JP2019128113A

JP2019128113A - Heat treatment furnace

Info

Publication number: JP2019128113A
Application number: JP2018010840A
Authority: JP
Inventors: 智比古大越; Tomohiko Ogoshi; 渡辺　進; Susumu Watanabe; 進渡辺
Original assignee: Daido Steel Co Ltd; Daido Plant Industries Co Ltd
Current assignee: Daido Steel Co Ltd; Daido Plant Industries Co Ltd
Priority date: 2018-01-25
Filing date: 2018-01-25
Publication date: 2019-08-01
Anticipated expiration: 2038-01-25
Also published as: JP6905947B2

Abstract

To provide a heat treatment furnace capable of suppressing variation in the heat treatment quality of a workpiece by a simple constitution.SOLUTION: Provided is a heat treatment where a metallic workpiece W having a through hole is subjected to heat treatment, comprising: a furnace body 10 having a temperature adjustment part 30 capable of adjusting the atmosphere of the inside to a prescribed temperature; and a skewer(s) member 40 capable of being inserted into the through hole of the workpiece W and provided at the inside of the temperature regulation member 30 with the axis directed in the direction intersecting the direction of gravity. It is preferable that the skewer(s) member 40 is radially plurally provided with a rotary axis 24 provided at the inside of the furnace body 10 as the center and is rotated around the rotary axis 24.SELECTED DRAWING: Figure 3

Description

本発明は、熱処理炉に関するものであり、さらに詳しくは、貫通孔を有するワークを加熱するための熱処理炉に関するものである。 The present invention relates to a heat treatment furnace, and more particularly to a heat treatment furnace for heating a workpiece having through holes.

鍛造等の熱間加工を経た後の金属製のワークに対して、焼ならしを施す等の目的で、所定温度に内部空間を加熱することができる熱処理炉が用いられる。熱処理炉において、ワークは、炉内を搬送されながら、徐冷等の処理を受ける。この種の熱処理炉は、例えば特許文献１に開示されている。 A heat treatment furnace is used which can heat the internal space to a predetermined temperature for the purpose of normalizing a metal work after hot working such as forging. In the heat treatment furnace, the work is subjected to a treatment such as slow cooling while being conveyed in the furnace. A heat treatment furnace of this type is disclosed, for example, in Patent Document 1.

特開２０１２−１６３２３１号公報JP2012-163231A

特許文献１に開示されているように、従来一般の熱処理炉においては、ワークは、棚板やトレーやコンベア等の面状の保持部材に載置された状態で、熱処理を受ける。この場合、ワークと保持部材の間の接触面において、局所的にワークの熱が保持部材に奪われる抜熱が生じる。すると、単一のワーク内において、部分ごとに温度差が生じ、熱処理品質にばらつきが生じる。つまり、金属材料の組織変化が不均一に起こりやすくなり、均一な組織および物性を有するワークが得にくくなる。特に、保持部材の上にワークを無秩序に積載する場合には（バラ積み）、ワーク個体間でも熱処理品質にばらつきが生じやすくなる。このような熱処理品質のばらつきを抑えるための手段として、炉内に均熱ゾーンを設ける等の方策が考えられるが、この場合には、炉が大型化するとともに、炉全体としての熱効率が低くなってしまう。 As disclosed in Patent Document 1, in a conventional general heat treatment furnace, a work is subjected to heat treatment in a state where it is placed on a planar holding member such as a shelf plate, a tray, or a conveyor. In this case, at the contact surface between the work and the holding member, heat removal from the heat of the work taken by the holding member occurs locally. Then, in a single workpiece, a temperature difference occurs for each part, and the heat treatment quality varies. That is, the structure change of the metal material is likely to be uneven, and it becomes difficult to obtain a work having uniform structure and physical properties. In particular, when workpieces are loaded on a holding member in a random order (stacked in bulk), the heat treatment quality tends to vary among the workpieces. As means for suppressing such variations in heat treatment quality, it is conceivable to provide a soaking zone in the furnace, but in this case the furnace becomes larger and the thermal efficiency of the furnace as a whole becomes lower. It will

本発明が解決しようとする課題は、簡素な構成により、ワークの熱処理品質のばらつきを抑えることができる熱処理炉を提供することにある。 The problem to be solved by the present invention is to provide a heat treatment furnace capable of suppressing the variation in the heat treatment quality of a workpiece with a simple configuration.

上記課題を解決するために、本発明にかかる熱処理炉は、貫通孔を有する金属製のワークを熱処理する熱処理炉において、内部の雰囲気を所定温度に調節可能な温度調節部を有する炉体と、前記ワークの貫通孔に挿通可能であり、重力方向と交差する方向に軸を向けて前記温度調節部内に設けられた串部材と、を有することを要旨とする。 In order to solve the above-mentioned subject, the heat treatment furnace concerning the present invention heat-treat furnace which heat-treats metal work which has a penetration hole, and has a furnace which has a temperature control part which can adjust internal atmosphere to predetermined temperature, A gutter member may be inserted into the through hole of the work, and may be provided in the temperature control section with its axis directed in the direction intersecting the gravity direction.

ここで、前記串部材は、前記炉体内に設けられた回転軸を中心として放射状に複数設けられ、前記回転軸の周りに回転されることが好ましい。 Here, it is preferable that a plurality of the wedge members be provided radially around a rotation axis provided in the furnace body, and be rotated around the rotation axis.

また、前記炉体の外周部を構成する外周壁と前記回転軸の間には内壁が設けられ、前記回転軸と前記内壁の間の空間として前記温度調節部が設けられ、前記串部材の基端は、前記内壁に取り付けられていることが好ましい。 Further, an inner wall is provided between the outer peripheral wall constituting the outer peripheral portion of the furnace body and the rotary shaft, the temperature control unit is provided as a space between the rotary shaft and the inner wall, and a base of the wedge member The end is preferably attached to the inner wall.

上記発明にかかる熱処理炉においては、重力方向と交差する方向に軸を向けて配置された串部材を、ワークの貫通孔に挿通して、ワークを炉体の温度調節部内で保持することができる。各ワークを貫通孔の内壁の小面積の領域だけで串部材に接触させた状態でワークを保持することができるので、棚板等の面状の保持部材にワークを載置する場合と比較して、保持部材である串部材による抜熱を小さく抑えることができる。これにより、ワークの熱処理品質の均一性が高くなり、熱処理を経て、金属組織や物性の均一性が高いワークを安定して得ることができる。このように、串部材を温度調節部に設けるという簡素な構成により、貫通孔を有するワークに対して、均質性に優れた熱処理を施すことができる熱処理炉が得られる。 In the heat treatment furnace according to the present invention, the work can be held in the temperature control portion of the furnace body by inserting the wedge member disposed with its axis directed in the direction intersecting the gravity direction into the through hole of the work. . Since the work can be held in a state where each work is in contact with the wedge member only in the small area region of the inner wall of the through hole, compared to the case where the work is placed on a planar holding member such as a shelf board Thus, it is possible to suppress heat removal by the wedge member which is the holding member to a low level. As a result, the uniformity of the heat treatment quality of the workpiece is enhanced, and a workpiece having high uniformity of metal structure and physical properties can be stably obtained through the heat treatment. Thus, the heat treatment furnace which can heat-process excellent in homogeneity with respect to the work which has a penetration hole by the simple composition of providing a weir member in a temperature control part is obtained.

ここで、串部材が、前記炉体内に設けられた回転軸を中心として放射状に複数設けられ、回転軸の周りに回転される場合には、串部材を回転軸の周りに回転させながら熱処理を行うことで、串部材で保持した複数のワークを、高い均質性をもって連続的に熱処理しやすくなる。また、串部材の回転を利用して、温度調節部内へのワークの搬入および温度調節部からのワークの搬出を行いやすくなる。 Here, if a plurality of wedge members are provided radially around a rotation axis provided in the furnace body, and if it is rotated around the rotation axis, heat treatment is performed while rotating the wedge member around the rotation axis By doing this, the plurality of workpieces held by the wedge member can be easily heat-treated continuously with high homogeneity. In addition, it is easy to carry in the work into the temperature control unit and carry out the work from the temperature control unit by using the rotation of the wedge member.

また、炉体の外周部を構成する外周壁と回転軸の間に内壁が設けられ、回転軸と内壁の間の空間として温度調節部が設けられ、串部材の基端が、内壁に取り付けられている場合には、高い熱効率と均質性をもって、ワークの熱処理を行いやすくなる。 Further, an inner wall is provided between the outer peripheral wall constituting the outer peripheral portion of the furnace body and the rotating shaft, a temperature control unit is provided as a space between the rotating shaft and the inner wall, and a base end of the wedge member is attached to the inner wall In this case, it becomes easy to heat treat the workpiece with high thermal efficiency and homogeneity.

本発明の一実施形態にかかる熱処理炉の概略を示す水平断面図である。It is a horizontal sectional view showing an outline of a heat treatment furnace concerning one embodiment of the present invention. 上記熱処理炉の鉛直断面図である。It is a vertical sectional view of the above-mentioned heat treatment furnace. ワークを保持した状態を示す熱処理炉の水平断面図である。It is a horizontal sectional view of a heat treatment furnace showing the state where a work was held. ワークを保持した状態を示す熱処理炉の鉛直断面図である。It is a perpendicular sectional view of a heat treatment furnace showing a state where a work is held. ワークの形状を示す斜視図である。It is a perspective view which shows the shape of a workpiece | work.

以下、本発明の一実施形態にかかる熱処理炉について、図面を参照しながら説明する。図１〜４に概略を示す本発明の一実施形態にかかる熱処理炉１は、鍛造等の熱間加工を経た後の金属製のワークＷを、徐冷により焼ならしするものである。なお、各図面において、断面を示すハッチングは省略している。 Hereinafter, a heat treatment furnace according to an embodiment of the present invention will be described with reference to the drawings. A heat treatment furnace 1 according to an embodiment of the present invention schematically shown in FIGS. 1 to 4 is to normalize a metal work W after hot working such as forging by slow cooling. In each of the drawings, hatching indicating a cross section is omitted.

［ワークの構成］
本発明の一実施形態にかかる熱処理炉１は、ワークＷの形状を利用することで、簡素な構成で、均質性の高い熱処理を実施するものであり、ワークＷは所定の形状を有する。つまり、ワークＷは、貫通孔Ｗ１を有する金属部材よりなっている。貫通孔Ｗ１を有していれば、どのような外形を有していてもかまわないが、例えば、図５に示すように、円筒状（ドーナツ状）のワークＷを、好適な熱処理対象として例示することができる。円筒状であれば、その中心軸の周りに対称な形状となっているので、熱処理の均一性を特に高くすることができる。 [Work configuration]
The heat treatment furnace 1 according to an embodiment of the present invention performs heat treatment with high uniformity with a simple configuration by utilizing the shape of the work W, and the work W has a predetermined shape. That is, the workpiece W is made of a metal member having a through hole W1. Any external shape may be used as long as it has the through hole W1. For example, as shown in FIG. 5, a cylindrical (donut-like) work W is exemplified as a suitable heat treatment target can do. If it is cylindrical, since it has a symmetrical shape around its central axis, the uniformity of the heat treatment can be made particularly high.

ワークＷを構成する金属材料は、鍛造等の熱間加工の後に、焼きならし等、所定の熱処理を経ることで、金属組織や物性を制御することができるものならば、どのようなものであってもかまわない。その種の金属材料の例として、肌焼鋼を例示することができる。特に好適な鋼種として、ＳＣＲ４２０やＳＣＭ４２０等を挙げることができる。 The metal material constituting the work W may be any material as long as it can control the metal structure and physical properties by subjecting it to a predetermined heat treatment such as normalizing after hot working such as forging. It does not matter. As an example of such a metal material, case-hardened steel can be illustrated. SCR420, SCM420 grade | etc., Can be mentioned as a especially suitable steel type.

［熱処理炉の構成］
次に、本発明の一実施形態にかかる熱処理炉１の構成について説明する。熱処理炉１においては、串部材４０を除いて、特許文献１に記載される従来一般の熱処理炉と同様の構成を適用することができる。 [Composition of heat treatment furnace]
Next, the structure of the heat treatment furnace 1 according to one embodiment of the present invention will be described. In the heat treatment furnace 1, except for the skewer member 40, the same configuration as the conventional general heat treatment furnace described in Patent Document 1 can be applied.

熱処理炉１は、炉体１０を本体としてなる。炉体１０は、軸を略鉛直に配置した略円筒状の外周壁１１と、外周壁１１の内側に、外周壁１１と同軸状に設けた略円筒状の内壁１２とを有している。炉体１０はさらに、外周壁１１に囲まれた領域の上端部と下端部をそれぞれ閉塞する上壁１４および下壁１６を有している。外周壁１１および上壁１４、下壁１６は金属酸化物等の耐火物よりなっている。内壁１２は、軸方向に外周壁１１よりも短く形成されており、上端部および下端部がそれぞれ上壁１４および下壁１６から離れている。 The heat treatment furnace 1 has a furnace body 10 as a main body. The furnace body 10 has a substantially cylindrical outer peripheral wall 11 with its axis disposed substantially vertically, and a substantially cylindrical inner wall 12 coaxial with the outer peripheral wall 11 inside the outer peripheral wall 11. The furnace body 10 further has an upper wall 14 and a lower wall 16 which close the upper end and the lower end of the region surrounded by the outer peripheral wall 11 respectively. The outer peripheral wall 11, the upper wall 14, and the lower wall 16 are made of a refractory such as a metal oxide. The inner wall 12 is formed shorter in the axial direction than the outer peripheral wall 11, and the upper end and the lower end are separated from the upper wall 14 and the lower wall 16, respectively.

外周壁１１には、後述する串部材４０に対応する高さ位置に、ワークＷを出し入れできる開口部として、搬入口１８と搬出口２０が設けられている。なお、特許文献１に示されるように、搬入口１８と搬出口２０を別に設けず、１つの開口部からワークＷの出し入れの両方を行うようにしてもよい。 A carry-in port 18 and a carry-out port 20 are provided on the outer peripheral wall 11 as opening portions through which the work W can be taken in and out at a height position corresponding to a scissor member 40 described later. Note that as shown in Patent Document 1, the loading port 18 and the unloading port 20 may not be separately provided, and both of the work W may be taken in and out from one opening.

略円筒状の外周壁１１および内壁１２の中心には、回転軸２４が設けられている。回転軸２４は、炉体１０の上壁１４および下壁１６を貫通しており、図示しない回転機構に連結されている。回転機構によって回転軸２４の軸回転を駆動することができる。内壁１２の上端部および下端部には、それぞれ端板２６，２６が設けられ、端板２６，２６が略円筒状の内壁１２の上下の開口を閉塞するとともに、内壁１２を回転軸２４に固定している。これにより、回転機構を用いて回転軸２４を軸回転させることで、内壁１２が回転軸２４を中心に回転される。 A rotation shaft 24 is provided at the center of the substantially cylindrical outer peripheral wall 11 and inner wall 12. The rotating shaft 24 penetrates the upper wall 14 and the lower wall 16 of the furnace body 10, and is connected to a rotating mechanism (not shown). The rotation of the rotation shaft 24 can be driven by the rotation mechanism. End plates 26, 26 are provided at the upper end portion and the lower end portion of the inner wall 12, and the end plates 26, 26 close the upper and lower openings of the substantially cylindrical inner wall 12 and fix the inner wall 12 to the rotating shaft 24. doing. Thereby, the inner wall 12 is rotated around the rotation shaft 24 by rotating the rotation shaft 24 using the rotation mechanism.

熱処理炉１において、外周壁１１と内壁１２の間の空間、詳細には、外周壁１１と内壁１２、上壁１４と下壁１６、２つの端板２６，２６によって囲まれて閉塞される空間が、温度調節部３０となっている。炉体１０の外周壁１１の内側面には、例えばシーズヒータよりなる加熱部２８が設けられており、温度調節部３０内の雰囲気を加熱することができる。そして、上壁１４には、温度調節部３０に連通した複数の開口が設けられ、それぞれに、冷気を導入できる冷却ブロア３２、気体を排出する排気ダクト３４、気体を循環させる循環ファン３６が設けられている。加熱部２８、冷却ブロア３２、排気ダクト３４、循環ファン３６の出力を組み合わせて制御することで、温度調節部３０内の雰囲気を、所定の温度に調節することができる。熱間加工後のワークＷに対して焼ならしを行う場合には、炉体外部の温度よりも高く、かつワークＷの温度よりも低い温度に、温度調節部３０内の雰囲気を調節すればよい。 In the heat treatment furnace 1, a space between the outer peripheral wall 11 and the inner wall 12, specifically, a space surrounded and closed by the outer peripheral wall 11 and the inner wall 12, the upper wall 14 and the lower wall 16, and two end plates 26 and 26. However, the temperature adjustment unit 30 is provided. A heating unit 28 formed of, for example, a sheathed heater is provided on the inner side surface of the outer peripheral wall 11 of the furnace body 10, and the atmosphere in the temperature control unit 30 can be heated. The upper wall 14 is provided with a plurality of openings communicating with the temperature control unit 30, and provided with a cooling blower 32 capable of introducing cold air, an exhaust duct 34 discharging the gas, and a circulation fan 36 circulating the gas. It is done. By combining and controlling the outputs of the heating unit 28, the cooling blower 32, the exhaust duct 34, and the circulation fan 36, the atmosphere in the temperature control unit 30 can be adjusted to a predetermined temperature. When normalizing the workpiece W after hot working, if the atmosphere in the temperature control unit 30 is adjusted to a temperature higher than the temperature outside the furnace body and lower than the temperature of the workpiece W Good.

炉体１０の温度調節部３０の中には、複数の棒状の串部材４０が設けられている。串部材４０は、基端が内壁１２の外側面に固定され、軸を略水平に向けて、外側へ向かって突出している。串部材４０の先端は、外周壁１１に接触していない。串部材４０は、回転軸２４に沿って、複数の段に設けられている（図の例では４段）。各段において、串部材４０は、回転軸２４を中心として対称になるように、放射状に設けられている。串部材４０は、ワークＷよりも高い耐熱性を有する金属材料よりなることが好ましい。 A plurality of rod-like skewer members 40 are provided in the temperature control unit 30 of the furnace body 10. The wedge member 40 is fixed at its proximal end to the outer surface of the inner wall 12 and protrudes outward with the axis substantially horizontal. The tip of the wedge member 40 is not in contact with the outer peripheral wall 11. The skewer member 40 is provided in a plurality of steps along the rotation shaft 24 (four steps in the example in the figure). In each stage, the skewer members 40 are provided radially so as to be symmetric about the rotation axis 24. The wedge member 40 is preferably made of a metal material having heat resistance higher than that of the work W.

串部材４０の外径は、ワークＷの貫通孔Ｗ１の孔径よりも小さく設定されている。串部材４０の先端側から、串部材４０をワークＷの貫通孔Ｗ１に挿通し、串部材４０にワークＷを吊るすことで、ワークＷを温度調節部３０内で保持することができる。１本の串部材４０で複数のワークＷを保持することができる（図では５個）。串部材４０の長さおよび串部材４０を設ける段数、各段における串部材４０の数を適切に定めることで、同じ串部材４０に保持されたワークＷの間、そして隣接する串部材４０に保持されたワークＷの間で、接触が起こらないようにして、あるいは小面積でのみ接触するようにして、多数のワークＷを炉体１０内に収容することができる。 The outer diameter of the skewer member 40 is set smaller than the hole diameter of the through hole W1 of the workpiece W. The work W can be held in the temperature control unit 30 by inserting the wedge member 40 into the through hole W 1 of the work W from the tip end side of the wedge member 40 and suspending the work W on the wedge member 40. A plurality of workpieces W can be held by one skewer member 40 (five in the figure). By appropriately determining the length of the wedge member 40 and the number of steps for providing the wedge member 40, and the number of wedge members 40 in each row, the workpiece W held by the same wedge member 40 is held by the adjacent wedge members 40 A large number of workpieces W can be accommodated in the furnace body 10 such that contact does not occur between the workpieces W or contact with only a small area.

搬入口１８および搬出口２０の外側には、ワークＷを把持して串部材４０への抜き差しを行うことができるロボット（不図示）が備えられている。ロボットとしては、前後動可能な爪状の把持部を複数備え、円筒状のワークＷの端面の一方側から、ワークＷを把持するものを例示することができる。ロボットが、ある串部材４０の位置に貫通孔Ｗ１の位置を合わせた状態でワークＷを把持し、搬入口１８を介して温度調節部３０内に搬入して、串部材４０の軸に沿って前進させることで、ワークＷを串部材４０に掛けることができる。串部材４０に掛けたワークＷを串部材４０の基端側に押し、次のワークＷを掛ければ、１本の串部材４０に複数のワークＷを順次掛けることができる。また、串部材４０に保持されたワークＷを、ロボットが搬出口２０を介して把持部で把持し、後退させることで、ワークＷを串部材４０から外すことができる。 A robot (not shown) capable of gripping the workpiece W and inserting and removing the wedge member 40 is provided outside the loading port 18 and the unloading port 20. As the robot, one having a plurality of claw-like gripping portions capable of moving back and forth, and gripping the workpiece W from one side of the end face of the cylindrical workpiece W can be exemplified. The robot holds the work W in a state where the position of the through hole W1 is aligned with the position of the wedge member 40, carries the workpiece W into the temperature control unit 30 via the inlet 18, and extends along the axis of the wedge member 40. The work W can be hung on the wedge member 40 by moving it forward. If the workpiece W hung on the wedge member 40 is pushed toward the base end side of the wedge member 40 and then the next workpiece W is hung, a plurality of works W can be sequentially hung on one wedge member 40. Further, the work W can be removed from the wedge member 40 by the robot holding the workpiece W held by the wedge member 40 at the holding portion via the outlet 20 and moving it backward.

回転軸２４を間欠的に軸回転させることで、内壁１２に固定された串部材４０が回転軸２４を中心として回転され、串部材４０に保持されたワークＷが炉内を移動することになる。ロボットを利用して、回転軸２４の回転と同期させながら、熱間加工を受けたワークＷを搬入口１８から炉内に搬入するとともに、熱処理炉１内を約１周して熱処理を受け終えたワークＷを搬出口２０から搬出することで、多数のワークＷを連続的に熱処理することができる。 By intermittently rotating the rotating shaft 24, the wedge member 40 fixed to the inner wall 12 is rotated about the rotating shaft 24, and the work W held by the wedge member 40 moves in the furnace. . While using the robot to synchronize the rotation of the rotary shaft 24 and carry the hot-worked workpiece W into the furnace from the loading port 18, finish the heat treatment furnace 1 for about 1 round and receive the heat treatment By unloading the workpieces W from the carry-out port 20, a large number of workpieces W can be continuously heat-treated.

本実施形態にかかる熱処理炉１においては、上記のように、略水平に軸を向けて設置された串部材４０をワークＷの貫通孔Ｗ１に挿通し、ワークＷを串部材４０に掛けることで、熱処理を受けるワークＷを保持している。ワークＷを保持する保持部材である串部材４０とワークＷとの間の接触部位は、ワークＷの貫通孔Ｗ１の内壁の小さい面積の領域に限定される。これにより、保持部材とワークＷとの間の接触部からワークＷの熱が保持部材によって奪われる抜熱が抑制される。そして、単一のワークＷの中で、温度分布が生じることが抑制される。その結果、保持部材が棚板やトレー、コンベア等の面状の部材よりなり、その上にワークＷを載置して保持する場合と比較して、単一のワークＷ内での熱処理品質のばらつきが小さくなり、金属組織や物性の空間的均一性が高くなる。同一の串部材４０に保持された複数のワークＷの間、また隣接する串部材４に保持された複数のワークＷの間の接触面積も、棚板等に無秩序に複数のワークＷを載置する場合と比較して、小さく抑えることができるので、ワークＷの個体間での熱処理品質のばらつきも小さく抑えることができる。 In the heat treatment furnace 1 according to the present embodiment, as described above, the wedge member 40 installed with its axis substantially horizontal is inserted into the through hole W1 of the workpiece W, and the workpiece W is hung on the wedge member 40. The workpiece W subjected to heat treatment is held. The contact portion between the skewer member 40 that is a holding member that holds the workpiece W and the workpiece W is limited to a small area of the inner wall of the through hole W1 of the workpiece W. As a result, heat removal from the contact portion between the holding member and the work W is suppressed by the holding member. And generation | occurrence | production of temperature distribution in the single workpiece | work W is suppressed. As a result, the holding member is made of a planar member such as a shelf plate, a tray, or a conveyor. The variation is reduced, and the spatial uniformity of the metal structure and physical properties is increased. The contact areas between the plurality of workpieces W held by the same skewer member 40 and between the plurality of workpieces W held by the adjacent skewer members 4 are also placed on the shelf board in a random manner. Compared with the case where it does, since it can suppress small, the dispersion | variation in the heat processing quality between the workpiece | work W individuals can also be suppressed small.

また、熱処理品質のばらつきを小さく抑えられることにより、上記のように、全体として温度制御した温度調節部３０内で約１周にわたってワークＷを移動させるだけの簡素な熱処理炉１によって、ワークＷに均一性の高い熱処理を施すことができる。ワークＷを一旦所定の温度まで加熱する均熱ゾーン等、温度調節部３０以外の空間を熱処理品質の均質化を目的として炉内に設ける必要はない。その結果、従来に比べて、熱処理炉１を小型化することができる。また均熱ゾーン等の空間を加熱するための熱源が省略されることにより、熱処理炉１全体としての熱効率を高めることができる。 In addition, since the variation in the heat treatment quality can be suppressed to a small value, as described above, the work W can be moved by the simple heat treatment furnace 1 which only moves the work W over about one turn in the temperature control unit 30 whose temperature is controlled overall. A highly uniform heat treatment can be performed. It is not necessary to provide a space other than the temperature control unit 30, such as a soaking zone for temporarily heating the work W to a predetermined temperature, in a furnace for the purpose of homogenizing the heat treatment quality. As a result, the heat treatment furnace 1 can be miniaturized as compared with the prior art. Moreover, the heat efficiency as the whole heat-treatment furnace 1 can be improved by the heat source for heating space, such as a soaking zone, being abbreviate | omitted.

串部材４０にワークＷを吊るすようにして保持することには、熱処理品質の均質化以外の利点もある。略水平に突出した串部材４０をワークＷの貫通孔Ｗ１に挿通し、重力によってワークＷを吊り下げることで、ワークＷの姿勢および位置がその状態から変化しにくく、熱処理工程全体を安定に実行することができる。また、保持部材として棚板等の面状の部材を利用する場合と比較して、ワークＷを温度調節部３０内に高密度に収容することが可能となる。さらに、ロボットを用いて連続的にワークＷを串部材４０に対して抜き差しする場合に、ロボットがワークＷを把持するとともに前後動させるだけで、抜き差しの動作を行うことができる。この観点から、串部材４０の先端等には、ワークＷの落下防止等を目的として、軸と交差する方向に突出した構造が設けられないことが好ましく、上記のように、串部材４０が単純な棒状構造よりなることが好ましい。 Holding the workpiece W by hanging it on the wedge member 40 has an advantage other than homogenization of the heat treatment quality. By inserting the skewer member 40 protruding substantially horizontally into the through hole W1 of the workpiece W and suspending the workpiece W by gravity, the posture and position of the workpiece W are not easily changed from the state, and the entire heat treatment process is stably performed. can do. Further, the work W can be accommodated in the temperature control unit 30 at a high density as compared with the case where a planar member such as a shelf is used as the holding member. Furthermore, when the workpiece W is continuously inserted into and removed from the wedge member 40 using the robot, the insertion and removal operation can be performed only by holding the workpiece W and moving it back and forth. From this point of view, it is preferable that the tip end of the wedge member 40 is not provided with a structure projecting in the direction intersecting with the axis for the purpose of preventing the drop of the work W and the like. It is preferable that it consists of a rod-shaped structure.

なお、本実施形態においては、串部材４０の軸を略水平に配置しており、それによって、同じ串部材４０に保持されたワークＷ間の接触面積を小さくすることができ、またロボットによるワークＷの抜き差しを容易に行うことができる。ただし、必ずしも串部材４０の突出方向は水平に限られるものではなく、重力方向と交差する方向に軸を向けていればよい。 In the present embodiment, the axis of the wedge member 40 is disposed substantially horizontally, whereby the contact area between the workpieces W held by the same wedge member 40 can be reduced, and the workpiece by the robot can be reduced. W can be easily inserted and removed. However, the projecting direction of the wedge member 40 is not necessarily limited to the horizontal direction, and the axis may be oriented in the direction intersecting the gravity direction.

本実施形態においては、回転軸２４を中心として回転される内壁１２から突出させて串部材４０が設けられたが、内壁１２に限らず、炉体１０を構成する任意の部材に串部材４０を固定するようにしてもよい。しかし、上記のように、複数の串部材４０を回転軸２４の周りに対称になるように放射状に突出させ、回転軸２４の周りを回転させることで、多数のワークＷに対して、個体間での熱処理品質のばらつきを抑えた状態で、連続的に熱処理を行いやすくなる。さらに、回転軸２４と内壁１２の間に空間を設け、串部材４０を回転軸２４から離れた内壁１２の面から突出させることで、温度調節部３０の加熱における熱処理効率を高めることができる。内壁１２を設けずに外周壁１１の内側の領域を全て温度調節部３０とし、串部材４０を回転軸２４から直接突出させる場合よりも、隣接するワークとの接触を小さくしながら保持できるワークＷの数に対して、加熱が必要な温度調節部３０の容積が小さくなるためである。また、串部材４０の基端側に配置したワークＷと先端側に配置したワークＷの間での熱処理品質のばらつきも、小さく抑えることができる。 In the present embodiment, the weir member 40 is provided so as to protrude from the inner wall 12 rotated around the rotation shaft 24. However, the weir member 40 is not limited to the inner wall 12 but may be any member constituting the furnace body 10. It may be fixed. However, as described above, by causing the plurality of wedge members 40 to radially project so as to be symmetrical around the rotation axis 24 and rotating around the rotation axis 24, the inter-individuals can be obtained for a large number of workpieces W. It becomes easy to perform the heat treatment continuously in a state in which the variation in the heat treatment quality is suppressed. Furthermore, by providing a space between the rotating shaft 24 and the inner wall 12 and projecting the wedge member 40 from the surface of the inner wall 12 away from the rotating shaft 24, the heat treatment efficiency in heating the temperature control unit 30 can be enhanced. A workpiece W which can be held while reducing contact with an adjacent workpiece compared to the case where the entire inner region of the outer peripheral wall 11 is the temperature control unit 30 without providing the inner wall 12 and the wedge member 40 is directly protruded from the rotating shaft 24 The volume of the temperature control unit 30 that requires heating is smaller than the number of heat sinks. Further, the variation in the heat treatment quality between the work W disposed on the base end side of the wedge member 40 and the work W disposed on the tip end side can also be suppressed to a small value.

以上、本発明の実施形態について詳細に説明したが、本発明は上記実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲で種々の改変が可能である。 As mentioned above, although embodiment of this invention was described in detail, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of this invention.

１熱処理炉
１０炉体
１１外周壁
１２内壁
１８搬入口
２０搬出口
２４回転軸
２６端板
２８加熱部
３０温度調節部
３２冷却ブロア
３４排気ダクト
３６循環ファン
４０串部材
Ｗワーク
Ｗ１貫通孔 DESCRIPTION OF SYMBOLS 1 heat treatment furnace 10 furnace body 11 outer peripheral wall 12 inner wall 18 inlet 20 outlet 24 rotary shaft 26 end plate 28 heating unit 30 temperature control unit 32 cooling blower 34 exhaust duct 36 circulation fan 40 heat sink member W work W1 through hole

Claims

貫通孔を有する金属製のワークを熱処理する熱処理炉において、
内部の雰囲気を所定温度に調節可能な温度調節部を有する炉体と、
前記ワークの貫通孔に挿通可能であり、重力方向と交差する方向に軸を向けて前記温度調節部内に設けられた串部材と、を有することを特徴とする熱処理炉。 In a heat treatment furnace for heat treating a metal workpiece having a through hole,
A furnace body having a temperature control unit capable of adjusting the internal atmosphere to a predetermined temperature;
A heat treatment furnace characterized by comprising: a wedge member which can be inserted into the through hole of the work and which is provided in the temperature control section with its axis directed in the direction intersecting the gravity direction.

前記串部材は、前記炉体内に設けられた回転軸を中心として放射状に複数設けられ、前記回転軸の周りに回転されることを特徴とする請求項１に記載の熱処理炉。 The heat treatment furnace according to claim 1, wherein a plurality of the weir members are provided radially around a rotation axis provided in the furnace body, and rotated around the rotation axis.

前記炉体の外周部を構成する外周壁と前記回転軸の間には内壁が設けられ、前記回転軸と前記内壁の間の空間として前記温度調節部が設けられ、
前記串部材の基端は、前記内壁に取り付けられていることを特徴とする請求項２に記載の熱処理炉。 An inner wall is provided between an outer peripheral wall constituting an outer peripheral portion of the furnace body and the rotary shaft, and the temperature control unit is provided as a space between the rotary shaft and the inner wall,
The heat treatment furnace according to claim 2, wherein a base end of the skewer member is attached to the inner wall.