JPS59185734A - Operating method of production line for pc steel bar - Google Patents
Operating method of production line for pc steel barInfo
- Publication number
- JPS59185734A JPS59185734A JP5963483A JP5963483A JPS59185734A JP S59185734 A JPS59185734 A JP S59185734A JP 5963483 A JP5963483 A JP 5963483A JP 5963483 A JP5963483 A JP 5963483A JP S59185734 A JPS59185734 A JP S59185734A
- Authority
- JP
- Japan
- Prior art keywords
- steel bar
- furnace
- line
- furnaces
- gas
- 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.)
- Granted
Links
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
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)
- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はＰＣ鋼棒（プレストレストコンクリートに用い
られる鋼棒）の製造設備のライン停止制御を行なう操業
方法に係シ、特にライン異常発生時の制御を行なうＰＣ
ｍ棒製造ラインの操業方法に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an operating method for controlling the line stoppage of manufacturing equipment for PC steel bars (steel bars used in prestressed concrete), and particularly relates to a method for controlling a PC steel bar (steel bar used for prestressed concrete) manufacturing equipment to stop the line, and in particular, to control a PC steel bar for controlling line stoppage when an abnormality occurs in the line.
This invention relates to a method of operating an m-rod manufacturing line.
一般に、ＰＣ鋼棒製造ラインにおいては鋼棒に真直性を
もたせるために鋼棒にテンションをかけながら熱処理を
行なっているが、この熱処理炉としてガス焚き炉を使用
している場合は、炉長７５；長く、昇温及び降温に時間
がかかるという特色力；ある。Generally, in a PC steel rod production line, heat treatment is performed while applying tension to the steel rod in order to give it straightness, but when a gas-fired furnace is used as the heat treatment furnace, the furnace length is 75 mm. The characteristic feature is that it is long and takes time to heat up and cool down.
従って、鋼棒の破断や設備の故障など７５り発生し非常
停止によってラインを停止した場合、ガス焚き炉中にあ
る鋼棒は停止後１０秒間前後で１０００℃程度にまで昇
温し、クリープによシ棒径７５；細まって、ついには破
断に至る。Therefore, if the line is stopped due to an emergency stop due to a breakage of a steel rod or equipment failure, the temperature of the steel rod in the gas-fired furnace will rise to about 1000°C within 10 seconds after the stop, causing creep. The diameter of the rod is 75; it becomes narrower and eventually breaks.
また、熱処理炉の前後装置における事故発生によって鋼
棒が熱処理炉前工程側で破断するような場合に、そのま
ま鋼棒の巻取シを続行すると、熱処理炉中鋼棒を含む破
断箇所以降の鋼棒力；全て巻取られてしまい１．ライン
再開のだめに再度の送シ込み、乃至は巻戻しを行なって
通線する必要力；あシ、生産性が悪いという問題がある
。In addition, if the steel rod breaks at the front end of the heat treatment furnace due to an accident in the equipment before and after the heat treatment furnace, if you continue to wind the steel rod, the steel rod after the breakage point, including the steel rod in the heat treatment furnace, will break. Rod force: All the rods are wound up. 1. If the line cannot be restarted, the wire must be re-feeded or rewound to run the wire, which causes problems such as poor productivity.
更には、熱処理炉出口側以降で鋼棒が破断した場合でも
、巻戻しを行なう必要があり、同じく夛ｉ常な時間ロス
につながる問題がある。Furthermore, even if the steel bar breaks after the exit of the heat treatment furnace, it is necessary to unwind it, which also causes a problem that leads to frequent loss of time.
本発明はこのような諸問題に鑑みてなされたもので、そ
の目的とする処は、ライン非常停止時或は鋼棒切断時の
鋼棒再通線作業をなくし、鋼棒接合の為の送り込み乃至
は巻戻し作業の軽減を図り、ラインダウンタイムの減少
を期待できるｐｃ鋼棒製造ラインの操業方法を提供する
ことにある。The present invention has been made in view of these problems, and its purpose is to eliminate the need for reintroducing steel rods during line emergency stops or cutting steel rods, and to eliminate the need for reintroducing steel rods during line emergency stops or cutting steel rods. Another object of the present invention is to provide a method of operating a PC steel bar production line that can reduce unwinding work and reduce line downtime.
即ち、本発明の要旨とする処は、異常事態発生時のライ
ン停止と共に、鋼棒へのテンション解除、燃焼ガス供給
停止、及び炉内への送風によって、ライン及び炉内に鋼
棒を通線したままの状態を維持できるようにしたＰＣ鋼
棒製造ラインの操業方法にある。That is, the gist of the present invention is to stop the line when an abnormal situation occurs, release the tension on the steel rod, stop the supply of combustion gas, and blow air into the furnace to pass the steel rod through the line and inside the furnace. The present invention is based on a method of operating a PC steel bar production line that allows the same state to be maintained.
次に、図面に基づき本発明をより詳細に説明する。Next, the present invention will be explained in more detail based on the drawings.
第１図はＰＣ鋼棒の製造ラインを示すもので、このライ
ンの上流側から説明すると、ます鋼棒１を供給するサプ
ライスタンド２があり、次に鋼棒ｌのスケール除去のだ
めのデヌケーラ−３、素線径を所定寸法にするだめの伸
線機４、スパイラル溝をつけるための異形加工付伸線機
５、ビンチロール１１、鋼棒ｌを８５０℃程度まで加熱
するだめの焼入炉６、焼入用水槽７．３６０℃程度まで
再加熱するための焼戻炉８、焼戻用水槽９がある。Figure 1 shows a production line for PC steel bars. Starting from the upstream side of this line, there is a supply stand 2 that supplies steel bars 1, and then a descaler 3 for removing scale from steel bars 1. , a wire drawing machine 4 for adjusting the wire diameter to a predetermined size, a wire drawing machine 5 for forming spiral grooves, a vinci roll 11, and a quenching furnace 6 for heating the steel rod to about 850°C. , a water tank for quenching 7. There are a tempering furnace 8 and a water tank 9 for reheating to about 360°C.
次に、鋼棒１のテンションを測定する張力測定器２７（
例えば３点ロール方式のロードセル）、前記異形加工付
伸線機５以降、焼入及び焼戻工程にある鋼棒ｌにテンシ
ョンを加えるだめの引取機１０があシ、鋼棒１を切断す
るだめの切断機１２を経て、最後尾に製品となった鋼棒
ｌを巻取るだめの巻取機１３．１４がある。これら巻取
機１３．１４は、巻取完了時に切断機１２によって切断
された鋼棒１を交互に巻取る。また、ピンチロール１１
は、起動時、伸線機５がスリップしない張力を与え、炉
内鋼棒ｌに対しては張力を弱くシ、鋼棒１の炉内断線を
防止するだめのものである。Next, a tension measuring device 27 (
For example, a three-point roll type load cell), a wire drawing machine 5 with irregular shape processing, a pulling machine 10 for applying tension to the steel bar 1 during the quenching and tempering process, and a machine for cutting the steel bar 1. After passing through the cutting machine 12, there is a winding machine 13, 14 at the end that winds up the steel rod l that has become a product. These winders 13, 14 alternately wind the steel bar 1 cut by the cutter 12 when the winding is complete. Also, pinch roll 11
When starting up, the wire drawing machine 5 applies tension to prevent it from slipping, and weakens the tension to the steel rod 1 in the furnace to prevent wire breakage of the steel rod 1 in the furnace.
第２図は本発明を実施するだめの設備の一例を示すもの
で、前記焼入炉６及び焼戻炉８には、各容積数本のバー
ナー１５が配置されている。これらバーナー１５には、
ガス枝管１６及びエアー枝管１７が接続され、夫々各バ
ーナー１５毎のバランスを取るためのガスバルブ１８及
びエアーバルブ１９が設けられている。FIG. 2 shows an example of equipment for carrying out the present invention, in which the quenching furnace 6 and the tempering furnace 8 are provided with several burners 15 for each volume. These burners 15 include
A gas branch pipe 16 and an air branch pipe 17 are connected, and a gas valve 18 and an air valve 19 are provided for balancing each burner 15, respectively.
これら各ガス枝管１６及びエアー枝管１７は、炉６．８
の各ゾーン毎（第２図では単一ゾーンのみを示す）に夫
々合流し、ガス本管２ｏ及びエア一本管２１に接続され
、各ガス本管２ｏ及びエア一本管ｚ Ｉ ニハ、夫々ガ
スコントロールバルフ２２及びエアーコントロールバル
ブ２３が配置され、炉ｆ）、８内の設・定温度及び設定
空燃比が得られるように調整することができるようにな
っている。Each of these gas branch pipes 16 and air branch pipes 17 is connected to the furnace 6.8.
(FIG. 2 shows only a single zone), respectively, and are connected to the gas main pipe 2o and the air main pipe 21, respectively. A gas control valve 22 and an air control valve 23 are arranged so that adjustments can be made to obtain a set temperature and a set air-fuel ratio in the furnace f), 8.
尚、焼入炉６及び焼戻炉８内には、ハースロール２４が
複数本配置されて鋼棒１を支持し、モーター２５によシ
ライン速度に同調してチェーン駆動されている。A plurality of hearth rolls 24 are arranged in the quenching furnace 6 and the tempering furnace 8 to support the steel rod 1, and are chain-driven by a motor 25 in synchronization with the line speed.
前記伸線機５および引取機１ｏには、可変速モーター３
０および２６が設けられ、鋼棒ｌの送シ出し速度および
引取速度即ちライン速度、を調整している。この鋼棒１
にかかるテンションを設定値になるように調整するには
、張力測定器２７でテンションを測定し、モーター２６
の回転数をモーター３０の回転数よりいくら速くするが
すなわち、送り出し速度より引取速度をいくら速くする
か調整することにより行なっている。また、鋼棒１にモ
ーター２６の駆動力を伝達するために、引取キャタピラ
−２８を油圧シリンダー２９にょシ鋼棒ｌに押付けられ
るようになっている。尚、巻取機１３．１４も引取速度
に同調してその回転数を調整している。The wire drawing machine 5 and the wire pulling machine 1o include a variable speed motor 3.
0 and 26 are provided to adjust the feeding speed and take-up speed of the steel rod I, that is, the line speed. This steel bar 1
To adjust the tension applied to the motor 26 to the set value, measure the tension with the tension measuring device 27 and adjust the tension to the set value.
This is done by adjusting how much faster the rotational speed of the motor 30 is than the rotational speed of the motor 30, that is, how much faster the take-up speed is than the delivery speed. Further, in order to transmit the driving force of the motor 26 to the steel rod 1, a take-up caterpillar 28 is pressed against the steel rod 1 by a hydraulic cylinder 29. Note that the winding machines 13 and 14 also adjust their rotational speeds in synchronization with the take-up speed.
さて、通常の操業時には、バーナー１５での燃焼ｋ ヲ
、Ｉ’／ 、Ｘ ：１７ントロールバルブ２２及びエア
ーコントロールバルブ２３の開度指示調節によって、焼
入炉６及び焼戻炉８の炉温を設定温度に々るようにして
いる。また、鋼棒１に与えるテンション量の調整は、張
力測定器２７でテンションを測定し引取機１０のモータ
ー２６の回転数を変えることによシ行なっている。尚、
各モーター２５．２６３００回転数は、設定値通りにな
るよう、全て同期されている。Now, during normal operation, the furnace temperature of the quenching furnace 6 and the tempering furnace 8 is controlled by controlling the opening of the combustion control valve 22 and the air control valve 23 in the burner 15. I try to keep it at the set temperature. Further, the amount of tension applied to the steel rod 1 is adjusted by measuring the tension with a tension measuring device 27 and changing the rotation speed of the motor 26 of the pulling machine 10. still,
The 25.26300 rpm of each motor is all synchronized to match the set value.
ここで、鋼棒ｌの切断や設備の故障などの原因によシラ
イン停止を１かける場合、非常停止ボタン（図示せず）
を押して各モーター２５．２６．３゜を停止させ、鋼棒
１の送シ出し、引取シ、及び巻取りを停止する。If the steel line is to be stopped by one time due to a break in the steel rod or equipment failure, use the emergency stop button (not shown).
Press to stop each motor 25, 26, 3°, and stop feeding, taking off, and winding the steel bar 1.
焼入炉６及び焼戻炉８では、ガスコントロールバルブ２
２が全閉になって燃焼を停止する。逆に、エアーコント
ロールバルブ２３は全開となシ、炉６．８内にバーナー
１５の焚き口から冷風を吹き込み、鋼棒１の温度上昇の
防止及び冷却を行なう。In the quenching furnace 6 and the tempering furnace 8, the gas control valve 2
2 is fully closed and combustion stops. Conversely, the air control valve 23 is fully opened and cold air is blown into the furnace 6.8 from the opening of the burner 15 to prevent the temperature of the steel rod 1 from rising and to cool it.
更に、引取機１ｏの引取キャタピラ−２８の押付けが解
除されて、鋼棒１へのテンションが解除される。Further, the pressure of the take-up caterpillar 28 of the take-up machine 1o is released, and the tension on the steel rod 1 is released.
ラインの非常停止時には、以上のような操作が自動的に
行なわれ、鋼棒ｌの温度上昇の防止、クリープによる線
径の細少化、更には切断の防止が図られる。従って、鋼
棒１の劣化部分の切取り作業、切断部接合作業、及び炉
６．８への再通線作業が不要となシ、ラインの再稼動が
容易となる。In the event of an emergency stop of the line, the above-mentioned operations are automatically carried out to prevent the temperature of the steel rod 1 from rising, to reduce the wire diameter due to creep, and to prevent the steel rod from being cut. Therefore, there is no need to cut out the degraded portion of the steel bar 1, join the cut portion, and reconnect the wire to the furnace 6.8, making it easy to restart the line.
尚、焼入炉６及び焼戻炉８の前後装置のトラブルによっ
て鋼棒１が切断するような場合にも、ライン主要部に設
けた、リミットスイッチ、或は光学センサーなど各種セ
ンサー（図示せず）によって鋼棒１の切断を検知し、直
ちに上述の如きライン停止、燃焼停止、冷風吹込み、及
びテンション解除を行なえば、炉６．８内からの鋼棒１
の通り抜け、炉内６．８の鋼棒の劣化を防止し、ライン
再稼動のだめの接合時間の短縮化が達成できる。In addition, even if the steel bar 1 breaks due to trouble in the front and rear devices of the quenching furnace 6 and tempering furnace 8, various sensors (not shown) such as limit switches or optical sensors installed in the main part of the line can be used. ) detects the cutting of the steel rod 1, and immediately stops the line, stops combustion, blows cold air, and releases the tension as described above, then the steel rod 1 is removed from the furnace 6.8.
This prevents deterioration of the steel rods in the furnace and shortens the welding time before restarting the line.
以上述べた如く、本発明に拠れば、ガス焚き炉での非常
時等に炉内の鋼棒の切断や劣化を防止して、ライン再開
の効率化を達成することができる。As described above, according to the present invention, in the event of an emergency in a gas-fired furnace, it is possible to prevent the steel rods in the furnace from being cut or deteriorated, and to achieve efficient restart of the line.
第１図はｐ、 ｃ鋼棒製造ラインの説明図、第２−図は
本発明の操業方法を実施するための設備の一例を示す説
明図である。
１・・・鋼棒、 ６・・・焼入炉、８・・・
焼戻炉、 １０・・・引取機、１５・・・バー
ナー、 １６・・・ガス枝管、１７・・・エアー枝
管、 ２０・・・ガス本管、２１・・・エアー木管、
２２・・・ガスコントロールバルブ、
２３・・・エアーコントロールバルブ、２７・・・張力
測定器、
２８・・・引取キャタピラ−６FIG. 1 is an explanatory diagram of a P and C steel bar manufacturing line, and FIG. 2 is an explanatory diagram showing an example of equipment for carrying out the operating method of the present invention. 1... Steel bar, 6... Quenching furnace, 8...
Tempering furnace, 10... Taking machine, 15... Burner, 16... Gas branch pipe, 17... Air branch pipe, 20... Gas main pipe, 21... Air wood pipe, 22. ... Gas control valve, 23 ... Air control valve, 27 ... Tension measuring device, 28 ... Pick-up caterpillar 6
Claims (1)
棒製造ラインの操業方法において、焼入、焼戻工程にガ
ス焚き炉を設け、ラインの非常時或は断線時に、ライン
停止と共に前記テンションの解除を行ない、更に燃焼ガ
スを遮断すると共に炉内に空気を送風することを特徴と
するＰＣ鋼棒製造ラインの操業方法。In the operating method of a PC steel bar production line in which steel bars are heat treated without applying a predetermined tension, a gas firing furnace is installed in the quenching and tempering processes, and in the event of a line emergency or wire breakage, the line is stopped and the tension is reduced. A method for operating a PC steel bar production line, which includes releasing the air, cutting off combustion gas, and blowing air into the furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5963483A JPS59185734A (en) | 1983-04-05 | 1983-04-05 | Operating method of production line for pc steel bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5963483A JPS59185734A (en) | 1983-04-05 | 1983-04-05 | Operating method of production line for pc steel bar |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59185734A true JPS59185734A (en) | 1984-10-22 |
| JPS6254369B2 JPS6254369B2 (en) | 1987-11-14 |
Family
ID=13118853
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5963483A Granted JPS59185734A (en) | 1983-04-05 | 1983-04-05 | Operating method of production line for pc steel bar |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59185734A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4836866A (en) * | 1987-11-09 | 1989-06-06 | Fmc Corporation | Method of improving fatigue life of an elongated component |
| US4939042A (en) * | 1987-11-09 | 1990-07-03 | Fmc Corporation | Fatigue life of a component such as a bar |
-
1983
- 1983-04-05 JP JP5963483A patent/JPS59185734A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4836866A (en) * | 1987-11-09 | 1989-06-06 | Fmc Corporation | Method of improving fatigue life of an elongated component |
| US4939042A (en) * | 1987-11-09 | 1990-07-03 | Fmc Corporation | Fatigue life of a component such as a bar |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6254369B2 (en) | 1987-11-14 |
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