JPS6254370B2 - - Google Patents
Info
- Publication number
- JPS6254370B2 JPS6254370B2 JP5963583A JP5963583A JPS6254370B2 JP S6254370 B2 JPS6254370 B2 JP S6254370B2 JP 5963583 A JP5963583 A JP 5963583A JP 5963583 A JP5963583 A JP 5963583A JP S6254370 B2 JPS6254370 B2 JP S6254370B2
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- tension
- quenching
- steel bar
- steel
- 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 39
- 239000010959 steel Substances 0.000 claims description 39
- 238000010791 quenching Methods 0.000 claims description 18
- 230000000171 quenching effect Effects 0.000 claims description 18
- 238000005496 tempering Methods 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 238000011017 operating method Methods 0.000 claims description 3
- 238000010304 firing Methods 0.000 claims 1
- 238000005491 wire drawing Methods 0.000 description 8
- 238000004804 winding Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000001788 irregular Effects 0.000 description 3
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004033 diameter control Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 230000004043 responsiveness Effects 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)
- Control Of Heat Treatment Processes (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）の製造設備の線径制御を行
なう操業方法に係り、特に焼入後の棒径を測定し
てテンシヨンコントロールを行なう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 wire diameter of manufacturing equipment for prestressed steel bars (steel bars used in prestressed concrete), and in particular, tension control by measuring the rod diameter after quenching. This article relates to a method of operating a PC steel bar 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、従来の高
周波加熱に比べて炉長が長く、鋼棒の在炉時間が
長くなる。 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 when a gas-fired furnace is used as the heat treatment furnace, it is difficult to Compared to high-frequency heating, the furnace length is longer, and the steel rod stays in the furnace longer.
従つて、クリープによる線径の細まりが問題と
なる。而して、一般にクリープ速度は鋼棒温度及
び鋼棒張力に基づく応力レベルで大幅に変化し、
またクリープ量は、このクリープ速度と、在炉時
間つまりライン速度とに大きく影響される。 Therefore, narrowing of the wire diameter due to creep becomes a problem. Therefore, in general, the creep rate varies greatly depending on the stress level based on the steel bar temperature and steel bar tension.
Further, the amount of creep is greatly influenced by the creep rate and the furnace time, that is, the line speed.
本発明の目的とする処は、線径へのこのような
影響要因を考慮して、線径を所定の許容値内に収
めることのできるPC製造ラインの操業方法を提
供することにある。 An object of the present invention is to provide a method for operating a PC production line that can keep the wire diameter within a predetermined tolerance value, taking into account such factors that influence the wire diameter.
即ち、本発明の要旨とする処は、炉温制御と共
に、焼入後の棒径から鋼棒のテンシヨンコントロ
ールを行なうPC製造ラインの操業方法にある。 That is, the gist of the present invention resides in a method of operating a PC production line in which tension control of steel bars is performed based on the bar diameter after quenching as well as furnace temperature control.
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, for applying 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 apply tension to prevent the wire drawing machine 5 from slipping at startup, and weaken the tension to the steel rod 1 in the furnace.
This is to prevent the steel rod 1 from breaking 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、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１８及びエアー本管１９に接続されている。
各ガス本管１８及びエアー本管１９には、夫々ガ
スコントロールバルブ２０及びエアーコントロー
ルバルブ２１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節することが
できるようになつている。 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. Gas branch pipes 16 and air branch pipes 17 are connected to these burners 15, and these gas branch pipes 16 and air branch pipes 17 are connected to each zone of the furnaces 6 and 8 (in FIG. 2, only a single zone is connected). ), and are connected to a gas main pipe 18 and an air main pipe 19.
A gas control valve 20 and an air control valve 21 are arranged in each gas main pipe 18 and air main pipe 19, respectively, so that they can be adjusted to obtain a set temperature and a set air-fuel ratio in the furnaces 6 and 8. It's getting old.
尚、焼入炉６及び焼戻炉８内には、ハースロー
ル２２が複数本配置されて鋼棒１を支持し、モー
タ２３によりライン速度に同調してチエーン駆動
されている。又、同炉６，８内に夫々設けられた
熱電対２４が炉温を監視し、焼入炉６及び焼戻炉
８内で鋼棒１の温度が夫々設定温度になるよう、
バーナー１５での燃焼量をガスコントロールバル
ブ２０とエアーコントロールバルブ２１とで開度
調整をしている。 A plurality of hearth rolls 22 are disposed within the quenching furnace 6 and the tempering furnace 8 to support the steel rod 1, and are chain-driven by a motor 23 in synchronization with the line speed. Further, thermocouples 24 provided in the furnaces 6 and 8 monitor the furnace temperature so that the temperature of the steel rod 1 in the quenching furnace 6 and the tempering furnace 8 reaches the set temperature, respectively.
The amount of combustion in the burner 15 is adjusted by a gas control valve 20 and an air control valve 21.
焼入炉６及び焼戻炉８の出口側には温度計２５
が夫々配置され、鋼棒温度の監視及びライン速度
の指示を行なえるようになつている。 A thermometer 25 is installed on the exit side of the quenching furnace 6 and the tempering furnace 8.
are arranged in each line so that the steel rod temperature can be monitored and the line speed can be instructed.
前記伸線機５および引取機１０では、可変速モ
ータ３０および２６により、鋼棒１の送り出し速
度および引取り速度つまりライン速度を調整して
いる。テンシヨン量の調整は、引取り速度を送り
出し速度よりいくら速くするかにより行なつてい
る。 In the wire drawing machine 5 and the drawing machine 10, variable speed motors 30 and 26 adjust the feeding speed and drawing speed of the steel rod 1, that is, the line speed. The tension amount is adjusted by determining how much faster the take-up speed is than the delivery speed.
即ち、引取キヤタピラー２７を油圧シリンダー
２８によつて鋼棒１に押し付け、鋼棒１にモータ
２６の駆動力を伝達している。また、テンシヨン
量の監視は、張力測定器２９によつて行なう。 That is, the take-up caterpillar 27 is pressed against the steel rod 1 by the hydraulic cylinder 28, and the driving force of the motor 26 is transmitted to the steel rod 1. Further, the amount of tension is monitored by a tension measuring device 29.
尚、テンシヨン量の設定については、焼入用水
槽７の出口側に設けられた線径測定器３０から指
示が出される。この線径測定器３０を焼入用水槽
７の出口側に設けたのは、焼戻炉８での棒温が
360℃程度と低く、クリーブによる棒径変化が殆
んどなく、焼入後の線径が略々製品径となるため
であり、また焼入炉６内での線径コントロールに
対する応答性が高くなるためでもある。 Note that instructions for setting the tension amount are issued from a wire diameter measuring device 30 provided on the outlet side of the quenching water tank 7. This wire diameter measuring device 30 was installed on the exit side of the quenching water tank 7 because the rod temperature in the tempering furnace 8 was
This is because the temperature is as low as 360°C, there is almost no change in rod diameter due to cleaving, the wire diameter after quenching is approximately the product diameter, and the responsiveness to wire diameter control in the quenching furnace 6 is high. It is also to become.
尚また、巻取機１３，１４の回転数は、引取機
１０のモータ２６の回転数を検知し、更に鋼棒１
の巻取径を測定し、これらの数値演算を行なつ
て、ライン速度に合うように制御される。 Furthermore, the rotational speed of the winding machines 13 and 14 is determined by detecting the rotational speed of the motor 26 of the take-up machine 10,
The winding diameter of the line is measured and numerical calculations are performed to control the winding to match the line speed.
かくして、棒温のコントロールは、各炉６，８
での燃焼制御と、ライン速度の制御とで行なう。
即ち、燃焼制御は、前述した如く熱電対２４での
監視の下でガスコントロールバルブ２０及びエア
ーコントロールバルブ２１の開度調整により行な
う。又、ライン速度制御は、温度計２５による棒
温の監視に基づき、この棒温が所定値より低い場
合は、伸線機５および引取機１０のモータ３１お
よび２６の回転数を下げてライン速度を落とす等
して行なう。尚、ハースロール２２の駆動モータ
２３および巻取機１３，１４の巻取速度はこのモ
ータ２６に同調される。 Thus, the bar temperature can be controlled at each furnace 6, 8.
This is done by controlling the combustion at the engine and controlling the line speed.
That is, combustion control is performed by adjusting the openings of the gas control valve 20 and the air control valve 21 while being monitored by the thermocouple 24 as described above. Line speed control is based on monitoring of the rod temperature using a thermometer 25, and if this rod temperature is lower than a predetermined value, the line speed is reduced by lowering the rotational speed of the motors 31 and 26 of the wire drawing machine 5 and the pulling machine 10. Do this by dropping, etc. Note that the drive motor 23 of the hearth roll 22 and the winding speed of the winders 13 and 14 are synchronized with this motor 26.
更に棒径のコントロールは、線径測定器３０で
線径を測定し、鋼棒１へのテンシヨン量を制御し
て行なう。即ち、例えば線径が設定値より小さく
なつた場合は、異形加工付伸線機５の回転数を変
えずに引取機１０のモータ２６の回転数を下げる
ことによつて、鋼棒１へのテンシヨンを下げれば
よく、逆にテンシヨンを大きくする場合には、モ
ータ２６の回転数を上げればよい。尚、このテン
シヨン量を監視している張力測定器２９での測定
値が、鋼棒１の真直性を与えるための下限値にな
つた時には、警報或は非常停止を行なう。 Further, the rod diameter is controlled by measuring the wire diameter with a wire diameter measuring device 30 and controlling the amount of tension applied to the steel rod 1. That is, for example, when the wire diameter becomes smaller than the set value, the number of rotations of the motor 26 of the drawing machine 10 is lowered without changing the number of rotations of the wire drawing machine 5 with deformation processing, thereby reducing the number of wires on the steel rod 1. It is sufficient to lower the tension, and conversely, to increase the tension, the rotation speed of the motor 26 may be increased. Incidentally, when the value measured by the tension measuring device 29 which monitors the amount of tension reaches the lower limit value for providing straightness of the steel rod 1, an alarm or an emergency stop is issued.
以上の通り、本発明によれば、クリープによる
線径のばらつきを棒温制御すると同時に、ライン
速度の差による在炉時間中のクリープ量をテンシ
ヨン制御することによつて、鋼棒の線径の制御を
容易且つ確実に行なうことができる。 As described above, according to the present invention, the wire diameter of the steel rod can be adjusted by controlling the bar temperature to reduce the variation in the wire diameter due to creep, and at the same time by tension controlling the amount of creep during the furnace time due to the difference in line speed. Control can be performed easily and reliably.
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、５……異形加工付伸線機、６……
焼入炉、８……焼戻炉、１０……引取機、２０…
…ガスコントロールバルブ、２１……エアーコン
トロールバルブ、２３，２６……モータ、２４…
…熱電対、２５……温度計、２７……引取キヤタ
ピラー、２９……張力測定器、３０……線径測定
器、３１……モータ。
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, 5... Wire drawing machine with irregular shape processing, 6...
Quenching furnace, 8... Tempering furnace, 10... Taking machine, 20...
...Gas control valve, 21...Air control valve, 23, 26...Motor, 24...
... thermocouple, 25 ... thermometer, 27 ... take-up caterpillar, 29 ... tension measuring device, 30 ... wire diameter measuring device, 31 ... motor.
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、鋼棒温度が所
定温度になるように焼入炉及び焼戻炉の炉温制御
を行なうと共に、焼入後の棒径から鋼棒のテンシ
ヨンコントロールを行なつて鋼棒の線径制御を行
なうことを特徴とするPC鋼棒製造ラインの操業
方法。1. In the operating method of a PC steel bar manufacturing line that heat-treats steel bars while applying a predetermined tension, a gas firing furnace is installed in the quenching and tempering processes, and the quenching furnace and quenching furnace are heated so that the steel bar temperature reaches the predetermined temperature. A method for operating a PC steel bar manufacturing line, characterized in that the furnace temperature of a return furnace is controlled, and the wire diameter of the steel bar is controlled by controlling the tension of the steel bar based on the diameter of the bar after quenching.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5963583A JPS59185735A (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 |
|---|---|---|---|
| JP5963583A JPS59185735A (en) | 1983-04-05 | 1983-04-05 | Operating method of production line for pc steel bar |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59185735A JPS59185735A (en) | 1984-10-22 |
| JPS6254370B2 true JPS6254370B2 (en) | 1987-11-14 |
Family
ID=13118882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5963583A Granted JPS59185735A (en) | 1983-04-05 | 1983-04-05 | Operating method of production line for pc steel bar |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59185735A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0499461U (en) * | 1991-01-22 | 1992-08-27 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102233364B (en) * | 2010-04-21 | 2013-09-04 | 宝山钢铁股份有限公司 | Martensite air valve steel bar production method |
-
1983
- 1983-04-05 JP JP5963583A patent/JPS59185735A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0499461U (en) * | 1991-01-22 | 1992-08-27 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59185735A (en) | 1984-10-22 |
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