JP2014031529A

JP2014031529A - Direct resistance heating device

Info

Publication number: JP2014031529A
Application number: JP2012171082A
Authority: JP
Inventors: Tatsumi Hishikawa; 辰巳菱川; Motoyasu Machino; 元康町野; Naomichi Ito; 直道伊東
Original assignee: Toyota Motor Corp; STAR TECHNO CO Ltd
Current assignee: Toyota Motor Corp; STAR TECHNO CO Ltd
Priority date: 2012-08-01
Filing date: 2012-08-01
Publication date: 2014-02-20
Anticipated expiration: 2032-08-01
Also published as: JP5783967B2

Abstract

PROBLEM TO BE SOLVED: To provide a direct resistance heating device capable of: uniformly heat-treating a metal shaft material by uniformly press-contacting a heat dissipation block to an outer peripheral surface on each end side of the metal shaft material in an axial direction to dissipate heat; and uniformly heat-treating the metal shaft material by uniformly press-contacting the heat dissipation block to the outer peripheral surface on each end side of the metal shaft material in the axial direction to stably dissipate heat even when thermal expansion due to direct resistance heating enlarges the diameter of the metal shaft material or elongates the metal shaft material in the axial direction.SOLUTION: A direct resistance heating device can move each heat dissipation block (75 and 77) following inclination of the shaft center of a metal shaft material (5) held by a pair of electrode (7 and 9) in a direction coincident with the axis and in a direction orthogonal to the axis, and contact each contact part (75a and 77a) rockable in a horizontal direction to the outer peripheral surface of the metal shaft material (5) to dissipate heat from the metal shaft material (5) subjected to direct resistance heating.

Description

本発明は、一対の電極により挟持された金属軸材に電流を印加して抵抗加熱する直接抵抗加熱装置、詳しくは金属軸材に対して電流を印加した直後に軸線方向各端部が過度に加熱されるのを回避して金属軸材全体を均一に加熱することを可能にする放熱手段を備えた直接抵抗加熱装置に関する。 The present invention relates to a direct resistance heating device for applying resistance to a metal shaft sandwiched between a pair of electrodes for resistance heating, more specifically, each end in the axial direction is excessive immediately after applying current to the metal shaft. The present invention relates to a direct resistance heating apparatus provided with a heat radiating means that makes it possible to uniformly heat the entire metal shaft member while avoiding heating.

高強度が要求される部品を製造する際に、該部品素材である金属軸材を焼入れしたり、焼鈍したりするための加熱処理を行っている。該加熱処理を行う装置例として、例えば金属軸材の軸線方向両端部に電極をそれぞれ電気的に接続した状態で所要の電流を印加し、該金属軸材が有する固有電気抵抗により発生するジュール熱により金属軸材を所要の温度に加熱する直接抵抗加熱装置が知られている。 When manufacturing a component that requires high strength, a heat treatment is performed to quench or anneal the metal shaft material that is the component material. As an example of an apparatus for performing the heat treatment, for example, Joule heat generated by a specific electric resistance of the metal shaft member by applying a required current in a state where electrodes are electrically connected to both ends in the axial direction of the metal shaft member. A direct resistance heating device for heating a metal shaft to a required temperature is known.

該直接抵抗加熱装置にあっては、軸線方向端面が電極により挟持された金属軸材に対して電流を印加した直後においては、金属軸材の軸線方向中間部に比べて各電極が接触する軸線方向各端部が過度に加熱されるため、金属軸材全体を均一に加熱することが困難で、金属軸材の焼入れ品質や焼鈍品質が悪くなる問題を有している。 In the direct resistance heating device, immediately after the current is applied to the metal shaft member whose axial end face is sandwiched between the electrodes, the axis line with which each electrode contacts is compared with the intermediate portion in the axial direction of the metal shaft member. Since each end portion in the direction is excessively heated, it is difficult to uniformly heat the entire metal shaft material, and the quenching quality and annealing quality of the metal shaft material are deteriorated.

直接抵抗加熱装置において金属軸材の軸線方向各端部が過度に加熱されるのを防止するため、例えば特許文献１に示す冷却部材を設けた直接抵抗加熱装置が知られている。特許文献１の直接抵抗加熱装置は、成形用鋼系素材の端板部に対して冷却部材を接触させて冷却しつつ加熱処理を実行し、端板部に施された防錆層が過度な加熱により劣化するのを防止している。 In order to prevent the end portions in the axial direction of the metal shaft material from being excessively heated in the direct resistance heating device, for example, a direct resistance heating device provided with a cooling member shown in Patent Document 1 is known. The direct resistance heating device of Patent Document 1 performs heat treatment while bringing a cooling member into contact with the end plate portion of the forming steel material and cooling it, and the rust prevention layer applied to the end plate portion is excessive. Prevents deterioration due to heating.

しかし、本願が加熱対象とする金属軸材の軸線方向端部を特許文献１に示す冷却部材により冷却する場合、以下の問題点を有している。即ち、第１に、本願が対象とする金属軸材にあっては、加熱による焼入れ品質又は焼鈍品質を均一化するには、被冷却箇所の外周面全体に冷却部材を接触させて過熱を抑制する必要があるが、特許文献１に示す冷却部材は、平板形状であるため、金属軸材における軸線方向各端部側の外周面全体を均一に冷却することができない問題を有している。第２に、特許文献１の冷却部材を金属軸材に挿嵌可能なリング状に構成して金属軸材における軸線方向各端部側の冷却可能にしたとしても、金属軸材自体、直接抵抗加熱により熱膨張して大径化するため、金属軸材における軸線方向各端部側の外周面全体へ冷却部材を均一に接触させることが困難であった。第３に、金属軸材を直接抵抗加熱した際には、該金属軸材が熱膨張により軸線方向へ伸長し、金属軸材における軸線方向各端部側外周面に対する冷却部材の接触状態を保つことが困難であった。 However, when cooling the axial direction edge part of the metal shaft material which this application heats with the cooling member shown in patent documents 1, it has the following problems. That is, first, in the metal shaft material targeted by the present application, in order to make the quenching quality or annealing quality by heating uniform, the cooling member is brought into contact with the entire outer peripheral surface of the cooled portion to suppress overheating. However, since the cooling member shown in Patent Document 1 has a flat plate shape, there is a problem that the entire outer peripheral surface of each end in the axial direction of the metal shaft cannot be uniformly cooled. Secondly, even if the cooling member of Patent Document 1 is configured in a ring shape that can be inserted into the metal shaft member so as to be cooled on each end side in the axial direction of the metal shaft member, Since the diameter of the metal shaft is increased by heating, it is difficult to make the cooling member uniformly contact the entire outer peripheral surface of each end of the metal shaft in the axial direction. Third, when the metal shaft material is directly resistance-heated, the metal shaft material is expanded in the axial direction due to thermal expansion, and the contact state of the cooling member with respect to the outer peripheral surface of each end side in the axial direction of the metal shaft material is maintained. It was difficult.

特開２００９−２２９９５号公報JP 2009-2295 A

解決しようとする問題点は、金属軸材における軸線方向各端部側の外周面全体に放熱ブロックを均一に接触させて放熱（冷却）することが困難で、金属軸材を均一な品質で加熱処理できない点にある。また、金属軸材自体、直接抵抗加熱による熱膨張により大径化したり、軸線方向へ伸長したりするため、金属軸材における軸線方向各端部側の外周面に対して放熱ブロックを均一に接触させることが困難で放熱を安定化させることができない点にある。 The problem to be solved is that it is difficult to dissipate (cool) heat by uniformly contacting the heat dissipation block with the entire outer peripheral surface of each end in the axial direction of the metal shaft, and heat the metal shaft with uniform quality. It cannot be processed. In addition, the metal shaft itself increases in diameter due to thermal expansion due to direct resistance heating, or extends in the axial direction, so the heat dissipation block contacts the outer peripheral surface of each end in the axial direction of the metal shaft evenly. It is difficult to stabilize the heat dissipation.

本発明は、軸線方向各端面に圧接する一対の電極により挟持された金属軸材に対して所要の電流を印加して金属軸材の電気的固有抵抗により発生するジュール熱により所要の温度に加熱する直接抵抗加熱装置において、一対の電極により挟持された金属軸材における軸線方向各端部側の外周面へ圧接可能にそれぞれ配置される放熱手段は、上記外周面に対してそれぞれ１／４周分に亘って当接する当接部が設けられ、互いに隣接するように付勢された一対の放熱ブロックと、各放熱ブロックを上記軸線方向へ移動可能にする第１移動手段と、上記第１移動手段を上記軸線と直交方向へ移動可能にする第２移動手段と、第２移動手段に対して各放熱ブロックを搖動可能に支持する搖動手段とを備え、一対の電極により挟持された金属軸材軸心の傾きに追従して各放熱ブロックを上記軸線と一致する方向及び軸線と直交する方向へ移動可能にすると共に水平方向に対して搖動可能にしてそれぞれの当接部を上記外周面へ当接して直接抵抗加熱される金属軸材からの放熱を可能にしたことを最も主要な特徴とする。 The present invention applies a required current to a metal shaft sandwiched between a pair of electrodes pressed against each end face in the axial direction, and heats the metal shaft to a required temperature by Joule heat generated by the electrical resistivity of the metal shaft. In the direct resistance heating apparatus, the heat dissipating means arranged to be press-contactable to the outer peripheral surface on each end side in the axial direction of the metal shaft member sandwiched by the pair of electrodes, respectively, is ¼ circumference with respect to the outer peripheral surface. A pair of heat dissipating blocks that are urged so as to be adjacent to each other, a first moving means that allows the heat dissipating blocks to move in the axial direction, and the first movement A metal shaft member sandwiched between a pair of electrodes, comprising: a second moving means for allowing the means to move in a direction orthogonal to the axis; and a swinging means for supporting each heat radiation block so as to be swingable with respect to the second moving means. Axial Each heat dissipating block can be moved in a direction coinciding with the axis and in a direction perpendicular to the axis, and can be slid in the horizontal direction so that each abutment portion abuts the outer peripheral surface directly. The most important feature is that heat can be released from the metal shaft that is heated by resistance.

本発明は、金属軸材における軸線方向各端部側の外周面に対して放熱ブロックを均一に圧接させて放熱可能にし、金属軸材を均一に加熱処理することができる。また、直接抵抗加熱による熱膨張により金属軸材が大径化したり、軸線方向へ伸長したりする場合であっても、金属軸材における軸線方向各端部側の外周面に対して放熱ブロックを均一に圧接させて安定的に放熱させて金属軸材を均一に加熱処理することを可能にすることができる。 The present invention makes it possible to dissipate heat by uniformly pressing the heat dissipating block against the outer peripheral surface of each end in the axial direction of the metal shaft, and the metal shaft can be uniformly heat-treated. In addition, even when the metal shaft is enlarged in diameter or expanded in the axial direction due to thermal expansion due to direct resistance heating, a heat dissipation block is attached to the outer peripheral surface of each end in the axial direction of the metal shaft. It is possible to uniformly heat-treat the metal shaft material by uniformly pressing and heat-dissipating.

直接抵抗加熱装置の概略を示す略体正面図である。It is an approximate body front view showing an outline of a direct resistance heating device. 放熱手段の全体斜視図である。It is a whole perspective view of a thermal radiation means. 放熱手段の分解斜視図である。It is a disassembled perspective view of a thermal radiation means. 搖動盤の搖動支持構造を示す部分断面図である。It is a fragmentary sectional view which shows the sliding support structure of a sliding board. 電極により金属軸材を挟持した状態を示す説明図である。It is explanatory drawing which shows the state which clamped the metal shaft material with the electrode. 挟持された金属軸材における軸線方向各端部に放熱ブロックを圧接した状態を示す説明図である。It is explanatory drawing which shows the state which press-contacted the thermal radiation block to each edge part of the axial direction in the clamped metal shaft. 軸線方向の各端面が軸線に対して鉛直面でない金属軸材に放熱手段を圧接させた際に形成される間隙の状態を示す説明図である。It is explanatory drawing which shows the state of the gap | interval formed when each end surface of an axial direction presses a thermal radiation means to the metal shaft material which is not a perpendicular surface with respect to an axis. 金属軸材の傾きに追従して搖動盤が軸線方向及び軸線直交方向へ移動する状態を示す説明図である。It is explanatory drawing which shows the state which follows the inclination of a metal shaft, and a sliding board moves to an axial direction and an axial orthogonal direction. 金属軸材の傾きに追従して搖動盤が搖動する状態を示す説明図である。It is explanatory drawing which shows the state which a rocking | fluctuation board rocks following the inclination of a metal shaft. 放熱ブロックが金属軸材の傾きに追従して圧接する状態を示す説明図である。It is explanatory drawing which shows the state which a thermal radiation block follows the inclination of a metal shaft, and press-contacts. 金属軸材が熱膨張により大径化した際における放熱ブロック相互の引き寄せ状態を示す説明図である。It is explanatory drawing which shows the drawing state of heat dissipation blocks when a metal shaft material is enlarged by thermal expansion. 金属軸材が熱膨張により軸線方向へ伸長した際における放熱ブロックの移動状態を示す説明図である。It is explanatory drawing which shows the movement state of the thermal radiation block at the time of a metal shaft material extending | stretching to an axial direction by thermal expansion.

一対の電極により挟持された金属軸材軸心の傾きに追従して各放熱ブロックを上記軸線と一致する方向及び軸線と直交する方向へ移動可能にすると共に水平方向に対して搖動可能にしてそれぞれの当接部を金属軸材の外周面へ当接して直接抵抗加熱される金属軸材からの放熱を可能にしたことを最適の実施形態とする。 Following the inclination of the axis of the metal shaft sandwiched between the pair of electrodes, each heat dissipating block can be moved in the direction coincident with the axis and in the direction perpendicular to the axis, and can be moved in the horizontal direction. It is an optimal embodiment that heat can be radiated from the metal shaft that is directly resistance-heated by contacting the contact portion of the metal shaft with the outer peripheral surface of the metal shaft.

以下、本発明の実施例を図に従って説明する。
図1乃至図４に示すように、直接抵抗加熱装置1は、架台３の図示する右側及び左側にて金属軸材５の軸線方向長さより長い間隔をおいて相対する一対の電極７・９が配置される。その内、図示右側に配置される他方の電極９は、架台３に固定された第２取付け台１１に対し、電気絶縁体１３を設けて取り付けられる。また、図示左側に配置される一方の電極７は、架台３に対して他方の電極９に対して近づく方向及び遠ざかる方向へ移動するように支持された第１取付け台１５に電気絶縁体１６を設けて取り付けられる。 Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 to 4, the direct resistance heating apparatus 1 includes a pair of electrodes 7, 9 that are opposed to each other on the right and left sides of the gantry 3 with a longer interval than the axial length of the metal shaft 5. Be placed. Among them, the other electrode 9 arranged on the right side in the drawing is attached to the second mounting base 11 fixed to the gantry 3 by providing an electrical insulator 13. Also, one electrode 7 disposed on the left side of the figure has an electrical insulator 16 mounted on a first mounting base 15 supported so as to move in a direction approaching and moving away from the other electrode 9 with respect to the gantry 3. Installed and attached.

上記第１取付け台１５は、架台３に固定されたシリンダ等の作動部材１７に連結され、該作動部材１７の作動に伴って移動する第１取付け台１５により一方の電極７を他方の電極９に対して近づく方向及び遠ざかる方向へ移動させる。なお、図中の符号１９は、架台３に対して軸線方向へ摺動するように支持されると共に一方の軸端部が第１取付け台１５に固定されるガイドロッドである。また、一対の電極７・９により挟持されて直接抵抗加熱される金属軸材５は、軸線方向が上記した両電極７・９の間隔より短い長さで固有電気抵抗を有している。 The first mounting base 15 is connected to an operating member 17 such as a cylinder fixed to the gantry 3, and the first mounting base 15 that moves with the operation of the operating member 17 moves one electrode 7 to the other electrode 9. The direction is moved toward and away from. Reference numeral 19 in the figure denotes a guide rod that is supported so as to slide in the axial direction with respect to the gantry 3 and that one end of the shaft is fixed to the first mounting base 15. Further, the metal shaft member 5 sandwiched between the pair of electrodes 7 and 9 and directly resistance-heated has a specific electric resistance with an axial direction shorter than the distance between the electrodes 7 and 9 described above.

上記一対の電極７・９間の架台３には、芯出し手段２１が金属軸材５の軸線方向各端部側に対応してそれぞれ設けられる。各芯出し手段２１は、上下方向へ作動するシリンダ等からなる上下作動部材２１ａと、上下作動部材２１ａの作動軸に固定され、上部が開口した側面Ｖ字形の溝で金属軸材５の軸線方向端部側を支持して芯出しする芯出しブロック２１ｂにより構成される。各芯出し手段２１は、各上下作動部材２１ａの作動によりそれぞれの芯出しブロック２１ｂが上方の芯出し位置へ移動した際に、各芯出しブロック２１ｂに移載される金属軸材５を、その軸心と電極７・９の中心を結ぶ仮想線を一致させて芯出しする。 Centering means 21 is provided on the gantry 3 between the pair of electrodes 7 and 9 so as to correspond to each end side in the axial direction of the metal shaft 5. Each centering means 21 is fixed to the vertical operating member 21a composed of a cylinder or the like that operates in the vertical direction, and the operating shaft of the vertical operating member 21a. It is constituted by a centering block 21b that supports the end side and performs centering. Each centering means 21 moves the metal shaft member 5 transferred to each centering block 21b when each centering block 21b is moved to the upper centering position by the operation of each vertical operation member 21a. Centering is performed by matching the imaginary line connecting the axis and the center of the electrodes 7 and 9.

また、上記各芯出しブロック２１ｂ間に応じた架台３には、芯出しブロック２１ｂに支持された金属軸材５に対する交差位置から架台３の前側へ下降傾斜する左右一対のシュータ２３が設けられる。該シュータ２３は、直接抵抗加熱後の金属軸材５を支持する各芯出しブロック２１ｂを下方へ移動させる際に移載される金属軸材５を架台３の前方へ排出させる。 The gantry 3 between the centering blocks 21b is provided with a pair of left and right shooters 23 that are inclined downward from the crossing position with respect to the metal shaft 5 supported by the centering block 21b to the front side of the gantry 3. The shooter 23 discharges the metal shaft 5 to be transferred to the front of the gantry 3 when the centering blocks 21b that support the metal shaft 5 after direct resistance heating are moved downward.

一対の電極７・９により挟持された金属軸材５の軸線方向各端部に応じた架台３には、上下一対の放熱手段２５・２７（各放熱部材２５・２７は、同一の構造であるため、図２乃至図４は、下方に配置される放熱部材２７のみを示して他の図示を省略する。）がそれぞれ配置される。各放熱手段２５・２７の昇降台２９には、上下方向に軸線を有した少なくとも２本（図示の例では、４本とする。）のガイドロッド３１の軸端部が固定され、各ガイドロッド３１は、架台３に対して昇降するように支持される。そして上記昇降台２９には、上下方向に軸線を有して架台３に固定されたシリンダ等の上下作動部材３３の作動軸が連結され、該上下作動部材３３の作動に伴って昇降台２９を昇降させる。 A pair of upper and lower heat dissipating means 25 and 27 (the heat dissipating members 25 and 27 have the same structure) are provided on the frame 3 corresponding to each end in the axial direction of the metal shaft member 5 sandwiched between the pair of electrodes 7 and 9. Therefore, FIGS. 2 to 4 show only the heat radiating member 27 arranged below, and other illustrations are omitted). At least two (four in the illustrated example) guide rods 31 having axis lines in the vertical direction are fixed to the lifting platform 29 of each heat radiating means 25 and 27, and each guide rod is fixed. 31 is supported so that it may raise / lower with respect to the mount frame 3. Then, an operating shaft of a vertical operating member 33 such as a cylinder having an axis line in the vertical direction and fixed to the gantry 3 is connected to the lifting base 29, and the lifting base 29 is moved along with the operation of the vertical operating member 33. Move up and down.

昇降台２９の図示する左右端部及び中央部には、金属軸材５の軸線方向と一致する方向（図示する前後方向））に軸線を有した第１移動手段の一部を構成するガイドロッド３５がそれぞれ横架され、その内の図示する左右端部のガイドロッド３５には、第１移動手段の一部を構成する可動体３７がイドロッド３５の軸線方向へそれぞれ移動するように支持される。各可動体３７間には、金属軸材５の軸線と直交する方向（図示する左右方向））に軸線を有した第２移動手段の一部を構成するガイドロッド３９が横架され、これらガイドロッド３９には、第２移動手段の一部を構成する第１及び第２取付け体４１・４３がイドロッド３９の軸線方向へ移動するように支持される。 Guide rods constituting part of the first moving means having an axis in the direction (the front-rear direction shown in the figure) coincident with the axial direction of the metal shaft 5 at the left and right end portions and the center portion of the lifting platform 29 shown in the drawing. 35 are horizontally mounted, and a movable body 37 constituting a part of the first moving means is supported by guide rods 35 at the left and right end portions shown in the figure so as to move in the axial direction of the id rod 35, respectively. . Between each movable body 37, a guide rod 39 constituting a part of the second moving means having an axis line in a direction orthogonal to the axis line of the metal shaft member 5 (the horizontal direction shown in the figure) is horizontally mounted. The rod 39 supports the first and second attachment bodies 41 and 43 constituting a part of the second moving means so as to move in the axial direction of the id rod 39.

上記第１及び第２取付け体４１・４３は、昇降台２９の前後壁面との間に応じた左右方向中間部に位置するガイドロッド３５周りにそれぞれ装着された第１移動手段の一部を構成する圧縮ばね等の第１弾性部材４５の弾性力により図示する前後方向中間部に位置するように付勢される。また、第１及び第２取付け体４１・４３は、各可動体３７との間に応じたガイドロッド３９周りにそれぞれ装着された第２移動手段の一部を構成する圧縮ばね等の第２弾性部材４７の弾性力により図示する左右方向の中間部に位置するように付勢される。 The first and second attachment bodies 41 and 43 constitute a part of the first moving means respectively mounted around the guide rod 35 located in the middle portion in the left-right direction according to the space between the front and rear wall surfaces of the lifting platform 29. The first elastic member 45 such as a compression spring is biased so as to be positioned at the intermediate portion in the front-rear direction shown in the figure. Further, the first and second attachment bodies 41 and 43 are second elastic members such as compression springs constituting a part of second moving means respectively mounted around the guide rods 39 corresponding to the respective movable bodies 37. The member 47 is biased by the elastic force of the member 47 so as to be positioned at the intermediate portion in the left-right direction shown in the figure.

各第１及び第２取付け体４１・４３には、図示する上下方向に軸線を有し、図示する前後方向へ所要の間隔をおいた２本の支持軸４９・５１の基端部がそれぞれ固定され、各支持軸４９・５１の先端部には、搖動手段の一部を構成する第１及び第２搖動盤５３・５５が軸線方向に対して搖動可能で、かつ抜け止めされた状態で遊嵌される。各第１及び第２搖動盤５３・５５は、第１及び第２取付け体４１・４３との間に位置する各支持軸３１周りに装着される搖動手段の一部を構成する圧縮ばね等の第３及び第４弾性部材５７・５９の弾性力により上方へ付勢され、各第１及び第２搖動盤５３・５５の上面を水平状態にさせる。 The first and second mounting bodies 41 and 43 are fixed to the base end portions of two support shafts 49 and 51 having an axis line in the vertical direction shown in the figure and spaced apart in the front-rear direction shown in the figure. The first and second rocking plates 53 and 55 constituting a part of the rocking means can be rocked in the axial direction at the front end portions of the support shafts 49 and 51, and are loosely retained. Fitted. Each of the first and second sliding plates 53 and 55 is a compression spring or the like that constitutes a part of the swinging means mounted around each support shaft 31 positioned between the first and second mounting bodies 41 and 43. It is urged upward by the elastic force of the third and fourth elastic members 57 and 59 to make the upper surfaces of the first and second sliding plates 53 and 55 horizontal.

各第１及び第２搖動盤５３・５５は、各支持軸４９・５１の先端部に対し、以下のように構成されて軸線方向に対して搖動可能で、かつ抜け止めされた状態で取り付けられる。 The first and second sliding plates 53 and 55 are attached to the tip portions of the support shafts 49 and 51 in the following manner, configured to be swingable in the axial direction, and prevented from coming off. .

第１及び第２搖動盤５３・５５における各支持軸４９・５１先端部の支持箇所には、支持軸４９・５１の外径より大きい内径の挿通孔５３ａ・５５ａに連通する凹所５３ｂ・５５ｂがそれぞれ形成され、各凹所５３ｂ・５５ｂの底側内周面には、半球状の摺動面５３ｃ・５５ｃが形成される。 Recesses 53b and 55b communicating with the insertion holes 53a and 55a having an inner diameter larger than the outer diameter of the support shafts 49 and 51 are supported at the support portions of the support shafts 49 and 51 in the first and second sliding plates 53 and 55, respectively. Are formed, and hemispherical sliding surfaces 53c and 55c are formed on the inner peripheral surfaces of the bottoms of the recesses 53b and 55b, respectively.

上記各凹所５３ｂ・５５ｂ内に位置する各支持軸４９・５１の先端部には、上記摺動面５３ｃ・５５ｃに相対する半球状の摺接面６５ａ・６７ａが形成され、第１及び第２搖動盤５３・５５に対して支持軸４９・５１を抜け止めする搖動手段の一部を構成する駒部材６５・６７がねじ６９・７１により固定される。 Hemispherical slidable contact surfaces 65a and 67a opposite to the sliding surfaces 53c and 55c are formed at the tips of the support shafts 49 and 51 located in the recesses 53b and 55b, respectively. Two piece members 65 and 67 constituting a part of the swinging means for preventing the support shafts 49 and 51 from coming off from the two swinging plates 53 and 55 are fixed by screws 69 and 71.

各第１及び第２搖動盤５３・５５は、第１及び第２取付け体４１・４３が上記第２弾性部材４７の弾性力により互いに隣接するように付勢されることにより図示する左右方向中央部にて互いに隣接し合っている。 The first and second sliding plates 53 and 55 are respectively centered in the left-right direction illustrated by the first and second mounting bodies 41 and 43 being urged so as to be adjacent to each other by the elastic force of the second elastic member 47. Are adjacent to each other.

上記第１搖動盤５３の側面には、図示する左右方向に軸線を有した引寄せ手段としての引寄せシリンダ７３が固定され、該引寄せシリンダ７３の作動軸７３ａは、第１及搖動盤５３に形成された貫通孔５３ｄを挿通して他方の第２搖動盤５５に固定される。第２搖動盤５５は、引寄せシリンダ７３の作動により第１搖動盤５３側へ引き寄せられる。 A pulling cylinder 73 as a pulling means having an axis in the left-right direction shown in the drawing is fixed to the side surface of the first swinging plate 53, and the operating shaft 73 a of the pulling cylinder 73 is connected to the first sliding plate 53. And is fixed to the other second sliding plate 55 through the through-hole 53d formed in the first hole. The second sliding plate 55 is drawn toward the first sliding plate 53 side by the operation of the drawing cylinder 73.

各第１及び第２搖動盤５３・５５の上面には、図示左右方向が長尺状の放熱ブロック７５・７７が図示左右方向へ一直線状になるように起立した状態で固定される。各放熱ブロック７５・７７は、熱伝導率が高い銅または銅合金等の金属材からなり、互いに隣接する上角部には、金属軸材５の外径に一致する１／４周分の円弧面を有した当接部７５ａ・７７ａが形成される。なお、図中の符号７９・８１は、各第１及び第２搖動盤５３・５５の上面と各放熱ブロック７５・７７の底面の間に設けられる電気絶縁体７９・８１である。 On the upper surface of each of the first and second sliding boards 53 and 55, heat radiation blocks 75 and 77 having an elongated shape in the horizontal direction in the figure are fixed in a standing state so as to be straight in the horizontal direction in the figure. Each of the heat dissipation blocks 75 and 77 is made of a metal material such as copper or a copper alloy having a high thermal conductivity. Abutting portions 75a and 77a having surfaces are formed. In addition, the code | symbol 79 * 81 in a figure is the electrical insulators 79 * 81 provided between the upper surface of each 1st and 2nd sliding board 53 * 55, and the bottom face of each thermal radiation block 75 * 77.

次に、上記のように構成された直接抵抗加熱装置１による金属軸材５の加熱処理の概略を説明すると、産業ロボットやパーツフィーダ等のワーク供給装置（図示せず）に保持された金属軸材５を、上下作動部材２１ａの作動により芯出し位置へ上昇した芯出しブロック２１ｂへ移載する。このとき、芯出しブロック２１ｂに移載された金属軸材５は、その軸心が左右一対の電極７・９の中心に一致される。 Next, the outline of the heat treatment of the metal shaft material 5 by the direct resistance heating device 1 configured as described above will be described. The metal shaft held by a workpiece supply device (not shown) such as an industrial robot or a parts feeder. The material 5 is transferred to the centering block 21b raised to the centering position by the operation of the vertical operation member 21a. At this time, the axis of the metal shaft 5 transferred to the centering block 21b is aligned with the center of the pair of left and right electrodes 7 and 9.

上記状態にて作動部材１７を作動して一方の電極７を芯出しされた金属軸材５における軸線方向の一方端面に向かって移動して当接させた後、一方端面に当接する電極７により金属軸材５を図示する右方へ移動して他方端面に他方の電極９を当接させる。その後、作動部材１７の作動を継続して金属軸材５を、軸線方向両端面に圧接する電極７・９により挟持させる。（図５参照） In the above-described state, the operating member 17 is operated to move one electrode 7 toward the one end surface in the axial direction of the centered metal shaft member 5, and then contact the one end surface by the electrode 7 that contacts the one end surface. The metal shaft member 5 is moved rightward in the drawing, and the other electrode 9 is brought into contact with the other end surface. Thereafter, the operation of the actuating member 17 is continued and the metal shaft member 5 is clamped by the electrodes 7 and 9 that are in pressure contact with both end faces in the axial direction. (See Figure 5)

上記動作後、各上下作動部材３３を作動してそれぞれの放熱手段２５・２７を互いに近づく方向へ移動し、芯出しされた金属軸材５における軸線方向各端部の外周面に対して放熱ブロック７５・７７の当接部７５ａ・７７ａを圧接させる。このとき、金属軸材５における軸線方向各端部外周の上方及び下方に位置する放熱ブロック７５・７７の当接部７５ａ・７７ａが、それぞれ各端部外周円の１／４に対応する円弧状に形成されているため、放熱ブロック７５・７７を各端部の外周全体に亘って圧接させる。（図６参照） After the above operation, the upper and lower operation members 33 are operated to move the respective heat dissipating means 25 and 27 toward each other, and the heat dissipating block with respect to the outer peripheral surface of each end in the axial direction of the centered metal shaft member 5 The abutting portions 75a and 77a of 75 and 77 are brought into pressure contact. At this time, the contact portions 75a and 77a of the heat dissipating blocks 75 and 77 positioned above and below the outer periphery of each end in the axial direction of the metal shaft 5 are arcuate shapes corresponding to ¼ of the outer periphery circles of the respective ends. Therefore, the heat dissipating blocks 75 and 77 are pressed over the entire outer periphery of each end. (See Figure 6)

なお、各電極７・９により金属軸材５を挟持したタイミング、または金属軸材５の軸線方向各端部の外周面に対して各放熱ブロック７５・７７を圧接したタイミングで上下作動部材２１ａを復動して芯出しブロック２１ｂを下方へ移動して金属軸材５の支持を解除させる。 It should be noted that the vertical operation member 21a is moved at the timing when the metal shaft member 5 is sandwiched between the electrodes 7 and 9, or at the timing when the heat dissipation blocks 75 and 77 are pressed against the outer peripheral surface of each end of the metal shaft member 5 in the axial direction. It moves backward and moves the centering block 21b downward to release the support of the metal shaft member 5.

上記動作後、軸線方向の各端面に圧接する各電極７・９間に電流が所要時間、印加されると、金属軸材５は、固有電気抵抗と印加された電流値の二乗と印加時間に応じて発生するジュール熱により所要の温度に加熱されることにより熱処理される。 After the above operation, when a current is applied between the electrodes 7 and 9 that are in pressure contact with the end faces in the axial direction for a required time, the metal shaft 5 has a specific electric resistance, a square of the applied current value, and an application time. Heat treatment is performed by heating to a required temperature by Joule heat generated accordingly.

金属軸材５に対する電流の印加直後においては、電極７・９が直接圧接する金属軸材５の軸線方向各端部側において他の箇所に比べて一時的（瞬間的）に大電流が流れて過度に加熱され、金属軸材５全体の加熱温度分布が不均一になって焼入れや焼鈍の品質を悪くする要因になっている。 Immediately after application of current to the metal shaft 5, a large current flows momentarily (instantaneously) compared to other locations on each axial end of the metal shaft 5 where the electrodes 7 and 9 are in direct pressure contact. It is heated excessively and the heating temperature distribution of the whole metal shaft 5 becomes non-uniform, which is a factor that deteriorates the quality of quenching and annealing.

本実施例においては、金属軸材５の軸線方向各端部側に圧接する放熱ブロック７５・７７により過度に加熱された該箇所の熱エネルギーを放熱させて金属軸材５における軸線方向各端部が局所的に過度に加熱されるのを防止しして全体に亘って均一に加熱し、焼入れ品質又は焼鈍品質を良好にしている。 In the present embodiment, the heat energy of the portion that is excessively heated by the heat dissipation blocks 75 and 77 that are press-contacted to the end portions in the axial direction of the metal shaft 5 is radiated to dissipate the end portions in the axial direction of the metal shaft 5. Is prevented from being excessively heated locally, and is uniformly heated over the entire area, thereby improving the quenching quality or the annealing quality.

次に、放熱手段２５・２７の具体的作用を説明すると、金属軸材５自体、その軸線方向端面は、必ずしも軸線直交方向に対して鉛直ではなく、軸線直交方向に対して若干、傾いている場合がある。このように金属軸材５を一対の電極７・９により所要の圧力で挟持すると、芯出しブロック２１ｂによる芯出し線と金属軸材５の軸心とがずれることになる。 Next, the specific action of the heat dissipating means 25 and 27 will be described. The metal shaft 5 itself and its axial end surface are not necessarily perpendicular to the axis orthogonal direction, but are slightly inclined with respect to the axis orthogonal direction. There is a case. Thus, when the metal shaft 5 is sandwiched between the pair of electrodes 7 and 9 at a required pressure, the centering line by the centering block 21b and the axis of the metal shaft 5 are shifted.

このような状態で一対の電極７・９により挟持された金属軸材５における軸線方向各端部側の外周面に対して放熱ブロック７５・７７を、その当接部７５ａ・７７ａにより金属軸材５の軸線方向各端部側外周面を囲巻するように圧接させると、図７に示すように金属軸材５の軸線方向各端部側外周面と当接部７５ａ・７７ａの当接面の間に金属軸材５の傾きに対応する間隙（空気層）が形成され、放熱ブロック７５・７７に対する金属軸材５からの熱エネルギーの熱伝導が悪くなり、安定した放熱効果を得ることができない。即ち、金属軸材５における軸線方向各端部の放熱が不安定化し、金属軸材５全体に亘る均一加熱の障害になっている。 In this state, the heat dissipating blocks 75 and 77 are attached to the outer peripheral surface of each end in the axial direction of the metal shaft 5 sandwiched between the pair of electrodes 7 and 9, and the metal shaft is supported by the contact portions 75 a and 77 a. 5, the outer peripheral surface of each end in the axial direction of the metal shaft 5 and the contact surfaces of the contact portions 75 a and 77 a are pressed as shown in FIG. A gap (air layer) corresponding to the inclination of the metal shaft member 5 is formed between them, the heat conduction of the heat energy from the metal shaft member 5 to the heat dissipation blocks 75 and 77 is deteriorated, and a stable heat dissipation effect can be obtained. Can not. That is, the heat dissipation at each end in the axial direction of the metal shaft 5 becomes unstable, which is an obstacle to uniform heating throughout the metal shaft 5.

本実施例の各放熱手段２５・２７における放熱ブロック７５・７７が取り付けられる第１及び第２搖動盤５３・５５が、昇降台２９に対して第１弾性部材４５の弾性力に抗して上記軸線と一致する方向へ移動可能な可動体３７により、また第２弾性部材４７の弾性力に抗して上記軸線と直交する方向へそれぞれ移動可能な第１及び第２取付け体４１・４３により金属軸材５の傾きに追従して記軸線と一致する方向及び軸線と直交する方向へ移動し、各当接部７５ａ・７７ａを金属軸材５における軸線方向各端部側の外周面に位置させることができる。（図８参照） The first and second sliding boards 53 and 55 to which the heat dissipation blocks 75 and 77 of the heat dissipation means 25 and 27 of the present embodiment are attached are resisted against the elastic force of the first elastic member 45 with respect to the lifting platform 29. Metal is provided by a movable body 37 that can move in a direction that coincides with the axis, and by first and second mounting bodies 41 and 43 that can move in a direction perpendicular to the axis against the elastic force of the second elastic member 47. Following the inclination of the shaft member 5, it moves in a direction that coincides with the axis line and in a direction perpendicular to the axis line, so that the contact portions 75 a and 77 a are positioned on the outer peripheral surface of each end portion side of the metal shaft member 5 in the axial direction. be able to. (See Figure 8)

また、第１及び第２取付け体４１・４３に対して第１及び第２搖動盤５３・５５が第３及び第４弾性部材５７・５９の弾性力に抗して支持軸４９・５１の先端部を中心に金属軸材５の傾きに追従して搖動し、金属軸材５における軸線方向各端部側の外周面に対して各当接部７５ａ・７７ａにおける当接面全体を圧接させることができる。（図９参照） Further, the first and second sliding plates 53, 55 against the first and second mounting bodies 41, 43 resist the elastic force of the third and fourth elastic members 57, 59 and the tips of the support shafts 49, 51. The metal shaft 5 is swung following the inclination of the metal shaft member 5 as a center, and the entire contact surfaces of the contact portions 75a and 77a are pressed against the outer peripheral surface of each end portion of the metal shaft member 5 in the axial direction. Can do. (See Figure 9)

なお、第１及び第２搖動盤５３・５５は、支持軸４９・５１の先端部にねじ止めされた駒部材６５・６７の摺接面６５ａ・６７ａに対して摺動面５３ｃ・５５ｃを摺接させることにより支持軸４９・５１の先端部を中心に搖動される。 The first and second sliding boards 53 and 55 slide the sliding surfaces 53c and 55c against the sliding contact surfaces 65a and 67a of the piece members 65 and 67 screwed to the tip ends of the support shafts 49 and 51, respectively. By making contact, the support shafts 49 and 51 are swung around the tip portions.

これにより一対の電極７・９により挟持された金属軸材５の軸心と芯出しブロック２１ｂによる芯出し線とがずれて金属軸材５が傾いている場合であっても、金属軸材５における軸線方向各端部側の外周面に対して放熱ブロック７５・７７における当接部７５ａ・７７ａの当接面全体を均一に圧接させて放熱を安定化し、金属軸材５全体の加熱温度分布を均一化することができる。（図１０参照） As a result, even if the metal shaft 5 is inclined due to a shift of the axis of the metal shaft 5 sandwiched between the pair of electrodes 7 and 9 and the centering line by the centering block 21b, the metal shaft 5 The entire contact surfaces of the contact portions 75a and 77a of the heat dissipation blocks 75 and 77 are uniformly pressed against the outer peripheral surface of each end side in the axial direction of the heat sink to stabilize heat dissipation, and the heating temperature distribution of the entire metal shaft 5 Can be made uniform. (See Figure 10)

また、金属軸材５における軸線方向各端部側の外周面に対して放熱ブロック７５・７７における当接部７５ａ・７７ａが圧接した状態で金属軸材５を直接抵抗加熱する場合、金属軸材５は、熱膨張により大径化して外周面に対する当接部７５ａ・７７ａの圧接状態を維持することが困難になる。本実施例においては、第１搖動盤５３に対して第２搖動盤５５を引寄せシリンダ７３により互いに近づく方向へ引き寄せて外周面に対する当接部７５ａ・７７ａの圧接状態を保ち、放熱ブロック７５・７７による放熱を安定化して金属軸材５全体の加熱温度分布を均一化させることができる。（図１１参照） Further, when the metal shaft 5 is directly resistance-heated in a state in which the contact portions 75a and 77a of the heat dissipation blocks 75 and 77 are in pressure contact with the outer peripheral surface of each end in the axial direction of the metal shaft 5, the metal shaft 5 5 becomes larger due to thermal expansion, and it becomes difficult to maintain the pressure contact state of the contact portions 75a and 77a with respect to the outer peripheral surface. In the present embodiment, the second sliding plate 55 is drawn toward the first sliding plate 53 in the direction approaching each other by the drawing cylinder 73 to maintain the pressure contact state of the contact portions 75a and 77a with respect to the outer peripheral surface. The heat dissipation by 77 can be stabilized and the heating temperature distribution of the entire metal shaft 5 can be made uniform. (See Figure 11)

更に、金属軸材５における軸線方向各端部側の外周面に対して放熱ブロック７５・７７における当接部７５ａ・７７ａが圧接した状態で金属軸材５を直接抵抗加熱する場合、金属軸材５は、図１２に一点鎖線で示すように熱膨張により軸線方向へ伸長し、軸線方向各端部外周面に圧接する放熱ブロック７５・７７が軸線方向端部側へ傾いて圧接状態を保つことが困難になり、放熱を安定して行えない。本実施例にあっては、上記の場合であっても、図１２に実線で示すように放熱ブロック７５・７７を固定する第１及び第２搖動盤５３・５５が設けられる第１及び第２可動体４１・４３が第１弾性部材４５の弾性力に抗して軸線方向へ移動して金属軸材５における軸線方向各端部外周面に対する放熱ブロック７５・７７の圧接を保って金属軸材５からの放熱を安定的に行うことを可能にする。 Further, when the metal shaft 5 is directly resistance-heated in a state where the contact portions 75a and 77a of the heat dissipation blocks 75 and 77 are in pressure contact with the outer peripheral surface of each end in the axial direction of the metal shaft 5, the metal shaft 5 5, the heat radiation blocks 75 and 77 that are extended in the axial direction by thermal expansion as shown by the alternate long and short dash line in FIG. 12 and are in pressure contact with the outer peripheral surface of each end in the axial direction are inclined toward the end in the axial direction to maintain the pressed state. This makes it difficult to radiate heat stably. In the present embodiment, even in the above case, the first and second sliding plates 53 and 55 for fixing the heat dissipation blocks 75 and 77 are provided as shown by the solid lines in FIG. The movable members 41 and 43 move in the axial direction against the elastic force of the first elastic member 45 to keep the heat radiation blocks 75 and 77 in pressure contact with the outer peripheral surface of each end of the metal shaft 5 in the axial direction. It is possible to perform heat radiation from 5 stably.

なお、金属軸材５の直接抵抗加熱時においては、軸線方向各端部側を除いた外周面が露出して放熱量が多くなって加熱処理が不均一になるのを防止する必要がある。軸線方向各端部側を除いた外周面からの放熱を防止するため、芯出しブロック２１ｂ間の架台３に上下一対の放熱規制手段をそれぞれ昇降するように設け、芯出しブロック２１ｂ間に応じた金属軸材５の外周面を覆うように構成すればよい。 When the metal shaft member 5 is directly resistance-heated, it is necessary to prevent the heat treatment from becoming uneven because the outer peripheral surface excluding the end portions on the axial direction is exposed to increase the heat radiation amount. In order to prevent heat dissipation from the outer peripheral surface except for each end side in the axial direction, a pair of upper and lower heat dissipation regulating means are provided on the gantry 3 between the centering blocks 21b so as to move up and down, and according to the space between the centering blocks 21b. What is necessary is just to comprise so that the outer peripheral surface of the metal shaft 5 may be covered.

上記下一対の放熱規制手段は、電極７・９により挟持された金属軸材５の上部外周面及び下部外周面に対して微小の隙間（空気層）を設けてそれぞれ相対する中空部を有した半割円筒状のセラミック等からなる上部放熱規制カバー及び下部放熱規制カバーと、これら上部放熱規制カバー及び下部放熱規制カバーを対応する金属軸材５の外周面に対して近づく位置と離間した位置の間で昇降させるシリンダ等の上下動部材により構成される。 The lower pair of heat radiation restricting means has hollow portions that are opposed to each other by providing a minute gap (air layer) with respect to the upper outer peripheral surface and the lower outer peripheral surface of the metal shaft member 5 held between the electrodes 7 and 9. The upper and lower heat release restriction covers made of a half-cylindrical ceramic or the like, and the upper heat release restriction cover and the lower heat release restriction cover are located away from the positions close to the outer peripheral surface of the corresponding metal shaft member 5. It is constituted by a vertically moving member such as a cylinder that moves up and down.

そして一対の電極７・９により金属軸材５が挟持された際に、各放熱規制カバーを金属軸材５の外周面に近づく方向へ移動して覆い、直接抵抗加熱時における放熱による温度低下を防止し、金属軸材５全体の温度分布が均一になるように加熱処理することができる。 And when the metal shaft 5 is sandwiched between the pair of electrodes 7 and 9, each heat radiation restriction cover is moved and covered in a direction approaching the outer peripheral surface of the metal shaft 5 to reduce the temperature drop due to heat radiation during direct resistance heating. It can prevent and heat-process so that the temperature distribution of the whole metal shaft 5 may become uniform.

上記説明は、軸線が水平方向を向くように供給され、軸線方向各端面に対して対応する電極７・９を圧接させて挟持された金属軸材５の軸線方向各端部側の上部外周面及び下部外周面に対して対応する放熱ブロック７５・７７をそれぞれ圧接させ、金属軸材５の直接抵抗加熱時に放熱ブロック７５・７７により軸線方向各端部側を放熱させることにより加熱温度分布を均一にする構成としたが、軸線が垂直方向（上下方向）または水平方向に対して適宜の角度で傾いた状態で供給されて一対の電極７・９により挟持された金属軸材５の軸線方向各端部側の外周面に対して対応する放熱ブロック７５・７７をそれぞれ圧接させて放熱可能にする構成であってもよい。 In the above description, the upper outer peripheral surface of each end in the axial direction of the metal shaft member 5 that is supplied so that the axis is directed in the horizontal direction and is held in pressure contact with the corresponding electrodes 7 and 9 with respect to the respective end surfaces in the axial direction. The corresponding heat radiation blocks 75 and 77 are pressed against the lower outer peripheral surface, respectively, and when the metal shaft 5 is directly resistance-heated, the heat radiation blocks 75 and 77 dissipate heat at each end in the axial direction so that the heating temperature distribution is uniform. In the axial direction of the metal shaft member 5 that is supplied in a state where the axis is inclined at an appropriate angle with respect to the vertical direction (up and down direction) or the horizontal direction and is sandwiched between the pair of electrodes 7 and 9. A configuration may be employed in which the corresponding heat radiation blocks 75 and 77 are brought into pressure contact with the outer peripheral surface on the end side so that heat can be radiated.

１直接抵抗加熱装置
３架台
５金属軸材
７・９電極
１１第２取付け台
１３電気絶縁体
１５第１取付け台
１６電気絶縁体
１７作動部材
１９ガイドロッド
２１芯出し手段
２１ａ上下作動部材
２１ｂ芯出しブロック
２３シュータ
２５・２７放熱手段
２９昇降台
３１ガイドロッド
３３上下作動部材３
３５第１移動手段の一部を構成するガイドロッド
３７第１移動手段の一部を構成する可動体
３９第２移動手段の一部を構成するガイドロッド
４１第２移動手段の一部を構成する第１取付け体
４３第２移動手段の一部を構成する第２取付け体
４５第１移動手段の一部を構成する第１弾性部材
４７第２移動手段の一部を構成する第２弾性部材
４９・５１支持軸
５３搖動手段の一部を構成する第１搖動盤
５３ａ挿通孔
５３ｂ凹所
５３ｃ摺動面
５３ｄ貫通孔
５５搖動手段の一部を構成する第２搖動盤
５５ａ挿通孔
５５ｂ凹所
５５ｃ摺接面
５７搖動手段の一部を構成する第３弾性部材
５９搖動手段の一部を構成する第４弾性部材
６５・６７搖動手段の一部を構成する駒部材
６５ａ摺接面
６７ａ摺接面
６９・７１ねじ
７３引寄せ手段としての引寄せシリンダ
７３ａ作動軸
７５・７７放熱ブロック
７５ａ・７７ａ当接部
７９・８１電気絶縁体 DESCRIPTION OF SYMBOLS 1 Direct resistance heating apparatus 3 Base 5 Metal shaft material 7 * 9 Electrode 11 2nd mounting base 13 Electrical insulator 15 1st mounting base 16 Electrical insulator 17 Actuating member 19 Guide rod 21 Centering means 21a Vertical actuating member 21b Centering Block 23 Shuta 25/27 Heat radiation means 29 Lift platform 31 Guide rod 33 Vertical operation member 3
35 A guide rod 37 constituting a part of the first moving means 37 A movable body 39 constituting a part of the first moving means 39 A guide rod 41 constituting a part of the second moving means constitutes a part of the second moving means First mounting body 43 Second mounting body 45 constituting part of second moving means First elastic member 47 constituting part of first moving means Second elastic member 49 constituting part of second moving means 51 support shaft 53 1st sliding board 53a which constitutes a part of the swinging means 53a insertion hole 53b recess 53c sliding surface 53d through hole 55 2nd sliding board 55a which constitutes a part of the swinging means 55a insertion hole 55b recess 55c Slide contact surface 57 Third elastic member 59 constituting a part of swinging means Fourth elastic member 65, 67 constituting a part of swinging means Piece 65a constituting a part of swinging means Slide contact surface 67a Slide contact surface 69 ・ 71 Screw 73 Of attracting the cylinder 73a operating shaft 75, 77 heat sink block 75a-77a abutment 79 - 81 electrical insulator

Claims

軸線方向各端面に圧接する一対の電極により挟持された金属軸材に対して所要の電流を印加して金属軸材の電気的固有抵抗により発生するジュール熱により所要の温度に加熱する直接抵抗加熱装置において、
一対の電極により挟持された金属軸材における軸線方向各端部側の外周面へ圧接可能にそれぞれ配置される放熱手段は、
上記外周面に対してそれぞれ１／４周分に亘って当接する当接部が設けられ、互いに隣接するように付勢される一対の放熱ブロックと、
各放熱ブロックを上記軸線方向へ移動可能にする第１移動手段と、
上記第１移動手段を上記軸線と直交方向へ移動可能にする第２移動手段と、
第２移動手段に対して各放熱ブロックを搖動可能に支持する搖動手段と、
を備え、
一対の電極により挟持された金属軸材軸心の傾きに追従して各放熱ブロックを上記軸線と一致する方向及び軸線と直交する方向へ移動可能にすると共に水平方向に対して搖動可能にしてそれぞれの当接部を上記外周面へ当接して直接抵抗加熱される金属軸材からの放熱を可能にした直接抵抗加熱装置。 Direct resistance heating in which a required current is applied to a metal shaft sandwiched between a pair of electrodes pressed against each end face in the axial direction to heat it to the required temperature by Joule heat generated by the electrical resistivity of the metal shaft In the device
The heat dissipating means respectively disposed so as to be able to press contact with the outer peripheral surface on each end side in the axial direction in the metal shaft member sandwiched between the pair of electrodes,
A pair of heat dissipating blocks provided with abutting portions that are in contact with the outer peripheral surface over a quarter of each circumference and biased so as to be adjacent to each other;
First moving means for allowing each heat dissipating block to move in the axial direction;
Second moving means for moving the first moving means in a direction orthogonal to the axis;
Peristaltic means for supporting each heat dissipating block relative to the second moving means;
With
Following the inclination of the axis of the metal shaft sandwiched between the pair of electrodes, each heat dissipating block can be moved in the direction coincident with the axis and in the direction perpendicular to the axis, and can be moved in the horizontal direction. A direct resistance heating device that enables heat radiation from a metal shaft member that is directly resistance heated by abutting the abutting portion on the outer peripheral surface.

請求項１において、
第１移動手段は、
上記軸線と一致する方向へ移動可能に支持される可動体と、
可動体を上記軸線と一致する方向の中間部に位置するように付勢する第１弾性部材と、
からなる直接抵抗加熱装置。 In claim 1,
The first moving means is
A movable body supported so as to be movable in a direction matching the axis;
A first elastic member for biasing the movable body so as to be positioned at an intermediate portion in a direction coinciding with the axis;
Direct resistance heating device consisting of.

請求項１において、
第２移動手段は、
第１移動手段に対して上記軸線と直交する方向へ移動可能にそれぞれ支持される一対の取付け体と、
各取付け体を互いに近づく方向へ付勢する第２弾性部材と、
からなる直接抵抗加熱装置。 In claim 1,
The second moving means is
A pair of attachments each supported so as to be movable in a direction perpendicular to the axis with respect to the first moving means;
A second elastic member for urging each mounting body toward each other;
Direct resistance heating device consisting of.

請求項１において、
搖動手段は、
第２移動手段に抜け止めされた状態で水平方向に対して搖動可能にそれぞれ支持される一対の搖動盤と、
各搖動盤を水平状態に付勢する第３及び第４弾性部材と、
からなる直接抵抗加熱装置。 In claim 1,
Peristalsis means
A pair of sliding boards each supported so as to be swingable in the horizontal direction while being retained by the second moving means;
Third and fourth elastic members for urging each sliding plate in a horizontal state;
Direct resistance heating device consisting of.

請求項１において、
一方の放熱ブロックに対して他方の放熱ブロックを近づく方向へ引き寄せる引寄せ手段を設けた直接抵抗加熱装置。 In claim 1,
A direct resistance heating device provided with drawing means for drawing the other heat dissipation block closer to one heat dissipation block.

請求項５において、
引寄せ手段は、上記軸線直交方向に軸線を有して一方の搖動盤に取り付けられ、作動軸が他方の搖動盤に連結されたシリンダ部材からなる直接抵抗加熱装置。 In claim 5,
The attracting means is a direct resistance heating device comprising a cylinder member having an axis in the direction orthogonal to the axis and attached to one sliding plate and having an operating shaft connected to the other sliding plate.