JPS63178471A - Manufacture of metallic material - Google Patents
Manufacture of metallic materialInfo
- Publication number
- JPS63178471A JPS63178471A JP894287A JP894287A JPS63178471A JP S63178471 A JPS63178471 A JP S63178471A JP 894287 A JP894287 A JP 894287A JP 894287 A JP894287 A JP 894287A JP S63178471 A JPS63178471 A JP S63178471A
- Authority
- JP
- Japan
- Prior art keywords
- metal material
- temperature
- heating
- current
- current value
- 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.)
- Granted
Links
- 239000007769 metal material Substances 0.000 title claims description 96
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 71
- 238000000034 method Methods 0.000 claims description 29
- 230000020169 heat generation Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 1
- 238000009826 distribution Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 13
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 2
- 229910052721 tungsten Inorganic materials 0.000 description 2
- 239000010937 tungsten Substances 0.000 description 2
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Landscapes
- Control Of Resistance Heating (AREA)
- Powder Metallurgy (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は金属材を直接通電加熱法により加熱する金属材
の製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a method for manufacturing a metal material by heating the metal material by a direct current heating method.
（従来の技術）
例えばタングステンやモリブデンなどの高融点金属から
なる焼結体を加熱するために直接通電加熱法が採用され
ている。(Prior Art) For example, a direct current heating method is employed to heat a sintered body made of a high melting point metal such as tungsten or molybdenum.
この直接通電加熱法（直接抵抗加熱法ともいう。This direct current heating method (also called direct resistance heating method).
以下、通電加熱法と称する。）は、第３図で示す様に金
属材１の両端部を夫々？を極２．２と把持体３．３とで
把持するとともに、各電極２，２を交流電源Ｇに接続し
、交流電源ＧからＮ極２．２を介して金属材１の両端部
間に直接ｍ流を流して金属材１に生じる抵抗発熱を利用
して金属材１自身を加熱する方法である。Hereinafter, this will be referred to as the electrical heating method. ) are the two ends of the metal material 1, respectively, as shown in Fig. 3? is gripped by the pole 2.2 and the gripper 3.3, and each electrode 2,2 is connected to an AC power supply G, and a voltage is applied between both ends of the metal material 1 from the AC power supply G via the N pole 2.2. This is a method in which the metal material 1 itself is heated using the resistance heat generated in the metal material 1 by directly flowing the m current.
しかして、この通電加熱法においては、金属材の全体を
均一な温度分布で加熱し、また金属材を能率的に加熱す
る様に、金属材への通電状態を制御する必要がある。Therefore, in this energization heating method, it is necessary to control the state of energization to the metal material so that the entire metal material is heated with a uniform temperature distribution and the metal material is heated efficiently.
（発明が解決しようとする問題点）
しかして、この様な通電加熱法においては、金属材に流
す電流の電流値と金属材の加熱に必要な時間とは反比例
の関係にある。(Problems to be Solved by the Invention) However, in such an electrical heating method, the current value of the current passed through the metal material and the time required to heat the metal material are in an inversely proportional relationship.
このことから従来加熱の能率向上を図るために、第４図
で示す様に金属材に加熱目標温度に対応した標準電流値
よりも大きい電流値をもつ大電流を流して金属材を短時
間で所定の加熱目標温度まで加熱し加熱時間を短縮する
方法が知られている。Therefore, in order to improve the efficiency of conventional heating, as shown in Figure 4, a large current with a current value larger than the standard current value corresponding to the target heating temperature is passed through the metal material in a short time. A method of shortening the heating time by heating to a predetermined heating target temperature is known.
第４図は金属材の加熱時間（通電時間）と金属材に流す
電流の電流値との関係を示す線図であり、以降説明する
第６図および第１図も同様の線図である。しかし、この
方法によれば、第３図において金属材１の両端部すなわ
ち電極２．２と把持体３．３とで把持した把持部Ａ、Ａ
に隣接した内側の部分Ｂ、Ｂの温度が金属材１の他の部
分の温度に比して部分的に高くなり、すなわち加熱目標
濃度よりＡい温度になり、温度分布が不均一になるとい
う問題がある。この傾向は金属材に流す電流の電ａ（Ｉ
が大きい程顕著である。これは次の理由による。電極２
，２と把持体３．３は水冷構造となっており、金属材１
の把持部Ａ、Ａはこれら各部品により冷却されて温度上
昇しない。しかし、金属材１のＢ、Ｂの部分は電極２，
２と把持体３゜３の接触抵抗の方が前記冷却効果より侵
ために温度上昇する。この場合の金属材の温度分布を第
５図に示す。第５図は金属材の全体における各部の温度
を示す縮図であり、第７図および第２図も同様の線図で
ある。FIG. 4 is a diagram showing the relationship between the heating time (current application time) of the metal material and the current value of the current flowing through the metal material, and FIG. 6 and FIG. 1, which will be described later, are similar diagrams. However, according to this method, in FIG.
The temperature of the inner parts B and B adjacent to the metal material 1 becomes partially higher than the temperature of other parts of the metal material 1, that is, the temperature becomes A higher than the heating target concentration, and the temperature distribution becomes uneven. There's a problem. This tendency is due to the electric current a(I) flowing through the metal material.
The larger the value, the more noticeable it is. This is due to the following reason. Electrode 2
, 2 and the gripping body 3.3 have a water-cooled structure, and the metal material 1
The gripping parts A and A are cooled by these parts and do not rise in temperature. However, the parts B and B of the metal material 1 are the electrodes 2,
The contact resistance between the gripping body 2 and the gripping body 3.degree.3 is stronger than the cooling effect, so the temperature rises. The temperature distribution of the metal material in this case is shown in FIG. FIG. 5 is a miniature diagram showing the temperature of each part of the entire metal material, and FIG. 7 and FIG. 2 are similar diagrams.
これに対する方法として金属材ＡのＢ、Ｂの部分に冷や
し金を設けて冷却し８．Ｂの部分の温度を低下させるこ
とが行なわれている。しかし、この方法では通電加熱装
置が大型となり、その構成が複雑となるという問題があ
る。As a method to deal with this, a chiller is provided at parts B and B of metal material A to cool it.8. Efforts are being made to lower the temperature of part B. However, this method has the problem that the electrical heating device becomes large and its configuration becomes complicated.
そこで、従来は一般的に金属材を短時間に且つ均一な温
度分布で加熱することを目的として、金属材に大ｍｓを
流すことと、小！ｉ流を流すことを組合わせて通電加熱
する方法が採用されている。Conventionally, the aim of heating metal materials in a short period of time and with uniform temperature distribution has been to flow a large amount of ms through the metal material, and to heat the metal material in a short amount of time with a uniform temperature distribution. A method of energization heating in combination with flowing an i current is adopted.
すなわち、この通電加熱法は、第６図で示すように加熱
開始時点から加熱時間の中間時点までの間は、金属材に
加熱目標温度に対応したＩ！準電電流値り大きい電流値
をもつ大Ｎ流を流して金属材を加熱口ａｍ度まで温度上
昇させ、次いで中間時点から加熱終了時点までの間は加
熱口？ｌＩ！１度に対応した標準電流値より小さいｉ！
電流値もつ小Ｎ＠を決して加熱目標温度より低い濃度に
維持する方法である。この方法によれば、金属材に大電
流を流すことにより加熱時間の短縮を図ることができ、
また小電流を流すことにより第７図で示すように金属材
１におけるＢ、Ｂの部分の温度を平滑にして、金属材１
の把持部Ａ、Ａを除く他の部分全体の温度分布を均一に
することができる。That is, in this current heating method, as shown in FIG. 6, from the start of heating to the middle of the heating time, the metal material is heated at I! corresponding to the target heating temperature. A large N current with a current value larger than the quasi-electrical current value is passed to raise the temperature of the metal material to the heating port am degree, and then from the intermediate point to the end of heating, the heating port is heated. lI! i! is smaller than the standard current value corresponding to 1 degree!
This is a method of maintaining a small N@ with a current value at a concentration lower than the heating target temperature. According to this method, heating time can be shortened by passing a large current through the metal material,
In addition, by passing a small current, the temperature of the portions B and B in the metal material 1 is smoothed as shown in FIG.
It is possible to make the temperature distribution uniform throughout the entire portion other than the gripping portions A and A.
しかしながら、この通電加熱法においても次のような問
題点がある。すなわち、金属材１の両端部の把持部Ａ、
Ａの温度が他の部分に比して部分的に低くなる、すなわ
ち加熱目標温度より低い温度になることである。これは
次の理由によるものである。前記したように金属材１の
把持部Ａ、Ａは構造となっているｆｆ１ｉ２．２および
把持体３゜３により冷却されているので、加熱時間の後
半に金属材１に流す電流の′Ｉｌｉ流値を下げて加熱濃
度を下げたｆｆ１Ｍで把持部Ａ、Ａの温度が部分的に低
下するためである。However, this current heating method also has the following problems. That is, the gripping parts A at both ends of the metal material 1,
The temperature of A is partially lower than that of other parts, that is, the temperature is lower than the heating target temperature. This is due to the following reason. As mentioned above, since the gripping parts A and A of the metal material 1 are cooled by the structure ff1i2.2 and the gripping body 3゜3, the 'Ili current of the current flowing through the metal material 1 in the latter half of the heating time is This is because the temperature of the gripping parts A and A partially decreases at ff1M, which lowers the heating concentration by lowering the value.
これに対処するために加熱時間の後半において、Ｎ極２
，２および把持体３．３の金属材１に対する把持力を弱
めて把持部Ａ、Ａの温度低下を抑制するする方法がある
が、この方法は電極２，２と把持体３，３を動かして金
属材１に対する把持状態を調整するための機構と動作が
大変複雑であり、金属材１の両方の把持部Ａ、Ａの温度
分布が均一になるように把持力を調整することが大変困
難であるという欠点がある。To deal with this, in the latter half of the heating time,
, 2 and the gripping bodies 3.3 on the metal material 1 to suppress the temperature drop in the gripping parts A, A. However, this method involves moving the electrodes 2, 2 and the gripping bodies 3, The mechanism and operation for adjusting the gripping state on the metal material 1 are very complicated, and it is very difficult to adjust the gripping force so that the temperature distribution of both gripping parts A and A of the metal material 1 is uniform. It has the disadvantage of being.
本発明は前記事情に基づいてなされたもので、簡単な手
段および装置で金属材を能率良く均一な温度分布で通電
加熱により加熱することができる金属材の製造方法を提
供することを目的とする。The present invention has been made based on the above-mentioned circumstances, and an object of the present invention is to provide a method for manufacturing a metal material that can efficiently heat the metal material with a uniform temperature distribution by electrical heating using simple means and equipment. .
（発明の構成〕
（問題点を解決するための手段と作用）前記目的を達成
するために本発明の金属材の製造方法は、金属材に直接
電流を流して金属材をそれ自身の抵抗発熱により加熱す
るに際して、加熱開始時点から加熱ｖＩ間の中間時点ま
での間は、金属材に一定の電流値すなわち加熱目標温度
に対応した標準電流値よりも大きい電流値の電流を流し
て金属材を一定の温度すなわち加熱目標温度まで温度上
昇させ、次いで金属材に流す電流を中間時点までの電流
値より小さい電流値すなわち加熱目標温度に対応した標
準電′ａｌｌよりも小さい′ＦＲ流値にして金属材を中
間時点までの濃度より低い温度すなわち加熱口ＩＩＡ温
度より低い温度に維持し、さらに加熱終了直前の時点で
金属材に流すｉｉ流の電流値を中間時点までの電流値す
なわち加熱目標温度に対応した標準電流値よりも大きい
電流値に増大して金属材の温度を加熱目標温度まで上昇
させることを特徴とするものである。(Structure of the Invention) (Means and Effects for Solving the Problems) In order to achieve the above-mentioned object, the method for manufacturing a metal material of the present invention is such that a current is directly passed through the metal material to cause the metal material to generate its own resistance heat generation. When heating the metal material, from the start of heating to the intermediate point between heating vI, a current with a constant current value, that is, a current value larger than the standard current value corresponding to the heating target temperature, is passed through the metal material. The temperature is raised to a constant temperature, that is, the heating target temperature, and then the current flowing through the metal is set to a current value smaller than the current value up to the intermediate point, that is, a FR current value smaller than the standard voltage 'all corresponding to the heating target temperature. The metal is maintained at a temperature lower than the concentration up to the intermediate point, that is, lower than the heating port IIA temperature, and further, the current value of the current flow II flowing through the metal material at the point just before the end of heating is adjusted to the current value up to the intermediate point, that is, the heating target temperature. It is characterized by increasing the current value to a value larger than the corresponding standard current value to raise the temperature of the metal material to the heating target temperature.
以下本発明について説明する。The present invention will be explained below.
本発明により直接通電加熱法により金属材を加熱する方
法について説明する。この説明では第１図で示すように
金属材１として高融点金属の焼結体を通電加熱する場合
を例にとる。第１図は金属材への通電状態を示す線図、
第２図は金属材の加熱温度分布を示す線図である。A method of heating a metal material by a direct current heating method according to the present invention will be explained. In this explanation, as shown in FIG. 1, a case will be taken as an example in which a sintered body of a high melting point metal is electrically heated as the metal material 1. Figure 1 is a diagram showing the state of energization to metal materials,
FIG. 2 is a diagram showing the heating temperature distribution of a metal material.
第１図で示すように加熱開始時点Ｓ１から加熱時間の中
間時点＄２までの時間は、交流電源Ｇにより電極２．２
を介して金属材１に所定の電流値■すなわち加熱目標温
度に対応した標準電流値よりも大きい電流値を持つ電流
（大電流）を直接流し、金属材１に生じる抵抗熱により
金属材１を第２図で示す所定の１１ｊＴ （加熱口１温
度）まで温度上昇させる。As shown in FIG.
A current (large current) having a predetermined current value (i.e., a current value larger than the standard current value corresponding to the heating target temperature) is directly passed through the metal material 1 through the metal material 1, and the metal material 1 is heated by the resistance heat generated in the metal material 1. The temperature is raised to a predetermined temperature of 11jT (heating port 1 temperature) shown in FIG.
次に中間時点Ｓ２から加熱終了時点に近い所定の時点Ｓ
３までの時間は、前記中間時点Ｓ１までに金属材１に流
す電流の電流値Ｉよりも小さい所定の電流値Ｉ′すなわ
ち加熱口Ｉｌ！温度に対応した標準電流値よりも小さい
電流値をもつＮ流を金属材１に流す。このため、金属材
１は前記中間時点Ｓ２までの金属材１の温度Ｔよりも低
い所定の温度Ｔ′すなわち加熱口ｍ１度より低い温度ま
で温度低下し、この温度Ｔ′に維持される。ここで、金
属材・１における把持部Ａ、Ａに隣接する部分Ｂ。Next, a predetermined time S close to the heating end time from the intermediate time S2
3 is a predetermined current value I' that is smaller than the current value I of the current flowing through the metal material 1 up to the intermediate point S1, that is, the heating port Il! An N current having a current value smaller than a standard current value corresponding to the temperature is passed through the metal material 1. Therefore, the temperature of the metal material 1 decreases to a predetermined temperature T' lower than the temperature T of the metal material 1 up to the intermediate point S2, that is, a temperature lower than the heating port m1 degrees, and is maintained at this temperature T'. Here, grip part A in metal material 1, and part B adjacent to A.
Ｂは、前記中間時点Ｓ２までに電流値Ｉの電流が流れて
いた時に金属材１の温度下よりも高い温度に部分的に温
度上昇していたが、金属材１の温度がＴ′まで低下する
ことにより金属材１の中央部分と同じ温度Ｔ′まで温度
低下する。In B, when the current of current value I was flowing by the intermediate point S2, the temperature had partially risen to a temperature higher than the temperature of the metal material 1, but the temperature of the metal material 1 decreased to T'. As a result, the temperature is lowered to the same temperature T' as the central portion of the metal material 1.
さらに、前記時１点Ｓ３から加熱終了時点Ｓ４までの時
間には、前記中間時点Ｓ２まで金属材１に流していた電
流の電流値と同じ大きさの電流値Ｉすなわち加熱口４１
！温度に対応した標準電流値より大きい電流値をもつ電
流を金属材１に再び流す。Furthermore, during the time from the first point S3 to the heating end point S4, the current value I of the current that has been flowing through the metal material 1 up to the intermediate point S2 is the same as that of the heating port 41.
! A current having a current value larger than the standard current value corresponding to the temperature is passed through the metal material 1 again.
このため、金属材１は温度Ｔ−から前記中間時点Ｓ２ま
での金属材１の温度と同じ高さの温度Ｔすなわち加熱目
標温度まで温度上昇する。ここで、金属材１の把持部Ａ
、Ａは、前記中間時点Ｓ２から時点＄３までの間に金属
材１の温度がＴ′まで低下していた時に金属材１の把持
部Ａ、Ａの温度が王よりも低い温度に低下していたが、
金属材１の温度が再びＴまで上昇することにより金属材
１の他の部分と同じ温度下まで温度上昇する。Therefore, the temperature of the metal material 1 rises from the temperature T- to a temperature T that is the same as the temperature of the metal material 1 up to the intermediate time point S2, that is, the heating target temperature. Here, grip part A of metal material 1
, A indicates that when the temperature of the metal material 1 has decreased to T' between the intermediate time point S2 and the time point $3, the temperature of the gripping parts A and A of the metal material 1 has decreased to a temperature lower than that of the grip part A. was, but
When the temperature of the metal material 1 rises to T again, the temperature rises to the same temperature as other parts of the metal material 1.
このように金属材１に流す電流を制御し通電加熱を行な
うと、金属材１の把持部Ａ、Ａ、部分Ｂ。When the electric current applied to the metal material 1 is controlled in this manner and the current is applied and heated, the gripping portions A, A, and portions B of the metal material 1 are heated.
Ｂおよび中央部が揃って加熱目標瀉１ｔＴとなり、均一
な温度分布で金属材１を加熱できる。また、金属材１の
加熱目標温度に対応した′電流値よりも大きな電流値の
電流を金属材１に流すので、金属材１の加熱時間を短縮
することができる。また、金属材１の把持部Ａ、Ａの温
度低下を防止するために、電極２．２および把持体３，
３による把持力を調節する必要がなく、把持力を調節す
るための機構および操作が不要で構造面および操作面で
大変有利である。さらに、他の方法である金属材１のＢ
、Ｂの部分にこれを冷却するための冷やし金を設ける必
要がない。このため通電加熱装置の構成が簡素となり、
また小型化される。The heating target temperature of B and the central portion is 1tT, and the metal material 1 can be heated with a uniform temperature distribution. Further, since a current having a larger current value than the current value corresponding to the heating target temperature of the metal material 1 is passed through the metal material 1, the heating time of the metal material 1 can be shortened. In addition, in order to prevent the temperature of the gripping parts A and A of the metal material 1 from decreasing, the electrode 2.2 and the gripping body 3,
There is no need to adjust the gripping force by the gripping force 3, and there is no need for a mechanism or operation for adjusting the gripping force, which is very advantageous in terms of structure and operation. Furthermore, B of metal material 1 which is another method
, There is no need to provide a chiller for cooling parts B. This simplifies the configuration of the current heating device,
It will also be made smaller.
なお、本発明は高融点金属の焼結体を直接通電加熱する
場合に限定されず、他の金属材を直接通電加熱する場合
に広く適用することができる。Note that the present invention is not limited to the case where a sintered body of a high-melting point metal is directly heated by electricity, but can be widely applied to the case where other metal materials are directly heated by electricity.
（実施例）
直径１３履、長さ７００−のタングステン焼結体を直接
通電加熱法により加熱した。加熱目標温度は１４００℃
、焼結体に流す電流の標準電流値は２６０ＯＡである。(Example) A tungsten sintered body having a diameter of 13 mm and a length of 700 mm was heated by a direct current heating method. Heating target temperature is 1400℃
The standard current value of the current flowing through the sintered body is 260OA.
本発明例として、電流値を３５００Ａ、２４０ＯＡ、３
５００Ａの３段階に分けて電流を焼結体に流した。この
結果加熱時間は２５秒であり、焼結体の全体を１４００
℃の均一な温度分布で加熱できた。As an example of the present invention, the current values are 3500A, 240OA, 3
A current of 500 A was applied to the sintered body in three stages. As a result, the heating time was 25 seconds, and the entire sintered body was
Heating was possible with a uniform temperature distribution of °C.
従来例として、電流値を３５００Ａ、２４０ＯＡの２段
階に分けて電流を焼結体に流した。この結果加熱時間は
２０秒であった。焼結体の温度分布は、把持部Ａ、Ａが
１１４０℃、他の部分が１４００℃で、把持部Ａ、Ａの
温度の低下を生じた。As a conventional example, current was divided into two stages of 3500 A and 240 OA, and the current was passed through the sintered body. As a result, the heating time was 20 seconds. The temperature distribution of the sintered body was 1140° C. in the gripping portions A and 1400° C. in the other portions, resulting in a decrease in the temperature of the gripping portions A and A.
以上説明したように本発明の金属材の製造方法によれば
、大電流と小電流を組合わせた３段階の通電を行なう直
接通電加熱法により、簡単な手段および装置で能率良く
且つ均一な温度分布で金属材を通電加熱することができ
る。As explained above, according to the method for manufacturing metal materials of the present invention, by using a direct current heating method that performs three stages of energization that combines large current and small current, temperature can be efficiently and uniformly achieved using simple means and equipment. It is possible to heat metal materials by applying electricity in a distributed manner.
第１図および第２図は本発明方法を示し、第１図は金属
材に対する通電状態を示す線図、第２図は金属材の加熱
温度分布を示す線図、第３図は直接通電加熱法を示す説
明図、第４図および第５図は従来例を示し、第４図は金
属材に対する通電状態を示す縮図、第５図は金属材の加
熱温度分布を示す線図、第６図および第７図は異なる従
来例を示し、第６図は金属材に対する通電状態を示す線
図、第７図は金属材の加熱温度分布を示す線図である。
１・・・焼結体、２・・・ＮＩｌ、３・・・把持体。
出願人代理人 弁理土鈴江武彦
第１図
金Ａ村の長？
第２図
第３因
時開
第４図
第５図Figures 1 and 2 show the method of the present invention, Figure 1 is a diagram showing the state of energization to metal materials, Figure 2 is a diagram showing the heating temperature distribution of metal materials, and Figure 3 is direct energization heating. Fig. 4 and Fig. 5 are explanatory diagrams showing the conventional method, Fig. 4 is a miniature diagram showing the energization state to the metal material, Fig. 5 is a diagram showing the heating temperature distribution of the metal material, and Fig. 6 7 shows a different conventional example, FIG. 6 is a diagram showing the state of energization to the metal material, and FIG. 7 is a diagram showing the heating temperature distribution of the metal material. 1... Sintered body, 2... NIl, 3... Gripping body. Applicant's attorney: Takehiko Suzue, figure 1, head of Kim A village? Figure 2 Figure 3 Time distribution Figure 4 Figure 5
Claims (1)
により加熱するに際して、加熱開始時点から加熱時間の
中間時点までの間は、前記金属材に一定の電流値の電流
を流して前記金属材を一定の温度まで温度上昇させ、次
いで前記金属材に流す電流を前記中間時点までの電流値
より小さい電流値にして前記金属材を前記中間時点まで
温度より低い温度に維持し、さらに加熱終了直前の時点
で前記金属材に流す電流の電流値を前記中間時点までの
電流値と同じ大きさの電流値に増大して前記金属材の温
度を上昇させることを特徴とする金属材の製造方法。When a metal material is heated by its own resistance heat generation by passing a current directly through the metal material, from the start of heating to the middle of the heating time, a current of a constant value is passed through the metal material to heat the metal material. Raise the temperature of the material to a certain temperature, then set the current flowing through the metal material to a current value smaller than the current value up to the intermediate point, maintain the metal material at a temperature lower than the temperature until the intermediate point, and then end the heating. A method for manufacturing a metal material, characterized in that the temperature of the metal material is raised by increasing the current value of the current flowing through the metal material at the immediately preceding point to a current value of the same magnitude as the current value up to the intermediate point. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP894287A JPH07105261B2 (en) | 1987-01-20 | 1987-01-20 | Manufacturing method of metal material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP894287A JPH07105261B2 (en) | 1987-01-20 | 1987-01-20 | Manufacturing method of metal material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63178471A true JPS63178471A (en) | 1988-07-22 |
| JPH07105261B2 JPH07105261B2 (en) | 1995-11-13 |
Family
ID=11706723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP894287A Expired - Lifetime JPH07105261B2 (en) | 1987-01-20 | 1987-01-20 | Manufacturing method of metal material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07105261B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011515572A (en) * | 2008-01-29 | 2011-05-19 | 本田技研工業株式会社 | Heat treatment and stamping system and method for thin steel sheet |
| JP2019150851A (en) * | 2018-03-02 | 2019-09-12 | 住友重機械工業株式会社 | Molding device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020095775A (en) * | 2017-03-29 | 2020-06-18 | 住友重機械工業株式会社 | Electric heating device |
-
1987
- 1987-01-20 JP JP894287A patent/JPH07105261B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011515572A (en) * | 2008-01-29 | 2011-05-19 | 本田技研工業株式会社 | Heat treatment and stamping system and method for thin steel sheet |
| JP2019150851A (en) * | 2018-03-02 | 2019-09-12 | 住友重機械工業株式会社 | Molding device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07105261B2 (en) | 1995-11-13 |
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