TWI261000B - Hot rolling method and apparatus for steel strip - Google Patents

Abstract

A hot rolling method and apparatus for producing hot rolled steel strip free from variation in material properties in the width direction by making a temperature profile uniform over the entire width direction of a rough bar at a finishing mill entry side or exit side are provided, which hot rolling method of steel strip heating a rolling material while changing a temperature rise in a width direction of the rolling material so that a temperature profile in a width direction of the rolling material at the finishing mill entry side or exit side becomes uniform, for example, heating so that at least the temperature rise at a center of the rolling material in the width direction becomes greater than the temperature rises at intermediate parts between that center and the two edges in the width direction or heating so that the temperature rises at the two edges of the roughing mill in the width direction become greater than the temperature rises at the intermediate parts in the width direction of the width direction.

Description

1261000 玖 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 发明 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术 技术A hot rolling method and apparatus for producing a high-yield hot-rolled steel plate by a predetermined temperature distribution. L· ^ Technical background The hot rolling of the steel plate, as shown in the figure i, is carried out in the heating furnace i, after being filled into the low temperature flat steel blank 2, and then heated to a predetermined temperature, and then re-twisted After the flat steel blank 2 is calendered to a predetermined thickness by the roughing mill 3, it becomes a rough-rolled part 4, and then the head and tail of the rough-rolled part 4 is cut by the shearing head machine 5, and the coarse-breasted part is heated by the end heater 6. Both ends of the width direction of 4 are recovered to restore the temperatures of the both ends, and then the continuous finishing mill 7 composed of a plurality of stands is used to finish the predetermined hot-rolled steel sheet, and then cooled by the cooling stage 8 on the cooling zone. Then take the reel 9 to take it. Further, before the finish rolling, the rough-rolled piece is joined to the finish-rolled piece and then subjected to finish rolling, and IK is performed as shown in the second g, after the low temperature flat steel blank 2 is placed in the heating furnace. Heating to a predetermined temperature, reheating to steel embryo 2 to roughing mill 3 [extend to pre-thickness thickness, become a rough hopper bucket, take the winding 匡 (7) roll 20 and then take a cutting machine! Cutting the front end of the rough-rolled piece which is wound by the winding and rewinding, the rear end of the seven-sided rough-rolled piece is joined to the front end of the subsequent rough-rolled piece by the welding device 12, and then heated by the end heater 6 Both ends of the width direction of the rolled piece are restored to restore the temperatures of the both ends, and then the continuous finishing mill 7 composed of a plurality of stages is finished by rolling into a predetermined hot-rolled steel sheet, and then cooled on the 1261000 area. The cooling stage 8 is cooled and then taken up by the reel 9. In the hot rolling or ring rolling step of the hot-rolled steel sheet described above, since the low-grade flat steel is reheated in the heating furnace, not only the occurrence of partial heat cannot be avoided, but also the thickness of the rolled material is relative to the width of the sheet. Small, so the problem of lower temperature is generated at the two ends of the rough rolling. The lower temperature at both ends will result in uneven temperature distribution in the width direction of the rough-rolled part, failure to have a predetermined temperature of the knife cloth, and unevenness in the lean temperature. Therefore, if the temperature distribution in the width direction of the rough-rolled part is not uniform, in the finish rolling, the hot-rolled steel sheet will have a flange or intermediate bulge, and the material properties such as the mechanical properties in the width direction of the hot-rolled 1 〇 steel sheet may be uneven. And other issues. In order to prevent the above-mentioned problem of uneven temperature distribution in the width direction of the rough rolling member, a method of providing a heating device and an end heater between the roughing mill and the finishing mill to heat the rough rolled product after rough rolling by the roughing mill is known. . For example, Japanese Laid-Open Patent No. 3-314216 proposes an electromagnetic induction heating device for heating the entire width direction of the rough rolling member between the roughing machine and the fine dryer 15 and for heating the rough rolling member. The end portions of the both ends are added with a crying electromagnetic induction heating device and an end heater, and the width direction of the fine dip=roughness is uniform. Here, the electromagnetic induction heating coil used is wound around the outer circumference of the board, and the magnetic field characteristic of the magnetic field is surrounded by the board, and the board surface can be heated and set to be 'characterized: it will have a relationship with the board. The heat is evenly tempered, so the temperature distribution in the width direction of the plate is almost a smattering, and the full width can only be heated at a uniform temperature. That is, the above-mentioned technique is intended to reduce the rolling load by 20 1261000 黾, i; the heating device uniformly heats the entire width direction of the rough-rolled part, and at the same time heats both ends by the end heating machine to make the width direction Become a uniform temperature distribution. However, the inventors of the present invention have studied the material properties 5 in the width direction of the hot-rolled steel sheet, and as a result, found that the thick (four) on the inlet side of the concentrate machine is heated by the mouth-heating machine to the lower temperature end portion. The width/direction of the knife cloth is made uniform, and the material properties in the width direction of the steel sheet obtained after the rough rolling are still dispersed. In other words, between the roughing mill and the finishing mill, the heating method of uniformly heating the entire width direction of the rough rolling member and heating the end portions of the end heater to a lower temperature can not make the width direction material property of the hot rolled steel sheet. Homogenize. Regarding the reason, after conducting various experimental investigations, it was found that the reason was when the flat steel embryo was heated in the heating furnace. The reason is: the heating furnace is heated in a high temperature atmosphere, the temperature at the center of the thickness of the flat steel is inevitably lower, and the temperature distribution will exist even if the thickness is thinned after rolling, so 15 is relative to The average temperature in the width direction is lower at the center and becomes longer toward the end. Since the temperature distribution does not change even if the thickness of the sheet after rolling is reduced, the temperature distribution in the width direction of the roughened product is left-right asymmetrical, and the central portion is lower with respect to the average temperature in the width direction, and becomes higher toward the end portion. The end is the lowest temperature. The reason lies in such a temperature distribution. Therefore, the problem of uniformizing the material characteristics in the direction of the sill is not known by the heating method of providing the end heater or the electromagnetic induction heating device. Therefore, an object of the present invention is to provide a temperature increase amount in a sheet width direction of a rough-rolled product (the highest temperature rise in the central low-temperature portion in the width direction), and a rough-rolled part by a population side or an outlet side of a 1261000 (four) finishing mill The width direction becomes a pre-temperature distribution 'and is stable (four) a hot-rolling method and apparatus for hot-rolled steel sheets having a material-quality characteristic in the width direction. Further, in view of the above, the steel sheet (steel strip) has a temperature distribution in the width direction of the steel sheet. Another object of the present invention is to provide a method of controlling the width direction of the steel sheet in any field which can be heated. Further, another object of the present invention is to provide a temperature distribution in the width direction of the rough-rolled material on the inlet side or the outlet side of the finisher by heating and heating the central low-temperature portion and the low-temperature portions at both ends of the rough-rolled product. Both are thickened, and the temperature is increased by 10 = the total temperature of the dry parts to reduce the load of the fine (4), and the fines can be made at a temperature of 2 to the required material characteristics to produce a high-yield material in the width direction. Hot rolling method and apparatus for hot rolled steel sheets which will be dispersed. Another object of the present invention is to provide a low temperature portion of the central low temperature portion and both end edges of the roughened product, and to eliminate the left and right asymmetric temperature distribution in the width direction, so as to be on the inlet side of the finishing mill. The hot rolling method of the hot-rolled steel sheet in which the temperature distribution in the width direction of the thick dry member is uniform, and the finish rolling is performed at a temperature at which the desired material property is obtained to obtain a high yield and the material properties in the width direction are not dispersed. And equipment. 2. The inventors found that in order to obtain a hot-rolled steel sheet in which the material properties in the width direction are not dispersed, it is necessary to make the temperature distribution in the width direction of the thick dry member on the inlet side of the dryer more uniform, and therefore, by causing the cause When the flat steel is heated, the central portion of the rough-rolled part of the lower end of the flat steel is heated and heated, and at the same time, the lower temperature of the both ends of the coarse milk produced during the rough rolling is increased by 1261000. The present invention has been completed by hooking the temperature distribution in the width direction of the rough-rolled product and heating the entire width direction to secure the finish rolling temperature, and it is preferable to use an alternating-type induction heating device having excellent heating characteristics as the heating means. 5 10 15 As a stamping component (semi-finished product) for body components such as automobiles, it is used for special semi-finished products with different strength in the width direction. When the special semi-finished product is stamped to form a vehicle body member, the mechanical properties of the predetermined portion of the body member must be different. In the past, it has been generally used to weld a plurality of dough strips into a special semi-fastened buckle. 'But in recent years' has been, for example, to hot-rolled steel strips in a cooling zone (ROT) after water cooling, by changing the width direction of the steel strip. A method of manufacturing a special semi-finished product without performing welding under the condition that the cooling rate is different in the width direction of the steel strip (for example, Japanese Laid-Open Patent Publication No. Hei. No. 2000-11541). However, in this method, there is a need for a steel strip heating method and apparatus which can effectively make the temperature difference in the width direction of the steel strip different. Compared with changing the cooling rate in the width direction of the steel strip, it is found that by the finishing rolling, the temperature difference in the direction of the γ-visibility of the steel is different, and a special semi-finished product having mechanical properties, particularly excellent in hole expansion ratio and tensile properties, can be produced. . In the case of the hot-roller L-steel that does not disperse the material properties in the width direction, the temperature distribution in the width direction of the thick-drying parts on the inlet side of the finishing mill is necessary to be 'required' to be caused by the flat steel. When the embryo is heated, the temperature of the flat steel in the flat steel is lower, and the temperature of the central portion of the rough-rolled part is heated and heated. In order to obtain a special semi-finished product with different temperature difference in the width direction of the front steel plate (thick dry part), it is necessary to Heat up any area in the width direction of the coarse emulsion by 20 1261000. Therefore, it has been found that a rolling mill heater composed of a plurality of AC-type induction heating devices is disposed in the longitudinal direction of the steel sheet (thick dry member), so that the dry heat exchangers are moved in the width direction of the steel sheet in the longitudinal direction of the steel sheet. In addition, there is a portion in which the overlap is increased (the total amount of temperature rise is increased), and the temperature distribution in the width direction can be controlled by the twisting operation of each of the rolling mill heaters, which can increase the temperature in any direction in the width direction of the steel sheet. The present invention has been completed. In the hot rolling of steel in the past, the flat steel billet is heated to a predetermined temperature and then calendered into a rough rolling mill by a roughing mill, where the coarse (4) is used as a fine dryer: 10 15 20

Before the rolling, the front and rear ends of the long direction of the rough-rolled product were cut and dropped by the cutter as a head piece.

One of the purposes of cutting the front and rear ends of the rough-rolled piece is to cut the shape of the front and rear ends of the rough-rolled part to prevent false rolling of the finish rolling, and another purpose is to remove the low temperature of the front and rear ends. Part. If the low temperature portion of the front and rear ends of the coarse emulsion is retained, the steel strip is broken at the low temperature portion during the finish rolling, and the surface of the processing roller is scratched. The flaw on which the surface of the roller is placed is not subjected to rolling of the subsequent roughing, and the roller is transferred to the product at a predetermined interval in accordance with the rotation period of the roller, and becomes a defect on the surface of the product. Therefore, the tip cutting blade at the front and rear ends of the rough-rolled piece is generally not only the portion 215 in which the front and rear portions are not well-formed, as shown in Fig. 27, but the so-called fish tail portion is cut, and The shape-defective portion is removed to the lower portion of the shape having a good shape on the center side in the longitudinal direction, and the lower portion has to be cut at the cutting position 219 in the past. "In Japanese Laid-Open Patent Publication No. Hei. No. 2-6002, the apparatus for cutting the ends of the rough-rolled parts by the front and rear ends of the rough-rolled parts by the head shearing machine is also described. It is called the end heater) heating the longitudinal end portion 5 10 15 :=. Because of the heating in the longitudinal direction, the end heater having the ability to have only the end portion in the localized direction is moved to support, so heating When the front and rear ends of the coarse dry member are required, it is necessary to stop the rough rolling member from being stopped on the conveyor belt, so that when the front end portion is heated, the temperature difference between the portion contacting the conveying roller and the non-contact portion becomes large. At the rear end portion, the rough-rolled piece enters the condensing machine, and the conveyance of the coarse-drying piece cannot be stopped, and the heating is performed sufficiently. Japanese Patent Laid-Open No. 1()_291() No. 16 is disclosed in the rough Between the machine and the precision machine, an invention is provided for the electromagnetic induction heating of the whole of the rough rolling part in front and rear of the material cutting machine. The front and rear ends of the rough rolled piece are cut by the material head Before cutting or cutting off the bad shape part, after passing through the electromagnetic type When the heating device is turned on, the low temperature portion of the front and rear end portions in the longitudinal direction is not stopped, and when the finish rolling temperature is raised to the temperature above the start temperature of the ferrite iron, the hot rolled steel strip is formed by finish rolling. Generally, the low temperature portion is not cut, and only the poorly shaped portion is removed, so that the yield is not lowered. However, at the stage before the finish rolling, the temperature at the front and rear ends of the roughed product is lowered, and the closer to the most The larger the front end or the last end, the lower the temperature at the most front end or the last end than the general part. (: Above. The characteristics of the electromagnetic induction heating device are uniform heating regardless of the width or length direction. The maximum heating amount of the piece determines the size of the heating device. To compensate for the 2 〇 at the front and the end (the temperature drop above rc) requires a huge heating device, the investment amount of the device will become larger. Another 20 1261000 - aspects, When a general-sized electromagnetic induction heating device is used, the temperature reduction of the front and rear ends of the roughed product up to 200X cannot be compensated, and the front end and the last end other than the shape will be disabled. The temperature does not rise sufficiently, and therefore, the low-temperature residual portion has to be removed as a tip sheet. 5 SUMMARY OF THE INVENTION The present invention is to provide a method for heating without removing the rough-rolled parts. Great equipment investment, and can fully increase the temperature of the lower temperature part of the forefront and the last end of the roughing piece, and can only use the poorly shaped part 10 as the hot rolling equipment for the head piece removal. The present invention has been completed for the purpose of the arrangement and the hot rolling method. The gist of the present invention is as follows: (1) A method for hot rolling a steel sheet by heating to change the amount of temperature rise in the width direction of the rolled material on the inlet side or the outlet side of the finishing mill, The temperature in the width direction of the rolled material is a predetermined temperature distribution. 15 (2) A method of heating a steel sheet by moving a plurality of rolling mill heaters disposed in the longitudinal direction of the steel sheet in the width direction of the steel sheet, The rolled piece participates in the heat engine heating operation to control the temperature distribution in the width direction of the steel sheet. (3) A method of heating a steel sheet by moving a plurality of rolling mill heaters disposed in the longitudinal direction of the steel sheet in the width direction of the steel sheet, and having overlapping portions in the longitudinal direction of the steel sheet 20, by controlling the overlapping portion The amount - the amount to control the temperature distribution in the width direction of the steel sheet. - (4) A method for heating a steel sheet according to item (2) or (3), wherein when the central portion of the width direction of the steel sheet is concentratedly heated, the plurality of rolled pieces are heated to the center in the width direction of the steel sheet , heating operation. 12 1261000 (5) - The heating method of the steel sheet according to item (2) or (3) is to move the plurality of rolled heaters in the width direction to a certain interval when heating the entire width direction of the steel sheet , heating operation. The method for heating a steel sheet according to any one of the items (1) to (3), wherein the temperature distribution in the width direction of the steel sheet is measured by a width direction thermometer disposed on the upstream side of the rolling stock heater, and based on The measured temperature distribution determines the amount of movement of each of the rolling stock heaters. (7) A heating method for a steel plate according to any one of items (1) to (3), which is movable within the coil. (8) A hot rolling apparatus for a steel sheet, wherein a heating device for changing the temperature rise amount of the rolled material in the direction of the rolled sheet is disposed on the inlet side of the roughing mill in the rolling line, between the roughing mill and the roughing mill, and the roughing mill and Between finishing mills or between finishing mills and finishing mills. (9) A hot rolling apparatus for a steel sheet according to item (8), wherein the heating means is capable of heating a temperature rise amount of at least a central portion in a width direction of the rolled material to be larger than a central portion and a plate width direction The intermediate between the two ends is repaired with a large amount of temperature. (10) A hot rolling apparatus for a steel sheet according to item (8) or (9), wherein the heating means heats the temperature rise of both ends of the rolled material in the sheet width direction to a plate width The amount of temperature rise in the middle of the direction is large. - (11) A hot rolling apparatus for a steel sheet according to item (8), which is provided with a heat generating device for changing the amount of temperature rise in the width direction of the rolled material, and heating only the rough rolling The central low temperature part of the rough rolling piece; the mountain vertical part heater is used to heat the low temperature parts of both ends of the rough rolled piece. 13 1261000 (12) A hot rolling apparatus for steel sheets according to item (8), wherein a heating device is provided on the inlet side of the finishing mill for changing the temperature increase in the width direction of the rolled material; One end heater is used to heat the low temperature parts at both ends of the rough rolled piece; and a temperature mastering device is used to hold the temperature distribution in the I degree direction of the rough rolled piece; X, and further configured: - In the device, the maximum value of the temperature in the width direction grasped by the temperature control device is used as the reference temperature, and the difference between the temperature at each point in the width direction and the reference service is obtained, and the temperature increase amount at each point is determined based on the temperature difference to make the width wide. The direction temperature is a predetermined temperature distribution; and a control device, the heating device and the end heating device are actuated based on the heating amount to make the temperature distribution in the width direction of the rough rolling member uniform. (13) A hot rolling apparatus for steel sheets according to item (8), wherein the heating means is disposed at least two or more along the rolling line. (14) A hot rolling apparatus for a steel sheet according to item (8), wherein the heating means 15 is an alternating current type induction heating device capable of changing a temperature rise amount in a sheet width direction of the rolled material. (15) A hot rolling apparatus for a steel sheet according to item (14), wherein the alternating type induction heating means is an alternating current type induction heating device having at least two or more widths in the width direction of the core. 20 ( 16) A hot-rolling mill for steel sheets in which the material properties in the direction of the visibility are not dispersed is used in a heating device having a steel sheet having a flat steel billet heating furnace, a rough rolling mill, and a finishing mill, and has an AC type. The induction heating device is only for heating the central portion of the steel plate; an AC-type induction heating device is capable of heating the full width of the steel plate, and the temperature rise of the end portion can be heated to be larger than the central portion of 14 1261000. (17) A hot-rolling apparatus for a steel sheet in which the material characteristics in the width direction of the item (16) are not dispersed, wherein at least one of the alternating-type induction heating devices capable of heating the central portion of the steel sheet has a core width of 4 In the range of 〇〇~700 mm, the heating plate can be heated to a full width and the temperature rise of the end portion can be heated to a core width of at least one of the AC induction heating devices larger than the central portion in the range of 800 to 2500 mm. (18) A hot rolling equipment arrangement between the roughing mill and the finishing mill, in which alternating-type induction heating means for inducing heating of the entire width direction of the rough-rolled part and cutting length direction of the rough-rolled part are arranged The cutting machine of the front piece at the front end. (19) A hot rolling equipment arrangement between a roughing mill and a finishing mill, in which a cutting machine for cutting a head piece at the front and rear ends in the longitudinal direction of the roughing piece and a heating roughing section are in turn arranged A 15-type AC-type induction heating device in the width direction. 2)) a hot rolling method using a hot rolling equipment having the hot rolling equipment configuration of item (10) or (19) and heating and rolling the front and rear end portions of the rough rolled piece with the aforementioned alternating type induction heating - The part of the square or both is at least lm below the end. 21) The hot rolling method according to item (20), wherein the temperature of the low temperature portion of one or both of the front and rear end portions of the rough dry member is raised by heating, thereby obtaining the material of the rough rolled product The amount of cutoff is reduced. 22) A hot rolling mill for steel sheets, which is provided with a heating furnace for heating to a steel blank, a roughing mill for roughing flat steel blanks, and a finishing mill for finishing rough rolling of rough rolled parts 15 20 1261000 The utility model is characterized in that: (4) (4) between the finishing mills, an alternating-type induction heating device for increasing the amount of the steel plate is provided, and the upper two sides, or the two alternating-type induction heating devices are tilted A tilting device in the width direction of the rolling line.

(9) a hot rolling apparatus for a steel sheet, which is provided with a heating furnace for heating a flat steel blank, a rough rolling mill for rough rolling flat steel, and a finishing mill for rough rolling of fine milk after roughing, The utility model is characterized in that: between the roughing machine and the finishing mill, a plurality of upper and lower one (four) parent flow type induction heating devices are arranged along the width direction of the rolling line and the output of each alternating type induction heating device can be adjusted. Adjust the device. (24) A hot rolling apparatus for steel sheets, which is provided with a heating furnace for heating flat steel embryos, a coarse dryer for rough rolling flat steel embryos, and a fine milk for finely drying the coarsely rolled raw materials. The machine is characterized in that: · an AC-type induction heating device is provided between the roughing machine and the fine machine.

Further, an inaccessible shielding body for changing the magnetic flux of the alternating current type induction heating device in the width direction of the rolling line is provided. BEST MODE FOR CARRYING OUT THE INVENTION In the first embodiment, it is known that in order to obtain a hot-rolled steel sheet having predetermined material properties in the width direction, for example, the material in the width direction is not dispersed, it is necessary to rough-roll the inlet side of the finishing mill. The temperature distribution of the parts in the visibility direction is checked. In the past, the end portions of the rough-rolled rough-rolled pieces were heated by an end heater to make the temperature distribution in the width direction of the coarse 16 1261000 rolled pieces uniform. However, the end portion of the rough-rolled product is heated by the end heater, and the hot-rolled steel sheet after the finish rolling has a problem that material properties are dispersed in the width direction. Therefore, the inventors have conducted various experiments for this reason, and the result is that when the flat steel embryo is heated in a heating furnace. In other words, since the heating furnace heats the flat steel in a high-temperature atmosphere, as shown in Fig. 3(a), the heated flat steel 2 has a high temperature portion around it but has a width of 1/2 width. At the center of the section, the low temperature φ portion 13 cannot be avoided. Then, the surface temperature of the flat side of the flat steel is measured, and as shown in the third (b), the central portion of the middle Z line (CL) is compared with the average temperature in the width direction. Low (120 (rc), higher towards the end (123 〇 it). After rough rolling of the flat steel of this temperature distribution into rough-rolled parts, as shown in Figure 4^), two of the rough-rolled parts 4 Since the end portion is a portion 15 in which the cooling is large, the temperature distribution of the roughened member is as shown in Fig. 4(b), and the temperature at the central portion of the center line 1/2 is wide with respect to the average temperature of 15 in the width direction. Lower (1〇33.〇, the middle part between the center and the end is higher (1056.〇, then, at least from the ends of the ends to the lowest at 100mm (1002t:), becomes M-shaped Temperature distribution. After the rough rolling of this temperature distribution is finished, as shown in Fig. 4(c), even if the thickness is reduced by finish rolling, the temperature distribution of the M shape is maintained, and the central portion is 842. °C, the middle part is the highest (865.〇, the end is 8〇〇.〇. The above flat steel embryo heated by the heating furnace, the rough rolled after rough rolling and the width of the steel plate on the finishing side The temperature distribution is as shown in the fifth (a), (b), and (c) graphs. The temperature distribution in the width direction of the M-shape is shown in Fig. 6. In the past hot rolling method, the end heater is heated. 17 261 端 端 〇〇〇 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 表面 表面 表面 表面 表面 表面〇, near the end is the coffee (4) temperature, in order to compensate for the lower temperature of the rough-rolled rough-rolled ends, and the end heaters to heat the ends of the rough-rolled parts, as in the third) In the figure: the temperature rise of the part indicated by the slanting line is 16 and the temperature of both ends is raised to 1G56 ° C. However, the temperature of the central low temperature part is (10) 3. The enthalpy is not in the 'visibility direction'. The distribution is not uniform. This state has been judged in the past to be that the temperature distribution in the width direction of the rough-rolled part has been uniformized. 10 15 20 The rough-rolled piece at both ends is heated by the end heater, even after the finish rolling, even the plate thickness Thinning, the temperature distribution in the width direction of the rough-rolled part (4) remains unchanged, and the temperature in the width direction of the hot-rolled steel sheet on the σ side of the roughing mill , as shown in the figure ,), the central part has a lower average temperature in the width direction, which is 842. 又. Further, when the electromagnetic type induction heating device is used as the heating device for the rough rolling member, when the entire direction of the rough rolling member is heated, Then, as shown in Fig. 7. Fig. 7(4) shows the temperature distribution in the width direction of the flat steel. This temperature distribution: the temperature distribution in the width direction of the roughened piece formed after rough rolling of the flat steel, as in 7(b) As shown in the figure, the central low temperature part is (8) generation, and the maximum temperature of the middle part is 56 C end ' 'degree of 1002 ° C. When this rough rolled piece is electromagnetically induced heating, the uniform heating direction is visible, the whole It is only possible to raise the temperature as indicated by the oblique line. In the dish 17, the central portion becomes 1〇46°C, the middle portion becomes l〇69°C, and the end 4 becomes 1015 C. However, the temperature distribution in the width direction at this time is still a U-shaped/dish distribution. Therefore, the hot-rolled steel sheet having the U-shaped width direction in the width direction is obtained by the fact that the rough-rolled product in the visibility direction is uniformly heated by the electromagnetic induction heating device by a roughing machine, as shown in Fig. 7(4). The above-mentioned inventors have found that in the past, when using the flat steel embryo which was heated by the heating furnace, it was found that the method of heating the thick dry parts by the end heating device in the past was induced by electromagnetic induction. The heating device heats and heats the width of the thick and dry parts in the direction of the 5th, and the temperature distribution in the width direction of the steel plate on the inlet side of the rolling mill is different from the past idea, and the width direction of the hot rolled steel plate is found. Material properties create problems with dispersion. Then, it was found that the heating of the flat steel embryo in the heating furnace and the heat release of the end portion of the pressure-delayed portion caused the temperature distribution in the width direction of the rough-rolled material to be uneven, and the reason why the material property of the steel sheet was dispersed in the width direction of the steel sheet was dispersed. . Therefore, in the present invention, in order to make the temperature distribution in the width direction of the rough-rolled product on the inlet side or the outlet side of the finishing mill, the amount of temperature rise in the width direction of the sheet is changed, and the temperature distribution in the width direction of the rough-rolled material is made uniform. In this case, it is preferable that the temperature rise amount of the central portion of the plate width including the width of the roughened piece i / 2 is at least intermediate with the intermediate portion between the center portion of the 15 and the plate width direction (including the width of the ridge and the width of the ridge) The amount of temperature rise of the portion is large, and further, it is preferable that the end portion heater has a low temperature portion in which both end portions in the width direction of the φ plate (at least from the both ends to the center of the plate of 1 mm) The amount of temperature rise is larger than the amount of temperature rise in the intermediate portion of the plate width to uniformize the temperature distribution in the width direction of the roughed product. In the present invention, the "central portion" or the "central low-temperature portion" in the width direction of the rolled material, such as the rough-rolled material, is as described above, and includes the highest temperature in the width direction. The 1/2 wide position of the plate is wide in the central portion of the area. In addition, the "intermediate portion" of the plate width is as described above in the width direction except for the "central portion".

The highest temperature range including the temperature distribution in the width direction, that is, the area of 1/4 width and 3M 19 1261000 wide. As long as the temperature distribution in the width direction is made medium

Regarding the heating device, the temperature rise of the central part is large, 疵. As for the parent flow type induction device, since it is different from the electromagnetic induction heating device, it has a characteristic that the specific portion in the width direction of the rough rolling member can be uniformly heated according to the core width, so that a plurality of stages are arranged along the rolling line. An AC-type induction heating device having a narrower width than a rough-rolled product, for example, when a combination of two or more core-type induction heating devices having a narrower width than a rough-rolled product, can heat a specific portion in a desired width direction. Further, as shown in Fig. 8, the AC 15 type induction heating device 20 is formed by winding the coil 19 outside the core 18, and can be disposed at the upper and lower positions of the steel plate 21, so that the operation is easy and the roughened surface is not formed. The enthalpy is generated, and since the upper surface is not excessively heated, the arrangement relationship with other devices such as a calender and a descaler is not limited. The present invention will be described below in the drawings. In the hot rolling apparatus shown in Fig. 1, between the roughing mill and the finishing mill, as shown in Fig. 9(a), the induction heating device and the end heater are disposed to form a hot rolling device. The inlet side of the three AC-type induction heating devices 2 3, 2 4, and 25 having a narrow core width wider than the rough rolling member is provided with an inlet side width direction thermometer 2 2 'the outlet side is provided with an outlet side width direction thermometer 2 6 as a temperature monitoring device for 20 1261000 width direction. The rough-rolled piece 4 which has been calendered by the roughing mill is conveyed in the direction of the arrow by the conveying roller. The temperature distribution in the width direction of the rough-rolled product 4 is measured by the inlet-side width direction thermometer 22, and the temperature rise of the rough-rolled parts by the respective AC-type induction heating devices 23, 24, and 52 is determined by the temperature increase amount control device based on the temperature distribution in the width direction. the amount. After the rough-rolled product is heated by the AC-type induction heating device 2 3 in the vicinity of the central low-temperature portion, the intermediate portion near the 1/4 width of the central portion is heated by the AC-type induction heating device 24, and further heated by the AC-type induction heating device 25. The middle portion of the center portion is near the 3/4 width. Then, the low temperature portion at both ends of the rough rolling member (at least from the end portion in the sheet width direction to the center 10 side of the plate of 100 mm) is heated by the end heater 6 (the amount of temperature rise in the intermediate portion in the sheet width direction is large). The above heating and heating amounts are all controlled by the temperature increase amount control means. The temperature distribution in the width direction of the heated roughened product was measured by the outlet side width direction temperature meter 26. When the temperature distribution in the width direction measured by the outlet side width direction thermometer 26 is not uniform, the measurement data is returned to the AC type induction heating device 15 and the end heater 6, and the control device changes and controls the amount of heating of each heating device. The output, etc., makes the temperature distribution in the width direction of the roughed piece uniform. Regarding the uniformity of the temperature distribution in the width direction, the temperature deviation of the temperature distribution in the width direction is preferably 〇° C. However, in the present invention, the temperature deviation in the width direction is preferably at least 5 inches, preferably 5° C. or less. allow. 20 Here, the core width of the plurality of induction heating devices does not have to be the same, and can be appropriately changed in accordance with the temperature distribution in the sheet width direction. For example, as shown in Fig. 9(b), the induction heating device 27 having the core width of twice the induction heating devices 24 and 25 is replaced by the induction heating devices 24 and 25 of the Fig. 9(a), and the induction heating device 23 is provided. Two sets are also available. 1261000 The AC induction heating device and the end heater of the plurality of stages are not necessarily arranged in the order of arrangement shown in the figure 9(a) and (b), but it is preferable to approach each other in consideration of the overall temperature controllability. Further, in order to accurately grasp the temperature, it is preferable to set the width direction thermometer as the 5 temperature grasping device in the vicinity of the AC type induction heating device as described above, but it may be based on the furnace temperature in the heating furnace and the outlet side of the heating furnace. The actual temperature such as the temperature of the flat steel and the conveying conditions (rough rolling conditions, conveying speed, time from the heating furnace to the induction heating device, etc.) to the rough-rolling material in the vicinity of the induction heating device, after numerical calculation, setting the exchangeable The apparatus for inducing the temperature distribution in the width direction of the inlet side of the apparatus can also be used. Alternatively, a thermometer in the width direction may be provided on the exit side of the finishing mill to grasp the temperature distribution in the width direction on the inlet side of the AC induction heating device. An example of the temperature rising characteristics of the alternating current type induction heating device will be described with reference to Fig. 1 . 15 Figures 10(a) to (c) show the temperature rise distribution of the rough rolling member 4 when three heating devices 23, 24, and 25 having the same core width are used for heating. Fig. 10 is an example in which the temperature of the roughed product is uniformly raised to a maximum of 40 °C in accordance with the core width of the heating device. Also, the temperature rise outside the width of the core is gradually reduced. 20 The temperature rise distribution of the three AC-type induction heating devices is increased. Since the temperature rise amounts of the three units are increased, the heating devices 23, 24, and 25 are separately heated as shown in Fig. 10(d). The temperature rise amounts of 29 and 30 overlap, and it becomes a gentle mountain-shaped temperature rise distribution in which the amount of temperature rise in the width direction changes. Therefore, for example, it has a central maximum low temperature portion of 1060 ° C and an intermediate maximum temperature of 126 1000 degrees 1100. . In the rough-rolled product of the zigzag-shaped temperature distribution, the total temperature rise amount (fused) shown in Fig. 10(4) is obtained by the three AC-type induction heating devices, and the central portion in the width direction can be made uniform to 11 〇 (the temperature distribution of rc. The both ends are heated by the end heating, so the temperature can be increased according to the temperature of the end heater (four). As a result, the temperature deviation in the width direction of the roughed product is equalized to 5. The following. The deviation of the characteristics (for example, the strength 3.8) can be suppressed to 5% or less. Further, the width of the core of the AC-type induction heating device having a narrow width used in the present invention is preferably in the range of _~7 G () mm Μ 0 10 The most representative of the board is the most tender (10)~__, (4) the suppression type = the part only heats the center 'therefore, it needs the AC type induction heating clothes of 100~150mm width. Also the above description is to obtain the material in the width direction will not be dispersed. In the case of hot-rolled steel sheet, the width of the rough-rolled product on the inlet side of the roughing mill is as an example of the temperature distribution, but conversely, when the steel sheet having different material properties in the sheet width direction is obtained, it is only necessary to follow the width direction of the sheet. Separate material In the second embodiment, the temperature deviation is obtained in the direction of the plate width. In the second embodiment, the steel material has different mechanical properties in the width direction of the steel strip, and (4) the special steel (four) which is expanded and stretched (four). Before the spinning, the width direction of the steel sheet has different temperature differences, and the hole expandability of the steel sheet after the finish rolling can be effectively improved by the hot rolling temperature. For example, it will be C: 0.09~〇.11%, Si: 13〇~ When the _ 〜 〜 〜 10 10 10 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 〜 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 59 The end portion is subjected to the drawing process. The hole expansion ratio needs to be stretched in the processing of the steel sheet. For the stretch flange fastening portion, the steel strip is 70% or more, and more than % is preferable, and the processing ratio for the sheet is required. 31% or more 'more preferably 34 〇 / 〇. The following is a review of the conditions for obtaining the above mechanical properties. 10 15 20 Figure 11 (4) shows the hot rolling temperature α) and the hole expansion ratio of the 590MPa high tensile steel sheet ( Relationship diagram of %), the u(8) diagram shows the hot rolling temperature of 59〇Mpa grade high tensile steel sheet [alpha]) and stretched EL (%) of the diagram. As shown in the nth (4th) diagram, the expansion ratio of the steel strip is improved as the hot rolling temperature is increased, but as shown in Fig. 11(b), the elongation of the steel strip is lowered in response to an increase in the hot dry temperature. That is, the hole-expanding property and the tensile property are opposite to each other with respect to the hot rolling temperature. From the 11th (a) diagram, in order to make the hole expansion rate more than 70%, the hot rolling temperature must be as shown by the arrow (four) generation, and, as seen from the first chart, in order to make the elongation rate reach 31 When the value is above %, it must be indicated by the arrow that the temperature range required by one can be different. However, in order to obtain a steel strip having both characteristics, it is only necessary to control the hot rolling temperature within a range of ～88 〇, which is extremely narrow (in the range indicated by oblique lines), but the temperature is still controlled within the range. Difficult, and even in temperature conditions, there is still a problem of a decrease in yield due to material dispersion. In the present invention, by making the hot rolling temperature in the width direction of the steel strip different, the hot emulsion temperature near the center of the steel τ visibility is 8 7 〇 or more, and the steel strip has a width of 860 ° C or less. The central portion of the width of the steel strip is heated to a temperature of 24 1261000 or more above 2 °C, which can be easily fabricated in the vicinity of the center of the steel band with a hole expansion ratio of 7_, and the 1/4 width to the end of the steel strip has 31% or more. A special steel strip with different mechanical properties with a tensile ratio of 1 degree. However, the heating device required for the production of a special steel plate having a uniform material property in the width direction and a material having a different material width in the width direction, that is, the temperature distribution in the width direction of the steel plate can be arbitrarily controlled, and the temperature distribution in the width direction can be made uniform or effective. A heating device that makes the temperature in the width direction different has not been proposed so far. The present inventors conducted intensive studies on a heating method and apparatus for a steel sheet which can arbitrarily control the temperature distribution in the width direction of a steel sheet, and found that a plurality of rolling stock heaters composed of an alternating current type induction heating device are disposed in the longitudinal direction of the steel sheet (calendering line) In order to move the heaters of each of the rolled products in the width direction, by controlling the amount of overlapping portions of the rolling stock heaters in the longitudinal direction of the steel sheet, the heaters of the respective rolling stocks are heated to operate, and the temperature distribution in the width direction can be arbitrarily controlled. 15 Fig. 12(a) shows a diagram of the heaters and the amount of temperature rise in the width direction of the steel sheet, and the 12th (b) to (e) shows the heating of three rolling pieces in the longitudinal direction of the steel sheet. A diagram of the amount of temperature rise in the width direction of the steel sheet when the heaters of the respective rolled products are shifted by a predetermined amount in the width direction. As shown in Fig. 12(a), in the center portion of the steel sheet 21, a rolling mill heater 20 (parent type induction heating device) 22 is disposed, and when the heating of the rolling stock heater is performed, the temperature distribution of the steel sheet in the twist direction is distributed. 23 corresponds to the width of the rolling stock heater (core width) into a mountain type of temperature rise distribution. Three sets of rolling mill heaters having such a temperature rising characteristic are disposed in the longitudinal direction of the steel sheet, and each of the rolled product heaters is shifted by a predetermined amount in the width direction of the steel sheet (the center of the width direction is the reference of the amount of movement. 1261000 5 10 15

In the case where the momentum is 〇), for example, in the figure 12(b), the amount of movement is 〇, and when the dry heaters are all overlapped, the temperature rises of the three heaters are combined: , as shown in the following figure. As shown in the figure, the width direction of the steel plate causes the temperature rise distribution of the central part to be the highest. In the figure, the dry heater of the middle (four) does not move, and the heaters of the upper part and the downstream side move in the opposite direction to make the rolling In the example in which the overlap of the heaters is reduced, the amount of temperature rise of the heaters of the I-roller will be increased as the amount of movement (4) is shifted, as shown in the following figure, which becomes wider in the direction of the steel plate. The distribution of the temperature rise of the mountain type, then, in the first diagram, the movement of the two rolling mill heaters on the upstream side and the downstream side is larger than that of the We's drawing. In the case of the reduction, the total temperature rise distribution of the three dry heaters becomes a wider temperature distribution than the mountain of the 12th (4). In addition, the 12th (e) figure is a case where the rolling stock heater is moved in a wide f direction, and the distance between the rolling stock heaters is not overlapped, and the case where the heating width is the whole is become a mountain wider than the 12th (4) figure. Type of heating amount distribution.

Further, the moving rolling stock heater is not limited to the downstream side, and the same temperature distribution can be achieved regardless of which dry heater is moved. In the above example, the case of three sets of the L-shaped heaters is shown, but the number of the hot-rolling heat exchangers is increased, the total heating amount can be increased, and the temperature-increasing amount distribution in the width direction of the steel sheet can be controlled with high precision. That is to say, 'by making the plurality of sets (two or more) of the heaters in the direction of the visibility of the steel plate, the steel plate can be changed in the width direction, so that the direction of the steel plate is in any direction. Control the temperature distribution in the width direction. In addition, the rolling stock heater can be moved inside the coil, and the rolling stock heater can be used after combining the 126 heaters of the same width and/or different widths. Further, by controlling the heating amount of the heating element and the distance between the cores in the respective coils of the plurality of rolled heaters, the temperature controllability can be further improved. For example, when the temperature at the center of the steel plate (roughness) is low, an example in which the temperature deviation in the width direction is improved by using a 35-piece rolling mill heater will be described. As shown in Fig. 13(a), the temperature of the 15 〇〇mm wide roughing piece is mainly 40°C lower (indicated by a broken line) at the center of the temperature. In order to raise the temperature at the center of the steel plate by 10 °C in the reverse (10) and to make the temperature distribution in the width direction uniform, the temperature is increased by using three rolling mill heaters (1 liter/pan in the oblique line). The total amount of temperature rise (indicated by the solid line) of the three hot-rolled heaters must be a gentle mountain-type temperature increase distribution (reverse type) of 40 °C in the center. In order to achieve this temperature increase amount distribution, as shown in Fig. 13 (13), the distance between the iron cores of the three rolling mill heaters and the temperature rise amount are the same, and three rolled pieces of 6 mm width are heated to ( Two rolling mill heaters (Ν〇1 & Ν〇·3) in Νο·1 to 3) are moved 15 ft in the center of the center of the width direction (the distance in the plate width direction is 750 mm). Heating operation. In other words, in the direction of the width direction of the plate, the distance from the center of the 600 mm to 900 mm # (the center of the plate sees the direction is 15 mm), the overlap of the cores of the three rolled heaters of the 〇1 to 3, the plate In the direction of the width of the shovel (5) ～600mm (based on the center of the plate width direction _3〇〇mm~150mm) 'There are overlapped parts of the iron core of the two rolled heaters No. 1 and 2' and further' The board is oriented at a distance of 75 〇 mm to 900 mm (based on the center of the board width direction, +15 〇mm to +300 mm), and there are overlapping portions of the cores of the two rolled heaters of Νο·2 and 3. As a result, the temperature-increasing amount distribution of each of the rolling stock heaters (Νο·1~Νο·3) is a mountain type with a small gradient, and the temperature rise of the three units is 27 1261000. The method of determining the amount of heating of the steel sheet is based on the difference in the width of the steel plate (crude material), the difference in the amount of movement of the rolling stock heater, and the difference in the amount of heating of the milk heater. The curve is stored in the computer 5, and the temperature direction distribution of the steel plate in the width direction of the upper side of the rolling stock heater is grasped. In order to heat the difference between the temperature distribution curve and the width direction of the target, the computer selects the closest movement amount, The amount of temperature rise is commanded by the electric ordering device by setting the amount of movement of the rolled piece heater (the amount of overlapping of the milk piece and the heater) and the amount of heating. Thereby, any field in the 10 width direction of the steel sheet can be obtained. Further, the method of moving the rolling stock heater can be performed by, for example, setting up a rolling stock heater on a trolley that can walk on the road, and moving the trolley by a driving device. The rolling stock heater can be moved in the width direction of the steel sheet. Then, by adding (four) lifting and lowering of the upper and lower rolling members, the 15 gap of the rolling stock heater can be adjusted. Embodiment 3 ^ Hot rolling shown in Fig. 1 In the apparatus, between the roughing mill and the finishing mill, as shown in Fig. 18, the alternating type induction heating device 123 having a larger core width than the roughened product (10) and the width of the core are 2 Narrow AC-type induction heating device 124 Two types of cross-type induction heating devices with different core widths and end heaters 106 are used as hot rolling devices. On the inlet side of two AC-type induction heating devices with different core widths The inlet side visibility direction thermometer 122 is provided, and the outlet side width direction thermometer 125 is provided on the outlet side. The roughened product 1〇4 which is rolled by the roughing mill is conveyed in the direction of the arrow by the conveyance roller 28 1261000. The thermometer 22 measures the temperature distribution in the width direction of the rough-rolled product 4, and determines the temperature rise amount of the rough-rolled piece heated by each of the AC-type induction heating devices 123 and 124 by the temperature increase amount control device based on the temperature distribution in the width direction. Then, although the rough-rolled piece is heated to its full width by the AC-type 5-way heating device 123 having a wide width, in particular, the low-temperature portion at both ends is heated and heated, and then the alternating-type induction heating device 124 having a narrow width is only When the low temperature portion of the both ends of the roughened product is insufficiently heated by the AC type induction heating device having a wide width, if necessary, the end portion may be heated by 10 to perform additional heating and heating. The temperature distribution in the width direction of the roughened product is measured by the outlet side width direction thermometer 125. When the temperature distribution in the width direction measured by the outlet side width direction thermometer 125 is uneven, the measurement data is sent back to the AC type induction heating device. The heating amount control device controls the output of the heating device to control the temperature rise of each heating device, and 15 the temperature distribution in the central portion of the width direction of the rough rolling member is made. The temperature distribution in the width direction is uniform, and the temperature deviation in the width direction is preferably 〇°c. However, in the present invention, the temperature deviation in the temperature distribution in the width direction is preferably 1 (TC or less, and preferably the following). The arrangement order of the AC type induction heating device and the end heater having a narrow width and a wide width is not limited to 20, but it is preferable to consider the temperature control property to be close to each other. Further, for accuracy, The width direction thermometer of the temperature mastering device should be installed in the vicinity of the AC type induction heating device as described above, but it is also possible to set the measured temperature based on the temperature in the furnace in the heating furnace, the temperature of the flat steel shell on the outlet side of the heating furnace, and the vicinity of the induction heating device. The rough rolling material conveying conditions (rough rolling 1261000 conditions, conveying speed, time from the heating furnace to the induction heating device, etc.) may be numerically calculated to grasp the temperature distribution in the width direction of the inlet side of the alternating type induction heating device. A width direction thermometer is arranged on the exit side of the finishing mill to grasp the width direction temperature of the inlet side of the AC induction heating device The degree of 5 is also acceptable. An example of the temperature rise characteristic of the alternating type induction heating device will be described with reference to Fig. 19. When the rough type is heated by the alternating type induction heating device of different widths, the 19th (a) and (b) drawings are used. The temperature rise distribution of the rough-rolled product. (a) shows the temperature rise distribution of the temperature rise 10 126 of the AC-type induction heating device 124 having a narrow core width as shown in Fig. 18, and (b) shows the 18th. The temperature rise distribution of the temperature rise amount 127 of the AC type induction heating device 123 having a larger core width than that of the roughened product is shown in Fig. 19(a), and the AC type induction heating device 124 having a narrow core width corresponds to The width of the core can uniformly raise the temperature of the central portion of the roughed product to a maximum of 40 ° C. Then, since the temperature is increased by 15 in addition to the width of the core, the amount of temperature rise is gradually reduced, and the temperature is gradually reduced. Further, as shown in Fig. 19(b), the AC-type induction heating device 123 having a core width larger than that of the rough-rolled product can raise the temperature of the full width of the rough-rolled product to a maximum of 40 °C. At the same time, from the characteristics of the current at both ends of the roughed piece, The temperature of both ends of 20 to about 150 mm is raised by a maximum of 150 ° C. Therefore, the total amount of temperature rise of the two AC-type induction heating devices 123 and 124 is as shown in Fig. 19 (c), and the width direction of the roughened member is The temperature distribution is uniformized. Further, a plurality of AC-type induction heating devices of different widths are arranged along the rolling line, and when combined, the 1261000 temperature distribution of the rough-rolled parts can be finely adjusted. The output of the AC induction heating device can also change the heating temperature. Also, the temperature rise of the end of the roughing member caused by the end heater is 116, as shown in Fig. 19(d), if the heating end is used The heater is at least 150mm wide at the end of the heater, and the temperature at both ends can be raised by up to 150 °C. Therefore, when the amount of heating and heating of the both ends of the alternating type induction heating device having a wide width is insufficient, as described above, the end heater can additionally compensate the temperature of both ends of the temperature rise. Further, the width of the core of the AC type induction heating device having a narrow width used in the present invention is preferably in the range of 400 to 700 mm. The reason for this is that the representative minimum plate width of the hot-rolled steel sheet is 550 to 800 mm, and in order to suppress the heating of the end portion, only the center is heated, so that an AC type induction heating device having a width of 100 to 150 mm is required. Further, the width of the core of the AC induction heating device having a large width is preferably in the range of from 800 to 2,500 mm, particularly from 800 to 2,000 mm. The reason for this is that in order to perform end heating, a core width having a width of the same width as the width of the plate of 500 mm is necessary. Therefore, in order to heat a steel plate which is typically a minimum plate width of 550 to 800 mm in the hot rolled steel sheet, 800 mm is preferably used. A wide AC induction heating device, and a heating type of 1500 mm to 20 2000 mm for a representative hot rolled steel sheet, a 2500 mm AC type induction heating device should be used. Embodiment 4 As shown in Fig. 24, regarding the heating device for heating the rough-rolled part 201 between the roughing mill 202 and the finishing mill 203 in hot rolling, the electromagnetic induction heating shown in Fig. 29 is used in the past. The device heats the full width of the roughing. The electromagnetic type 1261000 induction heating device was only found to be used as an end heater for heating the wide end of the roughed piece. When the electromagnetic induction heating device is used as a full width heating device for a rough rolling member, since the end portion of the rough rolling member is overheated or the shape of the inductor is complicated, a large current cannot flow, which is difficult to be a problem of a large-capacity device. 5 Therefore, for the above reasons, the use of an alternating current method as a means for heating the full width of the rough-rolled part is difficult to employ. In the electromagnetic induction heating device, the coil 232 is disposed around the rough-rolled piece 201, and the cores 233a, 233b are disposed above and below the rough-rolled piece 2〇1. In the present invention, the AC type induction heating device 10 204 having this difficulty is used as a heating device for inducing heating of the entire width direction of the rough rolling member 201, so that the front end portion and the last portion of the rough rolling member 2〇1 can be obtained. The temperature at the lower portion of the end portion is sufficiently raised, and only the portion having a poor shape can be removed as the head piece. When using the AC-type induction heating device 2〇4 shown in Fig. 23 to induce the heating of the full width of the 15 rough-rolled parts, the portion other than the rear end portion before heating in the long direction is induced as shown in Fig. 25(b). The current 222 flows widely through the coarse-grained member 2〇1, and the rough-rolled piece is uniformly heated in the longitudinal direction. On the other hand, when the front and rear ends of the long direction of the thick dry member pass through the heating device, for example, the front end portion of the thick dry member 2〇 is shown in the 25th (4th), the current is induced by the alternating type induction heating device 2〇4, and the current 222 is induced. As a result of focusing on the flow at the foremost end portion (2), the temperature rise amount of the last end portion 223 (and the last end portion) of the rough rolled product 1 increases due to the induction current addition. For example, when an AC type induction heating device having a capacity for increasing the temperature of the constant portion of the rough rolling member by 30 1 is used, the solid line 22 of the second paste is not known from the foremost end portion 223 (or the last end) of the rough rolling member. In the range of 32 1261000, the temperature rise amount is increased, and the temperature rise amount exceeding 2 〇〇 ° C can be obtained at the foremost end portion 223 (or the last end portion). In the case of a heating device having the ability to raise the intermediate portion by 6001, the temperature rise of the most front end portion 223 (or the last end portion) of the roughed product may exceed 4 所示 as indicated by a broken line 224b in Fig. 26. Hey. In the present invention, since the AC-type induction heating device 4 can induce heating in the entire width direction of the rough rolling member 201, it is not necessary to stop the rough rolling member 201 when the rear end portion is heated before the rough rolling member 2〇1. By passing at the same speed as the intermediate portion of the roughened product 2〇1, the large front and rear end temperature rises as described above can be obtained. In the first embodiment, as shown in Fig. 24(a), between the roughing mill 202 and the finishing mill 203, the hot rolling mill 201 is sequentially arranged to induce the heating of the rough rolling stock 201. The AC-type induction heating device 204 of the entire width direction and the cutter 208 capable of cutting the scrap pieces of the front and rear ends of the rough-rolled product. Generally, a material head shearing machine is used as the cutting machine 2〇8. In the embodiment of the present invention, the front and rear ends of the rough-rolled product after the rough rolling are first heated by the induction heating device 204, and then the material is cut by the cutter 2〇8. Further, before the roughing mill 202, the heating furnace 2〇7 is disposed, and after the finishing mill 2〇3, the winding device 209 is disposed. In the second embodiment, as shown in the 20th (24th), the hot rolling mill of the present invention is arranged such that the rough rolling mill can be cut between the roughing mill 202 and the finishing mill 2〇3. The cutting machine 2〇8 of the head piece at the front and rear ends of the direction and the AC type induction heating device 204 for inducing heating of the entire width direction of the rough rolling piece. Generally, the same as the description, the head shearing machine is used as the cutting machine 2〇8. In this case, in the form of resentment, the front and rear ends of the rough-rolled parts after the rough rolling are first cut at the cutting head by cutting 33 1261000, and the virtues are the ancestors. • • Silly to induce heating device 204 to heat up. As described above, the temperature of the rough-rolled product 2〇4 of the AC-type induction heating device 2〇4 is the highest value of 5 at the foremost end portion and the last end portion in the long direction. Therefore, if the head piece of the front and rear ends can be cut and heated, the highest temperature rise amount can be made into a normal portion of the non-head sheet, and it can be effectively utilized. In the first embodiment, when the induction heating is performed, since the material head is not cut, the temperature at the foremost end portion or the last end portion of the roughed product is lowered, and the heating method is sufficient to induce heating. Ground compensates for the amount of temperature reduction. On the other hand, in the second embodiment, since the induction heating is performed after the material is cut at the most appropriate position, the temperature can be lowered at the most appropriate position of the heating ability of the rear end portion before the induction heating device is engaged. The cutting was carried out, and as a result, in the second embodiment, the amount of cutting of the material 15 was reduced as compared with the second embodiment. If the thickness of the rough-rolled part on the inlet side of the finishing mill is very thick and the finishing rolling reduction rate is large, in order to miniaturize the structure, the toughness of the product is increased, and the thickness of the rough-rolled part is controlled by the allowable cutting torque of the cutting machine. When the thickness is thick, the material head is cut off in the south temperature state by the third sorrow, and the deformation resistance is lowered by 20 due to the high temperature. The relative cutting capacity of the cutting machine is increased, and the product can be further drawn. Sexual improvement. In the hot rolling method of the present invention, the hot rolling equipment having the hot rolling equipment configuration of the first or second solid type is used to heat one of the rear end portions of the coarse milk product by the alternating type induction heating device. Or 34 1261000 from the end of the two parties, at least lm below. The reason for inducing heating in the portion from the end portion of 11} 1 or less is that the lower temperature portion of the end portion before and after the temperature rise can be sufficiently heated, and the amount of cutting of the material head can be reduced. Here, when heating the head piece of the rough-rolled piece, the "end portion" of the front and rear end portions of the so-called rough-rolled piece refers to the fishtail valley of the shape-defective portion 215 (fishtail) shown in Fig. 5-27. The portion 216, that is, the position of the reference point 217. Of course, it is also possible to induce heating of the entire length of the rough rolling piece by using the same alternating type induction heating device. With this method, even if the flat steel billet heating temperature before the rough rolling is set to a lower value, the lean temperature can be raised to the most suitable temperature of 10. Since it is difficult to intermittently change the temperature of each adjacent flat steel in the heating furnace, the temperature change of several 〇1 is performed in units of several flat steels. Therefore, in order to be able to be charged into the heating furnace at a low temperature, And it is necessary to extract from the heating furnace above the target temperature. It is necessary to burn the high temperature 15 filled with the low temperature enthalpy into the furnace and waste it to the target extraction temperature, thereby generating a heating furnace; By using the parent flow type induction heating device to induce heating of the entire length of the thick dry material in the direction of φ, the low temperature filler can be extracted at a low temperature to reduce the fuel loss of the heating furnace. When extracted at high temperature, there will be 2 peelings on the surface of the product, and entering Luyan will eventually damage the appearance of the coil. - To ensure the appearance of the surface, it can be used to reduce the cooling of the rolled surface during rough rolling to fine drying. However, the power of the power is 'planning to save electricity, or to cool the rolled parts in an air-cooled manner, or to increase the number of rough rollings in order to reduce the loss of the coverability. The heat-drying method t of the present invention is performed by the above heating. Will 3 5 1261000 The temperature of the lower part of the front and rear ends of the rough-rolled part or the temperature of the lower part is increased by heating, thereby reducing the amount of cutting of the rough-rolled material. In the past, rough rolling was not performed. When the front and rear ends of the long part are heated, the front end portion of the roughed product is cut off as a material head in addition to the shape defect portion, that is, near the end portion 213 before the rough rolling member 2〇1 is displayed. In the 27th (a), the cutting position is 219 in the past. 10 On the other hand, the cutting position of the material at the rear end of the roughing is different depending on the thickness of the hot rolled steel coil after rough rolling. A thin material having a thickness of 3 mm or less has a lower temperature portion as a material head, and a thicker material having a thickness of more than 3 mm, regardless of the temperature of the rear end portion. Use the inside of the bad shape as the cut position

15 set. That is, in the 27th (b)th view showing the vicinity of the end portion 214 after the rough rolling member 201, the material of the crucible is cut at 21% in the past cutting position, and the thick material is α: the cutting position of the knife 219b cut off. The rear sill portion of the material having a thickness of more than 3 thick is a case where the shape defect portion is not completely removed and the residual portion is rolled. The following is a description of the calendering under the defective portion of the residual shape, and the calendering pattern when the front end bites away from the rear end and

20 The effect of the shape of the evil on the thickness of the product coil. At the end of the month j, the remaining part of the shape of the plate is broken. When the work roller is bitten, the front end portion is folded into two nips, which causes fatigue on the working roller: especially when the thickness of the steel coil is thin. Specially, "It's also big, but even if the thickness of the coil is thick, the scratches at the front end of the low temperature will be printed on the work rolls:: The work rolls will also be damaged. X, when the residual part of the shape of the fish is large, the sharp part of the L will be hung to the side guide, 36 1261000 by the feeding of the calender, wrinkles will be formed between the calender and the machine In order to remove it, it is necessary to stop the production line for a long time. For the above reasons, the risk of remaining the shape defective portion at the time of the front end biting is considerable.

When the rear end leaves, the shape defect portion is elongated by 10 to 20 times in the rolling direction according to the predetermined reduction ratio. For example, the non-intermediate portion of the fish shape is calendered as in a plurality of machines. When the thickness of the coil is thin, the distribution of the rolling pressure due to the uneven temperature distribution in the width direction is poor, and the final end portion which is not restrained generates a turning moment, and the meandering is in contact with the side guide 10 in the width direction (4). There is a problem that the so-called lower end becomes smaller. In the case of a thin material, the shape defect portion is also cut off, and the production line needs to be stopped due to the exchange of the work rolls. Therefore, the productivity is hindered, so that the risk of remaining the shape defect is large.

20, - w ping ping reverse 吋 (more than 3mm thick material), the tail end becomes smaller 15 conditions will almost never occur. The reason is that since the plate is thick, it does not fold inward even if it is in contact with the side guide. In contrast, due to the small repetition rate, the fish-shaped abnormal portion of the calender is short, the load is low, and the rotation is low. The torque is small. In addition, since the plate temperature is too low, the plate thickness is too large, and it is not easy to be broken. Therefore, the rear end portion is not subjected to the removal of the shape "all the parts are removed, but the residual portion is rolled. However, in order to enhance the mechanical properties, etc. The object is selected such that ordinary steel with low tensile strength such as alloy is not added. X, after the fish portion of the portion is rolled into a steel coil, the final binding is performed, and in the steel coil transfer, the binding band is loosened due to the residual portion of the fish portion. , or cut off, when they are tied, the binding part in the width direction of the product should be adjusted so as not to let the fish. The residual part of the 37 1261000 cross. Therefore, in thick materials with a thickness of more than 3 mm, for roughing After the end portion 214, even if the induction heating of the present invention is performed, the effect of reducing the amount of cutting of the head piece cannot be obtained. That is, the object of the roughing of the rough-rolled material 5 in the hot rolling method of the present invention is reduced. One or both of the end portion 213 of the rolled product and the end portion 214 after the rough rolling after the thickness of the steel coil is 3 mm or less. The alternating type induction heating device used for inducing heating in the width direction of the rough rolling member used in the present invention 204, As shown in FIG. 23, the 205 as the core meter is preferably a U-shaped iron 10 core 5' having two vertical portions 211 and one horizontal portion 212, and the two vertical portions 211 are faced to the surface of the roughened member 201. The width of the core 5 is a width which can cover the full width of the roughened piece 1, and the U-shaped cores (2〇5a, 205b) are arranged oppositely on the upper side and the lower side of the roughened piece 2〇1, and the coil 2〇6 Then, it is wound around the vertical portions (211a, 211b). Due to the coil 2〇6 wound in the vertical portion 211, magnetic % is generated, which is formed in the middle of the opposite two U-shaped cores, and the shape 15 is a closed magnetic field. Since the end faces of the vertical portions 2 11 of the cores are opposed to each other, a magnetic field is generated between the end faces, and since the rough-rolled members are disposed between the both end faces, a magnetic field perpendicular to the surface of the rough-rolled members is formed. The width of 5 has a width which can cover almost the full width of the roughened piece 2〇1, so that the 磁场^_/ is perpendicular to the magnetic field of the roughened piece 2〇1 across the rough piece 2. By winding the core The coil 206 of 2〇5 flows through the alternating current, and the magnetic field that penetrates the thick-cut piece 2〇1 also becomes & the flow magnetic field 'is formed as an induced current in the rough-rolled part. The eddy current. The relationship between the width of the roughened rolled piece and the width of the core 2〇5 is preferably that the width of the roughened piece is wider than the width W of the core. The reason is that although the alternating type induction heating device has a rough rolling to be heated End of the piece (end in the width direction) 38 1261000 Overheating 但 'But by making the core width w narrower than the thickness of the thick nip, it is possible to suppress eddy currents at the ends and suppress excessive heating of the ends. The width of the rough-rolled piece can be uniformly heated. By the interval between the upper side and the lower side of the rough-rolled piece, the heating and heating ability of the rough-rolled piece can be changed. The narrower the interval between the cores, the heating of the thick (four) The greater the amount of temperature rise, therefore, the narrower the spacing of the cores is usually as much as possible. However, the front end portion 213 of the rough rolling member has a shape, the narrower the core spacing of the induction twisting device 204, and the end portion of the rough rolling member having a light curvature cannot enter the gap of the iron core, and there is a collision. possibility. Therefore, when the leading end portion 213 of the rough 10 is advanced into the induction heating device 204, the core gap is enlarged in advance, and after the tip end portion is entered, the gap of the core is narrowed, and the heating temperature increasing capability is increased. When this correspondence is made, since the interval between the cores is large when the leading end portion 213 of the rough rolling member passes, the heating and heating ability of the induction heating device is low, and when the rear end portion 214 of the rough rolling member passes, the core interval is narrower than 15, Therefore, the heating and heating ability of the induction heating device becomes high. For example, in the induction heating device in which the iron core interval at the rear end portion of the rough rolling member is l3 〇 mm and the heating temperature rising ability at the last end portion is 500 ° C, the core interval is expanded to 340 mm when the leading end portion of the rough rolling member passes, and the result is as follows. The heating capacity of the front end portion is 250 〇C 〇20 When a plurality of AC induction heating devices are arranged in series, the whole can be regarded as a set of full width induction heating devices. The induction heating for each unit is medium capacity' to ensure the necessary capacity for the whole. In the past, although it was difficult to make a large-capacity induction heating device, this problem can be solved by arranging a plurality of medium-capacity heating devices. In hot rolling, the width of the roughed piece is 39 1261000. From 觅 to narrow, there are many types. The iron core width of each of the plurality of induction heating devices arranged in series is set to be the most suitable for the rough-rolled iron of the narrow width~ see, when performing the hot rolling of the rough-rolled parts having a large visibility, The induction heating device is moved in the width direction of the roughing member, and the full width 5 of the coarse dry member can also be heated. Regarding the transmission frequency of the parent flow type induction heating device, it is preferably 100 to 500 Hz. In the electromagnetic induction heating device, although the frequency of 1500 Hz is used, since the depth of the heating immersion is deep and the failure is caused by local heat generation, it is preferably 100 to 10 500 Hz in the alternating type induction heating device as described above. 〇 Embodiment 5 In order to obtain a hot-rolled steel sheet in which the material properties in the width direction are not dispersed, it is known that the temperature distribution in the width direction of the rough emulsion on the inlet side of the concentrate machine is required to be hooked. In the past, the temperature of the both ends (ends) of the rough-rolled parts which were produced during rough rolling was lowered by 纟 and α卩 was heated, and the width of the roughened parts was made by solving the asymmetry of the left and right temperature distributions. The direction temperature distribution is uniform. However, after investigation by the inventors, it was found that the end portions of the rough-rolled material were heated by the end heater to solve the asymmetry in the temperature distribution in the width direction, and the hot-rolled steel sheet after the coarsening was dispersed in the width direction. Therefore, the inventors conducted various experiments on the cause, and as a result, it was found out that the reason was that the heating furnace heats the flat steel embryo. That is, as shown in Fig. 30, in the high-temperature atmosphere of the heating furnace, the flat steel is heated by the preheating zone 313 and the heating belt 314 by the loading side in the direction of the arrow, and is taken out at a predetermined temperature in the soaking zone 315. The heating of the flat steel embryo is less in the heat input to the side end portion A of the flat steel blank in the heating direction of the 40 l26l furnace, and the heat input to the side end portion B is larger. Then, when the extraction door is opened and extracted by the soaking zone, the temperature of the heating flat steel blank to be loaded into the side end portion A is higher than that of the drawing side end portion 6. Therefore, the temperature around the width direction of the flat steel has about 2 〇. The difference between the 〇 5 5 shape. Further, as shown in Fig. 31(a), inevitably, the heated flat steel blank 3〇2 has a high temperature portion 316 around it, and a low temperature portion m is generated at the center portion, and then the rough rolling mill of the flat steel embryo is measured. The temperature distribution on the inlet side is the same as the average temperature in the width direction. The center of the center line (CL) is lower (mere) and higher toward the end (124〇t and 122〇. 〇, A temperature distribution of 10 in the width direction is approximately asymmetric.

When the temperature distribution is rough rolling of the steel blank into a rough-rolled piece, as shown in the third coffee diagram, the temperature distribution of the rough-rolled part is as follows because the both ends of the rough-rolled part are relatively large portions 318. As shown in Fig. 32(8), the average temperature in the width direction is lower (10) 3t in the center series L), and the height (10) 3 is higher between the center portion and the end portion. . And purchase. C) ‘Then, the end is the lowest and becomes the river-like temperature distribution. After rough rolling of the rough-rolled part of this temperature distribution, if the thickness of the finish rolling is thinner, the elbow-shaped temperature distribution is maintained, and the central part is 8421. (872t), the temperature in the middle of the right side is 8 5 8 °C. Further, when the induction heating device is used as a heating means for the rough rolling member, the induction heating device (4) is heated in the width direction, and (4) and (4) are used for illustration. The temperature distribution in the width direction of the flat (4) drawn from the heating furnace is as shown in Fig. 33(4). The width of the rough-rolled product after rough rolling of the flat steel of this temperature distribution is 41 20 1261000. The distribution of the degree of brewing is as shown in Fig. 33(b), and the central low temperature portion is 1〇33. 〇, the maximum temperature in the middle of the left side is 1063t. When the induction heating device is moved in the width direction to heat the rough-rolled product, the temperature rises only by the oblique line, the temperature rises by 1319, the central portion is 1063^, the left middle portion is 1〇83 art, and the right middle portion is 1069 C. . However, the temperature distribution in the width direction at this time is still in a word-like temperature distribution. Therefore, after the coarse-rolled product of the entire width is heated by the movement of the induction heating device to be rolled by the roughing mill, as shown in Fig. 33(c), a hot-rolled steel sheet having a U-shaped temperature distribution in the width direction is obtained. · As described above, the inventors have found that when hot rolling is performed on a flat 10 steel billet heated by a heating furnace, the method of heating the both ends of the rough-rolled piece by the end heater or moving the induction heating device is performed in the middle of the rolling. In the method of heating the coarse emulsion in the width direction, contrary to the idea of the past, the temperature distribution in the nine-degree direction of the steel sheet after the finish rolling is not uniform. Then, it was found that the temperature distribution in the temperature direction of the original rough-rolled part due to the asymmetry of the central low-temperature portion 15 of the flat steel embryo heated by the heating furnace and the temperature distribution in the width direction, and the cooling of the end portion of the pressure delay. Uneven hooking, ❿ becomes the biggest reason for the dispersion of the material characteristics of the steel Φ plate. In the present invention, in order to make the temperature distribution in the visibility direction of the rough rolling-rolling on the inlet side of the finishing mill uniform, the AC-type induction heating device is used, the central low-temperature portion of the rough-rolled part, and the low-temperature portion at both ends. However, at this time, 4 solves the asymmetry of the JnL degree distribution in the twist direction, and causes the AC-type induction heating device to tilt and heat up the temperature or, if necessary, additionally heats the low-temperature portion at both ends with the end heater, and compensates for the temperature rise. In order to make the temperature distribution in the width direction of the roughened piece hooked. The heating means for the central low-temperature portion of the rough-rolled material can be used as long as it has a width of 42 1261000 and a temperature rise distribution so that only the central portion can be heated and heated. The AC type induction heating device differs from the electromagnetic type induction heating device in that it has a characteristic of uniformly heating a specific portion in the width direction of the rough rolled member in accordance with the width of the core. That is, the AC-type induction heating device 5 having a narrow core width compared to the width of the steel sheet has an AC induction heating device capable of heating the central portion of the steel sheet in accordance with the width of the core, and having a wider core width than the width of the steel sheet, although the heating plate can be heated. It is wide, but has the feature that the heating amount of the end portion is larger than that of the central portion. Further, the AC type induction heating device is characterized in that the amount of temperature rise and the gap between the core 10 and the steel sheet are theoretically almost inversely proportional. That is, as shown in Fig. 34, when the AC induction heating device 302 is tilted in the width direction of the steel sheet (arrow direction 321), the gap between the core of the AC induction heating device and the steel sheet (GAP) changes, and the amount of temperature rise is changed. For example, in the AC type induction heating device at the position indicated by the solid line in Fig. 34(a), one of the temperature rising characteristics of the AC type 15 induction heating device when the output is 20 MW is as shown in Fig. 34(b). . It can be understood from Fig. 34 that the smaller the gap is, the larger the temperature rise is, and the larger the gap is, the smaller the temperature rise is. Then, the amount of temperature rise is almost inversely proportional to the distance of the gap. Therefore, since the gap distance can be changed by tilting the AC induction heating device, if the AC type induction heating device 20 is tilted by the temperature distribution in the width direction and the temperature is raised by heating, the heating temperature increase amount in the width direction can be adjusted, thereby eliminating The temperature distribution in the width direction of the plate is asymmetrical. Arranging a plurality of AC-type induction heating devices having different core widths on the rolling line, if at least one of the AC-type induction heating devices having a core width narrower than the width of the rough-rolled piece and at least one of the core widths is larger than the width of the rough-rolled parts 43 1261000 乂心i 诱 'The heating device is used in combination, and when heating and heating up, the specific part of the width direction of the central low temperature part and the low temperature part of both ends can be heated in the width direction of the rough-rolled part, and the temperature distribution in the width direction can be eliminated. symmetry. Further, as shown in Fig. 8, the AC type induction heating device 5 which is wound around the coil 19 on the core 18 is placed 2 turns, and is placed in the upper and lower positions of the steel plate (roughened product) 21, so that the operation is easy and rough rolling is performed. The surface of the part does not produce flaws, and due to its characteristics, the upper surface is not overheated, and the distance from other equipment such as calenders and descalers is not restricted. Hereinafter, the present invention will be described with reference to the drawings. 10 In the hot rolling apparatus shown in Fig. 1, between the roughing mill and the finishing mill, as shown in Fig. 35, the AC type induction heating device 325 having a core width larger than that of the rough rolling member and the core width are disposed. The alternating type induction heating device 324 having a smaller width than the roughing member has two different widths and can tilt the possible alternating type induction heating device in the width direction of the steel sheet, and the end heater 15 306' is disposed as a hot rolling device. On the inlet side of two alternating induction heating devices having different core widths, an inlet side temperature direction thermometer 326 is slanted, and an outlet side visibility direction thermometer 327 is provided on the outlet side. The rough-rolled part 3〇4 which is calendered by the roughing mill is conveyed in the direction of the arrow by the conveying roller. The temperature distribution in the width direction of the roughened member 4 is determined by the inlet side width direction thermometer 326 2 〇 ', and the heating of each of the alternating current type induction heating devices 324, 325 is determined based on the temperature distribution in the width direction to determine the amount of temperature rise of the rough rolling member. Then, the alternating type induction heating device is tilted with a predetermined gap. The rough-rolled piece is heated by the alternating-type induction heating device 324 having a narrow width, and only the central low-temperature portion is heated, and the wide-width alternating type induction heating device 325 44 1261000 is heated to its full width, but in particular, the low-temperature portion at both ends is heated. Then, when the temperature rise of the alternating-type induction heating device 325 having a large width is insufficient in the low-temperature portion at both ends of the rough-rolled product, the end heater 306 may be additionally heated and heated as needed. The temperature distribution in the width direction of the roughened product after heating was measured by a temperature of 5 degrees in the width direction of the outlet side. When the temperature distribution in the width direction measured by the outlet side width direction thermometer 327 is not uniform, the measurement data is returned to the temperature increase amount control device of the AC type induction heating device, and the control device changes and controls the temperature rise amount of each heating device. The temperature distribution in the width direction of the roughed product is uniform. The temperature rise characteristic of the AC induction heating device will be described below with reference to Fig. 36. The 36th (a) and (b) diagrams show the temperature rise distribution of the rough-rolled parts when heated by the AC-type induction heating device of different widths. (a) showing the temperature rise distribution of the temperature rise amount when the AC type induction heating device 324 having a narrow core width as shown in Fig. 9 is parallel (solid line) and tilting (dashed line), and (b) shows In the 35th 15th view, the temperature-increasing distribution of the temperature rise of the AC-type induction heating device 325 having a larger core width than the rough-rolled material is parallel (solid line) and tilting (dashed line). As shown in Fig. 36(a), when the AC type induction heating device 324 having a small core width is parallel and at a pitch of 200 mm, the temperature in the central portion of the roughed product can be raised to a maximum of 40 ° C, and the pitch is the shortest when tilting. The maximum temperature can be raised by 53 20 °C. Then, outside the core, since the temperature is raised by heat transfer, the amount of temperature rise is gradually reduced, and it has a gentle mountain shape. Further, as shown in Fig. 36(b), the AC-type induction heating device 325 having a core width equal to or greater than the width of the rough-rolled product can raise the temperature at the center of the full width of the rough-rolled member to 40 ° C, and at the same time The current at both ends will increase. Therefore, when the distance between 1261000 and 200mm is 200mm, the temperature at both ends can be raised by 150°C at a temperature of 150mm, and the distance between the two ends can be 250mm. When the distance between the left side is 150mm, the left end can be the largest. The temperature is raised by 200 ° C, and the right end portion can be heated by 120 ° C.

Therefore, as shown in Fig. 36(c), the total temperature rise of the two AC-type induction heating devices 324 and 325 of different widths can make the temperature distribution in the width direction of the rough-rolled material uniform. Further, by arranging a plurality of AC-type induction heating devices of different widths along the rolling line and combining them, the temperature-dividing state of the rough-rolled parts can be finely adjusted. Further, the width of the core of the narrowest AC type induction heating device 10 used in the present invention is preferably in the range of 400 to 700 mm. The reason for this is that since the representative minimum plate width of the hot rolled steel sheet is 550 to 800 mm, in order to suppress end heating and only heat the center, an AC type induction heating device of 100 to 150 mm width is required. Further, the width of the core of the AC type induction heating device having a large width is preferably in the range of 15 1000 to 2000 mm. The reason is that for the end heating, there is

It is necessary to use a core width equal to or larger than the plate width of a hot rolled steel sheet having a general plate width of 1000 to 2000 mm. The tilting device for tilting the AC-type induction heating device in the present invention, for example, as shown in Fig. 37(a), is provided with a shaft for tilting the AC-type induction heating device 320 suspended by the support body 328 329, and an elevator 330 is disposed at an end of the alternating current type induction heating device. When the end portion of the flow-type induction heating device is lifted and lowered by the elevator 330, the AC-type induction heating device can be tilted by rotating the shaft 329 as a center. Further, if the shaft is fixed, the shaft is rotated mechanically or electrically, and the shaft can be tilted even if it is not supported by the elevator. 46 1261000 Other examples, as shown in Fig. 37(b), the two ends of the AC induction heating device 320 are supported by two elevators 33, and the AC type induction can be induced by raising and lowering the ends by the elevator 33. The heating device is tilted. Further, the AC type induction heating device disposed on the lower side of the plate can be tilted by the same mechanism. 5 In the above-described embodiment of the invention, the AC type heating device is tilted as an example, but instead of tilting, the AC-type induction heating device which can be lifted and lowered is arranged in the 觅 direction for lifting and lowering to obtain the same effect. In other words, as shown in Fig. 38(a), a plurality of AC-type induction heating devices 320 are arranged in the width direction, and the elevators 333 are lifted and lowered, and the distance between the pitches is controlled by 1〇 to control the width direction. The amount of heating is increased. Further, the alternating type induction heating means in which the iron cores which can be lifted and lowered are arranged in the direction of the width of the plate are disposed opposite to each other on the roughened piece, and the same effect can be obtained even if the core is lifted and lowered. In other words, as shown in Fig. 38(b), the core 322 is divided into a plurality of 15 cores which are vertically movable in the width direction of the panel, and lifted and lowered by the lifter 333 to control the distance between the cores, thereby controlling the heating in the width direction. The amount of heating. Further, the elevators 330 and 331 can use elevators of commonly used piston mechanisms such as oil pressure and air pressure, elevators using a crank mechanism, or elevators using electric motors.

2 A In addition, a plurality of AC-type induction heating devices are arranged side by side in the width direction, and the same effect can be obtained by changing the respective outputs. That is, as shown in Fig. 3(c), a plurality of AC induction heating devices 320 are arranged side by side in the width direction, and the output control device 331 controls the respective outputs, and the respective AC induction heating devices 32 can be controlled. Heating the amount of heating. 47 1261000 Or, as shown in Figure 38(d), the AC-type induction heating device and the sturdy sturdy squid 1 can be used to control the induction heating of the shielding plate 3 3 2 that can change the magnetic flux. The heating effect of the device is increased to obtain the same effect. Further, in the eighth drawing (d), the shielding plate 332 is caused to be ejected between the upper and lower heating devices in the longitudinal direction (reverse rolling direction) of the roughened material 5 of the rough rolling member 304 to shield the magnetic flux from being shielded. Variation, but the shielding plate 332 can also be taken in and out of the width direction of the rough-rolled piece. According to the hot milk method of the present invention, the following remarkable effect can be obtained, that is, the rough rolling of the temperature distribution in the width direction of the rough rolling crucible can be made uneven. The width of the piece is uniformed at one degree in the width direction, and a hot-rolled steel sheet in which material properties such as mechanical properties in the width direction after finish rolling are not dispersed can be obtained. Further, according to the hot rolling apparatus of the present invention, the following remarkable effect can be produced, that is, by using the alternating current type induction heating device, the temperature distribution in the width direction of the rough rolling member before the finish rolling can be solved, and at the same time Selectively heating the central low temperature portion and the low temperature portion at both ends can make the temperature distribution in the width direction uniform. EXAMPLES (Example 1) After heating in a heating furnace to 120 (r thickness of 25 〇 surface, width of 125 〇 _ flat steel embryo after rough rolling, into a rough rolled piece of thickness 3Gmm. Then, the coarse dry piece to the first The three AC-type induction heating devices with a width narrower than that of the rough-rolled parts shown in Fig. 9(4) are heated, and the temperature rise at the center is the largest, and then the end heater is used for concentrated heating at the end. Then, the fine is performed by the finishing mill. Rolling, manufacturing a hot-rolled steel sheet with a thickness of 2 mm and a width of 1250 mm. At this time, the finishing rolling speed is 1 〇〇〇 mpm, and in order to ensure that the finishing temperature of the finishing rolling side is 48 1261000, the temperature of the finishing side must be ll. 〇〇°C. The temperature distribution at the inlet side temperature of the finish rolling varies with the temperature distribution in the width direction and the heat dissipation in the long direction. This temperature reduction is compensated by three heating devices and the end heater. The temperature distribution of the thermometer before the heating of the steel plate is 10 °C at the center, ll〇〇°C at the middle, and 10〇40°C at the coldest point. The 1/2 part of the central part is heated up to 20 °C in total. The temperature rise amount of the intermediate portion between the portion and the end portion is smaller than that of the central portion, so as to solve the temperature deviation of the central portion, and the end portion is heated by the end heater in a concentrated manner by 60 ° C. Thereby, the width before the rolling is performed. The deviation of the temperature distribution in the 10 direction can be uniform to 3 ° C, and as a result, a steel sheet having a small dispersion of the material (strength) in the width direction and the long direction can be obtained. According to the hot rolling method of the present invention, the following remarkable effects can be produced, that is, The temperature distribution in the width direction of the rough-rolled product before the finish rolling is uniform, and the hot-rolled steel sheet of which the material properties such as the mechanical properties in the width direction after the finish rolling are not dispersed can be obtained. Further, according to the hot-rolling apparatus of the present invention, the following may be produced. A remarkable effect is that the temperature distribution in the width direction can be made uniform by selectively heating the central low temperature portion of the roughened product before the temperature rise finish rolling. (Example 2) Hereinafter, the present invention will be described in detail by way of examples. Invention In the hot rolling, three AC-type rolling mill heaters (BH, BH2, and BH3) of the same width of 600 mm are used, and four types of rough-rolled steel sheets having widths of 900 mm, 1200 mm, 1500 mm, and 1 800 mm are used. Rough rolling) While the rolled heater is moved while being widened in the width direction, tests (a) to (e) for uniformizing the temperature distribution in the width direction of the steel sheet are performed. Further, the distance between the cores of the upper and lower rolled heaters 49 1261000 is 3 segments. The change is 1.2 10 mm, 2.160 mm, and 3.130 mm. Then, the temperature rise amount and the temperature rise amount difference of each stage are respectively determined. Further, in the test (e) having a width of 900 mm, the twisting of the additional end heater is further performed. 5 The test conditions and the temperature rise are shown in Table 1. As shown in Table 1, the narrower the distance between the cores of the upper and lower rolled heaters, the greater the difference between the temperature rise and the temperature rise, and the overlap of the rolled heaters. The larger the part, the larger the difference between the heating amount and the heating amount. Further, as shown in Fig. 14, the three rolling stock heaters (BH1 to 3) are respectively moved to the WS (work side) side or the DS (Drive Side) side. Sections 17(a) to (e) show the state in which the width of the rolling stock heater corresponding to each of the heating tests a to e is shifted. The "heating amount" of the rolled heater in Table 1 is the difference between the lowest temperatures in the width direction of the sheet before and after the temperature rise as shown in Fig. 15(a). In the same manner, as shown in Fig. 15(b), the "heating amount difference" in Table 1 is the difference between the temperature rise amount of the center of the steel sheet in the width direction of the steel sheet and the temperature rise amount 15 from the end portion of the steel sheet to the position of 150 mm. 50 20 1261000 [: Table 1] Movement amount (_) BH overlap amount (_) Heating amount (X) Heating temperature difference (t:) a BH 1210 3H1-0 BH.1 ~ BH3 All: 300 37 6 board鉄 鉄 2 2160 BH2-WS150 BH1 and Book 2: 150 44 7 900 (smi) 3130 BH3 = DSL50 BH1 and leg 3: 150 48 8 mm EH - - h BH 1210 : MU ~ off 3 all: 600 41 26 Board width 鉄 inter-heart distance @160 0H2-O: Both legs 1 and 2: 0 0κ> 1200 {mm) 3130 BH3-0 丨ΒΗ1^·ΒΗ3 Both: 0 52 40 _ EH One::: : Fiber 1210 Leg 1:0 ΒΗ1~ Leg 3 All: 300 34 Plate width 鉄 inter-heart distance 2160 BH2-WS150 BHi and leg 2 both;: 150 39 47 1500 (ΠΗΒ) 3130 BH3^DS150 Leg 1 and leg 3 :150 40 54 mm — » ::1:. d BH 1210 1:0 BH1~leg 3 all: 0 V ; SI; ';· '· 29 Plate width msiSL away from 2160 BH2=WS300 Off 1 and BH2: 300 34 34 1800 (mm) 3130 BH3-DS300 BH1 and off 3: 300 36 37 JB01 EH - - .. e Leg Φ210 BH1-0 BH1 ~ BH3 All: 300 37 8 Board width ( distance (2) 160 BH2 -WS150 Both 1 and BH2: 150 44 7 900 (m m) 3130 BH3-DS150 Both BH1 and BH3: 150 48 8 um ::-- 30 . .-...

Figure 16 shows the heating amount of the four types of steel plates heated by the rolling mill heater (the distance between the cores of the rolling mill heaters is 210 mm), and the amount of heating of the rolled stock heaters before the finishing mill (B Η heating amount) The result of comparison with the temperature distribution of the width direction of the plate on the exit side of the finishing mill (comparison of heating of the rolled heater). As shown in Fig. 16 of Fig. 1261000, the steel plates after the rough rolling have the temperature deviation of the letter Μ type indicated by the broken line, but the temperature distribution of the three hot-rolled heaters is increased by the thin solid line. The amount is raised. As a result, the temperature distribution in the width direction of the steel sheet is almost uniform as in the case of a thick solid line. 5 After the steel sheet having the temperature distribution in the width direction is subjected to finish rolling, a hot-rolled steel sheet having uniform material properties in the width direction of the steel sheet can be obtained. According to the present invention, since any region in the width direction of the temperature-increasing steel sheet can be heated, the temperature distribution in the width direction of the steel sheet (rough-rolled product) can be made uniform during hot rolling, and as a result, the material properties in the width direction of the hot-rolled steel sheet can be made uniform. . In addition, it is also possible to deliberately make the steel sheet (rough-rolled) have a different temperature distribution in the width direction, and it is possible to obtain a special steel sheet having different material properties in the width direction after hot rolling. (Example 3) A flat steel sheet having a thickness of 250 mm and a width of 1250 mm heated to 1200 ° C in a heating furnace was subjected to rough rolling to obtain a rough rolled product having a thickness of 30 mm. Then, as shown in Fig. 18, the rough-rolling 15 pieces are collectively heated in the width direction of the rough-rolled piece by the AC-type induction heating device 123 having a wider width than the rough-rolled piece 104, and further, the width is thicker. The AC type induction heating device 124 having a narrow rolled product 104 performs concentrated heating at the center portion, and the end heater 106 performs concentrated heating of the ends. Then, finish rolling was performed by a finishing mill to produce a hot rolled steel sheet having a thickness of 2 mm and a width of 1250 mm. At this time, the finishing rolling speed is 1000 m/min. In order to ensure that the target temperature at the exit side of the finishing rolling is 860 ° C, the temperature at the inlet side of the finishing rolling must be ll 〇〇 ° C. The temperature distribution at the inlet side temperature of the finish rolling varies depending on the temperature distribution in the width direction and the decrease in the heat dissipation in the long direction. This temperature is reduced by two AC-type 1261000 conduction heating devices and end heater compensation. As shown in Fig. 20, according to the entrance side width direction thermometer, the temperature distribution before the heating of the front end of the roughed piece is 1080 °C at the center, 1100 °C at the highest point, and the coldest point at the end is l〇40. °C. The AC heating device with a narrow width induces a maximum heating temperature of 20 ° C (128) in the central portion to solve the temperature deviation at the center, and the end heater is used to raise the temperature centrally by 6 (TC (129). Therefore, the temperature distribution in the width direction before rolling can be made uniform. Further, as shown in Fig. 21, in the middle portion of the rough-rolled product, the entire temperature is lowered due to heat dissipation, and the temperature is increased according to the entrance side width direction thermometer. The temperature distribution is 1060 ° C in the central part, 1100 ° C in the highest point, and 1000 ° C in the coldest point at the end. The maximum heating temperature of the central part is 20 ° C ( 128 ) To solve the temperature deviation in the central part, the central temperature is increased by 20 ° C by a wide-width alternating induction heating device, and the end portion is heated by 40 ° C (130). Further, the end portion is concentrated by the end heater. 15 The temperature rises to 40 ° C ( 131 ). Thereby, the temperature distribution in the width direction before rolling can be made uniform. Further, as shown in Fig. 22(a), at the end after the rough rolling, the temperature will be due to heat dissipation. Further drop, according to the inlet side width direction thermometer, heating The temperature distribution is 10 °C at the center, 1060 °C at the highest point, and 1000 °C at the end of the 20th. The AC-type induction heating device with a narrow width heats the central portion up to 20 °C. (128), to solve the temperature deviation in the central part, the central temperature is increased by 40 °C by a wide-width alternating induction heating device, and the end portion is heated by 80 ° C (132). Further, the end heater is used to end The temperature is increased by 20 °C (133). This makes it possible to evenly distribute the temperature in the width direction of the pre-rolling by l26l〇〇〇. The front end, the middle part, and the temperature are 1100°c, and the material in the length direction of the finish rolling (delay rate) The difference is the total width of the rear end of the steel plate with a small dispersion and the temperature of the inlet side of the rough rolling is 860 ° C, and the width direction and 10 are obtained, that is, the temperature difference at the exit side of the finishing rolling and the strength of the steel sheet after finishing rolling are obtained. Relationship date of 8 ^• As shown in the figure 22(b), when the temperature difference at the exit side of the finishing pass is 2 ,, the deviation of the strength TS is 10%. Therefore, in the method for heating the end portion in the past, due to the rough rolling The temperature of the central low temperature part is lower than the average temperature in the width direction by Μ °C, so the steel plate is obtained. In the present invention, since the temperature difference in the width direction of the finish rolling outlet side is almost 3t, the material of the width direction of the steel sheet is obtained. The characteristic deviation is 丨·5% and the material is uniform.

According to the hot rolling method of the present invention, the following remarkable effects can be obtained, that is, the temperature distribution in the width direction of the rough-rolled product before the finish rolling can be made uniform, and the material properties such as the mechanical property in the width direction after the finish can be obtained. Dispersed hot sheet steel. Further, according to the hot rolling apparatus of the present invention, the temperature distribution in the width direction can be made uniform by selectively heating the central low temperature portion of the roughened product before the temperature rise finishing. (Example 4)

The AC-type induction heating device 204 for inducing the entire width direction of the heated rough-rolled product shown in Fig. 23 is disposed between the roughing mill 2〇1 and the finishing mill 2〇2, and induces the front end portion of the rough rolling member. Heating is performed by heating to lower the temperature of the lower portion of the temperature, thereby reviewing the reduction in the amount of cutting of the material of the rough-rolled product. The AC type attracting 54 1261000 disposed between the roughing mill 202 and the finishing stock 2 〇 3 is arranged in this order and in the reverse order, and the two are reviewed. . The rough rolled piece has a thickness of 3 mm. The front end portion 213 of the rough rolling member 201 passes through the iron 5 to the interval when the heating device 2〇4 is induced, so that even if the rough rolling member 201 is warped, the heating temperature increase amount 24a of the scraping end portion 13 of the mm rough rolling member can be stably passed. Then as shown in Figure 4, the actual =. The normal portion and the rear end portion 214 of the roughened product 2〇1 are narrowed by a core interval of 13 Gmm when the heating device 204 is induced, and as a result, the heating temperature increase amount 224b of the rear end portion of the rough rolling member is as shown by the broken line in FIG. . 1) Regarding the rough-rolled product tip end portion 213 and the rear end portion 214, the reference point 217 in the longitudinal direction of the roughing member is as shown in the 27th (4)th (8th), and the distance from the position of the fishtail portion 216 to the provincial reference point 217 is " The distance from the reference point." In Fig. 28, the axis is the distance from the reference point, the vertical axis is the temperature of the rough-rolled part 1, and (a) shows the condition of the front end portion 213 of the rough-rolled piece, (... shows the rough-rolled 15 piece rear end portion 214 The position of the cutting position of the material cutting machine is determined based on the average value χ and the standard deviation σ of the rough rolling stock temperature before the finish rolling in the cutting position, and the front end portion 213 of the rough rolling piece is Χ-2σ. The cutting is performed at the position of l〇l〇t:, and the rear end 邛214 of the rough rolling piece is cut at a position where χ_2σ is 924 ° C. The reason why the front end portion 213 has a higher temperature of 20 is In the finish rolling, the problem that the low-temperature part of the rough-rolled part will be broken is serious in the front part of the rough-rolled part. First, the rough-rolled rough-rolled part is first heated by the alternating-type induction heating device, and then cut by the material head. The case of cutting off the head piece by the cutting machine. Fig. 2 8 (a) shows the coarse 55 126100 ο Μ 图 , 附近 附近 附近 附近 附近 附近 附近 附近 附近 附近 附近 附近 附近 附近 附近 附近 附近 附近 附近 55 55 55 55 55 55 55 55 55 55 55 55 55 55 The temperature profile of the roughing stock before finish rolling near the end 2i4. In the figure, when induction heating is not performed. When induction heating is performed. . The rough-rolled product tip end portion 213' is cut at the position of 粗_2"ι〇ι〇5 of the roughing member temperature. As shown in Fig. 28', when induction heating is not performed, it is 171 mm from the reference point 2Π. The cutting position 19 is performed, and (4) When the induction heating is performed, the cutting position 218-1 of the ιΐ3_ is cut off from the reference point 217. The cutting was performed at the position of 粗·2_924 10 C at the temperature of the rough rolling stock. As shown in Fig. 28(b), the induction heating was not performed, and the cutting was performed at the cutting position 219a which was 87 mm from the reference point 217. In contrast, when the induction heating is performed, the reference point 217 is also heated up to Χ-2σ of the roughing member and the temperature is 924 C. Therefore, the cutting position of 12 mm is calculated from the reference point 217. 218a, that is, the cutting is performed at a position close to the reference point 15 of the shape defect portion. Then, the rough-rolled rough-rolled product is first cut by the material cutting machine and the head piece, and then induced by the alternating current type. When the heating device is heated, the front end portion 213 of the rough rolling member is cut off from the reference point 217 by a cutting position 218-2 of 15 mm. After the head, the temperature of the rough rolling before the rough rolling in the induction heating is 20 in the same manner as described above in the figure 28(a). Since the cutting is completed at the time of induction heating, the reference point 217 is used. From the cut position 218·2 of 15111〇1, a sufficient temperature rise amount can be obtained (250. 〇, the result is at the cut position 218-2 of 15 mm, and the χ_2σ of the rough rolling piece temperature is 1010X: Therefore, it can be almost The cutting is performed at a position close to the reference portion 217 of the defective portion. 56 1261000 Further, in the first case of the end portion 214 of the rough-rolled product, the material is cut after the induction heating, the tangential portion is already sufficiently The amount of temperature rise is the same as that of induction heating after the cutting of the material head, and a sufficient temperature rise amount can be obtained. In the same manner as in the first case, the cutting can be performed at a cutting position 218a of 12 mm from the reference point. According to the present invention, an alternating type induction heating device for inducing heating of the entire width direction of the rough rolling member is disposed between the roughing mill and the finishing mill to heat the rough rolling member, so that it is not necessary to stop the rough rolling member during heating. And don't need huge equipment By investing, the temperature at the lower end portion and the lower end portion of the rough-rolled part can be sufficiently increased, and the amount of cutting of the rough-rolled material can be reduced. [Simple description of the ring] Simple drawing BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a conventional continuous hot rolling apparatus. 15 Fig. 2 is a schematic view showing a conventional annular rolling apparatus. Fig. 3 is a flat steel embryo which is heated by a heating furnace. The (4) of the temperature distribution in the width direction is shown in the lower part of the flat sheet of the flat steel sheet, and (8) is shown in the lower part of the width direction of the flat steel sheet.

Fig. 4 is a graph showing the temperature distribution in the width direction of the steel sheet after rough rolling and after finish rolling, (4) showing (four) pieces, and (8) showing the width direction after the rough rolling / the degree of the cloth knives '(e) shows A diagram of the temperature distribution in the width direction after finish rolling. Figure 5 shows the temperature distribution in the width direction of the steel sheet after the refinement, (4) shows the flat steel embryo, (Μ总# — () shows the rough rolled piece, and (c) shows the finished steel plate 57 1261000 The temperature distribution diagram in the width direction. Fig. 6 shows the temperature distribution in the width direction after the end portions of the coarse and rare crucibles are twisted by the end heaters. b) shows the temperature distribution of the rough-rolled parts heated by the end heating machine and the width direction of the 5th plate.) The figure 7 of the steel after the finishing is not shown, and the electromagnetic induction heating device (4) Temperature profile in the width direction after heating and hot rolling, (4), showing flat steel, (8)

The rough-rolled piece heated by the end heating machine is shown, and (4) shows the temperature profile in the width direction of the steel plate after finish rolling. 10 Fig. 8 is a view showing an alternating type induction heating device. Fig. 9 is a view showing an example of an AC type induction heating device, (4) an example of three AC type induction heating devices having the same core width, and (8) an example of two AC type induction heating devices having different core widths. . Fig. 10 (a) to (e) are diagrams showing the temperature distribution in the width direction when the heating means is induced by the three alternating current type 15 having the same core width.

Figure 11 (a) shows the relationship between the hot rolling temperature of the 600 MPa high tensile steel sheet and the hole expansion ratio (%), and the 11 (b) shows the hot rolling temperature of the 6 MPa high tensile steel sheet ( °C) and tensile EL (° / 〇) diagram. Fig. 12(a) to (e) are diagrams showing the pattern of the temperature rise in the width direction when the plurality of rolled heaters are moved in the width direction of the 20 steel sheets. Fig. 13 Fig. 13(a)(b) The temperature rise distribution in the width direction when the rolled heater is heated and the temperature deviation in the width direction of the steel sheet are improved. Fig. 14 is a view showing the movement of the width of the rolling stock heater in the embodiment of the movement of 58 1261000. Fig. 15 (a) and (b) are drawings for explaining the difference between the temperature rise amount and the temperature rise amount when the workpiece heater is heated in the embodiment. Fig. 16(4) to (4) show the temperature in the reverse width direction of the steel in the embodiment. Fig. 17 is a view showing a state of movement in the width direction corresponding to the heating test of (4) to (4) in the examples. Fig. 18 is a view showing an example of two AC type induction heating devices having different core widths. Ϊ́θ Μ9® shows the temperature rise distribution of the AC induction heating device and the end heater, (4) shows the temperature rise distribution of the AC induction heating device with a narrow width' (b) shows the AC type induction heating with a wide width The temperature rise distribution of the device, (c) shows the total temperature rise distribution of the two AC induction heating devices, and (d) shows the temperature rise distribution of the heaters. 15 Fig. 2 is a diagram showing the temperature distribution before rolling of the front end portion of the rolled product. Fig. 21 is a view showing the temperature distribution before rolling in the intermediate portion of the rough rolling member. Fig. 22(a) is a view showing the temperature distribution before rolling of the rear end portion of the roughed product. Fig. 22(b) is a graph showing the relationship between the temperature difference at the inlet side of the finish rolling and the difference in the stretch ratio of the finish rolled steel sheet. Fig. 23 is a perspective view showing the AC type induction heating device of the present invention. 59 1261000 Figure 24(a)(b) shows a schematic view of the configuration of the hot rolling equipment of the present invention. Fig. 25(a)(b) is a perspective view showing the state of the induced current of the T-thick rolled product when the AC type induction heating device is used, (8) shows the state near the foremost end portion of the roughened product, and (b) shows Display the normal part (middle part) 5 The picture of the condition. Fig. 26 is a view showing the temperature rise in the vicinity of the front and rear end portions of the rough-rolled product when the AC-type induction heating device is used. Fig. 27(8) shows the front end of the roughed piece, and the figure (8) shows the cut portion near the rear end. Fig. 28 shows the presence or absence of the AC type induction heating device. The graph of the temperature of the rough-rolled part near the end, (4) shows the temperature of the front end of the rough milk, and (b) shows the temperature of the rear end of the roughed part. Figure 29 shows the electromagnetic induction heating device of the past. Fig. 30 is a diagram showing the heating of a flat steel embryo in a heating furnace, and the temperature in the width direction of the flat steel embryo is asymmetrical. Fig. 31 is a flat steel embryo which is reheated by a heating furnace. The graph of the temperature distribution in the width direction, (4) is shown in the figure of the immortal embryo, and the part having the low temperature portion (8) shows that the temperature distribution in the width direction of the flat steel is asymmetric, and the low temperature portion is present in the central portion in the width direction. 20 Fig. 32 is a graph showing the temperature distribution in the width direction of the steel sheet after rough rolling and after finish rolling, and (a) shows the temperature distribution in the width direction of the right asymmetry of the rough rolled piece, and the temperature in the width direction of the asymmetry. Distribution map. '(b) shows the left after rough rolling (c The system shows that the left and right after the finish rolling, the 33rd figure shows the temperature profile of the width direction of the rough rolled piece by the induction of the movement in the width direction and the heating by 60 1261000, and (a) the flat steel The temperature distribution map in the width direction of the embryo, (b) shows the temperature distribution in the width direction of the rough-rolled piece which causes the induction heating device to move in the width direction. (c) shows the temperature distribution in the width direction of the steel sheet after finish rolling. 5 Section 34(a)(b) shows the relationship between the distance between the alternating-type induction heating device and the temperature change when the pitch is changed. Figure 35 shows the tiltable AC type with two core widths on the rolling line. Fig. 36 shows the temperature rise distribution diagram of the AC induction heating device, (a) 10 shows the temperature rise distribution of the AC induction heating device with a narrow width, and (b) shows the wide width communication. The temperature rise distribution of the induction heating device is shown, and (c) shows the total temperature rise distribution of the two AC induction heating devices. Fig. 37(a)(b) is a view showing the tilting device of the AC induction heating device. 38 is a diagram for controlling the amount of temperature rise in the width direction of the AC induction heating device, and (a) shows an example in which a plurality of AC induction heating devices arranged side by side in the width direction are respectively raised and lowered, and (b) shows that The core of the AC-type induction heating device is divided into a plurality of cores in the width direction of the plate, and the cores are lifted and lowered, and (c) shows the heating and heating amount of the AC-type 20-lead heating device that controls a plurality of parallel-line-direction heating devices. For example, (d) is a diagram showing an example in which a shielding plate for changing a magnetic flux is provided between an alternating current type induction heating device and a roughing member. [The main components of the drawing represent a symbol table] 1...heating furnace 2 ... flat steel embryo 61 1261000 3... rough rolling mill 14... high temperature part 4... rough rolling part 15... cold part 5... cutting head machine 16... heating amount 6.. End heater 17...heating amount 7...continuous finishing mill 18·.iron core...cooling station 19...coil 9...reel 20...AC type induction heating device 10 ...winding 匣21...steel plate 11...joining and cutting machine 22...inlet side width direction thermometer 12...soldering device 23...AC type induction heating device 13. . Low temperature part 24. AC type induction force σ heat device 125... outlet side width direction thermometer 25... AC type induction heating device 126... temperature rise 26... outlet side width direction thermometer 127···heating 27...Induction heating device 128...heating 28...heating 129...heating 29...heating 130...heating 30...heating 131...heating 104···roughing piece 132.. Heating temperature 106...end heater 133...heating 116...heating 201.·rough rolling stock 122...inlet side width direction thermometer 202...roughing mill 123...AC type induction heating device 203...fine Rolling mill 124...AC type induction heating device 204...AC type induction heating device 62 1261000 205a...iron core 205b...core 206.. coil 207..heating furnace 208··.cutting machine 209 . . . winding device 211a...vertical portion 211b...vertical portion 212···horizontal portion 213.. front end portion 214···rear end portion 215...shape defective portion 216.. fishtail valley portion 217 .. .. Reference point 218.. Cut position 218a... Cut position 218-1... Cut position 218-2... Cut position 219.. Cut position 219a·.· Cut position 21 %...cut position 222.··Induction current 223 .. . the most front end portion 231.. electromagnetic induction heating device 232 ... coil 233a ... core 233b ... core 302.. flat steel 304 · · rough rolling 306.. end heater 307.. .Extension side width direction thermometer 313.. Pre-tropical zone 314.. Heating zone 315.. .. Tropical zone 316...High temperature section 317···Low temperature section 318.. Cooling part 319.. Amount 320.. AC type induction heating device 321.. tilting 322... iron core 324.. AC type induction heating device 325.. AC type induction heating device 326.. inlet side width direction thermometer 327.. Side width direction thermometer 328...Support 329...Axis 330···Elevator

63 1261000 331···Elevator 332...shading plate 333···lift

Claims (1)

1261000 8. A hot rolling apparatus for a steel sheet, wherein a heating device for changing the temperature rise amount of the rolled material in the width direction of the rolled material is disposed on the inlet side of the roughing mill in the rolling line, between the roughing mill and the roughing mill, and the roughing mill Between the finishing mill or between the finishing mill and the finishing mill. 5. The hot rolling apparatus for a steel sheet according to item 8 of the patent application, wherein the heating apparatus heats the temperature rise of at least the central portion in the width direction of the rolled material to be two in a direction from the center portion and the width of the sheet. The amount of temperature rise in the middle portion between the ends is large. 10. The hot rolling apparatus for a steel sheet according to Item 8 or Item 9 of the patent application, wherein the heating means for heating the temperature rise of both ends of the rolled material in the sheet width direction is intermediate to the width direction of the sheet The part of the Ministry of Heating is large. 11. The hot rolling apparatus for steel sheets according to item 8 of the patent application is provided with: a heating device for changing the amount of temperature rise in the direction of the width of the rolled material, and heating only the rough-rolled rough-rolled parts The central low temperature part; and the 15th end heater are used to heat the low temperature parts at both ends of the rough rolled piece. 12. The hot rolling apparatus for steel sheets according to item 8 of the patent application is placed on the inlet side of the finishing mill, and is provided with: a heating device for heating the amount of temperature increase in the direction of the width of the rolled material; 20 one end portion The heater is used to heat the low temperature portion of the both ends of the rough rolled piece; and a temperature mastering device is used to grasp the temperature distribution in the width direction of the rough rolled piece; and, in addition, a: 66 1261000 a determining device, The maximum value of the temperature in the width direction grasped by the temperature mastering device is used as the reference temperature, and the difference between the temperature at each point in the width direction and the reference temperature is obtained, and the temperature rise amount at each point is determined based on the temperature difference so that the temperature in the width direction is The predetermined temperature distribution; and 5 - the control device is configured to operate the heating device and the end heating device based on the temperature increase amount to uniformize the temperature distribution in the width direction of the rough rolling member. 13. The hot rolling apparatus for steel sheets according to item 8 of the patent application, wherein the heating means is disposed at least two or more along the rolling line. 14. The hot rolling apparatus for a steel sheet according to item 8 of the patent application, wherein the heating apparatus 10 is an alternating current type induction heating device capable of changing a temperature rise amount in a sheet width direction of the rolled material. 15. The hot rolling apparatus for a steel sheet according to item 14 of the patent application, wherein the alternating type induction heating device is an alternating type induction heating device having at least two or more widths in a width direction. 15 16. A hot rolling mill for steel sheets in which the material properties in the width direction are not dispersed is a heating device for steel sheets having a flat steel billet heating furnace, a rough rolling mill, and a finishing mill, and includes: an alternating current type induction heating device It can only heat the central part of the steel plate; and an AC-type induction heating device can heat the full width of the steel plate, and the temperature rise of the end portion 20 can be heated to be larger than the central portion. 17. A hot rolling apparatus for a steel sheet in which the material characteristics in the width direction of the patent application range 16 is not dispersed, wherein at least one of the AC type induction heating devices capable of heating only the central portion of the steel sheet has a core width of 400 to 700 mm. In the range of the heating plate, the temperature of the heating plate can be heated to a height of at least one of the 67 1261000 AC type induction heating devices which is larger than the central portion, and the width of the core is in the range of 800 to 2500 mm. 18. A hot rolling equipment arrangement between a roughing mill and a finishing mill, in turn arranged with an AC-type induction heating device 5 for inducing the entire width direction of the heated rough-rolled part and for cutting the length direction of the rough-rolled part The cutting machine of the front piece at the front end. 19. A hot rolling equipment arrangement between a roughing mill and a finishing mill, which in turn is arranged with a cutter for cutting the tip end of the front and rear ends of the roughing section and for inducing heating of the roughened section The alternating type induction heating 10 device in the width direction. 20. A hot rolling method using a hot rolling apparatus having a hot rolling equipment configuration as claimed in claim 18 or 19, and heating one of the front and rear ends of the rough rolled piece by the aforementioned alternating type induction heating means or The ends of the two sides are at least lm below. 15. The hot rolling method according to claim 20, wherein the temperature of the low temperature in one or both of the front and rear ends of the roughed product is increased by heating, thereby obtaining a rough-rolled product. The amount of material cut off is reduced. 22. A hot plate device for a steel plate, comprising a heating furnace for heating a flat steel blank, a rough rolling mill for rough rolling a flat steel blank, and a finishing mill for finishing a rough rolled rolled product 20 The utility model is characterized in that an alternating type induction heating device for increasing the temperature rise of the central portion of the steel plate is provided between the roughing mill and the finishing mill, and is used for inducing the upper or lower surface or the two alternating current types. The heating device tilts the tilting device in the width direction of the rolling line. 23. A hot rolling mill for steel sheets, which is provided with a heating mill for heating a flat steel billet, a 1261,000 furnace, a roughing mill for rough rolling flat steel, and a finishing mill for finishing rough rolling and rough rolling. Between the roughing mill and the finishing mill, a plurality of AC-type induction heating devices are arranged along the width direction of the rolling line, and the output of each AC-type induction heating device can be adjusted. 5 whole device. 24. A hot rolling apparatus for a steel sheet, comprising a heating furnace for heating a flat steel billet, a roughing mill for rough rolling a flat steel blank, and a finishing mill for finishing a rough rolled rough rolled product, The utility model is characterized in that an alternating-type induction heating device is arranged between the roughing mill and the finishing mill, and an inaccessible shielding body for changing the magnetic flux of the alternating-current induction heating device in the width direction of the rolling line is provided. . 69