JPS6254369B2 - - Google Patents
Info
- Publication number
- JPS6254369B2 JPS6254369B2 JP5963483A JP5963483A JPS6254369B2 JP S6254369 B2 JPS6254369 B2 JP S6254369B2 JP 5963483 A JP5963483 A JP 5963483A JP 5963483 A JP5963483 A JP 5963483A JP S6254369 B2 JPS6254369 B2 JP S6254369B2
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- line
- steel
- steel rod
- tension
- 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
- 229910000831 Steel Inorganic materials 0.000 claims description 54
- 239000010959 steel Substances 0.000 claims description 54
- 238000010791 quenching Methods 0.000 claims description 10
- 230000000171 quenching effect Effects 0.000 claims description 10
- 238000005496 tempering Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims 1
- 239000000567 combustion gas Substances 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 description 7
- 238000005491 wire drawing Methods 0.000 description 5
- 238000011017 operating method Methods 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 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
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)
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り、特にライン異常発生
時の制御を行なうPC鋼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 production equipment for prestressed steel bars (steel bars used in prestressed concrete), and particularly for a prestressed steel bar production line that performs control when line abnormalities occur. related to operating methods.
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ヨンをかけ
ながら熱処理を行なつているが、この熱処理炉と
してガス焚き炉を使用している場合は、炉長が長
く、昇温及び降温に時間がかかるという特色があ
る。 Generally, on a PC steel bar manufacturing line, heat treatment is performed while applying tension to the steel bar in order to give it straightness, but if a gas-fired furnace is used as the heat treatment furnace, the furnace length is It has the characteristic that it takes a long time to heat up and cool down.
従つて、鋼棒の破断や設備の故障などが発生し
非常停止によつてラインを停止した場合、ガス焚
き炉中にある鋼棒を停止後10秒間前後で1000℃程
度にまで昇温し、クリープにより棒径が細まつ
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℃ within 10 seconds after the furnace is stopped. Creep causes the rod diameter to become narrower, eventually leading to breakage.
また、熱処理炉の前後装置における事故発生に
よつ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りを続行すると、熱
処理炉中鋼棒を含む破断箇所以降の鋼棒が全て巻
取られてしまい、ライン再開のために再度の送り
込み、乃至は巻戻しを行なつて通線する必要があ
り、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 front and rear equipment of the heat treatment furnace, if the steel rod is continued to be wound, the parts after the breakage, including the steel rod inside the heat treatment furnace, will be damaged. The steel rod is completely wound up, and in order to restart the line, it is necessary to feed it again or unwind it before passing it through the wire, which poses a problem of 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、同じく非
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 a huge 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. A PC that can reduce rewinding work and reduce line downtime.
The purpose is to provide a method for operating a steel bar production line.
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、鋼棒へのテンシヨン解
除、熱焼ガス供給停止、及び炉内への送風によつ
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 hot burning gas, and blow air into the furnace to remove the steel rod from the line and inside the furnace. The problem lies in the operating method of the PC steel bar production line, which allows the wires to remain connected.
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、まず鋼棒１
を供給するサプライスタンド２があり、次に鋼棒
１のスケール除去のためのデスケーラー３、素線
径を所定寸法にするための伸線機４、スパイラル
溝をつけるための異形加工付伸線機５、ピンチロ
ール１１、鋼棒１を850℃程度まで加熱するため
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 the production line for PC steel bars.
To explain from the upstream side of this line, first, steel rod 1
There is a supply stand 2 for supplying steel rods, followed by a descaler 3 for removing scale from the steel rod 1, a wire drawing machine 4 for reducing the wire diameter to a predetermined size, and a wire drawing machine with irregular processing for forming spiral grooves. 5. There are a pinch roll 11, a quenching furnace 6 for heating the steel bar 1 to about 850°C, a quenching water tank 7, a tempering furnace 8 for reheating it to about 360°C, and a tempering water tank 9. .
次に、鋼棒１のテンシヨ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１にテンシヨンを加えるための引取機１
０があり、鋼棒１を切断するための切断機１２を
経て、最後尾に製品となつた鋼棒１を巻取るため
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によつて切断さ
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がスリツプしない張力
を与え、炉内鋼棒１に対しては張力を弱くし、鋼
棒１の炉内断線を防止するためのものである。 Next, a tension measuring device 27 (for example, a three-point roll type load cell) for measuring the tension of the steel bar 1 is used after the wire drawing machine 5 with irregular shape processing to apply tension to the steel bar 1 in the quenching and tempering process. collection machine 1
0, and after passing through a cutting machine 12 for cutting the steel bar 1, there are winding machines 13 and 14 at the end for winding up the steel bar 1 that has become a product. These winders 13,
14 alternately winds up the steel rods 1 cut by the cutter 12 upon completion of winding. In addition, the pinch rolls 11 are used to apply tension to prevent the wire drawing machine 5 from slipping when starting up, and to weaken 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ための設備の一例を
示すもので、前記焼入炉６及び焼戻炉８には、各
各複数本のバーナー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, and each of the quenching furnace 6 and the tempering furnace 8 is provided with a plurality of burners 15. A gas branch pipe 16 and an air branch pipe 17 are connected to these burners 15, 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２０及びエア
ー本管２１に接続され、各ガス本管２０及びエア
ー本管２１には、夫々ガスコントロールバルブ２
２及びエアーコントロールバルブ２３が配置さ
れ、炉６，８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つてい
る。 Each of these gas branch pipes 16 and air branch pipes 17 is
Each zone of the furnaces 6 and 8 (only a single zone is shown in FIG. 2) is connected to the gas main pipe 20 and the air main pipe 21. , each gas control valve 2
2 and an air control valve 23 are arranged so as to be able to adjust so that a set temperature and a set air-fuel ratio in the furnaces 6 and 8 are obtained.
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によりライン速度に同調してチエーン駆
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１０には、可変速モ
ーター３０および２６が設けられ、鋼棒１の送り
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にかかるテンシヨンを設定
値になるように調整するには、張力測定器２７で
テンシヨンを測定し、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かすなわ
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つている。また、鋼棒
１にモーター２６の駆動力を伝達するために、引
取キヤタピラー２８を油圧シリンダー２９により
鋼棒１に押付けられるようになつている。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 drawing machine 10 are provided with variable speed motors 30 and 26, which adjust the feeding speed and drawing speed of the steel rod 1, that is, the line speed. To adjust the tension applied to the steel rod 1 to the set value, measure the tension with the tension measuring device 27 and determine how much faster the rotation speed of the motor 26 should be than the rotation speed of the motor 30, that is, higher than the feed speed. This is done by adjusting how fast the take-up speed is. Further, in order to transmit the driving force of the motor 26 to the steel rod 1, the take-up caterpillar 28 is pressed against the steel rod 1 by a hydraulic cylinder 29. Note that the winders 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
焼量をガスコントロールバルブ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つて、
焼入炉６及び焼戻炉８の炉温を設定温度になるよ
うにしている。また、鋼棒１に与えるテンシヨン
量の調整は、張力測定器２７でテンシヨンを測定
し引取機１０のモーター２６の回転数を変えるこ
とにより行なつている。尚、各モーター２５，２
６，３０の回転数は、設定値通りになるよう、全
て同期されている。 Now, during normal operation, the amount of combustion in the burner 15 is controlled by adjusting the opening instructions of the gas control valve 22 and the air control valve 23.
The furnace temperatures of the quenching furnace 6 and the tempering furnace 8 are set to a 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 rotational speed of the motor 26 of the pulling machine 10. In addition, each motor 25, 2
The rotation speeds of 6 and 30 are all synchronized so that they match the set values.
ここで、鋼棒１の切断や設備の故障などの原因
によりライン停止をかける場合、非常停止ボタン
（図示せず）を押して各モーター２５，２６，３
０を停止させ、鋼棒１の送り出し、引取り、及び
巻取りを停止する。 If the line is to be stopped due to a breakage of the steel rod 1 or equipment failure, press the emergency stop button (not shown) and press the emergency stop button (not shown) to stop each motor 25, 26, 3.
0, and the feeding, take-up, and winding of the steel rod 1 are stopped.
焼入炉６及び焼戻炉８では、ガスコントロール
バルブ２２が全閉になつて燃焼を停止する。逆
に、エアーコントロールバルブ２３は全開とな
り、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 valves 22 are fully closed to stop combustion. Conversely, the air control valve 23 is fully opened, and cold air is blown into the furnaces 6 and 8 from the openings of the burners 15 to prevent the temperature of the steel rod 1 from rising and to cool it.
更に、引取機１０の引取キヤタピラー２８の押
付けが解除されて、鋼棒１へのテンシヨンが解除
される。 Further, the pressure on the take-off caterpillar 28 of the take-off machine 10 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１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。従つて、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
業が不要となり、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 operations are automatically performed 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, the work of cutting out the deteriorated portion of the steel bar 1, the work of joining the cut parts, and the work of rerouting the wires to the furnaces 6 and 8 are no longer necessary, and the line can be restarted easily.
尚、焼入炉６及び焼戻炉８の前後装置のトラブ
ルによつて鋼棒１が切断するような場合にも、ラ
イン主要部に設けた、リミツトスイツチ、或は光
学センサーなど各種センサー（図示せず）によつ
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、及びテンシヨン
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
再稼動のた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 with the equipment before and after the quenching furnace 6 and tempering furnace 8, various sensors such as limit switches or optical sensors (not shown in the figure) installed in the main part of the line can be used. If the cutting of the steel rod 1 is detected using It is possible to prevent deterioration of the steel bars No. 6 and 8 and shorten the joining time for 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PC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、１
０……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……エアー本管、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、２
７……張力測定器、２８……引取キヤタピラー。
FIG. 1 is an explanatory diagram of a PC 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, 1
0... Taking machine, 15... Burner, 16... Gas branch pipe, 17... Air branch pipe, 20... Gas main pipe,
21...Air main pipe, 22...Gas control valve, 23...Air control valve, 2
7...Tension measuring device, 28...Take-back caterpillar.
Claims (1)
するPC鋼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ヨ
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。1. In a method of operating a PC steel bar manufacturing line that heat-treats steel bars while applying a predetermined tension, a gas-fired 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 removed. A method for operating a PC steel bar manufacturing line, which is characterized by releasing 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 JPS59185734A (en) | 1984-10-22 |
| JPS6254369B2 true 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) |
Families Citing this family (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
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59185734A (en) | 1984-10-22 |
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