JP6427391B2 - Hardening device and hardening method - Google Patents

Hardening device and hardening method Download PDF

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JP6427391B2
JP6427391B2 JP2014228993A JP2014228993A JP6427391B2 JP 6427391 B2 JP6427391 B2 JP 6427391B2 JP 2014228993 A JP2014228993 A JP 2014228993A JP 2014228993 A JP2014228993 A JP 2014228993A JP 6427391 B2 JP6427391 B2 JP 6427391B2
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cooling
shaft member
stepped shaft
cooling jacket
heating coil
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JP2016089262A (en
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勝登 小池
勝登 小池
高橋　正之
正之 高橋
剛功 小玉
剛功 小玉
一希 荒井
一希 荒井
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Neturen Co Ltd
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Neturen Co Ltd
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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
    • 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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Description

本発明は、段付き軸部材の焼入れ装置及び焼入れ方法に関する。   The present invention relates to a hardening device and a hardening method for a stepped shaft member.

特許文献１に記載された焼入れ装置は、段付き軸部材を誘導加熱する加熱コイル及び加熱コイルによって加熱された段付き軸部材に冷却液を吹き付ける冷却ジャケットを一体として、加熱コイル及び冷却ジャケットと段付き軸部材とを段付き軸部材の中心軸に沿って相対移動させながら、段付き軸部材の各部を連続的に加熱冷却して焼入れするものである。   The hardening device described in Patent Document 1 comprises a heating coil for cooling a stepped shaft member inductively heating a stepped shaft member and a cooling jacket for spraying a cooling liquid on the stepped shaft member heated by the heating coil, and the heating coil and the cooling jacket and step. The respective portions of the stepped shaft member are continuously heated and cooled to be quenched while relatively moving the attached shaft member along the central axis of the stepped shaft member.

そして、特許文献１に記載された焼入れ装置では、均一な焼入れ硬さを得るため、径差部（太い部位と細い部位との接合部にあって凹となる隅部）のうち、冷却液がかかり易い径差部では冷却液の噴射量を減少させ、冷却液がかかり難い径差部では冷却液の噴射量を増加させている。   And in the hardening apparatus described in patent document 1, in order to obtain uniform hardening hardness, a cooling fluid is the cooling fluid among the diameter difference parts (The corner which exists in the junction of a thick part and a thin part and becomes concave). The injection amount of the coolant is reduced in the diameter difference portion which is likely to be applied, and the injection amount of the coolant is increased in the diameter difference portion where the coolant is not easily applied.

特開２００５−３４４１５９号公報JP 2005-344159 A

特許文献１に記載された焼入れ装置は、段付き軸部材において凹となる隅部に着目し、均一な焼入れ硬さを得る目的で隅部での流量を調節しているが、段付き軸部材では、太い部位の端部にあって凸となる角部が過熱される傾向にある。そして、角部の冷却速度が過大であると角部に焼割れが生じる虞がある。   Although the hardening device described in Patent Document 1 focuses on the corner portion which becomes concave in the stepped shaft member and adjusts the flow rate at the corner portion in order to obtain uniform hardening hardness, the stepped shaft member In this case, the convex corner at the end of the thick portion tends to be overheated. And if the cooling rate of the corner portion is excessive, there is a possibility that the crack may occur in the corner portion.

本発明は、上述した事情に鑑みなされたものであり、焼割れの発生を抑制することができる段付き軸部材の焼入れ装置及び焼入れ方法を提供することを目的としている。   This invention is made in view of the situation mentioned above, and an object of this invention is to provide the hardening apparatus and hardening method of a stepped shaft member which can control generation | occurrence | production of a quenching crack.

本発明の一態様の焼入れ装置は、軸方向に隣設された相対的に太い部位と相対的に細い部位とを有する段付き軸部材の焼入れ装置であって、前記段付き軸部材を誘導加熱する加熱コイルと、前記加熱コイルによって加熱された前記段付き軸部材に冷却液を吹き付ける冷却ジャケットと、前記加熱コイル及び前記冷却ジャケットを一体として、前記加熱コイル及び前記冷却ジャケットと前記段付き軸部材とを前記段付き軸部材の中心軸に沿って相対移動させる駆動部と、を備え、前記冷却ジャケットから噴射される冷却液の単位時間当たりの噴射量が、前記太い部位の冷却と前記細い部位の冷却とで変更され、前記太い部位の冷却における前記噴射量は、前記細い部位の冷却における前記噴射量よりも少ない。
また、本発明の一態様の焼入れ方法は、軸方向に隣設された相対的に太い部位と相対的に細い部位とを有する段付き軸部材の焼入れ方法であって、前記段付き軸部材を誘導加熱する加熱コイルと、前記加熱コイルによって加熱された前記段付き軸部材に冷却液を吹き付ける冷却ジャケットと、を一体として、前記加熱コイル及び前記冷却ジャケットと前記段付き軸部材とを前記段付き軸部材の中心軸に沿って相対移動させながら、段付き軸部材の各部を加熱冷却して焼入れし、前記冷却ジャケットから噴射される冷却液の単位時間当たりの噴射量を、前記太い部位の冷却と前記細い部位の冷却とで変更し、前記太い部位の冷却における前記噴射量を、前記細い部位の冷却における前記噴射量よりも少なくする。
The hardening device according to one aspect of the present invention is a hardening device for a stepped shaft member having a relatively thick portion and a relatively thin portion provided adjacent to each other in the axial direction, wherein the stepped shaft member is induction heated Heating coil, a cooling jacket for blowing a cooling fluid to the stepped shaft member heated by the heating coil, the heating coil and the cooling jacket integrally, the heating coil, the cooling jacket, and the stepped shaft member And a drive unit for relatively moving the stepped shaft member along the central axis of the stepped shaft member, wherein the injection amount per unit time of the cooling liquid injected from the cooling jacket is the cooling of the thick portion and the thin portion And the injection amount in the cooling of the thick portion is smaller than the injection amount in the cooling of the thin portion .
The hardening method according to one aspect of the present invention is a hardening method of a stepped shaft member having a relatively thick portion and a relatively thin portion provided adjacent to each other in the axial direction. The heating coil for induction heating and a cooling jacket for blowing a coolant to the stepped shaft member heated by the heating coil are integrated with the heating coil, the cooling jacket, and the stepped shaft member stepped Each part of the stepped shaft member is heated, cooled and quenched while being relatively moved along the central axis of the shaft member, and the injection amount per unit time of the cooling fluid injected from the cooling jacket is the cooling of the thick portion And the cooling of the thin portion, and the injection amount in the cooling of the thick portion is smaller than the injection amount in the cooling of the thin portion .

本発明によれば、焼割れの発生を抑制することができる段付き軸部材の焼入れ装置及び焼入れ方法を提供することができる。   According to the present invention, it is possible to provide a hardening device and a hardening method for a stepped shaft member capable of suppressing the occurrence of quenching cracks.

本発明の実施形態を説明するための、焼入れ装置の一例の構成を示す図である。It is a figure showing composition of an example of a hardening device for describing an embodiment of the present invention. 図１の焼入れ装置の冷却ジャケットに冷却液を供給する冷却液供給部の構成を示す図である。It is a figure which shows the structure of the cooling fluid supply part which supplies a cooling fluid to the cooling jacket of the hardening apparatus of FIG. 図１の焼入れ装置を用いた段付き軸部材の焼入れ方法の一例を示す図である。It is a figure which shows an example of the hardening method of the stepped shaft member using the hardening apparatus of FIG.

図１は、本発明の実施形態を説明するための、焼入れ装置の一例の構成を示す。   FIG. 1 shows a configuration of an example of a hardening device for describing an embodiment of the present invention.

焼入れ装置１は、段付き軸部材（以下、ワークと称する）Ｗを焼入れするものである。ワークＷは、図示の例では、全体として略円柱状を呈し、相対的に太い大径軸部Ｗａと、大径軸部Ｗａの軸方向片側に隣設された相対的に細い小径軸部Ｗｂとを有している。なお、ワークＷは、図示のものに限られず、例えば略角柱状のものであってもよいし、大径軸部Ｗａの軸方向両側に小径軸部Ｗｂが設けられていてもよい。   The hardening device 1 is for hardening a stepped shaft member (hereinafter referred to as a work) W. In the example shown, the workpiece W has a substantially cylindrical shape as a whole, and a relatively thin small diameter shaft portion Wb provided relatively thick on the large diameter shaft portion Wa and on one side of the large diameter shaft portion Wa in the axial direction. And. The work W is not limited to the illustrated one, and may be, for example, a substantially prismatic shape, or the small diameter shaft portions Wb may be provided on both sides in the axial direction of the large diameter shaft portion Wa.

焼入れ装置１は、ワークＷを誘導加熱する加熱コイル２と、加熱コイル２に交流電力を供給する電源部３と、加熱コイル２によって加熱されたワークＷに冷却液を吹き付ける冷却ジャケット４と、冷却ジャケット４に冷却液を供給する冷却液供給部５と、ワークＷを支持するワーク支持部６と、制御部７とを備える。   The hardening device 1 includes a heating coil 2 for induction heating the workpiece W, a power supply unit 3 for supplying AC power to the heating coil 2, a cooling jacket 4 for spraying a coolant onto the workpiece W heated by the heating coil 2, and cooling A coolant supply unit 5 for supplying a coolant to the jacket 4, a work support unit 6 for supporting a work W, and a control unit 7 are provided.

ワーク支持部６は、ワークＷの両端部をワークＷの軸方向に挟持する第１支持部６０及び第２支持部６１と、第１支持部６０及び第２支持部６１をワークＷの軸方向に進退移動させる駆動部６２とを有している。駆動部６２には、例えばボールネジやシリンダピストンなどを用いた適宜な直動機構が用いられる。なおワークＷを中心軸まわりに回転させる回転機構をワーク支持部６に設け、ワークＷを誘導加熱する際に、必要に応じてワークＷを回転させるようにしてもよい。   The work support portion 6 includes a first support portion 60 and a second support portion 61 which sandwich both ends of the work W in the axial direction of the work W, and the first support portion 60 and the second support portion 61 in the axial direction of the work W And a drive unit 62 for moving to and from. For the drive unit 62, a suitable linear motion mechanism using, for example, a ball screw or a cylinder piston is used. A rotating mechanism for rotating the work W around the central axis may be provided on the work support portion 6 and the work W may be rotated as needed when the work W is induction heated.

加熱コイル２は、ワークＷの外形に対応して円環状を呈し、ワークＷを挿通可能に形成されている。なお、加熱コイル２の形状は、ワークＷの形状などに応じて適宜選択され、例えばワークＷが角柱状である場合には、ワークＷの外形に対応して角環状とされる。   The heating coil 2 has an annular shape corresponding to the outer shape of the work W, and is formed so that the work W can be inserted. In addition, the shape of the heating coil 2 is suitably selected according to the shape etc. of the workpiece | work W, for example, when the workpiece | work W is prismatic shape, according to the external shape of the workpiece | work W, it is made into square ring shape.

電源部３から加熱コイル２に交流電力が供給されると、加熱コイル２の内側に位置するワークＷの被加熱部位には電磁誘導によって電流が流れ、それにより被加熱部位が加熱される。   When AC power is supplied from the power supply unit 3 to the heating coil 2, an electric current flows to the heated portion of the work W located inside the heating coil 2 by electromagnetic induction, and thereby the heated portion is heated.

冷却ジャケット４は、ワークＷの外形に対応して円環状を呈し、ワークＷを挿通可能に形成されている。冷却ジャケット４の内部には円環状に延びる流路４０が形成されており、また、挿通されるワークＷに向く冷却ジャケット４の内周壁には、流路４０に連通する多数のノズル孔４１が形成されている。   The cooling jacket 4 has an annular shape corresponding to the outer shape of the work W, and is formed so that the work W can be inserted. An annularly extending flow passage 40 is formed inside the cooling jacket 4, and a large number of nozzle holes 41 communicating with the flow passage 40 are formed in the inner peripheral wall of the cooling jacket 4 facing the work W to be inserted. It is formed.

冷却液供給部５から冷却ジャケット４に冷却液が供給されると、流路４０を経てノズル孔４１の各々からワークＷに向けて冷却液が噴射される。冷却液としては、例えば水などが用いられる。   When the coolant is supplied from the coolant supply unit 5 to the cooling jacket 4, the coolant is jetted from each of the nozzle holes 41 toward the work W through the flow path 40. As a cooling fluid, water etc. are used, for example.

制御部７は、ワーク支持部６によるワークＷの移動や、電源部３から加熱コイル２への交流電力の供給や、冷却液供給部５から冷却ジャケット４への冷却液の供給を統括的に制御する。   The control unit 7 comprehensively moves the work W by the work supporting unit 6, supplies AC power from the power supply unit 3 to the heating coil 2, and supplies cooling fluid from the cooling fluid supply unit 5 to the cooling jacket 4. Control.

焼入れ装置１を用いたワークＷの焼入れにおいて、図示の例では、加熱コイル２及び冷却ジャケット４がワークＷの大径軸部Ｗａに被さる位置に配置される。ワーク支持部６によってワークＷが軸方向に移動され、加熱コイル２及び冷却ジャケット４は、相対的にワークＷの中心軸に沿って小径軸部Ｗｂ側に向けて一体に移動される。   In quenching of the work W using the quenching device 1, in the example shown in the drawing, the heating coil 2 and the cooling jacket 4 are disposed at a position to cover the large diameter shaft portion Wa of the work W. The workpiece W is moved in the axial direction by the workpiece support 6, and the heating coil 2 and the cooling jacket 4 are relatively moved integrally along the central axis of the workpiece W toward the small diameter shaft portion Wb.

加熱コイル２の相対移動に伴い、ワークＷの被加熱部位が小径軸部Ｗｂ側に向けて逐次移り、ワークＷの各部が連続的に誘導加熱される。冷却ジャケット４は、加熱コイル２及び冷却ジャケット４の相対移動方向に加熱コイル２の後側に配置されており、加熱コイル２によって加熱されたワークＷには、冷却ジャケット４から噴射された冷却液が吹き付けられる。それにより、ワークＷの各部が加熱冷却され、焼入れされる。   With the relative movement of the heating coil 2, the heated portion of the workpiece W sequentially moves toward the small diameter shaft portion Wb, and each portion of the workpiece W is continuously induction heated. The cooling jacket 4 is disposed on the rear side of the heating coil 2 in the relative movement direction of the heating coil 2 and the cooling jacket 4, and the coolant W sprayed from the cooling jacket 4 is applied to the work W heated by the heating coil 2. Is sprayed. Thus, each part of the workpiece W is heated and cooled and hardened.

なお、本例では、ワークＷの大径軸部Ｗａ側から小径軸部Ｗｂ側に向けて加熱コイル２及び冷却ジャケット４を相対移動させるものとして説明したが、小径軸部Ｗｂ側から大径軸部Ｗａ側に移動させてもよい。また、本例では、ワークＷを移動させるものとして説明したが、加熱コイル２及び冷却ジャケット４を移動させてもよい。   In this example, although the heating coil 2 and the cooling jacket 4 are relatively moved from the large diameter axial portion Wa side of the work W toward the small diameter axial portion Wb side, the large diameter axial portion from the small diameter axial portion Wb side You may move to the part Wa side. Moreover, although it demonstrated as what moves the workpiece | work W in this example, you may move the heating coil 2 and the cooling jacket 4. FIG.

好ましくは、冷却液は、図示の例のように、加熱コイル２及び冷却ジャケット４の相対移動方向における後側に向けてワークＷの中心軸に斜交する方向に冷却ジャケット４から噴射される。それにより、加熱コイル２の内側に位置するワークＷの被加熱部位に冷却液が飛散して被加熱部位の加熱が不足することが抑制される。   Preferably, the coolant is jetted from the cooling jacket 4 in a direction oblique to the central axis of the work W toward the rear side in the relative movement direction of the heating coil 2 and the cooling jacket 4 as in the illustrated example. Thereby, it is suppressed that a cooling fluid disperses to the to-be-heated site | part of the workpiece | work W located inside the heating coil 2, and heating of a to-be-heated site | part runs short.

上記のワークＷに対する焼入れにおいて、大径軸部Ｗａの冷却と小径軸部Ｗｂの冷却とで冷却ジャケット４から噴射される冷却液の単位時間当たりの噴射量が変更される。   In the hardening of the work W described above, the amount of injection per unit time of the cooling fluid injected from the cooling jacket 4 is changed by the cooling of the large diameter shaft portion Wa and the cooling of the small diameter shaft portion Wb.

図２は、冷却液供給部５の構成を示す。   FIG. 2 shows the configuration of the coolant supply unit 5.

冷却液供給部５は、二つの冷却液供給源５０，５１と、冷却液供給源５０と冷却ジャケット４とを接続する配管５２及び冷却液供給源５１と冷却ジャケット４とを接続する配管５３とを有する。そして、配管５２，５３には、開閉可能な制御弁５４がそれぞれ設けられており、制御弁５４の開閉動作は制御部７によって制御される。   The coolant supply unit 5 includes two coolant supply sources 50 and 51, a pipe 52 connecting the coolant supply source 50 and the cooling jacket 4, and a pipe 53 connecting the coolant supply source 51 and the cooling jacket 4. Have. And the control valves 54 which can be opened and closed are provided in the pipes 52 and 53, respectively, and the opening and closing operation of the control valves 54 is controlled by the control unit 7.

以上の構成において、例えば一方の配管５２（５３）の制御弁５４が開かれ、他方の配管５３（５２）の制御弁５４が閉じられた場合と、両配管５２，５３の制御弁５４がいずれも開かれた場合とで、冷却ジャケット４に供給される単位時間当たりの冷却液の流量が異なり、冷却ジャケット４から噴射される冷却液の単位時間当たりの噴射量が変更される。なお、冷却液供給源５０，５１の単位時間当たりの冷却液の供給量が異なる場合には、配管５２，５３の各々の制御弁５４を択一的に開くことによっても、冷却ジャケット４から噴射される冷却液の単位時間当たりの噴射量を変えることができる。   In the above configuration, for example, when the control valve 54 of one pipe 52 (53) is opened and the control valve 54 of the other pipe 53 (52) is closed, the control valve 54 of both pipes 52, 53 is either Even when it is opened, the flow rate of the coolant per unit time supplied to the cooling jacket 4 is different, and the injection amount per unit time of the coolant sprayed from the cooling jacket 4 is changed. In addition, when the supply amount of the coolant per unit time of the coolant supply source 50, 51 is different, the control jacket 54 of each of the pipes 52, 53 may be alternatively opened to inject the coolant from the cooling jacket 4 as well. It is possible to change the injection amount per unit time of the cooled liquid.

図３は、焼入れ装置１を用いたワークＷの焼入れ方法の一例を示す。   FIG. 3 shows an example of a method of hardening the workpiece W using the hardening device 1.

上記のとおり、加熱コイル２及び冷却ジャケット４の相対移動に伴い、ワークＷの大径軸部Ｗａ側からワークＷの各部が逐次加熱冷却される。   As described above, with the relative movement of the heating coil 2 and the cooling jacket 4, each part of the work W is sequentially heated and cooled from the side of the large diameter shaft part Wa of the work W.

加熱コイル２及び冷却ジャケット４が大径軸部Ｗａの一方の端部にあって凸となる角部Ｗｃを越えたタイミングで、冷却ジャケット４から噴射される冷却液の単位時間当たりの噴射量が変更される。なお、加熱コイル２及び冷却ジャケット４が角部Ｗｃを越えるタイミングは、例えば大径軸部Ｗａの長さ及び加熱コイル２及び冷却ジャケット４の初期位置からの相対移動量に基づいて検出することができる。   At a timing when the heating coil 2 and the cooling jacket 4 are at one end of the large diameter shaft portion Wa and exceed the convex corner Wc, the injection amount per unit time of the cooling fluid injected from the cooling jacket 4 is Be changed. The timing at which the heating coil 2 and the cooling jacket 4 exceed the corner Wc may be detected based on, for example, the length of the large diameter shaft portion Wa and the relative movement from the initial position of the heating coil 2 and the cooling jacket 4. it can.

大径軸部Ｗａの角部Ｗｃは過熱される傾向にあり、冷却速度が過大であると焼割れが発生し易い。一方、小径軸部Ｗｂでは、ワークＷと冷却ジャケット４との間のギャップが大径軸部Ｗａよりも大きく、冷却ジャケット４から噴射された冷却液が拡散して冷却効率が低下する傾向にある。   The corner portion Wc of the large diameter shaft portion Wa tends to be overheated, and if the cooling rate is excessive, a quench crack is likely to occur. On the other hand, in the small diameter shaft portion Wb, the gap between the work W and the cooling jacket 4 is larger than the large diameter shaft portion Wa, and the cooling fluid injected from the cooling jacket 4 tends to diffuse and the cooling efficiency decreases. .

そこで、図３（Ｂ）に示すように、大径軸部Ｗａの冷却における噴射量は、小径軸部Ｗｂの冷却における噴射量よりも少なくされている。それにより、大径軸部Ｗａにおいては、冷却速度を抑えて角部Ｗｃの焼割れを抑制し、小径軸部Ｗｂにおいては、ギャップの拡大に起因する冷却効率の低下を補い、十分な焼入れ硬さを得ることが可能となる。   Therefore, as shown in FIG. 3B, the injection amount for cooling the large diameter shaft portion Wa is smaller than the injection amount for cooling the small diameter shaft portion Wb. Thereby, in the large diameter shaft portion Wa, the cooling rate is suppressed to suppress the quench cracking of the corner portion Wc, and in the small diameter shaft portion Wb, a decrease in the cooling efficiency due to the expansion of the gap is compensated. Can be obtained.

また、加熱コイル２及び冷却ジャケット４の相対移動方向における後側に向けてワークＷの中心軸に斜交する方向に冷却液が噴射される本例において、冷却ジャケット４からワークＷ上における着水箇所までのワークＷの軸方向に沿う距離Ｌは、ワークＷと冷却ジャケット４との間のギャップが大きい小径軸部Ｗｂで長くなる。   Further, in the present example in which the coolant is jetted in a direction oblique to the central axis of the work W toward the rear side in the relative movement direction of the heating coil 2 and the cooling jacket 4, water landing on the work W from the cooling jacket 4 The distance L along the axial direction of the workpiece W up to the location becomes longer at the small diameter shaft portion Wb where the gap between the workpiece W and the cooling jacket 4 is large.

そこで、加熱コイル２及び冷却ジャケット４が角部Ｗｃを越えたタイミングで、加熱コイル２及び冷却ジャケット４の相対移動速度もまた変更され、相対移動速度は、大径軸部Ｗａの冷却よりも小径軸部Ｗｂの冷却において速められている。それにより、小径軸部Ｗｂにおいて加熱から冷却までの時間間隔を短縮し、小径軸部Ｗｂの焼入れの品質を高めることができる。また、ワークＷの焼入れに要する時間を短縮することもできる。   Therefore, at the timing when the heating coil 2 and the cooling jacket 4 exceed the corner Wc, the relative moving speed of the heating coil 2 and the cooling jacket 4 is also changed, and the relative moving speed is smaller than that of the large diameter shaft Wa. The cooling of the shaft portion Wb is accelerated. Thus, the time interval from heating to cooling can be shortened in the small diameter shaft portion Wb, and the quality of the hardening of the small diameter shaft portion Wb can be enhanced. In addition, the time required to quench the workpiece W can be shortened.

そして、小径軸部Ｗｂの冷却における噴射量を多くすることにより、小径軸部Ｗｂの冷却において加熱コイル２及び冷却ジャケット４の相対移動速度を速めることに起因する小径軸部Ｗｂの冷却不足を補うことができる。   Then, by increasing the injection amount for cooling the small diameter shaft portion Wb, insufficient cooling of the small diameter shaft portion Wb caused by increasing the relative moving speed of the heating coil 2 and the cooling jacket 4 in cooling the small diameter shaft portion Wb is compensated. be able to.

以上説明したとおり、本明細書に開示された焼入れ装置は、軸方向に隣設された相対的に太い部位と相対的に細い部位とを有する段付き軸部材の焼入れ装置であって、前記段付き軸部材を誘導加熱する加熱コイルと、前記加熱コイルによって加熱された前記段付き軸部材に冷却液を吹き付ける冷却ジャケットと、前記加熱コイル及び前記冷却ジャケットを一体として、前記加熱コイル及び前記冷却ジャケットと前記段付き軸部材とを前記段付き軸部材の中心軸に沿って相対移動させる駆動部と、を備え、前記冷却ジャケットから噴射される冷却液の単位時間当たりの噴射量が、前記太い部位の冷却と前記細い部位の冷却とで変更される。   As described above, the hardening device disclosed in the present specification is a hardening device for a stepped shaft member having a relatively thick portion and a relatively thin portion provided in the axial direction, A heating coil for induction heating the attached shaft member, a cooling jacket for blowing a coolant onto the stepped shaft member heated by the heating coil, the heating coil and the cooling jacket as one, and the heating coil and the cooling jacket And a drive unit for relatively moving the stepped shaft member along the central axis of the stepped shaft member, wherein the injection amount per unit time of the cooling fluid injected from the cooling jacket is the thick portion And cooling of the narrow portion.

また、本明細書に開示された焼入れ装置は、前記太い部位の冷却における前記噴射量が、前記細い部位の冷却における前記噴射量よりも少ない。   Further, in the hardening device disclosed in the present specification, the injection amount in the cooling of the thick portion is smaller than the injection amount in the cooling of the thin portion.

また、本明細書に開示された焼入れ装置は、前記細い部位の冷却における前記冷却ジャケットの相対移動速度が、前記太い部位の冷却における前記冷却ジャケットの相対移動速度よりも速い。   Further, in the hardening device disclosed in the present specification, the relative moving speed of the cooling jacket in cooling the narrow portion is faster than the relative moving speed of the cooling jacket in cooling the thick portion.

また、本明細書に開示された焼入れ装置は、前記冷却液が、前記加熱コイル及び前記冷却ジャケットの相対移動方向における後側に向けて前記段付き軸部材の中心軸に斜交する方向に噴射される。   Further, in the hardening device disclosed in the present specification, the coolant is injected in the direction oblique to the central axis of the stepped shaft member toward the rear side in the relative movement direction of the heating coil and the cooling jacket. Be done.

また、本明細書に開示された焼入れ方法は、軸方向に隣設された相対的に太い部位と相対的に細い部位とを有する段付き軸部材の焼入れ方法であって、前記段付き軸部材を誘導加熱する加熱コイルと、前記加熱コイルによって加熱された前記段付き軸部材に冷却液を吹き付ける冷却ジャケットと、を一体として、前記加熱コイル及び前記冷却ジャケットと前記段付き軸部材とを前記段付き軸部材の中心軸に沿って相対移動させながら、段付き軸部材の各部を加熱冷却して焼入れし、前記冷却ジャケットから噴射される冷却液の単位時間当たりの噴射量を、前記太い部位の冷却と前記細い部位の冷却とで変更する。   Further, the hardening method disclosed in the present specification is a hardening method of a stepped shaft member having a relatively thick portion and a relatively thin portion provided adjacent to each other in the axial direction, and the stepped shaft member A heating coil for induction heating, and a cooling jacket for blowing a cooling liquid to the stepped shaft member heated by the heating coil, the heating coil, the cooling jacket, and the stepped shaft member being the steps; Each part of the stepped shaft member is heated, cooled, and quenched while being relatively moved along the central axis of the attached shaft member, and the injection amount per unit time of the cooling fluid injected from the cooling jacket is Change between cooling and cooling of the narrow area.

また、本明細書に開示された焼入れ方法は、前記太い部位の冷却における前記噴射量を、前記細い部位の冷却における前記噴射量よりも少なくする。   In the quenching method disclosed in the present specification, the injection amount in the cooling of the thick portion is smaller than the injection amount in the cooling of the thin portion.

また、本明細書に開示された焼入れ方法は、前記細い部位の冷却における前記冷却ジャケットの相対移動速度を、前記太い部位の冷却における前記冷却ジャケットの相対移動速度よりも速くする。   Further, the hardening method disclosed herein makes the relative moving speed of the cooling jacket in cooling the narrow portion faster than the relative moving speed of the cooling jacket in cooling the thick portion.

また、本明細書に開示された焼入れ方法は、前記冷却液を、前記加熱コイル及び前記冷却ジャケットの相対移動方向における後側に向けて前記段付き軸部材の中心軸に斜交する方向に噴射する。   Further, in the quenching method disclosed in the present specification, the coolant is injected in the direction oblique to the central axis of the stepped shaft member toward the rear side in the relative movement direction of the heating coil and the cooling jacket. Do.

１ 焼入れ装置
２ 加熱コイル
３ 電源部
４ 冷却ジャケット
５ 冷却液供給部
６ ワーク支持部
７ 制御部
６２ 駆動部
Ｗ ワーク（段付き軸部材）
Ｗａ 大径軸部（太い部位）
Ｗｂ 小径軸部（細い部位）
Ｗｃ 角部 DESCRIPTION OF SYMBOLS 1 Hardening apparatus 2 Heating coil 3 Power supply part 4 Cooling jacket 5 Coolant supply part 6 Work support part 7 Control part 62 Drive part W Work (shaft member with a step)
Wa Large diameter shaft (thick part)
Wb Small diameter shaft (thin part)
Wc corner

Claims (6)

軸方向に隣設された相対的に太い部位と相対的に細い部位とを有する段付き軸部材の焼入れ装置であって、
前記段付き軸部材を誘導加熱する加熱コイルと、
前記加熱コイルによって加熱された前記段付き軸部材に冷却液を吹き付ける冷却ジャケットと、
前記加熱コイル及び前記冷却ジャケットを一体として、前記加熱コイル及び前記冷却ジャケットと前記段付き軸部材とを前記段付き軸部材の中心軸に沿って相対移動させる駆動部と、
を備え、
前記冷却ジャケットから噴射される冷却液の単位時間当たりの噴射量が、前記太い部位の冷却と前記細い部位の冷却とで変更され、前記太い部位の冷却における前記噴射量は、前記細い部位の冷却における前記噴射量よりも少ない段付き軸部材の焼入れ装置。 A hardening device for a stepped shaft member having a relatively thick portion and a relatively thin portion axially provided adjacent to each other,
A heating coil for inductively heating the stepped shaft member;
A cooling jacket for blowing a cooling fluid to the stepped shaft member heated by the heating coil;
A driving unit that moves the heating coil and the cooling jacket and the stepped shaft member relative to each other along the central axis of the stepped shaft member by integrally forming the heating coil and the cooling jacket;
Equipped with
The injection amount per unit time of the cooling fluid injected from the cooling jacket is changed by the cooling of the thick portion and the cooling of the thin portion, and the injection amount in the cooling of the thick portion is the cooling of the thin portion The quenching apparatus for a stepped shaft member smaller than the injection amount in the above . 請求項１記載の段付き軸部材の焼入れ装置であって、
前記細い部位の冷却における前記冷却ジャケットの相対移動速度は、前記太い部位の冷却における前記冷却ジャケットの相対移動速度よりも速い段付き軸部材の焼入れ装置。 A hardening device for a stepped shaft member according to claim 1 , wherein
The quenching apparatus for a stepped shaft member, wherein the relative moving speed of the cooling jacket in cooling the narrow portion is higher than the relative moving speed of the cooling jacket in cooling the wide portion. 請求項１又は２記載の段付き軸部材の焼入れ装置であって、
前記冷却液は、前記加熱コイル及び前記冷却ジャケットの相対移動方向における後側に向けて前記段付き軸部材の中心軸に斜交する方向に噴射される段付き軸部材の焼入れ装置。 A hardening device for a stepped shaft member according to claim 1 or 2 , wherein
The quenching device for a stepped shaft member, wherein the cooling fluid is injected rearward in the relative movement direction of the heating coil and the cooling jacket in a direction oblique to the central axis of the stepped shaft member. 軸方向に隣設された相対的に太い部位と相対的に細い部位とを有する段付き軸部材の焼入れ方法であって、
前記段付き軸部材を誘導加熱する加熱コイルと、前記加熱コイルによって加熱された前記段付き軸部材の被加熱部位に冷却液を吹き付ける冷却ジャケットと、を一体として、前記加熱コイル及び前記冷却ジャケットと前記段付き軸部材とを前記段付き軸部材の中心軸に沿って相対移動させながら、段付き軸部材の各部を加熱冷却して焼入れし、
前記冷却ジャケットから噴射される冷却液の単位時間当たりの噴射量を、前記太い部位の冷却と前記細い部位の冷却とで変更し、前記太い部位の冷却における前記噴射量を、前記細い部位の冷却における前記噴射量よりも少なくする段付き軸部材の焼入れ方法。 A method of quenching a stepped shaft member having a relatively thick portion and a relatively thin portion provided in the axial direction,
The heating coil and the cooling jacket integrally include a heating coil for induction heating the stepped shaft member, and a cooling jacket for spraying a coolant onto the heated portion of the stepped shaft member heated by the heating coil. While relatively moving the stepped shaft member along the central axis of the stepped shaft member, each portion of the stepped shaft member is heated and cooled and quenched.
The injection amount per unit time of the cooling fluid injected from the cooling jacket is changed between the cooling of the thick portion and the cooling of the thin portion, and the injection amount in the cooling of the thick portion is the cooling of the thin portion The hardening method of the stepped shaft member which makes it smaller than the said injection quantity in 3 . 請求項４記載の段付き軸部材の焼入れ方法であって、
前記細い部位の冷却における前記冷却ジャケットの相対移動速度を、前記太い部位の冷却における前記冷却ジャケットの相対移動速度よりも速くする段付き軸部材の焼入れ方法。 5. The method for quenching a stepped shaft member according to claim 4 , wherein
A hardening method of a stepped shaft member, wherein a relative moving speed of the cooling jacket in cooling the narrow portion is made faster than a relative moving speed of the cooling jacket in cooling the thick portion. 請求項４又は５記載の段付き軸部材の焼入れ方法であって、
前記冷却液を、前記加熱コイル及び前記冷却ジャケットの相対移動方向における後側に向けて前記段付き軸部材の中心軸に斜交する方向に噴射する段付き軸部材の焼入れ方法。 The method of quenching a stepped shaft member according to claim 4 or 5 ,
A hardening method of a stepped shaft member, wherein the cooling fluid is injected rearward in the relative movement direction of the heating coil and the cooling jacket in a direction oblique to the central axis of the stepped shaft member.
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