JPH0375610B2 - - Google Patents
Info
- Publication number
- JPH0375610B2 JPH0375610B2 JP15108887A JP15108887A JPH0375610B2 JP H0375610 B2 JPH0375610 B2 JP H0375610B2 JP 15108887 A JP15108887 A JP 15108887A JP 15108887 A JP15108887 A JP 15108887A JP H0375610 B2 JPH0375610 B2 JP H0375610B2
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- heated
- steel
- contact
- steel material
- 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
- 239000000463 material Substances 0.000 claims description 49
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 12
- 229910000831 Steel Inorganic materials 0.000 description 49
- 239000010959 steel Substances 0.000 description 49
- 230000005611 electricity Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Landscapes
- Control Of Resistance Heating (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、通電加熱方法に係わり、例えばスラ
グ発生、歩留り、品質面の問題から均一無酸化加
熱が必要とされる電磁鋼、SUS等の鋼材の通電
加熱方法に関するものである。Detailed Description of the Invention (Industrial Application Field) The present invention relates to an electrical heating method for electrical steel, SUS, etc., which require uniform oxidation-free heating due to slag generation, yield, and quality issues. The present invention relates to a method for heating steel materials with electricity.
（従来の技術）
移動自在な電極を有し、該電極を被加熱鋼材に
押し付け鋼材を通電加熱する方法においては、鋼
材端面と電極との接触がスポツト的な接触である
ため、接触抵抗が大きい。それゆえ通電電流が面
積の小さいスポツト的接触部のみを流れるので、
接触部でアークが発生し電極が損傷する。(Prior art) In a method that has a movable electrode and presses the electrode against the steel material to be heated and heats the steel material by applying electricity, the contact resistance between the end surface of the steel material and the electrode is spotty, resulting in large contact resistance. . Therefore, the current flows only through spot contacts with a small area, so
Arcing occurs at the contact area and damages the electrode.
特に昇温時間を短くするため加熱開始時から、
最大電流値あるいはそれに近い電流を流す場合に
は、特にアーク発生が激しく、電極が著しく損傷
するという問題点があつた。 In particular, from the start of heating to shorten the temperature rise time,
When a current at or near the maximum current value is passed, there is a problem in that arcing is particularly severe and the electrodes are significantly damaged.
従来一般には、鋼材に対して電極を押し付けて
経時的に電流を増す事によつて、鋼材端面と電極
との接触状態を改善し、つまり接触抵抗を小さく
し、アークを回避しながら通電加熱している。 Conventionally, the contact condition between the edge of the steel material and the electrode is improved by pressing the electrode against the steel material and increasing the current over time. In other words, the contact resistance is reduced, and electrical heating is performed while avoiding arcing. ing.
又、例えば特開昭50−70946公報では、加熱開
始時には鋼材に対する電極の押し付け力を強くす
る事によつて、鋼材と電極間のアーク発生を回避
し、所要加熱後には押し付け力を弱くすることに
より、鋼材の塑性変形を防止する方法を提案して
いる。 Furthermore, for example, Japanese Patent Application Laid-Open No. 70946/1983 discloses that arc generation between the steel material and the electrode is avoided by increasing the pressing force of the electrode against the steel material at the start of heating, and the pressing force is weakened after the required heating. proposed a method to prevent plastic deformation of steel materials.
（発明が解決しようとする問題点）
しかし電極押し付け力が同じでも鋼材端面のプ
ロフイールにより接触状態が異なり、接触状態が
悪い場合にはアーク発生により電極が損傷する。
また、被加熱鋼材が高温になつた時に押し付け力
が強いと、鋼材の変形が生じていた。(Problems to be Solved by the Invention) However, even if the electrode pressing force is the same, the contact condition differs depending on the profile of the end face of the steel material, and if the contact condition is poor, the electrode will be damaged due to arc generation.
Further, if the pressing force is strong when the heated steel material reaches a high temperature, the steel material may be deformed.
鋼材端面状態が個々の鋼材によつて異なるた
め、通電量に対し押し付け力をコントロールする
方法では、アーク発生による電極の損傷や、鋼材
の変形が根本的に解決できていなかつた。 Since the condition of the end face of the steel differs depending on the individual steel, the method of controlling the pressing force with respect to the amount of current cannot fundamentally solve the problems of electrode damage and deformation of the steel due to arcing.
本発明は上記した従来の問答点を解決するもの
で、被加熱材例えば電磁鋼やSUS鋼等の鋼材の
通電加熱法において、電極と被加熱鋼材間で発生
するアークを回避し、かつ押し付けによる被加熱
材の変形を防止する通電加熱法を提供するもので
ある。 The present invention solves the above-mentioned conventional problems, and is aimed at avoiding the arc generated between the electrode and the steel material in the electric heating method of steel materials such as electromagnetic steel and SUS steel, and by avoiding the arc generated between the electrode and the steel material by pressing. The present invention provides an electrical heating method that prevents deformation of a heated material.
（問題点を解決するための手段）
本発明の要旨は、進退自在な電極を被加熱材に
接触させ押付け通電加熱する方法において、電極
と被加熱材の接触抵抗を検出し、予じめ設定した
被加熱材の種別の電極通電部電流密度と接触抵抗
あるいは接触抵抗に見掛け接触部面積を乗した値
の関係により、通電電流値を制御することを特徴
とする通電加熱方法にある。(Means for Solving the Problems) The gist of the present invention is to detect the contact resistance between the electrode and the material to be heated, and to set it in advance in a method of pressing and heating a heated material by bringing an electrode that can move forward and backward into contact with the material to be heated. The current heating method is characterized in that the current value is controlled based on the relationship between the electrode current density and the contact resistance or the product of the contact resistance and the apparent contact area of the type of material to be heated.
次に、本発明方法による通電加熱について説明
する。 Next, electric heating according to the method of the present invention will be explained.
本発明では、電極と被加熱材の押し付け部接触
抵抗を検出するため、接触部の電圧降下量ΔV
（Ｖ）と通電電流Ｉ(A)あるいは通電電流Ｉ(A)を見
掛け接触部面積Ｓ（cm2）で除した通電部電流密度
Ｊ（Ａ／cm2）を検出し、次式で接触抵抗Ｒ（Ω）あ
るいは接触抵抗に見掛けの接触部面積を乗したＲ
×Ｓ（Ω・cm2）を求める。 In the present invention, in order to detect the contact resistance of the pressed part between the electrode and the heated material, the voltage drop ΔV at the contact part is
(V) and the current density J (A/cm 2 ) of the current-carrying part, which is calculated by dividing the current I (A) or the current density I (A) by the apparent contact area S (cm 2 ), and calculate the contact resistance using the following formula. R (Ω) or R, which is the contact resistance multiplied by the apparent contact area
Find ×S (Ω・cm 2 ).
Ｒ（Ω）＝ΔV（Ｖ）／Ｉ(A) ……（１−１）
あるいは
Ｒ・Ｓ（Ω・cm2）＝ΔV（Ｖ）／Ｊ（
Ａ／cm2）……（１−２）
この様にして接触抵抗Ｒ（Ω）あるいはＲ×Ｓ
（Ω・cm2）を求め、つまり電極と被加熱材との接
触状態を把握しながら、通電部電流密度Ｊ（Ａ／
cm2）を調整して通電加熱すると、電極と被加熱材
間でアーク発生がなく、被加熱材にも変形が生じ
ることなく加熱できる。 R (Ω) = ΔV (V) / I (A) ... (1-1) or R・S (Ω・cm 2 ) = ΔV (V) / J (
A/cm 2 )...(1-2) In this way, the contact resistance R (Ω) or R×S
(Ω・cm 2 ), that is, while grasping the contact state between the electrode and the heated material, calculate the current density J (A/
cm 2 ) and conduct current heating, no arc occurs between the electrode and the material to be heated, and the material to be heated can be heated without deformation.
以下に、本発明の一実施例を図面を参照し詳細
に説明する。 Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.
第１図において、１は被加熱材例えば鋼材であ
る。２，２′はそれぞれ被加熱鋼材１の両端に押
し付けられる電極であり、それぞれ押し付け力調
整装置、例えばシリンダー３にピストンロツド４
を介して連結されており、被加熱鋼材１端面に接
触、離脱自在である。 In FIG. 1, numeral 1 indicates a material to be heated, for example, a steel material. Reference numerals 2 and 2' denote electrodes that are pressed against both ends of the steel material 1 to be heated.
It is connected to the heated steel material 1 and can be freely contacted and detached from the end surface of the heated steel material 1.
このシリンダー３の作動により電極２の被加熱
鋼材１端面への押し付け力を調整し制御する。５
−１，５−２，５−３は温度検出機であり、５−
１，５−２は、接触部近傍の温度を測定するため
の電極端面近傍に設置し、５−３は被加熱鋼材の
長手方向中央部の温度を測定できるように設置し
てある。 By operating this cylinder 3, the pressing force of the electrode 2 against the end face of the heated steel material 1 is adjusted and controlled. 5
-1, 5-2, 5-3 are temperature detectors, and 5-
1 and 5-2 are installed near the end faces of the electrodes for measuring the temperature near the contact portion, and 5-3 is installed so as to be able to measure the temperature at the longitudinal center of the heated steel material.
又、６−１，６−２は、接触部の電圧降下量
ΔV（Ｖ）を測定するための電圧検出器であり、
それぞれ被加熱鋼材端面近傍と電極押し付け部間
の電圧降下量が測定できるようにＡ、Ｂ部に設置
してある。 Further, 6-1 and 6-2 are voltage detectors for measuring the voltage drop amount ΔV (V) at the contact part,
They are installed at parts A and B so that the amount of voltage drop between the vicinity of the end face of the heated steel material and the electrode pressing part can be measured, respectively.
この場合Ａ、Ｂ部の個々を測定しないで、どち
らか一方の測定でもよい。あるいは電極２，２′
間の電圧を測定し、被加熱鋼材１の温度T0や通
電電流値Ｉから鋼材中の電圧降下量を算出するこ
とにより、接触部の電圧降下量を求めてもよい。 In this case, it is possible to measure only one of the parts A and B without measuring each part individually. Or electrodes 2, 2'
The amount of voltage drop at the contact portion may be determined by measuring the voltage between the two and calculating the amount of voltage drop in the steel material from the temperature T 0 of the heated steel material 1 and the current value I.
７は電源で、８は通電電流を検出する電流検出
器である。９は通電制御装置で、電圧検出器６−
１，６−２から電圧降下量ΔV（Ｖ）信号、電流
検出器８から通電電流Ｉ(A)、別途に被加熱鋼材１
の電極との接触部面積Ｓ（cm2）が入力される。 7 is a power supply, and 8 is a current detector that detects the current flowing. 9 is an energization control device, and a voltage detector 6-
Voltage drop amount ΔV (V) signal from 1, 6-2, energizing current I (A) from current detector 8, separately heated steel material 1
The contact area S (cm 2 ) with the electrode is input.
該通電制御装置９は前記演算式（１−１）ある
いは（１−２）を行ない、電極２と被加熱鋼材１
間の接触抵抗Ｒ（Ω）あるいは接触抵抗に見掛け
接触部面積を乗したＲ・Ｓ（Ω・cm2）を求める。 The energization control device 9 performs the above calculation formula (1-1) or (1-2), and the electrode 2 and the heated steel material 1
Find the contact resistance R (Ω) between the two or the contact resistance multiplied by the apparent contact area R·S (Ω·cm 2 ).
次いで、予じめ被加熱鋼材１の種類別例えば電
磁鋼、SUS鋼（ステンレス）普通鋼、Ti鋼等に
設定した電極通電部電流密度Ｊ（Ａ／cm2）と、接
触抵抗Ｒ（Ω）あるいは接触抵抗に見掛け接触部
面積を乗したＲ・Ｓ（Ω・cm2）との第２図の線Ｄ
で示す関係により、当該接触抵抗Ｒ（Ω）あるい
は見掛け接触面積当りの接触抵抗Ｒ・Ｓ（Ω・cm2）
の値に応じた電極通電部電流密度Ｊ（Ａ／cm2）と
する制御信号を、電極１の押し付け力調整装置３
あるいは電源調整器７′に出力する。図中Ｃはア
ーク発生限界を示す。 Next, the current density J (A/cm 2 ) of the electrode current-carrying part and the contact resistance R (Ω) are determined in advance for each type of steel material 1 to be heated, for example, electromagnetic steel, SUS steel (stainless steel), ordinary steel, Ti steel, etc. Or line D in Figure 2 between R・S (Ω・cm 2 ), which is the contact resistance multiplied by the apparent contact area.
According to the relationship shown, the contact resistance R (Ω) or the contact resistance per apparent contact area R・S (Ω・cm 2 )
The pressing force adjustment device 3 of the electrode 1 sends a control signal to set the current density J (A/cm 2 ) of the current-carrying part of the electrode according to the value of
Alternatively, it is output to the power regulator 7'. C in the figure indicates the arc generation limit.
このようにして通電加熱すると、電極２と被加
熱鋼材１間でアークが発生せず、電極２の損傷防
止および被加熱鋼材１の損傷と、変形の防止が図
られる。 When electrically heated in this manner, no arc is generated between the electrode 2 and the steel material 1 to be heated, and damage to the electrode 2 and damage to the steel material 1 to be heated 1 can be prevented from being deformed.
なお、T0，T1，T2の温度検出は必須ではな
い。 Note that temperature detection at T 0 , T 1 , and T 2 is not essential.
（実施例）
鋼材の端面が100×300mm2で長さが2000mmの
SUS鋼に、電極面積80×240mm2の電極を押し付け
て通電加熱した場合の電極通電部電流密度Ｊ
（Ａ／cm2）と、接触部接触抵抗Ｒ（Ω）×見掛け接
触面積Ｓ（cm2）との関係で、接触部アーク発生の
有無を調査した。(Example) The end face of the steel material is 100 x 300 mm2 and the length is 2000 mm.
Electrode current density J when pressing an electrode with an electrode area of 80 x 240 mm 2 on SUS steel and heating it with electricity
(A/cm 2 ) and contact resistance R (Ω)×apparent contact area S (cm 2 ), the presence or absence of arcing at the contact portion was investigated.
第２図がその結果であり、電極通電部電流密度
Ｊと接触面積当りの接触抵抗Ｒ×Ｓがある一定関
係Ｄを境界として明確に区別できる。 The results are shown in FIG. 2, and can be clearly distinguished between the current density J of the electrode current-carrying part and the contact resistance R×S per contact area, with a certain relationship D as a boundary.
予じめ設定した前記関係Ｄにより、検出した接
触抵抗に応じて通電電流値を制御して、SUS鋼
の通電加熱を実施したが、接触部のアーク発生は
○印で示すように皆無となり、電極の寿命は従来
の10〜15ヒートから90〜120ヒートへと大幅にの
びた。 According to the preset relationship D, the current value was controlled according to the detected contact resistance to heat the SUS steel, but there was no arcing at the contact area as indicated by the circle. The lifespan of the electrode has been significantly extended from the conventional 10 to 15 heats to 90 to 120 heats.
又、押し付け力も接触抵抗を検出することによ
り、必要最小にして鋼材の変形も大幅に抑制でき
た。 Furthermore, by detecting contact resistance, the pressing force was kept to the minimum necessary and deformation of the steel material could be significantly suppressed.
普通鋼、電磁鋼等の鋼材でも本発明の効果は得
られている。 The effects of the present invention have also been obtained with steel materials such as ordinary steel and electromagnetic steel.
（発明の効果）
本発明によると、以上のように鋼材の通電加熱
において電極との接触部のアーク発生を回避し、
しかも押し付けによる鋼材の変形が防止できるよ
うになつた。(Effects of the Invention) According to the present invention, as described above, arc generation at the contact portion with the electrode is avoided during electrical heating of steel materials,
Moreover, it has become possible to prevent deformation of the steel material due to pressing.
第１図は、本発明の一実施例の説明図、第２図
は、SUS鋼の場合のアーク回避の条件を示す図
表である。
１：被加熱鋼材、２，２′：電極、６−１，６
−２；電圧検出器、７：電源、８：電流検出器、
９：接触抵抗／電極押し付け力制御装置、１０：
制御シグナル、１１：架台。
FIG. 1 is an explanatory diagram of one embodiment of the present invention, and FIG. 2 is a chart showing arc avoidance conditions in the case of SUS steel. 1: Steel material to be heated, 2, 2': Electrode, 6-1, 6
-2; Voltage detector, 7: Power supply, 8: Current detector,
9: Contact resistance/electrode pressing force control device, 10:
Control signal, 11: mount.
Claims (1)
通電加熱する方法において、電極と被加熱材の接
触抵抗を検出し、予じめ設定した被加熱材による
電極通電部電流密度と接触抵抗あるいは接触抵抗
に見掛け接触部面積を乗した値の関係により、通
電電流値を制御することを特徴とする通電加熱方
法。1. In the method of heating the heated material by pressing a movable electrode in contact with the material to be heated, the contact resistance between the electrode and the material to be heated is detected, and the current density of the electrode current-carrying part and the contact resistance or contact by the preset material to be heated are detected. An energization heating method characterized in that the value of the energizing current is controlled based on the relationship between the value obtained by multiplying the resistance by the apparent contact area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15108887A JPS63317621A (en) | 1987-06-19 | 1987-06-19 | Electrical heating method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15108887A JPS63317621A (en) | 1987-06-19 | 1987-06-19 | Electrical heating method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63317621A JPS63317621A (en) | 1988-12-26 |
| JPH0375610B2 true JPH0375610B2 (en) | 1991-12-02 |
Family
ID=15511064
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15108887A Granted JPS63317621A (en) | 1987-06-19 | 1987-06-19 | Electrical heating method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63317621A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5382520B2 (en) * | 2009-09-16 | 2014-01-08 | 高周波熱錬株式会社 | Electric heating device and electric heating method |
| JP5621452B2 (en) * | 2010-09-17 | 2014-11-12 | 富士ゼロックス株式会社 | Image forming apparatus |
| EP3046632B1 (en) | 2013-09-18 | 2018-06-13 | Glymur B.V. | Oral hygiene compositions |
| JP6757553B2 (en) * | 2015-03-31 | 2020-09-23 | 住友重機械工業株式会社 | Molding equipment |
| JP2021073096A (en) * | 2018-03-09 | 2021-05-13 | 住友重機械工業株式会社 | Forming apparatus |
-
1987
- 1987-06-19 JP JP15108887A patent/JPS63317621A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63317621A (en) | 1988-12-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |