JPS61136618A - Induction heating method - Google Patents
Induction heating methodInfo
- Publication number
- JPS61136618A JPS61136618A JP59258490A JP25849084A JPS61136618A JP S61136618 A JPS61136618 A JP S61136618A JP 59258490 A JP59258490 A JP 59258490A JP 25849084 A JP25849084 A JP 25849084A JP S61136618 A JPS61136618 A JP S61136618A
- Authority
- JP
- Japan
- Prior art keywords
- heated
- coil
- heating
- steel pipe
- pipe
- 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.)
- Pending
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Heat Treatment Of Articles (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、鋼管等の誘導加熱方法に関する〇〔従来の技
術〕
この種の誘導加熱方法は、温度制御が容易であるなどの
利点から汎く用いら几ており、鋼管の熱処理やプラスチ
ック被覆鋼管の被覆処理にも用いら°ｎている。その加
熱原理は、コイルに商用または高周波数の電流を流すこ
とに、よって、磁界を生成させ、被加熱材料に誘導電流
を生起させることによりジュール熱を発生させるもので
ある。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an induction heating method for steel pipes, etc. [Prior Art] This type of induction heating method has been widely used due to its advantages such as easy temperature control. It is widely used and is also used for heat treatment of steel pipes and coating treatment of plastic-coated steel pipes. The heating principle is to pass a commercial or high-frequency current through the coil, thereby generating a magnetic field and generating an induced current in the material to be heated, thereby generating Joule heat.
しかし、第４図のように、加熱コイル１の内径に対して
、被加熱材料たとえば鋼管２の外径が小さく、そｎらの
ギャップが大きいと、加熱が十分でなくかつ温度制御も
十分に行い得ない。一般に、その限界ギャップは約１０
０１１程度であるｏｔｆｃ、割合的に示すと、被加熱体
外径／加熱コイル内径が０．７５以下であると、加熱速
度が非常に遅く、能率が低い。そして、加熱コイルによ
る焼入ｎの場合にあっては、焼入ｎ直前にＡ３点以下に
鋼管の温度が低下し、焼入ｎ不能なこともある。However, as shown in Fig. 4, if the outer diameter of the material to be heated, such as the steel pipe 2, is small compared to the inner diameter of the heating coil 1, and the gap between them is large, heating will not be sufficient and temperature control will not be sufficient. I can't do it. Generally, the critical gap is about 10
If the otfc is about 0.011, and the ratio of the outer diameter of the heated body/the inner diameter of the heating coil is 0.75 or less, the heating rate is very slow and the efficiency is low. In the case of quenching using a heating coil, the temperature of the steel pipe drops below the A3 point immediately before quenching, and quenching may not be possible.
勿論、当該材料の径に対応した加熱コイルを用意すｎば
問題はないが、種々のサイズの鋼管に対応して多数の加
熱コイルを用意することは、加熱コイルがきわめて高価
であるため現実的ではないし、段取にも手間を要す。Of course, there is no problem if you prepare a heating coil that corresponds to the diameter of the material in question, but it is not practical to prepare a large number of heating coils for steel pipes of various sizes because heating coils are extremely expensive. It's not that easy, and it takes a lot of time to set it up.
そこで、本発明の目的は、簡易かつ経済的に当該コイル
を変更することなく小サイズのものであっても十分な加
熱効率をもって加熱することができる誘導加熱方法を提
供することにある。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an induction heating method that can easily and economically heat even a small-sized coil with sufficient heating efficiency without changing the coil.
上記問題点を解決するための本発明は、環状の誘導加熱
コイル内を被加熱材料を相対的に通過せしめこｎｆ誘導
加熱する方法において、前記誘導加熱コイルと被加熱材
料の間に実質的に環状の誘導電流によりジュール熱を発
生する介装材料を介在させ、この介装材料を二次加熱源
として被加熱材料を加熱することを特徴とするものであ
る。To solve the above problems, the present invention provides a method for induction heating in which a material to be heated is relatively passed through an annular induction heating coil, in which there is substantially no space between the induction heating coil and the material to be heated. The method is characterized in that an intervening material that generates Joule heat by a circular induced current is interposed, and the material to be heated is heated using this intervening material as a secondary heating source.
本発明では、第１図に示すように、加熱コイルｌに対し
て、あまシも被加熱材料たる鋼管２が小径である場合だ
おいて、そｎらの間に鋼管等の環状の介装材料３を介在
させる。介装材料は、加熱コイル１により誘導電流を生
じジュール熱を発生する材料からなる。その結果、介装
材料３は、こｎが被加熱材料となって加熱さｎｌその放
射熱が鋼管２へ与えらｎる０すなわち、介装材料３か二
次加熱源となる。勿論、鋼管２に対しても、磁界が作用
するから、直接的にも誘導加熱される。しかし、主体は
介装材料３による放射熱である。かくして、鋼管の径に
応じて加熱コイル１を変更することなく、大径鋼管用加
熱コイル１によって、小径鋼管２の加熱も行うことがで
きる。In the present invention, as shown in FIG. 1, even if the steel pipe 2, which is the material to be heated, has a small diameter, an annular interposition such as a steel pipe is inserted between the heating coil l and the heating coil l. Material 3 is interposed. The intervening material is made of a material that generates an induced current by the heating coil 1 and generates Joule heat. As a result, the interposition material 3 becomes a heated material and its radiant heat is applied to the steel pipe 2. In other words, the interposition material 3 becomes a secondary heating source. Of course, since the magnetic field acts on the steel pipe 2, it is also directly induction heated. However, the main component is radiant heat from the intervening material 3. Thus, the small diameter steel pipe 2 can also be heated by the large diameter steel pipe heating coil 1 without changing the heating coil 1 according to the diameter of the steel pipe.
以下本発明をさらに詳説する。 The present invention will be explained in more detail below.
本発明は、前述のように、加熱コイル１と被加熱材料２
とのギャップＧが１００ｍｍ以上、また被加熱体外径φ
ｐｏ／加熱コイル内径φＣＩが０．７５以下の場合に用
いるのが特に好適である。As mentioned above, the present invention has a heating coil 1 and a material to be heated 2.
The gap G is 100 mm or more, and the outer diameter of the heated object
It is particularly suitable to use when po/heating coil inner diameter φCI is 0.75 or less.
介装材料３としては、友とえば短尺鋼管を用いることが
できる。この介装材料はジュール熱を効率的に発生する
ものであｎば足り、鉄、鋼あるいはタングステン等が用
いられる。また、この介装材料は、実質的に環状であれ
ばよく、たとえば複数個の扇板（円弧状板）セグメント
’を環状に組み立ててもよい。ただ、セグメント間の間
隙に対応する部分は加熱ムラが生じる可能性があるが、
たとえば被加熱材料がスパイラル送りさｎる場合などに
おいては何ら支障はない。また、介装材料３はライン方
向に複数個設けてもよい。As the intervening material 3, a short steel pipe, for example, can be used. This intervening material only needs to be one that efficiently generates Joule heat, and iron, steel, tungsten, or the like is used. Further, this intervening material only needs to be substantially annular, and for example, a plurality of fan plate (arc-shaped plate) segments' may be assembled into an annular shape. However, there is a possibility that uneven heating may occur in the area corresponding to the gap between the segments.
For example, there is no problem when the material to be heated is fed in a spiral manner. Further, a plurality of intervening materials 3 may be provided in the line direction.
加熱コイル１と被加熱材料２とは相対的に後者が前者を
通過するものでｈｎばよく、加熱コイルｌが移動するも
のであってもよい。The heating coil 1 and the material to be heated 2 may be such that the latter passes through the former relatively, or the heating coil 1 may be movable.
加熱コイル１と被加熱材料２との間の介装材料３の介在
態様は重要な要素でちる。すなわち、コイル−介装材料
間ギャップＧｏ、介装材料〜被加熱材料間ギャップＧＩ
が大きいと、加熱効率が低い０
すなわち、誘導加熱コイルに対する熱の前書を考えると
・Ｇｏ≧Ｇｒとするのが好ましく、さらにＧ。間に熱イ
ンシュレータを介在させるのが望ましい。さらにＧ。は
２０≦Ｇｏ＜１００ｍｍ、特に５０≦Ｇｏ≦８０．、が
好適である。しかもＧｒについては、２０龍以上、特に
５０１１１以上とするのが、被加熱材料との相対的移動
に伴う接触事故防止上好ましい。そして、こｎらの条件
を満す範囲内で、介装材料の肉厚ｔが厚いのが好ましい
。The manner in which the intervening material 3 is interposed between the heating coil 1 and the material to be heated 2 is an important factor. That is, the gap Go between the coil and the intervening material, and the gap GI between the intervening material and the heated material.
If G is large, the heating efficiency is low.0 That is, considering the heat for the induction heating coil, it is preferable to set Go≧Gr, and furthermore, G. It is desirable to interpose a thermal insulator in between. More G. is 20≦Go<100mm, especially 50≦Go≦80. , is suitable. Moreover, it is preferable to set Gr to 20 or more, particularly 50111 or more, in order to prevent accidents caused by contact with the material to be heated due to relative movement. It is preferable that the thickness t of the intervening material is large within a range that satisfies these conditions.
一方、介装材料は対象の被加熱材料径に応じて複数用意
しておき、かつこれらを取替え配置するようにしておく
のが操業上便利である。こｎに適う装置が第２図および
第３図に示されている。On the other hand, it is convenient for operation to prepare a plurality of intervening materials according to the diameter of the target material to be heated and to replace and arrange these materials. Apparatus suitable for this purpose is shown in FIGS. 2 and 3.
すなわち、被加熱材料としての鋼管２搬送ラインを横切
って塔載台車１０が設けらｎｌこの台車１０はラインと
直交するレール１１．１１に沿って自走用モータ１２に
よって横断自在となっている０台車１０には保持ブロッ
ク１３が配され、この保持ブロック１３は、その下部に
おいて台車１０のライン方向に沿う案内ｍ １０ ａに
嵌合しており、台車１０上をライン方向に移動自在とな
っている。That is, a tower carriage 10 is installed across the conveyance line for the steel pipes 2 as the material to be heated. A holding block 13 is disposed on the cart 10, and this holding block 13 is fitted in a guide m10a along the line direction of the cart 10 at its lower part, and is movable on the cart 10 in the line direction. There is.
この移動は、保持ブロック１３を螺合状態で貫く移動用
ネジ杆１４を軸受１５，１５によって軸支するとともに
、ネジ杆１４を移動用モータ１６によって正逆回転する
ことによって行わルる。This movement is carried out by supporting a moving threaded rod 14 screwed through the holding block 13 by bearings 15, 15, and rotating the threaded rod 14 forward and backward by a moving motor 16.
また保持ブロック１３の前面（加熱コイル側面）には、
ターレット盤１７が回転中心１８の周９を回転駆動装置
（図示せず）によって図示例では９０度ごと回転自在と
なっており、このターレット盤１７の径の異なるたとえ
ば４種の介装材料３Ａ〜３Ｄが装着されている。各介装
材料３Ａ〜３Ｄの中心は、回転中心１８を中心とする円
上にあシ、その円上の１点がライン中心ＣＬおよび加熱
コイル中心に一致している。In addition, on the front side of the holding block 13 (on the side of the heating coil),
In the illustrated example, the turret disk 17 is rotatable around the circumference 9 of the rotation center 18 by a rotation drive device (not shown) in 90 degree increments. 3D is installed. The center of each of the intervening materials 3A to 3D lies on a circle centered on the rotation center 18, and one point on the circle coincides with the line center CL and the heating coil center.
かかる装置においては、当初台車１０はライン外位置に
１、かつ保持ブロック１３が加熱コイル］から離間し友
後方位置にある。操業時においては、台車１０がライン
側へ進出し、ターレット盤１７を回転し必要なサイズの
介装材料を選択しく図示例では介装材料３Ａ）７を後、
移動用モータ１６が起動さｎ１保持ブロツク１３と共に
当該介装材料３Ａが加熱コイル１と鋼管２との間に挿入
さｎる。ここで鋼管２は、保持ブロック１３の貫通孔１
３ａおよびターレット盤１７の各介装材料３Ａ〜３Ｄの
内径と同一の貫通孔全通って連続的に介装材料内を通過
する。この過程で、介装材料の放射熱によって加熱さｎ
る。In such a device, the cart 10 is initially located at an off-line position, and the holding block 13 is located at a distance from and behind the heating coil. During operation, the trolley 10 advances to the line side, rotates the turret board 17, and selects the interposition material of the required size.In the illustrated example, after the interposition material 3A) 7,
The moving motor 16 is started, and the intervening material 3A is inserted between the heating coil 1 and the steel pipe 2 together with the holding block 13. Here, the steel pipe 2 is connected to the through hole 1 of the holding block 13.
3a and the turret plate 17, and continuously pass through the inside of the intervening material through all the through holes having the same inner diameter as the intervening materials 3A to 3D. During this process, the intervening material is heated by radiant heat.
Ru.
次に他のサイズの鋼管を熱処理する場合には、保持ブロ
ック１３の後退によって介装材料３Ａは退出さｎｌその
後台車１０がラインから外ｎ１当初の位置に戻り、前述
のような段取操作に戻る。Next, when a steel pipe of another size is to be heat treated, the holding block 13 retreats and the interposer material 3A is withdrawn.Then the trolley 10 returns to its initial position outside the line, and the setup operation as described above is carried out. return.
次に実施例を示す。 Next, examples will be shown.
内径７００ｉｍＸ長さ５００朋の加熱コイルに、周波数
５０Ｈｚの電流を流し、各種サイズの材質ＨＴ ６０の
鋼管を２０℃から９５０°Ｃに加熱する場合において、
各種サイズの磁性体を使用し、必要な加熱速度（９５０
’Ｃに達するに必要な鋼管の搬送速度）ｆｃ求めた。そ
の結果を比較例と共に第１表に示す。サイズの単位はｘ
ＩＥ。When heating steel pipes of various sizes made of HT 60 from 20°C to 950°C by passing a current at a frequency of 50Hz through a heating coil with an inner diameter of 700mm and a length of 500mm,
Using magnetic materials of various sizes, the required heating rate (950
The conveyance speed of the steel pipe necessary to reach 'C) fc was determined. The results are shown in Table 1 along with comparative examples. The unit of size is x
I.E.
第 １ 表
この結果によると、介装材料を介在させない時の充填率
低下による影響（加熱効率の低下率）は２５憾にも及ぶ
が、同一寸法の環状物を介在させた時の影響（低下率）
は１５％にすぎない。ま之介装材料がある事により５０
％〜６７チもの速度向上が期待できることが判る。Table 1 According to the results, the influence of a decrease in the filling rate (rate of decrease in heating efficiency) when no intervening material is used is as much as 25%, but the influence when an annular object of the same size is interposed (decrease). rate)
is only 15%. 50 due to Manosuke materials.
It can be seen that a speed improvement of as much as 67% can be expected.
以上の通り、本発明によれば、被加熱材料のサイズごと
高価な加熱コイルを用意する必要はなく、安価な介装材
料を用意するだけで、加熱コイルの径に対して極端に小
さいサイズの被加熱材料を十分な加熱効率をもって加熱
できる利点かもたらさｎる。As described above, according to the present invention, there is no need to prepare expensive heating coils for each size of the material to be heated, and by simply preparing an inexpensive intervening material, heating coils of extremely small size relative to the diameter of the heating coil can be heated. This brings about the advantage that the material to be heated can be heated with sufficient heating efficiency.
第１図は本発明法の態様を示したもので、（ａ）は縦断
面図・（ｂ）は横断面図、第２図は磁性体の交換・配置
装置の正面図、第３図はその左側面図、第４図は従来法
゛の態様を示したもので、（ａ）は縦断面図、（ｂ）は
横断面図である。
１・・加熱コイル ２・・鋼管（被加熱材料）３．３
Ａ〜３Ｄ・・介装材料 ｉ、ｏ・・台車１３・・保持
ブロック １７・・ターレット盤第１図
”’ （ｂ）
第４図Fig. 1 shows an embodiment of the method of the present invention, (a) is a longitudinal cross-sectional view, (b) is a cross-sectional view, Fig. 2 is a front view of the magnetic body exchange/placement device, and Fig. 3 is a The left side view and FIG. 4 show an aspect of the conventional method, where (a) is a longitudinal cross-sectional view and (b) is a cross-sectional view. 1. Heating coil 2. Steel pipe (material to be heated) 3.3
A~3D...Intervening material i, o...Carriage 13...Holding block 17...Turret board Fig. 1"' (b) Fig. 4
Claims (1)
通過せしめこれを誘導加熱する方法において、前記誘導
加熱コイルと被加熱材料の間に実質的に環状の誘導電流
によりジュール熱を発生する介装材料を介在させ、この
介装材料を二次加熱源として被加熱材料を加熱すること
を特徴とする誘導加熱方法。(1) In a method of induction heating a material to be heated by relatively passing it through a ring-shaped induction heating coil, Joule heat is generated by a substantially circular induced current between the induction heating coil and the material to be heated. An induction heating method characterized in that an intervening material is used as a secondary heating source to heat a material to be heated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59258490A JPS61136618A (en) | 1984-12-07 | 1984-12-07 | Induction heating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59258490A JPS61136618A (en) | 1984-12-07 | 1984-12-07 | Induction heating method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61136618A true JPS61136618A (en) | 1986-06-24 |
Family
ID=17320929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59258490A Pending JPS61136618A (en) | 1984-12-07 | 1984-12-07 | Induction heating method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61136618A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01139729A (en) * | 1987-11-27 | 1989-06-01 | Nippon Ajiyatsukusu Magunesaamic Kk | Heat treatment apparatus for wire rod |
| WO2010001223A1 (en) | 2008-06-30 | 2010-01-07 | Eaton Corporation | Continuous production system for magnetic processing of metals and alloys to tailor next generation materials |
| CN102080154A (en) * | 2011-02-16 | 2011-06-01 | 贵州虹山虹飞轴承有限责任公司 | Novel method for quickly eliminating residual stress of metal material |
| CN105324496A (en) * | 2013-06-22 | 2016-02-10 | 感应加热有限公司 | Inductor for single-shot induction heating of complex workpieces |
| CN106048182A (en) * | 2016-05-27 | 2016-10-26 | 燕山大学 | All-surrounding type large-scale cylinder section induction heating furnace |
-
1984
- 1984-12-07 JP JP59258490A patent/JPS61136618A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01139729A (en) * | 1987-11-27 | 1989-06-01 | Nippon Ajiyatsukusu Magunesaamic Kk | Heat treatment apparatus for wire rod |
| WO2010001223A1 (en) | 2008-06-30 | 2010-01-07 | Eaton Corporation | Continuous production system for magnetic processing of metals and alloys to tailor next generation materials |
| CN102080154A (en) * | 2011-02-16 | 2011-06-01 | 贵州虹山虹飞轴承有限责任公司 | Novel method for quickly eliminating residual stress of metal material |
| CN105324496A (en) * | 2013-06-22 | 2016-02-10 | 感应加热有限公司 | Inductor for single-shot induction heating of complex workpieces |
| CN106048182A (en) * | 2016-05-27 | 2016-10-26 | 燕山大学 | All-surrounding type large-scale cylinder section induction heating furnace |
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