JPH0235009B2 - WAAKUNOKINITSUKANETSUHOHOOYOBYUDOKANETSUSOCHI - Google Patents
WAAKUNOKINITSUKANETSUHOHOOYOBYUDOKANETSUSOCHIInfo
- Publication number
- JPH0235009B2 JPH0235009B2 JP14994082A JP14994082A JPH0235009B2 JP H0235009 B2 JPH0235009 B2 JP H0235009B2 JP 14994082 A JP14994082 A JP 14994082A JP 14994082 A JP14994082 A JP 14994082A JP H0235009 B2 JPH0235009 B2 JP H0235009B2
- Authority
- JP
- Japan
- Prior art keywords
- workpiece
- induction heating
- coil
- heating
- contact
- 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
Links
- 238000010438 heat treatment Methods 0.000 claims description 72
- 230000006698 induction Effects 0.000 claims description 38
- 238000000034 method Methods 0.000 claims description 9
- 230000004907 flux Effects 0.000 claims description 7
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000000295 complement effect Effects 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
Description
【発明の詳細な説明】
本発明は、ワークの均一加熱方法と誘導加熱装
置に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for uniformly heating a workpiece and an induction heating apparatus.
全長に亘つて同一径を有する誘導加熱コイルを
用いて、例えば、中央が大径部で両端側が小径部
である軸状のワークを誘導加熱して焼入れする場
合には、ワークと誘導加熱コイルとの対向間隙が
小径部より小さい大径部に生ずる誘導電流が小径
部のそれより大となる為に、該大径部が他部より
速く昇温してワークがその長手方向に不均一加熱
されるという問題がある。そのうえ誘導加熱コイ
ルのコイル長がワーク長より十分長くない場合に
は、誘導加熱コイルの端部に生ずる磁束の漏洩に
よつてワーク両端近くの部分の加熱効果が低下す
る為、上記不均一加熱が一層、助長されるという
問題があつた。この磁束漏洩によるワークの不均
一加熱はワークが全長に亘つて同一径であるよう
な場合にも勿論同様である。 For example, when induction heating and hardening a shaft-shaped workpiece with a large diameter part at the center and small diameter parts at both ends using an induction heating coil that has the same diameter over its entire length, the workpiece and the induction heating coil Since the induced current generated in the large diameter part, where the facing gap is smaller than that in the small diameter part, is larger than that in the small diameter part, the temperature of the large diameter part rises faster than other parts, and the workpiece is heated unevenly in the longitudinal direction. There is a problem that Furthermore, if the coil length of the induction heating coil is not sufficiently longer than the workpiece length, the heating effect near both ends of the workpiece will decrease due to leakage of magnetic flux that occurs at the ends of the induction heating coil, resulting in the non-uniform heating described above. The problem was that it was further encouraged. Of course, the non-uniform heating of the workpiece due to magnetic flux leakage also occurs when the workpiece has the same diameter over its entire length.
本発明は、上記した従来の問題点に鑑みてなさ
れたもので、誘導加熱コイルに通電される電流の
全部もしくは一部をワークにも通電し、誘導加熱
による昇温特性を抵抗加熱による昇温特性で補償
する構成とすることにより、誘導加熱コイルの構
造を複雑にすることなくワークを均一に加熱する
ことができ、しかも力率や加熱効率を高めること
ができるワークの均一加熱方法及び誘導加熱装置
を提供することを目的とする。 The present invention has been made in view of the above-mentioned conventional problems, and involves passing all or part of the current passed through the induction heating coil to the workpiece, thereby replacing the temperature rise characteristic caused by induction heating with the temperature rise characteristic achieved by resistance heating. A method for uniformly heating a workpiece and induction heating that can heat the workpiece uniformly without complicating the structure of the induction heating coil and increase the power factor and heating efficiency by having a configuration that compensates based on the characteristics. The purpose is to provide equipment.
以下、本発明の一実施例を図について説明す
る。 Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
第１図において、１は交流電源、２は力率改善
用コンデンサ、３ａ，３ｂは電源端子、４ａ，４
ｂ，４ｃ、はリード、５は全長に亘つて同一径を
持つ誘導加熱コイル、６は金属材料で作られたワ
ークである。このワークは中央の大径部６１から
両端側の部分が小径部６２，６３である異径軸状
物であつて、一方端面及び他方端面が夫々接触子
７ａ，７ｂを介して誘導加熱コイル５の一端及び
交流電源１の電源端子３ｂに接続されている。 In Fig. 1, 1 is an AC power supply, 2 is a power factor correction capacitor, 3a, 3b are power supply terminals, 4a, 4
b, 4c are leads, 5 is an induction heating coil having the same diameter over the entire length, and 6 is a workpiece made of a metal material. This workpiece is a shaft-like object with different diameters, from a central large-diameter part 61 to small-diameter parts 62 and 63 on both ends, and one end surface and the other end surface are connected to induction heating coils via contacts 7a and 7b, respectively. It is connected to one end of the AC power supply 1 and the power supply terminal 3b of the AC power supply 1.
本実施例では、誘導加熱コイル５とワーク６と
が直列になつているので、該ワーク６は誘導電流
による誘導加熱と、接触子７ａ，７ｂ間を通して
直接ワーク自身を流れる電流による抵抗加熱の複
合加熱を受ける。 In this embodiment, since the induction heating coil 5 and the workpiece 6 are connected in series, the workpiece 6 undergoes a combination of induction heating by an induced current and resistance heating by a current flowing directly through the workpiece itself through the contacts 7a and 7b. undergoes heating.
誘導電流による加熱作用は、誘導加熱コイル５
に対するワーク６の間隙が小径部６２，６３に比
し大径部６１が大であるので該大径部６１を他部
より速く昇温せしめる。 The heating effect due to the induced current is caused by the induction heating coil 5.
Since the gap between the workpiece 6 and the large diameter portion 61 is larger than that of the small diameter portions 62 and 63, the temperature of the large diameter portion 61 is increased faster than other portions.
これに対し、直接電流による加熱作用は、小径
部６２，６３の抵抗値が大径部６３の抵抗値より
大であるので、該小径部６２，６３を他部より速
く昇温せしめる。 On the other hand, the heating action by direct current raises the temperature of the small diameter portions 62, 63 faster than other portions because the resistance value of the small diameter portions 62, 63 is greater than the resistance value of the large diameter portion 63.
このように、誘導加熱によるワーク６の昇温特
性と抵抗加熱によるワーク６の昇温特性とが互い
に補完的になるので、上記複合加熱による場合
は、昇温速度がワーク６全長に亘つて均等化さ
れ、ワーク６は誘導加熱だけの場合よりも均一に
加熱される。 In this way, the temperature increase characteristics of the workpiece 6 due to induction heating and the temperature increase characteristics of the workpiece 6 due to resistance heating are complementary to each other, so when using the above-mentioned combined heating, the temperature increase rate is uniform over the entire length of the workpiece 6. , and the workpiece 6 is heated more uniformly than when only induction heating is used.
この複合加熱による加熱の均一性は電流値を調
整、制御することによつて、高めることができる
が、その他の方法として接触子７ａ，７ｂの接触
抵抗を積極的に利用するようにしてもよい。この
場合は、ワーク６の両端面と接触子７ａ，７ｂの
接触面との間の接触抵抗を大きくすれば、ワーク
６両端部の発熱量が増大し昇温速度が速められる
ので、誘導加熱コイル５が持つ前記した漏洩磁束
による低い発熱効果及びワーク６の端部が受ける
放熱作用による加熱不均一を補償して、より均一
性を高めることができる。 The uniformity of heating by this composite heating can be increased by adjusting and controlling the current value, but as another method, the contact resistance of the contacts 7a and 7b may be actively utilized. . In this case, if the contact resistance between both end surfaces of the workpiece 6 and the contact surfaces of the contacts 7a and 7b is increased, the amount of heat generated at both ends of the workpiece 6 will increase and the temperature increase rate will be accelerated, so the induction heating coil It is possible to compensate for the low heat generation effect caused by the leakage magnetic flux of the workpiece 5 and the uneven heating caused by the heat dissipation effect exerted on the end portion of the workpiece 6, thereby further improving uniformity.
次に、ワーク６の加熱均一性を高める為の他の
電流制御方法の一例を第２図について説明する。 Next, an example of another current control method for improving the heating uniformity of the workpiece 6 will be explained with reference to FIG.
第２図において、誘導加熱コイル５０は内側の
第１コイル５１と外側の第２コイル５２からなる
２重巻きコイルとして構成され、第２コイル５２
の一端側及び他端側には切換タツプ５２Ａ，５２
Ｂが夫々設けられている。第１コイル５１の一端
は電源端子３ａに接続され、他端は第２コイル５
２の同側端に接続されており、第２コイル５２の
タツプ５２Ａは接触子７ａを介してワーク６の一
端に、又タツプ５２Ｂは接触子７ｂを介してワー
ク６の他端に接続されている。 In FIG. 2, the induction heating coil 50 is configured as a double-wound coil consisting of an inner first coil 51 and an outer second coil 52.
Switching taps 52A, 52 are provided on one end side and the other end side.
B are provided respectively. One end of the first coil 51 is connected to the power supply terminal 3a, and the other end is connected to the second coil 5.
The tap 52A of the second coil 52 is connected to one end of the workpiece 6 via the contactor 7a, and the tap 52B of the second coil 52 is connected to the other end of the workpiece 6 via the contactor 7b. There is.
この回路構成では、タツプ５２Ａ−第２コイル
５２の一端間、タツプ５２Ｂ−第２コイル５２の
他端間には内側コイル５１に流れる電流と同じ値
の電流が流れるが、第２コイル５２のタツプ５２
Ａと５２Ｂ間の部分はワーク６と並列である為に
第１コイル５１の電流より小さい電流が流れる。
従つて、誘導加熱コイル５０の、ワーク小径部６
２，６３を取巻いている部分に流れる電流がワー
ク大径部６１を取巻いている部分に流れる電流よ
り大である為、各ターンに同一電流が流れる第１
図の誘導加熱コイル５による場合に比してワーク
６が均一に誘導加熱され、これに抵抗加熱による
補完効果が加わり、かつタツプ５２Ａ，５２Ｂの
切り換えによつて自由調節ができるのでワーク６
の加熱の均一性は一層高められる。この誘導加熱
コイル５０は、大径部６１と小径部６２，６３の
径差が大きいワーク６を焼入れ処理する場合に好
適である。 In this circuit configuration, a current having the same value as the current flowing through the inner coil 51 flows between the tap 52A and one end of the second coil 52 and between the tap 52B and the other end of the second coil 52; 52
Since the portion between A and 52B is parallel to the workpiece 6, a current smaller than the current of the first coil 51 flows therethrough.
Therefore, the workpiece small diameter portion 6 of the induction heating coil 50
Since the current flowing in the part surrounding the workpiece large diameter part 61 is larger than the current flowing in the part surrounding the workpiece large diameter part 61, the same current flows in each turn.
Compared to the induction heating coil 5 shown in the figure, the workpiece 6 is induction-heated more uniformly, the complementary effect of resistance heating is added to this, and the workpiece 6 can be freely adjusted by switching the taps 52A and 52B.
The uniformity of heating is further improved. This induction heating coil 50 is suitable for hardening a workpiece 6 in which the diameter difference between the large diameter portion 61 and the small diameter portions 62 and 63 is large.
上記実施例では、ワークが異径軸状物である場
合について説明したが、ワークが全長に亘つて同
一径の軸状物や管状体である場合も、電流値を調
整するとともにタツプ調節をし、かつ併用する抵
抗加熱によつて誘導加熱コイル端部の漏洩磁束効
果や前記放熱作用による加熱不均一を、殆んど解
消することができる。 In the above example, the case where the workpiece is a shaft-like object with different diameters has been explained, but when the workpiece is a shaft-like object or a tubular object with the same diameter over the entire length, the current value and the tap adjustment can also be applied. , and by using resistance heating in combination, it is possible to almost eliminate the leakage magnetic flux effect at the end of the induction heating coil and the non-uniform heating caused by the heat dissipation effect.
第３図は、本発明を管８の内面加熱に実施する
場合を示す。図において、５０′は誘導加熱コイ
ルである。この場合、管８の一つの端面に接触さ
せる接触子は環状体または板状体９，９′を用い
る。 FIG. 3 shows the case in which the invention is implemented for internal heating of the tube 8. In the figure, 50' is an induction heating coil. In this case, the contactor brought into contact with one end surface of the tube 8 is an annular body or a plate-shaped body 9, 9'.
以上の如く、本発明によれば、誘導加熱コイル
に流れる電流の一部もしくは全部をワークに導い
て誘導加熱と抵抗加熱との複合加熱を行う構成と
したことにより、ワークが異径ワークである場合
には、誘導加熱による昇温特性と抵抗加熱による
昇温特性とが互いに補完的となるので、ワークを
全長に亘つて均一に加熱することができ、かつ加
熱コイル端部の漏洩磁束や放熱による不均一加熱
も是正することができワークが全長に亘つて同一
径のものである場合にも、誘導加熱コイル端部の
漏洩磁束と放熱とによる加熱不均一度を抵抗加熱
で低減させることができる。しかも、電気回路上
は、誘導加熱だけの場合とくらべて、ワークの抵
抗値と、該ワーク接触子との接触抵抗値だけ抵抗
分が増えるので、従来に比して力率を改善し、加
熱効率を高めることができる利点がある。 As described above, according to the present invention, a part or all of the current flowing through the induction heating coil is guided to the workpiece to perform combined heating of induction heating and resistance heating, so that the workpiece has a different diameter. In some cases, the temperature increase characteristics of induction heating and resistance heating are complementary to each other, making it possible to uniformly heat the workpiece over its entire length, while reducing leakage magnetic flux and heat dissipation at the ends of the heating coil. Even if the workpiece has the same diameter over its entire length, resistance heating can reduce the uneven heating caused by leakage magnetic flux and heat radiation at the end of the induction heating coil. can. Moreover, on the electric circuit, the resistance increases by the resistance value of the workpiece and the contact resistance value with the workpiece contactor compared to the case of only induction heating, so the power factor is improved compared to the conventional method, and the heating It has the advantage of increasing efficiency.
第１図は本発明によるワークの均一加熱方法及
び誘導加熱装置の実施例の回路図、第２図は本発
明の他の実施例の回路図、第３図は本発明の他の
実施例の回路図である。
５，５０，５０′……誘導加熱コイル、７ａ，
７ｂ，９，９′……接触子、５１……内側コイル、
５２……外側コイル、５２Ａ，５２Ｂ……切換タ
ツプ。
FIG. 1 is a circuit diagram of an embodiment of the workpiece uniform heating method and induction heating device according to the present invention, FIG. 2 is a circuit diagram of another embodiment of the present invention, and FIG. 3 is a circuit diagram of another embodiment of the present invention. It is a circuit diagram. 5, 50, 50'...induction heating coil, 7a,
7b, 9, 9'... contact, 51... inner coil,
52...Outer coil, 52A, 52B...Switching tap.
Claims (1)
て、軸状もしくは管状ワークの誘導加熱を行う場
合において、上記誘導加熱コイルに流れる電流の
全部もしくは一部を上記ワークに導いて誘導加熱
によるワーク昇温特性を抵抗加熱によるワーク昇
温特性で補償せしめることを特徴とするワークの
均一加熱方法。 ２ ワークと、該ワーク両端面に夫々当接される
接触子との間の接触抵抗による発熱量を調整して
誘導加熱コイル端部の洩れ磁束による発熱量の低
下を補償することを特徴とする特許請求の範囲第
１項記載のワークの均一加熱方法。 ３ ワークが管状をなす場合において、ワーク端
面に当接される接触子が環状または板状であるこ
とを特徴とする特許請求の範囲第１項及び第２項
記載のワークの均一加熱方法。 ４ 同心に巻回され直列接続された第１コイルと
第２コイルからなり、一方のコイルにはワークの
一端に接触子を介して接続される切換タツプとワ
ークの他端に接触子を介して接続される切換タツ
プを設けた全長に亘つて同一径の誘導加熱コイル
を具える誘導加熱装置。[Claims] 1. When induction heating a axial or tubular workpiece using an induction heating coil having the same diameter over its entire length, all or part of the current flowing through the induction heating coil is directed to the workpiece. A method for uniformly heating a workpiece, the method comprising: compensating the workpiece temperature increase characteristic due to induction heating with the workpiece temperature increase characteristic due to resistance heating. 2. It is characterized by adjusting the amount of heat generated due to the contact resistance between the workpiece and the contact elements that are in contact with both end surfaces of the workpiece to compensate for the decrease in the amount of heat generated due to the leakage magnetic flux at the end of the induction heating coil. A method for uniformly heating a workpiece according to claim 1. 3. The method for uniformly heating a workpiece according to claims 1 and 2, wherein when the workpiece is tubular, the contact that comes into contact with the end surface of the workpiece is ring-shaped or plate-shaped. 4 Consisting of a first coil and a second coil that are concentrically wound and connected in series, one coil has a switching tap connected to one end of the workpiece via a contact, and a switching tap connected to the other end of the workpiece via a contact. An induction heating device comprising an induction heating coil of the same diameter over its entire length and provided with a switching tap to be connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14994082A JPH0235009B2 (en) | 1982-08-31 | 1982-08-31 | WAAKUNOKINITSUKANETSUHOHOOYOBYUDOKANETSUSOCHI |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14994082A JPH0235009B2 (en) | 1982-08-31 | 1982-08-31 | WAAKUNOKINITSUKANETSUHOHOOYOBYUDOKANETSUSOCHI |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5941418A JPS5941418A (en) | 1984-03-07 |
| JPH0235009B2 true JPH0235009B2 (en) | 1990-08-08 |
Family
ID=15485886
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14994082A Expired - Lifetime JPH0235009B2 (en) | 1982-08-31 | 1982-08-31 | WAAKUNOKINITSUKANETSUHOHOOYOBYUDOKANETSUSOCHI |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0235009B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2611628B1 (en) * | 1987-02-26 | 1990-11-30 | Bendix France | BRAKE CORRECTOR SERVO-LOADED BY A VEHICLE |
| KR20130037207A (en) | 2010-06-11 | 2013-04-15 | 유니버시티 오브 윈저 | Magnetic and electrical processing of metals, metal alloys, metal matrix composite parts and components |
-
1982
- 1982-08-31 JP JP14994082A patent/JPH0235009B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5941418A (en) | 1984-03-07 |
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| JP3451650B2 (en) | High frequency heating method for cylindrical members |