JP2008100245A - Apparatus and method for cooling hot-rolled wire material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for cooling a hot-rolled wire material, by which apparatus and method, the uniformity of cooling and the degree of freedom of installation can be advantageously secured. <P>SOLUTION: The apparatus for cooling the hot-rolled wire material comprises a cooling pipe for forcedly cooling the hot-rolled wire material running through the inside thereof. The cooling pipe is divided into a plurality of sections in the circumference of the rolled material, and has a system for supplying refrigerant for every section. Further, every system for supplying refrigerant has a gas blowing system for mixing gas into the refrigerant liquid at an arbitrary ratio. In addition, thermometers for measuring the temperature of the rolled material in at least two sections of a plurality of circumferential sections of the rolled material are arranged on an inlet side and an outlet side of the cooling apparatus. Further, the cooling pipe in the cooling apparatus is arranged such that the pass line of the rolled material has a required curvature or a gradually changing curvature. The cooling condition is controlled for every section in the circumference of the rolled material using the apparatus. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention is a method of continuously rolling hot steel, alloy steel, stainless steel, etc. into a wire rod such as a rod having a circular cross section, a wire rod, etc. The present invention relates to an improvement of a cooling device and a cooling method for cooling with a cooling medium such as water.

  In hot rolling of wire rods and rods, controlled rolling and controlled cooling are often performed with the aim of improving the mechanical properties and surface properties of the wire rod after rolling. Most of the cooling medium with a large heat transfer coefficient is cooled with water in order to suppress recrystallization of the internal structure of the rolled material due to processing heat generated during rolling and to reduce the size of the material. It is carried out.

  Various methods have been developed so far for cooling devices for hot-rolled wire rods, but most of them are cooling tube methods that cool water by blowing water into the tube and filling it with the rolled material. Has been adopted. And from the viewpoint of improving the mechanical properties and surface properties of the wire rod, various devices for uniformly cooling the rolled material have been invented.

  In Patent Document 1 and Patent Document 2, a roller guide whose axis is operated is installed in the cooling device, and the roller guide is applied to the rolled material passing through the device from one direction, or the rolled material is sandwiched by the roller guide from two directions. Thus, an invention is disclosed in which the center of the cooling pipe and the center of the rolled material are substantially coincided with each other. As a result, the gap formed between the rolled material and the inner wall of the cooling pipe is made constant, the conditions of the cooling medium flowing around the same are made the same, and the cooling is made uniform.

  Patent Document 3 discloses an invention in which a swirling flow in the circumferential direction of the rolled material is generated in the cooling pipe to eliminate stagnation and drift of the cooling medium and to achieve uniform cooling.

Furthermore, in recent years, the importance of controlled cooling during rolling has increased due to increasing quality requirements for mechanical properties and surface properties. Many new rolling lines are equipped with water cooling devices during rolling (hereinafter referred to as intermediate water cooling devices). It is common to provide future installation space. On the other hand, although there is a movement to install an intermediate cooling device even in an existing rolling line, the linear length necessary for cooling may be insufficient. In this case, there is a case where an installation space for the apparatus is obtained by adding a branched detour line as in the invention described in Patent Document 4.
JP 54-141368 A JP 59-166317 A JP-A-62-139827 JP 2000-094004 A

  However, the cooling means according to the above prior art still has room for improvement in terms of ensuring the uniformity of cooling and the degree of freedom of installation.

  First, the issues from the uniformity of cooling will be described.

  Conventionally, as in the inventions described in Patent Documents 1 and 2, the gap between the cooling pipe and the rolled material is made uniform, or as in the invention described in Patent Document 3, the drift of the cooling water around the rolled material is reduced. It has been noted that the cooling conditions around the rolled material are made uniform by eliminating them. These prior arts are based on the idea of making the surrounding cooling conditions uniform regardless of the state of the rolled material. However, in order to further improve the cooling accuracy of the rolled material, it is necessary to consider the non-uniformity generated in the rolled material itself before the start of cooling. This non-uniformity largely includes non-uniformity in the temperature of the rolled material and non-uniformity in the surface texture. Hereinafter, those non-uniformities will be described in detail.

  In general, hot rolling of a wire rod uses a roll having a hole shape. In many cases, the material is sandwiched between two pairs of perforated rolls, but a three-way roll or a four-way roll may be used. FIG. 4 is a diagram schematically showing the state of the rolled material immediately below the roll of the final rolling stand before the start of cooling of the wire rod with two pairs of perforated rolls, in a vertical sectional view in the roll axis direction. That is, the material shape 32 on the entry side when rolled into a circle at the final rolling stand before the start of cooling is often an ellipse. When the elliptical shape 32 is deformed into the circular shape 3, the portion 33 constrained by the hole shape of the roll 31 has a larger deformation amount than the other portions, and therefore the processing heat generation amount is also larger than the portion 34 not constrained by the hole shape. Become. As a result, the temperature distribution of the circumferential cross section is higher in the portion 33 constrained by the hole shape and lower in the portion 34 not constrained. Further, the surface of the rolled material in the portion 33 constrained by the hole mold is smoothly formed by transferring the machined surface of the roll 31, but the surface of the unconstrained portion 34 is sandwiched by the roll 31 and compressed. Since fine wrinkles occur, the surface roughness increases and the contact area with the cooling medium increases. Due to these phenomena associated with rolling, the rolled material is in a state where the temperature of the portion 33 constrained by the hole mold of the final rolling stand before cooling is high and difficult to cool, and conversely, the temperature of the portion 34 not constrained by the hole mold is high. It becomes low and easy to cool.

  Thus, if the temperature in the cross section and the surface properties of the rolled material itself are non-uniform, there is a natural limit to uniformly cooling the rolled material even if the surrounding cooling conditions are uniform as in the prior art, Variations in mechanical properties and surface quality after cooling could not be eliminated.

Furthermore, in the rolling line, the temperature of the rolled material is measured before and after the controlled cooling, and this result is often used for setting the condition of the cooling device, that is, for controlling the flow rate. The temperature at one point was measured, and even if there was a temperature difference in the circumferential direction of the rolled material, it could not be grasped. Moreover, even if the temperature is measured at a plurality of points in the circumferential direction, there is no means for changing the cooling condition in the circumferential direction of the rolled material, and the temperature difference cannot be reduced.
Until now, the temperature in the cross section of the rolled material and the unevenness of the surface properties have occurred within a certain range, and even after the subsequent adjustment cooling, it is considered that the filament material has some degree of quality variation. Machining was performed in anticipation of the safety factor and yield, and no particular problem occurred. However, in recent years, the required quality such as mechanical properties and surface properties for the wire rod has been stricter, and in order to meet this demand, it has become necessary to make cooling more uniform than ever.

  Next, the problem from the aspect of installation flexibility is described.

  In the conventional cooling device, the trajectory (hereinafter referred to as a pass line) through which the steel material passes is a straight line. This has the aim of avoiding uneven uneven cooling due to uneven steel in the cooling device. However, the fact that the pass line of the cooling device has to be straight in this way has a problem of restricting the equipment layout of the rolling line. When constructing a new rolling mill, the degree of freedom in equipment design is large, and there are few cases where the installation space becomes a problem. However, in the existing rolling line, especially when the intermediate cooling device is modified or added, a linear installation space is required. In many cases, the problem of the installation space of the cooling device is serious. Moreover, even when providing a branch line like patent document 4, there exists a problem that interference with the existing installation must be avoided. Due to these restrictions, a cooling device having an insufficient length, that is, an inadequate cooling capacity is allowed, or the interference part is modified at an increased cost, thereby reducing the degree of freedom of installation. was there.

  Accordingly, an object of the present invention is to provide a hot-rolled wire rod cooling device and a cooling method that can perform more uniform cooling than the above-described prior art and have improved installation flexibility. Is.

  As a result of diligent investigations to solve the above-described problems of the prior art, the inventors simply positioned the rolled material at the center of the cooling pipe or made the conditions of the cooling medium flowing around the rolled material uniform. It has been found that even more uniform cooling is possible by changing the cooling conditions in the circumferential direction according to the non-uniformity in the cross-section or circumferential direction that the rolled material has before the start of cooling. It was. That is, a lot of cooling medium is sprayed on the part where the temperature is high and the surface is smooth and difficult to cool, and conversely, the amount of cooling medium sprayed is reduced on the part where the temperature is low and the surface is rough and easy to cool. By arbitrarily changing the cooling conditions given from the surroundings according to the temperature and surface properties, it is possible to make the cooling uniform in the circumferential cross section of the rolled material and to reduce the variation in mechanical properties and surface properties compared to the conventional one. It becomes possible.

  The rolling conditions such as the roll hole shape, the gap between the upper and lower rolls, and the tension between the rolling stands vary depending on the composition of the rolled material and the finished size of the line material used as the product. The uniform state will also change. However, since such rolling conditions are generally managed as manufacturing standards, the temperature in the circumferential direction of the rolled material and the uneven state of the surface properties are also reproducible depending on the type and size of the rolled material to be rolled. Therefore, the cooling conditions to be changed in the circumferential direction need to be changed according to the type and size of the rolled material to be rolled, but can be determined in advance according to the rolling conditions.

  Next, in order to further increase the accuracy of homogenization, the temperature of the rolled material in the rolling line is measured at a plurality of points where a temperature difference is likely to occur in the circumferential direction, and the cooling medium spraying of the cooling device is performed according to the measurement result. Feedback to change conditions or feedforward control is performed. Thereby, it is possible to cope with variations in rolling conditions that vary within the management standard of the manufacturing standard, such as the heating history of one billet, the wear condition of the roll hole mold, the tension between the stands and the roll gap.

  Furthermore, when the rolled material is bent and passed through the cooling device, even if the rolled material is biased in the cooling pipe and the flow of the surrounding cooling medium becomes uneven, the temperature in the cross section can be changed by changing the circumferential cooling conditions. Variation can be reduced. The bending trajectory may be constant in the cooling device or may be changed in the cooling device, and the bending direction may be horizontal, up and down, or a combination thereof. As a result, the degree of freedom of the place where the cooling device is installed is dramatically increased.

  The present invention has been made for the first time after further investigation based on the above findings, and the gist thereof is as follows.

(1) In a cooling apparatus for hot-rolled wire rods, provided with a cooling tube that forcibly cools the hot-rolled wire rods passing through the internal space with a cooling medium, the cooling tubes are divided into a plurality in the circumferential direction. An apparatus for cooling a hot-rolled wire rod, comprising a cooling medium supply system for each section.

(2) The heat according to (1), wherein the cooling medium is a liquid, and each of the supply systems of the cooling medium has a gas blowing system that mixes a gas with the liquid at an arbitrary ratio. Cooling device for cold rolled wire rod.

(3) Thermometers for measuring the surface temperature of the rolled material for portions corresponding to at least two or more of the plurality of sections of the cooling pipe are arranged on the inlet side and / or the outlet side of the cooling device. The apparatus for cooling a hot-rolled wire rod according to (1) or (2), characterized in that it is provided.

(4) The cooling pipe is provided with one or a plurality of continuous cooling pipes so that a pass line of the rolled material has a predetermined curvature or a gradually changing curvature. (1) The cooling device for hot-rolled filament material according to any one of (3).

(5) In the method of cooling a hot-rolled wire rod by a cooling device provided with a cooling pipe that forcibly cools the hot-rolled wire rod passing through the internal space with a cooling medium, the circumferential direction of the hot-rolled wire rod A method of cooling a hot-rolled wire rod, wherein the rolling material is divided into a plurality of circumferential directions so as to eliminate the temperature deviation, and the cooling condition is controlled for each of the divisions.

(6) The cooling medium is a liquid, and the cooling condition is controlled by mixing the liquid and gas at an arbitrary ratio for each of the cooling sections. Method for cooling hot-rolled wire rod.

(7) On the entry side and / or exit side of the cooling device, the surface temperature of the rolled material is measured for portions corresponding to at least two or more of the plurality of sections of the cooling pipe, and the measurement result The method for cooling a hot-rolled wire rod according to (5) or (6), wherein the cooling condition is controlled based on the above.

(8) The rolling material is caused to pass through the cooling pipe disposed in the cooling device so that the pass line of the rolling material has a predetermined curvature or a gradually changing curvature, or one of a plurality of continuous cooling devices. The method for cooling a hot-rolled filament material according to any one of (5) to (7) above, wherein the cooling is performed while cooling.

  According to the present invention, it is possible to uniformly cool the rolled material, and the accuracy of control cooling is improved. For this reason, as a result of reducing the variation in the mechanical properties and surface properties of the rolled material after cooling, the amount of out-of-quality quality in the process can be reduced. Further, when an alloy is added for the purpose of reducing the influence of the variation, the amount can be reduced. Alternatively, if online control cooling could not be performed due to the above-mentioned variation and heat treatment was performed in a separate process after rolling, this could be changed to online control cooling, and the steel material required for heat treatment in a separate process could be changed. Heating is not necessary, and the manufacturing cost can be reduced. Furthermore, since the variation is reduced in the next process, the processing efficiency and the yield can be improved. Furthermore, according to the present invention, even when a cooling device is installed in a portion where the pass line is bent, uniform cooling can be performed. It becomes possible to install the device, and the degree of freedom of the pass line design is increased. As a result, even in the case where the cooling device cannot be installed online, the cooling device can be installed online, so that the heat treatment performed in a separate process can be omitted and the manufacturing cost can be reduced. In addition, since the degree of freedom of installation increases, interference equipment is reduced and installation costs can be reduced when a cooling device is provided on an existing line. As described above, according to the present invention, it is possible to advantageously solve the problems of the cooling uniformity and the degree of freedom of installation in the conventional cooling of hot-rolled wire rods, and thus the industrial effects are immeasurable.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a diagram schematically illustrating the configuration of a cooling device 1 according to an embodiment of the present invention. In the figure, a gantry 4 having a built-in tube for passing a cooling medium in the rolling direction is incorporated in the cooling device 1, and a cooling tube 2 is installed thereon.

  FIG. 2A shows details of the cooling pipe 2. The cooling pipe 2 is composed of a body composed of an outlet body 5 and an inlet body 6, an outlet cooling pipe 7, an inlet cooling pipe 8, a partition plate 9, a connection pipe 10, and the like. It is preferable that the bodies 5 and 6 have a two-divided structure in order to incorporate the partition plate 9 and are coupled with a through bolt or the like. Grooves along the tube axis direction are provided in the inner surfaces of the bodies 5, 6 and the outlet side cooling pipe 7 and the inlet side cooling pipe 8, so that the partition plate 9 shown in a single view in FIG. . The outlet side cooling pipe 7 and the inlet side cooling pipe 8 are inserted from the front and rear after assembly of the body, and the respective flange portions are fixed with bolts, whereby the inner space of the inlet side cooling pipe 8 and the inner space of the outlet side cooling pipe 7 are fixed. Are connected, and a passage P is formed through which the rolled material 3 can travel from the entry side to the exit side.

  An annular gap T is formed between the outlet side cooling pipe 7 and the inlet side cooling pipe 8 respectively inserted into the bodies 5 and 6 and used as a blowout port for feeding the cooling medium from the outside to the inside of the passage P. Has been. In the present embodiment, as shown in FIG. 2A, the inlet side end portion of the outlet side cooling pipe 7 has a shape in which the outer portion protrudes more toward the inlet side than the inner portion, and matches this shape. As described above, at the outlet end portion of the inlet side cooling pipe 8, the inner portion protrudes more toward the outlet side than the outer portion. As a result, the gap (blowing port) T formed between the outlet side cooling pipe 7 and the inlet side cooling pipe 8 is directed from the inlet side (that is, outside the passage P) toward the outlet side (that is, inside the passage P). It is formed into a conical shape that gradually decreases in diameter.

  FIG. 3 is a cross-sectional view of the cooling pipe 2 shown in FIG. In the present embodiment, as shown in FIG. 3, four partition plates 9 are used. These four partition plates 9 are respectively fitted in the grooves along the tube axis direction in the inner surfaces of the bodies 5 and 6, the outlet side cooling pipe 7 and the inlet side cooling pipe 8. Thus, a space K formed between the outer surfaces of the outlet side cooling pipe 7 and the inlet side cooling pipe 8 and the inner surfaces of the bodies 5 and 6, and an annular outlet for sending the cooling medium from the space K into the passage P T is partitioned by four partition plates 9, and is divided into four along the circumferential direction as shown in FIG.

  A pipe through which a cooling medium is passed in the rolling direction is provided inside the gantry 4, and after the cooling pipe 2 is attached to the gantry 4, the pipe in the gantry 4 and the cooling pipe 2 are connected by the connecting pipe 10. Each pipe in the gantry 4 is connected to a pipe branched from the cooling medium main pipe 11, and the pressure and flow adjustment comprising the pressure regulating valve 12, the flow meter 13, the flow regulating valve 14, the three-way valve 15 and the like in the middle. Incorporate means. Further, a pipe branched from the gas main pipe 16 is connected, and a pressure / flow rate adjusting means including a pressure adjusting valve 17, an orifice flow meter 18, a flow adjusting valve 19, a shutoff valve 20, a check valve 21 and the like is incorporated on the way. The gas can be mixed into the cooling medium.

  There is a gap between the inner surface of the passage P formed inside the outlet side cooling pipe 7 and the inlet side cooling pipe 8 and the outer surface of the rolled material 3. For this reason, even if the outlet T is divided in the circumferential direction and the cooling medium is sprayed from the respective outlets under different conditions, they are mixed with each other within the cooling pipe. When such a situation occurs, the space K and the outlet T in the cooling pipe 2 are sectioned in the circumferential direction, and the effect of enabling individual settings for each section is reduced. As a countermeasure against this, the length of the cooling pipe in the rolling direction is shortened by restraining the outlet side cooling pipe 7 and the inlet side cooling pipe 8 that have been extended from the bodies 5 and 6 to be substantially the same length as the bodies 5 and 6. It is preferable to increase the number of cooling pipes that can be installed in a certain length in the rolling direction as compared with the conventional one, and to increase the number of times of spraying the rolled material before mixing of the cooling medium proceeds. Further, when the amount of sprayed cooling medium in a certain section is reduced, the pressure is also reduced and the cooling medium flows from the adjacent section, and the effect of partitioning the space K and the outlet T in the cooling pipe 2 is reduced. As a countermeasure, the pressure difference with the adjacent condition is made small by compensating for the pressure drop caused by the gas being mixed in advance and the amount of the cooling medium is reduced, so that the cooling medium between the adjacent areas is hardly mixed in the passage P. Is preferred.

  Further, the temperature in the circumferential direction of the rolled material 3 is measured at a plurality of points by a thermometer 21 at appropriate positions before and after the cooling device 1. Desirably, the surface temperature of the rolling material 3 is measured for a portion corresponding to each section obtained by dividing the space K and the outlet T in the cooling pipe 2 in the circumferential direction. Compare the measurement result with the reference value, if the measured temperature is higher than the reference value, increase the amount of the cooling medium. Conversely, if the measured temperature is lower than the reference value, decrease the amount of the cooling medium and mix the gas accordingly. Increase the amount. By feeding back or feeding forward this during rolling, it is possible to perform cooling with high accuracy in accordance with the actual state of the rolled material. Desirably, logic such as flow rate control of the cooling medium and gas mixing control according to the comparison between the measured value and the reference value is automatically incorporated into the control circuit of the cooling device.

  According to the above embodiment, the space K in the cooling pipe 2 and the blowout port T are divided in the circumferential direction, and individual setting for each division is made possible, whereby uniform cooling can be performed on the rolled material 3. This makes it possible to improve the accuracy of control cooling. For this reason, as a result of reducing the variation in the mechanical properties and surface properties of the rolled material after cooling, the amount of out-of-quality quality in the process can be reduced. Further, when an alloy is added for the purpose of reducing the influence of the variation, the amount can be reduced. Alternatively, if online control cooling could not be performed due to the above-mentioned variation and heat treatment was performed in a separate process after rolling, this could be changed to online control cooling, and the steel material required for heat treatment in a separate process could be changed. Heating is not necessary, and the manufacturing cost can be reduced. Furthermore, since the variation is reduced in the next process, the processing efficiency and the yield can be improved.

  Furthermore, the space K and the blowout port T in the cooling pipe 2 are divided in the circumferential direction, and the path of the rolling material 3 formed by the cooling device 1 is provided by the function of changing the blowing condition of the cooling medium for each division. Even when the line has a curved configuration as shown in FIG. 5, uniform cooling can be performed. The pass line of the rolled material 3 can be configured with either a predetermined curvature or a gradually changing curvature. In addition, the cooling pipe 2 may be a short pipe, and the outlet side cooling pipe 7 and the inlet side cooling pipe 8 in each cooling pipe 2 may be formed linearly in the axial direction. The outlet side cooling pipe 7 and the inlet side cooling pipe 8 which are formed in a curved shape in the pipe axis direction according to the curvature are used. In FIG. 5, a curved pass line of the rolled material 3 is formed by seven cooling pipes 2, but an arbitrary number of cooling pipes 2 may be used. Furthermore, installing the guide roller 35 between the cooling pipes 2 is effective from the viewpoint of preventing surface flaws of the rolled material 3 and improving inductivity.

  According to the above-described advantages, even when the cooling device is installed at a portion where the pass line is bent, uniform cooling can be performed. Can be installed, increasing the freedom of passline design. As a result, even in the case where the cooling device cannot be installed online, the cooling device can be installed online, so that the heat treatment performed in a separate process can be omitted and the manufacturing cost can be reduced. In addition, since the degree of freedom of installation increases, interference equipment is reduced and installation costs can be reduced when a cooling device is provided on an existing line. As described above, according to the present invention, it is possible to advantageously solve the problems of the cooling uniformity and the degree of freedom of installation in the conventional cooling of hot-rolled wire rods, and thus the industrial effects are immeasurable.

  In FIG. 1A, the cooling device 1 includes nine cooling pipes 2. In FIG. 2, each cooling pipe divides the blowing port T formed by the outlet side cooling pipe 7 and the inlet side cooling pipe 8 into four sections (partitions) of upper, lower, left and right using four partition plates 9. Opens through holes to feed the cooling medium to each section. Inside the gantry 4, four pipes are arranged in the rolling direction, and a connection pipe 10 is connected to the outside from the outside. Pressure and flow rate adjusting means including a pressure adjusting valve 12, a flow meter 13, a flow rate adjusting valve 14, a three-way valve 15 and the like are incorporated in the four pipes inside the gantry 4. In addition, a gas blower system that combines pressure and flow rate adjusting means including a gas pipe and a pressure adjusting valve 17, an orifice flow meter 18, a flow rate adjusting valve 19, a shutoff valve 20, a check valve 21 and the like is connected, and the amount of cooling medium or When the pressure is low, gas can be mixed. In this way, the cooling medium can be sent in different amounts and pressures for each room divided into four in the circumferential direction by dividing the space K in the bodies 5 and 6.

  In FIG. 1A, a thermometer 22 is arranged on the exit side of the cooling device 1. As shown in FIG. 1B, four thermometers 22 are arranged so as to measure the temperature in the up and down and left and right directions in the circumferential direction of the rolled material. Desirably, the temperature of the part corresponding to each division into which the space K in the cooling pipe 2 and the outlet T is divided as in the embodiment is measured, but the temperature and surface properties are highly symmetric in the vertical and horizontal directions. One of the upper and lower sides and either one of the left and right sides may be measured. However, in this case, the cooling accuracy on the non-measurement side is inferior compared to the case where the upper, lower, left, and right sides are arranged. Then, the measured temperature is compared with a reference temperature in a cooling control device (not shown). If the measured value is higher, the amount of the cooling medium is increased, and if the measured value is lower, the amount of the cooling medium is decreased. The thermometer 22 is installed on the exit side of the cooling device 1 when feedback control is mainly performed, and is installed on the entrance side of the cooling device 1 when feedforward control is mainly performed. The thermometer 22 may be installed on both the entry side and the exit side of the cooling device 1, and the measured values may be weighted and evaluated to control the amount of the cooling medium. Moreover, you may use the measured result for control with respect to the following rolling material.

  When incorporating as an intermediate cooling device for an existing rolling line, the device is bent to fit the line as shown in FIG. Although the figure shows an example of bending with the same curvature, the bending method may be a combination of a plurality of curvatures, a combination of bending in the horizontal and vertical directions, or a combination with a straight line. In the figure, a guide roller 35 is installed between the cooling pipes 2 to prevent scuffing.

  FIG. 6 shows an example in which an intermediate cooling device is installed in an existing rolling line. FIG. 6 (a) is an example in which the present invention is not used, and since the water cooling device is a straight line, the bending trough is extended between the intermediate rolling mills 37 in order to obtain a predetermined cooling length. The space required for installation has increased. On the other hand, FIG. 5B is an example using the present invention, and the water-cooling device can be installed in the middle rolling mill 37 in place of the bent trough that was originally provided, and the present invention is not used. Compared with the case, the expansion of the installation space is suppressed and the cost is reduced.

  The present invention is a method of continuously rolling hot steel, alloy steel, stainless steel, etc. into a wire rod such as a rod having a circular cross section, a wire rod, etc. It is useful for a cooling device that cools with a cooling medium such as water.

(A) is a figure which illustrates typically one Example of the cooling device by this invention in a side view, FIG.1 (b) is typical of one Example of the temperature measurement in the cooling device by this invention. FIG. (A) is a figure which illustrates typically one Example of the cooling pipe incorporated in the cooling device by this invention with a sectional side view, (b) is one implementation of the partition plate incorporated in the cooling pipe by this invention It is a figure which illustrates an example typically. It is a figure which illustrates typically one Example of the cooling device by this invention with front sectional drawing and piping system diagram. It is a figure which illustrates typically rolling by two pairs of rolls. It is a figure which illustrates typically one Example of the cooling device with a bending part by this invention with a top view. (A) is a figure which illustrates typically the example which installed the intermediate cooling device in the existing rolling line, without using this invention, (b) is an intermediate cooling device in the existing rolling line using this invention. It is a figure which illustrates the example installed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cooling device 2 Cooling pipe 3 Rolled material 4 Base 5 (Exit side) Body 6 (Incoming side) Body 7 Outlet cooling pipe 8 Inlet side cooling pipe 9 Partition plate 10 Connection pipe 11 Cooling medium main pipe 12 Pressure adjusting valve 13 Flow meter 14 Flow adjustment valve 15 Three-way valve 16 Gas main pipe 17 Pressure adjustment valve 18 Flow meter 19 Flow adjustment valve 20 Shut-off valve 21 Check valve 22 Thermometer 31 Roll 32 Material shape before rolling 33 Restrained to hole shape in rolling material 34 Part to be Rolled and Not Restrained by Hole Type 35 Guide Roller 36 Coarse Rolling Mill Group 37 Intermediate Rolling Mill Group 38 Shear 39 Finishing Roller Group 40 Heating Furnace K Internal Space P Passage T Outlet

Claims (8)

In the cooling apparatus for hot-rolled wire rods, which is provided with a cooling tube that forcibly cools the hot-rolled wire rods passing through the internal space with a cooling medium, the cooling tubes are divided into a plurality in the circumferential direction. A cooling device for hot-rolled wire rods, characterized in that each has a supply system for a cooling medium. The hot rolling filament according to claim 1, characterized in that the cooling medium is a liquid and has a gas blowing system for mixing a gas with the liquid at an arbitrary ratio for each supply system of the cooling medium. Material cooling device. A thermometer for measuring the surface temperature of the rolled material for portions corresponding to at least two or more of the plurality of sections of the cooling pipe is disposed on the entry side and / or the exit side of the cooling device. The apparatus for cooling a hot-rolled wire rod according to claim 1 or 2, characterized in that: One or a plurality of continuous cooling pipes are disposed in the cooling device so that a pass line of the rolled material has a predetermined curvature or a gradually changing curvature. The hot-rolled wire rod cooling device according to any one of 3 above. In the method of cooling a hot-rolled wire rod by a cooling device equipped with a cooling pipe that forcibly cools the hot-rolled wire rod passing through the internal space with a cooling medium, the temperature deviation in the circumferential direction of the hot-rolled wire rod The method for cooling a hot-rolled wire rod is characterized in that the circumferential direction of the rolled material is divided into a plurality of sections so as to eliminate the problem, and the cooling conditions are controlled for each of the sections. The hot rolling line according to claim 5, wherein the cooling medium is a liquid, and the cooling condition is controlled by mixing the liquid and gas at an arbitrary ratio for each of the cooling sections. A method of cooling the strip. On the entry side and / or exit side of the cooling device, the surface temperature of the rolled material is measured for portions corresponding to at least two or more of the plurality of sections of the cooling pipe, and based on the measurement results The method for cooling a hot-rolled wire rod according to claim 5 or 6, wherein the cooling condition is controlled. Cooling is performed while the rolling material is bent and passed through the cooling pipe disposed in the cooling device so that the pass line of the rolling material has a predetermined curvature or a gradually changing curvature. The method for cooling a hot-rolled wire rod according to any one of claims 5 to 7, wherein

Images