JP2011184773A - Continuous annealing apparatus, and method for suppressing corrugation deformation of metal sheet during quenching in the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a continuous annealing apparatus capable of suppressing corrugation deformation of a metal sheet generated during the quenching, and a method for suppressing corrugation deformation of the metal sheet during quenching in the same. <P>SOLUTION: In the continuous annealing apparatus having a quenching unit, bridle rolls 10, 11 as tension changing means capable of changing the tension in a steel sheet 4 subjected to the quenching process by the quenching unit are provided before and behind the quenching unit. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  TECHNICAL FIELD The present invention relates to a continuous annealing facility that suppresses wave-like deformation occurring in a metal plate during rapid quenching when a metal plate is continuously passed through and subjected to annealing treatment, and a method for suppressing wave-like deformation of the metal plate in the equipment. It is. Here, the wave-like deformation refers to, for example, an ear wave deformation or a middle elongation deformation that occurs at an end portion or a center portion in the width direction of the metal plate, for example.

  In order to prevent the meandering of the metal plate in the first half (heating zone) of the continuous annealing furnace, a correction method is disclosed in which the shape of the metal plate is corrected flat using a predetermined mathematical formula before passing through the continuous annealing furnace. (For example, refer to Patent Documents 1 and 2).

  In addition, in a continuous annealing line, a method is disclosed in which a dummy material adjusted in material (component) is inserted between the two metal plates in order to connect two types of metal plates having different annealing conditions and to pass the plates efficiently. (For example, refer to Patent Document 3).

JP-A-62-67122 JP-A-63-69924 JP 2006-104492 A

  However, the correction methods disclosed in Patent Documents 1 and 2 are effective in preventing the meandering of the metal plate in the first half (heating zone) of the continuous annealing furnace, but the corrugated metal plate that occurs during quench quenching. It is powerless to prevent meandering in the second half of the continuous annealing furnace due to deformation. Naturally, there is no effect on reducing the shape (quality) defect of the metal plate as a product.

  Further, the method of changing the material of the dummy material as disclosed in Patent Document 3 is effective in preventing the dummy material from meandering, but is ineffective in preventing the product from meandering. In addition, since a dummy material having a material (component) adjustment suitable for conditions must be prepared, the cost increases.

  An object of the present invention is to solve the above-mentioned problems, and provide a continuous annealing facility capable of suppressing wave deformation of a metal plate that occurs during rapid quenching and a method for suppressing the wave deformation of the metal plate during rapid quenching in the facility. There is to do.

In order to achieve the above object, according to the first aspect of the present invention, in a continuous annealing facility having a rapid quenching part, the tension of the metal plate subjected to the rapid quenching process is changed in the rapid quenching part. The continuous annealing equipment is characterized in that a tension changing means capable of being provided is provided in the vicinity of the quenching and quenching portion.

  The invention according to claim 2 is the invention according to claim 1, wherein the tension of the metal plate is changed by the tension changing means, whereby the buckling eigenmode of the metal plate in the quenching and quenching step is Higher order than the buckling eigenmode of the metal plate that occurs when a tension equal to the tension applied to the metal plate before and after the quenching and quenching process is applied to the metal plate in the quenching and quenching process. It is configured to shift to a buckling eigenmode.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the tension changing means is configured such that the tension of the metal plate in the quench quenching process is greater than the tension of the metal plate before and after the quench quenching process. It is installed so that it may become large.

  The invention according to claim 4 is the invention according to claim 1 or 2, wherein the tension changing means is configured such that the tension of the metal plate in the quench quenching process is greater than the tension of the metal plate before and after the quench quenching process. It is installed so that it may become small.

  According to a fifth aspect of the present invention, in the first to fourth aspects of the invention, the tension changing means is a bridle roll provided before and after the quenching and quenching portion.

  Invention of Claim 6 changes the tension | tensile_strength of the metal plate attached | subjected to a rapid quenching process in the rapid quenching part in a continuous annealing facility by the tension change means provided in the said rapid quenching part vicinity, It is characterized by the above-mentioned. This is a method for suppressing wave-like deformation of a metal plate during rapid quenching in a continuous annealing facility.

  The invention according to claim 7 is the invention according to claim 6, wherein the buckling eigenmode of the metal plate in the quenching and quenching step is performed by changing the tension of the metal plate by the tension changing means. A higher-order seat than the buckling eigenmode of the metal plate that occurs when a tension equal to the tension applied to the metal plate before and after the quenching and quenching process is applied to the metal plate in the quenching and quenching process. It is intended to shift to the bending eigenmode.

  The invention according to claim 8 is the invention according to claim 6 or 7, wherein the tension changing means causes the tension of the metal plate in the quench quenching process to be greater than the tension of the metal plate before and after the quench quenching process. It is characterized by being made larger.

  The invention according to claim 9 is the invention according to claim 6 or 7, wherein the tension changing means causes the tension of the metal plate in the rapid quenching process to be greater than the tension of the metal plate before and after the rapid quenching process. It is characterized by being made smaller.

  According to a tenth aspect of the present invention, in the inventions according to the sixth to ninth aspects, the tension changing means is a bridle roll provided before and after the quenching and quenching portion.

  As described above, the continuous annealing equipment according to the present invention is a continuous annealing equipment having a rapid quenching portion, and tension changing means capable of changing the tension of the metal plate subjected to the rapid quenching process in the rapid quenching portion. Is provided in the vicinity of the quenching and quenching portion, so that it is possible to realize a continuous annealing facility capable of suppressing wave-like deformation of the metal plate that occurs during quenching and quenching.

  In addition, the method for suppressing wave deformation of a metal plate during rapid quenching in the continuous annealing facility according to the present invention is the method for reducing the tension of the metal plate subjected to the quench quenching process in the quench quenching portion in the continuous annealing facility. Since it changes by the tension change means provided in the quenching part vicinity, the wave-like deformation of the metal plate which arises at the time of quenching quenching can be suppressed.

It is for demonstrating the structure of the rapid quenching process used as the premise of the continuous annealing equipment which concerns on this invention, (a) is a schematic front view, (b) is a temperature image figure. It is for demonstrating the buckling natural mode analysis result (when tension | tensile_strength X = 13MPa) of the steel plate in the rapid quenching process shown in FIG. 1, (a) is a top view of a steel plate, (b) is a steel plate It is a model front view of a buckling eigenmode. It is a model front view of the buckling natural mode of the steel plate for demonstrating the buckling natural mode analysis result (when tension | tensile_strength X> 13MPa) of the steel plate in the rapid quenching process shown in FIG. It is a model front view of the buckling natural mode of the steel plate for demonstrating the buckling natural mode analysis result (when tension | tensile force X <13MPa) of the steel plate in the rapid quenching process shown in FIG. It is a schematic front view for demonstrating one Embodiment of the continuous annealing equipment which concerns on this invention. It is a model front view for demonstrating another embodiment of the continuous annealing equipment which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described in detail.

(Configuration of continuous annealing equipment according to the present invention)
The continuous annealing equipment according to the present invention is a continuous annealing equipment having a rapid quenching section, wherein the rapid quenching section includes a tension changing means capable of changing a tension of a metal plate subjected to a rapid quenching process in the rapid quenching section. It is provided near the entrance.

  Since it is the above structures, the continuous annealing equipment which can suppress the wave-like deformation of the metal plate which arises at the time of rapid quenching is realizable.

(Method for suppressing wavy deformation of metal plate during rapid quenching in continuous annealing equipment according to the present invention)
The method for suppressing wavy deformation of a metal plate at the time of rapid quenching in the continuous annealing facility according to the present invention is the method for controlling the tension of the metal plate to be subjected to a quench quenching process in the quench quenching portion in the continuous annealing facility. It is characterized by being changed by a tension changing means provided in the vicinity.

Since it is the above methods, it can suppress the wave-like deformation of the metal plate which occurs at the time of quenching and quenching.

  Below, the structure of the continuous annealing equipment which concerns on this invention, and the reason which came to the wave-like deformation suppression method of the metal plate at the time of rapid quenching in the equipment are demonstrated.

  The present inventors have studied earnestly whether or not the wave deformation of the metal plate generated during the rapid quenching can be directly suppressed, and examined the wave deformation of the metal plate generated during the rapid quench quenching from both an experiment and a simulation.

First, the structure of the rapid quenching process which is the premise of the continuous annealing equipment according to the present invention will be described with reference to the schematic front view shown in FIG. In FIG. 1 (a), 1 is a water tank in which water for quenching and quenching 2 is stored so that the depth is H, 3 is a pair of water ejection devices installed on the upper side of the water tank 1, and 4 is a pair of A steel plate having a width W = 1000 mm and a thickness t = 1.5 mm, which passes between the water ejection devices 3 and enters the water 2 and passes through the roller 5 obliquely upward to the right, 6 is a pair of water It is a water flow that is ejected from the slit nozzle of the ejection device 3 to both surfaces of the steel plate 4. FIG.1 (b) is a temperature image figure in the position which the steel plate 4 respond | corresponds when the steel plate 4 is let through as shown in Fig.1 (a) and it quenches and quenches. The steel sheet 4 is subjected to a temperature gradient of temperature ≒ 25 ° C. water 2 from the quench hardening temperature Tq ≒ 650 ° C. between the quench hardening region L _1. The steel plate 4 to be passed is subjected to a tension X = 13 MPa throughout the entire process including the rapid quenching process of a continuous annealing facility having a rapid quenching portion (water jetting device 3 and its associated facilities). When passing through such a quenching and quenching process, the steel plate 4 undergoes the wave-like deformation as described above.

  Therefore, a buckling eigenmode analysis was performed to determine under what conditions the above-mentioned wave deformation in the quenching and quenching process occurs. As a result, the steel plate 4 in the quenching and quenching process receives a tension X = 13 MPa, and the end portions 4a and 4c in the width W direction of the steel plate 4 as shown in the plan view of the steel plate 4 shown in FIG. It has been found that the buckling eigenmode (see FIG. 2B) in the case where there is a temperature difference of about 200 ° C. between the central portions 4b corresponds to the wave-like deformation in the rapid quenching process.

  From the above simulation (buckling eigenmode analysis), it was found that the wavy deformation occurs when there is a temperature difference of about 200 ° C. between the end portions 4a, 4c in the width W direction of the steel plate 4 and the central portion 4b. If the tension X applied to the steel plate 4 in the rapid quenching process is changed while this temperature difference is fixed, the buckling eigenmode of the steel plate 4 in the rapid quenching process can be changed. I came up with an idea. That is, the inventors have come up with the idea that if the tension X applied to the steel plate 4 in the quenching and quenching process is changed, the wave-like deformation in the quenching and quenching process can be directly suppressed.

  Therefore, a buckling eigenmode analysis was performed when the steel plate 4 in the quenching and quenching process was subjected to a tension X> 13 MPa and a tension X <13 MPa, respectively. As a result, as shown in FIGS. 3 and 4, it was found that the buckling eigenmode of the steel plate 4 shown in FIG. That is, this is because the steel plate 4 is generated when a tension equal to the tension applied to the steel plate 4 before and after the rapid quenching process (tension X = 13 MPa) is applied to the steel plate 4 in the rapid quenching process. It shows that it is possible to shift the buckling eigenmode of the higher order.

  Next, it occurs when a tension of the same magnitude as the tension (tension X = 13 MPa) applied to the steel sheet 4 before and after the rapid quenching process as described above is applied to the steel sheet 4 in the rapid quenching process. An embodiment as a specific example capable of shifting the buckling eigenmode of the steel plate 4 to a higher order will be described below with reference to FIGS. 5 and 6.

In FIG. 5, reference numerals 10 and 11 denote bridle rolls as tension changing means. In FIG. 5, the same components as those shown in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted. Spacing bridle rolls 10, 11 _{L 2} are provided on front and rear quenching sintered join the club so that _L 2> _{L 1} across the quench hardening region _{L 1.} By comprising in this way, it is possible to make the tension | tensile_strength X of the steel plate 4 in a rapid quenching process with the bridle rolls 10 and 11 larger or smaller than 13 MPa. Therefore, it is possible to realize a continuous annealing facility that can suppress the wave-like deformation of the steel plate 4 that occurs during rapid quenching. Further, since the bridle rolls 10 and 11 can change the rotation speed of the roll, the wavy deformation is caused by the size and material of the steel plate 4 (for example, width W = 800 to 1500 mm, thickness t = 0.6 to 2.3 mm). It is possible to control the tension so as to reduce the tension.

In FIG. 6, 15a and 15b are guide rolls. Also, in FIG. 6, as in the case of FIG. 5, the same components as those shown in FIG. The guide rolls 15a and 15b are provided in front of the rapid quenching portion. By installing the guide rolls 15a and 15b in the direction of arrow C with respect to the steel plate 4, the steel plate 4 is restrained in the out-of-plane direction. Guide rolls 15a, 15b and spacing of the roll 5, across the quench hardening region _{L 1,} is set to be larger than _{L 1.} Moreover, since the guide rolls 15a and 15b can be moved up and down, the tension X of the steel plate 4 in the rapid quenching process can be made larger than 13 MPa using the guide rolls 15a and 15b. Therefore, even in such a configuration, it is possible to realize a continuous annealing facility that can suppress the wave-like deformation of the steel plate 4 that occurs during rapid quenching. Further, even when such a configuration is adopted, the tension is such that the wavy deformation is reduced depending on the size (for example, width W = 800 to 1500 mm, thickness t = 0.6 to 2.3 mm) of the steel plate 4 and the material. Is possible to control.

  In the present embodiment, a steel plate and water cooling have been described as examples. However, the present invention is not necessarily limited to this, and the technical idea of the present invention can be widely applied to metal plates in general and rapid quenching in general.

  Further, if the configuration of the continuous annealing equipment according to the present invention and the method for suppressing the wavy deformation of the metal plate during rapid quenching in the equipment is used, the continuous annealing equipment capable of suppressing the wavy deformation of the metal plate that occurs during the rapid quenching. In addition to the above, the following effects are also exhibited. That is, by adopting the present invention, the out-of-plane deformation of the metal plate is reduced, and post-processing such as a recoiler for correcting the shape and rolling can be omitted. In addition, since the metal plate shape is stabilized, meandering in the reheating zone after quenching and quenching can be suppressed (stable passage).

1: Water tank 2: Water 3: Water ejection device 4: Steel plate 4a, 4c: End portion 4b: Central portion 5: Roll 6: Water flow 10, 11: Bridle roll 15a, 15b: Guide roll

Claims (10)

  In the continuous annealing equipment having a quench quenching section, a tension changing means capable of changing the tension of the metal plate subjected to the quench quenching process in the quench quenching section is provided in the vicinity of the quench quenching section. Continuous annealing equipment.   By changing the tension of the metal plate by the tension changing means, the buckling eigenmode of the metal plate in the quenching and quenching process is as large as the tension applied to the metal plate before and after the quenching and quenching process. 2. The structure according to claim 1, configured to shift to a higher-order buckling eigenmode than a metal plate buckling eigenmode generated when a tension tension is applied to the metal plate in the quenching and quenching step. Continuous annealing equipment.   The said tension change means is installed so that the tension | tensile_strength of the metal plate in the said rapid quenching process may become larger than the tension | tensile_strength of the metal plate before and after the said rapid quenching process. Continuous annealing equipment.   The said tension change means is installed so that the tension | tensile_strength of the metal plate in the said rapid quenching process may become smaller than the tension | tensile_strength of the metal plate before and behind the said rapid quenching process, The Claim 1 or 2 characterized by the above-mentioned. Continuous annealing equipment.   5. The continuous annealing equipment according to claim 1, wherein the tension changing means is a bridle roll provided before and after the rapid quenching portion.   Rapid quenching and quenching in continuous annealing equipment, wherein the tension of the metal plate subjected to the quenching and quenching process in the quenching and quenching section in the continuous annealing equipment is changed by a tension changing means provided near the quenching and quenching section. A method for suppressing wave-like deformation of a metal plate at the time.   By changing the tension of the metal plate by the tension changing means, the buckling eigenmode of the metal plate in the quenching and quenching process has the same magnitude as the tension applied to the metal plate before and after the quenching and quenching process. The continuous annealing equipment according to claim 6, wherein a transition is made to a higher-order buckling eigenmode than a buckling eigenmode of the metal plate that is generated when the tension of the metal is applied to the metal plate in the quenching and quenching step. For suppressing wavy deformation of a metal plate during quenching and quenching in Japan.   The continuous annealing according to claim 6 or 7, wherein the tension changing means makes the tension of the metal plate in the quenching and quenching process larger than the tension of the metal plate before and after the quenching and quenching process. A method for suppressing wave-like deformation of a metal plate during rapid quenching in equipment.   The continuous annealing according to claim 6 or 7, wherein the tension changing means makes the tension of the metal plate in the quenching and quenching process smaller than the tension of the metal plate before and after the quenching and quenching process. A method for suppressing wave-like deformation of a metal plate during rapid quenching in equipment. The method for suppressing wave deformation of a metal plate during rapid quenching in continuous annealing equipment according to claim 6, wherein the tension changing means is a bridle roll provided before and after the rapid quenching portion.