JP5108283B2 - Metal wire heating device - Google Patents

Metal wire heating device Download PDF

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JP5108283B2
JP5108283B2 JP2006321731A JP2006321731A JP5108283B2 JP 5108283 B2 JP5108283 B2 JP 5108283B2 JP 2006321731 A JP2006321731 A JP 2006321731A JP 2006321731 A JP2006321731 A JP 2006321731A JP 5108283 B2 JP5108283 B2 JP 5108283B2
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metal wire
wire
electrodes
electrode
energization
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JP2008133522A (en
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盛男 富田
智生 山崎
恒孝 竹内
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Neturen Co Ltd
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この発明は、金属線材を通電加熱によって加熱処理をする金属線材加熱装置に関するものである。   The present invention relates to a metal wire heating apparatus that heat-treats a metal wire by electric heating.

ハイス代替IC検査プローブピンなどに用いられる極細線(例えば径0.1〜0.3mm)の超高硬度合金線は、加熱、冷却の熱処理(時効処理)を経て高い強度特性を得ることができる。例えば、耐食性に優れたNi基合金線は、冷間加工+時効処理により粉末ハイス相当の800〜900Hvもの硬さが得られ、この超高硬度特性によりSUS440Cと同等の優れた耐磨耗性をも示す。すなわち、上記熱処理によってNi基合金線特有の耐食性・非磁性(透磁率μ<1.01)を維持しながら極めて高い硬さを得ることが可能になる。   Ultra-high-hardness alloy wire (for example, 0.1 to 0.3 mm in diameter) used for high-speed IC inspection probe pins and the like can obtain high strength characteristics through heating and cooling heat treatment (aging treatment). . For example, a Ni-based alloy wire with excellent corrosion resistance has a hardness of 800 to 900 Hv equivalent to powder high speed by cold working + aging treatment, and this ultra-high hardness characteristic has excellent wear resistance equivalent to SUS440C. Also shown. That is, the above heat treatment makes it possible to obtain extremely high hardness while maintaining the corrosion resistance and non-magnetism (magnetic permeability μ <1.01) peculiar to Ni-based alloy wires.

上記した熱処理の一方法としては、バッチ炉加熱により時間をかけて処理する方法(例えば1Hr以上)があるが、処理に長時間を要するという問題がある。これに対し短時間時効処理を可能にするものとして、加熱された管状炉内で線材を走行させて熱処理を行うものが提案されている(例えば特許文献1、特許文献3参照)。また、この他に線材を直接通電加熱することで短時間で熱処理を行う方法も提案されており(例えば特許文献1、2、3参照)、特許文献2では、ロール状の電極間に線材を掛け渡し、該線材を電極間で走行させつつ電極間に通電して連続的に加熱する装置が示されている。
特開2002−339050号公報(段落0034、段落0037) 特開平5−70850号公報 特開2002−129262号公報
As one method of the above heat treatment, there is a method (for example, 1 Hr or more) in which processing is performed over time by batch furnace heating, but there is a problem that processing takes a long time. On the other hand, what enables a heat treatment by running a wire rod in a heated tubular furnace has been proposed as enabling short-term aging treatment (see, for example, Patent Document 1 and Patent Document 3). In addition to this, a method of performing heat treatment in a short time by directly energizing and heating the wire has also been proposed (see, for example, Patent Documents 1, 2, and 3). In Patent Document 2, a wire material is placed between roll-shaped electrodes. An apparatus is shown in which the wire material is continuously heated by being energized between the electrodes while being run between the electrodes.
JP 2002-339050 A (paragraph 0034, paragraph 0037) JP-A-5-70850 JP 2002-129262 A

上記従来の熱処理の方法のうち、通電加熱を連続的に加熱する方法が最も効率的といえる。しかし、細線の熱処理では、走行する線材とロール状の電極との間の接触状態が変化しやすく通電抵抗が変わって安定した通電加熱を行うことが難しいという問題がある。特に極細線になるとロール状電極と線材との電気的な接触を安定させることが難しく、熱処理がむらになって線材の線方向において特性にばらつきが生じてしまうという問題がある。
また、線材を走行させつつ通電加熱を行うと、その間に線材が部分的に熱膨張、熱収縮してしまい、様々な方向への曲げくせなどが生じて線材の直線性が良好に維持されないという問題がある。この場合、熱処理後に矯正処理を行うことが必要になり、作業負担が大きくコスト高になるという問題がある。
Among the above conventional heat treatment methods, the method of continuously heating the electric heating can be said to be the most efficient. However, in the heat treatment of thin wires, there is a problem that the contact state between the traveling wire and the roll-shaped electrode is likely to change, and it is difficult to perform stable energization heating because the energization resistance changes. In particular, in the case of an ultrafine wire, it is difficult to stabilize the electrical contact between the roll electrode and the wire, and there is a problem that the heat treatment becomes uneven and the characteristics vary in the wire direction of the wire.
Also, when conducting heating while running the wire, the wire partially expands and contracts in the meantime, causing bending in various directions and the linearity of the wire is not maintained well. There's a problem. In this case, it is necessary to perform a straightening process after the heat treatment, and there is a problem that the work load is large and the cost is high.

本発明は、上記事情を背景としてなされたものであり、線材を効率的に熱処理するとともに該線材を線方向において均一に熱処理することを可能にし、さらには金属線材の直線性を良好に維持することができる金属線材加熱装置を提供することを目的とする。   The present invention has been made against the background of the above circumstances, and enables efficient heat treatment of the wire material, heat treatment of the wire material uniformly in the wire direction, and good maintenance of the linearity of the metal wire material. An object of the present invention is to provide a metal wire heating device that can be used.

すなわち、本発明の金属線材加熱装置のうち、第1の発明は、金属線材を線送りにより間欠的に移送する線材移送装置と、前記金属線材に対し離接可能であって前記間欠移送の停止時に前記金属線材の線方向において距離を隔てて該金属線材に接触可能な対の電極と、該電極間に通電する通電装置とを備え、前記線材移送装置は、前記電極による前記金属線材への通電と該金属線材の冷却とが間欠移送の停止時間中になされるように間欠的な移送を行うものであることを特徴とする。 That is, among the metal wire heating devices of the present invention, the first invention is a wire rod transfer device for intermittently transferring a metal wire rod by wire feed, and can be separated from and connected to the metal wire rod, and the intermittent transfer is stopped. Sometimes a pair of electrodes that can contact the metal wire at a distance in the wire direction of the metal wire, and an energizing device that energizes between the electrodes , the wire transfer device is provided to the metal wire by the electrode energized and the cooling of the metal wire rod, characterized in der Rukoto performs intermittent transport as is done during the downtime of the intermittent transport.

本発明によれば、線材移送装置により間欠的に移送される際に停止をしている金属線材に、対となる電源を線方向に距離を隔てて接触させて通電装置により通電することで、金属線材が通電加熱され、加熱後冷却により所望の熱処理がなされる。通電時には、金属線材は移送されることなく停止をしており、電極が金属線材に確実に接触して安定した通電加熱がなされる。部分的に熱処理が終了した金属線材は、上記線材移送装置によってさらに間欠的に移送され、再度、停止後に上記熱処理が行われる。この動作を繰り返すことで金属線材は線方向において連続的に安定して熱処理される。
また、上記発明によれば、間欠移送の停止時に通電加熱と冷却を終了して、金属線材の移送時における金属線材の熱膨張および熱収縮を避けることができ、金属線材の直線性をより良好に維持することができる。
According to the present invention, the metal wire that is stopped when being intermittently transferred by the wire transfer device is brought into contact with the pair of power sources at a distance in the wire direction and energized by the energization device, The metal wire is energized and heated, and a desired heat treatment is performed by cooling after heating. At the time of energization, the metal wire is stopped without being transferred, and the electrode is reliably in contact with the metal wire and stable energization heating is performed. The metal wire that has been partially heat-treated is further intermittently transferred by the wire-feeding device, and the heat-treatment is again performed after stopping. By repeating this operation, the metal wire is heat-treated continuously and stably in the wire direction.
In addition, according to the above invention, when the intermittent transfer is stopped, the energization heating and cooling are terminated, and the thermal expansion and contraction of the metal wire during the transfer of the metal wire can be avoided, and the linearity of the metal wire is better. Can be maintained.

さらに、第2の発明の金属線材加熱装置は、第1の発明において、前記線材移送装置が、間欠的な移送の一動作において、前記対の電極のうち上流側の電極が接触した前記金属線材の一部分とその線方向内側近傍が、下流側の電極が接触する位置の上流側近傍に移動するように線送りするものであることを特徴とする。 Furthermore, the metal wire heating device of the second invention is the metal wire material according to the first invention, wherein the wire transfer device is in contact with an upstream electrode of the pair of electrodes in one operation of intermittent transfer. A part of the wire and its vicinity in the line direction are line-feeded so as to move to the vicinity of the upstream side of the position where the downstream electrode contacts .

第3の発明の金属線材加熱装置は、金属線材を線送りにより間欠的に移送する線材移送装置と、前記金属線材に対し離接可能であって前記間欠移送の停止時に前記金属線材の線方向において距離を隔てて該金属線材に接触可能な対の電極と、該電極間に通電する通電装置とを備え、前記線材移送装置は、間欠的な移送の一動作において、前記対の電極のうち上流側の電極が接触した前記金属線材の一部分とその線方向内側近傍が、下流側の電極が接触する位置の上流側近傍に移動するように線送りするものであることを特徴とする。 According to a third aspect of the present invention, there is provided a metal wire heating device including: a wire rod transfer device that intermittently transfers a metal wire by wire feed; and a wire direction of the metal wire that can be separated from and contacted with the metal wire when the intermittent transfer stops A pair of electrodes that can contact the metal wire at a distance from each other and an energization device that energizes between the electrodes. A part of the metal wire rod in contact with the upstream electrode and the inner side in the line direction are wire-fed so as to move to the upstream vicinity of the position in contact with the downstream electrode.

上記発明によれば、通電加熱時に電極に接触して昇温が殆どなされなかった部分と、電極に近くて十分に昇温がなされなかった前記部分の近傍とが、次の通電加熱に際し、確実に加熱がされて良好な熱処理がなされる。これにより金属線材に無駄が生じることなく歩留まりよく、かつ線方向に均等に熱処理がなされる。なお、前記近傍は二度の加熱処理を受けることになるが、二度目の加熱が十分になされることで一度の加熱処理がなされる部分と殆ど異なることなく良好な熱処理がなされる。   According to the above-described invention, the portion where the temperature is hardly increased due to contact with the electrode during energization heating and the vicinity of the portion where the temperature is not sufficiently increased near the electrode are reliably determined during the next energization heating. Is heated and a good heat treatment is performed. As a result, heat treatment is performed uniformly in the wire direction with good yield without waste in the metal wire. Although the vicinity is subjected to two heat treatments, the second heat is sufficiently performed, so that a good heat treatment is performed with almost no difference from the portion where the one heat treatment is performed.

なお、二度の加熱を受ける前記上流側電極接触部分の近傍の範囲は、電極に近くて十分な加熱(昇温)がなされておらず、熱処理が不十分な範囲を選択すればよい。該範囲は、線材の材質や線径、通電量、加熱温度などの影響を受けるため、処理内容毎に個別に選択すればよい。また、この上流側の近傍範囲を下流側の電極側に移送して次の通電加熱を行う際には、下流側の電極に隣接する上流側範囲では同様に十分な加熱がなされないため、下流側の電極の近傍範囲を避けて、その上流側に位置させて通電加熱を行うのが望ましい。この下流側の電極の近傍範囲も、電極に近くて十分な加熱(昇温)がなされず、熱処理が不十分となる範囲を選択すればよい。この場合も線材の材質や線径、通電量、加熱温度などの影響を受けるため、処理内容毎に個別に選択すればよい。通常は、上流側電極における近傍範囲とほぼ同じ長さの範囲となる。   It should be noted that the range in the vicinity of the upstream electrode contact portion that receives the heating twice may be selected as a range in which sufficient heating (temperature increase) is not performed near the electrode and heat treatment is insufficient. Since the range is affected by the material of the wire, the wire diameter, the energization amount, the heating temperature, etc., it may be selected individually for each processing content. In addition, when the adjacent area on the upstream side is transferred to the downstream electrode side and the next energization heating is performed, the upstream area adjacent to the downstream electrode is similarly not sufficiently heated. It is desirable to carry out the energization heating while avoiding the vicinity of the side electrode and positioning it on the upstream side. The range near the electrode on the downstream side may also be selected so that sufficient heating (temperature increase) is not performed near the electrode and the heat treatment is insufficient. Also in this case, since it is influenced by the material of the wire, the wire diameter, the energization amount, the heating temperature, etc., it may be selected individually for each processing content. Usually, the length is almost the same as the vicinity of the upstream electrode.

第4の発明の金属線材加熱装置は、第1〜第3の発明のいずれかにおいて、少なくとも前記電極への通電時に、前記電極間の金属線材に張力を付与する線材張力付与装置を備えることを特徴とする。   According to a fourth aspect of the present invention, there is provided the metal wire heating device according to any one of the first to third aspects, further including a wire tension applying device that applies tension to the metal wire between the electrodes at least during energization of the electrodes. Features.

上記発明によれば、電極への通電時に、線材張力付与装置によって前記電極間の金属線材に張力を付与することにより、熱処理に際し金属線材による熱変形が生じても金属線材の直線性を良好に維持することができ、後の矯正処理を不要にしたり、矯正処理の負担を軽減する。なお、金属線材に付与する張力は、金属線材の材質や線径に基づいて設定することができる。例えば、0.1mm径の金属線材には0.5kgの張力を付与し、0.5mm径の金属線材には1.0kgの張力を付与するように、線径によって張力を調整することができる。   According to the above invention, by applying tension to the metal wire between the electrodes by the wire tension applying device when the electrode is energized, the linearity of the metal wire is improved even if thermal deformation occurs due to the metal wire during heat treatment. It can be maintained, eliminating the need for a subsequent correction process or reducing the burden of the correction process. In addition, the tension | tensile_strength provided to a metal wire can be set based on the material and wire diameter of a metal wire. For example, the tension can be adjusted by the wire diameter so that a tension of 0.5 kg is applied to a metal wire having a diameter of 0.1 mm and a tension of 1.0 kg is applied to a metal wire having a diameter of 0.5 mm. .

第5の発明の金属線材加熱装置は、第4の発明において、前記対の電極の一方または両方が金属線材を保持して前記線方向に沿って移動可能とされており、前記線材張力付与装置は、前記移動が可能とされた電極に移動方向に応力を加えて前記張力を付与するものであることを特徴とする。 Fifth metal wire heating apparatus of the present invention is directed to the fourth invention, one or both of the pair of electrodes holding the metal wire rod and is movable along the line direction, said wire tensioning device Is characterized in that the tension is applied by applying a stress in the moving direction to the electrode which is enabled to move.

上記発明によれば、金属線材を保持する移動可能な電極に移動応力を与えることで金属線材に容易に張力を付与して金属線材の直線性を維持することができる。なお、応力の付与は、ウェイトの自重を利用したものやサーボモータなどの駆動力を利用したものにより行うことができ、本発明としては特定のものに限定されない。また、電極の移動により張力を付与する場合、電極はいずれか一方または両方を上記のように移動可能とすることができるが、上流側の電極は固定して、下流側の電極のみを移動可能とするのが望ましい。これは上流側の電極が移動すると、その上流側で線材がコイル状に巻き取られている場合、上記移動によって巻きずれが発生するなどの問題が生じやすくなるためである。   According to the said invention, tension | tensile_strength can be easily provided to a metal wire by giving a movement stress to the movable electrode holding a metal wire, and the linearity of a metal wire can be maintained. The application of stress can be performed by using the weight of the weight or by using a driving force such as a servo motor, and the present invention is not limited to a specific one. When tension is applied by moving the electrode, either one or both of the electrodes can be moved as described above, but the upstream electrode can be fixed and only the downstream electrode can be moved. Is desirable. This is because when the upstream electrode moves, if the wire is wound in a coil shape on the upstream side, problems such as winding deviation are likely to occur due to the movement.

第6の発明の金属線材加熱装置は、第1〜第5の発明のいずれかにおいて、前記対の電極間の金属線材の周囲を囲む包囲筒体を備えることを特徴とする。   According to a sixth aspect of the present invention, there is provided the metal wire heating device according to any one of the first to fifth aspects, further comprising an enclosing cylinder surrounding the metal wire between the pair of electrodes.

上記発明によれば、上記通電加熱、冷却に際しては金属線材の周囲が包囲筒体で囲まれているので、空気の流れなどによる環境の変化を受けにくく、安定して金属線材の線方向で均等な熱処理がなされ、特性のばらつきが小さい処理済みの金属線材を得ることが可能になる。なお、包囲筒体は、金属線材の加熱、冷却においても損傷を生じないように耐熱性を有するものが望ましく、石英製などのものを用いることができる。また、包囲筒体は、金属線材の周囲を完全に囲むものの他、一部で開放されているものであってもよいが、周囲の環境の変化を回避するためには、周囲全体を完全に囲むものが望ましい。   According to the above invention, since the surroundings of the metal wire are surrounded by the surrounding cylindrical body during the energization heating and cooling, the metal wire is not easily changed by an air flow or the like, and is stable and even in the wire direction of the metal wire. Thus, it is possible to obtain a treated metal wire with small variations in characteristics. The surrounding cylinder is preferably heat-resistant so as not to be damaged even when the metal wire is heated and cooled, and quartz or the like can be used. In addition, the enclosing cylinder may be a part of the metal wire that completely surrounds the periphery of the metal wire, or may be open in part, but in order to avoid changes in the surrounding environment, the entire periphery is completely Surrounding things are desirable.

第7の発明の金属線材加熱装置は、第6の発明において、前記包囲筒体内の強制通気を行う通気装置を備えることを特徴とする。 According to a seventh aspect of the present invention, there is provided the metal wire heating device according to the sixth aspect, further comprising a ventilation device that performs forced ventilation in the surrounding cylindrical body.

上記発明によれば、熱処理時の冷却に際し、包囲筒体内の昇温された雰囲気を強制的に通気することで金属線材周囲の環境温度を強制的に降温させて冷却効率を高める。
金属線材の周囲に包囲筒体を配置することで上記したように環境の変化を受けにくくなるものの、冷却時には包囲筒体による保温作用が現れて冷却効率が悪くなるが、上記のように強制的な通気によりこれを解消することができる。また、強制的な通気によって、金属線材の冷却が線方向で均等になされ、熱処理効果の均等性が向上する。
According to the above-described invention, when cooling at the time of heat treatment, the ambient temperature around the metal wire is forcibly lowered by forcibly ventilating the heated atmosphere in the surrounding cylindrical body, thereby improving the cooling efficiency.
Although the surrounding cylinder is less likely to be subject to environmental changes as described above by placing the surrounding cylinder around the metal wire, the thermal insulation effect due to the surrounding cylinder appears at the time of cooling, but the cooling efficiency deteriorates. This can be eliminated by proper ventilation. Further, the forced ventilation allows the metal wire to be cooled uniformly in the line direction, and the uniformity of the heat treatment effect is improved.

第8の発明の金属線材加熱装置は、第7の発明において、前記包囲筒体は部分的に膨出して内容積を大きくした膨出部を有しており、前記通気装置は、前記膨出部内に連通するように該膨出部の筒壁に連結されていることを特徴とする。   According to an eighth aspect of the present invention, there is provided the metal wire heating device according to the seventh aspect, wherein the surrounding cylindrical body has a bulging portion that is partially bulged to increase the internal volume, and the venting device is the bulging portion. It is connected with the cylinder wall of this bulging part so that it may communicate in a part.

上記発明によれば、包囲筒体に対する通気装置の作用箇所(連結部分など)で通気が集中して前記線方向で冷却が不均一になるのを回避することができる。該膨出部は、包囲筒体の両端よりも内部に設けることで、包囲筒体による「環境の変化を受けにくくする」という作用を損なわない。なお、本発明としては、膨出部の形成および連結は、一箇所で行ってもよく、また複数箇所で行うことも可能である。   According to the above-described invention, it is possible to prevent the air from being concentrated at the action portion (connecting portion or the like) of the ventilation device with respect to the surrounding cylindrical body and cooling to be non-uniform in the linear direction. By providing the bulging portion inside the both ends of the enclosing cylinder, the effect of “being less susceptible to environmental changes” by the enclosing cylinder is not impaired. In the present invention, the formation and connection of the bulging portion may be performed at one place, or may be performed at a plurality of places.

第9の発明の金属線材加熱装置は、第1〜第8の発明において、前記通電装置は、直流通電装置であって、少なくとも定常時に電流制御によって前記金属線材の通電加熱を行うものであることを特徴とする。   According to a ninth aspect of the present invention, there is provided the metal wire heating device according to any one of the first to eighth aspects, wherein the energization device is a direct current energization device and performs energization heating of the metal wire by current control at least in a steady state. It is characterized by.

上記発明によれば、交流電源により発生する加熱時の金属線材の微小な振動を回避することができる。該振動は、熱処理のむらなどを生じさせるものであり好ましくない。さらには、上記発明では、通電加熱を行う金属線材の個体差による加熱の差異を小さくし、また、通電加熱による昇温によって抵抗値が変化する際にも安定して金属線材を加熱することができる。   According to the said invention, the minute vibration of the metal wire at the time of the heating which generate | occur | produces with AC power supply can be avoided. The vibration is not preferable because it causes unevenness of heat treatment. Furthermore, in the said invention, the difference of the heating by the individual difference of the metal wire which performs an electrical heating is made small, and also when a resistance value changes with the temperature rising by an electrical heating, a metal wire can be heated stably. it can.

なお、本発明で処理の対象となる金属線材の材質については本発明では特に限定されるものではなく、熱処理によって所望の特性を得るものであればよく、必ずしも高強度化を意図するものでなくてもよい。また、金属線材の線径も本発明としては特に限定されるものではないが、本発明の効果が顕著に得られるものとしては、1.0mm以下の線径のものが好適である。
また、本発明で加熱処理をした金属線材の用途は、本発明としては特に限定されるものではなく、例えば、IC検査プローブピンや基板打ち抜きパンチ、ドットピン、歯科用機材などに用いることができる。
The material of the metal wire to be processed in the present invention is not particularly limited in the present invention, and any material that obtains desired characteristics by heat treatment is not necessarily intended to increase the strength. May be. Further, the wire diameter of the metal wire is not particularly limited in the present invention, but a wire having a wire diameter of 1.0 mm or less is preferable as the effect of the present invention can be remarkably obtained.
The use of the metal wire heat-treated in the present invention is not particularly limited as the present invention, and can be used for, for example, IC inspection probe pins, substrate punches, dot pins, dental equipment, etc. .

すなわち本発明によれば、金属線材を線送りにより間欠的に移送する線材移送装置と、前記金属線材に対し離接可能であって前記間欠移送の停止時に前記金属線材の線方向において距離を隔てて該金属線材に接触可能な対の電極と、該電極間に通電する通電装置とを備えるので、電極と金属線材とを確実に接触させて安定した通電加熱をおこなうことができ、効率的に線方向に均等な熱処理を連続して行うことができる。この結果、高硬度などの特性が線方向においてばらつきなく良好である金属線材を得ることができる。   In other words, according to the present invention, a wire rod transfer device that intermittently transfers a metal wire rod by wire feed, and a distance in the wire direction of the metal wire rod that is separable from the metal wire rod and is stopped when the intermittent transfer is stopped. The pair of electrodes that can come into contact with the metal wire and an energizing device that energizes between the electrodes are provided, so that the electrode and the metal wire can be reliably brought into contact with each other for stable energization and heating. A uniform heat treatment can be continuously performed in the line direction. As a result, it is possible to obtain a metal wire having excellent characteristics such as high hardness without variation in the line direction.

以下に、本発明の一実施形態を図1〜図5に基づいて説明する。
金属線材1をコイル状に巻いて送り出す送り出しロール2aと送り出しロール2aから線状に送り出された金属線材1を巻き取る巻き取りロール2bとが用意され、該巻き取りロール2bには、該巻き取りロール2bを巻き取り方向に間欠的に回転駆動するモータなどの巻き取り装置3が連結されている。上記送り出しロール2a、巻き取りロール2b、巻き取り装置3によって、金属線材を線送りにより間欠的に移送する線材移送装置が構成されている。
Below, one Embodiment of this invention is described based on FIGS.
A winding roll 2a for winding the metal wire 1 in a coil shape and a winding roll 2b for winding the metal wire 1 fed in a linear shape from the feeding roll 2a are prepared, and the winding roll 2b includes the winding roll 2b. A winding device 3 such as a motor that intermittently rotates the roll 2b in the winding direction is connected. The delivery roll 2a, the take-up roll 2b, and the take-up device 3 constitute a wire rod transfer device that intermittently transfers a metal wire rod by wire feed.

送り出しロール2aと巻き取りロール2b間で、金属線材1が直線状になる領域では、金属線材1が伸びている線方向に距離を隔てて該金属線材1に接触可能な電極10、20を備えている。これら電極10、20は、それぞれ金属線材1を挟む電極分割材10a、10bと電極分割材20a、20bとに分割されて、図示しないアクチュエータによって前記線方向に沿って移動できるように設置されている。これらの電極分割材10a、10b、20a、20bは、対面側が平面に形成され、反面側は線方向内側が対面側に傾斜したテーパ面によりくさび形状に形成されている。これらの電極分割材10a、10bと電極分割材20a、20bの外側には、それぞれ押さえ部11a、11b、21a、21bが前記電極分割材10a、10b、20a、20bのテーパ面の傾斜方向と同様の方向に沿って配置されている。なお、上記電極分割材10a、10bまた電極分割材20a、20b間には、側面などにおいて各電極分割材を互いに離反させるように付勢力を与えるスプリング12、22が介設されている。   In the region where the metal wire 1 is linear between the feed roll 2a and the take-up roll 2b, electrodes 10 and 20 are provided that can contact the metal wire 1 at a distance in the line direction in which the metal wire 1 extends. ing. These electrodes 10 and 20 are each divided into electrode dividing members 10a and 10b and electrode dividing members 20a and 20b sandwiching the metal wire 1, and are installed so as to be movable along the linear direction by an actuator (not shown). . These electrode division members 10a, 10b, 20a, and 20b are formed in a wedge shape by a taper surface that is formed in a flat surface on the opposite side and on the opposite side is inclined in the linear direction toward the opposite side. On the outer sides of the electrode dividing members 10a and 10b and the electrode dividing members 20a and 20b, the holding portions 11a, 11b, 21a and 21b are respectively the same as the inclination direction of the tapered surfaces of the electrode dividing members 10a, 10b, 20a and 20b. It is arranged along the direction. In addition, springs 12 and 22 are provided between the electrode dividing members 10a and 10b and the electrode dividing members 20a and 20b so as to apply urging forces so as to separate the electrode dividing members from each other on the side surfaces.

上記構成において、電極10、20は、線方向内側に移動させると、押さえ部10a、10b、20a、20bによるくさび作用により、互いの電極分割材10a、10bまた電極分割材20a、20bが前記スプリング12、22の付勢力に抗して接近し、遂には両者間に配置する金属線材1に圧接される。一方、電極10、20を線方向外側に移動させると電極に対するくさび作用が失われ、金属線材1に対する圧接が解消され、外側への離反が可能になる。この場合、電極分割材10a、10b間また電極分割材20a、20b間にスプリングを介設したことで、各電極分割材が容易に離反する。また、離反を容易にするために、ガイドなどを設けて各電極分割材が線方向外側へ移動するに伴って互いに離反するようにすることもできる。なお、本発明としてはこれらスプリングやガイドを有しないものであってもよい。   In the above-described configuration, when the electrodes 10 and 20 are moved inward in the line direction, the electrode dividing members 10a and 10b or the electrode dividing members 20a and 20b are moved by the wedge action of the holding portions 10a, 10b, 20a, and 20b. It approaches against the urging force of 12, 22 and finally comes into pressure contact with the metal wire 1 disposed between them. On the other hand, when the electrodes 10 and 20 are moved outward in the line direction, the wedge action on the electrodes is lost, the press contact with the metal wire 1 is eliminated, and the separation to the outside becomes possible. In this case, since the spring is interposed between the electrode dividing members 10a and 10b and between the electrode dividing members 20a and 20b, the electrode dividing members are easily separated. In order to facilitate separation, a guide or the like may be provided so that the electrode dividing members move away from each other as they move outward in the line direction. In the present invention, these springs and guides may not be provided.

また、上記電極10、20には、それぞれブリッジ整流回路4b、スイッチ4cを介してAC電源4aが電気的に接続されており、これらAC電源4aとブリッジ整流回路4bとスイッチ4cとによって直流の通電装置が構成されている。
また、電極10、20間には、前記線方向に沿って前記金属線材1を挿通させる細径の石英管5が包囲筒体として配置されている。該石英管5は、軸方向中央部に内部空間を増大させた膨出部5aがほぼ球状に設けられており、該膨出部5aに排気管6bが接続されている。該排気管6bにはファン6aが介設されており、排気管6bの他端側は適所において大気開放されている。上記ファン6aと排気管6bとによって通気装置が構成されている。
Further, an AC power supply 4a is electrically connected to the electrodes 10 and 20 via a bridge rectification circuit 4b and a switch 4c, respectively, and a direct current is supplied by the AC power supply 4a, the bridge rectification circuit 4b and the switch 4c. The device is configured.
Between the electrodes 10 and 20, a thin quartz tube 5 through which the metal wire 1 is inserted along the line direction is disposed as an enclosing cylinder. The quartz tube 5 is provided with a bulged portion 5a having an increased internal space in an axially central portion in a substantially spherical shape, and an exhaust pipe 6b is connected to the bulged portion 5a. A fan 6a is interposed in the exhaust pipe 6b, and the other end side of the exhaust pipe 6b is open to the atmosphere at an appropriate place. The fan 6a and the exhaust pipe 6b constitute a ventilation device.

また、上記押さえ部のうち、押さえ部11a、11bは、電極10とともに前記線方向に沿って移動可能になっている。さらに、押さえ部11a、11bには、引張りライン7b、張力伝達断続部7cを介して自重を利用したウェイト7aが接続可能になっている。上記ウェイト7a、引張りライン7b、張力伝達断続部7cによって線材張力付与装置が構成されている。   Of the pressing parts, the pressing parts 11 a and 11 b are movable together with the electrode 10 along the linear direction. Furthermore, a weight 7a using its own weight can be connected to the holding parts 11a and 11b via a tension line 7b and a tension transmission interrupting part 7c. The weight 7a, the tension line 7b, and the tension transmission interrupting portion 7c constitute a wire tension applying device.

上記によって構成される金属線材加熱装置の動作について図2〜図5に基づいて説明する。
先ず、電極10、20を押さえ部11a、11b内および押さえ部21a、21b内で線方向外側に退避させておき、張力伝達断続部7cでは、伝達を断にしておく。
適宜組成、適宜線径の金属線材1を用意し、送り側ロール2aにコイル状に巻いてその先端側を巻き取り側ロール2bに巻き取り可能に連結しておく。この際に、送り側ロール2aから引き出された金属線材1は、上記石英管5内に挿通して両端側を電極分割材10a、10b間および電極分割材20a、20b間に直線状に位置させて他端側が上記のように巻き取り側ロール2bに連結しておく。
The operation of the metal wire heating device configured as described above will be described with reference to FIGS.
First, the electrodes 10 and 20 are retracted to the outside in the linear direction in the holding parts 11a and 11b and the holding parts 21a and 21b, and transmission is cut off in the tension transmission interrupting part 7c.
A metal wire 1 having an appropriate composition and an appropriate wire diameter is prepared, wound around a feeding roll 2a in a coil shape, and its leading end is connected to a winding roll 2b so that it can be wound. At this time, the metal wire 1 drawn out from the feed-side roll 2a is inserted into the quartz tube 5 so that both ends are linearly positioned between the electrode dividing members 10a and 10b and between the electrode dividing members 20a and 20b. The other end is connected to the take-up roll 2b as described above.

上記金属線材1を配置した後、巻き取り装置3によって熱処理をする部分が電極10、20間に位置するように送り出しロール2aから金属線材1を線方向に移動させ停止しておく(ステップs1)。
次いで、電極10、20を、図示しないアクチュエータによって押さえ部11a、11b内および押さえ部21a、21b内で線方向内側に移動させて金属線材1を両側でチャックをする(図2(a)、ステップs2)。この際の挙動は、図4(a)に詳細に示すように、電極分割材10a、10bまたは電極分割材20a、20bを図示しないアクチュエータによって線方向内側に移動させると、押さえ部11a、11bまたは押さえ部21a、21bの傾斜した内面に電極分割材の外面のテーパー面が押し当たり、その傾斜に従って電極分割材が次第に内側に押される。これにより電極分割材10a、10b同士また電極分割材20a、20b同士が次第に接近し、遂には電極分割材10a、10b同士また電極分割材20a、20b同士が金属線材1を挟んで圧接され、金属線材1を挟持するようにチャック(保持)する。
After arranging the metal wire 1, the metal wire 1 is moved in the linear direction from the feed roll 2 a and stopped so that the portion to be heat-treated by the winding device 3 is located between the electrodes 10 and 20 (step s 1). .
Next, the electrodes 10 and 20 are moved inward in the linear direction within the holding portions 11a and 11b and within the holding portions 21a and 21b by an actuator (not shown) to chuck the metal wire 1 on both sides (FIG. 2 (a), step) s2). As shown in detail in FIG. 4A, when the electrode dividing members 10a and 10b or the electrode dividing members 20a and 20b are moved inward in the line direction by an actuator (not shown), the behavior at this time is as follows. The tapered surface of the outer surface of the electrode dividing member presses against the inclined inner surfaces of the holding portions 21a and 21b, and the electrode dividing member is gradually pushed inward according to the inclination. As a result, the electrode dividing materials 10a and 10b and the electrode dividing materials 20a and 20b gradually approach each other, and finally the electrode dividing materials 10a and 10b and the electrode dividing materials 20a and 20b are pressed against each other with the metal wire 1 sandwiched between them. The wire 1 is chucked (held) so as to sandwich it.

次いで、張力伝達断続部7cをつないでウェイト7aの自重を引張りライン7bを通して押さえ部11a、11bに加える(図2(b)、ステップs3)。すると、押さえ部21a、21bは、図4(b)に詳細を示すように、金属線材1に対し線方向後方に向けた張力を付与する。   Next, the tension transmission interrupting portion 7c is connected, and the weight of the weight 7a is applied to the holding portions 11a and 11b through the pulling line 7b (FIG. 2 (b), step s3). Then, the holding | suppressing parts 21a and 21b give the tension | tensile_strength toward the linear direction back with respect to the metal wire 1, as shown in detail in FIG.4 (b).

上記のようにして張力を付与した状態でスイッチ4cを閉にして通電を開始する(図2(c)、ステップs4)。すると交流電源4aからの交流電流は、ブリッジ整流回路4bによって整流され、直流電流が電極10、20を介して金属線材1に流れ、その抵抗熱によって金属線材1が通電加熱される。この際には、定常時には、金属線材1を流れる電流が所定の電流値になるように電流制御を行って所定時間、所定温度の加熱を行う。この際に、金属線材1は、昇温によって通常は線膨張するが、上記のように線材張力付与装置で張力が付与されているので、線膨張に伴って押さえ部11a、11bが電極10とともに線方向外側に移動し、金属線材1の直線性を維持する。   With the tension applied as described above, the switch 4c is closed to start energization (FIG. 2 (c), step s4). Then, the alternating current from the alternating current power supply 4a is rectified by the bridge rectification circuit 4b, the direct current flows to the metal wire 1 through the electrodes 10 and 20, and the metal wire 1 is energized and heated by the resistance heat. At this time, during steady operation, current control is performed so that the current flowing through the metal wire 1 becomes a predetermined current value, and heating at a predetermined temperature is performed for a predetermined time. At this time, the metal wire 1 normally linearly expands due to the temperature rise, but since the tension is applied by the wire tension applying device as described above, the holding portions 11a and 11b together with the electrode 10 are accompanied by the linear expansion. It moves to the outside in the line direction and maintains the linearity of the metal wire 1.

その後、スイッチ4cを開にして通電を停止し、ファン6aによって排気管6bを通して石英管5内の強制的な排気を行う(図2(d)、ステップs5)。
この結果、石英管5内の高温の空気が膨出部5aから排気管6bを通して排気され、石英管5の周囲の常温の空気が石英管5の内部への引き込まれ、高温になっている金属線材1を効率的かつ均等に冷却する。この際に、膨出部5aでは、両側から流れ込む空気の流れが大容積によって緩和されるので、膨出部5a内の金属線材1の一部のみが急速に冷却されるのを防止する。金属線材1の冷却を所定時間行うことにより熱処理を終了する。なお、冷却処理の全時間で、上記の強制通気を行ってもよく、冷却の途中で強制通気を終了することも可能である。また、上記冷却に際しても線材張力付与装置によって金属線材1に張力を付与したままにしておくのが望ましい。冷却に際しては通常は金属線材の降温によって金属線材1は熱収縮するが、張力伝達断続部7cをつないだままにして張力付与を維持しておくことで押さえ部11a、11bが電極10とともに線方向内側に移動しながら金属線材1が真直に収縮し、金属線材1の曲がりが防止されて直線性が維持される。
Thereafter, the switch 4c is opened to stop energization, and the fan 6a forcibly exhausts the quartz tube 5 through the exhaust tube 6b (FIG. 2 (d), step s5).
As a result, high-temperature air in the quartz tube 5 is exhausted from the bulging portion 5a through the exhaust pipe 6b, and normal-temperature air around the quartz tube 5 is drawn into the quartz tube 5 and becomes a high-temperature metal. The wire 1 is cooled efficiently and evenly. At this time, in the bulging portion 5a, the flow of air flowing from both sides is relieved by the large volume, so that only a part of the metal wire 1 in the bulging portion 5a is prevented from being rapidly cooled. The heat treatment is completed by cooling the metal wire 1 for a predetermined time. Note that the above-described forced ventilation may be performed during the entire cooling process, or the forced ventilation may be terminated during the cooling. In addition, it is desirable to keep the tension applied to the metal wire 1 by the wire tension applying device during the cooling. At the time of cooling, the metal wire 1 is usually thermally contracted due to the temperature drop of the metal wire, but the holding portions 11 a and 11 b are linearly moved together with the electrode 10 by keeping the tension transmission interrupted portion 7 c connected and maintaining tension. While moving inward, the metal wire 1 contracts straight, the bending of the metal wire 1 is prevented, and the linearity is maintained.

なお上記熱処理によって、金属線材1は図5に示すように、電極10、20間で、電極の近傍を除いて熱処理完了範囲1aが得られる。また、電極で挟まれた範囲は殆ど昇温がなされず、熱処理未了範囲1cとなる。また電極の近傍は、電極に近くて電極に熱を奪われるため昇温が十分になされず熱処理不完全範囲1bとなる(図5(a))。   By the heat treatment, as shown in FIG. 5, the heat treatment completion range 1 a is obtained between the electrodes 10 and 20 except for the vicinity of the electrodes. In addition, the range between the electrodes is hardly heated, and becomes a heat treatment incomplete range 1c. Further, the vicinity of the electrode is close to the electrode and heat is taken away by the electrode, so that the temperature rise is not sufficient and the heat treatment incomplete range 1b is obtained (FIG. 5A).

上記熱処理後は、張力伝達断続部7cの伝達を断にし、図示しないアクチュエータによって電極10、20を押さえ部11a、11b内および押さえ部21a、21b内で線方向外側に移動させる。これにより電極10、20のくさび作用が失われ、電極分割材10a、10b同士また電極分割材20a、20b同士が、スプリング12、22の付勢力によって離反し、チャックが解放される(図5(b)、ステップs6)。   After the heat treatment, the transmission of the tension transmission intermittent portion 7c is cut off, and the electrodes 10 and 20 are moved to the outside in the linear direction within the holding portions 11a and 11b and within the holding portions 21a and 21b by an actuator (not shown). As a result, the wedge action of the electrodes 10 and 20 is lost, the electrode dividing members 10a and 10b and the electrode dividing members 20a and 20b are separated by the urging force of the springs 12 and 22, and the chuck is released (FIG. 5 ( b), step s6).

この状態で、処理を継続するか否かの判定を行い(ステップs7)、継続の場合、巻き取り装置3を動作させて金属線材1を巻き取りロール2b側に所定の線送り量だけ移送する(図2(e)、ステップs8)。この際の線送り量は、図5(c)、(d)に示すように、線送りによって、上記熱処理不完全範囲1bが、下流側の電極にあたる電極20の接触位置から上記熱処理不完全範囲1bと同程度の範囲を残して上流側に位置するように設定する。これにより上記熱処理不完全範囲1bと熱処理未了範囲1cと、それよりも上流側の未処理部分を含めて次の熱処理の対象とすることができる。   In this state, it is determined whether or not to continue the process (step s7). When the process is continued, the winding device 3 is operated to transfer the metal wire 1 to the winding roll 2b by a predetermined line feed amount. (FIG. 2 (e), step s8). As shown in FIGS. 5C and 5D, the line feed amount at this time is such that the heat treatment incomplete range 1b is changed from the contact position of the electrode 20 corresponding to the downstream electrode by the wire feed. It is set so that it is positioned upstream, leaving a range similar to 1b. As a result, the heat treatment incomplete range 1b, the heat treatment incomplete range 1c, and the untreated portion upstream of the heat treatment can be included in the next heat treatment.

すなわち、上記行程と同様に金属線材の移送後、電極による金属線材のチャック、張力の付与、通電、冷却を行って熱処理を行う。この熱処理においても電極で挟まれた範囲と電極の近傍は、熱処理が完了しないが、上記した前回の熱処理における熱処理不完全範囲1bと熱処理未了範囲1cとは、それよりも内側にあって良好な熱処理が行われる。
上記行程を繰り返すことで、熱処理が不完全な部分を発生させることなく金属線材のほぼ全長に亘って均等に熱処理を行うことができる。
なお、上記各行程における線材移送装置の移送および停止、電極の線方向の移動、線材張力付与装置の断続、通電装置の通電、通気装置の稼働および停止は、制御部において集中的に制御することができる。該制御部は、例えばCPUとこれを動作させるプログラムとによって構成することができる。
That is, similarly to the above process, after the metal wire is transferred, the heat treatment is performed by chucking the metal wire with the electrode, applying tension, energizing, and cooling. In this heat treatment as well, the heat treatment is not completed in the area sandwiched between the electrodes and the vicinity of the electrode, but the heat treatment incomplete range 1b and the heat treatment incomplete range 1c in the previous heat treatment are on the inner side and good. Heat treatment is performed.
By repeating the above process, the heat treatment can be performed uniformly over almost the entire length of the metal wire without generating an incomplete part of the heat treatment.
In addition, in the above-mentioned processes, the transfer and stop of the wire rod transfer device, the movement of the electrodes in the linear direction, the intermittent connection of the wire rod tension applying device, the energization of the energizer, and the operation and stop of the aeration device should be centrally controlled by the control unit. Can do. The control unit can be configured by, for example, a CPU and a program for operating the CPU.

上記によって加熱処理された金属線材は、長手方向においてむらなく熱処理がなされ、特性のばらつきがなく均等な特性(高硬度など)を有しており、熱処理も効率よくなされている。
以上、本発明について上記実施形態に基づいて説明を行ったが、本発明は上記実施形態の内容に限定をされるものではなく、本発明の範囲を逸脱しない範囲で適宜の変更が可能である。
The metal wire heat-treated as described above is uniformly heat-treated in the longitudinal direction, has uniform characteristics (such as high hardness) without variation in characteristics, and is efficiently heat-treated.
As described above, the present invention has been described based on the above embodiment, but the present invention is not limited to the content of the above embodiment, and appropriate modifications can be made without departing from the scope of the present invention. .

上記実施形態における金属線材加熱装置を用いて、質量比で、Cr38%、Al4%、残部Niと不可避不純物からなる組成からなり、線径0.1mmの金属線材について、480mmの間隔で上記電極によりチャック可能にし、金属線材を間欠移送しつつ、停止時に加熱、冷却処理を行った。
加熱処理では、金属線材が560〜580℃で150秒間加熱されるように電流制御しつつ通電加熱を行った。通電後、上記した通気装置によって強制的に通気を行い、強制通気を継続して100秒の冷却を行った。
この熱処理を施した金属線材の機械的特性を測定し、下記表1に示した。表1に示されるように、電極チャック部と、電極と石英管の間に位置した部位と、石英管が位置した部位の金属線材の硬度を測定した。電極と石英管の間に位置した部位は二度加熱を受け、その他は一度加熱を受けているが、それぞれほぼ同等の優れた機械特性を有しており、線方向の特性のばらつきは非常に小さいものであった。また、目視検査の結果、金属線材の直線性も優れていた。
Using the metal wire heating device in the above embodiment, the metal wire composition having a mass ratio of Cr 38%, Al 4%, the balance Ni and inevitable impurities, with a wire diameter of 0.1 mm, with the electrode at intervals of 480 mm. Heating and cooling treatment were performed at the time of stopping while enabling the chucking and intermittently transferring the metal wire.
In the heat treatment, energization heating was performed while controlling the current so that the metal wire was heated at 560 to 580 ° C. for 150 seconds. After energization, air was forcibly ventilated by the aeration device described above, and forced air was continued to cool for 100 seconds.
The mechanical properties of the metal wire subjected to the heat treatment were measured and are shown in Table 1 below. As shown in Table 1, the hardness of the electrode chuck part, the part located between the electrode and the quartz tube, and the metal wire at the part where the quartz tube was located were measured. The part located between the electrode and the quartz tube is heated twice, and the others are heated once, but each has almost the same excellent mechanical characteristics, and the variation in the characteristics in the linear direction is very It was a small one. As a result of visual inspection, the linearity of the metal wire was also excellent.

Figure 0005108283
Figure 0005108283

本発明の一実施形態の金属線材加熱装置を示す図である。It is a figure which shows the metal wire heating apparatus of one Embodiment of this invention. 同じく、熱処理工程を示すフロー図である。Similarly, it is a flowchart which shows a heat treatment process. 同じく、熱処理工程を示すフロー図である。Similarly, it is a flowchart which shows a heat treatment process. 同じく、処理時の工程の一部を詳細に示す図である。Similarly, it is a figure which shows a part of process at the time of a process in detail. 同じく、処理時の工程の一部を詳細に示す図である。Similarly, it is a figure which shows a part of process at the time of a process in detail.

符号の説明Explanation of symbols

1 金属線材
3 巻き取り装置
4a 交流電源
4b ブリッジ整流回路
5 石英管
5a 膨出部
6 ファン
6a 排気管
7a ウェイト
7b 引張りライン
7c 張力伝達断続部
10 電極
10a 電極分割材
10b 電極分割材
11a 押さえ部
11b 押さえ部
12 スプリング
20 電極
20a 電極分割材
20b 電極分割材
21a 押さえ部
21b 押さえ部
22 スプリング
DESCRIPTION OF SYMBOLS 1 Metal wire material 3 Winding device 4a AC power supply 4b Bridge rectifier circuit 5 Quartz tube 5a Expansion part 6 Fan 6a Exhaust pipe 7a Weight 7b Tension line 7c Tension transmission intermittent part 10 Electrode 10a Electrode dividing material 10b Electrode dividing material 11a Holding part 11b Holding part 12 Spring 20 Electrode 20a Electrode dividing material 20b Electrode dividing material 21a Holding part 21b Holding part 22 Spring

Claims (9)

金属線材を線送りにより間欠的に移送する線材移送装置と、前記金属線材に対し離接可能であって前記間欠移送の停止時に前記金属線材の線方向において距離を隔てて該金属線材に接触可能な対の電極と、該電極間に通電する通電装置とを備え
前記線材移送装置は、前記電極による前記金属線材への通電と該金属線材の冷却とが間欠移送の停止時間中になされるように間欠的な移送を行うものであることを特徴とする金属線材加熱装置。
A wire rod transfer device that intermittently moves a metal wire rod by wire feed, and can be separated from and contacted with the metal wire rod, and can contact the metal wire at a distance in the wire direction of the metal wire rod when the intermittent transfer is stopped. A pair of electrodes and an energization device for energizing between the electrodes ,
It is the wire transfer device, a metal, characterized in der Rukoto that the energization of the metal wire by the electrode and the cooling of the metal wire performs intermittent transport as is done during the downtime of the intermittent transport Wire heating device.
前記線材移送装置は、間欠的な移送の一動作において、前記対の電極のうち上流側の電極が接触した前記金属線材の一部分とその線方向内側近傍が、下流側の電極が接触する位置の上流側近傍に移動するように線送りするものであることを特徴とする請求項1記載の金属線材加熱装置。 In the intermittent transfer operation, the wire transfer device is configured such that a part of the metal wire contacted with the upstream electrode of the pair of electrodes and a position near the inner side in the line direction are in contact with the downstream electrode. 2. The metal wire heating device according to claim 1 , wherein the wire is fed so as to move in the vicinity of the upstream side . 金属線材を線送りにより間欠的に移送する線材移送装置と、前記金属線材に対し離接可能であって前記間欠移送の停止時に前記金属線材の線方向において距離を隔てて該金属線材に接触可能な対の電極と、該電極間に通電する通電装置とを備え、
前記線材移送装置は、間欠的な移送の一動作において、前記対の電極のうち上流側の電極が接触した前記金属線材の一部分とその線方向内側近傍が、下流側の電極が接触する位置の上流側近傍に移動するように線送りするものであることを特徴とする金属線材加熱装置。
A wire rod transfer device that intermittently moves a metal wire rod by wire feed, and can be separated from and contacted with the metal wire rod, and can contact the metal wire at a distance in the wire direction of the metal wire rod when the intermittent transfer is stopped. A pair of electrodes and an energization device for energizing between the electrodes,
In the intermittent transfer operation, the wire transfer device is configured such that a part of the metal wire contacted with the upstream electrode of the pair of electrodes and a position near the inner side in the line direction are in contact with the downstream electrode. A metal wire heating device, wherein the wire is fed so as to move in the vicinity of the upstream side.
少なくとも前記電極への通電時に、前記電極間の金属線材に張力を付与する線材張力付与装置を備えることを特徴とする請求項1〜3のいずれかに記載の金属線材加熱装置。   The metal wire heating device according to any one of claims 1 to 3, further comprising a wire tension applying device that applies tension to the metal wire between the electrodes at least during energization of the electrodes. 前記対の電極の一方または両方が前記金属線材を保持して前記線方向に沿って移動可能とされており、前記線材張力付与装置は、前記移動が可能とされた電極に移動方向に応力を加えて前記張力を付与するものであることを特徴とする請求項4記載の金属線材加熱装置。 One or both of the pair of electrodes hold the metal wire and can move along the wire direction, and the wire tension applying device applies stress to the electrode that is allowed to move in the moving direction. The metal wire heating apparatus according to claim 4, wherein the tension is applied in addition. 前記対の電極間の金属線材の周囲を囲む包囲筒体を備えることを特徴とする請求項1〜5のいずれかに記載の金属線材加熱装置。 The metal wire heating device according to any one of claims 1 to 5, further comprising an enclosing cylinder surrounding the metal wire between the pair of electrodes. 前記包囲筒体内の強制通気を行う通気装置を備えることを特徴とする請求項記載の金属線材加熱装置。 The metal wire heating device according to claim 6, further comprising a ventilation device that performs forced ventilation in the surrounding cylindrical body. 前記包囲筒体は部分的に膨出して内容積を大きくした膨出部を有しており、前記通気装置は、前記膨出部内に連通するように該膨出部の筒壁に連結されていることを特徴とする請求項7記載の金属線材加熱装置。   The surrounding cylindrical body has a bulging portion that bulges partially to increase its internal volume, and the ventilation device is connected to a cylindrical wall of the bulging portion so as to communicate with the bulging portion. The metal wire heating apparatus according to claim 7, wherein 前記通電装置は直流通電装置であって、少なくとも定常時に電流制御によって前記金属線材の通電加熱を行うものであることを特徴とする請求項1〜8のいずれかに記載の金属線材加熱装置。   The metal wire heating device according to any one of claims 1 to 8, wherein the energization device is a direct current energization device, and performs energization heating of the metal wire by current control at least in a steady state.
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