JP5547903B2 - Method and apparatus for cooling ring-shaped hot rolled wire rod - Google Patents

Method and apparatus for cooling ring-shaped hot rolled wire rod Download PDF

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JP5547903B2
JP5547903B2 JP2009082484A JP2009082484A JP5547903B2 JP 5547903 B2 JP5547903 B2 JP 5547903B2 JP 2009082484 A JP2009082484 A JP 2009082484A JP 2009082484 A JP2009082484 A JP 2009082484A JP 5547903 B2 JP5547903 B2 JP 5547903B2
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heater
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良太 中西
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Kobe Steel Ltd
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Description

本発明は、リング状熱間圧延線材の冷却方法およびその装置に関する。   The present invention relates to a ring-shaped hot rolled wire rod cooling method and apparatus.

熱間圧延後の移送方向に所定ピッチでリング間のずれの存在するリング状熱間圧延線材をステルモアタイプの冷却装置上をコンベアで移送しながら、このリング状熱間圧延線材の密部と疎部を均一に徐冷しようとする技術が開示されている（特許文献１参照）。   While transporting the ring-shaped hot rolled wire having a gap between the rings at a predetermined pitch in the transfer direction after hot rolling on a stealmore type cooling device, the dense portion of the ring-shaped hot rolled wire A technique for uniformly cooling the sparse part is disclosed (see Patent Document 1).

特開平１１−３３５７４３号公報JP-A-11-335743

上記特許文献１の図１および図４に開示された徐冷装置では、コンベア上に載置されたリング状熱間圧延線材を覆う長い保温カバーが設けられている。したがって、リング状熱間圧延線材の密部を冷却するための空気が供給された場合、上記保温カバーで覆われた内部は実質的に閉空間に近いため、多量の冷却用空気はその逃げ場を失う。よって、この多量の冷却用空気は、上記閉空間内を循環し、かつ、乱れた流れとなり、上記リング状熱間圧延線材の温度分布の正確な制御が不能となるばかりか、上記リング状熱間圧延線材の疎部を冷却してしまうという問題があった。   In the slow cooling apparatus disclosed in FIG. 1 and FIG. 4 of the above-mentioned Patent Document 1, a long heat insulating cover that covers the ring-shaped hot-rolled wire placed on the conveyor is provided. Therefore, when air for cooling the dense part of the ring-shaped hot-rolled wire is supplied, the interior covered with the heat insulating cover is substantially close to the closed space. lose. Therefore, this large amount of cooling air circulates in the closed space and becomes a turbulent flow, which not only makes it impossible to accurately control the temperature distribution of the ring-shaped hot-rolled wire, but also the ring-shaped heat. There was a problem that the sparse part of the hot rolled wire rod was cooled.

また、上記特許文献１の図７に開示された徐冷装置では、保温カバーに排気ダクトが設置され、この排気ダクトに排気ブロアを接続する構成になっている。このような構成を採用することで、上記問題は多少軽減するが、排気ダクトや排気ブロアのような大掛かりな設備を要するため、この設備を移動させるのは困難である。したがって、リング状熱間圧延線材の疎部を保温するためのヒータをコンベアから取り外すことが出来ないばかりか、この疎部を空気で冷却出来ない。すなわち、上記徐冷装置のままでは、リング状熱間圧延線材の急冷に対応させることが出来ないという問題点が生じた。   Moreover, in the slow cooling apparatus disclosed by FIG. 7 of the said patent document 1, an exhaust duct is installed in a heat insulation cover, and it is the structure which connects an exhaust blower to this exhaust duct. By adopting such a configuration, the above problem is somewhat reduced. However, since a large facility such as an exhaust duct or an exhaust blower is required, it is difficult to move the facility. Therefore, the heater for keeping the sparse part of the ring-shaped hot rolled wire cannot be removed from the conveyor, and the sparse part cannot be cooled with air. That is, there is a problem that the slow cooling apparatus cannot cope with the rapid cooling of the ring-shaped hot rolled wire rod.

本発明の目的は、リング状熱間圧延線材の密部と疎部の各冷却速度を目標とする所定冷却速度に対して所定偏差内に収まるような徐冷が可能であり、かつ、急冷への対応力も有したリング状熱間圧延線材の冷却方法およびその装置を提供することにある。   An object of the present invention is to allow slow cooling so as to be within a predetermined deviation with respect to a predetermined cooling rate with respect to each cooling rate of the dense part and the sparse part of the ring-shaped hot rolled wire rod, and to rapid cooling Another object of the present invention is to provide a method and apparatus for cooling a ring-shaped hot-rolled wire rod having the above-mentioned ability.

この目的を達成するために、本発明の請求項１に記載の発明は、
冷却用空気噴出孔を有したデッキと、移送方向に所定ピッチでリング間のずれの存在するリング状熱間圧延線材を前記リング状熱間圧延線材の全体を覆うような保温カバーなしに移送するための前記デッキ上に設けられたコンベアと、を備えたリング状熱間圧延線材の冷却装置におけるリング状熱間圧延線材の冷却方法であって、
前記リング状熱間圧延線材の疎部と前記デッキとの間には取り外し可能な前記冷却用空気噴出孔を塞ぐための封鎖部材と前記疎部を保温するためのヒータが設置され、
予め前記ヒータの表面温度が目標とする所定表面温度となるように前記ヒータの出力を調節する工程と、
前記リング状熱間圧延線材が前記コンベア上に通材された場合は、前記リング状熱間圧延線材の密部を放冷または、前記冷却用空気噴出孔から噴出される空気で目標とする所定冷却速度に対して所定偏差内に収まるように冷却するとともに、
前記リング状熱間圧延線材の疎部の冷却速度が前記目標とする所定冷却速度に対して所定偏差内に収まるように前記ヒータの出力を調節する工程と、
を有したことを特徴とするリング状熱間圧延線材の冷却方法である。 In order to achieve this object, the invention according to claim 1 of the present invention provides:
A deck having cooling air ejection holes and a ring-shaped hot-rolled wire having a gap between the rings at a predetermined pitch in the transport direction are transported without a heat insulating cover that covers the entire ring-shaped hot-rolled wire. A cooling method for a ring-shaped hot rolled wire in a cooling device for a ring-shaped hot rolled wire provided with a conveyor provided on the deck for
Between the sparse part of the ring-shaped hot-rolled wire rod and the deck, a sealing member for closing the cooling air ejection hole and a heater for keeping the sparse part are installed are installed,
Adjusting the output of the heater in advance so that the surface temperature of the heater becomes a target surface temperature,
When the ring-shaped hot-rolled wire rod is passed through the conveyor, the dense portion of the ring-shaped hot-rolled wire rod is allowed to cool or is targeted with air ejected from the cooling air ejection hole. While cooling so as to be within a predetermined deviation with respect to the cooling rate,
Adjusting the output of the heater so that the cooling rate of the sparse part of the ring-shaped hot rolled wire rod is within a predetermined deviation with respect to the target predetermined cooling rate;
A ring-shaped hot rolled wire rod cooling method characterized by comprising:

請求項２に記載の発明は、請求項１に記載の発明において、
前記ヒータと前記封鎖部材とは、一体化したヒータ付き断熱パネルであることを特徴とする。 The invention according to claim 2 is the invention according to claim 1,
The heater and the sealing member are an integrated heat insulating panel with a heater.

請求項３に記載の発明は、請求項１または２に記載の発明において、
前記ヒータの出力を調節する工程は、
前記ヒータの表面温度を計測するための温度計と、
データ入力部、ヒータ温度設定部とヒータ制御部を有したヒータ制御装置とを用い、
前記データ入力部に入力された前記リング状熱間圧延線材の目標とする所定冷却速度、線径およびリング間のピッチに基づき前記ヒータ温度設定部で目標とする前記ヒータの所定表面温度を算出し、このヒータ温度設定部で算出された前記目標とするヒータの所定表面温度と前記温度計で計測された前記ヒータの表面温度との差に応じて前記ヒータ制御部で前記ヒータの出力を調節するように構成されたことを特徴とする。 The invention according to claim 3 is the invention according to claim 1 or 2,
The step of adjusting the output of the heater includes:
A thermometer for measuring the surface temperature of the heater;
Using a data input unit, a heater control device having a heater temperature setting unit and a heater control unit,
A target surface temperature of the heater is calculated by the heater temperature setting unit based on a target predetermined cooling rate, a wire diameter, and a pitch between rings, which are input to the data input unit. The heater control unit adjusts the output of the heater according to the difference between the target surface temperature of the target heater calculated by the heater temperature setting unit and the surface temperature of the heater measured by the thermometer. It was configured as described above.

本発明の請求項４に記載の発明は、
冷却用空気噴出孔を有したデッキと、移送方向に所定ピッチでリング間のずれの存在するリング状熱間圧延線材を前記リング状熱間圧延線材の全体を覆うような保温カバーなしに移送するための前記デッキ上に設けられたコンベアと、を備えたリング状熱間圧延線材の冷却装置において、
前記リング状熱間圧延線材の疎部と前記デッキとの間に取り外し可能な前記冷却用空気噴出孔を塞ぐための封鎖部材と前記疎部を保温するためのヒータが設置されたことを特徴とするリング状熱間圧延線材の冷却装置である。 The invention according to claim 4 of the present invention is
A deck having cooling air ejection holes and a ring-shaped hot-rolled wire having a gap between the rings at a predetermined pitch in the transport direction are transported without a heat insulating cover that covers the entire ring-shaped hot-rolled wire. A ring-shaped hot-rolled wire rod cooling device provided with a conveyor provided on the deck for
Between the sparse part of the ring-shaped hot-rolled wire rod and the deck, a sealing member for closing the cooling air ejection hole and a heater for keeping the sparse part warm are installed. This is a cooling device for a ring-shaped hot-rolled wire rod.

請求項５に記載の発明は、請求項４に記載の発明において、
前記ヒータと前記封鎖部材とは、一体化したヒータ付き断熱パネルであることを特徴とする。 The invention according to claim 5 is the invention according to claim 4,
The heater and the sealing member are an integrated heat insulating panel with a heater.

請求項６に記載の発明は、請求項４または５に記載の発明において、
前記ヒータの表面温度を計測するための温度計と、
前記リング状熱間圧延線材の目標とする所定冷却速度、線径およびリング間のピッチを入力するためのデータ入力部と、このデータ入力部に入力された各データに基づき目標とする前記ヒータの所定表面温度を算出するためのヒータ温度設定部と、このヒータ温度設定部で算出された前記目標とするヒータの所定表面温度と前記温度計で計測された前記ヒータの表面温度との差に応じて前記ヒータの出力を調節するためのヒータ制御部とを有したヒータ制御装置と、
を備えたことを特徴とする。 The invention according to claim 6 is the invention according to claim 4 or 5,
A thermometer for measuring the surface temperature of the heater;
A data input unit for inputting a target predetermined cooling rate, a wire diameter and a pitch between rings of the ring-shaped hot rolled wire, and a target of the heater based on each data input to the data input unit According to a heater temperature setting unit for calculating a predetermined surface temperature, and a difference between the predetermined surface temperature of the target heater calculated by the heater temperature setting unit and the surface temperature of the heater measured by the thermometer A heater control device having a heater control unit for adjusting the output of the heater;
It is provided with.

以上のように、本発明に係るリング状熱間圧延線材の冷却方法によれば、
冷却用空気噴出孔を有したデッキと、移送方向に所定ピッチでリング間のずれの存在するリング状熱間圧延線材を前記リング状熱間圧延線材の全体を覆うような保温カバーなしに移送するための前記デッキ上に設けられたコンベアと、を備えたリング状熱間圧延線材の冷却装置におけるリング状熱間圧延線材の冷却方法であって、
前記リング状熱間圧延線材の疎部と前記デッキとの間には取り外し可能な前記冷却用空気噴出孔を塞ぐための封鎖部材と前記疎部を保温するためのヒータが設置され、
予め前記ヒータの表面温度が目標とする所定表面温度となるように前記ヒータの出力を調節する工程と、
前記リング状熱間圧延線材が前記コンベア上に通材された場合は、前記リング状熱間圧延線材の密部を放冷または、前記冷却用空気噴出孔から噴出される空気で目標とする所定冷却速度に対して所定偏差内に収まるように冷却するとともに、
前記リング状熱間圧延線材の疎部の冷却速度が前記目標とする所定冷却速度に対して所定偏差内に収まるように前記ヒータの出力を調節する工程と、
を有しているため、以下のような作用効果を奏する。
１）リング状熱間圧延線材の密部と疎部の各冷却速度を目標とする。
所定冷却速度に対して所定偏差内に収まるような徐冷方法を実現可能である。すなわち、脱炭を起こす範囲を避けながら、強靭鋼の軟質化を実現させる組織変態線内の領域を通過させる冷却方法が提供可能になる。
２）また、リング状熱間圧延線材の疎部とデッキとの間に設置された冷却用空気噴出孔を塞ぐための封鎖部材とリング状熱間圧延線材の疎部を保温するためのヒータは、容易に取り外し可能であるため、徐冷時に使用した前記封鎖部材とヒータを取り外すだけで、リング状熱間圧延線材の密部と疎部を空気で冷却させる急冷方法が提供可能になる。 As described above, according to the method for cooling a ring-shaped hot-rolled wire according to the present invention,
A deck having cooling air ejection holes and a ring-shaped hot-rolled wire having a gap between the rings at a predetermined pitch in the transport direction are transported without a heat insulating cover that covers the entire ring-shaped hot-rolled wire. A cooling method for a ring-shaped hot rolled wire in a cooling device for a ring-shaped hot rolled wire provided with a conveyor provided on the deck for
Between the sparse part of the ring-shaped hot-rolled wire rod and the deck, a sealing member for closing the cooling air ejection hole and a heater for keeping the sparse part are installed are installed,
Adjusting the output of the heater in advance so that the surface temperature of the heater becomes a target surface temperature,
When the ring-shaped hot-rolled wire rod is passed through the conveyor, the dense portion of the ring-shaped hot-rolled wire rod is allowed to cool or is targeted with air ejected from the cooling air ejection hole. While cooling so as to be within a predetermined deviation with respect to the cooling rate,
Adjusting the output of the heater so that the cooling rate of the sparse part of the ring-shaped hot rolled wire rod is within a predetermined deviation with respect to the target predetermined cooling rate;
Therefore, the following effects can be obtained.
1) Target the cooling rates of the dense part and the sparse part of the ring-shaped hot rolled wire rod.
It is possible to realize a slow cooling method that falls within a predetermined deviation with respect to a predetermined cooling rate. That is, it is possible to provide a cooling method that allows a region within the structural transformation line to realize softening of the tough steel while avoiding a range where decarburization occurs.
2) In addition, a sealing member for closing the cooling air blowing hole installed between the sparse part of the ring-shaped hot rolled wire and the deck and a heater for keeping the sparse part of the ring-shaped hot rolled wire Since it can be easily removed, it is possible to provide a rapid cooling method in which the dense part and the sparse part of the ring-shaped hot-rolled wire rod are cooled with air simply by removing the sealing member and the heater used during slow cooling.

また、本発明に係るリング状熱間圧延線材の冷却装置によれば、
冷却用空気噴出孔を有したデッキと、移送方向に所定ピッチでリング間のずれの存在するリング状熱間圧延線材を前記リング状熱間圧延線材の全体を覆うような保温カバーなしに移送するための前記デッキ上に設けられたコンベアと、を備えたリング状熱間圧延線材の冷却装置において、
前記リング状熱間圧延線材の疎部と前記デッキとの間に取り外し可能な前記冷却用空気噴出孔を塞ぐための封鎖部材と前記疎部を保温するためのヒータが設置されているため、以下のような作用効果を奏する。
１）リング状熱間圧延線材の密部と疎部の各冷却速度を目標とする。
所定冷却速度に対して所定偏差内に収まるような徐冷を実現可能な冷却装置が提供可能になる。すなわち、脱炭を起こす範囲を避けながら、強靭鋼の軟質化を実現させる組織変態線内の領域を通過させる冷却を実現可能な冷却装置が提供可能になる。
２）また、リング状熱間圧延線材の疎部とデッキとの間に設置された冷却用空気噴出孔を塞ぐための封鎖部材とリング状熱間圧延線材の疎部を保温するためのヒータは、容易に取り外し可能であるため、徐冷時に使用した前記封鎖部材とヒータを取り外すだけで、リング状熱間圧延線材の密部と疎部を空気で冷却させる急冷を実現可能な冷却装置とすることが可能になる。 Moreover, according to the ring-shaped hot-rolled wire cooling device according to the present invention,
A deck having cooling air ejection holes and a ring-shaped hot-rolled wire having a gap between the rings at a predetermined pitch in the transport direction are transported without a heat insulating cover that covers the entire ring-shaped hot-rolled wire. A ring-shaped hot-rolled wire rod cooling device provided with a conveyor provided on the deck for
Since a sealing member for closing the cooling air blowout hole removable between the sparse part of the ring-shaped hot-rolled wire and the deck and a heater for keeping the sparse part warm are installed, There are the following effects.
1) Target the cooling rates of the dense part and the sparse part of the ring-shaped hot rolled wire rod.
It becomes possible to provide a cooling device capable of realizing slow cooling that falls within a predetermined deviation with respect to a predetermined cooling rate. That is, it is possible to provide a cooling device that can realize cooling that passes through a region in the structure transformation line that realizes softening of the tough steel while avoiding a range where decarburization occurs.
2) In addition, a sealing member for closing the cooling air blowing hole installed between the sparse part of the ring-shaped hot rolled wire and the deck and a heater for keeping the sparse part of the ring-shaped hot rolled wire Since it is easily removable, simply removing the sealing member and heater used at the time of slow cooling makes it possible to realize a rapid cooling in which the dense and sparse portions of the ring-shaped hot rolled wire are cooled with air. It becomes possible.

本発明に係るリング状熱間圧延線材の冷却装置を含めた全ライン構成を説明するための配置図である。It is a layout for demonstrating the whole line structure including the cooling device of the ring-shaped hot rolled wire which concerns on this invention. 本発明に係るリング状熱間圧延線材の冷却装置の一実施形態を説明するための概略平面図である。It is a schematic plan view for demonstrating one Embodiment of the cooling apparatus of the ring-shaped hot rolled wire which concerns on this invention. 図２をＡ方向から見た模式正面図である。It is the model front view which looked at FIG. 2 from the A direction. 図３に示すヒータ付き断熱パネル４０の模式断面図である。It is a schematic cross section of the heat insulation panel 40 with a heater shown in FIG. 図４に示すヒータ４０ａの制御系統を説明するためのブロック図である。It is a block diagram for demonstrating the control system of the heater 40a shown in FIG. 同実施形態におけるリング状熱間圧延線材の冷却曲線図である。It is a cooling curve figure of the ring-shaped hot rolled wire in the same embodiment.

以下、本発明の一実施形態について、添付図面を参照しながら説明する。図１は本発明に係るリング状熱間圧延線材の冷却装置を含めた全ライン構成を説明するための配置図、図２は本発明に係るリング状熱間圧延線材の冷却装置の一実施形態を説明するための概略平面図、図３は図２をＡ方向から見た模式正面図、図４は図３に示すヒータ付き断熱パネル４０の模式断面図、図５は図４に示すヒータ４０ａの制御系統を説明するためのブロック図である。   Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a layout diagram for explaining the entire line configuration including a ring-shaped hot rolled wire rod cooling device according to the present invention, and FIG. 2 is an embodiment of a ring-shaped hot rolled wire rod cooling device according to the present invention. 3 is a schematic front view of FIG. 2 as viewed from the direction A, FIG. 4 is a schematic cross-sectional view of the heat-insulating panel 40 with a heater shown in FIG. 3, and FIG. 5 is a heater 40a shown in FIG. It is a block diagram for demonstrating these control systems.

図１において、１は加熱炉、２は保熱炉、３は粗列圧延機、４、５はそれぞれ第１、第２中間列圧延機、６は仕上圧延機、７は徐冷するための冷却装置である。冷却装置７は、これまでの操業においてリング状熱間圧延線材を急冷し材料の組織制御を行っている設備に創意工夫を加えたものである（詳細は、後述する）。   In FIG. 1, 1 is a heating furnace, 2 is a heat retention furnace, 3 is a coarse row rolling mill, 4 and 5 are first and second intermediate row rolling mills, 6 is a finish rolling mill, and 7 is for slow cooling. It is a cooling device. The cooling device 7 is a device in which the ring-shaped hot-rolled wire rod is rapidly cooled in the operation so far and the inventive device is added to the equipment for controlling the structure of the material (details will be described later).

次に、図２〜図４を用いて、冷却装置７について詳述する。図２〜図４おいて、１０は仕上圧延機６により仕上圧延された後、コイル状に巻き取られたリング状熱間圧延線材、２０は仕上圧延機６の下流側に設置された搬送方向に延びたデッキ、２０ａ、２０ｂはデッキ２０の両サイドに設けられた冷却用空気噴出孔、３０はデッキ２０上に設けられたリング状熱間圧延線材１０を搬送方向に移送するためのコンベア、３０ｂ、３０ａは図２においてＡ方向から見たそれぞれコンベア３０としての左側のチェーンコンベア、右側のチェーンコンベア、４０はデッキ２０上の左側のチェーンコンベア３０ｂと右側のチェーンコンベア３０ａの間に設けられた取り外し可能なヒータ付き断熱パネル、４０ａはヒータ、４０ｂはヒータ４０ａを覆うヒータカバー、４０ｃはヒータカバー４０ｂと一体化された断熱材である。   Next, the cooling device 7 will be described in detail with reference to FIGS. 2 to 4, 10 is a ring-shaped hot-rolled wire wound in a coil shape after being finish-rolled by the finish rolling mill 6, and 20 is a conveyance direction installed on the downstream side of the finish rolling mill 6. Decks 20a and 20b extending on the sides, cooling air ejection holes provided on both sides of the deck 20, 30 a conveyor for transferring the ring-shaped hot-rolled wire 10 provided on the deck 20 in the conveying direction, In FIG. 2, 30b and 30a are the left chain conveyor and the right chain conveyor as the conveyor 30 as viewed from the direction A, respectively, and 40 is provided between the left chain conveyor 30b and the right chain conveyor 30a on the deck 20. Removable insulation panel with heater, 40a is a heater, 40b is a heater cover that covers the heater 40a, and 40c is integrated with the heater cover 40b. It is a thermal material.

図２において、リング状熱間圧延線材１０の線径はφ１０ｍｍ〜φ２０ｍｍ程度である。また、仕上圧延機６により仕上圧延された後、コイル状に巻き取られたリング状熱間圧延線材１０は、デッキ２０上において移送方向（図２において矢印で示す搬送方向に同じ）に所定ピッチでリング間のずれが存在する。したがって、リング状熱間圧延線材１０のリング間を所定ピッチとなるように広げて、コンベア３０の上を搬送される。また、リング状熱間圧延線材１０の搬送方向の先端部と後端部は、線が１本であり、また、リング状熱間圧延線材１０の疎部（図３を参照）は、線が直接重ならないために冷却されやすい。ここで、疎部とは、デッキ２０の搬送方向の中心線を境に左右のリング状熱間圧延線材１０のリング径の約１/４相当の範囲を言う。また、リング状熱間圧延線材１０の密部（図３を参照）は、線が直接重なるために冷却され難い。   In FIG. 2, the wire diameter of the ring-shaped hot rolled wire rod 10 is about φ10 mm to φ20 mm. The ring-shaped hot-rolled wire 10 wound in a coil shape after being finish-rolled by the finish rolling mill 6 has a predetermined pitch in the transport direction on the deck 20 (the same as the transport direction indicated by the arrow in FIG. 2). There is a gap between the rings. Therefore, the space between the rings of the ring-shaped hot-rolled wire 10 is widened to a predetermined pitch, and is conveyed on the conveyor 30. Moreover, the front-end part and rear-end part of the conveyance direction of the ring-shaped hot-rolled wire 10 have one wire, and the sparse part (see FIG. 3) of the ring-shaped hot-rolled wire 10 has a wire. It is easy to be cooled because it does not overlap directly. Here, the sparse part refers to a range corresponding to about 1/4 of the ring diameter of the left and right ring-shaped hot-rolled wire rods 10 with the center line in the transport direction of the deck 20 as a boundary. Further, the dense portion (see FIG. 3) of the ring-shaped hot rolled wire 10 is difficult to be cooled because the wires directly overlap each other.

次に、リング状熱間圧延線材１０の冷却方法について、図２〜図４を用いながら以下に説明する。デッキ２０には、リング状熱間圧延線材１０の急冷にも対応可能とするために、冷却用空気噴出孔２０ａ、２０ｂ間（すなわち、右側のチェーンコンベア３０ａと左側のチェーンコンベア３０ｂとの隙間に対応する位置）に冷却用空気噴出孔（図示せず）が設けられている。ただし、この冷却用空気噴出孔は、ヒータ付き断熱パネル４０によって塞がれており、リング状熱間圧延線材１０の疎部に空気が当たらないようになっている。ヒータ付き断熱パネル４０は、直径がφ５ｍｍ以内のニクロム線や細いシーズヒータなどからなるヒータ４０ａと、１０〜２０ｍｍ程度の厚みを有した断熱材４０ｃと、ヒータ４０ａを覆うヒータカバー４０ｂと、を含めて全体の厚みが３０ｍｍ程度となるように構成されている。また、断熱材４０ｃは最近の熱伝導率の低い高性能の物を用いると（熱伝導率で０．０２ｋｃａｌ／ｈｍＫ）背面温度は２００℃程度まで低減できて、ヒータ４０ａの出力を小さくできる。また、断熱材４０ｃの搬送方向と直交する方向の幅は、リング状熱間圧延線材１０のリング径の１／４〜１／２程度で良い。一方、リング状熱間圧延線材１０の密部には、冷却用空気噴出孔２０ａ、２０ｂから空気が直接当たるようになっている（図３に示す矢印参照）。   Next, a method for cooling the ring-shaped hot rolled wire rod 10 will be described below with reference to FIGS. The deck 20 has a space between the cooling air ejection holes 20a and 20b (that is, in the gap between the right chain conveyor 30a and the left chain conveyor 30b) so that the ring-shaped hot rolled wire 10 can be rapidly cooled. Cooling air ejection holes (not shown) are provided at corresponding positions. However, this cooling air ejection hole is closed by the heat-insulating panel 40 with a heater so that air does not hit the sparse part of the ring-shaped hot rolled wire 10. The heat insulating panel 40 with a heater includes a heater 40a made of a nichrome wire having a diameter of 5 mm or less or a thin sheathed heater, a heat insulating material 40c having a thickness of about 10 to 20 mm, and a heater cover 40b covering the heater 40a. The total thickness is about 30 mm. Further, when a high performance material having a low thermal conductivity is used as the heat insulating material 40c (thermal conductivity is 0.02 kcal / hmK), the back surface temperature can be reduced to about 200 ° C., and the output of the heater 40a can be reduced. Moreover, the width | variety of the direction orthogonal to the conveyance direction of the heat insulating material 40c may be about 1/4 to 1/2 of the ring diameter of the ring-shaped hot-rolled wire 10. On the other hand, air directly hits the dense portion of the ring-shaped hot-rolled wire rod 10 from the cooling air ejection holes 20a and 20b (see arrows shown in FIG. 3).

また、リング状熱間圧延線材１０の疎部は、単に空気が当たらないようになっている（図３に示す矢印参照）だけでなく、この疎部をヒータ４０ａにより保温するように構成されている。よって、冷却用空気噴出孔２０ａ、２０ｂから噴出された空気は、リング状熱間圧延線材１０の密部を冷却しながらも、リング状熱間圧延線材１０全体を覆うような保温カバーがないため、前記空気がリング状熱間圧延線材１０の疎部近傍を循環し、かつ、乱れた流れとなるようなこともなく、リング状熱間圧延線材１０の温度分布の正確な制御が不能となることもないばかりか、リング状熱間圧延線材１０の疎部をいたずらに冷却してしまうという問題も発生しない。さらに、冷却用空気噴出孔２０ａ、２０ｂから噴出された空気の前記循環によるリング状熱間圧延線材１０の疎部をいたずらに冷却してしまうという問題も発生しないため、リング状熱間圧延線材１０の疎部をヒータ４０ａにより任意かつ適切に保温することが可能になる（詳細は、後述する）。したがって、本発明に係るリング状熱間圧延線材の冷却装置を用いたならば、以下のような作用効果を奏する。
１）リング状熱間圧延線材１０の密部と疎部の各冷却速度を目標とする所定冷却速度に対して所定偏差内に収まるような徐冷を実現可能な冷却方法および冷却装置が提供可能になる。すなわち、脱炭を起こす範囲を避けながら、強靭鋼の軟質化を実現させる組織変態線内の領域を通過させる冷却を実現可能な冷却方法および冷却装置が提供可能になる。
２）また、リング状熱間圧延線材１０の疎部とデッキとの間に設置された冷却用空気噴出孔（図示せず）を塞ぐための封鎖部材とリング状熱間圧延線材１０の疎部を保温するためのヒータとしてのヒータ付き断熱パネル４０は、容易に取り外し可能であるため、徐冷時に使用した前記ヒータ付き断熱パネル４０を取り外すだけで、リング状熱間圧延線材１０の密部と疎部を空気で冷却させる急冷を実現可能な冷却方法および冷却装置とすることも可能になる。 Further, the sparse part of the ring-shaped hot-rolled wire 10 is configured not only to be exposed to air (see the arrow shown in FIG. 3) but also to keep the sparse part warm by the heater 40a. Yes. Therefore, the air ejected from the cooling air ejection holes 20a and 20b does not have a heat insulation cover that covers the entire ring-shaped hot rolled wire rod 10 while cooling the dense portion of the ring-shaped hot rolled wire rod 10. The air circulates in the vicinity of the sparse part of the ring-shaped hot rolled wire 10 and does not become a turbulent flow, and accurate control of the temperature distribution of the ring-shaped hot rolled wire 10 becomes impossible. In addition, there is no problem that the sparse part of the ring-shaped hot rolled wire rod 10 is unnecessarily cooled. Furthermore, since the problem that the sparse part of the ring-shaped hot-rolled wire 10 due to the circulation of the air ejected from the cooling air ejection holes 20a, 20b is unnecessarily cooled does not occur, the ring-shaped hot-rolled wire 10 The sparse part can be arbitrarily and appropriately kept warm by the heater 40a (details will be described later). Therefore, if the ring-shaped hot-rolled wire cooling device according to the present invention is used, the following effects are obtained.
1) It is possible to provide a cooling method and a cooling device capable of realizing gradual cooling so as to be within a predetermined deviation with respect to a predetermined cooling rate for each cooling rate of the dense and sparse portions of the ring-shaped hot rolled wire rod 10 become. That is, it is possible to provide a cooling method and a cooling device that can realize cooling that passes through a region in the structure transformation line that realizes softening of the tough steel while avoiding a range where decarburization occurs.
2) Further, a sealing member for closing a cooling air ejection hole (not shown) installed between the sparse part of the ring-shaped hot rolled wire 10 and the deck, and the sparse part of the ring-shaped hot rolled wire 10 Since the heat-insulating panel 40 with a heater as a heater for keeping the temperature is easily removable, it is possible to remove the heat-insulating panel 40 with a heater used at the time of slow cooling by simply removing the heat-insulating panel 40 with a dense portion of the ring-shaped hot rolled wire 10. It is also possible to provide a cooling method and a cooling device capable of realizing rapid cooling in which the sparse part is cooled with air.

次に、リング状熱間圧延線材１０の疎部をヒータ４０ａにより任意かつ適切に保温させるための詳細な構成およびその制御方法について、以下に図５を用いて説明する。図５において、５０はリング状熱間圧延線材１０の目標とする所定冷却速度、線径およびリング間のピッチを入力するためのデータ入力部、６０はデータ入力部５０に入力された各データ（ａ）に基づき目標とするヒータ４０ａの所定表面温度（ｂ）を算出するためのヒータ温度設定部、７０は電源、８０はヒータ温度設定部６０で算出された前記目標とするヒータ４０ａの所定表面温度（ｂ）と温度計（図示せず）で計測されたヒータ４０ａの表面温度（ｃ）との差に応じてヒータ４０ａの出力（ｄ）を調節するためのヒータ制御部であり、１００はデータ入力部５０、ヒータ温度設定部６０とヒータ制御部８０から構成されたヒータ制御装置である。   Next, a detailed configuration and a control method for keeping the sparse part of the ring-shaped hot rolled wire 10 arbitrarily and appropriately by the heater 40a will be described with reference to FIG. In FIG. 5, 50 is a data input unit for inputting a target predetermined cooling rate of the ring-shaped hot-rolled wire rod 10, a wire diameter and a pitch between rings, and 60 is each data input to the data input unit 50 ( A heater temperature setting unit for calculating a predetermined surface temperature (b) of the target heater 40a based on a), 70 is a power source, 80 is a predetermined surface of the target heater 40a calculated by the heater temperature setting unit 60 A heater control unit for adjusting the output (d) of the heater 40a according to the difference between the temperature (b) and the surface temperature (c) of the heater 40a measured by a thermometer (not shown). The heater control device includes a data input unit 50, a heater temperature setting unit 60, and a heater control unit 80.

リング状熱間圧延線材１０の疎部をヒータ４０ａにより任意かつ適切に保温させるための制御方法は、リング状熱間圧延線材１０がコンベア３０上に通材される前から予めヒータ４０ａの表面温度が目標とする所定表面温度となるようにヒータ４０ａの出力（ｄ）を調節する工程と、リング状熱間圧延線材１０がコンベア３０上に通材された場合は、リング状熱間圧延線材１０の密部を冷却用空気噴出孔（２０ａ、２０ｂ）から噴出される空気（図３に示す矢印）で目標とする所定冷却速度に対して所定偏差内に収まるように冷却するとともに、リング状熱間圧延線材１０の疎部の冷却速度が前記目標とする所定冷却速度に対して所定偏差内に収まるようにヒータ４０ａの出力（ｄ）を調節する工程と、に基づく構成からなる。また、必要な冷却速度に応じて通材方向に複数のヒータに分割し、それぞれの所定温度に制御することも可能である。   The control method for keeping the sparse part of the ring-shaped hot rolled wire 10 arbitrarily and appropriately by the heater 40a is that the surface temperature of the heater 40a is preliminarily before the ring-shaped hot rolled wire 10 is passed through the conveyor 30. If the output (d) of the heater 40a is adjusted so that the target surface temperature reaches the target surface temperature, and the ring-shaped hot rolled wire 10 is passed on the conveyor 30, the ring-shaped hot rolled wire 10 The dense portion is cooled by air (arrows shown in FIG. 3) ejected from the cooling air ejection holes (20a, 20b) so as to be within a predetermined deviation with respect to the target predetermined cooling rate, and the ring-shaped heat And adjusting the output (d) of the heater 40a so that the cooling rate of the sparse part of the inter-rolled wire 10 is within a predetermined deviation with respect to the target predetermined cooling rate. Moreover, it is also possible to divide into a plurality of heaters in the material passing direction according to the required cooling rate and control each of them to a predetermined temperature.

本発明に係る冷却方法の作用効果を確証するため、以下のラボ試験を実施した。本発明例の基本構成は、図１〜図５に示す通りであり、強靭鋼の組成からなるリング状熱間圧延線材１０の線径がφ１３ｍｍ、リング間のピッチが７０ｍｍ、通材させるリング状熱間圧延線材１０の総重量は２トンとした。また、比較例としては、上記同様なリング状熱間圧延線材１０を使用し、上記特許文献１の図４に示す冷却装置の構成と近似するように上述した図１〜図５に示すリング状熱間圧延線材１０全体を覆うような保温カバーを設置した構成とした。   In order to confirm the effect of the cooling method according to the present invention, the following laboratory test was conducted. The basic configuration of the example of the present invention is as shown in FIGS. 1 to 5. The ring-shaped hot-rolled wire 10 made of a tough steel has a wire diameter of φ13 mm, a pitch between the rings of 70 mm, and a ring shape for passing the material. The total weight of the hot rolled wire rod 10 was 2 tons. Moreover, as a comparative example, the ring-shaped hot rolled wire 10 similar to the above is used, and the ring shape shown in FIGS. 1 to 5 described above is approximated to the configuration of the cooling device shown in FIG. It was set as the structure which installed the heat retention cover which covers the hot rolling wire 10 whole.

上述したような各構成により試験した結果、図６に示すように、本発明例では、脱炭範囲を避けながら、強靭鋼の軟質化を実現させる組織変態線内の領域を通過させる冷却方法が実現可能となった。すなわち、本発明に係るリング状熱間圧延線材の冷却方法によれば、目標とする所定冷却速度に対して所定偏差内に収まるような徐冷方法が実現可能である。しかし、図６に示すように、比較例（疎部）においては、脱炭範囲を回避するものの、冷却用空気噴出孔（２０ａ、２０ｂ）から噴出される空気の循環によると思われるリング状熱間圧延線材１０の過冷却により、上記強靭鋼の軟質化を実現させる組織変態線内の領域を通過させることが出来ないことが判明した。なお、本実施形態においては、リング状熱間圧延線材１０の密部を冷却用空気噴出孔（２０ａ、２０ｂ）から空気を噴出させて、目標とする所定冷却速度に対して所定偏差内に収まるように冷却する例について説明したが、必ずしもこれに限定されるものではない。例えば、上記目標とする所定冷却速度が変更され、この変更後の目標とする所定冷却速度に対応させるために、冷却用空気噴出孔（２０ａ、２０ｂ）から空気を噴出させず、上記密部を放冷させることも考えられる。   As a result of testing by each configuration as described above, as shown in FIG. 6, in the present invention example, there is a cooling method of passing through a region in the structure transformation line that realizes softening of tough steel while avoiding the decarburization range. It became feasible. That is, according to the method for cooling a ring-shaped hot-rolled wire according to the present invention, it is possible to realize a slow cooling method that falls within a predetermined deviation with respect to a target predetermined cooling rate. However, as shown in FIG. 6, in the comparative example (sparse part), although the decarburization range is avoided, the ring-shaped heat that seems to be due to the circulation of air ejected from the cooling air ejection holes (20 a, 20 b) It has been found that due to the supercooling of the cold-rolled wire rod 10, it is impossible to pass through the region in the structural transformation line that realizes the softening of the tough steel. In the present embodiment, air is ejected from the cooling air ejection holes (20a, 20b) through the dense portion of the ring-shaped hot-rolled wire rod 10 to be within a predetermined deviation with respect to a target predetermined cooling rate. Although the example which cools like this was demonstrated, it is not necessarily limited to this. For example, the target predetermined cooling rate is changed, and in order to correspond to the target predetermined cooling rate after the change, air is not jetted from the cooling air jet holes (20a, 20b), and the dense portion is It can also be allowed to cool.

１ 加熱炉
２ 保熱炉
３ 粗列圧延機
４、５ 第１、第２中間列圧延機
６ 仕上圧延機
７ 冷却装置
１０ リング状熱間圧延線材
２０ デッキ
２０ａ、２０ｂ 冷却用空気噴出孔
３０ コンベア
３０ａ、３０ｂ 右側、左側のチェーンコンベア
４０ ヒータ付き断熱パネル
４０ａ ヒータ
４０ｂ ヒータカバー
４０ｃ 断熱材
５０ データ入力部
６０ ヒータ温度設定部
７０ 電源
８０ ヒータ制御部
１００ ヒータ制御装置 DESCRIPTION OF SYMBOLS 1 Heating furnace 2 Heat retention furnace 3 Coarse rolling mill 4, 5 1st, 2nd intermediate row rolling mill 6 Finishing rolling mill 7 Cooling device 10 Ring-shaped hot rolling wire 20 Deck 20a, 20b Cooling air ejection hole 30 Conveyor 30a, 30b Right and left chain conveyors 40 Heat insulation panel with heater 40a Heater 40b Heater cover 40c Heat insulation material 50 Data input part 60 Heater temperature setting part 70 Power supply
80 Heater control unit 100 Heater control device

Claims (6)

冷却用空気噴出孔を有したデッキと、移送方向に所定ピッチでリング間のずれの存在するリング状熱間圧延線材を前記リング状熱間圧延線材の全体を覆うような保温カバーなしに移送するための前記デッキ上に設けられたコンベアと、を備えたリング状熱間圧延線材の冷却装置におけるリング状熱間圧延線材の冷却方法であって、
前記リング状熱間圧延線材の疎部と前記デッキとの間には取り外し可能な前記冷却用空気噴出孔を塞ぐための封鎖部材と前記疎部を保温するためのヒータが設置され、
予め前記ヒータの表面温度が目標とする所定表面温度となるように前記ヒータの出力を調節する工程と、
前記リング状熱間圧延線材が前記コンベア上に通材された場合は、前記リング状熱間圧延線材の密部を放冷または、前記冷却用空気噴出孔から噴出される空気で目標とする所定冷却速度に対して所定偏差内に収まるように冷却するとともに、
前記リング状熱間圧延線材の疎部の冷却速度が前記目標とする所定冷却速度に対して所定偏差内に収まるように前記ヒータの出力を調節する工程と、
を有したことを特徴とするリング状熱間圧延線材の冷却方法。 A deck having cooling air ejection holes and a ring-shaped hot-rolled wire having a gap between the rings at a predetermined pitch in the transport direction are transported without a heat insulating cover that covers the entire ring-shaped hot-rolled wire. A cooling method for a ring-shaped hot rolled wire in a cooling device for a ring-shaped hot rolled wire provided with a conveyor provided on the deck for
Between the sparse part of the ring-shaped hot-rolled wire rod and the deck, a sealing member for closing the cooling air ejection hole and a heater for keeping the sparse part are installed are installed,
Adjusting the output of the heater in advance so that the surface temperature of the heater becomes a target surface temperature,
When the ring-shaped hot-rolled wire rod is passed through the conveyor, the dense portion of the ring-shaped hot-rolled wire rod is allowed to cool or is targeted with air ejected from the cooling air ejection hole. While cooling so as to be within a predetermined deviation with respect to the cooling rate,
Adjusting the output of the heater so that the cooling rate of the sparse part of the ring-shaped hot rolled wire rod is within a predetermined deviation with respect to the target predetermined cooling rate;
A method for cooling a ring-shaped hot-rolled wire, characterized by comprising: 前記ヒータと前記封鎖部材とは、一体化したヒータ付き断熱パネルであることを特徴とする請求項１に記載のリング状熱間圧延線材の冷却方法。 The method for cooling a ring-shaped hot-rolled wire rod according to claim 1, wherein the heater and the sealing member are an integrated heat insulating panel with a heater. 前記ヒータの出力を調節する工程は、
前記ヒータの表面温度を計測するための温度計と、
データ入力部、ヒータ温度設定部とヒータ制御部を有したヒータ制御装置とを用い、
前記データ入力部に入力された前記リング状熱間圧延線材の目標とする所定冷却速度、線径およびリング間のピッチに基づき前記ヒータ温度設定部で目標とする前記ヒータの所定表面温度を算出し、このヒータ温度設定部で算出された前記目標とするヒータの所定表面温度と前記温度計で計測された前記ヒータの表面温度との差に応じて前記ヒータ制御部で前記ヒータの出力を調節するように構成されたことを特徴とする請求項１または２に記載のリング状熱間圧延線材の冷却方法。 The step of adjusting the output of the heater includes:
A thermometer for measuring the surface temperature of the heater;
Using a data input unit, a heater control device having a heater temperature setting unit and a heater control unit,
A target surface temperature of the heater is calculated by the heater temperature setting unit based on a target predetermined cooling rate, a wire diameter, and a pitch between rings, which are input to the data input unit. The heater control unit adjusts the output of the heater according to the difference between the target surface temperature of the target heater calculated by the heater temperature setting unit and the surface temperature of the heater measured by the thermometer. The method for cooling a ring-shaped hot-rolled wire rod according to claim 1 or 2, wherein the cooling method is configured as described above. 冷却用空気噴出孔を有したデッキと、移送方向に所定ピッチでリング間のずれの存在するリング状熱間圧延線材を前記リング状熱間圧延線材の全体を覆うような保温カバーなしに移送するための前記デッキ上に設けられたコンベアと、を備えたリング状熱間圧延線材の冷却装置において、
前記リング状熱間圧延線材の疎部と前記デッキとの間に取り外し可能な前記冷却用空気噴出孔を塞ぐための封鎖部材と前記疎部を保温するためのヒータが設置されたことを特徴とするリング状熱間圧延線材の冷却装置。 A deck having cooling air ejection holes and a ring-shaped hot-rolled wire having a gap between the rings at a predetermined pitch in the transport direction are transported without a heat insulating cover that covers the entire ring-shaped hot-rolled wire. A ring-shaped hot-rolled wire rod cooling device provided with a conveyor provided on the deck for
Between the sparse part of the ring-shaped hot-rolled wire rod and the deck, a sealing member for closing the cooling air ejection hole and a heater for keeping the sparse part warm are installed. To cool ring-shaped hot rolled wire rod. 前記ヒータと前記封鎖部材とは、一体化したヒータ付き断熱パネルであることを特徴とする請求項４に記載のリング状熱間圧延線材の冷却装置。   The said heater and the said sealing member are the heat insulation panels with an integrated heater, The cooling apparatus of the ring-shaped hot-rolled wire rod of Claim 4 characterized by the above-mentioned. 前記ヒータの表面温度を計測するための温度計と、
前記リング状熱間圧延線材の目標とする所定冷却速度、線径およびリング間のピッチを入力するためのデータ入力部と、このデータ入力部に入力された各データに基づき目標とする前記ヒータの所定表面温度を算出するためのヒータ温度設定部と、このヒータ温度設定部で算出された前記目標とするヒータの所定表面温度と前記温度計で計測された前記ヒータの表面温度との差に応じて前記ヒータの出力を調節するためのヒータ制御部とを有したヒータ制御装置と、
を備えたことを特徴とする請求項４または５に記載のリング状熱間圧延線材の冷却装置。 A thermometer for measuring the surface temperature of the heater;
A data input unit for inputting a target predetermined cooling rate, a wire diameter and a pitch between rings of the ring-shaped hot rolled wire, and a target of the heater based on each data input to the data input unit According to a heater temperature setting unit for calculating a predetermined surface temperature, and a difference between the predetermined surface temperature of the target heater calculated by the heater temperature setting unit and the surface temperature of the heater measured by the thermometer A heater control device having a heater control unit for adjusting the output of the heater;
The ring-shaped hot-rolled wire rod cooling device according to claim 4 or 5, characterized by comprising:
JP2009082484A 2009-03-30 2009-03-30 Method and apparatus for cooling ring-shaped hot rolled wire rod Expired - Fee Related JP5547903B2 (en)

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