JP5026175B2 - Workpiece manufacturing method - Google Patents
Workpiece manufacturing method Download PDFInfo
- Publication number
- JP5026175B2 JP5026175B2 JP2007181914A JP2007181914A JP5026175B2 JP 5026175 B2 JP5026175 B2 JP 5026175B2 JP 2007181914 A JP2007181914 A JP 2007181914A JP 2007181914 A JP2007181914 A JP 2007181914A JP 5026175 B2 JP5026175 B2 JP 5026175B2
- Authority
- JP
- Japan
- Prior art keywords
- workpiece
- frequency coil
- groove
- cooling device
- diameter portion
- 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.)
- Expired - Fee Related
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
Landscapes
- General Induction Heating (AREA)
- Heat Treatment Of Articles (AREA)
Description
本発明は、段差又は溝部を有するワークを高周波焼入れする工程を有するワークの製造方法に関する。特に本発明は、段取り時間を低減して生産性を向上させたワークの製造方法に関する。 The present invention relates to a method for manufacturing a workpiece including a step of induction hardening a workpiece having a step or a groove. In particular, the present invention relates to a workpiece manufacturing method in which the setup time is reduced and the productivity is improved.
ピストンロッドなどのワークは、所定の機械的強度を有する必要がある。このようなワークに所定の機械的強度を持たせる方法として、高周波焼入れがある。ワークに高周波焼入れを行う場合、高周波コイルとワークとの相対位置を移動させることにより、ワークの全面を高周波加熱し、その後冷却する（例えば特許文献１参照）。 A workpiece such as a piston rod needs to have a predetermined mechanical strength. There is induction hardening as a method for giving a predetermined mechanical strength to such a workpiece. When induction hardening is performed on a workpiece, the entire surface of the workpiece is heated at a high frequency by moving the relative position between the high frequency coil and the workpiece, and then cooled (see, for example, Patent Document 1).
例えばワークがピストンロッドなど大径部と小径部を有する部材である場合、大径部と小径部の境界部分に段差が生じる。段差があるワークに一般的な方法で高周波焼入れを行う場合、大径部にあわせた高周波コイルを用いる必要があるため、段差を加熱処理するときに上段部（すなわち大径部の端部）が集中して誘導加熱されてしまい、段差の下段部（すなわち小径部の端部）がＡｃ３点以上に加熱される前に上段部がオーバーヒートしてしまい、結晶粒が粗大化してしまう。 For example, when the workpiece is a member having a large diameter portion and a small diameter portion such as a piston rod, a step is generated at a boundary portion between the large diameter portion and the small diameter portion. When induction hardening is applied to workpieces with a level difference using a general method, it is necessary to use a high frequency coil that matches the large diameter part, so the upper part (that is, the end of the large diameter part) is The heat is concentrated and induction heated, and the upper stage is overheated before the lower part of the step (that is, the end of the small diameter part) is heated to Ac 3 or more points, and the crystal grains become coarse.
この場合、段取り時間の増加により、生産性が低下して量産に適さないという問題があった。このような問題は、ワークの表面に溝が形成されている場合も生じていた。 In this case, there is a problem that the productivity is lowered due to an increase in the setup time and is not suitable for mass production. Such a problem also occurs when a groove is formed on the surface of the workpiece.
本発明は上記のような事情を考慮してなされたものであり、その目的は、段差部又は溝部を有するワークを高周波焼入れする工程を有しており、段取り時間を低減して生産性を向上させたワークの製造方法を提供することにある。 The present invention has been made in consideration of the above-mentioned circumstances, and its purpose is to have a step of induction-hardening a work having a stepped portion or a groove portion, thereby reducing the setup time and improving the productivity. Another object is to provide a method for manufacturing a workpiece.
上記課題を解決するため、本発明に係るワークの製造方法は、ワークを加熱する高周波コイル及び前記ワークを冷却する冷却装置それぞれを、前記ワークの表面に対して相対的に移動させることにより、前記ワークの表層に高周波焼入れする工程を具備し、
前記ワークは表面に、高部、該高部より低い低部、及び前記高部及び前記低部の境界である段差を有し、
前記段差を加熱するときに、前記高周波コイルを前記段差に対向させて前記高周波コイルへの入力をパルス状にして、かつ前記段差を形成する前記高部の端部を前記冷却装置で冷却することを特徴とする。
In order to solve the above-described problem, a method for manufacturing a workpiece according to the present invention includes moving a high-frequency coil that heats a workpiece and a cooling device that cools the workpiece relative to the surface of the workpiece. It has a process of induction hardening on the surface of the workpiece,
The workpiece has, on the surface, a high part, a low part lower than the high part, and a step which is a boundary between the high part and the low part,
When heating the step, the high-frequency coil is opposed to the step, the input to the high-frequency coil is pulsed, and the end of the high part forming the step is cooled by the cooling device It is characterized by.
前記段差を焼入れするときに、前記ワークに対する前記高周波コイル及び前記冷却装置の相対位置を変化させないのが好ましい。前記ワークに高周波焼入れする工程において、前記高周波コイル及び前記冷却装置を、前記高部から前記低部に向かう方向に移動させるのが好ましい。 When quenching the step, it is preferable that the relative positions of the high-frequency coil and the cooling device with respect to the workpiece are not changed. In the step of induction-quenching the workpiece, the high-frequency coil and the cooling device are preferably moved in a direction from the high portion toward the low portion.
前記段差に溝を有していてもよい。また、前記段差を加熱するときに、前記段差に接する前記高部の温度がＡｃ３点より５０℃以上１５０℃未満である所定の温度を越えないように、前記高周波コイルへの入力を制御するのが好ましい。 The step may have a groove. Further, when heating the step, the input to the high-frequency coil is controlled so that the temperature of the high part in contact with the step does not exceed a predetermined temperature that is 50 ° C. or more and less than 150 ° C. from the Ac 3 point. Is preferred.
本発明に係るワークの製造方法は、ワークを加熱する高周波コイル及び前記ワークを冷却する冷却装置それぞれを、前記ワークの表面に対して相対的に移動させることにより、前記ワークの表層に高周波焼入れする工程を具備し、
前記ワークは表面に溝部を有し、
前記溝部を焼入れするときに、前記高周波コイルを前記溝部の上方に配置して前記高周波コイルへの入力をパルス状にして、かつ前記溝部の周囲を前記冷却装置で冷却することを特徴とする。
In the method for manufacturing a workpiece according to the present invention, the high-frequency coil for heating the workpiece and the cooling device for cooling the workpiece are moved relative to the surface of the workpiece, thereby induction-quenching the surface layer of the workpiece. Comprising steps,
The workpiece has a groove on the surface,
When quenching the groove, the high-frequency coil is disposed above the groove so that the input to the high-frequency coil is pulsed, and the periphery of the groove is cooled by the cooling device.
以下、図面を参照して本発明の実施形態について説明する。本実施形態は、高周波焼入れ工程を有するワーク１０の製造方法である。図１は、本発明の実施形態に用いられる高周波焼入れ装置の構成を説明するための概略図である。この高周波焼入れ装置は、筒状又は棒状のワーク１０を高周波焼入れ処理することにより、ワーク１０の表層に硬化層を形成する装置である。ワーク１０は例えばピストンロッドであり、大径部１１、小径部１２、及び大径部１１と小径部１２の境界すなわち段差に設けられた溝部１３を有する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. This embodiment is a manufacturing method of the workpiece | work 10 which has an induction hardening process. FIG. 1 is a schematic diagram for explaining the configuration of an induction hardening apparatus used in an embodiment of the present invention. This induction hardening device is a device that forms a hardened layer on the surface layer of the workpiece 10 by subjecting the cylindrical or rod-like workpiece 10 to induction hardening. The workpiece 10 is, for example, a piston rod, and includes a large diameter portion 11, a small diameter portion 12, and a groove portion 13 provided at a boundary, that is, a step between the large diameter portion 11 and the small diameter portion 12.
この高周波焼入れ装置は、ワーク１０を加熱する高周波コイル２１、ワーク１０を冷却する冷却装置２２、高周波コイル２１に高周波を印加する電源２３、高周波コイル２１及び冷却装置２２を移動させる移動機構２４、並びに制御部２６を有する。高周波コイル２１の内側にはワーク１０が挿通する。冷却装置２２は、ワーク１０の表面に冷却液又はエアーを吹きつけることにより、ワーク１０を冷却する。冷却装置２２は、例えば円筒部材を有しており、この円筒部材の内側にワーク１０が挿通した状態で、ワーク１０の表面に冷却液又はエアーを吹きつける。なお、冷却装置２２及び電源２３は、制御部２６によって制御される。 This induction hardening apparatus includes a high frequency coil 21 that heats the workpiece 10, a cooling device 22 that cools the workpiece 10, a power source 23 that applies a high frequency to the high frequency coil 21, a moving mechanism 24 that moves the high frequency coil 21 and the cooling device 22, and A control unit 26 is included. The workpiece 10 is inserted inside the high frequency coil 21. The cooling device 22 cools the workpiece 10 by spraying a coolant or air on the surface of the workpiece 10. The cooling device 22 has, for example, a cylindrical member, and sprays coolant or air onto the surface of the workpiece 10 in a state where the workpiece 10 is inserted inside the cylindrical member. The cooling device 22 and the power source 23 are controlled by the control unit 26.
移動機構２４は、高周波コイル２１及び冷却装置２２をワーク１０の表面に沿って移動させることにより、高周波コイル２１及び冷却装置２２とワーク１０の相対位置を移動させる。なお移動機構２４は、ワーク１０を移動させることにより、高周波コイル２１及び冷却装置２２とワーク１０の相対位置を移動させてもよい。移動機構２４は、制御部２６によって制御される。 The moving mechanism 24 moves the high frequency coil 21 and the cooling device 22 along the surface of the workpiece 10 to move the relative positions of the high frequency coil 21 and the cooling device 22 and the workpiece 10. The moving mechanism 24 may move the relative positions of the high-frequency coil 21 and the cooling device 22 and the work 10 by moving the work 10. The moving mechanism 24 is controlled by the control unit 26.
図２は、図１に示した高周波焼入れ装置を用いてワーク１０に焼入れする方法を説明するためのチャートである。このチャートにおいて、横軸は高周波コイル２１及び冷却装置２２の位置を、縦軸は処理開始からの時間を、それぞれ示している。本図に示す例において、制御部２６は、高周波コイル２１及び冷却装置２２を、大径部１１側の端部１１ｂから小径部１２側の端部１２ｂまでこの方向に移動させることにより、大径部１１、溝部１３、及び小径部１２の順に焼入れを行う。 FIG. 2 is a chart for explaining a method of quenching the workpiece 10 using the induction hardening apparatus shown in FIG. In this chart, the horizontal axis indicates the positions of the high-frequency coil 21 and the cooling device 22, and the vertical axis indicates the time from the start of processing. In the example shown in the figure, the control unit 26 moves the high-frequency coil 21 and the cooling device 22 in this direction from the end portion 11b on the large-diameter portion 11 side to the end portion 12b on the small-diameter portion 12 side. The part 11, the groove part 13, and the small diameter part 12 are quenched in this order.
大径部１１及び小径部１２を焼入れ処理する場合、制御部２６は高周波コイル２１及び冷却装置２２を、この順に、一定速度でワーク１０の表面に沿って移動させる。このとき、高周波コイル２１と冷却装置２２の間隔を一定にするのが好ましい。 When quenching the large-diameter portion 11 and the small-diameter portion 12, the control unit 26 moves the high-frequency coil 21 and the cooling device 22 along the surface of the workpiece 10 at a constant speed in this order. At this time, it is preferable to make the interval between the high-frequency coil 21 and the cooling device 22 constant.
そして溝部１３を焼入れ処理する場合、制御部２６は、高周波コイル２１が溝部１３の上方に位置し、かつ冷却装置２２が大径部１１のうち段差を形成している端部１１ａの上方又はその近傍に位置するように、これらを停止させる。そして制御部２６は、電源２３を制御して高周波コイル２１への入力をパルス状にして、かつ冷却装置２２を動作させ、冷却液又はエアーを端部１１ａに吹きつけさせる。冷却液又はエアーは、溝部１３の底部にはほとんどかからないが、小径部１２と溝部１３の境界１２ａには少しかかる。このときの高周波コイル２１への入力電圧の変化と、端部１１ａ及び溝部１３の底部それぞれの温度変化の例を、図３に示す。 When quenching the groove 13, the control unit 26 determines that the high-frequency coil 21 is located above the groove 13 and the cooling device 22 is above the end 11 a forming a step in the large-diameter portion 11 or its These are stopped so that they are located in the vicinity. And the control part 26 controls the power supply 23, makes the input to the high frequency coil 21 into a pulse form, operates the cooling device 22, and sprays a coolant or air on the edge part 11a. The coolant or air hardly takes the bottom part of the groove part 13, but takes a little on the boundary 12 a between the small diameter part 12 and the groove part 13. FIG. 3 shows an example of changes in the input voltage to the high-frequency coil 21 at this time and changes in temperature at the ends of the end portions 11a and the grooves 13.
図３に示すように、高周波コイル２１への入力を開始すると、端部１１ａは溝部１３の底部より先行して温度が上昇する。そして端部１１ａの温度がＡｃ３点より５０℃以上１５０℃未満ほど高い所定の温度（図３の例では９５０℃）に達したときに、高周波コイル２１への入力を中断する。中断後、端部１１ａの温度は冷却液又はエアーにより下がるが、溝部１３の底部の温度は伝熱により上昇しつづける。 As shown in FIG. 3, when the input to the high frequency coil 21 is started, the temperature of the end portion 11 a rises ahead of the bottom portion of the groove portion 13. When the temperature of the end portion 11a reaches a predetermined temperature (950 ° C. in the example of FIG. 3) that is higher by 50 ° C. or more and lower than 150 ° C. from the Ac 3 point, the input to the high frequency coil 21 is interrupted. After the interruption, the temperature of the end portion 11a is lowered by the coolant or air, but the temperature of the bottom portion of the groove portion 13 continues to rise due to heat transfer.
その後、高周波コイル２１への入力を再び行う。そして端部１１ａの温度が上記した所定の温度に達した場合に、高周波コイル２１への入力を中断する。このように、冷却装置によって端部１１ａを冷却しつつ、高周波コイル２１への入力を制御してパルス状にすることにより、端部１１ａのオーバーヒートを防ぎつつ、溝部１３の底部の温度をＡｃ３点以上にすることができる。 Thereafter, the input to the high frequency coil 21 is performed again. When the temperature of the end portion 11a reaches the above-described predetermined temperature, the input to the high-frequency coil 21 is interrupted. In this way, by cooling the end portion 11a with the cooling device and controlling the input to the high-frequency coil 21 to form a pulse, the temperature of the bottom portion of the groove portion 13 is reduced to Ac 3 while preventing overheating of the end portion 11a. Can be more than a point.
また図３に示す例では、最初に予熱の為のパルス入力を行い、その後、本加熱のためのパルス入力を行っている。本加熱のためのパルス入力は、予熱の為のパルス入力より入力電圧が高く、かつ時間が短い。また予熱のためのパルス入力も、加熱が進むにつれて時間が短くなっている。 In the example shown in FIG. 3, pulse input for preheating is first performed, and then pulse input for main heating is performed. The pulse input for the main heating has a higher input voltage and a shorter time than the pulse input for preheating. The pulse input for preheating is also shortened as the heating proceeds.
なお、小径部１２と溝部１３の境界１２ａも高周波コイル２１によって加熱され、溝部１３の底部より温度が上昇するが、端部１１ａと同様の理由により、境界１２ａのオーバーヒートが防止される。 The boundary 12a between the small-diameter portion 12 and the groove portion 13 is also heated by the high-frequency coil 21, and the temperature rises from the bottom portion of the groove portion 13. However, overheating of the boundary 12a is prevented for the same reason as the end portion 11a.
そして端部１１ａ及び溝部１３の底部の温度がＡｃ３点以上になった後、制御部２６は、高周波コイル２１及び冷却装置２２を小径部１２側の端部１２ｂに向かって移動させる。これにより端部１１ａ及び溝部１３は冷却装置２２によって冷却され、焼入れされる。 Then, after the temperature of the bottom end 11a and the grooves 13 is equal to or greater than 3 points Ac, the control unit 26 moves the high-frequency coil 21 and the cooling device 22 toward the end 12b of the small diameter portion 12 side. Thereby, the end part 11a and the groove part 13 are cooled by the cooling device 22 and quenched.
そして大径部１１、溝部１３、及び小径部１２の表層をこの順に高周波焼入れした後、大径部１１、溝部１３、及び小径部１２の表層を、高周波コイル２１を用いて焼戻しする。この焼戻しは、例えば小径部１２、溝部１３、及び大径部１１の順に行う。 The surface layers of the large diameter portion 11, the groove portion 13, and the small diameter portion 12 are induction hardened in this order, and then the surface layer of the large diameter portion 11, the groove portion 13, and the small diameter portion 12 is tempered using the high frequency coil 21. This tempering is performed in the order of, for example, the small diameter portion 12, the groove portion 13, and the large diameter portion 11.
以上、本実施形態によれば、大径部１１、小径部１２、及び大径部１１と小径部１２の境界すなわち段差部に設けられた溝部１３を有するワーク１０を、一つの高周波コイル２１を用いた一回の処理で、焼入れすることができる。 As described above, according to this embodiment, the workpiece 10 having the large-diameter portion 11, the small-diameter portion 12, and the groove portion 13 provided in the boundary between the large-diameter portion 11 and the small-diameter portion 12, that is, the step portion, is replaced with one high-frequency coil 21. Quenching can be achieved with a single treatment.
なお、ワーク１０は、大径部１１及び小径部１２を有しているものに限定されず、管状又は棒状の部材の表面に周方向の溝が形成されたものであってもよい。この場合、高周波コイル２１及び冷却装置２２は溝に直交する方向に移動することになる。また、大径部１１及び小径部１２の境界に溝が形成されていなくてもよい。この場合、境界部分には段差のみが形成される。 In addition, the workpiece | work 10 is not limited to what has the large diameter part 11 and the small diameter part 12, The circumferential groove | channel may be formed in the surface of a tubular or rod-shaped member. In this case, the high frequency coil 21 and the cooling device 22 move in a direction orthogonal to the groove. Moreover, the groove | channel does not need to be formed in the boundary of the large diameter part 11 and the small diameter part 12. FIG. In this case, only a step is formed at the boundary portion.
また、上記した実施形態では、溝部１３を焼入れするときに高周波コイル２１及び冷却装置２２を停止させていたが、これらを極低速で動かしても良い。 In the above-described embodiment, the high-frequency coil 21 and the cooling device 22 are stopped when the groove 13 is quenched, but these may be moved at an extremely low speed.
実施形態で示した方法を用いて、ワーク１０を焼入れ処理した。実施例において、ワーク１０は炭素鋼で形成されており、その成分は、質量％で、Ｃ:０．３７％、Ｓｉ：０．２４％、Ｍｎ:１．７４％、Ｐ：０．０２１％、Ｓ：０．０１５％、ＣＵ：０．０１％、Ｎｉ：０．０２％、Ｃｒ：０．４７％、残部がＦｅ及び不可避的不純物である。
溝部１３を焼入れ処理するときには、端部１１ａの温度が９５０℃を超えないように、高周波コイル２１へのパルス入力を行った。具体的には、６回のパルス入力を行った。パルス幅を、最初のパルスから順に、１０秒、６秒、５秒、５秒、１．５秒、１．５秒とした。これらパルスの相互間隔（すなわち高周波入力を行わない時間）を３秒とした。各パルスにおける入力電圧を、予熱である最初の４パルスを２５０Ｖとして、本加熱である残りの２パルスを４００Ｖとした。
The workpiece 10 was quenched using the method described in the embodiment. In an Example, the workpiece | work 10 is formed with the carbon steel, The component is the mass%, C: 0.37%, Si: 0.24%, Mn: 1.74%, P: 0.021% , S: 0.015%, CU: 0.01%, Ni: 0.02%, Cr: 0.47%, the balance being Fe and inevitable impurities.
When quenching the groove 13, a pulse was input to the high-frequency coil 21 so that the temperature of the end 11 a did not exceed 950 ° C. Specifically, 6 pulse inputs were performed. The pulse width was set to 10 seconds, 6 seconds, 5 seconds, 5 seconds, 1.5 seconds, and 1.5 seconds in order from the first pulse. The mutual interval between these pulses (that is, the time during which high frequency input is not performed) was 3 seconds. The input voltage in each pulse was set to 250V for the first 4 pulses that were preheating and 400V for the remaining 2 pulses that were main heating.
図４の各図は、ワーク１０の組織写真である。図４（Ａ）は大径部１１の本体の組織写真であり、図４（Ｂ）は大径部１１の端部１１ａの組織写真であり、図４（Ｃ）は大径部１１と小径部１２が形成する段差の垂直部分の組織写真であり、図４（Ｄ）は溝部１３の組織写真であり、図４（Ｅ）は小径部１２と溝部１３の境界１２ａの組織写真である。図４（Ａ），（Ｄ）に示すように、大径部１１の本体及び溝部１３の底部の結晶粒は微細であり、１０視野の平均結晶粒度はそれぞれ８．９、９．８であった。また図４（Ｂ），（Ｃ），（Ｅ）に示すように、端部１１ａ、段差の垂直部分、及び小径部１２と溝部１３の境界１２ａでは、溝部１３の底部と比較して結晶粒はやや大きかったが、１０視野の平均結晶粒度はそれぞれ７．２、７．８、７．５と十分小さかった。なお、溝部１３を他の部分と同様に処理した場合（すなわち高周波コイル２１及び冷却装置２２を移動させながら処理した場合）、端部１１ａ、及び小径部１２と溝部１３の境界における結晶粒度は、４程度になる。 Each diagram in FIG. 4 is a structure photograph of the workpiece 10. 4A is a structural photograph of the main body of the large diameter portion 11, FIG. 4B is a structural photograph of the end portion 11a of the large diameter portion 11, and FIG. 4C is a large diameter portion 11 and a small diameter. 4D is a structure photograph of the vertical portion of the step formed by the portion 12, FIG. 4D is a structure photograph of the groove portion 13, and FIG. 4E is a structure photograph of the boundary 12a between the small diameter portion 12 and the groove portion 13. As shown in FIGS. 4A and 4D, the main body of the large-diameter portion 11 and the crystal grains at the bottom of the groove portion 13 are fine, and the average crystal grain sizes in 10 fields of view are 8.9 and 9.8, respectively. It was. Further, as shown in FIGS. 4B, 4C, and 4E, the crystal grains are compared with the end portion 11a, the vertical portion of the step, and the boundary 12a between the small diameter portion 12 and the groove portion 13 as compared with the bottom portion of the groove portion 13. Although it was slightly large, the average grain sizes in the 10 fields of view were sufficiently small at 7.2, 7.8, and 7.5, respectively. When the groove 13 is processed in the same manner as other portions (that is, when the high frequency coil 21 and the cooling device 22 are moved), the crystal grain size at the end 11a and the boundary between the small diameter portion 12 and the groove portion 13 is 4 or so.
図５（Ａ）は、大径部１１の本体（グラフ１）、端部１１ａ（グラフ２）、及び溝部１３の底部（グラフ３，４）それぞれにおける深さ方向のビッカース硬度分布を示している。詳細には、図５（Ｂ）に示すように、グラフ１は、大径部１１の表面から垂直な方向の硬度分布を示しており、グラフ２は、端部１１ａから、ワーク１０の表面に対して４５°を成す方向の硬度分布を示しており、グラフ３は、溝部１３の底部から斜め４５°方向の硬度分布を示しており、グラフ４は、溝部１３の底部から、小径部１２側に１５°ほど垂直方向から傾いた方向の硬度分布を示している。 FIG. 5A shows the Vickers hardness distribution in the depth direction at the main body (graph 1) of the large diameter portion 11, the end portion 11a (graph 2), and the bottom portion (graphs 3 and 4) of the groove portion 13, respectively. . Specifically, as shown in FIG. 5 (B), the graph 1 shows the hardness distribution in the direction perpendicular to the surface of the large diameter portion 11, and the graph 2 shows the surface of the workpiece 10 from the end portion 11a. The graph 3 shows the hardness distribution in the direction of 45 °, and the graph 3 shows the hardness distribution in the direction of 45 ° obliquely from the bottom of the groove 13, and the graph 4 shows the small diameter 12 side from the bottom of the groove 13. Shows the hardness distribution in a direction inclined from the vertical direction by about 15 °.
これらのグラフに示すように、大径部１１の本体では、深さ４ｍｍまでＨＶ６００前後の硬化層が形成されていた。そして溝部１３の底部では、大径部１１側に４５°ほど傾いた方向には深さ６．３ｍｍまでＨＶ６００前後の硬化層が形成されており、小径部１２側に１５°ほど傾いた方向には深さ２．７ｍｍまでＨＶ６００前後の硬化層が形成されていた。また、端部１１ａでは深さ２ｍｍまでＨＢ６００前後の硬化層が形成されていた。 As shown in these graphs, in the main body of the large diameter portion 11, a hardened layer of about HV600 was formed up to a depth of 4 mm. At the bottom of the groove 13, a hardened layer of about HV600 is formed to a depth of 6.3 mm in a direction inclined by 45 ° toward the large diameter portion 11, and in a direction inclined by about 15 ° toward the small diameter portion 12. A hardened layer of around HV600 was formed up to a depth of 2.7 mm. Further, a hardened layer of around HB600 was formed up to a depth of 2 mm at the end 11a.
以上より、上記した実施形態でワーク１０を処理することにより、溝部１３及び端部１１ａのいずれにも十分な深さの硬化層を形成できることが示された。 From the above, it has been shown that by processing the workpiece 10 in the above-described embodiment, a hardened layer having a sufficient depth can be formed in both the groove portion 13 and the end portion 11a.
尚、本発明は上述した実施形態に限定されるものではなく、本発明の主旨を逸脱しない範囲内で種々変更して実施することが可能である。 Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
１０…ワーク、１１…大径部（高部）、１１ａ，１１ｂ，１２ｂ…端部、１２…小径部（低部）、１２ａ…境界、１３…溝部、２１…高周波コイル、２２…冷却装置、２３…電源、２４…移動機構、２６…制御部 DESCRIPTION OF SYMBOLS 10 ... Work, 11 ... Large diameter part (high part), 11a, 11b, 12b ... End part, 12 ... Small diameter part (low part), 12a ... Boundary, 13 ... Groove part, 21 ... High frequency coil, 22 ... Cooling device, 23 ... Power supply, 24 ... Movement mechanism, 26 ... Control unit
Claims (5)
前記ワークは表面に、高部、該高部より低い低部、及び前記高部及び前記低部の境界である段差を有し、
前記段差を加熱するときに、前記高周波コイルを前記段差に対向させて前記高周波コイルへの入力をパルス状にして、かつ前記段差を形成する前記高部の端部を前記冷却装置で冷却することを特徴とするワークの製造方法。 A step of induction-quenching the surface layer of the workpiece by moving each of the high-frequency coil for heating the workpiece and the cooling device for cooling the workpiece relative to the surface of the workpiece;
The workpiece has, on the surface, a high part, a low part lower than the high part, and a step which is a boundary between the high part and the low part,
When heating the step, the high-frequency coil is opposed to the step, the input to the high-frequency coil is pulsed, and the end of the high part forming the step is cooled by the cooling device A method for manufacturing a workpiece characterized by the above.
前記ワークは表面に溝部を有し、
前記溝部を焼入れするときに、前記高周波コイルを前記溝部の上方に配置して前記高周波コイルへの入力をパルス状にして、かつ前記溝部の周囲を前記冷却装置で冷却することを特徴とするワークの製造方法。 A step of induction-quenching the surface layer of the workpiece by moving each of the high-frequency coil for heating the workpiece and the cooling device for cooling the workpiece relative to the surface of the workpiece;
The workpiece has a groove on the surface,
When quenching the groove, the high-frequency coil is disposed above the groove, the input to the high-frequency coil is pulsed, and the periphery of the groove is cooled by the cooling device. Manufacturing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007181914A JP5026175B2 (en) | 2007-07-11 | 2007-07-11 | Workpiece manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2007181914A JP5026175B2 (en) | 2007-07-11 | 2007-07-11 | Workpiece manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2009019230A JP2009019230A (en) | 2009-01-29 |
| JP5026175B2 true JP5026175B2 (en) | 2012-09-12 |
Family
ID=40359131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2007181914A Expired - Fee Related JP5026175B2 (en) | 2007-07-11 | 2007-07-11 | Workpiece manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP5026175B2 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5722025B2 (en) * | 2010-12-27 | 2015-05-20 | 高周波熱錬株式会社 | Induction quenching apparatus and induction quenching method |
| CN105274305A (en) * | 2014-07-20 | 2016-01-27 | 安庆市亿豪工贸发展有限公司 | Heat treatment method for piston rod |
| JP6438734B2 (en) * | 2014-10-29 | 2018-12-19 | 高周波熱錬株式会社 | Work heating and quenching methods |
| JP6427391B2 (en) * | 2014-11-11 | 2018-11-21 | 高周波熱錬株式会社 | Hardening device and hardening method |
| CN114350926A (en) * | 2022-01-13 | 2022-04-15 | 湖南南方宇航高精传动有限公司 | Shaft induction quenching induction coil and processing method |
| WO2024057406A1 (en) * | 2022-09-13 | 2024-03-21 | 日本製鉄株式会社 | Mobile hardening method and mobile hardening device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3164539B2 (en) * | 1997-08-22 | 2001-05-08 | 富士電子工業株式会社 | Induction hardening equipment |
| JP2000303119A (en) * | 1999-04-16 | 2000-10-31 | Fuji Electronics Industry Co Ltd | Induction hardening apparatus and induction hardening method |
| JP2002371317A (en) * | 2001-06-19 | 2002-12-26 | Fuji Electronics Industry Co Ltd | Device and method for induction hardening of axial workpiece |
-
2007
- 2007-07-11 JP JP2007181914A patent/JP5026175B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2009019230A (en) | 2009-01-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5026175B2 (en) | Workpiece manufacturing method | |
| JP6194526B2 (en) | Method and apparatus for heating plate workpiece and hot press molding method | |
| JP6211364B2 (en) | Heat treatment method for ring member and heat treatment equipment for ring member | |
| JP6211366B2 (en) | Heat treatment method for ring member and heat treatment equipment for ring member | |
| US10590502B2 (en) | Method for induction surface hardening of a ring surface | |
| JP2009203498A (en) | High frequency-induction heating method, heating apparatus and bearing | |
| JP6211365B2 (en) | Heat treatment method for ring-shaped member | |
| US3596037A (en) | Apparatus for inductively heat-treating steel workpieces | |
| JP5534492B2 (en) | Carbon tool steel strip manufacturing method | |
| JP2003183735A5 (en) | ||
| JP2015010238A (en) | Heat treatment method | |
| JP5489325B2 (en) | High frequency induction heating method and high frequency induction heating apparatus | |
| JP5274762B2 (en) | Heat treatment method | |
| JP6630577B2 (en) | Quenching method | |
| JP2006028589A (en) | Hardening and tempering method with direct electric-conduction hardening apparatus | |
| JP6438734B2 (en) | Work heating and quenching methods | |
| JP2008105099A (en) | Heat treatment method, manufacturing method, and manufacturing equipment for steel material | |
| JP2020204081A (en) | Quenching apparatus | |
| JP2007231367A (en) | Heat treatment method and device | |
| JP2007262461A (en) | Method and apparatus for induction-heating using stepwise heating | |
| JP2006083411A (en) | Induction heat treatment device, induction heat treatment method, and wrought product manufactured with the method | |
| JP6276941B2 (en) | Heat treatment method and induction heating coil | |
| RU2025538C1 (en) | Strengthening method for surfaces of steel articles of small weight | |
| JPH07138647A (en) | Method for refining crystal grain size of carburizing hardened parts | |
| JPH11140536A (en) | High frequency hardening method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20100511 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20120531 |
|
| 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: 20120605 |
|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20120620 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20150629 Year of fee payment: 3 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| LAPS | Cancellation because of no payment of annual fees |