JPH0514765B2 - - Google Patents
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- Publication number
- JPH0514765B2 JPH0514765B2 JP1259158A JP25915889A JPH0514765B2 JP H0514765 B2 JPH0514765 B2 JP H0514765B2 JP 1259158 A JP1259158 A JP 1259158A JP 25915889 A JP25915889 A JP 25915889A JP H0514765 B2 JPH0514765 B2 JP H0514765B2
- Authority
- JP
- Japan
- Prior art keywords
- workpiece
- length
- hardened
- hardening
- workpieces
- 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 - Lifetime
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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
- Heat Treatment Of Articles (AREA)
Description
【発明の詳細な説明】
＜産業上の利用分野＞
本発明は、長手方向の長さのみが異なり、この
長さ以外は同じ寸法を有するほぼ軸状の複数の被
焼入物体（以下、ワークと記す）の表面を焼入す
る高周波焼入方法に関する。Detailed Description of the Invention <Industrial Application Field> The present invention is directed to a plurality of substantially axial objects to be hardened (hereinafter referred to as workpieces) that differ only in length in the longitudinal direction and have the same dimensions except for this length. It relates to an induction hardening method for hardening the surface of
＜従来の技術＞
従来、上記のようなワークの表面を焼入する場
合には、長さが等しいワーク毎に専用コイルを使
用して一発焼入を行つている。従つて、或る長さ
のワークを焼入して後、異なつた長さのワークを
焼入するには、段取換え、コイルの交換および焼
入条件の設定を行つている。<Prior Art> Conventionally, when hardening the surface of a workpiece as described above, one-shot hardening is performed using a dedicated coil for each workpiece of equal length. Therefore, after hardening a workpiece of a certain length, in order to harden a workpiece of a different length, setup changes, coil replacement, and hardening condition settings are performed.
＜考案が解決しようとする課題＞
即ち、ワークの長さに応じた高周波加熱コイル
をその都度製作する必要があつた。従つて、コイ
ルのコストが増加する。また、段取換えの時間お
よびコイル交換の時間がかかり、高周波焼入作業
時間の短縮の妨げとなつていた。更に、ワークを
長さによつて選別する必要があるが、ワークの長
さに僅かしか差がない場合には、その選別にも時
間がかかり、自動焼入機においては、その選別機
構をも設けなければならなかつた。<Problem to be solved by the invention> In other words, it was necessary to manufacture a high-frequency heating coil according to the length of the workpiece each time. Therefore, the cost of the coil increases. In addition, it takes time to change the setup and replace the coil, which hinders shortening of the induction hardening operation time. Furthermore, it is necessary to sort the workpieces by length, but if there is only a slight difference in the length of the workpieces, sorting takes time, and automatic hardening machines do not have a sorting mechanism. It had to be established.
なお、このようなワークに移動焼入を行えば、
移動焼入用の高周波加熱コイルは１個で済むが、
コイルへ通電する高周波電流をオン・オフするリ
ミツタの調整がその都度必要であり、且つ、ワー
クが段付きシヤフトのような場合には段付き部の
焼入が不十分となつて品質低下を招く。 In addition, if moving hardening is performed on such a work,
Only one high-frequency heating coil is required for moving hardening,
It is necessary to adjust the limiter that turns on and off the high-frequency current that flows to the coil each time, and if the workpiece is a stepped shaft, the hardening of the stepped part will be insufficient, resulting in a decrease in quality. .
本発明は上記事情に鑑みて創案されたものであ
つて、長手方向の長さのみが異なり、この長さ以
外は同じ寸法を有するほぼ軸状の複数のワークを
焼入するに際して、段取換えとコイルの交換を必
要とせず、従つて、ワークを長さによつて選別す
る必要もなく、同一設定条件で焼入できる高周波
焼入方法を提供することを目的としている。 The present invention has been devised in view of the above-mentioned circumstances, and it is possible to change the setup when hardening a plurality of substantially axial-shaped workpieces that differ only in length in the longitudinal direction and have the same dimensions except for this length. It is an object of the present invention to provide an induction hardening method that does not require replacing the coil and the workpiece, and therefore does not require sorting the workpieces by length, and can be hardened under the same setting conditions.
＜課題を解決するための手段＞
上記問題を解決するために本発明の高周波焼入
方法は、長手方向の長さのみが異なり、この長さ
以外は同じ寸法を有するほぼ軸状の複数の被焼入
物体の周面を焼入する高周波焼入方法において、
被焼入物体の一方の端面に絶縁物を押し付けてか
ら、被焼入物体を長手方向の軸を中心として回転
させながら、被焼入物体の周面の形状にほぼ対応
し且つ被焼入物体の最大長さに対応するように形
成されていると共に、被焼入物体のほぼ両側に対
向するように配置された加熱導体に高周波電流を
通電するようにしている。<Means for Solving the Problems> In order to solve the above problems, the induction hardening method of the present invention uses a plurality of substantially axial-shaped coatings that differ only in length in the longitudinal direction and have the same dimensions except for this length. In the induction hardening method of hardening the peripheral surface of a hardened object,
After pressing an insulator onto one end surface of the object to be hardened, the object to be hardened is rotated around the longitudinal axis until the object is shaped almost correspondingly to the shape of the circumferential surface of the object to be hardened. A high-frequency current is applied to the heating conductor, which is formed to correspond to the maximum length of the heating conductor and is arranged to face substantially both sides of the object to be hardened.
＜作 用＞
絶縁物が、加熱導体間に配置された長いワーク
の端面に押し付けられ、ワークが回転される。加
熱導体に高周波電流を通電すると、ワークの表面
は誘導電流によつて加熱され、次いで冷却液が噴
射されてワークの表面に硬化層が形成される。次
いで、短いワークに対しても同様にして同一の高
周波加熱コイルによつて硬化層が形成される。<Function> The insulator is pressed against the end face of a long workpiece placed between the heating conductors, and the workpiece is rotated. When a high frequency current is passed through the heating conductor, the surface of the workpiece is heated by the induced current, and then a cooling liquid is sprayed to form a hardened layer on the surface of the workpiece. Next, a hardened layer is formed on a short workpiece in the same manner using the same high-frequency heating coil.
＜実施例＞
以下、図面を参照して本考案の第１の実施例を
説明する。<Example> Hereinafter, a first example of the present invention will be described with reference to the drawings.
第１図に示した円柱状のワーク２０は、このワ
ークの長手方向の長さがａであり、端面２１に溝
２２が形成されている。第２図に示した円柱状の
ワーク３０の長手方向の長さは、ａより短いｂで
あつて、端面３１には、溝３２が形成されてい
る。ワーク２０と３０とは、長手方向の長さが異
なつているのみで、その他の寸法、即ち、直径の
寸法ｄや、溝２２，３２等の寸法は同一である。 The cylindrical work 20 shown in FIG. 1 has a longitudinal length a, and a groove 22 is formed in an end surface 21. The length b in the longitudinal direction of the cylindrical workpiece 30 shown in FIG. 2 is shorter than a, and a groove 32 is formed in the end surface 31. The works 20 and 30 differ only in length in the longitudinal direction, and other dimensions, such as the diameter d and the dimensions of the grooves 22 and 32, are the same.
ワーク２０および３０を焼入する高周波加熱コ
イル１０は、第３図に示すように、ワーク２０の
表面２３の形状にほぼ対応するように形成され、
且つ対向するように配置された一対の加熱導体１
１および１２と、加熱導体１１および１２のそれ
ぞれの一端を接続するほぼ半円形状の接続導体１
３と、他端に接続された一対のほぼ1/4円弧状の
電源側導体１４および１５とを備えている。 The high-frequency heating coil 10 for hardening the workpieces 20 and 30 is formed to approximately correspond to the shape of the surface 23 of the workpiece 20, as shown in FIG.
A pair of heating conductors 1 arranged to face each other
1 and 12 and a substantially semicircular connecting conductor 1 that connects one end of each of the heating conductors 11 and 12.
3, and a pair of power supply side conductors 14 and 15 each having a substantially 1/4 arc shape and connected to the other end.
加熱導体１１，１２、接続導体１３、電源側導
体１４および１５は、中空四角柱の良電導金属製
であつて、加熱導体１１および１２の長さl1は、
ワークの中で最も長いワークの長さに対応した長
さに設定されている。 The heating conductors 11 and 12, the connection conductor 13, and the power supply side conductors 14 and 15 are made of hollow rectangular prisms made of highly conductive metal, and the length l 1 of the heating conductors 11 and 12 is as follows:
The length is set to correspond to the length of the longest workpiece among the workpieces.
７０は、絶縁支持部７２と、この絶縁支持部７
２の一端に固定され、ワーク２０の端面２１に押
し付けられるセラミツク（例えば窒化珪素等）等
の絶縁物７１とから構成された構成物であつて、
その一端は図示しないセンター軸、或いは、回転
駆動装置に取り付けられている。絶縁支持部７２
は、絶縁物７１と同様のセラミツク製等であつて
も良いし、或いは、ステンレス鋼、軟鋼等であつ
ても、或いは、銅、真鍮であつても良い。絶縁物
７１の先端には、絶縁物７１がワーク２０の端面
２１に押し付けられた場合に、溝２２に挿入され
る突起７４が形成されている。また、絶縁物７１
はワーク２０の端面２１に押し付けられた状態で
ワーク２０が回転してもスリツプしない構造とな
つている。 70 is an insulating support part 72 and this insulating support part 7
2, and an insulating material 71 such as ceramic (for example, silicon nitride) that is pressed against the end surface 21 of the workpiece 20,
One end thereof is attached to a center shaft (not shown) or a rotational drive device. Insulating support part 72
may be made of ceramic, etc. similar to the insulator 71, or may be made of stainless steel, mild steel, etc., or may be made of copper, brass, etc. A protrusion 74 is formed at the tip of the insulator 71 to be inserted into the groove 22 when the insulator 71 is pressed against the end surface 21 of the workpiece 20 . In addition, the insulator 71
has a structure that does not slip even when the work 20 rotates while being pressed against the end surface 21 of the work 20.
次に、ワーク２０の焼入を説明する。 Next, hardening of the workpiece 20 will be explained.
第１図に示すように、高周波加熱コイル１０の
加熱導体１１および１２にワーク２０の表面２３
が対向するようにワーク２０を配置する。ワーク
２０の一端（第１図上で下端）は図示しない回転
駆動装置に取り付けられ、次いで他端の端面２１
には、図示しないセンター軸に取り付けられた構
成物７０が移送されてきて、構成物７０の絶縁物
７１がワーク２０の端面２１に押し付けられ、絶
縁物７１が端面２１に密着する。そして、前記回
転装置によつてワーク２０が回転される。この状
態で高周波加熱コイル１０に高周波電流を所定時
間通電すると、ワーク２０の表面２３に誘導電流
が流れて加熱される。次いで、図示しない冷却ジ
ヤケツトから冷却液をワーク２０に噴射すると、
第１図に示すように、硬化層２４が形成される。 As shown in FIG. 1, the heating conductors 11 and 12 of the high-frequency heating coil 10 are
The workpieces 20 are arranged so that they face each other. One end of the workpiece 20 (the lower end in FIG. 1) is attached to a rotation drive device (not shown), and then the end surface 21 of the other end
, the component 70 attached to a center shaft (not shown) is transferred, and the insulator 71 of the component 70 is pressed against the end surface 21 of the workpiece 20, so that the insulator 71 comes into close contact with the end surface 21. Then, the workpiece 20 is rotated by the rotation device. When a high-frequency current is applied to the high-frequency heating coil 10 for a predetermined period of time in this state, an induced current flows to the surface 23 of the workpiece 20 and heats it. Next, when a cooling liquid is injected onto the workpiece 20 from a cooling jacket (not shown),
As shown in FIG. 1, a hardened layer 24 is formed.
次に、ワーク２０の焼入を行つた後、ワーク３
０の焼入を行う場合を説明する。 Next, after hardening the workpiece 20, the workpiece 3
The case where 0 hardening is performed will be explained.
第２図に示すように、高周波加熱コイル１０の
加熱導体１１および１２にワーク３０の表面３３
が対向するようにワーク３０を配置する。ワーク
３０の一端（第２図上で下端）は図示しない回転
駆動装置に取り付けられ、次いで他端の端面３１
には、図示しないセンター軸に取り付けられた構
成物７０が移送されてきて、絶縁物７１がワーク
３０の端面３１に押し付けられ、絶縁物７１が端
面３１に密着する。そして、前記回転装置によつ
てワーク３０が回転される。この上態で高周波加
熱コイル１０に高周波電流を所定時間通電する
と、ワーク３０の表面３３に誘導電流が流れて加
熱される。次いで、図示しない冷却ジヤケツトか
ら冷却液をワーク３０に噴射すると、第２図に示
すように硬化層３４が形成される。 As shown in FIG. 2, the heating conductors 11 and 12 of the high-frequency heating coil 10 are
The workpieces 30 are arranged so that they face each other. One end of the workpiece 30 (lower end in FIG. 2) is attached to a rotation drive device (not shown), and then the end surface 31 of the other end
, the component 70 attached to the center shaft (not shown) is transferred, and the insulator 71 is pressed against the end surface 31 of the workpiece 30, so that the insulator 71 comes into close contact with the end surface 31. Then, the workpiece 30 is rotated by the rotation device. When a high-frequency current is applied to the high-frequency heating coil 10 for a predetermined period of time in this state, an induced current flows to the surface 33 of the workpiece 30 and heats it. Next, when a cooling liquid is injected onto the workpiece 30 from a cooling jacket (not shown), a hardened layer 34 is formed as shown in FIG.
このように、長手方向の長さのみが異なり、こ
の長さ以外は同じ寸法を有するワーク２０と３０
に対して、同一の高周波加熱コイル１０で同一設
定条件で焼入することができる。 In this way, the workpieces 20 and 30 differ only in length in the longitudinal direction and have the same dimensions except for this length.
However, hardening can be performed using the same high-frequency heating coil 10 under the same setting conditions.
次に本発明の第２の実施例を説明する。 Next, a second embodiment of the present invention will be described.
第４図に示すように、一端にフランジ５９を有
するほぼ軸状のワーク５０は、このワークの長手
方向の長さがｃであり、他端の端面５３に溝５４
が形成されている。このワーク５０は、長さｍで
直径寸法がｅである大径部分５１と、この大径部
分５１と一体形成され長さｎ、直径寸法ｆの小径
部分５２とを具備している。 As shown in FIG. 4, a substantially axial workpiece 50 having a flange 59 at one end has a length c in the longitudinal direction, and a groove 54 in an end surface 53 at the other end.
is formed. The workpiece 50 includes a large diameter portion 51 having a length m and a diameter e, and a small diameter portion 52 integrally formed with the large diameter portion 51 and having a length n and a diameter f.
第５図に示すように、一端にフランジ６９を有
するほぼ軸状のワーク６０の長手方向の長さは、
ｃより短いｄであつて、他端の端面６３には、溝
６４が形成されている。ワーク６０は、ワーク５
０と長手方向の長さのみ、即ち、小径部分５２の
長さn′のみが、ワーク５０と異なつているのみ
で、その他の寸法、即ち、フランジの寸法、大径
部分６１の長さｍ、直径の寸法ｅ、小径部分６２
の直径の寸法ｆ、溝６４の寸法等はワーク５０と
同じである。 As shown in FIG. 5, the length in the longitudinal direction of a substantially axial workpiece 60 having a flange 69 at one end is
A groove 64 is formed in the end surface 63 at the other end, which is shorter than c. Work 60 is work 5
0 and only the length in the longitudinal direction, that is, the length n' of the small diameter portion 52, is different from the workpiece 50, and the other dimensions, that is, the dimension of the flange, the length m of the large diameter portion 61, Diameter dimension e, small diameter portion 62
The diameter dimension f, the dimension of the groove 64, etc. are the same as those of the workpiece 50.
ワーク５０および６０を焼入する高周波加熱コ
イル４０は、第６図に示すように、ワーク５０の
表面５５の形状にほぼ対応するように形成され、
且つ対向するように配置された一対の加熱導体４
１および４２と、加熱導体４１および４２のそれ
ぞれの一端を接続するほぼ半円形状の接続導体４
３と、他端に接続された一対のほぼ1/4円形状の
電源側導体４４および４５とを備えている。 The high-frequency heating coil 40 for hardening the workpieces 50 and 60 is formed to approximately correspond to the shape of the surface 55 of the workpiece 50, as shown in FIG.
A pair of heating conductors 4 arranged to face each other
1 and 42 and a substantially semicircular connecting conductor 4 connecting one end of each of the heating conductors 41 and 42.
3, and a pair of approximately 1/4 circular power supply side conductors 44 and 45 connected to the other end.
加熱導体４１，４２、接続導体４３、電源側導
体４４および４５は、中空四角柱の良電導金属製
であつて、加熱導体４１および４２の長さl2は、
ワークの中で最も長いワークの長さに対応した長
さに設定されている。 The heating conductors 41 and 42, the connection conductor 43, and the power supply side conductors 44 and 45 are made of a hollow rectangular prism made of highly conductive metal, and the length l 2 of the heating conductors 41 and 42 is as follows:
The length is set to correspond to the length of the longest workpiece among the workpieces.
ワーク５０の焼入、およびこの後のワーク６０
の焼入は、高周波加熱コイル４０と構成物７０と
を用いて、第１の実施例のワーク２０および３０
の焼入と同じ要領で行うことができるの。そし
て、ワーク５０，６０に、それぞれ、第４図およ
び第５図に示す硬化層５６，６６が形成される。 Hardening of workpiece 50 and subsequent workpiece 60
The workpieces 20 and 30 of the first embodiment are hardened using the high-frequency heating coil 40 and the component 70.
It can be done in the same way as quenching. Then, hardened layers 56 and 66 shown in FIGS. 4 and 5 are formed on the works 50 and 60, respectively.
上記実施例で説明した構成物７０は、絶縁物７
１と絶縁支持部７２とを備えているが、第７図に
示すように、構成物７０全体を絶縁性の物質で形
成してもよい。 The structure 70 explained in the above embodiment is an insulator 7
1 and an insulating support part 72, the entire structure 70 may be formed of an insulating material, as shown in FIG.
なお、構成物７０を全て金属製にしても理論的
には上記実施例と同様な効果を得ることができる
が、この場合には、この金属とワークとの接触面
でスパークが発生してワークが損傷を受ける。更
に、加熱導体１１，１２の長さがワークに対して
長すぎると、硬化層は部分的に異常に深く形成さ
れたり、ワークの深部まで形成される。また、加
熱導体１１，１２の長さが短すぎると、形成され
た硬化層には、焼き逃げ範囲が広くなる（焼入さ
れない範囲が広くなる）。従つて、構成物７０を
全て金属製とすることなく、絶縁物７１を使用す
ることが必要である。 Note that even if the component 70 is made entirely of metal, it is theoretically possible to obtain the same effect as in the above embodiment, but in this case, sparks are generated at the contact surface between the metal and the workpiece, and the workpiece is is damaged. Furthermore, if the lengths of the heating conductors 11 and 12 are too long relative to the workpiece, the hardened layer may be partially formed to be abnormally deep or may be formed deep into the workpiece. Moreover, if the lengths of the heating conductors 11 and 12 are too short, the formed hardened layer will have a wide range of burnout (the range that is not hardened will be wide). Therefore, it is necessary to use the insulator 71 without making the entire structure 70 metal.
＜発明の効果＞
以上説明したように本発明の高周波焼入方法
は、長手方向の長さのみが異なり、この長さ以外
は同じ寸法を有するほぼ軸状の複数の被焼入物体
の周面を焼入する高周波焼入方法において、被焼
入物体の一方の端面に絶縁物を押し付けてから、
被焼入物体を長手方向の軸を中心として回転させ
ながら、被焼入物体の周面の形状にほぼ対応し且
つ被焼入物体の最大長さに対応するように形成さ
れていると共に、被焼入物体のほぼ両側に対向す
るように配置された加熱導体に高周波電流を通電
する。<Effects of the Invention> As explained above, the induction hardening method of the present invention applies to the peripheral surfaces of a plurality of substantially axial objects to be hardened, which differ only in length in the longitudinal direction and have the same dimensions except for this length. In the induction hardening method, an insulator is pressed against one end surface of the object to be hardened, and then
While the object to be hardened is rotated about a longitudinal axis, the shape of the object to be hardened is formed to approximately correspond to the shape of the circumferential surface of the object to be hardened, and corresponds to the maximum length of the object to be hardened. A high-frequency current is applied to heating conductors placed so as to face substantially both sides of the hardened object.
従つて、本発明の高周波焼入方法によれば、複
数のワークに対して、長さの異なるワークがアト
ランダムにローデイングしてきても、ワークの選
別が不要で、同一設定条件で焼入できる。しか
も、一つの高周波加熱コイルを準備すればよいか
ら、ワークを焼入するに際して、段取換えとコイ
ルの交換を必要とせず、従つて、ワークを長さに
よつて選別する必要もなくすることが可能とな
り、高周波加熱コイルの製作コストが低減できる
と共に、焼入作業時間を短縮することができる。 Therefore, according to the induction hardening method of the present invention, even if a plurality of workpieces of different lengths are randomly loaded, there is no need to sort the workpieces, and the workpieces can be hardened under the same setting conditions. Moreover, since it is only necessary to prepare one high-frequency heating coil, there is no need to change the setup or replace the coil when hardening the workpiece, and there is no need to sort the workpieces by length. This makes it possible to reduce the manufacturing cost of the high-frequency heating coil and shorten the quenching time.
第１図〜第３図は本発明の第１の実施例を説明
するための図面であつて、第１図および第２図は
高周波加熱コイル、ワークおよび構成物の断面図
であり、第１図はワークが長い場合、第２図は短
い場合を示す。第３図は高周波加熱コイルの斜視
図である。第４図〜第６図は本発明の第２の実施
例を説明するための図面であつて、第４図および
第５図は高周波加熱コイル、ワークおよび構成物
の断面図であり、第４図はワークが長い場合、第
５図は短い場合を示す。第６図は高周波加熱コイ
ルの斜視図である。第７図は、第１図、第２図、
第４図および第５図に示した絶縁物を構成物全体
に採用した場合の説明図である。
１０，４０…高周波加熱コイル、１１，１２，
４１，４２…加熱導体、２０，３０，５０，６０
…ワーク、２３，３３，５５，６５…表面、７１
…絶縁物、ａ，ｂ，ｃ，ｄ…長さ。
1 to 3 are drawings for explaining a first embodiment of the present invention, and FIGS. 1 and 2 are cross-sectional views of a high-frequency heating coil, a workpiece, and a structure. The figure shows the case where the work is long, and Figure 2 shows the case where the work is short. FIG. 3 is a perspective view of the high frequency heating coil. 4 to 6 are drawings for explaining the second embodiment of the present invention, and FIGS. The figure shows the case where the work is long, and FIG. 5 shows the case where the work is short. FIG. 6 is a perspective view of the high frequency heating coil. Figure 7 shows Figure 1, Figure 2,
FIG. 5 is an explanatory diagram when the insulator shown in FIGS. 4 and 5 is employed for the entire structure. 10, 40...High frequency heating coil, 11, 12,
41, 42...Heating conductor, 20, 30, 50, 60
...Work, 23, 33, 55, 65...Surface, 71
...Insulator, a, b, c, d...length.
Claims (1)
は同じ寸法を有するほぼ軸状の複数の被焼入物体
の周面を焼入する高周波焼入方法において、 被焼入物体の一方の端面に絶縁物を押し付けて
から、被焼入物体を長手方向の軸を中心として回
転させながら、被焼入物体の周面の形状にほぼ対
応し且つ被焼入物体の最大長さに対応するように
形成されていると共に、被焼入物体のほぼ両側に
対向するように配置された加熱導体に高周波電流
を通電することを特徴とする高周波焼入方法。[Claims] 1. In an induction hardening method for hardening the circumferential surfaces of a plurality of substantially axial objects to be hardened that differ only in length in the longitudinal direction and have the same dimensions except for this length, After pressing an insulator onto one end surface of the object to be hardened, rotate the object to be hardened around the longitudinal axis until the shape approximately corresponds to the circumferential surface of the object to be hardened and the maximum shape of the object to be hardened is pressed. An induction hardening method characterized by passing a high frequency current through a heating conductor that is formed to correspond to the length of the object and is arranged to face substantially both sides of an object to be hardened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1259158A JPH03120317A (en) | 1989-10-03 | 1989-10-03 | High-frequency quenching method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1259158A JPH03120317A (en) | 1989-10-03 | 1989-10-03 | High-frequency quenching method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03120317A JPH03120317A (en) | 1991-05-22 |
| JPH0514765B2 true JPH0514765B2 (en) | 1993-02-25 |
Family
ID=17330153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1259158A Granted JPH03120317A (en) | 1989-10-03 | 1989-10-03 | High-frequency quenching method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03120317A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002101098A1 (en) * | 2000-03-01 | 2002-12-19 | Komatsu Ltd. | Crawler bushing and method and device for producing the same |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2502127Y2 (en) * | 1991-10-04 | 1996-06-19 | 富士電子工業株式会社 | Semi-open type high frequency heating coil for stepped shaft |
| JP4674932B2 (en) | 2000-03-01 | 2011-04-20 | 株式会社小松製作所 | Crawler belt bush, manufacturing method and manufacturing apparatus thereof |
| CN107739793B (en) * | 2017-12-11 | 2019-08-09 | 中核（天津）机械有限公司 | Quenching apparatus for elongate shaft |
-
1989
- 1989-10-03 JP JP1259158A patent/JPH03120317A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002101098A1 (en) * | 2000-03-01 | 2002-12-19 | Komatsu Ltd. | Crawler bushing and method and device for producing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03120317A (en) | 1991-05-22 |
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