JPS6129111B2 - - Google Patents
Info
- Publication number
- JPS6129111B2 JPS6129111B2 JP55011841A JP1184180A JPS6129111B2 JP S6129111 B2 JPS6129111 B2 JP S6129111B2 JP 55011841 A JP55011841 A JP 55011841A JP 1184180 A JP1184180 A JP 1184180A JP S6129111 B2 JPS6129111 B2 JP S6129111B2
- Authority
- JP
- Japan
- Prior art keywords
- inductor coil
- silicon steel
- laminated
- heating device
- induction heating
- 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
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- 230000006698 induction Effects 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 3
- 150000003376 silicon Chemical class 0.000 claims 1
- 230000004907 flux Effects 0.000 description 3
- 239000010445 mica Substances 0.000 description 3
- 229910052618 mica group Inorganic materials 0.000 description 3
- 230000015556 catabolic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
Landscapes
- General Induction Heating (AREA)
Description
【発明の詳細な説明】
この発明は、誘導子コイルによる交番磁界中に
置かれた導電性物体、たとえば帯鋼に生ずるうず
電流損、およびヒステリシス損、すなわち誘導子
コイルによる電磁誘導作用によつてこの帯鋼を加
熱する誘導加熱装置に関するもので、特にこの発
明は、たとえば帯鋼のロール成形機による折り曲
げ成形によつて金属パイプ（鍛接管ともいう）を
製作する金属パイプ成形工程中において、上記帯
鋼の両縁部をこの帯鋼の中央部よりも効率よく高
温に加熱し得るようにした誘導加熱装置を提供す
るものである。DETAILED DESCRIPTION OF THE INVENTION This invention deals with eddy current loss and hysteresis loss that occur in a conductive object, such as a steel strip, placed in an alternating magnetic field caused by an inductor coil, that is, by the electromagnetic induction effect caused by an inductor coil. The present invention relates to an induction heating device for heating this steel strip, and in particular, the present invention relates to an induction heating device for heating the steel strip, and in particular, the present invention is directed to the above-mentioned induction heating device during a metal pipe forming process in which a metal pipe (also referred to as a forge-welded pipe) is manufactured by bending the steel strip using a roll forming machine. An object of the present invention is to provide an induction heating device that can heat both edges of a steel strip to a higher temperature more efficiently than the center of the steel strip.
第１図はこの発明の一実施例からなるトランス
バース式誘導加熱装置を示す斜視図である。図に
おいて１ａ，１ｂは搬送装置（図示せず）によつ
て所定速度で搬送される帯鋼などの被加熱物３の
両側に、所定間隔をあけて配設された一対のＥ字
形の積層コアで、この両積層コア１ａ，１ｂの中
央脚にはそれぞれ誘導子コイル２ａ，２ｂが巻装
されている。そして上記積層コア１ａ，１ｂの巾
寸法Cwは、被加熱物３の中央部よりも両縁部を
高温に加熱するために被加熱物３の巾寸法ｗよ
りも大きく形成されており、特にこの発明は次の
ような特殊な構成になつている。 FIG. 1 is a perspective view showing a transverse induction heating device according to an embodiment of the present invention. In the figure, 1a and 1b are a pair of E-shaped laminated cores arranged at a predetermined interval on both sides of a heated object 3 such as a steel band that is transported at a predetermined speed by a transport device (not shown). Inductor coils 2a and 2b are wound around the center legs of both laminated cores 1a and 1b, respectively. The width Cw of the laminated cores 1a and 1b is larger than the width w of the object to be heated 3 in order to heat both edges of the object to be heated 3 to a higher temperature than the center thereof. The invention has the following special configuration.
即ち、誘導子コイル２ａ，２ｂの巻数をＮ、積
層コア１ａ，１ｂを形成する珪素鋼板の厚さを
ｔ、珪素鋼板の占積率をα、コイル印加電圧を
Ecとすると、
Ｅｃ／Ｎ・ｔ／α＜Cw−ｗ ……〔１〕
となるように積層コア１ａ，１ｂの巾寸法Cwを
設定したものである。 That is, the number of turns of the inductor coils 2a and 2b is N, the thickness of the silicon steel plates forming the laminated cores 1a and 1b is t, the space factor of the silicon steel plates is α, and the voltage applied to the coils is
Assuming Ec, the width Cw of the laminated cores 1a and 1b is set so that Ec/N·t/α<Cw−w [1].
次に、上記一方の積層コア１ａについて考える
とき、これの誘導子コイル２ａの巻数をNc、電
源周波数を、コイル印加電圧をEcとすると、
積層コア１ａの中央脚における最大磁束Φｍは次
式で表わされる。 Next, when considering one of the laminated cores 1a, if the number of turns of the inductor coil 2a is Nc, the power supply frequency is Ec, and the voltage applied to the coil is Ec,
The maximum magnetic flux Φm in the central leg of the laminated core 1a is expressed by the following equation.
Φｍ＝１／√２・π・・Ｅｃ／Ｎｃ ……〔２〕
しかしながら、上記積層コア１ａのうち、垂直
方向での被加熱物３の投影部分は、この被加熱物
３に流れるうず電流によつて発生した逆方向磁束
によつて打消され、上記ΦｍはCw−ｗの積層
コアの部分のみに集中する。 Φm=1/√2・π・・Ec/Nc ...[2] However, in the laminated core 1a, the part of the heated object 3 projected in the vertical direction is affected by the eddy current flowing through the heated object 3. This is canceled out by the generated reverse magnetic flux, and the above Φm is concentrated only in the Cw-w laminated core portion.
したがつて、積層コア１ａ，１ｂの巾寸法Cw
と、被加熱物３の巾寸法ｗとが接近すればする
ほど、コア巾のうちCw−ｗの磁束密度が高く
なり上記〔２〕式で示したように、コイル印加電
圧Ec、コイル巻数Ncおよび電源周波数の値に
よつては積層コア１ａ，１ｂを形成する珪素鋼板
間の絶縁が保持できなくなり、絶縁破壊を起して
短絡電流が流れ積層コアを破損するおそれがあつ
た。 Therefore, the width dimension Cw of the laminated cores 1a and 1b
The closer the width dimension w of the heated object 3 is, the higher the magnetic flux density of Cw-w of the core width becomes. Depending on the value of the power supply frequency, the insulation between the silicon steel plates forming the laminated cores 1a and 1b could no longer be maintained, leading to dielectric breakdown and short-circuit current flowing, potentially damaging the laminated cores.
一般に使用されているこの種珪素鋼板の耐圧
は、通常0.5ボルトであり、いま、誘導子コイル
２ａ，２ｂにEcの電圧を印加すると、Cw−ｗ
のコアにはEc／Ncの電圧がコア断面に平行に一
周するように誘起される。そして、珪素鋼板の厚
さをｔとすると、被加熱物３の縁部よりはみ出し
たコア部分の珪素鋼板の枚数は（Cw−ｗ）・
α／ｔとなる（αは珪素鋼板の占積率、ｔは珪素
鋼板の厚さ）。 The withstand voltage of this kind of silicon steel plate that is commonly used is usually 0.5 volts, and now when a voltage of Ec is applied to the inductor coils 2a and 2b, Cw-w
A voltage of Ec/Nc is induced in the core so that it goes around parallel to the core cross section. If the thickness of the silicon steel plate is t, then the number of silicon steel plates in the core part protruding from the edge of the object to be heated 3 is (Cw-w).
α/t (α is the space factor of the silicon steel plate, and t is the thickness of the silicon steel plate).
したがつて珪素鋼板間に誘起される電圧Ｅは次
式で表わされる。 Therefore, the voltage E induced between the silicon steel plates is expressed by the following equation.
Ｅ＝１／２・Ｅｃ／Ｎｃ／（Ｃｗ−ｗ）α／ｔ……
〔３〕
つまり、一般に使用されている珪素鋼板を使用
した第１図に示す誘導加熱装置においては、次式
を満足するように積層コアの形状を選択する必要
がある。 E=1/2・Ec/Nc/(Cw-w)α/t...
[3] That is, in the induction heating device shown in FIG. 1 using a commonly used silicon steel plate, it is necessary to select the shape of the laminated core so as to satisfy the following formula.
１／２・Ｅｃ／Ｎｃ＜0.5×Ｃｗ−ｗ／ｔ×α……
〔４〕
なお、上記〔４〕式において左辺は、珪素鋼板
間の電圧は閉ループを画くので実際はEc／Ncの
1/2の電圧が印加されるという意味である。 1/2・Ec/Nc＜0.5×Cw-w/t×α……
[4] In addition, in the above equation [4], the left side is actually Ec/Nc because the voltage between the silicon steel plates forms a closed loop.
This means that 1/2 the voltage is applied.
以上述べたように、この発明によれば上記
〔４〕式を整理した〔１〕式を満足するように積
層コア１ａ，１ｂの形状と、被加熱物３の関係を
選択すれば、第１図に示すような特殊な積層コア
の使い方をした場合においても、一般的な市販積
層コアを使用した誘導加熱装置を提供することが
可能である。 As described above, according to the present invention, if the shape of the laminated cores 1a, 1b and the relationship between the heated object 3 are selected so as to satisfy the formula [1] which is a rearrangement of the formula [4] above, the first Even when using a special laminated core as shown in the figure, it is possible to provide an induction heating device using a general commercially available laminated core.
第２図はこの発明の他の実施例を示すもので、
これは、被加熱物３からはみ出した積層コア１
ａ，１ｂの各珪素鋼板４間に、たとえばガラスマ
イカシート等の絶縁板５を介在させるようにした
もので、このように構成することによつてその部
分に集中する磁束による誘起電圧で各珪素鋼板間
の絶縁破壊を防止することができる。なお、実験
によれば上記絶縁板５として、集成マイカ0.15t
×２層を各珪素鋼板間に挿入するか、また、ガラ
スマイカシート0.08t×２枚をはさみ込んでも同
様の効果が得られた。 FIG. 2 shows another embodiment of this invention,
This is the laminated core 1 protruding from the heated object 3.
An insulating plate 5 such as a glass mica sheet is interposed between each of the silicon steel plates 4 of a and 1b. With this structure, each silicon is Dielectric breakdown between steel plates can be prevented. According to experiments, the insulating plate 5 was made of laminated mica 0.15t.
A similar effect was obtained by inserting 2 x layers between each silicon steel plate, or by sandwiching 2 x 0.08t glass mica sheets.
第１図はこの発明の一実施例を示す斜視図、第
２図はこの発明の他の実施例を示す断面図であ
る。
図面中、１ａ，１ｂは積層コア、２ａ，２ｂは
誘導子コイル、３は被加熱物、４は珪素鋼板、５
は絶縁板、Cwは積層コアの巾寸法、ｗは被加
熱物の巾寸法である。なお、図中同一符号は同一
部分を示す。
FIG. 1 is a perspective view showing one embodiment of this invention, and FIG. 2 is a sectional view showing another embodiment of this invention. In the drawing, 1a and 1b are laminated cores, 2a and 2b are inductor coils, 3 is an object to be heated, 4 is a silicon steel plate, and 5
is the insulating plate, Cw is the width of the laminated core, and w is the width of the heated object. Note that the same reference numerals in the figures indicate the same parts.
Claims (1)
ルを巻回した積層コアを、金属パイプに成形され
る帯鋼を挾んで対峙させ、該誘導子コイルに高周
波通電を行うことによつて帯鋼の両縁部を主とし
て誘導加熱する誘導加熱装置において、 前記積層コアの巾寸法Ｃwを、前記帯鋼の巾寸
法wより大きくするとともに、 前記誘導子コイルの巻数Ｎ、珪素鋼板の厚さ
ｔ、その占積率α、誘導子コイル印加電圧Ｅcに
対し、 Ｅｃ／Ｎ・ｔ／α＜Ｃw−w で表わされる関係を満たすように各定数を定めた
ことを特徴とする誘導加熱装置。[Claims] 1. A laminated core in which an inductor coil is wound around a plurality of laminated silicon steel plates is placed facing each other across a steel band formed into a metal pipe, and high-frequency current is applied to the inductor coil. In an induction heating device that mainly inductively heats both edges of a steel strip, the width dimension C w of the laminated core is made larger than the width dimension w of the steel strip, and the number of turns N of the inductor coil is For the thickness t of the silicon steel plate, its space factor α, and the voltage applied to the inductor coil Ec , each constant was determined to satisfy the relationship expressed by Ec /Nt/α< Cw − w . An induction heating device featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1184180A JPS56109486A (en) | 1980-02-01 | 1980-02-01 | Induction heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1184180A JPS56109486A (en) | 1980-02-01 | 1980-02-01 | Induction heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS56109486A JPS56109486A (en) | 1981-08-29 |
| JPS6129111B2 true JPS6129111B2 (en) | 1986-07-04 |
Family
ID=11788947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1184180A Granted JPS56109486A (en) | 1980-02-01 | 1980-02-01 | Induction heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS56109486A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017195016A (en) * | 2016-04-18 | 2017-10-26 | Ｊｆｅスチール株式会社 | Iron core for induction heating coil, induction heating coil, and heater |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS531614A (en) * | 1976-06-26 | 1978-01-09 | Toyo Alum Kk | Induction heating equipment |
-
1980
- 1980-02-01 JP JP1184180A patent/JPS56109486A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS531614A (en) * | 1976-06-26 | 1978-01-09 | Toyo Alum Kk | Induction heating equipment |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2017195016A (en) * | 2016-04-18 | 2017-10-26 | Ｊｆｅスチール株式会社 | Iron core for induction heating coil, induction heating coil, and heater |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS56109486A (en) | 1981-08-29 |
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