JP4232963B2 - High frequency induction heating equipment for metal pipes - Google Patents

High frequency induction heating equipment for metal pipes Download PDF

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JP4232963B2
JP4232963B2 JP2004007431A JP2004007431A JP4232963B2 JP 4232963 B2 JP4232963 B2 JP 4232963B2 JP 2004007431 A JP2004007431 A JP 2004007431A JP 2004007431 A JP2004007431 A JP 2004007431A JP 4232963 B2 JP4232963 B2 JP 4232963B2
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pipe
gas
gas injection
injection means
induction heating
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JP2005203206A (en
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力 宮崎
英司 鈴木
勇士 平野
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株式会社ミヤデン
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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Description

本発明は、例えば配管用フレキシブル管等の金属パイプを焼き鈍しする際に使用される高周波誘導加熱装置に関する。   The present invention relates to a high frequency induction heating apparatus used when annealing a metal pipe such as a flexible pipe for piping.

一般的に、ステンレス材で形成される配管用フレキシブル管を作製する場合、例えば管を屈曲可能なフレキシブルに作製するため、管（パイプ）を所定温度まで加熱する焼き鈍し処理が行われている。従来、この焼き鈍し処理は、バーナ等の火炎を使用してパイプを焼き鈍し温度まで加熱することによって行っている。なお、この種のフレキシブル管としては、例えば特許文献１に開示されている。
特開２００１−２６３５４７号公報 Generally, when producing a flexible pipe for piping formed of a stainless material, for example, in order to produce a flexible pipe that can be bent, an annealing process for heating the pipe (pipe) to a predetermined temperature is performed. Conventionally, this annealing treatment is performed by annealing a pipe using a flame such as a burner and heating it to a temperature. In addition, as this kind of flexible pipe | tube, it is disclosed by patent document 1, for example.
JP 2001-263547 A

しかしながら、このようなバーナを使用したパイプの焼き鈍しにあっては、単に火炎をパイプに浴びせること等により、所定温度まで加熱する方法であるため、パイプ自体の外表面の色が加熱による酸化スケール等で変化し、ステンレス材の持つ外観品質のパイプを容易に得ることが難しい。そのため、加熱後に表面研磨等の処理等が必要となり、パイプ自体の製造コストがアップし易いという問題点を有している。   However, pipe annealing using such a burner is a method of heating to a predetermined temperature by simply exposing the flame to the pipe, etc., so that the color of the outer surface of the pipe itself is an oxide scale by heating, etc. It is difficult to easily obtain a pipe with the appearance quality of stainless steel. For this reason, a process such as surface polishing is required after heating, and the manufacturing cost of the pipe itself is likely to increase.

本発明は、このような事情に鑑みてなされたもので、その目的は、表面の外観品質を良好に維持しつつ誘導加熱して焼き鈍しや焼き入れが可能な金属パイプの高周波誘導加熱装置を提供することにある。
The present invention has been made in view of such circumstances, and an object thereof is to provide a high-frequency induction heating apparatus for a metal pipe that can be annealed and quenched by induction heating while maintaining a good appearance quality of the surface. There is to do.

かかる目的を達成すべく、本発明のうち請求項１に記載の発明は、平板部及び垂直部からなりパイプを支持する基台と、該基台の垂直部に取り付けられた内部ガス噴射手段と、前記基台の垂直部で内部ガス噴射手段の反対側に配置された取付函に取り付けられた外部ガス噴射手段と、前記内部ガス噴出手段と外部ガス噴出手段との間に配置されたガスブッシュと、前記取付函内でパイプの外面側に配置された加熱コイルとを有するガス置換装置を備えた金属パイプの高周波誘導加熱装置であって、前記ガスブッシュは、樹脂により円筒部と底壁部及び開口端部を有して有底円筒形状に形成されると共にその円筒部に前記内部ガス噴出手段の噴射孔が多数形成され、該ガスブッシュに前記パイプを装着し、前記内部ガス噴射手段からパイプの内部に不活性ガスを噴射させると共に前記外部ガス噴出手段からパイプの外表面に不活性ガスを噴出させた状態で、前記加熱コイルに高周波電流を供給してパイプを所定温度まで誘導加熱して焼き鈍しもしくは焼き入れすることを特徴とする。
In order to achieve this object, the invention described in claim 1 of the present invention includes a base comprising a flat plate portion and a vertical portion and supporting a pipe, and an internal gas injection means attached to the vertical portion of the base. An external gas injection means attached to a mounting box arranged on the opposite side of the internal gas injection means in the vertical portion of the base, and a gas bush arranged between the internal gas injection means and the external gas injection means And a high-frequency induction heating device for a metal pipe having a gas displacement device having a heating coil disposed on the outer surface side of the pipe in the mounting box, wherein the gas bush is made of a resin and has a cylindrical portion and a bottom wall portion. And a cylindrical shape with a bottom having an open end, and a plurality of injection holes of the internal gas injection means are formed in the cylindrical portion, and the pipe is attached to the gas bush, from the internal gas injection means Inside the pipe Injecting the inert gas to the outer surface of the pipe from the external gas jetting means and supplying a high-frequency current to the heating coil to inductively heat the pipe to a predetermined temperature for annealing or It is characterized by quenching .

また、請求項２に記載の発明は、前記ガス置換装置が、前記基台の垂直部に設けられた取っ手により移動可能に構成されていることを特徴とする。
The invention according to claim 2 is characterized in that the gas replacement device is configured to be movable by a handle provided in a vertical portion of the base .

本発明の請求項１または２に記載の発明によれば、基台のガスブッシュに装着されたパイプの内部に内部ガス噴射手段から不活性ガスを噴射させると共に、パイプの外表面に外部ガス噴出手段から不活性ガスを噴出させた状態で、加熱コイルに高周波電流を供給してパイプを所定温度まで誘導加熱して焼き鈍しや焼き入れするため、フレキシブル管等の金属製のパイプが無酸化状態で誘導加熱され、表面に酸化スケール等による色変化が生じることがなくなり、金属が持つ特有の色を維持することができて、表面の外観品質が優れたパイプを容易に得ることができる。
According to the first or second aspect of the present invention, the inert gas is injected from the internal gas injection means into the pipe attached to the gas bush of the base, and the external gas is injected to the outer surface of the pipe. In a state where an inert gas is ejected from the means, a high-frequency current is supplied to the heating coil to inductively heat the pipe to a predetermined temperature, thereby annealing and quenching. Induction heating causes no color change due to oxide scale or the like on the surface, maintains the unique color of the metal, and makes it easy to obtain a pipe with excellent surface quality.

以下、本発明を実施するための最良の形態を図面に基づいて詳細に説明する。
図１〜図６は、本発明に係わる高周波誘導加熱装置の一実施形態を示し、図１がそのガス置換装置の斜視図、図２がその縦断面図、図３が加熱コイルの平面図、図４〜図６がガスブッシュを示す図である。 The best mode for carrying out the present invention will be described below in detail with reference to the drawings.
1 to 6 show an embodiment of a high-frequency induction heating device according to the present invention, FIG. 1 is a perspective view of the gas displacement device, FIG. 2 is a longitudinal sectional view thereof, FIG. 3 is a plan view of a heating coil, 4-6 is a figure which shows a gas bush.

本発明の高周波誘導加熱装置はガス置換装置を有し、このガス置換装置１は、図１及び図２に示すように、樹脂板により形成され平板部２ａと取っ手３を有する垂直部２ｂからなる基台２と、この基台２の垂直部２ｂに配置されたガス噴射部４と、基台２の水平部２ａ上に垂直部２ｂに向けて配置された加熱コイル５等を有している。   The high-frequency induction heating device of the present invention has a gas displacement device, and the gas displacement device 1 comprises a vertical portion 2b formed of a resin plate and having a flat plate portion 2a and a handle 3, as shown in FIGS. The base 2, the gas injection part 4 disposed on the vertical part 2 b of the base 2, and the heating coil 5 disposed on the horizontal part 2 a of the base 2 toward the vertical part 2 b are provided. .

前記ガス噴射部４は、基台２の垂直部２ｂに取付板６を介して取り付けられたユニオン７を有する内部ガス噴射部４ａと、基台２の垂直部２ｂで前記内部ガス噴射部４ａの反対側に配置された取付函８に取り付けられたユニオン９を有する外部ガス噴射部４ｂとで構成されている。また、内部ガス噴射部４ａの取付板６と外部ガス噴射部４ｂの取付函８との間には、ガスブッシュ１０が配置されている。   The gas injection part 4 includes an internal gas injection part 4a having a union 7 attached to a vertical part 2b of the base 2 via a mounting plate 6, and a vertical part 2b of the base 2 that is connected to the internal gas injection part 4a. It is comprised with the external gas injection part 4b which has the union 9 attached to the attachment box 8 arrange | positioned on the opposite side. A gas bush 10 is disposed between the mounting plate 6 of the internal gas injection unit 4a and the mounting box 8 of the external gas injection unit 4b.

このガスブッシュ１０は、図４〜図６に示すように、例えばガラスエポキシ樹脂により円筒部１０ａと底壁部１０ｂ及び開口端部１０ｃを有する有底円筒形状に形成され、開口端部１０ａには取付板６への取付孔１１が形成されると共に、前記内部ガス噴射部４ａを形成する供給孔１２が円周方向に等間隔で複数個形成されている。また、円筒部１０ａの周壁には、多数の噴射孔１３が形成されており、円筒部１０ａの内部に供給されたガスが噴射孔１３から外方に向けて噴射されるようになっている。   As shown in FIGS. 4 to 6, the gas bush 10 is formed into a bottomed cylindrical shape having a cylindrical portion 10a, a bottom wall portion 10b, and an open end portion 10c, for example, by glass epoxy resin. Attaching holes 11 to the attaching plate 6 are formed, and a plurality of supply holes 12 forming the internal gas injection part 4a are formed at equal intervals in the circumferential direction. A large number of injection holes 13 are formed in the peripheral wall of the cylindrical portion 10a, and the gas supplied to the inside of the cylindrical portion 10a is injected outward from the injection holes 13.

前記加熱コイル５は、図１〜図３に示すように、周面が絶縁処理された銅パイプを円筒形状に所定回数巻回したコイル部５ａと、このコイル部５ａの基端部がロウ付けされた銅板からなる支持板５ｂと、この支持板５ｂの端部に固定された銅板等からなる端子板５ｃ等で形成され、端子板５ｃは、基台２の水平部２ａ上を反垂直部２ｂ方向に延設されて図示しないトランジスタインバータ装置の出力端子に接続されるようになっている。なお、コイル部５ａの銅パイプの端部には、冷却水を循環供給するための給水口１５がそれぞれ設けられている。   As shown in FIGS. 1 to 3, the heating coil 5 includes a coil part 5a obtained by winding a copper pipe whose peripheral surface is insulated into a cylindrical shape a predetermined number of times, and a base end part of the coil part 5a is brazed. The support plate 5b made of a copper plate and the terminal plate 5c made of a copper plate or the like fixed to the end of the support plate 5b are formed. The terminal plate 5c is an anti-vertical portion on the horizontal portion 2a of the base 2. It extends in the 2b direction and is connected to an output terminal of a transistor inverter device (not shown). A water supply port 15 for circulating and supplying cooling water is provided at each end of the copper pipe of the coil portion 5a.

また、加熱コイル５のコイル部５ａは、基台２の垂直部２ｂに設けた孔を貫通して取付函８内に延設、つまり加熱コイル５の周囲に外部ガスが供給される空間が形成されるようになっている。そして、パイプ１４は、図２に示すように、その開口端部が加熱コイル５のコイル部５ａの内部に嵌挿されて、端部がガスブッシュ１０の開口端部１０ｃ等に当接することにより、内部ガス噴射部４ａの噴射孔１３がパイプ１４の内部に位置し、外部ガス噴射部４ｂの噴射口であるユニオン９の開口がパイプ１４の外部に位置するようになっている。   In addition, the coil portion 5 a of the heating coil 5 extends through the hole provided in the vertical portion 2 b of the base 2 into the mounting box 8, that is, a space in which external gas is supplied around the heating coil 5 is formed. It has come to be. As shown in FIG. 2, the pipe 14 is inserted into the coil part 5 a of the heating coil 5 and the end part is in contact with the opening end part 10 c of the gas bush 10. The injection hole 13 of the internal gas injection unit 4 a is located inside the pipe 14, and the opening of the union 9 that is the injection port of the external gas injection unit 4 b is located outside the pipe 14.

このガス置換装置１によれば、ワークとしての例えばフェライト系のステンレス製フレキシブル管等のパイプ１４の開口端部を、基台２のガスブッシュ１０に装着すると共に、加熱コイル５の端子板５ｃをトランジスタインバータ装置の出力端子に直接もしくはケーブルを介して接続する。また、内部ガス噴射部４ａや外部ガス噴射部４ｂのユニオン７、９に基端部がガスボンベに接続されたチューブ（いずれも図示せず）の先端部を接続する。なお、ガスとしては、アルゴンガス、窒素ガス等の不活性ガスが使用される。   According to this gas displacement device 1, the opening end of a pipe 14 such as a ferritic stainless steel flexible tube as a work is mounted on the gas bush 10 of the base 2, and the terminal plate 5 c of the heating coil 5 is attached. Connect directly or via a cable to the output terminal of the transistor inverter. Further, the distal ends of tubes (not shown) having base ends connected to gas cylinders are connected to the unions 7 and 9 of the internal gas injection unit 4a and the external gas injection unit 4b. As the gas, an inert gas such as argon gas or nitrogen gas is used.

そして、ガスボンベから内部ガス噴射部４ａと外部ガス噴射部４ｂにガスを供給しつつ、トランジスタインバータ装置から加熱コイル５に所定周波数で所定出力の高周波電流を供給する。加熱コイル５に高周波電流が供給されると、パイプ１４に渦電流が誘起されて誘導加熱され、この時、パイプ１４の加熱される部分の内部と外部の空間が共にガス置換されて無酸化状態とされていることから、誘導加熱時の酸素によって生じるスケールの発生がなくなり、誘導加熱後のパイプ１４の内外表面にステンレス材が持つ光沢ある綺麗な表面を得ることができる。   Then, while supplying gas from the gas cylinder to the internal gas injection unit 4a and the external gas injection unit 4b, a high frequency current having a predetermined output is supplied from the transistor inverter device to the heating coil 5 at a predetermined frequency. When a high-frequency current is supplied to the heating coil 5, an eddy current is induced in the pipe 14 and induction heating is performed. At this time, both the inside and the outside space of the heated portion of the pipe 14 are replaced with gas, and are in an unoxidized state. Therefore, the generation of scale caused by oxygen during induction heating is eliminated, and a glossy and beautiful surface possessed by a stainless steel material can be obtained on the inner and outer surfaces of the pipe 14 after induction heating.

トランジスタインバータ装置を所定時間作動させて、パイプ１４を所定温度（例えば９００〜１０００℃）まで加熱すると、ガスの噴射を停止させると共に、トランジスタインバータ装置の作動を停止させて、パイプ１４をガス置換装置１から外し、自然冷却することにより、パイプ１４の加熱部分が焼き鈍しされる。   When the transistor inverter device is operated for a predetermined time and the pipe 14 is heated to a predetermined temperature (for example, 900 to 1000 ° C.), the gas injection is stopped and the operation of the transistor inverter device is stopped to connect the pipe 14 to the gas replacement device. By removing from 1 and naturally cooling, the heated portion of the pipe 14 is annealed.

ところで、この例では、パイプ１４の開口端部を焼き鈍しする場合について説明したが、ガス置換装置１が取っ手３で移動できることから、例えばガス置換装置１を手動もしくはロボットで自動的に移動させつつガス置換と誘導加熱を同時に行うようにしても良く、このようにすれば、パイプ１４の長手方向に沿って焼き鈍しすることになる。   By the way, in this example, the case where the opening end of the pipe 14 is annealed has been described. However, since the gas replacement device 1 can be moved by the handle 3, for example, the gas replacement device 1 is moved manually or automatically by a robot while the gas is moved. The replacement and the induction heating may be performed at the same time, and in this way, annealing is performed along the longitudinal direction of the pipe 14.

また、この例では、パイプ１４の内外にガスを噴射できる内部ガス噴射部４ａと外部ガス噴射部４ｂを設けたが、外部ガス噴射部４ｂのみ（場合によっては内部ガス噴射部４ａのみ）を使用することも勿論可能である。   In this example, the internal gas injection unit 4a and the external gas injection unit 4b that can inject gas into and out of the pipe 14 are provided, but only the external gas injection unit 4b (in some cases, only the internal gas injection unit 4a) is used. Of course, it is also possible.

本発明は、フレキシブル管の焼き鈍し処理に限らず、焼き入れ処理等の誘導加熱作業にも適用できるし、フレキシブル管に限らず、他の全ての金属パイプにも適用できる。   The present invention can be applied not only to annealing of a flexible tube but also to induction heating work such as quenching, and is also applicable to all other metal pipes as well as the flexible tube.

本発明に係わる金属パイプの高周波誘導加熱装置の一実施形態を示すガス置換装置の斜視図The perspective view of the gas displacement apparatus which shows one Embodiment of the high frequency induction heating apparatus of the metal pipe concerning this invention 同その縦断面図The longitudinal section 同加熱コイルの平面図Top view of the heating coil 同ガスブッシュを示す平面図Plan view showing the gas bush 同その縦断面図The longitudinal section 同図５のＡ−Ａ線に沿った断面図Sectional view along the AA line of FIG.

符号の説明Explanation of symbols

１・・・ガス置換装置、２・・・基台、２ａ・・・水平部、２ｂ・・・垂直部、３・・・取っ手、４・・・ガス噴射部、４ａ・・・内部ガス噴射部、４ｂ・・・外部ガス噴射部、５・・・加熱コイル、５ａ・・・コイル部、５ｂ・・・支持板、５ｃ・・・端子板、６・・・取付板、７・・・ユニオン、８・・・取付函、９・・・ユニオン、１０・・・ガスブッシュ、１２・・・供給孔、１３・・・噴射孔、１４・・・パイプ。   DESCRIPTION OF SYMBOLS 1 ... Gas displacement apparatus, 2 ... Base, 2a ... Horizontal part, 2b ... Vertical part, 3 ... Handle, 4 ... Gas injection part, 4a ... Internal gas injection Part, 4b ... external gas injection part, 5 ... heating coil, 5a ... coil part, 5b ... support plate, 5c ... terminal plate, 6 ... mounting plate, 7 ... Union, 8 ... Mounting box, 9 ... Union, 10 ... Gas bush, 12 ... Supply hole, 13 ... Injection hole, 14 ... Pipe.

Claims (2)

平板部及び垂直部からなりパイプを支持する基台と、該基台の垂直部に取り付けられた内部ガス噴射手段と、前記基台の垂直部で内部ガス噴射手段の反対側に配置された取付函に取り付けられた外部ガス噴射手段と、前記内部ガス噴出手段と外部ガス噴出手段との間に配置されたガスブッシュと、前記取付函内でパイプの外面側に配置された加熱コイルとを有するガス置換装置を備えた金属パイプの高周波誘導加熱装置であって、
前記ガスブッシュは、樹脂により円筒部と底壁部及び開口端部を有して有底円筒形状に形成されると共にその円筒部に前記内部ガス噴出手段の噴射孔が多数形成され、該ガスブッシュに前記パイプを装着し、前記内部ガス噴射手段からパイプの内部に不活性ガスを噴射させると共に前記外部ガス噴出手段からパイプの外表面に不活性ガスを噴出させた状態で、前記加熱コイルに高周波電流を供給してパイプを所定温度まで誘導加熱して焼き鈍しもしくは焼き入れすることを特徴とする金属パイプの高周波誘導加熱装置。 A base comprising a flat plate portion and a vertical portion and supporting the pipe, an internal gas injection means attached to the vertical portion of the base, and an installation arranged on the opposite side of the internal gas injection means in the vertical portion of the base An external gas injection means attached to the box; a gas bush arranged between the internal gas injection means and the external gas injection means; and a heating coil arranged on the outer surface side of the pipe in the attachment box. A high frequency induction heating device for a metal pipe provided with a gas replacement device,
The gas bush has a cylindrical portion, a bottom wall portion, and an opening end portion made of resin and is formed into a bottomed cylindrical shape, and a plurality of injection holes of the internal gas ejection means are formed in the cylindrical portion. The pipe is attached to the pipe, and an inert gas is injected into the pipe from the internal gas injection means and an inert gas is injected from the external gas injection means to the outer surface of the pipe. A high frequency induction heating apparatus for a metal pipe, characterized in that an electric current is supplied and the pipe is induction heated to a predetermined temperature to be annealed or quenched . 前記ガス置換装置は、前記基台の垂直部に設けられた取っ手により移動可能に構成されていることを特徴とする請求項１に記載の金属パイプの高周波誘導加熱装置。
The high-frequency induction heating apparatus for a metal pipe according to claim 1, wherein the gas replacement device is configured to be movable by a handle provided in a vertical portion of the base .
JP2004007431A 2004-01-15 2004-01-15 High frequency induction heating equipment for metal pipes Expired - Fee Related JP4232963B2 (en)

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JP2010024515A (en) * 2008-07-23 2010-02-04 Fuji Electronics Industry Co Ltd Induction heating device
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