JPH11329673A - Inner surface heating coil for tubular work - Google Patents

Inner surface heating coil for tubular work

Info

Publication number
JPH11329673A
JPH11329673A JP10152091A JP15209198A JPH11329673A JP H11329673 A JPH11329673 A JP H11329673A JP 10152091 A JP10152091 A JP 10152091A JP 15209198 A JP15209198 A JP 15209198A JP H11329673 A JPH11329673 A JP H11329673A
Authority
JP
Japan
Prior art keywords
heating
heating coil
cylindrical work
parts
groove
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP10152091A
Other languages
Japanese (ja)
Inventor
Hiyoshi Watanabe
日吉 渡邊
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fuji Electronics Industry Co Ltd
Original Assignee
Fuji Electronics Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fuji Electronics Industry Co Ltd filed Critical Fuji Electronics Industry Co Ltd
Priority to JP10152091A priority Critical patent/JPH11329673A/en
Publication of JPH11329673A publication Critical patent/JPH11329673A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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  • Resistance Heating (AREA)

Abstract

PROBLEM TO BE SOLVED: To uniformize the depth of a hardened layer when an inner surface of a tubular work is quenched, and resultantly, eliminate a problem on strength and prevent distortion. SOLUTION: A tubular work inner surface heater coil for heating side surface parts WT1 of groove parts WT in an inner surface of a triport cup W as a tubular work, is equipped with three heating conductor parts 100A, 100B, 100C confronting the side surface parts WT1 or surfaces to be heated, and the heating conductor parts 100A, 100B, 100C have, on their upper-side end parts, projection parts 111A, 111B, 111C, respectively, projecting to the side of the side surface parts WT1.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、筒状ワーク、例え
ば等速ジョイントのトリポートカップの内面を加熱する
筒状ワークの内面加熱コイルに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inner surface heating coil for a cylindrical work, for example, for heating the inner surface of a tripod cup of a constant velocity joint.

【０００２】[0002]

【従来の技術】従来のこの種の筒状ワークの内面加熱コ
イルを図６〜図７を参照しつつ説明する。また、筒状ワ
ークとして、内面に３つの溝部ＷＴが等間隔、すなわち
１２０°間隔で設けられた等速ジョイントのトリポート
カップＷ（図６参照）を例に挙げる。この種のトリポー
トカップＷでは、溝部ＷＴの側面部ＷＴ１に高周波焼入
を施す必要があり、直列に接続された３つの略門字形状
の加熱導体部１００Ａ、１００Ｂ、１００Ｃが形成され
た内面加熱コイルが用いられる。加熱導体部１００Ａ、
１００Ｂ、１００Ｃは、溝部ＷＴの各部とのギャップが
一定になるように溝部ＷＴに嵌まり込む。2. Description of the Related Art A conventional inner surface heating coil for a cylindrical work will be described with reference to FIGS. In addition, as a cylindrical work, a tripod cup W (see FIG. 6) of a constant velocity joint in which three groove portions WT are provided at equal intervals on the inner surface, that is, at 120 ° intervals, is exemplified. In this type of tripod cup W, it is necessary to perform induction hardening on the side surface portion WT1 of the groove portion WT, and the inner surface on which three substantially gate-shaped heating conductor portions 100A, 100B, and 100C connected in series are formed. A heating coil is used. Heating conductor 100A,
100B and 100C fit into the groove WT such that the gap between the groove WT and each part is constant.

【０００３】この内面加熱コイルは、加熱導体部１００
Ａ、１００Ｂ、１００ＣがトリポートカップＷに嵌まり
込んだ状態で高周波電流が供給され、溝部ＷＴの側面部
ＷＴ１を加熱する。その後、加熱された側面部ＷＴ１に
冷却液を噴射することで側面部ＷＴ１に、図７に示すよ
うな硬化層ＷＡを形成する。[0003] The inner surface heating coil comprises a heating conductor 100.
A, 100B, and 100C are fitted in the tripod cup W, and a high-frequency current is supplied to heat the side surface WT1 of the groove WT. Thereafter, a hardened layer WA as shown in FIG. 7 is formed on the side surface portion WT1 by injecting a cooling liquid onto the heated side surface portion WT1.

【０００４】[0004]

【発明が解決しようとする課題】ここで、溝部ＷＴの側
面部ＷＴ１に形成される硬化層ＷＡは深さが均一である
ことが要求される。しかしながら、内面加熱コイルの加
熱導体部１００Ａ、１００Ｂ、１００Ｃと溝部ＷＴの側
面部ＷＴ１とのギャップが一定であると、図７に示すよ
うに端部、特に上側の端部に対向する部分の硬化層ＷＡ
が浅くなる傾向がある。これは、中央部の誘導電流の電
流密度が上側の端部における電流密度より高くなること
に起因している。なお、下側の端部には、コンセントリ
ング８００があるため、硬化層ＷＡは深くなる傾向にあ
るが、コンセントリング８００によって硬化層ＷＡのパ
ターンをコントロールしている。Here, the hardened layer WA formed on the side surface portion WT1 of the groove portion WT is required to have a uniform depth. However, if the gap between the heating conductor portions 100A, 100B, and 100C of the inner surface heating coil and the side surface portion WT1 of the groove portion WT is constant, as shown in FIG. Layer WA
Tend to be shallow. This is due to the fact that the current density of the induced current at the center becomes higher than the current density at the upper end. The hardened layer WA tends to be deeper due to the presence of the concentric ring 800 at the lower end, but the pattern of the hardened layer WA is controlled by the concentric ring 800.

【０００５】硬化層ＷＡの深さが均一でないと、歪み、
特に円筒度の面から問題がある。また、強度の面からも
両端いっぱいまでベアリングが当たるような場合には問
題となる。If the depth of the hardened layer WA is not uniform, distortion,
In particular, there is a problem in terms of cylindricity. In addition, there is a problem in the case where the bearings hit the entire ends from the viewpoint of strength.

【０００６】本発明は上記事情に鑑みて創案されたもの
で、本発明は筒状ワークの内面に焼入を施しても硬化層
の深さが均一になり、その結果、強度的な問題もなく、
しかも歪みも生じない筒状ワークの内面加熱コイルを提
供することを目的としている。The present invention has been made in view of the above circumstances, and the present invention makes the depth of the hardened layer uniform even when quenching the inner surface of the cylindrical work, and as a result, there is also a problem in strength. Not
Moreover, it is an object of the present invention to provide an inner surface heating coil for a cylindrical work that does not cause distortion.

【０００７】[0007]

【課題を解決するための手段】本発明に係る筒状ワーク
の内面加熱コイルは、筒状ワークの内面を加熱する筒状
ワークの内面加熱コイルであって、加熱すべき被加熱面
に対向する加熱導体部を具備しており、当該加熱導体部
は、端部に被加熱面側に突出する突出部を有している。An inner surface heating coil of a cylindrical work according to the present invention is an inner surface heating coil of a cylindrical work for heating an inner surface of the cylindrical work, and is opposed to a surface to be heated to be heated. A heating conductor is provided, and the heating conductor has a protruding portion that protrudes toward the surface to be heated at an end.

【０００８】[0008]

【発明の実施の形態】図１は本発明の第１の実施の形態
に係る筒状ワークの内面加熱コイルの概略的斜視図、図
２は本発明の第１の実施の形態に係る筒状ワークの内面
加熱コイルと筒状ワークとしてのトリポートカップの溝
部との関係を示す概略的断面図、図３は本発明の第１の
実施の形態に係る筒状ワークの内面加熱コイルの要部の
概略的断面図、図４は本発明の第２の実施の形態に係る
筒状ワークの内面加熱コイルの概略的斜視図、図５は本
発明の第３の実施の形態に係る筒状ワークの内面加熱コ
イルの概略的斜視図である。FIG. 1 is a schematic perspective view of an inner surface heating coil of a cylindrical work according to a first embodiment of the present invention, and FIG. 2 is a cylindrical view according to the first embodiment of the present invention. FIG. 3 is a schematic cross-sectional view showing a relationship between an inner surface heating coil of a work and a groove portion of a tripod cup as a cylindrical work. FIG. 3 is a main part of the inner surface heating coil of the cylindrical work according to the first embodiment of the present invention. FIG. 4 is a schematic perspective view of an inner surface heating coil of a cylindrical work according to a second embodiment of the present invention, and FIG. 5 is a cylindrical work according to a third embodiment of the present invention. It is a schematic perspective view of the inner surface heating coil of FIG.

【０００９】本発明の第１の実施の形態に係る筒状ワー
クの内面加熱コイルは、筒状ワークとしてのトリポート
カップＷの内面の溝部ＷＴの側面部ＷＴ１を加熱する筒
状ワークの内面加熱コイルであって、加熱すべき被加熱
面である側面部ＷＴ１に対向する３つの加熱導体部１０
０Ａ、１００Ｂ、１００Ｃを備えており、当該加熱導体
部１００Ａ、１００Ｂ、１００Ｃは、上側の端部に側面
部ＷＴ１側に突出する突出部１１１Ａ、１１１Ｂ、１１
１Ｃを有している。The inner surface heating coil of the cylindrical work according to the first embodiment of the present invention is configured to heat the inner surface of the cylindrical work for heating the side surface portion WT1 of the groove WT on the inner surface of the tripod cup W as the cylindrical work. Three heating conductor portions 10 which are coils and face side portions WT1 which are surfaces to be heated;
0A, 100B, and 100C, and the heating conductors 100A, 100B, and 100C have protrusions 111A, 111B, and 11 that project toward the side surface WT1 at the upper end.
1C.

【００１０】この内面加熱コイルは、一発焼きコイルと
称されるものであって、３つの略門字形状の加熱導体部
１００Ａ、１００Ｂ、１００Ｃは、溝部ＷＴに嵌まり込
むようになっている。また、この内面加熱コイルは、前
記加熱導体部１００Ａ、１００Ｂ、１００Ｃを図外の高
周波電源に対して直列に接続する一対の接続導体部２０
０を備えている。This inner surface heating coil is called a one-shot firing coil, and three substantially gate-shaped heating conductor portions 100A, 100B, and 100C fit into the groove portion WT. . The inner surface heating coil includes a pair of connecting conductors 20 that connect the heating conductors 100A, 100B, and 100C in series to a high-frequency power source (not shown).
0 is provided.

【００１１】３つの加熱導体部１００Ａ、１００Ｂ、１
００Ｃは、形状が同一なので、代表として加熱導体部１
００Ａを挙げる。加熱導体部１００Ａは、銅製の角パイ
プを溝部ＷＴの形状に対応させて折曲形成したものであ
り、溝部ＷＴの両側の側面部ＷＴ１を加熱する垂直にな
った一対の垂直加熱部１１０Ａと、この垂直加熱部１１
０Ａを上端で連結する水平になった水平加熱部１２０Ａ
とを有している。The three heating conductors 100A, 100B, 1
Since 00C has the same shape, the heating conductor 1
00A. The heating conductor portion 100A is formed by bending a copper square pipe in accordance with the shape of the groove portion WT, and a pair of vertical heating portions 110A that become vertical to heat the side portions WT1 on both sides of the groove portion WT. This vertical heating unit 11
Horizontal heating section 120A connecting 0A at the upper end
And

【００１２】そして、垂直加熱部１１０Ａの上端の側面
（溝部ＷＴの側面部ＷＴ１と対向する面）には、外側に
向かって突出した突出部１１１Ａが形成されている。こ
の突出部１１１Ａは、図３に示すように、垂直加熱部１
１０Ａの突出部１１１Ａ以外の部分を切削することによ
って突出させている。A protrusion 111A protruding outward is formed on the side surface at the upper end of the vertical heating portion 110A (the surface facing the side surface portion WT1 of the groove WT). As shown in FIG. 3, the protrusion 111 </ b> A
The portion other than the protruding portion 111A of the 10A is made to protrude by cutting.

【００１３】図２に示すように、垂直加熱部１１０Ａの
長さ寸法をＨとすれば、突出部１１１Ａの長さ寸法ｈ＝
Ｈ（１／４〜１／８）であるのが望ましい。また、この
突出部１１１Ａと側面部ＷＴ１との間のギャップをＧと
すれば、突出部１１１Ａがない部分と側面部ＷＴ１との
間のギャップｇ−Ｇ＝０．５〜１．５ミリとなるのが望
ましい。すなわち、突出部１１１Ａの突出寸法は、０．
５ミリから１．５ミリの間が望ましいのである。なお、
これらの各部の寸法の関係は、実験によって求めた。As shown in FIG. 2, if the length of the vertical heating portion 110A is H, the length h of the protrusion 111A is h = H.
H (１ ／ to １ ／) is desirable. If the gap between the protrusion 111A and the side surface WT1 is G, the gap g-G between the portion without the protrusion 111A and the side surface WT1 is 0.5 to 1.5 mm. It is desirable. That is, the protrusion dimension of the protrusion 111A is 0.1 mm.
Preferably between 5 and 1.5 mm. In addition,
The relationship between the dimensions of these parts was determined by experiments.

【００１４】このように構成された内面加熱コイルは、
一方の接続導体部２００→加熱導体部１００Ａ（一方の
垂直加熱部１１０Ａ→水平加熱部１２０Ａ→他方の垂直
加熱部１１０Ａ）→加熱導体部１００Ｂ（一方の垂直加
熱部１１０Ｂ→水平加熱部１２０Ｂ→他方の垂直加熱部
１１０Ｂ）→加熱導体部１００Ｃ（一方の垂直加熱部１
１０Ｃ→水平加熱部１２０Ｃ→他方の垂直加熱部１１０
Ｃ）→他方の接続導体部２００、の順及びその逆で高周
波電流が流れる。The inner surface heating coil configured as described above is
One connecting conductor part 200 → heating conductor part 100A (one vertical heating part 110A → horizontal heating part 120A → the other vertical heating part 110A) → heating conductor part 100B (one vertical heating part 110B → horizontal heating part 120B → the other) Vertical heating section 110B) → heating conductor section 100C (one vertical heating section 1B)
10C → horizontal heating section 120C → the other vertical heating section 110
C) A high-frequency current flows in the order of the other connection conductor 200 and vice versa.

【００１５】かかる内面加熱コイルは、自身の過熱を防
止するため、内部に冷却液を循環させる冷却系統を有し
ている。[0015] Such an inner surface heating coil has a cooling system for circulating a cooling liquid inside in order to prevent overheating of itself.

【００１６】この内面加熱コイルには、加熱されたワー
クであるトリポートカップＷを冷却する冷却液を噴射す
る冷却ジャケット６００が併設される。The inner surface heating coil is provided with a cooling jacket 600 for spraying a cooling liquid for cooling the tripod cup W which is a heated work.

【００１７】次に、上述した内面加熱コイルによるトリ
ポートカップＷの高周波焼入について説明する。まず、
この内面加熱コイルは、図２に示すように、コンセント
リングを兼ねた支持台８００の開口部８１０に挿入され
ているものとする。従って、この内面加熱コイルは、３
つの加熱導体部１００Ａ、１００Ｂ、１００Ｂが支持台
８００の上方に位置しているものとする（ただし、図２
には加熱導体部１００Ｂ、１００Ｂは示されていな
い）。Next, induction hardening of the tripod cup W by the above-described inner surface heating coil will be described. First,
As shown in FIG. 2, the inner surface heating coil is inserted into an opening 810 of the support base 800 which also serves as an outlet ring. Therefore, this inner surface heating coil has 3
It is assumed that the two heating conductor portions 100A, 100B, 100B are located above the support base 800 (however, FIG.
Do not show the heating conductor portions 100B, 100B).

【００１８】トリポートカップＷを開放側を下向きにし
て支持台８００に載置する。すると、トリポートカップ
Ｗの溝部ＷＴには、内面加熱コイルの３つの加熱導体部
１００Ａ、１００Ｂ、１００Ｂが挿入されることにな
る。The tripod cup W is placed on the support base 800 with the open side facing downward. Then, the three heating conductors 100A, 100B, 100B of the inner surface heating coil are inserted into the groove WT of the tripod cup W.

【００１９】この状態で、内面加熱コイルへの高周波電
流の供給を行う。すると、突出部１１１Ａ、１１１Ｂ、
１１１Ｃは他の部分より溝部ＷＴの側面部ＷＴ１に近く
なっているので、突出部１１１Ａ、１１１Ｂ、１１１Ｃ
と対向する部分における誘導電流の電流密度は、突出部
１１１Ａ、１１１Ｂ、１１１Ｃが設けられていない場合
（従来の場合）より高くなる。In this state, a high-frequency current is supplied to the inner surface heating coil. Then, the protruding portions 111A, 111B,
Since 111C is closer to the side surface WT1 of the groove WT than the other portions, the protrusions 111A, 111B, 111C
The current density of the induced current in the portion opposite to the above becomes higher than when the protrusions 111A, 111B, and 111C are not provided (in the conventional case).

【００２０】従って、側面部ＷＴ１の上側の端部と、中
央部との電流密度がほぼ等しくなり、誘導電流によって
加熱される深さがほぼ等しくなる。Therefore, the current density at the upper end of the side portion WT1 and the current density at the central portion are substantially equal, and the depth heated by the induced current is substantially equal.

【００２１】加熱が終了したならば、冷却ジャケット６
００からの冷却液の噴射を行って、溝部ＷＴの側面部Ｗ
Ｔ１を冷却し硬化層ＷＡを形成する。When the heating is completed, the cooling jacket 6
00, the side surface W of the groove WT is sprayed.
T1 is cooled to form a hardened layer WA.

【００２２】上述した実施の形態では、加熱導体部１０
０Ａ、１００Ｂ、１００Ｃの垂直加熱部１１０Ａ、１１
０Ｂ、１１０Ｃの上側の端部にのみ突出部１１１Ａ、１
１１Ｂ、１１１Ｃを形成したが、本発明がこれに限定さ
れるものではない。例えば、図４に示すように、下側の
端部に突出部１１２Ａ、１１２Ｂ、１１２Ｃを形成して
もよい。一般的に、筒状ワークとしてのトリポートカッ
プＷはコンセントリング（支持台８００が兼用する）に
載置されるため、下側には突出部１１２Ａ、１１２Ｂ、
１１２Ｃを形成しなくてもよいが、端部まで焼入されな
い仕様であれば下側の端部に突出部１１２Ａ、１１２
Ｂ、１１２Ｃを設けることによって硬化層ＷＡの厚さを
均一にすることも可能となる。In the above-described embodiment, the heating conductor 10
0A, 100B, 100C vertical heating units 110A, 11
0B, 110C, projecting portions 111A, 1
Although 11B and 111C were formed, the present invention is not limited to this. For example, as shown in FIG. 4, projecting portions 112A, 112B, 112C may be formed at the lower end. In general, the tripod cup W as a cylindrical work is placed on an outlet ring (also used by the support base 800), so that the protrusions 112A, 112B,
It is not necessary to form 112C, but if it is a specification that does not harden to the end, the protrusions 112A, 112
By providing B and 112C, the thickness of the cured layer WA can be made uniform.

【００２３】また、上述した実施の形態では、溝部ＷＴ
の両側の側面部ＷＴ１のみを加熱して硬化層ＷＡを形成
するとしたが、溝部ＷＴの底面部ＷＴ２（図６参照）を
も加熱してこの部分にも硬化層ＷＡを形成することがあ
る。この場合には、図５に示すように、垂直加熱部１１
０Ａ、１１０Ｂ、１１０Ｂの上端の側面（溝部ＷＴの側
面部ＷＴ１と対向する面）のみならず、上端の前面（溝
部ＷＴの底面部ＷＴ２と対向する面）にも突出部１１３
Ａ、１１３Ｂ、１１３Ｂを形成する。In the above-described embodiment, the groove WT
Although the hardened layer WA is formed by heating only the side portions WT1 on both sides of the groove WT, the hardened layer WA may also be formed on this portion by heating the bottom portion WT2 (see FIG. 6) of the groove WT. In this case, as shown in FIG.
The protruding portions 113 are formed not only on the upper side surfaces (surfaces facing the side surface portions WT1 of the groove portions WT) of the upper ends of the grooves 0A, 110B, and 110B, but also on the front surface on the upper end portions (surfaces facing the bottom surface portion WT2 of the groove portions WT).
A, 113B and 113B are formed.

【００２４】また、垂直加熱部１１０Ａ、１１０Ｂ、１
１０Ｃの下側の端部の前面（溝部ＷＴの底面部ＷＴ２と
対向する面）にも突出部を形成してもよい。The vertical heating units 110A, 110B, 1
A projection may also be formed on the front surface of the lower end of 10C (the surface facing the bottom surface WT2 of the groove WT).

【００２５】[0025]

【発明の効果】本発明に係る筒状ワークの内面加熱コイ
ルは、筒状ワークの内面を加熱する筒状ワークの内面加
熱コイルであって、加熱すべき被加熱面に対向する加熱
導体部を具備しており、当該加熱導体部は、端部に被加
熱面側に突出する突出部を有している。The inner surface heating coil of the cylindrical work according to the present invention is an inner surface heating coil of the cylindrical work for heating the inner surface of the cylindrical work, and has a heating conductor portion facing the surface to be heated. The heating conductor has a protruding portion at the end protruding toward the surface to be heated.

【００２６】このため、筒状ワークの内面に焼入を施し
ても硬化層の深さが均一になり、その結果、強度的な問
題もなく、しかも歪みも生じないようになる。すなわ
ち、突出部が設けると、突出部を設けない場合より誘導
電流の電流密度が高くなるので、全体の電流密度がほぼ
等しくなり、その結果、誘導電流によって加熱される深
さがほぼ等しくなり、均一な硬化層が形成されるのであ
る。均一な硬化層は、強度的な面からも問題がなく、歪
みも生じないのである。For this reason, even if the inner surface of the cylindrical work is quenched, the depth of the hardened layer becomes uniform, and as a result, there is no problem in strength and no distortion occurs. That is, when the protrusion is provided, the current density of the induced current is higher than when the protrusion is not provided, so that the entire current density is substantially equal, and as a result, the depth heated by the induced current is substantially equal, A uniform cured layer is formed. A uniform cured layer has no problem in terms of strength, and does not cause distortion.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の第１の実施の形態に係る筒状ワークの
内面加熱コイルの概略的斜視図である。FIG. 1 is a schematic perspective view of an inner surface heating coil of a cylindrical work according to a first embodiment of the present invention.

【図２】本発明の第１の実施の形態に係る筒状ワークの
内面加熱コイルと筒状ワークとしてのトリポートカップ
の溝部との関係を示す概略的断面図である。FIG. 2 is a schematic cross-sectional view illustrating a relationship between an inner surface heating coil of the cylindrical work and a groove of a tripod cup as the cylindrical work according to the first embodiment of the present invention.

【図３】本発明の第１の実施の形態に係る筒状ワークの
内面加熱コイルの要部の概略的断面図である。FIG. 3 is a schematic sectional view of a main part of an inner surface heating coil of the cylindrical work according to the first embodiment of the present invention.

【図４】本発明の第２の実施の形態に係る筒状ワークの
内面加熱コイルの概略的斜視図である。FIG. 4 is a schematic perspective view of an inner surface heating coil of a cylindrical work according to a second embodiment of the present invention.

【図５】本発明の第３の実施の形態に係る筒状ワークの
内面加熱コイルの概略的斜視図である。FIG. 5 is a schematic perspective view of an inner surface heating coil of a cylindrical work according to a third embodiment of the present invention.

【図６】筒状ワークの内面加熱コイルにより加熱される
ワークの一種である等速ジョイントのトリポートカップ
の概略的断面図である。FIG. 6 is a schematic sectional view of a tripod cup of a constant velocity joint, which is a kind of a work heated by an inner surface heating coil of a cylindrical work.

【図７】従来の筒状ワークの内面加熱コイルの問題点を
示す概略的断面図である。FIG. 7 is a schematic sectional view showing a problem of a conventional inner surface heating coil of a cylindrical work.

【符号の説明】[Explanation of symbols]

１００Ａ、１００Ｂ、１００Ｃ 加熱導体部 １１１Ａ、１１１Ｂ １１１Ｃ 突出部 Ｗ トリポートカップ（筒状ワーク） ＷＴ１ 側面部（被加熱面） 100A, 100B, 100C Heating conductor 111A, 111B 111C Projection W Triport cup (tubular work) WT1 Side (surface to be heated)

Claims (1)

【特許請求の範囲】[Claims] 【請求項１】 筒状ワークの内面を加熱する筒状ワーク
の内面加熱コイルであって、加熱すべき被加熱面に対向
する加熱導体部を具備しており、当該加熱導体部は、端
部に被加熱面側に突出する突出部を有していることを特
徴とする筒状ワークの内面加熱コイル。An inner surface heating coil of a cylindrical work for heating an inner surface of the cylindrical work, comprising a heating conductor facing a surface to be heated, wherein the heating conductor has an end portion. An inner surface heating coil for a cylindrical work, wherein the inner surface heating coil has a protruding portion protruding toward the surface to be heated.
JP10152091A 1998-05-15 1998-05-15 Inner surface heating coil for tubular work Pending JPH11329673A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10152091A JPH11329673A (en) 1998-05-15 1998-05-15 Inner surface heating coil for tubular work

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10152091A JPH11329673A (en) 1998-05-15 1998-05-15 Inner surface heating coil for tubular work

Publications (1)

Publication Number Publication Date
JPH11329673A true JPH11329673A (en) 1999-11-30

Family

ID=15532858

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10152091A Pending JPH11329673A (en) 1998-05-15 1998-05-15 Inner surface heating coil for tubular work

Country Status (1)

Country Link
JP (1) JPH11329673A (en)

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