolled steel
- plate
- Prior art date
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Classifications
-
- 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
- B21B45/02—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 lubricating, cooling, or cleaning
- B21B45/0203—Cooling
- B21B45/0209—Cooling devices, e.g. using gaseous coolants
- B21B45/0215—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes
- B21B45/0218—Cooling devices, e.g. using gaseous coolants using liquid coolants, e.g. for sections, for tubes for strips, sheets, or plates
-
- 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
- B21B39/008—Rollers for roller conveyors
Definitions
- the present invention relates to a hot-rolled sheet guide disposed between table rolls that convey hot-rolled steel sheets in a hot rolling line.
- a slab is heated to a predetermined temperature in a heating furnace, the heated slab is rolled to a predetermined thickness with a roughing mill to form a rough rolled material, and the rough rolled material is finished with a plurality of rolling stands.
- a hot-rolled steel sheet having a predetermined thickness is produced by rolling with a rolling mill.
- the hot-rolled steel plate rolled with the finishing mill is cooled to predetermined temperature in the cooling floor provided with the table roll, Then, it is wound up in coil shape with a winder.
- an upper surface cooling device having a nozzle is disposed above the hot-rolled steel sheet to be transported, and a lower surface cooling device having a cooling nozzle is disposed between the table rolls that transport the hot-rolled steel sheet. It is set as the structure which cools the upper and lower surfaces of the hot-rolled steel plate which passes.
- the hot-rolled plate guide disposed between the table rolls is provided with a nozzle hole at a position corresponding to the above-described cooling nozzle in order to cool the lower surface of the hot-rolled steel plate.
- the cooling water sprayed from the cooling nozzle stays on the hot-rolling plate guide after colliding with the lower surface of the hot-rolling steel plate. For this reason, the cooling of the portion where the hot-rolling plate guide is disposed is promoted, the cooling unevenness of the lower surface is generated, and there is a possibility that the quality characteristics thereafter may be problematic.
- drain holes are formed in addition to the nozzle holes, and the cooling water staying on the hot-rolled plate guides is passed through the drain holes. It is comprised so that it may discharge through.
- the nozzle which injects a cooling water with respect to some through-holes among the through-holes formed in the grid of the hot-rolled plate guide by several in the grid is arrange
- a large amount of high-pressure water is used as cooling water.
- the cooling water is injected with high pressure with respect to the steel plate surface in the state with which the space between the hot-rolled steel plate and the hot-rolling plate guide is substantially filled with the cooling water. Therefore, even in Patent Document 2, the drainage property of the hot-rolled plate guide is not sufficient.
- the problem of uneven cooling temperature of the hot-rolled steel sheet due to the staying water on the hot-rolled sheet guide exists in the longitudinal direction in addition to the width direction of the hot-rolled steel sheet.
- the thickness variation may occur in the longitudinal direction on one end side of the hot-rolled steel sheet. As a result of investigating the cycle of this thickness variation, it was found that it was in good agreement with the temperature variation of the hot rolled steel sheet before the winder of the hot rolling line.
- the hot-rolled steel sheet rolled by the finish rolling mill is wound up by the winder, the hot-rolled steel sheet is transported because no tension acts on it.
- the hot rolled steel sheet may meander up and down.
- the hot-rolled steel sheet meandering up and down greatly decreases the temperature when the part that protrudes downward approaches and contacts the hot-rolled sheet guide, so as described above, before the winder of the hot rolling line It was found that the temperature of the hot-rolled steel sheet changed periodically in the longitudinal direction.
- the portion where the hot-rolled steel plate is convex downward is close to and in contact with the hot-rolled plate guide, so if the cooling water has accumulated on the hot-rolled plate guide, Is locally cooled and the temperature is greatly reduced. For this reason, simply providing the drain hole does not sufficiently discharge the cooling water staying on the hot-rolled plate guide, and the temperature fluctuation in the longitudinal direction of the hot-rolled steel plate cannot be suppressed. That is, in order to suppress the temperature fluctuation in the longitudinal direction of the hot-rolled steel sheet, it is necessary to further improve the drainability of the hot-rolled sheet guide.
- the hot-rolled sheet guide is worn by coming into contact with the hot-rolled steel sheet.
- the hot-rolled plate guide is made of a material softer than the hot-rolled steel plate so that no flaws are generated in the hot-rolled steel plate, there is a problem that the life is shortened due to early wear.
- the plate passing speed has been increased, and the early wear of the hot-rolled plate guide tends to be promoted.
- the hot-rolling plate guide is replaced, the operation is interrupted, so that the life-extension of the hot-rolling plate guide is required from the viewpoint of improving production efficiency.
- An object of the present invention is to provide a hot-rolled plate guide capable of suppressing temperature fluctuations in the longitudinal direction of a steel sheet and capable of suppressing the early wear and extending the life.
- a transparent acrylic plate is regarded as a hot-rolled steel plate
- a hot-rolled plate guide is disposed on the lower surface of the acrylic plate
- the nozzle disposed in the nozzle hole of the hot-rolled plate guide is directed to the lower surface of the acrylic plate.
- the cooling water sprayed from the nozzle 27 collides with the lower surface of the acrylic plate, and flows concentrically on the lower surface of the acrylic plate when viewed from the upper surface.
- the speed of the cooling water is high and the colliding object is a liquid, most of the water colliding with the acrylic plate flows along the lower surface of the acrylic plate without immediately bouncing off and falling.
- the water that has flowed into the portion with a short distance from the lower surface collision portion of the acrylic plate is supplied from other nozzles directly above the drainage hole 3b. It collides with water and falls through the drain hole 3b (S1).
- the hot-rolled plate guide according to the present invention is a hot-rolled plate guide disposed between table rolls that convey hot-rolled steel plates in a hot rolling line. And formed between a plurality of nozzle holes provided at positions corresponding to cooling nozzles disposed between the table rolls and the nozzle holes adjacent to each other in the plate width direction of the hot-rolled steel sheet to be conveyed. Drainage holes, wherein the drainage holes extend in the plate-passing direction of the hot-rolled steel plate to be conveyed, and the first hole portion in the plate-passing direction. It is characterized by comprising second holes formed at both ends and expanded in the plate width direction.
- a plurality of nozzle holes are provided at positions corresponding to the cooling nozzles disposed between the table rolls.
- the cooling water sprayed toward the lower surface of the hot-rolled steel sheet through the nozzle holes collides with the lower surface of the hot-rolled steel sheet and spreads radially, and the cooling water sprayed from the nozzle holes adjacent to each other in the width direction. Will collide.
- the cooling water sprayed from the adjacent nozzle holes A drainage hole will be arrange
- the drain hole extends in the direction of the hot-rolled steel plate being conveyed.
- the opening area of the drain hole can be secured, and the cooling water discharge can be further promoted.
- a second hole portion that is enlarged in the plate width direction is provided at an end portion of the front drainage hole in the plate direction.
- the cooling water sprayed toward the lower surface of the hot-rolled steel sheet through the nozzle holes collides with the lower surface of the hot-rolled steel sheet, spreads radially, and flows in the sheet passing direction. For this reason, it becomes possible to accelerate
- the drain hole is preferably formed so that the width W1 of the first hole and the width W2 of the second hole satisfy the following formula (1): 1.00 ⁇ W1 / W2 ⁇ 1.70 (1)
- the hot-rolled plate guide may be formed of a resin that is a softer material than the hot-rolled steel plate.
- the Vickers hardness of the material forming the hot-rolled plate guide is preferably 36 or more and less than 125.
- the opening area ratio Sh which is the ratio of the opening area of the nozzle hole and the drain hole to the area of the entire upper surface of the hot-rolled plate guide is 0.13 or more. Therefore, the cooling water existing between the hot-rolled plate guide and the lower surface of the hot-rolled steel plate can be surely discharged from the drain hole, and the cooling water stays on the hot-rolled plate guide. Can be suppressed. Therefore, even when the hot-rolled steel plate is greatly meandering up and down and protrudes downward, the hot-rolled steel plate is prevented from greatly decreasing in temperature even when the hot-rolled steel plate is close to or in contact with the hot-rolled plate guide. Thus, temperature fluctuations in the longitudinal direction of the hot-rolled steel sheet can be suppressed. In the present invention, since the opening area ratio Sh is 0.18 or less, a contact area with the hot-rolled steel sheet is ensured, early wear of the hot-rolled sheet guide can be suppressed, and the life can be extended. Can be planned.
- the hot-rolling plate guide of the present invention is arranged at the center of the roll width of the table roll, and the width of the hot-rolling plate guide is configured to be 1 ⁇ 2 or less of the roll width of the table roll. You may do it. Thereby, it is possible to easily discharge the cooling water.
- the temperature fluctuation in the longitudinal direction of the hot-rolled steel sheet can be suppressed by efficiently discharging the cooling water sprayed toward the lower surface of the hot-rolled steel sheet from above the hot-rolled sheet guide, and It is possible to provide a hot-rolled plate guide capable of suppressing the early wear and extending the life.
- Hot-rolled plate guide 30 according to an embodiment of the present invention will be described with reference to FIGS.
- the hot-rolled sheet guide 30 according to the present embodiment is used in, for example, the hot rolling line 10 shown in FIG.
- a hot rolling line 10 shown in FIG. 1 includes a heating furnace 11 that heats the slab 1, a rough rolling machine 12 that roughly heats the heated slab 1 to form a rough rolled material 5a, and reheats the rough rolled material 5a. And an induction heating device 13. Further, the hot rolling line 10 includes a finishing mill 15 that rolls the rough rolled material 5a to produce a hot-rolled steel sheet having a predetermined thickness, and a cooling bed 20 that cools the hot-rolled steel sheet 5 after the finish rolling to a predetermined temperature. And a coiler 18 that winds up the cooled hot-rolled steel sheet 5.
- the cooling floor 20 includes a plurality of table rolls 21, 21 arranged at intervals toward the sheet passing direction F of the hot rolled steel sheet 5, and the hot rolled steel sheet to be conveyed. 5 is provided with an upper surface cooling device 22 that cools the upper surface of 5 and a lower surface cooling device 25 that is disposed between the table rolls 21 and 21 and cools the lower surface of the hot-rolled steel sheet 5 being conveyed. And in the plate passing direction F, between the table rolls 21 and 21, the hot rolled plate guide 30 which is this embodiment is arrange
- the upper surface cooling device 22 includes a water supply pipe 23 to which cooling water is supplied, and a laminar nozzle 24 that is connected to the water supply pipe 23 and supplies the cooling water toward the upper surface of the hot-rolled steel sheet 5 to be conveyed. .
- the lower surface cooling device 25 includes a water supply pipe 26 to which cooling water is supplied, and a plurality of cooling nozzles 27 arranged in the water supply pipe 26. As shown in FIG. 3, the water supply pipe 26 of the lower surface cooling device 25 is disposed so as to extend in the plate width direction of the hot-rolled steel plate 5 to be conveyed. Are arranged in parallel in the plate width direction.
- the hot-rolling plate guide 30 is a table roll 21 adjacent to the plate-passing direction F in order to prevent the tip of the hot-rolled steel plate 5 rolled by the finish rolling mill 15 from falling between the table rolls 21, 21. 21.
- the hot-rolled plate guide 30 is made of a softer material than the hot-rolled steel plate 5, and is specifically made of resin.
- the hot-rolled sheet guide 30 is made of a softer material than the hot-rolled steel sheet 5 in order to prevent the hot-rolled steel sheet 5 from having wrinkles that affect quality such as scratches.
- the hardness of ordinary steel is about 125 Hv.
- the hardness of the hot-rolled sheet guide 30 is preferably 125 Hv or less.
- the hot-rolled plate guide 30 desirably has a hardness of 36 Hv or more.
- the hot-rolling plate guide 30 is arranged so that the upper surface thereof is in a position retracted one step below the upper end position of the table roll 21. Further, as shown in FIG. 3, the hot-rolled plate guide 30 is arranged at the center of the roll width of the table roll 21, and can handle hot-rolled steel plates 5 having different plate widths.
- the width of the hot-rolled plate guide 30 is preferably configured to be 1 ⁇ 2 or less of the roll width of the table roll 21.
- the hot-rolling plate guide 30 is provided with a nozzle hole 31 at a position corresponding to the cooling nozzle 27 of the lower surface cooling device 25.
- the hot-rolled plate guide 30 according to the present embodiment, as shown in FIG. 4, three nozzle holes 31 are arranged in parallel in the plate width direction of the hot-rolled steel plate 5 to be conveyed. Further, drain holes 32 are provided between the nozzle holes 31 adjacent to each other in the plate width direction. In this embodiment, as shown in FIGS. 3 and 4, the drain hole 32 extends in the sheet passing direction F of the hot-rolled steel sheet 5 being conveyed.
- the drainage holes 32 are located between the nozzle holes 31 adjacent to each other in the plate width direction, and extend portions 34 that are first holes extending in the plate passing direction F of the hot-rolled steel plate 5, and the drainage holes 32.
- a wide hole portion 33 is formed at both ends of the extending portion 34 in the sheet passing direction F and is a second hole portion having an opening area enlarged in the plate width direction.
- an opening area ratio that is an opening area of the nozzle hole 31 and the drainage hole 32 with respect to the entire area of the upper surface of the hot-rolling plate guide 30 when viewed from above in the vertical direction.
- Sh is set to be within a range of 0.13 or more and 0.18 or less. A detailed description of the shape of the drain hole 32 and the opening area ratio Sh will be described later.
- the rough rolled material 5a is charged into the induction heating device 13 and reheated. (Reheating process). Then, the rough rolled material 5 a that has passed through the induction heating device 13 is supplied to the finishing mill 15.
- the finish rolling machine 15 performs finish rolling to produce a hot-rolled steel sheet 5 having a predetermined thickness (finish rolling process).
- the hot-rolled steel sheet 5 rolled by the finish rolling mill 15 is conveyed toward the sheet passing direction F by the table roll 21 in the cooling floor 20 and cooled to a predetermined temperature by the upper surface cooling device 22 and the lower surface cooling device 25. Then, the hot-rolled steel sheet 5 cooled to a predetermined temperature is wound around the coiler 18 (winding step).
- Hot rolled plate guide 30 extends the wide hole portion 33 of the drainage hole 32 in the plate width direction from the extending portion 34 in order to achieve both improvement in drainage performance and strength improvement of the cooling water. , More collision flows are discharged from the drain holes 32.
- FIG. 5 is a view as seen from the front side in the sheet passing direction F of the hot-rolled steel sheet 5 along the II cutting line of FIG.
- the cooling water W is jetted toward the lower surface of the hot-rolled steel plate 5 from the cooling nozzle 27 inserted into the nozzle hole 31 of the hot-rolled plate guide 30.
- the cooling water W that has collided with the lower surface of the hot-rolled steel plate 5 spreads radially in the space between the upper surface of the hot-rolled plate guide 30 and the lower surface of the hot-rolled steel plate 5.
- the hot-rolled plate guide 30 includes the plurality of nozzle holes 31 provided at positions corresponding to the cooling nozzles 27 disposed between the table rolls 21 and 21, and the plate width direction. And drain holes 32 formed between the nozzle holes 31 adjacent to each other. The drain holes 32 are arranged in a region where the cooling waters W injected from the cooling nozzles 27 collide with each other through the nozzle holes 31 and 31 adjacent in the plate width direction. Thereby, drainage of the cooling water W is promoted.
- the drainage holes 32 are located between the nozzle holes 31 adjacent to each other in the plate width direction and extend in the plate passing direction F of the hot-rolled steel plate 5. And wide hole portions 33 formed at both ends of the extending portion 34 and having an opening area enlarged in the plate width direction.
- the cooling water W ejected from each cooling nozzle 27, 27 spreads radially between the adjacent nozzle holes 31, 31. Collides linearly along the plate direction F. In the space where the cooling water W collides linearly, an extending portion 34 of the drain hole 32 is disposed.
- cooling water W flows downstream in the plate passing direction F along with the plate passing of the hot-rolled steel plate 5.
- a wide hole 33 is formed on the downstream side in the sheet passing direction F through which the cooling water W accompanying the sheet passing of the hot-rolled steel sheet 5 flows.
- the cooling water W that has collided on the extending portion 34 is quickly discharged to the lower side of the hot-rolling plate guide 30 through the drain hole 32. Further, a collision flow caused by a part of the cooling water that is not discharged by the extending portion 34 flows in the plate passing direction F so as to escape from the extending portion 34, but these are efficiently discharged by the wide hole portion 33. That is, the hot-rolling plate guide 30 is configured so that the cooling water W does not stay on the upper surface thereof.
- the drain hole 32 is also formed with a wide hole 33 on the upstream side in the sheet passing direction F.
- the wide hole portion 33 also on the upstream side in the sheet passing direction F is accompanied by the rotation of the table roll 21 located on the upstream side in the sheet passing direction F among the table rolls 21 and 21 on which the hot-rolled plate guide 30 is arranged. It is useful for discharging the flowing cooling water W.
- the drainage hole 32 is preferably formed so that the width W1 of the wide hole portion 33 and the width W2 of the extending portion 34 in the plate width direction satisfy the relationship of the following formula (1).
- the widths W1 and W2 are the maximum widths of the wide hole portion 33 and the extending portion 34 in the plate width direction.
- the width W1 of the wide hole portion 33 formed at both ends of the extending portion 34 is made larger than the width W2 of the extending portion 34.
- the cooling water which was not discharged by the extension part 34 can be discharged
- the width W1 of the wide hole portion 33 is excessively increased, the strength of the portion of the hot-rolled plate guide 30 where the wide hole portion 33 is formed is lowered. Accordingly, the width W1 of the wide hole portion 33 is preferably set to a size up to 1.70 times the width W2 of the extending portion 34.
- the length L of the drainage hole 32 in the plate passing direction F is preferably as large as possible. However, depending on the durability of the hot-rolled plate guide 30 and the positional relationship with the table rolls 21, 21, the passage of the hot-rolled plate guide 30 can be improved. In some cases, the vicinity of the end in the plate direction cannot be opened. The length L of the drain hole 32 is appropriately determined in consideration of these.
- Such a hot-rolling plate guide 30 has an opening area ratio that is an opening area of the nozzle hole 31 and the drainage hole 32 with respect to the entire area of the upper surface of the hot-rolling plate guide 30 when viewed from above in the vertical direction. It is formed so that Sh is 0.13 or more. Thereby, the opening area which can discharge
- the hot-rolling plate guide 30 has an opening area ratio Sh which is an opening area of the nozzle hole 31 and the drainage hole 32 with respect to the entire area of the upper surface of the hot-rolling plate guide 30 when viewed from above in the vertical direction. It is configured to be 0.18 or less. In order to increase the discharge efficiency of the cooling water W, it is preferable to increase the opening area of the hot-rolling plate guide 30, but if the opening area is too large, the durability of the hot-rolling plate guide 30 is affected. Therefore, by setting the opening area ratio Sh to 0.18 or less, a contact area between the hot-rolled plate guide 30 and the hot-rolled steel plate 5 in proximity to and in contact with the hot-rolled plate guide 30 is ensured. Thereby, it is possible to prevent the hot-rolling plate guide 30 from being worn out at an early stage and to extend the life.
- Sh is an opening area of the nozzle hole 31 and the drainage hole 32 with respect to the entire area of the upper surface of the hot-rolling plate guide 30 when viewed from above in the vertical direction.
- the drainage holes 32 are formed on the extending portions 34 extending in the plate-passing direction F and on both ends of the extending portion 34 in the plate-passing direction F. It consists of the wide hole part 33 expanded in the width direction. Therefore, the cooling water W injected through the nozzle holes 31 and 31 adjacent to each other in the plate width direction is injected through the adjacent nozzle holes 31 and 31 from the extending portion 34 formed in the region where the cooling waters W collide with each other. Further, the opening area of the drain hole 32 from which the collision flow of the cooling water W is discharged can be secured, and the drainage of the cooling water W can be further promoted.
- the hot-rolled plate guide 30 is made of a resin that is a softer material than the hot-rolled steel plate 5, the hot-rolled steel plate 5 and the hot-rolled plate guide 30 are in contact with each other. Even so, generation of wrinkles in the hot-rolled steel sheet 5 can be suppressed. Even when the hot-rolling plate guide 30 is made of a soft material, as described above, the opening area ratio Sh is set to 0.18 or less, so that the hot-rolling plate guide 30 is worn early. Can be suppressed. Further, the hot-rolling plate guide 30 is arranged at the center of the roll width of the table roll 21, and the width of the hot-rolling plate guide 30 is configured to be 1 ⁇ 2 or less of the roll width of the table roll 21. Thus, the cooling water W sprayed toward the lower surface of the hot-rolled steel sheet 5 can be easily discharged by reducing the installation area of the hot-rolled steel sheet guide 30 itself.
- the cooling water sprayed toward the lower surface of the hot-rolled steel plate 5 is efficiently discharged from the hot-rolled plate guide 30 to suppress temperature fluctuations in the longitudinal direction of the hot-rolled steel plate 5. In addition, early wear can be suppressed.
- the hot-rolled plate guide which is this embodiment was demonstrated, this invention is not limited to this, It can change suitably in the range which does not deviate from the technical idea of the invention.
- the number and shape of the nozzle holes and the number and shape of the discharge holes are not limited to those illustrated in the embodiment, and may be appropriately changed in design. Furthermore, although demonstrated as what was comprised with resin, it is not limited to this, What was comprised with the other material may be sufficient.
- the shape of the drain hole may be different between the upstream side and the downstream side in the plate passing direction as in the hot-rolled plate guide 30A shown in FIG.
- the hot-rolled plate guide 30A in FIG. 6 differs from the hot-rolled plate guide 30 in FIG. 4 in the shape of the drain holes 32A.
- the drainage hole 32A in FIG. 6 is formed between the wide hole portion 33a on the upstream side in the plate passing direction and the wide hole portion 33b on the downstream side in the plate passing direction, and the nozzle hole 31A, and extends between the wide hole portions 33a and 33b. It consists of the existing part 34.
- the drainage hole 32 is preferably formed so that the width W1 of the wide hole portions 33a and 33b and the width W2 of the extending portion 34 in the plate width direction satisfy the relationship of the above formula (1). .
- the collision flow caused by a part of the cooling water that is not discharged at the extending portion 34 flows more in the downstream side in the sheet passing direction with the passing plate of the hot rolled steel sheet than in the upstream side in the sheet passing direction.
- the cooling water can be discharged more efficiently by making the wide hole portion 33b on the downstream side in the passage direction longer than the wide hole portion 33a on the upstream side in the passage direction in the passage direction. Can do.
- Example 1 the temperature fluctuation in the longitudinal direction of the hot-rolled steel sheet was confirmed.
- a hot-rolling plate guide 30 is used in which drain holes 32 extending in the plate-passing direction are formed between nozzle holes 27 adjacent in the plate-width direction. It was. Further, as a comparative example, the hot-rolled plate guide (Comparative Example 1) not provided with the drain hole of FIG. 4 was used.
- the above-mentioned hot-rolled plate guide was disposed between the table rolls of the cooling bed, the hot-rolled steel plate was cooled, and the temperature variation in the region of 50 m from the tip of the hot-rolled steel plate that passed through the cooling bed was measured.
- the temperature fluctuation range E due to the influence of the hot-rolled plate guide was 10.3 ° C.
- the temperature fluctuation range E due to the influence of the hot-rolled plate guide was 5.8 ° C. It was confirmed that the temperature fluctuation in the longitudinal direction of the hot-rolled steel sheet can be suppressed by using the hot-rolled sheet guide of the present invention example.
- Example 2 the drainage performance of the hot-rolled plate guide was verified when the width ratio (W1 / W2) between the wide hole portion and the extension portion of the drainage hole and the opening area ratio Sh were changed.
- a hot-rolling plate guide 30 is used in which drain holes 32 extending in the plate-passing direction are formed between nozzle holes 27 adjacent in the plate-width direction. It was. Further, as a comparative example, a hot-rolled plate guide 30A having drain holes without wide holes as shown in FIG. 7 was used.
- Example 2 the drainage performance and durability of the hot-rolled plate guides of Examples and Comparative Examples were confirmed using a testing machine that simulated the hot rolling line 10 as shown in FIG.
- the results are shown in Table 1 below.
- the drainage was evaluated by measuring the amount of cooling water discharged per unit time.
- the drainage evaluation was performed based on Table 2 below.
- the water density of the cooling nozzle 27 was 0.52 m 3 / m 2 ⁇ min.
- the durability was evaluated by measuring the amount of consumption of the hot-rolled plate guide per month. Durability evaluation was performed based on Table 3 below.
- the opening area ratio Sh is set to 0.13 or more and 0.18 or less, no.
- the width ratio (W1 / W2) between the wide hole portion and the extending portion of the drainage hole is less than 1.00 as in FIG. 3, the width of the wide hole portion is narrower than the width of the extending portion. Inferior. No.
- the width ratio (W1 / W2) between the wide hole portion and the extended portion of the drainage hole is larger than 1.70 as shown in FIG. 4, an excessive load is applied to the neck portion that is a boundary portion between the extended portion and the wide hole portion. It will take. For this reason, a crack occurred at the neck portion, resulting in a problem in durability.
- the opening area ratio Sh is set to 0.13 or more and 0.18 or less, and the width ratio (W1 / W2) between the wide hole portion and the extending portion of the drainage hole is larger than 1.00 and 1.70.
- the hot-rolled plate guides used in 1 to 11 were made of a material having a Vickers hardness of 36 to 41 Hv. No. 4 except for No.4. Even if any of 1-3, 5-11 was used for a predetermined period (six months), the steel sheet was not wrinkled, and the scratch resistance was good.
- Hot Rolled Steel Sheet 10 Hot Rolling Line 15 Finishing Roller 18 Coiler 20 Cooling Floor 21 Table Roll 27 Cooling Nozzle 30 Hot Rolling Plate Guide 31 Nozzle Hole 32 Drainage Hole 33 Wide Hole (Second Hole) 34 Extension (first hole)
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Abstract
Description
2)水を供給するノズル向きの微妙な位置のずれ
3)ノズル内面にランダムに脱着することでノズル吐出流の向きの微妙な変動の原因になる、水に含まれる気泡
ノズル内面への気泡の付着によりノズル吐出流の向きは微妙に傾く。その気泡が脱離するとノズル吐出流の向きは真っ直ぐに戻る。この現象が各部位でランダムに繰り返し発生してノズル吐出流の向きが微妙に変動すると考えられる。
1.00<W1/W2≦1.70 ・・・(1)
以下に、本発明の一実施形態である熱延通板ガイドについて、図1~図4を参照して説明する。本実施形態である熱延通板ガイド30は、例えば図1に示す熱間圧延ライン10において使用されるものである。
図1に示す熱間圧延ライン10は、スラブ1を加熱する加熱炉11と、加熱されたスラブ1を粗圧延して粗圧延材5aとする粗圧延機12と、粗圧延材5aを再加熱する誘導加熱装置13と、を備えている。また、熱間圧延ライン10は、粗圧延材5aを圧延して所定厚さの熱延鋼板を製造する仕上圧延機15と、仕上圧延後の熱延鋼板5を所定温度に冷却する冷却床20と、冷却された熱延鋼板5を巻き取るコイラー18と、を備えている。
次に、この熱間圧延ライン10を用いて熱延鋼板5を製造する手順について説明する。図1に示すように、まず、スラブ1が、加熱炉11に装入されて入口側から出口側に向けて搬送されるとともに加熱される(加熱工程)。加熱されたスラブ1が粗圧延機12に装入される。粗圧延機12によって粗圧延がなされ、粗圧延材5aが製造される(粗圧延工程)。
本実施形態に係る熱延通板ガイド30は、冷却水の排水性向上と強度向上とを両立させるため、板幅方向における排水孔32の幅広孔部33を延在部34より拡張させることで、より多くの衝突流を排水孔32より排出させるように構成されている。
以上、熱間圧延ラインの概要と本実施形態に係る熱延通板ガイド30の構成およびその作用とについて説明した。本実施形態である熱延通板ガイド30においては、排水孔32は、通板方向Fに向けて延在する延在部34と、通板方向Fにおける延在部34の両端部に、板幅方向に拡大された幅広孔部33とからなる。したがって、板幅方向に隣接するそれぞれのノズル孔31、31を介して噴射された冷却水W同士が衝突する領域に形成された延在部34から隣接するノズル孔31、31を介して噴射された冷却水Wの衝突流が排出される、排水孔32の開口面積を確保することができ、冷却水Wの排水をさらに促進することができる。
E=(板幅中央部の温度変動幅)-(1/3位置における温度変動幅)
10 熱間圧延ライン
15 仕上圧延機
18 コイラー
20 冷却床
21 テーブルロール
27 冷却ノズル
30 熱延通板ガイド
31 ノズル孔
32 排水孔
33 幅広孔部(第2の孔部)
34 延在部(第1の孔部)
Claims (6)
- 熱間圧延ラインにおいて熱延鋼板を搬送するテーブルロール間に配置される熱延通板ガイドであって、
前記テーブルロール間に配設された冷却ノズルに対応する位置に設けられた複数のノズル孔と、搬送される前記熱延鋼板の板幅方向に隣接する前記ノズル孔同士の間に形成された排水孔と、
を備え、
前記排水孔は、搬送される前記熱延鋼板の通板方向に向けて延在する第1の孔部と、前記第1の孔部の前記通板方向の両端部に形成され、前記板幅方向に拡大された第2の孔部とからなることを特徴とする、熱延通板ガイド。 - 前記排水孔は、前記第1の孔部の幅W1と前記第2の孔部の幅W2とが下記式(1)を満たすように形成されることを特徴とする、請求項1に記載の熱延通板ガイド。
1.00<W1/W2≦1.70 ・・・(1) - 前記熱延通板ガイドは、熱延鋼板より軟質な材料である樹脂から形成されていることを特徴とする、請求項1または2に記載の熱延通板ガイド。
- 前記熱延通板ガイドを形成する材質のビッカース硬度は、36以上125未満であることを特徴とする、請求項3に記載の熱延通板ガイド。
- 鉛直方向上方から見て、前記熱延通板ガイドの上面全体の面積に対する前記ノズル孔及び前記排水孔の開口面積の割合である開口面積比Shが、0.13以上かつ0.18以下の範囲内に設定されていることを特徴とする、請求項1~4のいずれか1項に記載の熱延通板ガイド。
- 前記熱延通板ガイドは、前記テーブルロールのロール幅の中央部に配置され、前記熱延通板ガイドの幅は前記テーブルロールのロール幅の1/2以下に構成されることを特徴とする、請求項1~5のいずれか1項に記載の熱延通板ガイド。
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JPS59137111A (ja) * | 1983-01-28 | 1984-08-07 | Nippon Steel Corp | 熱鋼板冷却装置 |
JPH08238518A (ja) * | 1995-03-03 | 1996-09-17 | Sumitomo Metal Ind Ltd | 鋼材の均一冷却方法およびその装置 |
JPH10323709A (ja) * | 1997-05-28 | 1998-12-08 | Nkk Corp | 鋼板の冷却装置 |
JP2009202174A (ja) * | 2008-02-26 | 2009-09-10 | Nippon Steel Corp | 均一冷却性と通板安定性に優れる熱延鋼帯の冷却装置および冷却方法 |
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JPH10137833A (ja) * | 1996-11-07 | 1998-05-26 | Hitachi Ltd | 圧延機用ストリップ冷却設備及びストリップ冷却方法 |
KR101291832B1 (ko) * | 2008-07-16 | 2013-07-31 | 제이에프이 스틸 가부시키가이샤 | 열강판의 냉각 설비 및 냉각 방법 |
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JPS59137111A (ja) * | 1983-01-28 | 1984-08-07 | Nippon Steel Corp | 熱鋼板冷却装置 |
JPH08238518A (ja) * | 1995-03-03 | 1996-09-17 | Sumitomo Metal Ind Ltd | 鋼材の均一冷却方法およびその装置 |
JPH10323709A (ja) * | 1997-05-28 | 1998-12-08 | Nkk Corp | 鋼板の冷却装置 |
JP2009202174A (ja) * | 2008-02-26 | 2009-09-10 | Nippon Steel Corp | 均一冷却性と通板安定性に優れる熱延鋼帯の冷却装置および冷却方法 |
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