JP6057329B2 - Rack bar induction hardening equipment - Google Patents

Rack bar induction hardening equipment Download PDF

Info

Publication number
JP6057329B2
JP6057329B2 JP2013003471A JP2013003471A JP6057329B2 JP 6057329 B2 JP6057329 B2 JP 6057329B2 JP 2013003471 A JP2013003471 A JP 2013003471A JP 2013003471 A JP2013003471 A JP 2013003471A JP 6057329 B2 JP6057329 B2 JP 6057329B2
Authority
JP
Japan
Prior art keywords
rack bar
back surface
heating coil
tooth surface
tooth
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.)
Active
Application number
JP2013003471A
Other languages
Japanese (ja)
Other versions
JP2014133929A (en
Inventor
宮崎　力
力 宮崎
Original Assignee
株式会社ミヤデン
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 株式会社ミヤデン filed Critical 株式会社ミヤデン
Priority to JP2013003471A priority Critical patent/JP6057329B2/en
Publication of JP2014133929A publication Critical patent/JP2014133929A/en
Application granted granted Critical
Publication of JP6057329B2 publication Critical patent/JP6057329B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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

Landscapes

  • General Induction Heating (AREA)
  • Heat Treatment Of Articles (AREA)

Description

本発明は、ラックバーを垂直方向（縦方向）に移動させつつ、その歯面と背面を高周波の誘導加熱を利用して焼入するためのラックバーの高周波焼入装置に関する。   The present invention relates to an induction hardening apparatus for a rack bar for moving the rack bar in a vertical direction (longitudinal direction) and hardening the tooth surface and the back surface thereof using high frequency induction heating.

従来、ラックバーの歯面や背面を焼入する場合、通電加熱を利用した焼入装置と誘導加熱を利用した焼入装置が使用されている。このうち、通電加熱を利用した焼入装置は、一対の電極と冷却ジャケット等を有し、電極をラックバーの背面に接触させて高周波電流を通電して背面を所定温度まで加熱し、この加熱後に冷却ジャケットから冷却水を噴射して背面を急速冷却することで背面を焼入し、この背面の焼入後にラックバーを回転させて歯面に電極を接触させ、背面と同様に通電加熱及び急速冷却することで歯面を焼入するようにしている。   Conventionally, when quenching the tooth surface and back surface of a rack bar, a quenching device using current heating and a quenching device using induction heating are used. Among these, the quenching apparatus using current heating has a pair of electrodes and a cooling jacket, etc., and the electrodes are brought into contact with the back surface of the rack bar so that a high frequency current is applied to heat the back surface to a predetermined temperature. Later, the back surface is quenched by jetting cooling water from the cooling jacket to quench the back surface, and after quenching the back surface, the rack bar is rotated to bring the electrode into contact with the tooth surface. The tooth surface is hardened by rapid cooling.

また、誘導加熱を利用した焼入装置（縦型移動焼入装置）は、図５に示すように、ラックバーＷを縦方向（矢印イ方向）に移動可能に支持し、高周波発振機２１にカレントトランス２２を介して接続された加熱コイル２３と、冷却水を噴射可能な噴射筒２４とを所定位置に配置し、加熱コイル２３に高周波電流を供給してラックバーＷの歯面Ｗａと背面Ｗｂを誘導加熱し、この誘導加熱した歯面Ｗａと背面Ｗｂに冷却水を噴射して急速冷却することで、ラックバーＷを縦方向に移動させつつその歯面Ｗａと背面Ｗｂを同時に焼入するようになっている。なお、ラックバーの焼入装置としては、例えば特許文献１に開示されている。   Further, as shown in FIG. 5, the quenching apparatus (vertical moving quenching apparatus) using induction heating supports the rack bar W so as to be movable in the vertical direction (in the direction of arrow A). A heating coil 23 connected via a current transformer 22 and an injection cylinder 24 capable of injecting cooling water are arranged at predetermined positions, and a high-frequency current is supplied to the heating coil 23 to provide a tooth surface Wa and a rear surface of the rack bar W. Wb is induction-heated, and cooling water is jetted onto the induction-heated tooth surface Wa and back surface Wb to rapidly cool, thereby simultaneously quenching the tooth surface Wa and back surface Wb while moving the rack bar W in the vertical direction. It is supposed to be. A rack bar quenching device is disclosed in, for example, Patent Document 1.

特許第４２３２９７３号公報Japanese Patent No. 42322973

しかしながら、前者の焼入装置にあっては、歯面と背面を焼入するために２つの工程が必要となって、焼入作業の作業性が劣る。この点、後者の縦型移動焼入装置にあっては、ラックバーを縦方向に移動させつつ歯面と背面を同時に焼入できるため、焼入作業の作業性を向上させることができる。しかし、この縦型移動焼入装置の場合、図６に示すように、一つの加熱コイル２３を、ラックバーＷの歯面Ｗａ、背面Ｗｂ及び両側面Ｗｃからなる外周面の全域を囲むように配置して誘導加熱するため、歯面Ｗａと背面Ｗｂ間の両側面Ｗｃも誘導加熱された状態となり、図７（ａ）（ｂ）に示すように、歯面Ｗａ側の焼入層Ｋａと背面Ｗｂ側の焼入層Ｋｂとが両側面Ｗｃ部分の焼入層Ｋｃでつながってしまい、歯面Ｗａと背面Ｗｂのみを精度良く焼入することが困難である。   However, in the former quenching apparatus, two steps are required to quench the tooth surface and the back surface, and the workability of the quenching work is inferior. In this respect, in the latter vertical moving quenching apparatus, the tooth surface and the back surface can be quenched simultaneously while moving the rack bar in the vertical direction, so that the workability of the quenching operation can be improved. However, in the case of this vertical moving quenching apparatus, as shown in FIG. 6, one heating coil 23 is surrounded by the entire outer peripheral surface composed of the tooth surface Wa, the back surface Wb, and both side surfaces Wc of the rack bar W. Since it is arranged and induction-heated, both side surfaces Wc between the tooth surface Wa and the back surface Wb are also induction-heated, and as shown in FIGS. 7 (a) and 7 (b), the quenching layer Ka on the tooth surface Wa side and The hardened layer Kb on the back surface Wb side is connected by the hardened layer Kc on both side surfaces Wc, and it is difficult to harden only the tooth surface Wa and the back surface Wb with high accuracy.

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、縦方向に配置されるラックバーの歯面と背面に加熱コイルをそれぞれ独立した状態で配置することにより、歯面と背面のみを高精度に焼入できるラックバーの高周波焼入装置を提供することにある。   The present invention has been made in view of such circumstances, and the object thereof is to provide a tooth surface by arranging heating coils on the tooth surface and the back surface of the rack bar arranged in the vertical direction independently of each other. An object of the present invention is to provide an induction hardening apparatus for a rack bar that can harden only the back surface with high accuracy.

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、ラックバーの歯面及び背面に所定の隙間を有して独立した状態で配置される歯面用加熱コイル及び背面用加熱コイルと、二次側に前記両加熱コイルが接続されると共に一次側に高周波発振機が接続されたカレントトランスと、前記ラックバーの歯面及び背面に対向配置された噴射筒から冷却媒体を噴射させる冷却媒体供給装置と、を備え、前記歯面用加熱コイル及び背面用加熱コイルとラックバーとの相対的位置関係を垂直方向で変化させつつ、前記高周波発振機からカレントトランスを介して前記両加熱コイルにそれぞれ所定の高周波電流を同時に供給すると共に、前記冷却媒体供給装置を作動させて前記噴射筒から冷却媒体をラックバーの歯面と背面に同時に噴射させることを特徴とする。   In order to achieve such an object, the invention described in claim 1 of the present invention is a heating coil for tooth surfaces and a rear surface that are arranged in a state of being independent with a predetermined gap between the tooth surfaces and the back surface of the rack bar. A cooling medium is supplied from a heating coil, a current transformer having both the heating coils connected to the secondary side and a high-frequency oscillator connected to the primary side, and an injection cylinder disposed opposite to the tooth surface and back surface of the rack bar. A cooling medium supply device for spraying, and changing the relative positional relationship between the heating coil for the tooth surface and the heating coil for the back surface and the rack bar in the vertical direction from the high-frequency oscillator through the current transformer. A predetermined high-frequency current is simultaneously supplied to both the heating coils, and the cooling medium supply device is operated to simultaneously inject the cooling medium from the injection cylinder onto the tooth surface and back surface of the rack bar. And wherein the door.

また、請求項２に記載の発明は、前記歯面用加熱コイル及び背面用加熱コイルが、１つのカレントトランスの二次側に直列状態もしくは並列状態で接続されていることを特徴とする。また、請求項３に記載の発明は、前記歯面用加熱コイル及び背面用加熱コイルが、それぞれ専用のカレントトランスの二次側に接続されていることを特徴とする。さらに、請求項４に記載の発明は、前記歯面用加熱コイル及び背面用加熱コイルが、前記ラックバーの歯面及び背面との間の隙間が所定となるように移動可能に配置されていることを特徴とする。   The invention according to claim 2 is characterized in that the heating coil for the tooth surface and the heating coil for the back surface are connected in series or in parallel to the secondary side of one current transformer. The invention according to claim 3 is characterized in that the heating coil for the tooth surface and the heating coil for the back surface are respectively connected to the secondary side of a dedicated current transformer. Furthermore, in the invention according to claim 4, the heating coil for the tooth surface and the heating coil for the back surface are movably arranged so that a gap between the tooth surface and the back surface of the rack bar is predetermined. It is characterized by that.

本発明の請求項１に記載の発明によれば、制御装置により、例えばラックバーを縦方向に移動させることで、ラックバーと歯面用加熱コイル及び背面用加熱コイルとの相対的位置関係を変化させつつ、高周波発振機からカレントトランスを介して両加熱コイルにそれぞれ所定の高周波電流を同時に供給すると共に、冷却媒体供給装置を作動させて噴射筒から冷却媒体をラックバーの歯面と背面に同時に噴射させるため、ラックバーの歯面と背面を同時に焼入できて焼入作業の作業性を向上させつつ、歯面と背面のみを高精度に焼入することができる。   According to the first aspect of the present invention, the relative positional relationship between the rack bar, the tooth surface heating coil, and the back surface heating coil can be obtained by moving the rack bar in the vertical direction, for example, by the control device. While changing, a predetermined high-frequency current is simultaneously supplied from the high-frequency oscillator to both heating coils via a current transformer, and the cooling medium supply device is operated to supply the cooling medium from the injection cylinder to the tooth surface and back surface of the rack bar. Since the injection is performed simultaneously, the tooth surface and the back surface of the rack bar can be quenched simultaneously, improving the workability of the quenching operation, and only the tooth surface and the back surface can be quenched with high accuracy.

また、請求項２に記載の発明によれば、請求項１に記載の発明の効果に加え、歯面用加熱コイル及び背面用加熱コイルが、１つのカレントトランスの二次側に直列状態もしくは並列状態で接続されているため、カレントトランスを効率良く使用できると共にカレントトランス自体の構成を簡略化して安価な焼入装置を得ることができる。   According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, the tooth surface heating coil and the back surface heating coil are connected in series or in parallel to the secondary side of one current transformer. Since they are connected in a state, the current transformer can be used efficiently, and the configuration of the current transformer itself can be simplified to obtain an inexpensive quenching apparatus.

また、請求項３に記載の発明によれば、請求項１に記載の発明の効果に加え、歯面用加熱コイル及び背面用加熱コイルが、それぞれ専用のカレントトランスの二次側に接続されているため、各カレントトランスにより各加熱コイルに供給される高周波電流を焼入に最適な状態に容易に設定できて、ラックバーの歯面と背面を一層高精度に焼入することができる。   According to the invention described in claim 3, in addition to the effect of the invention described in claim 1, the tooth surface heating coil and the back surface heating coil are respectively connected to the secondary side of the dedicated current transformer. Therefore, the high-frequency current supplied to each heating coil by each current transformer can be easily set to an optimum state for quenching, and the tooth surface and the back surface of the rack bar can be hardened with higher accuracy.

さらに、請求項４に記載の発明によれば、請求項１ないし３に記載の発明の効果に加え、歯面用加熱コイル及び背面用加熱コイルが、垂直方向及びまたは水平方向に移動可能に配置されているため、各加熱コイルとラックバーの歯面及び背面との間の隙間を焼入に最適な値に容易に設定できて、ラックバーの歯面と背面をより一層高精度に焼入することができる。   Further, according to the invention described in claim 4, in addition to the effects of the invention described in claims 1 to 3, the tooth surface heating coil and the back surface heating coil are arranged to be movable in the vertical direction and / or the horizontal direction. Therefore, the gap between each heating coil and the tooth surface and back surface of the rack bar can be easily set to the optimum value for quenching, and the tooth surface and back surface of the rack bar can be hardened with higher accuracy. can do.

本発明に係わるラックバーの高周波焼入装置の一実施形態を示す概略構成図The schematic block diagram which shows one Embodiment of the induction hardening apparatus of the rack bar concerning this invention 同歯面用加熱コイル及び背面用加熱コイルの説明図Explanatory drawing of heating coil for tooth surface and heating coil for back surface 同焼入層の説明図Explanatory drawing of the hardened layer 本発明に係わる高周波焼入装置の他の実施形態を示す図２と同様の説明図Explanatory drawing similar to FIG. 2 which shows other embodiment of the induction hardening apparatus concerning this invention. 従来の高周波焼入装置の概略構成図Schematic configuration diagram of conventional induction hardening equipment 同その加熱コイルの説明図Explanatory drawing of the heating coil 同焼入層の説明図Explanatory drawing of the hardened layer

以下、本発明を実施するための形態を図面に基づいて詳細に説明する。
図１〜図３は、本発明に係わる高周波焼入装置の一実施形態を示している。図１に示すように、高周波焼入装置１は、図示しない支持装置により垂直状態でかつ回転不能に支持されたワークとしてのラックバーＷを、矢印イ方向である垂直方向（縦方向）に移動させるワーク移動装置２と、ラックバーＷの歯面Ｗａ及び背面Ｗｂに対向配置された歯面用加熱コイル３及び背面用加熱コイル４を備えている。 DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings.
1 to 3 show an embodiment of an induction hardening apparatus according to the present invention. As shown in FIG. 1, the induction hardening apparatus 1 moves a rack bar W as a workpiece supported in a non-rotatable state in a vertical state by a support device (not shown) in a vertical direction (longitudinal direction) that is an arrow A direction. The workpiece moving device 2 to be moved, and the tooth surface heating coil 3 and the back surface heating coil 4 disposed to face the tooth surface Wa and the back surface Wb of the rack bar W are provided.

また、前記両加熱コイル３、４がその二次側に接続されたカレントトランス５（変流器、ＣＴ）と、このカレントトランス５の一次側に接続された高周波発振機としてトランジスタインバータ６と、前記両加熱コイル３、４の下方に配置されてラックバーＷの歯面Ｗａ及び背面Ｗｂに冷却水を噴射可能な噴射筒７と、この噴射筒７に冷却水を供給する冷却媒体供給装置としての冷却水供給装置８と、前記両加熱コイル３、４を所定方向に移動させる加熱コイル移動装置９と、これらを制御する制御装置１０等を備えている。   Further, a current transformer 5 (current transformer, CT) in which both the heating coils 3 and 4 are connected to the secondary side thereof, and a transistor inverter 6 as a high-frequency oscillator connected to the primary side of the current transformer 5; An injection cylinder 7 that is disposed below the heating coils 3 and 4 and that can inject cooling water onto the tooth surfaces Wa and back Wb of the rack bar W, and a cooling medium supply device that supplies cooling water to the injection cylinder 7 A cooling water supply device 8, a heating coil moving device 9 for moving both the heating coils 3 and 4 in a predetermined direction, a control device 10 for controlling them, and the like.

前記歯面用加熱コイル３及び背面用加熱コイル４は、図２に示すように、例えば銅パイプや銅板等を所定形状に加工することで、ラックバーＷの歯面Ｗａと背面Ｗｂの長手方向（軸方向）に沿った所定長さＬ（図１参照）で所定幅ｗ１、ｗ２のコイル部３ａ、４ａと、このコイル部３ａ、４ａの上下端部に電気的及び機械的に接続されたそれぞれ一対の導体部３ｂ、４ｂを有している。そして、両加熱コイル３、４は、その上下一対の導体部３ｂ、４ｂの先端がカレントトランス５の二次側の２つの出力端子５ａに直列状態で接続、すなわち両加熱コイル３、４が１ターンのコイルとしてカレントトランス５の二次側に接続されている。   As shown in FIG. 2, the tooth surface heating coil 3 and the back surface heating coil 4 are processed in a longitudinal direction between the tooth surface Wa and the back surface Wb of the rack bar W by processing, for example, a copper pipe or a copper plate into a predetermined shape. The coil portions 3a and 4a having a predetermined length L (see FIG. 1) along the (axial direction) and the predetermined widths w1 and w2, and the upper and lower ends of the coil portions 3a and 4a are electrically and mechanically connected. Each has a pair of conductor portions 3b and 4b. The two heating coils 3, 4 are connected in series with the two output terminals 5 a on the secondary side of the current transformer 5, that is, the two heating coils 3, 4 are 1 in both ends. The coil of the turn is connected to the secondary side of the current transformer 5.

これにより、カレントトランス５の一次側と二次側の巻き数比に応じて、該カレントトランス５の二次側に前記トランジスタインバータ６の周波数に応じた大電流が得られるようになっている。また、前記歯面用加熱コイル３のコイル部３ａは、ラックバーＷの歯面Ｗａの平坦な底面形状に対応してその対向面が平板形状となるように形成され、前記背面用加熱コイル４のコイル部４ａは、ラックバーＷの背面Ｗｂの形状に対応してその対向面が略円弧形状となるように形成されている。   Thus, a large current corresponding to the frequency of the transistor inverter 6 is obtained on the secondary side of the current transformer 5 according to the turn ratio of the primary side and the secondary side of the current transformer 5. Further, the coil portion 3a of the tooth surface heating coil 3 is formed so that the opposing surface thereof has a flat plate shape corresponding to the flat bottom surface shape of the tooth surface Wa of the rack bar W, and the back surface heating coil 4 is formed. The coil portion 4a is formed so that its opposing surface has a substantially arc shape corresponding to the shape of the back surface Wb of the rack bar W.

この両加熱コイル３、４は、前記加熱コイル移動装置９に接続部材（図示せず）で接続されて、制御装置１０の制御信号で加熱コイル移動装置９が作動することにより、両加熱コイル３，４が図２の矢印ロに示すように、ラックバーＷから離れる方向に移動すると共に、矢印ロ方向と直交する矢印ハ方向に移動（もしくは回動）するようになっている。この両加熱コイル３、４の所定方向への移動により、両加熱コイル３、４とラックバーＷの歯面Ｗａ及び背面Ｗｂとの間の隙間１１ａ、１１ｂが所定に設定されて、歯面Ｗａ及び背面Ｗｂに図３（ａ）（ｂ）に示すような所望の焼入層Ｋａ、Ｋｂが得られるようになっている。   Both the heating coils 3 and 4 are connected to the heating coil moving device 9 by a connecting member (not shown), and the heating coil moving device 9 is operated by a control signal of the control device 10, whereby both the heating coils 3. , 4 move in the direction away from the rack bar W and move (or rotate) in the direction of the arrow C perpendicular to the direction of the arrow B, as indicated by the arrow B in FIG. By the movement of both the heating coils 3 and 4 in a predetermined direction, the gaps 11a and 11b between the both heating coils 3 and 4 and the tooth surface Wa and the back surface Wb of the rack bar W are set to be predetermined, and the tooth surface Wa. In addition, desired hardened layers Ka and Kb as shown in FIGS. 3A and 3B are obtained on the back surface Wb.

なお、前記歯面用加熱コイル３と背面用加熱コイル４は、カレントトランス５の二次側の２つの出力端子５ａに直列接続される構成に限らず、両加熱コイル３、４が２つの出力端子５ａに並列接続される構成とすることも勿論可能であるし、両加熱コイル３、４のコイル部３ａ、４ａの長さＬを同一ではなく異ならせることも可能である。また、両加熱コイル３、４の移動も、同時に移動させる構成としても良いし、それぞれ独立して移動させる構成としても良い。   The tooth surface heating coil 3 and the back surface heating coil 4 are not limited to the configuration in which they are connected in series to the two output terminals 5a on the secondary side of the current transformer 5, but both the heating coils 3 and 4 have two outputs. Of course, it is possible to have a configuration in which the terminals 5a are connected in parallel, and the lengths L of the coil portions 3a and 4a of the heating coils 3 and 4 may be different from each other. Moreover, the movement of both the heating coils 3 and 4 is good also as a structure moved simultaneously, and it is good also as a structure moved independently, respectively.

前記トランジスタインバータ６は、例えばトランジスタ、ＩＧＢＴ、サイリスタ等の半導体スイッチング素子を使用したインバータ回路等を有し、所定周波数の高周波電流を前記カレントトランス５を介して両加熱コイル３、４に供給するようになっている。また、前記冷却水供給装置８は、冷却水タンクとポンプ等を有し、ポンプが作動することにより、冷却ホースで接続された噴射筒７からラックバーＷの歯面Ｗａや背面Ｗｂに冷却水を噴射するようになっている。さらに、前記制御装置１０は、図示しないマイコンやタイマ等を有して、前述した各装置２、８、９やトランジスタインバータ６等を制御するようになっている。   The transistor inverter 6 includes, for example, an inverter circuit using semiconductor switching elements such as transistors, IGBTs, thyristors, etc., and supplies a high-frequency current having a predetermined frequency to both heating coils 3 and 4 via the current transformer 5. It has become. The cooling water supply device 8 includes a cooling water tank and a pump. When the pump is operated, the cooling water is supplied from the injection cylinder 7 connected by the cooling hose to the tooth surface Wa and the back surface Wb of the rack bar W. Is supposed to be injected. Further, the control device 10 has a microcomputer, a timer, and the like (not shown), and controls each of the devices 2, 8, 9 and the transistor inverter 6 described above.

次に、このように構成された高周波焼入装置１の動作の一例について説明する。先ず、ワークとしてのラックバーＷを垂直状態で図示しない支持装置で支持させ、歯面Ｗａと背面Ｗｂを所定位置にセットした状態で、制御装置１０の制御信号でトランジスタインバータ６を作動させて、カレントトランス５を介して両加熱コイル３、４に高周波電流を供給する。両加熱コイル３、４に高周波電流が供給されると、ラックバーＷの歯面Ｗａと背面Ｗｂに渦電流が誘起されて該面Ｗａ、Ｗｂが所定温度に誘導加熱される。この誘導加熱と略同時に制御装置１０の制御信号によりワーク移動装置２を作動させ、ラックバーＷを垂直方向の下方に所定の速さで移動させると共に、制御装置１０の制御信号により冷却水供給装置８を作動させて噴射筒７から冷却水をラックバーＷの歯面Ｗａ及び背面Ｗｂに向けて噴射させる。   Next, an example of operation | movement of the induction hardening apparatus 1 comprised in this way is demonstrated. First, the rack bar W as a workpiece is supported by a support device (not shown) in a vertical state, and the transistor inverter 6 is operated by a control signal of the control device 10 with the tooth surface Wa and the back surface Wb set at predetermined positions. A high-frequency current is supplied to both heating coils 3 and 4 via a current transformer 5. When a high-frequency current is supplied to both the heating coils 3 and 4, eddy currents are induced on the tooth surface Wa and the back surface Wb of the rack bar W, and the surfaces Wa and Wb are induction-heated to a predetermined temperature. At substantially the same time as the induction heating, the workpiece moving device 2 is operated by the control signal of the control device 10 to move the rack bar W downward in the vertical direction at a predetermined speed, and the cooling water supply device is controlled by the control signal of the control device 10. 8 is operated to inject cooling water from the injection cylinder 7 toward the tooth surface Wa and the back surface Wb of the rack bar W.

この冷却水の噴射で、所定温度まで誘導加熱されているラックバーＷの歯面Ｗａと背面Ｗｂが急速冷却されて、該面Ｗａ、Ｗｂが焼入される。このとき、ラックバーＷが下方に移動しつつ焼入されることから、所定長さの歯面Ｗａと背面Ｗｂが連続した状態でかつ歯面Ｗａと背面Ｗｂが同時に焼入されることになる。その結果、図３（ａ）（ｂ）に示すように、ラックバーＷの歯面Ｗａに所定形状の焼入層Ｋａが形成されると共に、背面Ｗｂにも所定形状の焼入層Ｋｂが形成され、これら両焼入層Ｋａ、Ｋｂの両端である側面Ｗｃ側は、従来のようにつながることもなく完全に離れた状態となり、歯面Ｗａと背面Ｗｂのみを所望のパターンで焼入できることになる。   By the injection of the cooling water, the tooth surfaces Wa and the back surface Wb of the rack bar W that is induction-heated to a predetermined temperature are rapidly cooled, and the surfaces Wa and Wb are quenched. At this time, since the rack bar W is quenched while moving downward, the tooth surface Wa and the back surface Wb of a predetermined length are continuous and the tooth surface Wa and the back surface Wb are simultaneously quenched. . As a result, as shown in FIGS. 3A and 3B, a hardened layer Ka having a predetermined shape is formed on the tooth surface Wa of the rack bar W, and a hardened layer Kb having a predetermined shape is also formed on the back surface Wb. The side surfaces Wc, which are both ends of the both hardened layers Ka, Kb, are completely separated without being connected as in the prior art, and only the tooth surface Wa and the back surface Wb can be hardened in a desired pattern. Become.

そして、歯面Ｗａ及び背面Ｗｂの焼入が終了したら、制御装置１０の制御信号でトランジスタインバータ６や冷却水供給装置８を停止させると共にワーク移動装置２を作動させて、ラックバーＷを上方に移動させて初期セット位置に戻し、焼入されたラックバーＷを例えば自動排出させることで、一連の焼入作業が終了する。つまり、前記高周波焼入装置１によれば、ラックバーＷの歯面Ｗａと背面Ｗｂに、該面Ｗａ、Ｗｂに対応した形状の加熱コイル３、４をそれぞれ配置し、この両加熱コイル３、４を一つのカレントトランス５の二次側に直列接続して、両加熱コイル３、４に所定の高周波電流を供給することで、独立した加熱コイル３、４で、ラックバーＷの歯面Ｗａと背面Ｗｂを縦方向に移動させつつ同時に焼入できることになる。   When the quenching of the tooth surface Wa and the back surface Wb is completed, the transistor inverter 6 and the cooling water supply device 8 are stopped by the control signal of the control device 10 and the work moving device 2 is operated to move the rack bar W upward. By moving it back to the initial setting position and automatically discharging the hardened rack bar W, for example, a series of quenching operations is completed. That is, according to the induction hardening apparatus 1, the heating coils 3 and 4 having shapes corresponding to the surfaces Wa and Wb are arranged on the tooth surface Wa and the back surface Wb of the rack bar W, respectively. 4 is connected in series to the secondary side of one current transformer 5 and a predetermined high-frequency current is supplied to both heating coils 3, 4. And the back surface Wb can be simultaneously quenched while being moved in the vertical direction.

ところで、前記実施形態においては、歯面用加熱コイル３と背面用加熱コイル４を一つのカレントトランス５の出力端子５ａに直列状態（もしくは並列状態）で接続したが、例えば図４に示すように、歯面Ｗａ用のカレントトランス５−１と背面Ｗｂ用のカレントトランス５−２を独立して配置するようにしても良い。すなわち、歯面用加熱コイル３の上下一対の導体部３ｂの先端をカレントトランス５−１の出力端子５−１ａに接続し、背面用加熱コイル４の上下一対の導体部４ｂの先端をカレントトランス５−２の出力端子５−２ａにそれぞれ接続する。この接続により、歯面用加熱コイル３と背面用加熱コイル４とがそれぞれ完全に独立して動作することになる。   Incidentally, in the above embodiment, the tooth surface heating coil 3 and the back surface heating coil 4 are connected in series (or in parallel) to the output terminal 5a of one current transformer 5, but for example as shown in FIG. The current transformer 5-1 for the tooth surface Wa and the current transformer 5-2 for the back surface Wb may be arranged independently. That is, the tips of the pair of upper and lower conductor portions 3b of the tooth surface heating coil 3 are connected to the output terminal 5-1a of the current transformer 5-1, and the tips of the pair of upper and lower conductor portions 4b of the back surface heating coil 4 are connected to the current transformer. Connected to the output terminal 5-2a of 5-2. By this connection, the tooth surface heating coil 3 and the back surface heating coil 4 operate completely independently.

このように、前記実施形態の高周波焼入装置１においては、制御装置１０の制御により、ワーク移動装置２を作動させてラックバーＷを垂直方向に移動させつつ、トランジスタインバータ６からカレントトランス５を介して歯面用及び背面用の両加熱コイル３、４にそれぞれ所定の高周波電流を同時に供給すると共に、冷却水供給装置８を作動させて噴射筒７から冷却水をラックバーＷの歯面Ｗａと背面Ｗｂに同時に噴射するため、縦方向に移動可能なラックバーＷの歯面Ｗａと背面Ｗｂに対して加熱コイル３、４をそれぞれ独立した状態で配置できて、同時焼入による焼入作業の作業性を向上させつつ、歯面Ｗａと背面Ｗｂに高精度な焼入層Ｋａ、Ｋｂを容易に得ることができる。   As described above, in the induction hardening apparatus 1 of the above-described embodiment, the current transformer 5 is moved from the transistor inverter 6 while operating the work moving device 2 to move the rack bar W in the vertical direction under the control of the control device 10. And simultaneously supplying predetermined high-frequency currents to the heating coils 3 and 4 for the tooth surface and the back surface of the tooth surface, and operating the cooling water supply device 8 to supply cooling water from the injection cylinder 7 to the tooth surface Wa of the rack bar W. Since the heating coils 3 and 4 can be arranged independently from each other on the tooth surface Wa and the back surface Wb of the rack bar W that can move in the vertical direction, the quenching work by simultaneous quenching is possible. Thus, it is possible to easily obtain the hardened layers Ka and Kb with high accuracy on the tooth surface Wa and the back surface Wb.

特に、セット状態のラックバーＷが縦方向に移動するのみで軸回りに回転しないため、移動焼入する際に、各加熱コイル３、４とラックバーＷの歯面Ｗａ及び背面Ｗｂの位置関係が変化することがなく、所定の位置関係を維持することができる。その結果、それぞれ独立した加熱コイル３、４により歯面Ｗａと背面Ｗｂの焼入範囲を所定に設定できて、例えば背面Ｗｂにおいて、焼入範囲角度が７５度以上で、中央の厚い部分が１．５ｍｍ程度で両端の薄い部分が０．３ｍｍ程度の三日月形状の焼入層Ｋｂを確実に形成することができる等、ラックバーＷに客先の要望に応じた焼入品質を安定して得ることが可能になる。   In particular, since the rack bar W in the set state only moves in the vertical direction and does not rotate around the axis, the positional relationship between the heating coils 3 and 4 and the tooth surface Wa and the back surface Wb of the rack bar W when moving and quenching is performed. The predetermined positional relationship can be maintained without changing. As a result, the quenching range of the tooth surface Wa and the back surface Wb can be set to a predetermined value by the heating coils 3 and 4 that are independent of each other. For example, the back surface Wb has a quenching range angle of 75 degrees or more and a central thick portion is 1 The crucible-shaped quenching layer Kb having a thickness of about 5 mm and thin portions at both ends of about 0.3 mm can be reliably formed, and the rack bar W can stably obtain the quenching quality according to the customer's request. It becomes possible.

また、歯面用加熱コイル３及び背面用加熱コイル４が、１つのカレントトランス５の二次側に直列状態もしくは並列状態で接続されているため、カレントトランス５を効率良く使用できると共にカレントトランス５自体の構成を簡略化して安価な高周波焼入装置１を得ることができる。さらに、歯面用加熱コイル３及び背面用加熱コイル４が、所定方向に移動可能に配置されているため、各加熱コイル３、４とラックバーＷの歯面Ｗａ及び背面Ｗｂとの間の隙間１１ａ、１１ｂを焼入に最適な値に容易に設定できる等、ラックバーＷの歯面Ｗａと背面Ｗｂをより一層高精度に焼入することができる。   Further, since the tooth surface heating coil 3 and the back surface heating coil 4 are connected in series or in parallel to the secondary side of one current transformer 5, the current transformer 5 can be used efficiently and the current transformer 5 can be used efficiently. An inexpensive induction hardening apparatus 1 can be obtained by simplifying the structure of itself. Further, since the tooth surface heating coil 3 and the back surface heating coil 4 are arranged to be movable in a predetermined direction, a gap between each heating coil 3, 4 and the tooth surface Wa and the back surface Wb of the rack bar W is provided. It is possible to harden the tooth surface Wa and the back surface Wb of the rack bar W with higher accuracy, such as easily setting 11a and 11b to the optimum values for quenching.

また、他の実施形態で示すように、歯面用加熱コイル３及び背面用加熱コイル４を、それぞれ専用のカレントトランス５−１、５−２の二次側に接続するようにすれば、それぞれ独立したカレントトランス５−１、５−２により各加熱コイル３、４に供給される電流値等を、焼入に最適な状態に容易に設定して、ラックバーＷの歯面Ｗａと背面Ｗｂの焼入層Ｋａ、Ｋｂの範囲やその深さ及び硬度等を所望に設定できる等、一層高精度な焼入状態を確実に得ることが可能になる。   Further, as shown in other embodiments, if the tooth surface heating coil 3 and the back surface heating coil 4 are connected to the secondary side of the dedicated current transformers 5-1, 5-2, respectively, The current values supplied to the heating coils 3 and 4 by the independent current transformers 5-1 and 5-2 are easily set to an optimum state for quenching, and the tooth surface Wa and the back surface Wb of the rack bar W are set. Thus, it is possible to reliably obtain a hardened state with higher accuracy, for example, the range of the hardened layers Ka, Kb, the depth and hardness thereof can be set as desired.

なお、前記実施形態においては、ワーク移動移動装置２を配置してラックバーＷを縦方向に移動させつつ、固定位置に配置した両加熱コイル３、４と噴射筒７を使用して移動焼入したが、本発明は、この構成に限定されず、ラックバーＷを固定位置に配置し、加熱コイル３、４と噴射筒７を移動させてその相対的位置関係を変化させつつラックバーＷを焼入する構成であっても良い。また、前記実施形態においては、加熱コイル移動装置９により加熱コイル３、４を移動させてラックバーＷの歯面Ｗａと背面Ｗｂとの間の隙間１１ａ、１１ｂを調整可能としたが、予め所定の隙間１１ａ、１１ｂとなるように両加熱コイル３、４の少なくとも一方を固定的に配置することもできる。   In the above-described embodiment, the workpiece moving and moving device 2 is arranged to move the rack bar W in the vertical direction, and the moving quenching is performed using both the heating coils 3 and 4 and the injection cylinder 7 arranged at the fixed position. However, the present invention is not limited to this configuration. The rack bar W is disposed at a fixed position, and the rack bar W is moved while the heating coils 3 and 4 and the injection cylinder 7 are moved to change the relative positional relationship between them. The structure which quenches may be sufficient. In the embodiment, the heating coils 3 and 4 are moved by the heating coil moving device 9 so that the gaps 11a and 11b between the tooth surface Wa and the back surface Wb of the rack bar W can be adjusted. At least one of the heating coils 3 and 4 can be fixedly arranged so as to be the gaps 11a and 11b.

さらに、前記実施形態においては、両加熱コイル３，４と噴射筒７をそれぞれ別体で形成したが、これらを一体化することも可能であるし、噴射筒７から噴射される冷却媒体として、冷却水の他に適宜の冷却媒体を使用することも可能である。また、前記実施形態における、両加熱コイル３、４の形状、装置の概略構成図（ブロック図）等は一例であって、本発明に係わる各発明の要旨を逸脱しない範囲において、適宜に変更することができる。   Furthermore, in the said embodiment, although both the heating coils 3 and 4 and the injection cylinder 7 were each formed separately, these can also be integrated and as a cooling medium injected from the injection cylinder 7, An appropriate cooling medium can be used in addition to the cooling water. Moreover, the shape of both the heating coils 3 and 4 in the said embodiment, the schematic block diagram (block diagram) of an apparatus, etc. are examples, Comprising: In the range which does not deviate from the summary of each invention concerning this invention, it changes suitably. be able to.

本発明は、各種形態のラックバーの歯面と背面を誘導加熱を利用して同時に焼入する全ての高周波焼入装置に適用できる。   The present invention can be applied to all induction hardening apparatuses that simultaneously harden the tooth surfaces and back surfaces of rack bars of various forms using induction heating.

１・・・高周波焼入装置、２・・・ワーク移動装置、３・・・歯面用加熱コイル、３ａ・・・コイル部、３ｂ・・・導体部、４・・・背面用加熱コイル、４ａ・・・コイル部、４ｂ・・・導体部、５・・・カレントトランス、５ａ・・・出力端子、５−１、５−２・・・カレントトランス、５−１ａ、５−２ａ・・・出力端子、６・・・トランジスタインバータ、７・・・噴射筒、８・・・冷却水供給装置、９・・・加熱コイル移動装置、１１ａ、１１ｂ・・・隙間、Ｗ・・・ラックバー、Ｗａ・・・歯面、Ｗｂ・・・背面、Ｋａ、Ｋｂ・・・焼入層。   DESCRIPTION OF SYMBOLS 1 ... Induction hardening apparatus, 2 ... Work moving apparatus, 3 ... Heating coil for tooth surfaces, 3a ... Coil part, 3b ... Conductor part, 4 ... Heating coil for back surfaces, 4a ... Coil part, 4b ... Conductor part, 5 ... Current transformer, 5a ... Output terminal, 5-1, 5-2 ... Current transformer, 5-1a, 5-2a ... Output terminal, 6 ... transistor inverter, 7 ... injection cylinder, 8 ... cooling water supply device, 9 ... heating coil moving device, 11a, 11b ... gap, W ... rack bar Wa ... tooth surface, Wb ... back surface, Ka, Kb ... hardened layer.

Claims (4)

ラックバーの歯面及び背面に所定の隙間を有して独立した状態で配置される歯面用加熱コイル及び背面用加熱コイルと、二次側に前記両加熱コイルが接続されると共に一次側に高周波発振機が接続されたカレントトランスと、前記ラックバーの歯面及び背面に対向配置された噴射筒から冷却媒体を噴射させる冷却媒体供給装置と、を備え、
前記歯面用加熱コイル及び背面用加熱コイルとラックバーとの相対的位置関係を垂直方向で変化させつつ、前記高周波発振機からカレントトランスを介して前記両加熱コイルにそれぞれ所定の高周波電流を同時に供給すると共に、前記冷却媒体供給装置を作動させて前記噴射筒から冷却媒体をラックバーの歯面と背面に同時に噴射させることを特徴とするラックバーの高周波焼入装置。 Tooth surface heating coil and back surface heating coil that are arranged independently with a predetermined gap on the tooth surface and back surface of the rack bar, and both the heating coils are connected to the secondary side and to the primary side A current transformer to which a high-frequency oscillator is connected; and a cooling medium supply device for injecting a cooling medium from an injection cylinder arranged to face the tooth surface and the back surface of the rack bar.
While changing the relative positional relationship between the tooth surface heating coil and the back surface heating coil and the rack bar in the vertical direction, a predetermined high frequency current is simultaneously applied to both the heating coils from the high frequency oscillator via a current transformer. A rack bar induction hardening apparatus characterized in that the cooling medium supply device is operated and the cooling medium is simultaneously injected from the injection cylinder onto the tooth surface and back surface of the rack bar. 前記歯面用加熱コイル及び背面用加熱コイルは、１つのカレントトランスの二次側に直列状態もしくは並列状態で接続されていることを特徴とする請求項１に記載のラックバーの高周波焼入装置。   The induction hardening apparatus for a rack bar according to claim 1, wherein the tooth surface heating coil and the back surface heating coil are connected in series or in parallel to the secondary side of one current transformer. . 前記歯面用加熱コイル及び背面用加熱コイルは、それぞれ専用のカレントトランスの二次側に接続されていることを特徴とする請求項１に記載のラックバーの高周波焼入装置。   The induction hardening apparatus for a rack bar according to claim 1, wherein the tooth surface heating coil and the back surface heating coil are respectively connected to a secondary side of a dedicated current transformer. 前記歯面用加熱コイル及び背面用加熱コイルは、前記ラッククバーの歯面及び背面との間の隙間が所定となるように移動可能に配置されていることを特徴とする請求項１ないし３のいずれかに記載のラックバーの高周波焼入装置。   The said heating coil for tooth surfaces and the heating coil for back surfaces are arrange | positioned so that a clearance gap between the tooth surface of the said rack bar and the back surface becomes predetermined | prescribed, It is any one of Claim 1 thru | or 3 characterized by the above-mentioned. An induction hardening apparatus for rack bars according to claim 1.
JP2013003471A 2013-01-11 2013-01-11 Rack bar induction hardening equipment Active JP6057329B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2013003471A JP6057329B2 (en) 2013-01-11 2013-01-11 Rack bar induction hardening equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2013003471A JP6057329B2 (en) 2013-01-11 2013-01-11 Rack bar induction hardening equipment

Publications (2)

Publication Number Publication Date
JP2014133929A JP2014133929A (en) 2014-07-24
JP6057329B2 true JP6057329B2 (en) 2017-01-11

Family

ID=51412423

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2013003471A Active JP6057329B2 (en) 2013-01-11 2013-01-11 Rack bar induction hardening equipment

Country Status (1)

Country Link
JP (1) JP6057329B2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7306027B2 (en) * 2019-04-02 2023-07-11 株式会社ジェイテクト Rack bar and steering device
CN112553427B (en) * 2020-11-28 2022-07-08 浙江索特传动科技有限公司 Quenching equipment for V-shaped guide rail rack

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62178471A (en) * 1986-01-31 1987-08-05 Yamada Seisakusho:Kk Rack shaft for steering device
JPH07268481A (en) * 1994-03-29 1995-10-17 Toyota Motor Corp High-frequency hardening method of rack shaft
JP4115694B2 (en) * 2001-11-06 2008-07-09 富士電子工業株式会社 Rack gear hardening device
JP5072234B2 (en) * 2006-02-21 2012-11-14 株式会社ミヤデン Rack bar induction hardening equipment
JP5419269B2 (en) * 2009-09-16 2014-02-19 株式会社ミヤデン High frequency induction heating device
JP5509869B2 (en) * 2010-01-21 2014-06-04 日本精工株式会社 Manufacturing method of rack and pinion type steering device

Also Published As

Publication number Publication date
JP2014133929A (en) 2014-07-24

Similar Documents

Publication Publication Date Title
KR101313980B1 (en) Hot stamping method using resistance heating and resistance heating device for the same
JP4926728B2 (en) Spline shaft, heat treatment method and heat treatment apparatus
US20190030584A1 (en) Heating method, heating apparatus, and hot press molding method for plate workpiece
CN101509062B (en) Method for quenching end socket ribbet position of assembled camshaft
JP6057329B2 (en) Rack bar induction hardening equipment
JP2013095950A (en) Hardening apparatus for shaft-shaped workpiece
JP4235336B2 (en) Induction hardening method of rack bar and induction hardening apparatus thereof
JP6628398B2 (en) Electric heating device for steering rack bar
JP5553440B2 (en) Heat treatment method and heat treatment apparatus
US2512893A (en) Induction heating and quenching apparatus
JP2014173148A (en) Method for producing thin three-dimensional shape body
JP6511286B2 (en) Quenching apparatus and method
JP2006028589A (en) Hardening and tempering method with direct electric-conduction hardening apparatus
JP2011190510A (en) Energization-heating method and energization-heating apparatus
JP5311257B2 (en) Power transformer for steel heating device and steel heating device
JP6114945B2 (en) Heating coil and heat treatment device
JP5875176B2 (en) Electrical heating device for shaft workpiece
KR101478614B1 (en) Bed-Coil Device For A Heat Treatment With High Frequency.
JP7457970B2 (en) Induction heating coil and induction heating device
JP6108613B2 (en) Induction heating apparatus and heat treatment method
KR101985467B1 (en) Heating apparatus of hot-stamping material
JP2011063831A (en) High frequency induction heating apparatus
JP2004307967A (en) Induction hardening and tempering device
JP6537164B2 (en) Rack bar electric heating device
JP2024067424A (en) Quenching device and quenching method

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20160107

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20161114

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20161130

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20161130

R150 Certificate of patent or registration of utility model

Ref document number: 6057329

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250