JPS6256931B2 - - Google Patents
Info
- Publication number
- JPS6256931B2 JPS6256931B2 JP11192683A JP11192683A JPS6256931B2 JP S6256931 B2 JPS6256931 B2 JP S6256931B2 JP 11192683 A JP11192683 A JP 11192683A JP 11192683 A JP11192683 A JP 11192683A JP S6256931 B2 JPS6256931 B2 JP S6256931B2
- Authority
- JP
- Japan
- Prior art keywords
- cooling tank
- temperature
- molten salt
- steel wire
- refrigerant
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000001816 cooling Methods 0.000 claims description 61
- 229910000831 Steel Inorganic materials 0.000 claims description 29
- 239000010959 steel Substances 0.000 claims description 29
- 239000000463 material Substances 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 16
- 239000003507 refrigerant Substances 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 11
- 230000003197 catalytic effect Effects 0.000 claims 1
- 150000003839 salts Chemical class 0.000 description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 230000008859 change Effects 0.000 description 5
- 230000004044 response Effects 0.000 description 4
- 239000000498 cooling water Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010411 cooking Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005098 hot rolling Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000004043 responsiveness Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
- C21D9/573—Continuous furnaces for strip or wire with cooling
- C21D9/5732—Continuous furnaces for strip or wire with cooling of wires; of rods
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/62—Quenching devices
- C21D1/63—Quenching devices for bath quenching
- C21D1/64—Quenching devices for bath quenching with circulating liquids
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Control Of Heat Treatment Processes (AREA)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Description
本発明は、熱間圧延機と隣接して設けられる鋼
線材直接熱処理設備、即ち圧延後の鋼線材を冷媒
と直触熱交換する熱処理設備の制御方法に関し、
運転条件変更のために鋼線材の搬送が短時間途切
れる場合でも冷媒の温度を好適に制御できるよう
にしたものである。
溶融塩などの冷媒（以下、冷媒として溶融塩を
例にとつて説明する）による鋼材の熱処理方法で
は、従来は溶融塩の取扱量自体が桁違いに小さか
つたため、溶融塩の加熱・冷却ともその制御が技
術的に問題とならず、加熱は電気ヒータで行い、
冷却は冷却槽自体の外面を空冷する程度で十分で
あつた。
ところが、鋼材の処理量が昨今の如く多くなる
と、熱い鋼材により溶融塩中に持ち込まれる熱量
が非常に大きいものとなり、空冷程度では冷却能
力不足となつてしまつた。そこで、溶融塩を循環
し冷却する装置が、鋼材冷却装置とは別に必要と
なつていた。
第１図は、上述した鋼材の熱処理における溶融
塩の循環・冷却を適用した鋼線材の直接熱処理設
備を示す。第１図において、１は熱間圧延後の約
800℃の鋼線材であり、第２図に示す如くループ
状にして冷却槽２中に浸漬され、冷却槽に貯留し
た冷媒例えば溶融塩３によつて所定の温度例えば
約500℃まで冷却される。この場合、溶融塩３は
逆に鋼線材１の顕熱によつて加熱されるので、ポ
ンプ４によつて冷却槽２と熱交換器５間に溶融塩
３を循環させ、熱交換器５において水６などと熱
交換させて冷却している。
第１図のような鋼線材直接熱処理設備の制御装
置としては、第３図に示すような温度制御装置が
特願昭57−228496号として既に出願されている。
第３図の温度制御装置は、後述する熱バランス
式(1)から得られる式(2)により冷却槽入側溶融塩温
度の目標値Ｔ2Iを演算により求め、又は式(3)から
冷却槽内溶融塩温度の目標値T2を演算で求め、
これらの目標値Ｔ2IあるいはT2となるように溶
融塩温度を制御する装置である。具体的には、
演算器１２に式(2)あるいは式(3)を演算するに必
要な運転条件のデータをインプツトし、Ｔ2I又は
T2といつた温度目標値を演算させ、この目標値
を溶融塩温度制御装置７に設定値として与える。
第３図の例では、７は熱交換器５から戻つてくる
冷却槽入側溶融塩の温度制御装置であり、温度検
出器８によつて検出された冷却槽入側溶融塩温度
が演算器１２の出力である冷却槽入側溶融塩温度
の目標値Ｔ2Iになるように、熱交換器５の給水流
量制御装置９の設定値を調節する。この給水流量
制御装置９は、流量検出器１０によつて検出され
た給水流量がその設定値となるように、給水弁１
１を制御する。
Ｔ2I＝ｆ（ｄ、ｖ、Ｔ1O） ……式(2)
T2＝ｆ（ｄ、ｖ、Ｔ1O） ……式(3)
ここでα：溶融塩と線材の熱伝達率
Ａ：線材表面積（線材処理量、速度、線
径の関数）
C1：線材の比熱
C2：溶融塩の比熱
W1：線材処理量
W2：溶融塩循環流量
Ｔ1I：冷却槽入側における線材温度
Ｔ1O： 〃 出側 〃
Ｔ2I： 〃 入側溶融塩温度
T2：冷却槽内側溶融塩度
Δtm：
The present invention relates to a method for controlling a steel wire direct heat treatment facility installed adjacent to a hot rolling mill, that is, a heat treatment facility that directly catalytically exchanges heat between a rolled steel wire and a refrigerant.
This allows the temperature of the refrigerant to be suitably controlled even when the conveyance of the steel wire rod is interrupted for a short time due to a change in operating conditions. In the heat treatment method for steel materials using a refrigerant such as molten salt (hereinafter, we will explain using molten salt as an example of refrigerant), the amount of molten salt itself handled was an order of magnitude smaller, so heating and cooling of the molten salt was difficult. There is no technical problem in controlling it, and heating is done with an electric heater.
Air cooling of the outer surface of the cooling tank itself was sufficient. However, as the amount of steel processed has increased in recent years, the amount of heat carried into the molten salt by the hot steel has become extremely large, and air cooling has become insufficient in its cooling capacity. Therefore, a device for circulating and cooling the molten salt was required in addition to the steel material cooling device. FIG. 1 shows a direct heat treatment facility for steel wire rods to which the above-described circulation and cooling of molten salt in the heat treatment of steel materials is applied. In Figure 1, 1 is approximately
It is a steel wire at 800°C, and as shown in Fig. 2, it is looped and immersed in a cooling tank 2, and is cooled to a predetermined temperature, for example, about 500°C, by a refrigerant, such as a molten salt 3, stored in the cooling tank. . In this case, the molten salt 3 is conversely heated by the sensible heat of the steel wire 1, so the molten salt 3 is circulated between the cooling tank 2 and the heat exchanger 5 by the pump 4, and the molten salt 3 is circulated between the cooling tank 2 and the heat exchanger 5. It is cooled by exchanging heat with water 6 etc. As a control device for a steel wire direct heat treatment facility as shown in FIG. 1, a temperature control device as shown in FIG. 3 has already been filed as Japanese Patent Application No. 57-228496. The temperature control device shown in FIG. Calculate the target value T 2 of the internal molten salt temperature,
This device controls the molten salt temperature so that it reaches these target values T 2I or T 2 . Specifically, the operating condition data required to calculate equation (2) or equation (3) is input into the calculator 12, and T 2I or
A temperature target value such as T 2 is calculated, and this target value is given to the molten salt temperature control device 7 as a set value.
In the example shown in FIG. 3, 7 is a temperature control device for the molten salt at the entrance side of the cooling tank that returns from the heat exchanger 5, and the temperature of the molten salt at the entrance side of the cooling tank detected by the temperature detector 8 is calculated by the computer. The setting value of the water supply flow rate control device 9 of the heat exchanger 5 is adjusted so that the temperature of the molten salt at the entrance side of the cooling tank becomes the target value T 2I , which is the output of step 12. This water supply flow rate control device 9 controls the water supply valve 1 so that the water supply flow rate detected by the flow rate detector 10 becomes the set value.
Control 1. T 2I = f (d, v, T 1O ) ...Formula (2) T 2 = f (d, v, T 1O ) ...Formula (3) where α: Heat transfer coefficient between molten salt and wire A: Wire surface area (function of wire throughput, speed, and wire diameter) C 1 : Specific heat of wire C 2 : Specific heat of molten salt W 1 : Wire throughput W 2 : Molten salt circulation flow rate T 1I : Wire temperature at the entrance side of the cooling tank T 1O : 〃 Output side 〃 T 2I : 〃 Inlet side molten salt temperature T 2 : Cooling tank inside molten salt degree Δtm:
【式】
ＱL：熱損失
Q2：熱交換器による冷却量
ｄ：線径
ｖ：線材速度
しかし、第３図のような制御系では、鋼線材１
自体を加熱源として考えているため、短時間でも
鋼線材１の搬送が途切れると制御が誤つてしま
う。即ち、運転条件が変化する場合例えば線径が
変わる場合は、線径圧延機のロール組替えのため
に数十分程度、線材が搬送されてこない空き時間
が生じる。この間は、冷却槽２に対する加熱源で
ある鋼線材がなくなるため、冷却槽内溶融塩温度
が大きく下つてしまう。第４図は、冷却槽入側溶
融塩温度を一定と仮定し、鋼線材尻抜け後の冷却
槽内溶融塩温度の応答を計算した例を示す。これ
によると、温度降下率は約２〜３℃／minであ
る。
上述した温度降下を防ぐには、熱交換器５での
抜熱をなくす必要がある。ところが、例えば冷却
水の供給を停止するならば、約400〜500℃といつ
た高温溶融塩による熱交換器５の空炊き、という
問題が生じてしまう。そのため、空炊きを防止で
きる最低限の抜熱量が必要であり、溶融塩温度制
御装置７には低流量側に対するリミツタ即ちロー
リミツタ機能を付設せねばならない。一方、溶融
塩３の循環を停止するならば、熱交換器５内で滞
留する溶融塩の凝固といつた問題が生じてしま
う。
なお、前述の空炊き防止の最低抜熱量以上の容
量を持つ加熱源、例えば電気ヒータを用意すれ
ば、溶融塩温度降下の問題はなくなる。しかし、
１日に数回しかない線径変更などのために大容量
のヒータを常備することはオーバースペツク（過
剰仕様）であり、同時に省エネルギーに反する。
本発明は上述した事情に基づき、鋼線材処理の
短時間停止時において、
(a) 溶融塩の循環も冷却水の供給も停止すること
なく、
(b) できるだけ冷却槽内溶融塩温度を下げず、
(c) 更に、鋼線材処理の再開時にはできるだけ早
く冷却槽内溶融塩温度を所定値に制御すること
ができるような、
制御方法を提供することを目的とする。
この目的を達成する本発明の鋼線材直接熱処理
設備の制御方法は、
(i) 先行する鋼線材（先行材という）の終端が冷
却槽を通過すると同時に、冷却槽入側溶融塩温
度制御系の温度設定値として、後行する鋼線材
（後行材という）に対して算出した冷却槽内溶
融塩温度の目標値を与えること、
(ii) 鋼線材の搬送が再開された場合は、後行材の
先端が冷却槽を通過し且つ冷却槽内溶融塩温度
検出値が〔目標値−許容制御偏差〕以上になる
と、同時に通常運転通り冷却槽入側溶融塩温度
制御系の設定値として後行材に対して算出した
冷却槽入側溶融塩温度の目標値を与えること、
を技術的思想の基礎とする。
以下、第５図及び第６図により本発明を説明す
る。
第５図は本発明の制御方法を実現する制御装置
の一構成例を示し、第１図、第３図と同部材には
同符号を付し説明の重複を省く。同図中の符号１
３は冷却槽内溶融塩温度の検出器である。演算器
１４は第３図に示した演算器１２の機能に加え、
本発明方法の処理に必要な演算機能を備える。即
ち、前式(2)による冷却槽入側溶融塩温度Ｔ2Iの算
出及び前式(3)による冷却槽内溶融塩温度T2の算
出をともに行う。
今、先行材が冷却処理されているとすると、演
算器１４からは、この先行材に関する運転条件の
データインプツトにより算出された冷却槽入側の
目標値Ｔ2Iが冷却槽入側溶融塩温度制御装置７に
その設定値として与えられており、検出器８の検
出温度がＴ2Iとなるように即ち第３図と同じよう
に給水流量制御装置９、流量検出器１０及び給水
弁１１からなる流量調節系が制御される。
線径変更等の運転条件の変更により上述した先
行材の終端が冷却槽２を通過すると、演算器１４
が後行材に関する運転条件のインプツトデータに
より算出した冷却槽内の目標値T2がＴ2Iの代り
に、温度制御装置７にその設定値として与えられ
る。従つて、検出器８の検出温度がT2となるよ
うに流量調節系が制御される。これにより、熱交
換器５への給水及び溶融塩の循環を行いつつ、抜
熱量をできるだけ抑えることができる。なお、Ｔ
2IからT2への設定値の変更は、熱処理ラインの
動きを見て運転員が手動で指令しても良く、ある
いは先行材の終端通過を検出する適当な検出器を
用い、その検出信号を取り入れて自動的に行つて
も良い。
次に後行材の搬送が再開されると、後行材の先
端が冷却槽２を通過し且つ検出器１３により検出
された冷却槽内溶融塩温度が
〔目標値T2−許容制御偏差〕
即ち許容最低温度以上になつたことを条件とし
て、演算器１４が算出した後行材に対する冷却槽
入側の目標値Ｔ2IがT2の代りに温度制御装置７
の設定値として与えられる。これにより、検出器
８の温度が新らなＴ2Iとなるように制御される。
この場合、T2からＴ2Iへの設定値変更に必要な
後行材先端の通過は、運転員が処理ラインを見て
検出しても良く、あるいは適当な検出器で自動的
に検出しても良い。また、許容最低温度に対する
監視は、温度偏差を表示器に表示し運転員がこれ
を見て行つても良く、あるいは演算器１４に判定
機能を持たせても良い。
ここで、線材処理再開後に冷却槽内溶融塩温度
検出値が許容最低温度以上になるまでは冷却槽入
側の温度制御装置７の設定値をＴ2Iまで下げない
理由は次の通りである。
即ち、もし空き時間が長くなつて線材処理再開
時に冷却槽内溶融塩温度が大きく下つた場合、熱
交換器５による抜熱量を抑えながら線材顕熱によ
つて冷却槽内溶融塩温度をできるだけ早く上昇さ
せるためである。このような冷却槽内溶融塩温度
の高応答性により、線材処理再開と同時に設定値
をＴ2Iの如く下げるよりも、歩留の低下が少なく
なる。
第６図に、第５図の制御系に本発明方法を適用
した場合の応答特性の計算例を示す。但し、第６
図では先行材の槽内目標値の方が後行材の槽内目
標値より大きいものと仮定している。なお、第６
図中ｃとｄは許容偏差である。
第６図によれば、線材処理の短時間停止期間Ｓ
において熱交換器５の最低抜熱量によつて冷却槽
内溶融塩温度が徐々に下がるのは避けられない
が、第４図に示した従来の場合に比べ、その温度
降下率が0.4〜0.6℃／minと大幅に小さくなつ
た。また、運転再開時には後行材の顕熱を活用し
ているので、冷却槽内溶融塩温度が高応答化し、
歩留りが大幅に向上した。[Formula] Q L : Heat loss Q 2 : Cooling amount by heat exchanger d: Wire diameter v: Wire speed However, in the control system as shown in Fig. 3, steel wire 1
Since the wire rod itself is considered as a heating source, if the conveyance of the steel wire rod 1 is interrupted even for a short time, the control will be erroneous. That is, when the operating conditions change, for example when the wire diameter changes, there is a vacant time of about several tens of minutes during which the wire is not transported due to the roll rearrangement of the wire diameter rolling mill. During this time, the steel wire rod serving as the heating source for the cooling tank 2 is no longer present, so the temperature of the molten salt in the cooling tank drops significantly. FIG. 4 shows an example in which the response of the temperature of the molten salt in the cooling tank after the steel wire bottom falls out is calculated, assuming that the molten salt temperature on the entrance side of the cooling tank is constant. According to this, the temperature drop rate is about 2 to 3°C/min. In order to prevent the temperature drop mentioned above, it is necessary to eliminate heat removal from the heat exchanger 5. However, if the supply of cooling water is stopped, for example, a problem arises in that the heat exchanger 5 runs dry due to the high temperature molten salt at about 400 to 500°C. Therefore, a minimum amount of heat removal is required to prevent dry cooking, and the molten salt temperature control device 7 must be provided with a limiter, that is, a low limiter function for the low flow rate side. On the other hand, if the circulation of the molten salt 3 is stopped, problems such as solidification of the molten salt remaining in the heat exchanger 5 will occur. Note that if a heating source, such as an electric heater, having a capacity greater than the minimum amount of heat removed to prevent dry cooking is provided, the problem of the temperature of the molten salt falling will be eliminated. but,
Having a large-capacity heater on hand for changing the wire diameter only a few times a day is over-specification, and at the same time goes against energy conservation. Based on the above-mentioned circumstances, the present invention is designed to: (a) do not stop the circulation of molten salt or the supply of cooling water; and (b) keep the temperature of the molten salt in the cooling tank as low as possible when steel wire processing is stopped for a short time. (c) Furthermore, it is an object of the present invention to provide a control method that can control the temperature of the molten salt in the cooling tank to a predetermined value as soon as possible when steel wire processing is restarted. The method for controlling the steel wire direct heat treatment equipment of the present invention that achieves this objective is as follows: (i) At the same time as the end of the preceding steel wire (referred to as the preceding material) passes through the cooling tank, the molten salt temperature control system at the entrance of the cooling tank is controlled. As the temperature setting value, give the target value of the temperature of the molten salt in the cooling tank calculated for the following steel wire rod (referred to as the following material); (ii) When the conveyance of the steel wire rod is resumed, When the tip of the material passes through the cooling tank and the detected value of the temperature of the molten salt in the cooling tank exceeds [target value - allowable control deviation], the setting value of the molten salt temperature control system on the entrance side of the cooling tank is set as normal operation. The basis of the technical idea is to provide a target value for the molten salt temperature at the entrance of the cooling tank calculated for the material. The present invention will be explained below with reference to FIGS. 5 and 6. FIG. 5 shows an example of the configuration of a control device that implements the control method of the present invention, and the same members as in FIGS. 1 and 3 are given the same reference numerals to avoid redundant explanation. Code 1 in the same figure
3 is a detector for the temperature of the molten salt in the cooling tank. In addition to the functions of the calculator 12 shown in FIG. 3, the calculator 14 has the following functions:
Equipped with calculation functions necessary for processing the method of the present invention. That is, the molten salt temperature T 2I on the entrance side of the cooling tank is calculated using the above equation (2), and the molten salt temperature T 2 inside the cooling tank is calculated using the above equation (3). Now, assuming that the preceding material is being cooled, the computing unit 14 calculates the target value T2I on the cooling tank inlet side, which is calculated from the data input of the operating conditions regarding this preceding material, as the molten salt temperature on the cooling tank inlet side. The set value is given to the control device 7, and the temperature detected by the detector 8 is set to T2I . A flow regulation system is controlled. When the end of the preceding material passes through the cooling tank 2 due to a change in operating conditions such as a change in wire diameter, the arithmetic unit 14
The target value T 2 in the cooling tank calculated from the input data of the operating conditions regarding the trailing material is given to the temperature control device 7 as its set value instead of T 2I . Therefore, the flow rate adjustment system is controlled so that the temperature detected by the detector 8 becomes T2 . Thereby, the amount of heat removed can be suppressed as much as possible while supplying water to the heat exchanger 5 and circulating the molten salt. In addition, T
The setting value can be changed from 2I to T 2 by the operator manually observing the movement of the heat treatment line, or by using an appropriate detector that detects the passing of the end of the preceding material and transmitting the detection signal. You can also import it and do it automatically. Next, when the conveyance of the trailing material is resumed, the leading end of the trailing material passes through the cooling tank 2, and the temperature of the molten salt in the cooling tank detected by the detector 13 becomes [Target value T 2 - permissible control deviation] That is, on the condition that the temperature has exceeded the allowable minimum temperature, the target value T2I of the cooling tank entry side for the trailing material calculated by the calculator 14 is changed to the temperature control device 7 instead of T2 .
is given as the setting value. Thereby, the temperature of the detector 8 is controlled to become the new T 2I .
In this case, the passage of the leading edge of the trailing material required to change the set value from T 2 to T 2I can be detected by an operator by looking at the processing line, or automatically detected by an appropriate detector. Also good. Further, the minimum allowable temperature may be monitored by displaying the temperature deviation on a display and having the operator look at it, or by providing the computing unit 14 with a determination function. Here, the reason why the set value of the temperature control device 7 on the entrance side of the cooling tank is not lowered to T 2I until the detected value of the temperature of the molten salt in the cooling tank becomes equal to or higher than the allowable minimum temperature after restarting the wire processing is as follows. In other words, if the idle time becomes long and the temperature of the molten salt in the cooling tank drops significantly when wire processing is resumed, the temperature of the molten salt in the cooling tank is reduced as quickly as possible using sensible heat from the wire while suppressing the amount of heat removed by the heat exchanger 5. This is to raise the temperature. Due to such high responsiveness of the temperature of the molten salt in the cooling tank, the decrease in yield is smaller than when the set value is lowered to T 2I at the same time as wire processing is restarted. FIG. 6 shows an example of calculation of response characteristics when the method of the present invention is applied to the control system of FIG. 5. However, the 6th
In the figure, it is assumed that the in-tank target value of the preceding material is larger than the in-tank target value of the succeeding material. In addition, the 6th
In the figure, c and d are allowable deviations. According to FIG. 6, the short stop period S for wire processing
Although it is inevitable that the temperature of the molten salt in the cooling tank gradually decreases due to the minimum amount of heat removed by the heat exchanger 5, the rate of temperature decrease is 0.4 to 0.6 degrees Celsius compared to the conventional case shown in FIG. /min. In addition, when restarting operation, the sensible heat of the trailing material is utilized, so the molten salt temperature in the cooling tank becomes highly responsive.
Yield has been significantly improved.
第１図は線材直接熱処理設備の基本的構成図、
第２図は搬送される線材の斜視図、第３図は既に
提案した線材直接熱処理設備の制御装置の構成
図、第４図の従来の制御方法における応答計算例
のグラフ、第５図は本発明方法を実現する制御装
置の一例を示す構成図、第６図は本発明方法にお
ける応答計算例のグラフである。
図面中、１は鋼線材、２は冷却槽、３は溶融塩
（冷媒）、４はポンプ、５は熱交換器、６は冷却
水、７は冷却槽入側溶融塩の温度制御装置、８は
温度検出器、９は給水流量制御装置、１０は流量
検出器、１１は給水弁、１３は温度検出器、１４
は演算器である。
Figure 1 is a basic configuration diagram of wire direct heat treatment equipment.
Fig. 2 is a perspective view of the wire rod being transported, Fig. 3 is a configuration diagram of the control device for the wire direct heat treatment equipment that has already been proposed, Fig. 4 is a graph of an example of response calculation in the conventional control method, and Fig. 5 is the book of this book. FIG. 6 is a block diagram showing an example of a control device that implements the method of the invention, and is a graph of an example of response calculation in the method of the invention. In the drawing, 1 is a steel wire rod, 2 is a cooling tank, 3 is a molten salt (refrigerant), 4 is a pump, 5 is a heat exchanger, 6 is a cooling water, 7 is a temperature control device for the molten salt at the entrance of the cooling tank, 8 9 is a temperature detector, 9 is a water supply flow rate control device, 10 is a flow rate detector, 11 is a water supply valve, 13 is a temperature detector, 14
is an arithmetic unit.
Claims (1)
冷媒と直触熱交換することによつて冷却する鋼線
材冷却装置と、冷媒を前記冷却槽との間で循環し
て冷却する熱交換器と、この熱交換器から冷却槽
に供給される冷媒の温度即ち冷却槽入側冷媒温度
を設定値に制御する制御装置とを備える鋼線材直
接熱処理設備の制御方法において、運転条件変更
のために鋼線材の搬送が途切れるに際し、先行材
の終端が前記冷却槽を通過した以後は後行材の運
転条件により算出した冷却槽内冷媒温度の目標値
を前記制御装置の設定値とし、鋼線材の搬送が再
開された後は後行材の先端が冷却槽を通過し且つ
冷却槽内冷媒温度の検出値が許容最低温度以上に
なつた以後に前記制御装置の設定値として後行材
の運転条件により算出した冷却槽入側冷媒温度の
目標値を与えることを特徴とする鋼線材直接熱処
理設備の制御方法。1. A steel wire cooling device that cools hot-rolled steel wire by direct catalytic heat exchange with a refrigerant stored in a cooling tank, and a heat exchanger that cools the hot-rolled steel wire by circulating the refrigerant between the cooling tank and the cooling tank. and a control device for controlling the temperature of the refrigerant supplied from the heat exchanger to the cooling tank, that is, the temperature of the refrigerant at the entrance of the cooling tank, to a set value. When the conveyance of the steel wire is interrupted, after the end of the preceding material passes through the cooling tank, the target value of the refrigerant temperature in the cooling tank calculated based on the operating conditions of the succeeding material is set as the setting value of the control device, and the steel wire is After the conveyance of the trailing material is resumed, the operation of the trailing material is set as the setting value of the control device after the leading end of the trailing material passes through the cooling tank and the detected value of the refrigerant temperature in the cooling tank becomes equal to or higher than the allowable minimum temperature. A method for controlling direct heat treatment equipment for steel wire rods, characterized in that a target value of a refrigerant temperature on the entrance side of a cooling tank is given based on conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11192683A JPS605823A (en) | 1983-06-23 | 1983-06-23 | Controlling method of direct heat treating installation for steel wire rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11192683A JPS605823A (en) | 1983-06-23 | 1983-06-23 | Controlling method of direct heat treating installation for steel wire rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS605823A JPS605823A (en) | 1985-01-12 |
| JPS6256931B2 true JPS6256931B2 (en) | 1987-11-27 |
Family
ID=14573579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11192683A Granted JPS605823A (en) | 1983-06-23 | 1983-06-23 | Controlling method of direct heat treating installation for steel wire rod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS605823A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4890159B2 (en) * | 2006-09-05 | 2012-03-07 | 新日本製鐵株式会社 | Molten salt piping and heat treatment method |
| JP2014148731A (en) * | 2013-02-04 | 2014-08-21 | Kobe Steel Ltd | Operation support system for heat treatment furnace |
-
1983
- 1983-06-23 JP JP11192683A patent/JPS605823A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS605823A (en) | 1985-01-12 |
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