JPH02194119A - High frequency quenching apparatus - Google Patents
High frequency quenching apparatusInfo
- Publication number
- JPH02194119A JPH02194119A JP1011042A JP1104289A JPH02194119A JP H02194119 A JPH02194119 A JP H02194119A JP 1011042 A JP1011042 A JP 1011042A JP 1104289 A JP1104289 A JP 1104289A JP H02194119 A JPH02194119 A JP H02194119A
- Authority
- JP
- Japan
- Prior art keywords
- impedance
- workpiece
- variation
- oscillator
- hardening
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010791 quenching Methods 0.000 title abstract 5
- 230000000171 quenching effect Effects 0.000 title abstract 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- 230000002159 abnormal effect Effects 0.000 claims abstract description 5
- 230000001939 inductive effect Effects 0.000 claims abstract description 5
- 238000012544 monitoring process Methods 0.000 claims abstract 2
- 230000006698 induction Effects 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000002950 deficient Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
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)
Abstract
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は高周波焼き入れ装置に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to an induction hardening device.
（従来の技術） 周知のように、材料の表面処理の一つとして。(Conventional technology) As is well known, it is one of the surface treatments for materials.
電磁誘導を利用した高周波焼き入れがある。There is induction hardening that uses electromagnetic induction.
すなわち、この高周波焼き入れは、焼き入れしようとす
るワークの周辺にコイルを配置し、ワーク表面に集中し
て流れる高周波電流の抵抗損失によ得られる発熱により
、ワーク表面の温度を上げ、所定温度に達した時点で急
冷してワーク表面内部の組織をマルテンサイト化するよ
うにしたものである。In other words, in this induction hardening, a coil is placed around the workpiece to be hardened, and the heat generated by the resistance loss of the high-frequency current flowing concentratedly on the workpiece surface is used to raise the temperature of the workpiece surface to a predetermined temperature. When this temperature is reached, the workpiece is rapidly cooled to transform the internal structure of the workpiece surface into martensite.
そして、このような高周波焼き入れに際しては。And when it comes to induction hardening like this.
焼き入れの深さを全てのワークにおいて同じ結果が得ら
れるようにすることが必要とされている。It is necessary to adjust the depth of hardening to give the same result on all workpieces.
そこで、従来においては、電源電圧と加熱時間を制御す
ることで、上述した要求を満たすことが行われていた。Therefore, in the past, the above requirements were met by controlling the power supply voltage and heating time.
（発明が解決しようとする課題）
しかしながら、上述したような制御にあっては、ワーク
の寸法上のバラツキや、また、コイル都ワ−ク表面との
距離、あるいはワークの材質の違い等によって、−様な
加熱温度および焼き入れ深さに影響する加熱領域の深さ
に変化を生じるのが現状とされており、結果として、表
面硬度を一定化することができなくなる虞れがあった。(Problems to be Solved by the Invention) However, in the above-mentioned control, due to variations in the dimensions of the workpiece, the distance between the coil and the workpiece surface, or differences in the material of the workpiece, etc. - The current situation is that the heating temperature and the depth of the heating region, which affect the hardening depth, vary, and as a result, there is a risk that the surface hardness cannot be made constant.
そこで１本発明の目的は、上述した高周波焼き入れにお
ける問題に鑑み、全てのワークに対する焼き入れにおい
て−様な焼き入れ深さを設定できる高周波焼き入れ装置
を得ることにある。SUMMARY OF THE INVENTION In view of the above-mentioned problems in induction hardening, an object of the present invention is to provide an induction hardening apparatus that can set various hardening depths for hardening all workpieces.
（課題を解決するための手段）
この目的を達成するため、本発明は、ワーク表面におけ
る高周波電流の抵抗損により、ワーク表面を発熱させて
急冷することでその表面の焼き入れを行う高周波焼き入
れ装置において、上記発熱用のコイルに接続され高周波
電源と、この電源に接続された発振器とを備え、上記発
振器は、上記ワーク側での抵抗と誘導リアクタンスとか
ら得られるインピーダンスの変化を加熱開始時からモニ
タする機能を有し、このインピーダンスの変化を正常な
焼き入れ深さが得られるインピーダンスの変化と対比し
て、その変化が異常状態に達した時点で上記電源から上
記ワークに対して発生させられる電流値をフィードバッ
ク制御できるようにすること提案するものである。(Means for Solving the Problems) In order to achieve this object, the present invention provides induction hardening, which hardens the surface of the workpiece by generating heat and rapidly cooling the surface of the workpiece due to resistance loss of high-frequency current on the surface of the workpiece. The apparatus includes a high-frequency power source connected to the heating coil and an oscillator connected to the power source, and the oscillator converts changes in impedance obtained from the resistance and inductive reactance on the workpiece side at the start of heating. It has a function to monitor the change in impedance from the above, and compares this change in impedance with the change in impedance that would result in a normal hardening depth, and when the change reaches an abnormal state, it generates a signal from the power supply to the workpiece. The proposed method is to enable feedback control of the current value.
（作 用）
本発明によれば、正常な焼き入れ深さにあるかどうかを
モニタリングでき、異常値に達した場合には、加熱状態
を正常な焼き入れ深さが得られる状態に変更することが
できる。(Function) According to the present invention, it is possible to monitor whether or not the hardening depth is at a normal hardening depth, and when an abnormal value is reached, the heating state can be changed to a state where a normal hardening depth can be obtained. Can be done.
（実 施 例）
以下、第１ｒｓ乃至第３図において、本発明実施例の詳
細を説明する。(Embodiment) Hereinafter, details of an embodiment of the present invention will be described with reference to FIGS. 1rs to 3.
第１図は本発明実施例による高周波焼き入れ装置の全体
構成を示すブロック図である。FIG. 1 is a block diagram showing the overall configuration of an induction hardening apparatus according to an embodiment of the present invention.
すなわち、本実施例における焼き入れ装置１は。That is, the hardening apparatus 1 in this embodiment is as follows.
ワーク２における焼き入れ個所の周囲に配置されたコイ
ル３を備え、このコイル３は、発振器４に接続されてい
る。A coil 3 is provided around the hardening location on the workpiece 2, and the coil 3 is connected to an oscillator 4.
上述した発振器４は、第２図示のような回路構成とされ
ており、同図において、符号５はコイル３の抵抗を、同
６，７はコイル３のインピーダンスおよびワーク２との
間の空隙インピーダンスをそれぞれ示している。また、
符号８は高周波電源を示しており、この高周波電源８に
は、ワーク２側での抵抗９と誘導リアクタンスｌＯとが
直列配列されている。The above-mentioned oscillator 4 has a circuit configuration as shown in the second figure, in which reference numeral 5 indicates the resistance of the coil 3, and 6 and 7 indicate the impedance of the coil 3 and the air gap impedance between it and the workpiece 2. are shown respectively. Also,
Reference numeral 8 indicates a high frequency power source, and in this high frequency power source 8, a resistor 9 and an inductive reactance 10 on the workpiece 2 side are arranged in series.
そして、上述した発振器４には、その詳細を図示しない
が、波形によって、ワーク２側でのインピーダンスの変
化をモニタできる例えば、Ｘ−Ｙレコーダ１１（第１図
参照）が接続されている。The oscillator 4 described above is connected to, for example, an X-Y recorder 11 (see FIG. 1) that can monitor changes in impedance on the workpiece 2 side based on waveforms, although details thereof are not shown.
このＸ−Ｙレコーダ１１においては、発振器４を介して
得られるワーク２側のインピーダンスの変化を表示でき
るようになっており、焼き入れされるワーク２のそれぞ
れにサンプリングナンバを設定して、そのワークに対応
したインピーダンスの変化により、焼き入れ深さを判断
できるようになっている。This X-Y recorder 11 is capable of displaying changes in impedance on the workpiece 2 side obtained via an oscillator 4, and a sampling number is set for each workpiece 2 to be hardened. The hardening depth can be determined by the change in impedance corresponding to the change in impedance.
本実施例おいては１例えば、鋳鉄ＣＦＣＤ７０）を材料
とするワークを用い、正常な焼き入れ深さ、所謂、基準
となる深さを２．５鵬とし、この深さに対して、２％過
多になった場合を過剰焼き入れとして組織の変質が起こ
る不良品と判断し、また、２％過少になった場合を焼き
入れ不足としてこれも不良品とするように設定したとす
ると、第３図示のように、それぞれの極限値による焼き
入れ深さが得られる電流を設定するためのインピーダン
スの波形の範囲を許容範囲りとして、この範囲内にモニ
タするインピーダンスがあれば、正常な焼き入れが行わ
れたこととすることができる。なお。In this example, a workpiece made of cast iron CFCD70) is used, and the normal hardening depth, the so-called reference depth, is set to 2.5 mm, and 2% of this depth is used. If it is set to be excessively hardened and judged to be a defective product due to structural deterioration, and if it is set to be 2% too hard to be judged as insufficiently hardened, this is also considered to be a defective product. As shown in the figure, the range of the impedance waveform for setting the current that provides the hardening depth at each extreme value is the permissible range, and if the impedance to be monitored is within this range, normal hardening is possible. It can be assumed that it has been done. In addition.
第３図は焼き入れ時間を横軸に、そして、インピーダン
スの波形、換言すれば、そのインピーダンスによって加
熱されることで得られる焼き入れ深さからの機械的強度
としての硬度を縦軸に示したものである。Figure 3 shows the hardening time on the horizontal axis and the impedance waveform, in other words, the hardness as mechanical strength from the hardening depth obtained by heating with the impedance, on the vertical axis. It is something.
本実施例によれば、ワーク側のインピーダンスの変化に
応じて電源電圧を制御すれば、常に、−様な焼き入れ深
さを得られる高周波電源からの電流印加を可能にするこ
とができる。According to this embodiment, by controlling the power supply voltage according to changes in impedance on the workpiece side, it is possible to always apply current from a high frequency power supply that can obtain a negative hardening depth.
（発明の効果）
以上１本発明によれば、ワーク表面に生じる高周波電流
によって加熱される際に生じるワーク側でのインピーダ
ンスの変化を加熱当初からモニタすることで、得られた
インピーダンスの変化が正常な焼き入れ深さを得られる
状態にあるかを判断できるので、その結果に応じて、常
に−様な焼き入れ深さを設定することが可能になる。(Effects of the Invention) According to the present invention, the change in impedance on the workpiece side that occurs when the workpiece surface is heated by the high-frequency current is monitored from the beginning of heating, so that the change in impedance obtained is normal. Since it is possible to judge whether the condition is such that a certain hardening depth can be obtained, it is possible to always set a negative hardening depth according to the result.
第１図は本発明実施例による高周波焼き入れ装置の全体
構成を示すブロック図、第２図は第１図に示したブロッ
ク図における要部を説明するための回路図、第３図は本
発明実施例の作用を説明するための焼き入れ特性を示す
線図である。
１・・・高周波焼き入れ装置、２・・・ワーク、３・・
・コイル、４・・・発振器、８・・・高周波電源、９・
・・ワーク側での抵抗、１０・・・ワーク側での誘導リ
アクタンス。FIG. 1 is a block diagram showing the overall configuration of an induction hardening apparatus according to an embodiment of the present invention, FIG. 2 is a circuit diagram for explaining the main parts of the block diagram shown in FIG. FIG. 3 is a diagram showing hardening characteristics for explaining the effect of the example. 1...Induction hardening device, 2...Workpiece, 3...
・Coil, 4... Oscillator, 8... High frequency power supply, 9.
...Resistance on the work side, 10...Inductive reactance on the work side.
Claims (1)
ク表面を発熱させて急冷することでその表面の焼き入れ
を行う高周波焼き入れ装置において、上記発熱用のコイ
ルに接続され高周波電源と、この電源に接続された発振
器とを備え、 上記発振器は、上記ワーク側での抵抗と誘導リアクタン
スとから得られるインピーダンスの変化を加熱開始時か
らモニタする機能を有し、このインピーダンスの変化を
正常な焼き入れ深さが得られるインピーダンスの変化と
対比して、その変化が異常状態に達した時点で上記電源
から上記ワークに対して発生させられる電流値をフィー
ドバック制御できることを可能にしたことを特徴とする
高周波焼き入れ装置。[Claims] In an induction hardening device that hardens the surface of a workpiece by generating heat and rapidly cooling it due to resistance loss of high-frequency current on the surface of the workpiece, the device is connected to the heating coil and connected to a high-frequency power source. , and an oscillator connected to this power supply, the oscillator has a function of monitoring changes in impedance obtained from the resistance and inductive reactance on the workpiece side from the start of heating, and detects changes in impedance normally. The present invention is characterized by making it possible to perform feedback control of the current value generated from the power supply to the workpiece at the point when the change reaches an abnormal state in contrast to the change in impedance that allows a hardening depth to be obtained. Induction hardening equipment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1011042A JPH02194119A (en) | 1989-01-20 | 1989-01-20 | High frequency quenching apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1011042A JPH02194119A (en) | 1989-01-20 | 1989-01-20 | High frequency quenching apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02194119A true JPH02194119A (en) | 1990-07-31 |
Family
ID=11766993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1011042A Pending JPH02194119A (en) | 1989-01-20 | 1989-01-20 | High frequency quenching apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02194119A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002317224A (en) * | 2001-04-20 | 2002-10-31 | Denki Kogyo Co Ltd | High frequency quenching method |
| JP2013138036A (en) * | 2007-09-13 | 2013-07-11 | Neturen Co Ltd | Method of determining positional relation between heating coil and work |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5269036A (en) * | 1975-12-05 | 1977-06-08 | Mitsubishi Electric Corp | Controller of inductive heating |
| JPS5546272A (en) * | 1978-09-27 | 1980-03-31 | Toyo Seikan Kaisha Ltd | High frequency induction heating circuit |
| JPS61203590A (en) * | 1985-03-06 | 1986-09-09 | 第一高周波工業株式会社 | Heating of metal strip |
-
1989
- 1989-01-20 JP JP1011042A patent/JPH02194119A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5269036A (en) * | 1975-12-05 | 1977-06-08 | Mitsubishi Electric Corp | Controller of inductive heating |
| JPS5546272A (en) * | 1978-09-27 | 1980-03-31 | Toyo Seikan Kaisha Ltd | High frequency induction heating circuit |
| JPS61203590A (en) * | 1985-03-06 | 1986-09-09 | 第一高周波工業株式会社 | Heating of metal strip |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002317224A (en) * | 2001-04-20 | 2002-10-31 | Denki Kogyo Co Ltd | High frequency quenching method |
| JP4713757B2 (en) * | 2001-04-20 | 2011-06-29 | 電気興業株式会社 | Induction hardening method |
| JP2013138036A (en) * | 2007-09-13 | 2013-07-11 | Neturen Co Ltd | Method of determining positional relation between heating coil and work |
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