JPS6254368B2 - - Google Patents
Info
- Publication number
- JPS6254368B2 JPS6254368B2 JP5963383A JP5963383A JPS6254368B2 JP S6254368 B2 JPS6254368 B2 JP S6254368B2 JP 5963383 A JP5963383 A JP 5963383A JP 5963383 A JP5963383 A JP 5963383A JP S6254368 B2 JPS6254368 B2 JP S6254368B2
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- steel bar
- gas
- tempering
- quenching
- 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 35
- 239000010959 steel Substances 0.000 claims description 35
- 238000005496 tempering Methods 0.000 claims description 32
- 238000010791 quenching Methods 0.000 claims description 29
- 230000000171 quenching effect Effects 0.000 claims description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 239000007789 gas Substances 0.000 description 19
- 238000010438 heat treatment Methods 0.000 description 17
- 238000004519 manufacturing process Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 5
- 239000000567 combustion gas Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 4
- 239000002737 fuel gas Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005491 wire drawing 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
Description
【発明の詳細な説明】
本発明はPC鋼棒熱処理装置に係り、特にガス
焚きの熱処理炉を備えかつ燃料消費量の少ない
PC鋼棒熱処理装置に関するものである。[Detailed Description of the Invention] The present invention relates to a PC steel bar heat treatment device, and in particular, it is equipped with a gas-fired heat treatment furnace and has low fuel consumption.
This relates to PC steel bar heat treatment equipment.
PC鋼棒はプレストレストコンクリートの補強
用鉄筋として用いられる鋼棒である。 PC steel rods are steel rods used as reinforcing bars for prestressed concrete.
第１図はこのPC鋼棒の製造ラインの基本的構
成を示す図である。第１図において１０は熱処理
されている鋼棒１２の素材１４を支持し、後続の
ラインに供給するサプライスタンド、１５は素材
１４を冷間引抜きし直円度を与えると共に所定の
線径にする伸線ダイスを備えた前処理設備、１６
は鋼棒１２を所定の焼入温度（例えば850℃）に
加熱する焼入炉、１８は加熱された鋼棒１２を水
冷却し焼入する焼入炉水槽、２０は鋼棒１２を所
定の焼戻温度（例えば360℃）に加熱する焼戻
炉、２２は加熱後の鋼棒１２を冷却する焼戻炉水
槽、２４は鋼棒を所定の曲率に巻き取る後処理設
備である。 FIG. 1 is a diagram showing the basic configuration of the production line for this PC steel bar. In FIG. 1, 10 is a supply stand that supports the raw material 14 of the steel rod 12 being heat treated and supplies it to the subsequent line; 15 is a supply stand that cold-draws the raw material 14 to give it roundness and a predetermined wire diameter. Pretreatment equipment equipped with wire drawing dies, 16
18 is a quenching furnace that heats the steel bar 12 to a predetermined quenching temperature (for example, 850°C); 18 is a quenching furnace water tank that cools the heated steel bar 12 with water; and 20 is a quenching furnace that heats the steel bar 12 to a predetermined quenching temperature. A tempering furnace heats the steel rod to a tempering temperature (for example, 360° C.), a tempering furnace water tank 22 cools the heated steel rod 12, and a post-treatment facility 24 winds the steel rod to a predetermined curvature.
しかして焼入炉１６及び焼戻炉２０としては、
従来、高周波加熱炉が採用されている。しかるに
電気エネルギコストの上昇に伴い、この従来の処
理ラインでは製造原価が高騰しつつあり、製造原
価低減を実現しうる製造ラインが期待されてい
る。 Therefore, as the quenching furnace 16 and the tempering furnace 20,
Conventionally, a high frequency heating furnace has been employed. However, with the rise in electrical energy costs, the manufacturing costs of this conventional processing line are rising, and there are expectations for a manufacturing line that can reduce manufacturing costs.
本発明は上記実状に鑑みてなされたもので、そ
の目的とするところは、製造原価の大幅な低減を
実現することができるPC鋼棒熱処理炉を提供す
ることにある。 The present invention has been made in view of the above-mentioned circumstances, and its purpose is to provide a PC steel bar heat treatment furnace that can achieve a significant reduction in manufacturing costs.
しかして本発明はこの目的を達成するために、
焼入炉及び焼戻炉をガス焚きとすると共に、この
焼入炉の排ガスを焼戻炉の熱源の一部を再利用す
るようにしたものである。 However, in order to achieve this objective, the present invention
The quenching furnace and the tempering furnace are gas-fired, and the exhaust gas from the quenching furnace is partially reused as a heat source for the tempering furnace.
以下図面に示す実施例を参照して本発明を詳細
に説明する。 The present invention will be described in detail below with reference to embodiments shown in the drawings.
第２図は本発明の実施例に係るPC鋼棒熱処理
装置の系統図である。この実施例ラインは第１図
のものと基本的な構成自体は同様であるが、焼入
炉１６及び焼戻炉２０の代わりに、ガス焚き式の
焼入炉２６とガス焚き式の焼戻炉２８が採用され
ている。 FIG. 2 is a system diagram of a PC steel bar heat treatment apparatus according to an embodiment of the present invention. This embodiment line has the same basic configuration as the one in FIG. 1, but instead of the quenching furnace 16 and the tempering furnace 20, a gas-fired quenching furnace 26 and a gas-fired tempering A furnace 28 is employed.
焼入炉２６には複数本のバーナ３０が配備され
ており、焼入炉空気供給ライン３２並びに焼入炉
ガス供給ライン３３から空気及び燃料ガスが供給
される。焼入炉２６中で被熱処理PC鋼棒１２を
加熱した後の燃焼排ガスは排気ダクト３４から排
出され、かつ焼戻炉２８に導入される。排気ダク
ト３４の途中には排気送風機３６が設置されると
共に、排気送風機３６と焼入炉２６との中間のダ
クトにおいて熱交換器３８が設置され、焼入炉２
６の排ガスによつて焼入炉に供給される空気を加
熱するようになつている。 A plurality of burners 30 are arranged in the quenching furnace 26, and air and fuel gas are supplied from a quenching furnace air supply line 32 and a quenching furnace gas supply line 33. The combustion exhaust gas after heating the heat-treated PC steel rod 12 in the quenching furnace 26 is discharged from the exhaust duct 34 and introduced into the tempering furnace 28 . An exhaust blower 36 is installed in the middle of the exhaust duct 34, and a heat exchanger 38 is installed in the duct between the exhaust blower 36 and the quenching furnace 26.
The exhaust gas from No. 6 heats the air supplied to the quenching furnace.
一方ガス焚き式の焼戻炉２８にも複数本のバー
ナ４０が配備されており、このバーナ４０には焼
戻炉空気供給ライン４２から空気が供給されると
共に、焼戻炉ガス供給ライン４３から燃料ガスが
供給される。バーナ４０で燃焼されて生じた燃焼
ガスは被熱処理PC鋼棒１２を焼戻温度にまで加
熱した後、焼戻炉排気ダクト４４から排出され
る。一方前記焼入炉の排気ダクト３４はこの焼戻
炉２８の炉内温度と、排気ダクト３４中の排気ガ
ス温度とが一致する部位において焼戻炉２８に導
入される。バーナ４０の燃焼ガスと排気ダクト３
４から供給されたガスとは混合され、共にPC鋼
棒１２を加熱する。そしてこれらのガスは共に排
気ダクト４４から排気筒４６に導かれ外部に放出
される。排気ダクト４４の途中には排気送風機４
８が設置されると共に、この排気送風機４８と焼
戻炉２８の途中には熱交換器５０が設置されバー
ナ４０に供給される空気を予熱するようになつて
いる。 On the other hand, the gas-fired tempering furnace 28 is also equipped with a plurality of burners 40, and air is supplied to the burners 40 from a tempering furnace air supply line 42 and from a tempering furnace gas supply line 43. Fuel gas is supplied. The combustion gas generated by combustion in the burner 40 heats the heat-treated PC steel bar 12 to a tempering temperature, and then is discharged from the tempering furnace exhaust duct 44. On the other hand, the exhaust duct 34 of the quenching furnace is introduced into the tempering furnace 28 at a location where the temperature inside the tempering furnace 28 and the exhaust gas temperature in the exhaust duct 34 match. Burner 40 combustion gas and exhaust duct 3
It is mixed with the gas supplied from 4 and heats the PC steel rod 12 together. Both of these gases are guided from the exhaust duct 44 to the exhaust pipe 46 and discharged to the outside. An exhaust blower 4 is installed in the middle of the exhaust duct 44.
A heat exchanger 50 is installed between the exhaust blower 48 and the tempering furnace 28 to preheat the air supplied to the burner 40.
このように構成された実施例の熱処理炉には、
焼入炉２６及び焼戻炉２８が共にガス焚き式であ
るので、熱源として高価な電気エネルギを必要と
しない。更に焼入炉２６から排出される高温の燃
焼ガスを焼戻炉２８の熱源として再利用している
ので、熱の利用度が高い。特に本実施例では熱交
換器３８，５０を設置し熱の回収を図り一層の省
エネルギ効果を実現している。 The heat treatment furnace of the example configured in this way has the following features:
Since both the quenching furnace 26 and the tempering furnace 28 are gas-fired, expensive electrical energy is not required as a heat source. Furthermore, since the high temperature combustion gas discharged from the quenching furnace 26 is reused as a heat source for the tempering furnace 28, the degree of heat utilization is high. In particular, in this embodiment, heat exchangers 38 and 50 are installed to recover heat and realize further energy saving effects.
第３図は本発明の異なる実施例に係るPC鋼棒
熱処理装置の系統図である。この第３図の実施例
は第２図の実施例に更に改良を加えたものであつ
て、焼戻炉排気ダクト４４を排気ダクト５２を介
してサプライスタンド１０のカバー１０ａ内に導
入し、このスタンド１０に支持されている素材１
４の予熱源として利用するようにしたものであ
る。このように焼戻炉の排ガスが保有する熱エネ
ルギを非熱処理鋼棒の予熱に使用することによ
り、引抜き加工に必要な動力費が低減されると共
にダイスの寿命を延長することができる。更にこ
のように素材を予熱することにより焼入炉に導入
される鋼棒の温度が上昇し、従つてラインスピー
ドを早くすることも可能であり生産性も向上され
る。なお第３図の実施例では焼戻炉２８の排ガス
はサプライスタンド１０のカバー１０ａに導入さ
れているが、これはサプライスタンド以外にも例
えば熱処理炉前段の鋼棒供給部各所に供給し鋼棒
を予熱するようにしてもよい。 FIG. 3 is a system diagram of a PC steel bar heat treatment apparatus according to a different embodiment of the present invention. The embodiment shown in FIG. 3 is a further improvement of the embodiment shown in FIG. Material 1 supported by stand 10
It was designed to be used as a preheating source for step 4. By using the thermal energy possessed by the exhaust gas of the tempering furnace to preheat the non-heat treated steel rod in this way, the power cost required for drawing can be reduced and the life of the die can be extended. Furthermore, by preheating the material in this way, the temperature of the steel rod introduced into the quenching furnace increases, and therefore it is possible to increase the line speed and improve productivity. In the embodiment shown in FIG. 3, the exhaust gas from the tempering furnace 28 is introduced into the cover 10a of the supply stand 10, but this gas is supplied not only to the supply stand but also to various parts of the steel rod supply section in the front stage of the heat treatment furnace. You may also preheat it.
実施例 Ａ
棒径9.15mmの鋼棒を、ラインスピード45ｍ／
分、焼入、焼戻の加熱温度各850℃、360℃とし、
加熱後水冷する熱処理を、第２図のラインを用い
て行つた。焼入炉２６の排ガス温度は熱交換器３
８での熱交換後550〜700℃である。この排ガス温
度と焼戻炉２８の炉温とが一致する地点から、該
焼入炉排ガスを焼戻炉に投入した。焼戻炉２８の
燃焼ガスと、この投入されたガスとは、混合さ
れ、排気ダクト４４に入り熱交換器５０で燃焼用
空気と熱交換し約300〜400℃となり、排気筒４６
から大気中に排出された。この結果、更にガス焚
き炉とした場合は400×103Kcal／ｔの熱原単位と
なることがこれを約350×103Kcal／ｔに低減する
ことが出来た。Example A A steel bar with a bar diameter of 9.15 mm was moved at a line speed of 45 m/
The heating temperature for quenching and tempering is 850℃ and 360℃, respectively.
A heat treatment of heating followed by water cooling was carried out using the line shown in FIG. The exhaust gas temperature of the quenching furnace 26 is determined by the heat exchanger 3.
After heat exchange at step 8, the temperature is 550-700°C. The quenching furnace exhaust gas was introduced into the tempering furnace from a point where the exhaust gas temperature and the furnace temperature of the tempering furnace 28 matched. The combustion gas in the tempering furnace 28 and this input gas are mixed, enter the exhaust duct 44, exchange heat with combustion air in the heat exchanger 50, and reach a temperature of approximately 300 to 400°C.
was emitted into the atmosphere. As a result, when using a gas-fired furnace, the heat consumption rate was 400×10 3 Kcal/t, which was reduced to about 350×10 3 Kcal/t.
実施例 Ｂ
第３図の製造ラインを用い実施例Ａと同様の棒
径、ラインスピード、加熱温度の条件で熱処理し
た。焼入炉２６の排ガスは熱交換器３８で熱交換
した後で550〜700℃である。これを実施例Ａと同
様に焼戻炉中の炉温と排ガス温度が一致する地点
から焼戻炉２８中に投入した。焼戻炉２８の排ガ
スと集合されたガスは、排気ダクト４４を通して
熱交換器５０で燃焼用空気と熱交換し約300〜400
℃となつた。さらに排気ダクト４８を通して鋼棒
供給用サプライスタンド１０の予熱カバー１０ａ
内に送られ150℃に降温し、次いで大気中に排気
された。この結果、実施例Ａに対し、更に熱原単
位を340×103Kcal／ｔにまで低減させることが出
来た。Example B Heat treatment was carried out using the production line shown in FIG. 3 under the same rod diameter, line speed, and heating temperature conditions as in Example A. The exhaust gas from the quenching furnace 26 has a temperature of 550 to 700°C after being heat exchanged in the heat exchanger 38. As in Example A, this was placed into the tempering furnace 28 from a point where the furnace temperature in the tempering furnace and the exhaust gas temperature matched. The exhaust gas from the tempering furnace 28 and the collected gas pass through the exhaust duct 44 and exchange heat with the combustion air in the heat exchanger 50, and the temperature is about 300 to 400%.
It became ℃. Furthermore, the preheating cover 10a of the supply stand 10 for supplying steel rods is passed through the exhaust duct 48.
The temperature was lowered to 150°C, and then it was exhausted to the atmosphere. As a result, compared to Example A, the heat consumption was further reduced to 340×10 3 Kcal/t.
本発明によれば、PC鋼棒の製造原価は、従来
の高周波加熱炉の約1/4〜1/5に低減することが出
来た。また、鋼棒素材が予熱されるため引抜き加
工に必要な動力費が低減されると共にダイス寿命
が長くなつた。さらに素材の予熱で焼入炉入側の
鋼棒温度が上昇することからラインスピードを約
３％上げることが可能となり生産性も向上した。 According to the present invention, the manufacturing cost of a PC steel bar could be reduced to about 1/4 to 1/5 of that of a conventional high-frequency heating furnace. Additionally, since the steel bar material is preheated, the power cost required for drawing is reduced and the life of the die is extended. Furthermore, preheating the material raises the temperature of the steel bar at the end of the quenching furnace, making it possible to increase line speed by approximately 3% and improving productivity.
以上説明した通り、本発明によればPC鋼棒の
製造コストが格段に減少される。 As explained above, according to the present invention, the manufacturing cost of PC steel bars is significantly reduced.
第１図はPC鋼棒製造ラインの基本的な系統
図、第２図及び第３図はそれぞれ本発明の実施例
に係る熱処理炉の系統図である。
１５……前処理設備、１６，２６……焼入炉、
２０，２８……焼戻炉、２４……後処理設備、３
８，５０……熱交換器。
FIG. 1 is a basic system diagram of a PC steel bar production line, and FIGS. 2 and 3 are system diagrams of a heat treatment furnace according to an embodiment of the present invention, respectively. 15... Pretreatment equipment, 16, 26... Quenching furnace,
20, 28... Tempering furnace, 24... Post-processing equipment, 3
8,50...Heat exchanger.
Claims (1)
たPC鋼棒焼入炉、PC鋼棒焼入炉水槽、ガスバー
ナを備えたPC鋼棒焼戻炉及びPC鋼棒焼戻炉水槽
が順次に配置され、かつ前記PC鋼棒焼入炉排ガ
スのPC鋼棒焼戻炉への導入用のダクトが配設さ
れてなるPC鋼棒熱処理装置。1 A PC steel bar quenching furnace equipped with a gas burner, a PC steel bar quenching furnace water tank, a PC steel bar tempering furnace equipped with a gas burner, and a PC steel bar tempering furnace water tank are arranged in sequence in the direction in which the PC steel bar material passes. and a duct for introducing the PC steel bar quenching furnace exhaust gas into the PC steel bar tempering furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5963383A JPS59185733A (en) | 1983-04-05 | 1983-04-05 | Heat treating device for pc steel bar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5963383A JPS59185733A (en) | 1983-04-05 | 1983-04-05 | Heat treating device for pc steel bar |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59185733A JPS59185733A (en) | 1984-10-22 |
| JPS6254368B2 true JPS6254368B2 (en) | 1987-11-14 |
Family
ID=13118825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5963383A Granted JPS59185733A (en) | 1983-04-05 | 1983-04-05 | Heat treating device for pc steel bar |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59185733A (en) |
-
1983
- 1983-04-05 JP JP5963383A patent/JPS59185733A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59185733A (en) | 1984-10-22 |
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