JP2011115798A - Method of manufacturing unequal angle steel having unequal thickness, cooling water jetting conveying roller table and cooling bed which are used for manufacturing it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing an unequal angle steel having unequal thickness, by which better rolling is performed while unnecessitating a forced water cooling stage which is performed at the front and rear of an intermediate rolling mill IM and the front of a finishing rolling mill FM by continuosly arranging the mills. <P>SOLUTION: The method includes: a continuous rolling stage 1 where an unequal leg / unequal thickness rolled stock heated with a heating furnace RF is finally formed into an unequal leg / unequal thickness rolled stock having a nearly dog-leg-shaped cross section by making the continuous rolling of one roll, one way and one pass by the tandem arrangement of a roughing rolling mill IM, the intermediate rolling mill IM and the finishing rolling mill FM in tandem; a water cooling stage 2 where cooling is performed by jetting water to the surface and back face of the minor side A2 of the unequal leg / unequal thickness rolled stock; a bow delivering stage 3 where the unequal angle steel having unequal thickness A is delivered to the upside of the floor frame of the cooling bed CB so that the middle part in the longitudinal direction is expanded to the side of the minor side into a hack shape; a mist jetting and cooling stage 4 where the unequal angl steel having unequal thickness is further cooled by jetting the mist; and a roller straightening stage 5 where the roller straightening RS of the unequal angle steel having unequal thickness A is performed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method of manufacturing a long and asymmetric long and unequal thick angle steel having a short side and a thin long side formed into a U-shape. Moreover, this invention relates to the cooling water injection conveyance roller table used for manufacture of the said unequal side unequal thickness steel, and a cooling floor.

  Unequal unequal thickness steel is mainly used for shipbuilding, bridges, vehicles, and the like. As shown in FIG. 12, the rolling process of a general conventional unequal unequal thickness steel is performed by using a rolling mill BD, a reversible coarse rolling mill RM, and an intermediate rolling material heated in a heating furnace RF. Each roll of the rolling mill IM is rolled through several passes by reciprocating movements, and finally formed into unequal side unequal thick angle steel with a predetermined shape dimension by a finish rolling mill FM, and further, a water cooling device WT, a product It is conveyed to the cooling bed CB by the infeed transfer carriage TF. As described above, since the rough rolling mill RM and the intermediate rolling mill IM are reversible, they are rolled through five or seven passes while moving the unequal side unequal thick angle steel rolled material. It is an absolute condition that forced rolling water cooling is performed by directing the short side by a plurality of nozzles mounted on the side surface and the lower surface of the side guide while restraining the rolled material with the side guide for each pass. (For example, Patent Document 1).

JP 63-248509 A

  In the rolling process of the unequal side unequal thick angle steel according to the prior art, as described above, the intermediate rolling mill IM is a reversible type, so the short side of the unequal side unequal thickness mountain steel is directed to the short side. Forced water cooling is required before and after the intermediate rolling mill IM and before the finishing mill FM. Moreover, there are problems such as requiring a large amount of expenses for the equipment and a large running cost during operation. There is also a problem that the manufacturing time is increased. Furthermore, after being taken into the cooling bed CB, the long side wavy phenomenon that occurs during the cooling process of the unequal side unequal thick angle steel and the long side wavy phenomenon that occurs when the bend generated during the cooling process is corrected by the roller. There is a problem that occurs.

  The present invention has been made in view of the above circumstances. By adopting a continuous rolling mill arrangement, the forced water cooling process performed on the front and rear surfaces of the intermediate rolling mill IM and the front surface of the finishing mill FM is not required. However, the present invention also provides a method for producing unequal side unequal thick angle steel that can perform better rolling. Moreover, the cooling water injection conveyance roller table used for manufacture of the said unequal side unequal thickness angle steel, and a cooling floor are provided.

  As a means for this, the invention of claim 1 is characterized in that the material heated in the heating furnace is made of a rough rolling mill, an intermediate rolling mill, and a finishing rolling mill as continuous rolling of one roll, one direction and one pass in a skewer arrangement. A continuous rolling process for finally forming a substantially U-shaped unequal side unequal thickness rolled material, and water is sprayed on the front and back surfaces of the short side while the unequal side unequal thickness rolled material is transferred straight in the longitudinal direction. A water cooling step for cooling and a non-equal thickness unequal thickness angle steel conveyed after the water cooling step to a top surface of a cooling floor in a direction substantially perpendicular to the longitudinal direction. An arch-shaped feed step that is sent out in an arcuate shape toward the side, and an unequal side unequal thickness angle steel that has been sent out by the bow-shaped feed step and is naturally allowed to cool on the upper surface of the floor pier is further cooled. The mist injection cooling process and the mist injection cooling process are finished. There equilateral unequal thickness angle steel and a roller straightening step of roller straightening, where having a.

  According to a second aspect of the present invention, the water-cooling step is such that the unequal side unequal thickness chevron is shaped like a square and is placed on the oblique conveyance roller and conveyed, and the short side is always in close contact with the vertical roller. This is a step of cooling by spraying water on at least the front and back surfaces of the short side while maintaining the posture.

  According to a third aspect of the present invention, the bow-shaped feeding step is provided in a plurality of product feeding and transporting carriages that are independently controlled in speed between a plurality of parallelly arranged floor rails that constitute the cooling floor and that are movable back and forth. The movable claw is a step of advancing so that the short side direction side of the central portion in the longitudinal direction of the unequal side unequal thickness chevron swells backward in an arcuate shape.

  According to a fourth aspect of the present invention, the mist injection cooling step is a step of injecting mist-like water over the entire lower surface and the entire length of the unequal side unequal thickness angle steel on the upper surface of the floor rail of the cooling floor for a predetermined time. It is to be.

  The invention of claim 5 is a cooling water jetting and conveying roller table used in a water cooling step in the method for producing unequal sides and unequal thickness irons, in order to assist in conveying the unequal sides and unequal thickness irons. A fixed plate that is disposed at an angle so that the traveling direction side of the unequal side unequal thickness steel that proceeds in a U-shape is slightly elevated, with an appropriate gap therebetween. A rotating vertical roller provided at appropriate intervals along a side edge in one direction of the fixed plate, and a short side of the unequal side unequal thickness iron near the side of the vertical roller. In order for the equal thickness angle steel to be conveyed in the traveling direction, the rotation axis is inclined with respect to the traveling direction and is slightly higher than the upper surface of the stationary plate. Rotating driveable slant arranged in the gap A lower arrangement having a short side back surface injection nozzle that cools the back surface of the short side of the unequal side unequal thickness iron by injecting cooling water obliquely upward from below the gap between the transport roller and the fixed plate. A water pipe, a side water pipe having a short-side surface spray nozzle that cools the surface of the short side by spraying cooling water in a substantially horizontal direction from the upper side of the fixed plate on the vertical roller side, and the fixed plate An upper water pipe having a long-side surface injection nozzle for injecting cooling water from above toward the long side of the unequal side thickness steel and cooling the surface of the long side. It is an ejection transport roller table.

  In the invention of claim 6, the short side back surface injection nozzle, the short side surface injection nozzle, and the long side surface injection nozzle can each adjust the angle of the cooling water injection direction, and the lower water distribution pipe, The side water distribution pipe and the upper water distribution pipe are a cooling water jetting and conveying roller table characterized in that the amount and the water pressure of the cooling water inside each can be adjusted.

  The invention of claim 7 is a cooling bed used in an arcuate feeding step and a mist spray cooling step in a method for producing an unequal side unequal thickness angle steel, and a direction perpendicular to the longitudinal direction of the unequal side unequal thickness angle steel. And a plurality of floor rails laid between the floor rails with appropriate gaps between them, and can be independently driven in the front-rear direction along the floor rails. A product feed carriage, and a movable claw rotatably fixed to each of the product feed transport carriages and capable of protruding and retracting above the floor rails through the gap between the floor rails, In the case of moving from one end of the floor rail to the other end, the product feeding carriage located at the center of the unequal side unequal thickness iron is the product located at both ends of the unequal side unequal thickness iron. It travels at a slower speed than the feeding carriage, and the The product feeding carriage moves the movable claws by projecting the movable claws upward from the gap between the floor rails and extruding the unequal side unequal thickness angle steel with the movable claws. When the product moves in the direction from the other end of the floor rail to the one end, the product feed carriage causes the movable claws to be immersed below the floor rail through the gap between the floor rails, respectively. It is to be.

  The invention of claim 8 is directed to a discharge pipe for injecting mist from the tip of the unequal side unequal thick angle steel at the other end of the floor rail, and a pump for supplying water to the discharge pipe through a pipe. The cooling bed further includes a drive source for rotationally driving the pump and a control panel for controlling the drive source.

  According to the invention of claim 1, since the rough rolling mill, the intermediate rolling mill, and the finishing mill are rolled in a non-uniform unequal thick angle steel material as continuous rolling in one roll and one direction in a skewer arrangement, Unlike the reversible roughing mill and the intermediate rolling mill which are reciprocated through the same machine and molded through several passes each, a forced water cooling device for cooling the short side is unnecessary. Further, since the equipment is simple, the cost is low and the maintenance is easy. In addition, the rolling pass time is shortened by continuous rolling, thereby reducing the heat radiation amount of the rolled material, and the temperature difference between the short side and the long side is reduced due to the synergistic effect of the temperature increase by one-roll one-direction one-pass continuous rolling. Therefore, the amount of bending in the hot rolling process is reduced, and a long and unequal unequal thick angle steel with a stable dimensional shape can be produced with high efficiency. Also, by adopting a flat hole type roll, the absolute value of the axial thrust generated in the rolling process due to the asymmetry of the short side and long side is made smaller than that of the conventional butterfly hole type roll, so that the physical and mechanical mechanics are reduced. Can be suppressed. Furthermore, a forced water cooling device becomes unnecessary. Further, the structure of the inlet and outlet guides of each rolling mill can have a structure having strength and rigidity corresponding to the bending of the rolling material. Furthermore, as for the water cooling in the continuous rolling process, since a general water cooling method in which only the rolling roll cooling equivalent to that of a general shape steel having a symmetric cross section can be adopted, it is possible to perform long hot rolling.

  According to the second aspect of the present invention, the unequal side unequal thickness steel material is placed on the slanted conveying roller of the cooling water jet conveying roller table and conveyed, and the short side adheres to the vertical roller. Since the steady posture is maintained in the steady conveyance path, the spray nozzle that sprays water on the front and back surfaces of the short side can always efficiently cool the front and back surfaces of the short side. As a result, the temperature distribution of the unequal unequal thickness steel is more uniform, which suppresses the amount of bending and contributes to improving the quality of the product.

  According to the invention of claim 3, the unequal unequal side thick angle steel fed to the cooling bed is sent out by the movable claw of the product feeding carriage so that the central part in the longitudinal direction swells in an arc shape toward the short side. Therefore, the central portion that swells in the short side direction contracts with the temperature decrease in the short side along with the decrease in the temperature after the transported delivery, returns to a substantially linear state, and the bending accompanying the temperature decrease is corrected. As a result, the work in the roller correction process in the final process is simplified and the appearance of defective products can be reduced.

  According to the invention of claim 4, water is sprayed over the entire length and the entire surface of the lower surface of the unequal side unequal thick angle steel that is air-cooled on the floor rail and has a short temperature difference between the short side and the long side. . In the present invention, by spraying water with fine particles, the cooling effect is improved, and the entire unequal side unequal thick angle steel can be brought closer to room temperature uniformly.

  According to the invention of claim 5, the cooling water injection conveyance table maintains the steady posture in the steady conveyance path by closely contacting the vertical rollers while conveying the unequal side irregular thickness chevron on the oblique conveyance rollers. be able to. As a result, the spray nozzle that sprays water on the front and back surfaces of the short side always efficiently cools the front and back surfaces of the short side even if they are installed at the same angle between the same unequal side unequal thick angle steel materials. Therefore, it is possible to make the temperature distribution of the unequal side unequal thick angle steel material more uniform, which contributes to the improvement of product quality.

  According to the sixth aspect of the present invention, when cooling different unequal-side unequal thick angle steels, the angle of each cooling nozzle is adjusted to make the most accurate on the short side and the long side. Can be effectively and efficiently hit. Moreover, the amount of water and the water pressure in each water pipe can be adjusted to adjust the optimum cooling degree, and a cooling water jetting conveyance table having versatility can be obtained.

  According to the invention of claim 7, when the product feed carriage moves from one end of the floor rail to the other end, the speed of the product feed carriage located at the center of the unequal side unequal thickness iron is Slower than the speed of the product feeding carts located at both ends of the unequal thick angle steel. As a result, the product feed carriage moves the unequal side unequal thick angle iron with the movable claw protruding above the floor rail such that the central portion swells in a bow shape toward the short side. The central portion that swells in the short side direction contracts as the temperature of the short side decreases and returns to a substantially linear state, and can correct the occurrence of bending accompanying the temperature decrease. This simplifies the work in the roller correction process, which is the final process, and can reduce the appearance of defective products.

  According to the invention of claim 8, since the mist is sprayed on the unequal side unequal thickness chevron, the cooling effect can be increased by fine water of particles, and the unequal side unequal thickness chevron is made more uniform and closer to room temperature. be able to.

Schematic diagram of the manufacturing process of unequal side unequal thickness angle steel of the present invention Schematic diagram of the manufacturing process of other unequal side unequal thick angle steel of the present invention Perspective view of unequal side unequal thick angle steel Conceptual diagram of the rolling process of unequal side unequal thickness angle steel when using a flat type hole mold Plan view of a cooling water jetting roller table for carrying out a water cooling process for transporting unequal thickness uneven steel Side view of FIG. YY sectional view of FIG. Illustration of feeding movement of unequal side unequal thick angle steel in the cooling floor Drive explanatory drawing of product feeding transfer cart and movable claw on cooling floor The figure which shows the generation | occurrence | production pattern of the cooling bending after sending an uneven side unequal thickness angle steel to the cooling bed Explanatory drawing of spray cooling device in cooling floor Schematic diagram of the manufacturing process of conventional unequal unequal thickness steel

  Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the manufacturing method of unequal side unequal thick angle steel according to the present invention is obtained by rolling a rolled material of unequal side unequal thickness steel A heated by a heating furnace RF into a rough rolling mill RM and an intermediate rolling mill. The continuous rolling process 1 for final forming the rolled material of the unequal side unequal thick angle steel A as the continuous rolling of the IM and the finishing mill FM as one pass in one direction and one pass in a skewer arrangement, and the continuous rolling process 1 A water cooling process 2 in which water is sprayed onto the front and back surfaces of the short side A2 of the unequal uneven thickness steel A to cool it, and the unequal uneven thickness steel A which has been transported after the water cooling process 2 and is still in a high temperature state. An arcuate delivery step 3 for sending out the central portion in the longitudinal direction toward the upper side of the cooling bed CB in a direction perpendicular to the longitudinal direction so as to bulge to the short side, and the cooling bed CB sent out by the arcuate delivery step 3 Mist is sprayed on the unequal side unequal thickness angle steel A which is naturally cooled on the top surface of A mist spraying cooling step 4 to further cooling, and a roller straightening step 5 for roller straightening the scalene unequal thickness angle steel A having been subjected to the mist jet cooling step 4 by a roller straightener RS.

As shown in FIG. 3, the unequal unequal side thick angle steel A manufactured through each of the steps 1 to 5 is a long angle steel having a substantially U-shaped cross section. The long side A1 forming the long and thin side, the short side A2 is short and thick, have thicknesses of t ₁ and t ₂ , respectively, and t ₁ ≦ 15 mm and t ₂ / t ₁ ≧ 1.2. It has a relationship. The reason for this is that when t ₁ exceeds 15 mm, the thin-walled side itself is hardly deformed, and essentially bending and wave distortion hardly occur, and t ₂ / t ₁ is less than 1.2. In this case, there is almost no difference in the cooling rate between the thin-walled piece and the thick-walled piece, and bending and wave distortion due to the difference in shrinkage are difficult to occur.

  In order to obtain such an unequal thickness unequal angle mountain steel A, the rolling mill RM, the intermediate rolling mill IM, and the finishing mill FM are set as a skewer arrangement, and a continuous rolling process 1 of one pass per one direction is performed. This continuous rolling process 1 does not require forced water cooling directed to the short side in the rolling forming process of the unequal thickness unequal angle iron, which was necessary in the conventional method, in each of the rolling mills IM and FM. This continuous rolling process 1 shortens the time of one rolling pass, so that the heat dissipation of the unequal side unequal thick angle steel A is reduced, and the long side A1 and The temperature difference between the short sides A2 is reduced. This means that the difference in cooling temperature between the long side A1 and the short side A2 is small, and therefore the amount of bending in the continuous rolling process 1 which is a hot rolling process is small, that is, the bending in the rolling process stage. The amount of generation is reduced, and the long and unequal thickness angle steel A having a stable dimensional shape can be produced with high efficiency. FIG. 4 shows a conceptual diagram of the rolling forming process of the unequal side thick angle steel A when such hot continuous rolling is performed using a flat type hole mold.

  In addition, the continuous rolling process 1 is good also as a process of FIG. That is, a continuous rolling process in which a preparation angle is formed by a reversible block mill BD, and finishing mills FM having a shaping hole mold on the rear face thereof may be arranged in a skewer form. In the case of this continuous rolling process 1, a reversing process is performed by a block mill BD, but in the reversible block mill BD, a rolling material for an unequal non-uniform pressure angle steel heated in a heating furnace is formed. This is a rolling mill that forms into a pre-start angle or a rough shape before starting, and in the rolling process with the rolling mill, the rolling material hardly bends, and even if bending occurs, the amount of bending is small. is there.

  As described above, the unequal side unequal thickness angle steel A that has undergone the continuous rolling step 1 is then conveyed to the water cooling step 2. As shown in FIGS. 5 to 7, the water cooling step 2 is performed by a cooling water jetting conveyance roller table WT. The cooling water jetting conveyance roller table WT includes an oblique conveyance roller 22 provided so that the conveyance direction of the unequal side unequal thickness angle steel A is inclined in one direction between a large number of fixed plates 21 at appropriate intervals. The vertical roller 23 provided at appropriate intervals along the side edge of the inclined fixed plate 21 on one side of the inclined side, and cooling water is sprayed in an obliquely upward direction from below the fixed plate 21 to cool the back surface of the short side A2. The surface of the short side A2 is cooled by spraying cooling water in a substantially horizontal direction from the upper side of the lower distribution pipe 241 having the short side back surface injection nozzle 24 and the fixed plate 21 on the inclined direction side of the oblique conveying roller 22. The side water distribution pipe 251 having the short side surface injection nozzle 25 and the cooling water is supplied toward the long side A1 of the unequal side unequal thickness angle steel A that moves on the oblique conveying roller 22 from above the fixed plate 21. Inject and cool It is provided with upper water pipe 261 having long sides surface injection nozzle 26. The long side surface spray nozzle 26 is not essential, and is provided as necessary.

  On the upper surface of the fixed plate 21, the unequal side unequal thickness angle steel A that is conveyed from the continuous rolling process 1 toward the cooling bed CB by the oblique conveyance roller 22 does not fall between the oblique conveyance rollers 22. And is fixed to a frame not shown in the drawing so as to be spaced apart from each other as appropriate and inclined so that the traveling direction side is slightly higher.

  The oblique conveying roller 22 has the rotating shaft 27 inclined so as to convey the unequal side irregular thickness iron A toward the traveling direction while moving toward the vertical roller 23 provided on the side edge of the fixed plate 21. The fixed plate 21 is fixed so as to be rotationally driven from between the fixed plates 21 at predetermined intervals so that the upper end thereof is slightly higher than the upper surface of the fixed plate 21. As a result, the transport direction of the unequal side unequal thick angle steel A is always constrained to be closer to one direction.

  The vertical roller 23 is responsible for preventing a hot product from being cracked, and is transported while being biased toward the one side of the fixed plate 21 by the oblique conveying roller 22. Is provided in the frame so as to be rotatable so that it can be received and guided without friction and conveyed at a fixed position.

  The short side back surface injection nozzle 24 is provided in a frame so that the water injection direction can be adjusted in a lower pipe 241 connected to a water supply source, and is transported obliquely from a gap 28 formed between adjacent fixed plates 21. Water is sprayed onto the back surface of the short side A <b> 2 of the unequal side unequal thickness iron A running on the upper surface of the roller 22 to cool it.

  The short side surface injection nozzle 25 is provided in a side water distribution pipe 251 connected to a water supply source in a frame in which the water injection direction can be adjusted, and is inclined between the table vertical side plate and the vertical roller 23 (not shown). Water is sprayed onto the surface of the short side A2 of the unequal side unequal thick angle steel A running on the upper surface of 22 to cool it.

  The long side surface spray nozzle 26 is provided on the upper water distribution pipe 261 connected to the water supply source in a frame so that the vertical spray direction of water can be adjusted, and the upper surface of the oblique transport roller 22 is formed from above the oblique transport roller 22. Water is sprayed onto the long side A1 of the traveling unequal side unequal thick angle steel A to cool it.

  In such a cooling water injection conveyance roller table WT, cooling water is injected from the front and back surfaces to the short side A2 on the thick side of the unequal side unequal thickness angle steel A and from the front side to the long side A1 on the thin side. By injecting only the cooling water, the short side A2 on the thick side is cooled more than the long side A1 on the thin side, and then the unequal side unequal thick angle steel A is sent to the cooling bed CB. In addition, since it is for cooling more short sides A2 here, injection of the cooling water to long side A1 is not necessarily required. In this way, the cooling water can be accurately jetted and cooled from the jet nozzles 24, 25, 26 to the respective surfaces of the short side A2 and the long side A1 of the unequal side unequal thick angle steel A. The short side A2 of the unequal side unequal thick angle steel A that is placed on the oblique conveying roller 22 and travels on the mold is always pushed to the vertical roller 23 side by the oblique conveying roller 22, so that the fixed position is constant. This is because the position is determined by being conveyed in the posture. When cooling different sizes of unequal side unequal thick angle steel A, the angle in the injection direction of each of the injection nozzles 24, 25, 26 is adjusted to be the most on each surface of the short side A2 and the long side A1. In addition to being effective and efficient, it has the versatility to adjust the amount of cooling by adjusting the amount and pressure of water in each distribution pipe 241, 251, 261. ing.

  The unequal side unequal thickness angle steel A conveyed from the cooling water jetting conveyance roller table WT onto the product feeding and transporting carriage TF at one end of the cooling bed CB is changed in its conveying direction to a right angle in this state. Then, it is conveyed in the direction of the mist injection cooling process 4 on the other end side of the cooling bed CB. The cooling floor CB is formed by laying a large number of floor bars 31 at a predetermined interval in a direction perpendicular to the fed unequal side unequal thickness steel A, and the product feed carriage TF is formed of the floor bars 31. They are installed so that they can be controlled independently. Specifically, as shown in FIG. 8 and FIG. 9, the upper surface of the cooling floor CB, that is, the floor rail, is fixed between the floor rails 31 so as to be freely pivoted to the product feeding / transfer carriage TF during the interval between the floor rails 31. A movable claw 32 that can be moved up and down above 31, a drive chain 33 that moves the product feed / transfer carriage TF in the front-rear direction of the cooling bed CB, and a drive chain 33 that can move in the front-rear direction of the cooling bed CB. The front sprocket 331 and the rear sprocket 332 that are wound, the sprocket 341 of the drive wheel 34 that is wound around the drive chain 33 and imparts a rotational driving force, and other sprockets 342, and further the rotational force is applied to the driving wheel 34. A drive motor 35 with a rotation detector that can be continuously switched is provided, and a control panel 36 and an operation panel 37 that control the rotation of the drive motor 35.

  The movable claw 32 is rotatably fixed to the product feed / transfer carriage TF by a rotation fixed shaft 321, and the tip of the movable claw 32 protrudes from between the floor rails 31 when moving forward, that is, in the mist spray cooling process 4 direction. The rear end of the movable claw 32 on the opposite side to the rotation fixed shaft 321 is pulled by the claw inverted chain 38 toward the traveling direction side so as to push out the unequal side unequal thick angle steel A on the upper surface of the floor bar 31. Further, when moving backward, that is, in the direction opposite to the mist spray cooling process 4, the tip is inserted between the floor rails 31 and pulled in the backward direction by the claw inverted chain 38 so as not to appear on the upper surface of the floor rail 31. It is supposed to be.

  As shown in FIG. 8, the unequal side unequal thickness angle steel A (1) deformable in a high temperature state fed from the cooling water jetting conveyance roller table WT by the movable claw 32 by such a product feeding and transporting carriage TF is misted. In order to advance in the spray cooling process 4 direction, all the movable claws 32 are erected from the rear of the unequal side unequal thickness steel A (1) placed on the upper surface of the floor rail 31 and advanced in the arrow M direction. . At this time, as shown in FIG. 10, since the movement control of each product feed carriage TF is performed independently, the bending deformation due to the cooling of the unequal side unequal thickness steel A is controlled by the travel distance control of the feed carriage. In consideration, the bending amount X is set so that the central part in the longitudinal direction on the short side A2 side of the unequal side unequal thick angle steel A (2) proceeds at a slower speed than both ends and the entire length becomes an arcuate shape. It is made to move on the floor rail 31 while ensuring. In this state, after transporting the unequal side irregular thickness iron A (2) to a predetermined position on the floor rail 31, the movable claw 32 is retracted from the upper surface of the floor rail 31 to be retracted and returned to the original state. Wait for extrusion of unequal side unequal thickness steel A. Thereafter, this is repeated, but the reason why the central portion is bowed backwards is that the short side A2 is thick and difficult to cool down, so it is in a high temperature state, and the degree of shrinkage is large when cooled. Because it becomes. For this reason, the unequal side unequal thickness angle steel A (3) placed on the upper surface of the floor rail 31 is approximated to a linear shape due to thermal stress over time.

  All the operations of the above-described product feed / transfer carriage TF and movable claw 32 can be automatically performed by programming in advance. That is, since all the product feeding transfer carts TF can be controlled independently, various conditions of the unequal side unequal thick angle steel A, that is, the length, thickness, and total length of the short side A2 and the long side A1, Depending on the temperature, steel type, etc., control is performed in consideration of how much the bending shape becomes an arcuate shape, and the amount of bending becomes small and hardly occurs, so that the work of the subsequent process becomes easy.

  More specifically, the degree of bending of the unequal side unequal thick angle steel A (2), which is an arcuate shape, is determined according to the above conditions so that the bending speed of the movable claw 32 of each product feed carriage TF is least likely to bend. The operation panel 37 is used for operation. Alternatively, when the causal relationship between the various conditions and the bending degree after cooling can be predicted in advance, the various conditions can be automatically measured and input to automatically control based on a computer.

  The unequal side unequal thickness angle steel A (3) transferred to the central portion of the cooling floor CB on the floor rail 31 by the product feed carriage TF is being naturally cooled but is still at a high temperature. Further, the non-equal unequal thickness angle steel A (3) is transferred to the mist spray cooling step 4 at the other end of the cooling bed CB. Here, as shown in FIG. 11, the mist in which water is atomized from below between the floor rails 31 is sprayed from the back surface of the unequal side unequal thick angle steel A to allow the cooling to proceed. Here, an example in which water supplied through the pipe 43 from the pump 42 rotated by the drive source 41 controlled by the control panel 40 is jetted as mist from the tip of the discharge pipe 44 has been described. A configuration in which the mist is ejected from above the thick steel section A, or a configuration in which the mist is ejected from the vertical direction may be employed.

  The temperature of the unequal-side unequal thick angle steel A (4) cooled by the mist spray cooling step 4 has almost no temperature difference between the short side A2 and the long side A1, and has decreased to about 50 ° C. The equal side unequal thick angle steel A (5) is transferred to the next roller correction step 5 by a transfer device (not shown).

  The non-equal-side unequal thick angle steel A manufactured through the above steps is bent and deformed as shown in (2) → (5) in FIG. 10 in the cooling process on the cooling bed CB. The unequal-side unequal pressure angle steel material (product) before the roller correction has a small amount of bending and the temperature drops to about 50 ° C., and the roller correction machine RS in this roller correction process 5 causes large bending and wave distortion. It does not occur, and high-quality, high-yield unequal unequal thickness steel A (5) shows an example in which a lateral bend h 'occurs, which is also corrected by the roller straightening machine RS.

  According to the manufacturing method of unequal side unequal thickness chevron steel of the present invention, the rolled material of unequal side unequal thickness chevron A is continuously rolled step 1, water cooling step 2, arcuate feed step 3, mist ejection step 4 and roller correction. By performing in the order of step 5, large bending and wave distortion do not occur, and high quality, high yield, high efficiency unequal unequal thickness angle steel A can be obtained.

  The manufacturing method of the unequal side unequal thickness angle steel according to the present invention can be effectively used when manufacturing a shape steel having an asymmetrical cross section in addition to the unequal side unequal thickness angle steel. Wide range.

DESCRIPTION OF SYMBOLS 1 Continuous rolling process 2 Water cooling process 3 Bow delivery process 4 Mist injection cooling process 5 Roller correction process RF Heating furnace BD Bulk rolling mill RM Rough rolling mill IM Intermediate rolling mill FM Finishing rolling mill WT Cooling water injection conveyance roller table TF Product feeding Transfer truck CB Cooling floor WR Cooling floor product cooling device RS Roller straightening machine A Unequal side unequal thickness angle steel A1 Long side A2 Short side

Claims (8)

  The material heated in the heating furnace is a rough rolling mill, an intermediate rolling mill, and a finishing rolling mill. One roll, one direction, one pass, and continuous rolling in a skewer arrangement. A continuous rolling process for final forming, a water cooling process for transporting the unequal side unequal thickness rolled material straightly in the longitudinal direction and spraying water on the front and back surfaces of the short side for cooling, and finishing the water cooling process for conveyance An arch-shaped feeding step of feeding the unequal-sided unequal thick angle-shaped steel to the upper surface of the floor rail of the cooling bed in a direction substantially perpendicular to the longitudinal direction so that the central portion in the longitudinal direction bulges to the short side The mist injection cooling process in which the mist is injected onto the unequal side unequal thick angle steel that has been sent out by the arcuate delivery process and is naturally cooled on the upper surface of the floor beam, and the mist injection cooling process is completed. Roller correction for correcting irregular unequal thickness steel Method for producing a scalene unequal thickness angle steel, characterized by comprising the steps, a.   The water-cooling step has at least a short position while maintaining a steady posture in which the short side is always in close contact with the vertical roller while the unequal side unequal thickness angle steel is shaped like a square and placed on the oblique conveyance roller and conveyed. The method for producing an unequal side unequal thick angle steel according to claim 1, which is a step of cooling by spraying water on the front and back sides of the side.   The arch-shaped feeding step is performed by a movable claw that can be moved in and out of a plurality of product feeding and transporting carriages that are independently controlled in speed between a plurality of parallelly arranged floor rails constituting the cooling floor. 3. The method of manufacturing an unequal side unequal thickness angle steel according to claim 1 or 2, which is a step of advancing so that the short side direction side of the center portion in the longitudinal direction of the equal thickness angle steel swells backward in an arc shape.   The mist injection cooling step is a step of injecting mist-like water for a predetermined time over the entire lower surface of the unequal side unequal thickness angle steel on the upper surface of the floor rail of the cooling floor. The manufacturing method of an unequal side unequal thick angle steel in any one of Claims 1 thru | or 3. A cooling water jetting and conveying roller table used in a water cooling step in the method of manufacturing an unequal side unequal thick angle steel according to any one of claims 1 to 4,
A traveling direction of the unequal side unequal thickness chevron that is arranged in a large number to assist the conveyance of the unequal side unequal thickness chevron and that has an appropriate gap between each other and proceeds in a letter shape A fixed plate that is inclined and arranged so that the side is slightly higher,
A rotatable vertical roller provided at appropriate intervals along a side edge in one direction of the fixed plate, and the non-equal side unequal while the short side of the unequal side unequal thick angle steel approaches the side of the vertical roller. A gap between the fixed plates is spaced at an appropriate interval so that the thick angle steel is transported in the moving direction and the rotation axis is inclined with respect to the moving direction and is slightly higher than the upper surface of the fixed plate. An obliquely conveying roller that can be driven to rotate, and
A lower water distribution pipe having a short side back surface injection nozzle that injects cooling water obliquely upward from below the gap between the fixed plates, and cools the back surface of the short side of the unequal side unequal thickness chevron.
A side water pipe having a short-side surface spray nozzle that cools the surface of the short side by spraying cooling water in a substantially horizontal direction from the upper side of the fixed plate on the vertical roller side;
An upper water distribution pipe having a long side surface injection nozzle for injecting cooling water from above the fixed plate toward the long side of the unequal side unequal thick angle steel to cool the surface of the long side. Cooling water jetting conveyance roller table.   The short-side back surface injection nozzle, the short-side surface injection nozzle, and the long-side surface injection nozzle can each adjust the angle of the injection direction of the cooling water, and the lower water distribution pipe, the side water distribution pipe, and the upper part The cooling water jetting / conveying roller table according to claim 5, wherein the water distribution pipe is capable of adjusting a water amount and a water pressure of the cooling water in each of the water distribution pipes. A cooling bed used in an arc-shaped feeding step and a mist spray cooling step in the method for producing an unequal side unequal thickness angle steel according to any one of claims 1 to 4,
A plurality of floor rails that are arranged in a direction perpendicular to the longitudinal direction of the unequal side unequal thickness chevron and are laid with an appropriate gap between each other,
A product feed transfer carriage that is disposed between the floor rails and can be independently driven in the front-rear direction along the floor rails;
A movable claw that is rotatably fixed to each of the product feeding and transporting carriages, and can move up and down above the floor rails through a gap between the floor rails,
When the product feed carriage moves from one end of the floor rail to the other end, the product feed carriage located at the center of the unequal side unequal thickness iron is at both ends of the unequal side unequal thickness iron. The product feed carriage moves at a speed slower than that of the product feed carriage positioned in the section, and the product feed carriage projects the movable claw above the floor runner from the gap between the floor rungs. Move the angle steel by pushing it out with the movable claw,
When the product feed carriage moves from the other end of the floor rail to the one end direction, the product feed carriage causes each of the movable claws to be immersed below the floor rail through a gap between the floor rails. And cooling floor. A discharge pipe for injecting mist from the tip of the unequal side unequal thick angle steel at the other end of the floor rail,
A pump for supplying water to the discharge pipe through a pipe;
The cooling bed according to claim 7, further comprising: a drive source that rotationally drives the pump; and a control panel that controls the drive source.

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