JPH08225828A - Flame hardening device for steam turbine moving blade and flame hardening - Google Patents
Flame hardening device for steam turbine moving blade and flame hardeningInfo
- Publication number
- JPH08225828A JPH08225828A JP2647495A JP2647495A JPH08225828A JP H08225828 A JPH08225828 A JP H08225828A JP 2647495 A JP2647495 A JP 2647495A JP 2647495 A JP2647495 A JP 2647495A JP H08225828 A JPH08225828 A JP H08225828A
- Authority
- JP
- Japan
- Prior art keywords
- flame
- steam turbine
- water surface
- blade
- tip
- 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
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、蒸気タービン動翼先端
部における蒸気の入口端を焼入れするようにした蒸気タ
ービン動翼のフレームハードニング装置及びフレームハ
ードニング方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam turbine blade flame hardening device and a flame hardening method for quenching a steam inlet end of a steam turbine rotor blade.
【０００２】[0002]
【従来の技術】蒸気タービン動翼、特に低圧段落動翼入
口端は蒸気の流れ中に混在する水滴の衝突によりエロー
ジョン損失が発生する。このエロージョン対策として、
従来から動翼入口端に動翼材料と異なるステライト等の
高硬度の材料を取り付ける処理が行われている。この方
法は、効果が確実であるが高硬度材の取り付け処理とし
て溶接や銀ろう付け等の方法が取られているため、動翼
本体に高硬度材の取り付け用溝等の複雑な機械加工や比
較的高価で加工の難しい高硬度材の準備が必要となる。
また、この取り付け用溝や高硬度材の形状の設計や製作
が難しく、異種金属の溶接により品質が低下することが
ある。2. Description of the Related Art An erosion loss occurs at a steam turbine rotor blade, particularly at a low pressure stage rotor blade inlet end due to collision of water droplets mixed in a steam flow. As a countermeasure against this erosion,
Conventionally, a process of attaching a high hardness material such as stellite, which is different from the moving blade material, to the moving blade inlet end has been performed. Although this method has a certain effect, since methods such as welding and silver brazing are used for attaching the high hardness material, complicated machining such as grooves for attaching the high hardness material to the rotor blade body and It is necessary to prepare a high hardness material that is relatively expensive and difficult to process.
Further, it is difficult to design and manufacture the mounting groove and the shape of the high hardness material, and the quality may be deteriorated due to the welding of dissimilar metals.
【０００３】そこで、これに代わる耐エロージョン対策
として、動翼入口端を火炎焼き入れし、動翼本体の高硬
度が必要な部分のみの硬度を上げるフレームハードニン
グも実用化されている。通常、このフレームハードニン
グは動翼を冷却用の水中で保持し、高硬度が必要な動翼
前縁のみ水面上に突出させた部分で高硬度を必要としな
い部分に直接火炎が当たらぬよう養生を行い火炎焼き入
れを行うものである。これは、異種金属の溶接がなく、
また施工の自動化に適しているため製品の大幅な品質向
上となる。Therefore, as an alternative measure against erosion, frame hardening has been put into practical use in which the inlet end of the moving blade is flame-hardened to increase the hardness of only the portion of the moving blade body where high hardness is required. Normally, this frame hardening keeps the moving blades in the water for cooling, and only the leading edge of the moving blades that need high hardness is projected above the water surface so that the flame does not hit directly the parts that do not need high hardness. It is cured and flame-hardened. This is because there is no welding of dissimilar metals,
Also, it is suitable for automation of construction, which greatly improves the quality of products.
【０００４】[0004]
【発明が解決しようとする課題】ところが、このフレー
ムハードニングの施工においては焼入れ部の温度管理が
難しく、温度管理が不十分な場合には、目標とする硬度
範囲に収まらないことがある。また、焼入れ部分の寸法
確保が難しい。However, it is difficult to control the temperature of the hardened portion in the frame hardening process, and if the temperature control is insufficient, the hardness may not fall within the target hardness range. Moreover, it is difficult to secure the dimensions of the quenched portion.
【０００５】これは、フレームハードニング施工時の条
件として火炎焼き入れ時の燃焼ガスと酸素との割合、圧
力と温度、火炎トーチの形状や動翼との距離、移動速度
さらに冷却水温度と供給量や水面からの焼き入れ部突出
量、水面の焼き入れを行わない部分に直接火炎が当たら
ぬよう養生のために設けた火炎遮蔽板の形状や厚さな
ど、多くの要因が重なるためである。This is because the conditions of flame hardening are as follows: ratio of combustion gas and oxygen during flame quenching, pressure and temperature, flame torch shape and distance to moving blades, moving speed, and cooling water temperature and supply. This is because many factors such as the amount and amount of the quenching part protruding from the water surface, the shape and thickness of the flame shield plate provided for curing so that the flame does not directly hit the non-quenched part of the water surface, etc. .
【０００６】また、各施工条件を一定にしても焼入れ部
分の寸法、特に入口端の幅方向寸法が一定にならないこ
とが経験されている。このことは水面から突出させた部
分が必ずしも焼き入れ部分とはならないことを示してい
る。Further, it has been experienced that the dimensions of the hardened portion, particularly the widthwise dimension of the inlet end, are not constant even if the respective working conditions are constant. This means that the part projected from the water surface does not necessarily become the quenched part.
【０００７】この現象の主な原因は、図１２に示すよう
に、火炎トーチ４からの火炎６がＡ部のように冷却水の
水面３を押し退けるために、動翼１の冷却状態が変化す
ることと、火炎トーチ４の移動と共に水面３の高さが変
化することである。なお、図１２中、７は動翼支持具で
ある。また、図１３に示すように、動翼１の水面３から
出ていて焼入れを行わない部分には、直接火炎６が当た
らぬよう養生のために火炎遮蔽板１１を設けているが、
図１４に示すように、この火炎遮蔽板１１の形状によ
り、火炎トーチ４からの火炎６の流れがＢ，Ｃ部のよう
に変化し、動翼１と火炎遮蔽板１１の境界部付近に火炎
６が回りにくくなり、焼入れ部分が減少することになる
からである。The main cause of this phenomenon is that, as shown in FIG. 12, the flame 6 from the flame torch 4 pushes the water surface 3 of the cooling water away like the portion A, so that the cooling state of the moving blade 1 changes. That is, the height of the water surface 3 changes as the flame torch 4 moves. In addition, in FIG. 12, 7 is a moving blade support. Further, as shown in FIG. 13, a flame shield plate 11 is provided for curing so that the flame 6 does not directly hit the portion of the rotor blade 1 that is out of the water surface 3 and is not quenched.
As shown in FIG. 14, due to the shape of the flame shield plate 11, the flow of the flame 6 from the flame torch 4 changes as shown in parts B and C, and a flame is generated near the boundary between the rotor blade 1 and the flame shield plate 11. This is because it becomes difficult for 6 to rotate, and the hardened portion is reduced.
【０００８】また、動翼前縁の翼長手方向の形状変化が
大きい場合には、焼入れ部の温度がばらつくため、目標
とする硬度範囲に収まらないことがある。さらに、前縁
端厚みが極端に薄い場合、この部分が他の部分より加熱
され必要以上の硬度になったり焼き割れが発生する恐れ
もある。If the shape change of the leading edge of the moving blade in the blade longitudinal direction is large, the temperature of the quenching portion may fluctuate and the hardness may not fall within the target hardness range. Further, when the thickness of the leading edge is extremely thin, this portion may be heated more than other portions and may have an unnecessarily high hardness or may have a quench crack.
【０００９】本発明の目的は、焼入れ部分の硬さと寸法
のばらつきが少ない品質の安定した蒸気タービン動翼を
得ることができる蒸気タービン動翼のフレームハードニ
ング装置及びフレームハードニング方法を提供すること
である。An object of the present invention is to provide a flame hardening device and a flame hardening method for a steam turbine blade, which makes it possible to obtain a steam turbine blade of stable quality with less variation in hardness and size of a hardened portion. Is.
【００１０】[0010]
【課題を解決するための手段】請求項１の蒸気タービン
動翼のフレームハードニング装置は、蒸気タービン動翼
先端部入口端を焼入れするための火炎トーチと、この火
炎トーチからの火炎が水面上に位置する蒸気タービン動
翼先端部のうち焼き入れしない部分に当たらないように
するための火炎遮蔽板と、火炎トーチからの火炎が水面
を変動させることを防止するための水面安定板とを備え
ている。According to a first aspect of the present invention, there is provided a flame hardening device for a steam turbine rotor blade, wherein a flame torch for quenching the inlet end of the steam turbine rotor blade and a flame from the flame torch are on the water surface. Equipped with a flame shield plate to prevent hitting the non-quenched portion of the steam turbine blade tip located in the, and a water surface stabilizer to prevent the flame from the flame torch from changing the water surface. ing.
【００１１】請求項２の蒸気タービン動翼のフレームハ
ードニング装置は、水面安定板に代えて、火炎トーチか
らの火炎が水面に当たらないようにするための火炎整流
板を設けている。In the frame hardening device for a steam turbine rotor blade according to a second aspect of the present invention, instead of the water surface stabilizing plate, a flame rectifying plate is provided to prevent the flame from the flame torch from hitting the water surface.
【００１２】請求項３の蒸気タービン動翼のフレームハ
ードニング装置は、火炎トーチからの火炎が水面に当た
らないようにするための火炎整流板と、火炎トーチから
の火炎が水面を変動させることを防止するための水面安
定板との双方を備えている。According to a third aspect of the present invention, there is provided a flame hardening device for a steam turbine rotor blade, comprising: a flame straightening plate for preventing a flame from the flame torch from hitting the water surface; and a flame from the flame torch varying the water surface. It has both a water surface stabilizer to prevent it.
【００１３】請求項４の蒸気タービン動翼のフレームハ
ードニング装置は、水面安定板は水面位置に配置したこ
とを特徴とする。請求項５の蒸気タービン動翼のフレー
ムハードニング装置は、水面安定板は水中に配置したこ
とを特徴とする。A frame hardening device for a steam turbine blade according to a fourth aspect is characterized in that the water surface stabilizing plate is arranged at a water surface position. A frame hardening device for a steam turbine blade according to a fifth aspect of the present invention is characterized in that the water surface stabilizing plate is arranged in water.
【００１４】請求項６の蒸気タービン動翼のフレームハ
ードニング装置は、火炎遮蔽板の形状を、火炎トーチか
らの火炎が蒸気タービン動翼先端部入口端に導かれるよ
うに形成したことを特徴とする。According to a sixth aspect of the present invention, there is provided a frame hardening device for a steam turbine rotor blade, wherein a flame shielding plate is formed so that a flame from the flame torch is guided to the inlet end of the steam turbine rotor blade. To do.
【００１５】請求項７の蒸気タービン動翼のフレームハ
ードニング方法は、先端部に板状の削り代を設けた蒸気
タービン動翼の本体を水中に配置し、削り代を有する蒸
気タービン動翼の先端部を水面上に突出させ、削り代を
有する蒸気タービン動翼先端部のうち焼き入れしない部
分を火炎遮蔽板で遮蔽し、削り代を有する蒸気タービン
動翼先端部のうち焼き入れする部分及び削り代に火炎ト
ーチからの火炎を当て、削り代上に配置した温度センサ
からの検出温度に基づいて焼入れ温度を監視するように
したことを特徴とする。According to a seventh aspect of the present invention, there is provided a frame hardening method for a steam turbine moving blade, wherein a main body of the steam turbine moving blade having a plate-shaped cutting margin at its tip is arranged in water, and a steam turbine moving blade having a cutting margin is provided. The tip portion is projected above the water surface, and a portion of the steam turbine blade tip portion having a cutting allowance that is not quenched is shielded by a flame shield plate, and a portion of the steam turbine blade tip portion having a cutting allowance that is hardened and It is characterized in that a flame from a flame torch is applied to the cutting allowance, and the quenching temperature is monitored based on the temperature detected by a temperature sensor arranged above the cutting allowance.
【００１６】[0016]
【作用】本発明の蒸気タービン動翼のフレームハードニ
ング装置は、蒸気タービン動翼先端部入口端にフレーム
ハードニングを施す際に、冷却水水面の変動を抑えるた
めに水面安定板を使用する。また、水面安定板に代えて
火炎トーチの火炎が水面に変動を与えないように火炎の
方向を整流するための火炎整流板を使用する。また、水
面安定板及び火炎整流板の双方を使用する。また、火炎
の流れの乱れが生じにくい形状の火炎遮蔽板を用いる。
これにより、蒸気タービン動翼に安定した硬化域の幅が
得られ、蒸気タービン動翼の耐エロージョン対策が図れ
る。The steam turbine blade frame hardening device of the present invention uses the water surface stabilizing plate to suppress the fluctuation of the cooling water level when performing frame hardening on the inlet end of the steam turbine blade tip. Further, instead of the water surface stabilizing plate, a flame rectifying plate for rectifying the direction of the flame so that the flame of the flame torch does not change on the water surface is used. Also, both the water surface stabilizer and the flame straightening plate are used. In addition, a flame shielding plate having a shape that does not easily disturb the flow of flame is used.
As a result, a stable hardening zone width can be obtained in the steam turbine rotor blade, and measures against erosion resistance of the steam turbine rotor blade can be achieved.
【００１７】一方、本発明の蒸気タービン動翼のフレー
ムハードニングは、蒸気タービン動翼先端部に板状の削
り代を設け、フレームハードニング後の動翼本体に極端
に高硬度な部分の発生を防止すると共に、その削り代上
に温度センサを配置するので、温度計測精度の向上を図
ることができる。On the other hand, in the frame hardening of the steam turbine moving blade of the present invention, a plate-shaped cutting allowance is provided at the tip of the steam turbine moving blade, and an extremely high hardness portion is generated in the moving blade main body after frame hardening. In addition to preventing the above, the temperature sensor is arranged above the cutting allowance, so that the temperature measurement accuracy can be improved.
【００１８】[0018]
【実施例】以下、本発明の実施例を説明する。図１は、
本発明の蒸気タービン動翼のフレームハードニング装置
の構成図である。蒸気タービン動翼１の本体を水中に配
置し、その蒸気タービン動翼１の先端部を水面３上に突
出させて、蒸気タービン動翼先端部における蒸気の入口
端を火炎トーチ４で焼入れする。火炎トーチ４には酸素
供給装置１６及び燃焼ガス供給装置１７から酸素及び燃
焼ガスが供給される。この酸素及び燃焼ガスは流量計２
１で計測される。Embodiments of the present invention will be described below. Figure 1
It is a block diagram of the flame hardening apparatus of the steam turbine blade of this invention. The main body of the steam turbine rotor blade 1 is placed in water, the tip of the steam turbine rotor blade 1 is projected onto the water surface 3, and the steam inlet end of the steam turbine rotor blade tip is quenched by the flame torch 4. Oxygen and combustion gas are supplied to the flame torch 4 from the oxygen supply device 16 and the combustion gas supply device 17. This oxygen and combustion gas flow meter 2
Measured at 1.
【００１９】蒸気タービン動翼１の本体は動翼支持具７
で冷却水中で支持される。この冷却水の水面３には、火
炎トーチ４からの火炎が水面に当たることにより、水面
を変動させることを防止するための水面安定板５が設け
られている。この水面安定板５は水面安定板高さ調整装
置２２でその位置が調整される。また、この冷却水は冷
却水供給源２０から冷却水洗浄装置１９を介して供給さ
れる。The main body of the steam turbine rotor blade 1 is a rotor blade support 7
It is supported in cooling water. On the water surface 3 of this cooling water, a water surface stabilizing plate 5 is provided for preventing the water surface from fluctuating due to the flame from the flame torch 4 hitting the water surface. The position of the water surface stabilizer 5 is adjusted by the water surface stabilizer height adjusting device 22. The cooling water is supplied from the cooling water supply source 20 via the cooling water cleaning device 19.
【００２０】火炎トーチ４は、火炎トーチ移動ガイド１
４に沿って蒸気タービン動翼１の焼き入れを行う部分を
移動する。これはモーター１５によって行われる。ま
た、アクチュエータ１８により、火炎トーチ４は上下方
向にも移動可能となっている。これらの制御は制御装置
１３により行われる。また、温度センサ１２により焼入
れ温度を監視している。The flame torch 4 is a flame torch moving guide 1
The portion of the steam turbine blade 1 to be quenched is moved along the line 4. This is done by the motor 15. Further, the flame torch 4 can be moved in the vertical direction by the actuator 18. These controls are performed by the controller 13. Further, the temperature sensor 12 monitors the quenching temperature.
【００２１】図２は、本発明の蒸気タービン動翼のフレ
ームハードニング装置の一部切り欠き斜視図である。図
２から分かるように、蒸気タービン動翼１の焼き入れを
行う部分の水面に水面安定板５を設け、火炎トーチ４は
その焼き入れを行う部分を挟んで両側から火炎が発せら
れるようになっている。図３に示すように、蒸気タービ
ン動翼１の焼き入れを行う焼入れ部分２は、動翼１の先
端部入口端である。図３中の記号Ｌは焼入れ部２の長手
方向寸法、記号Ｗは焼入れ部２の幅方向寸法である。FIG. 2 is a partially cutaway perspective view of a frame hardening device for a steam turbine rotor blade according to the present invention. As can be seen from FIG. 2, a water surface stabilizer 5 is provided on the water surface of the portion of the steam turbine rotor blade 1 where quenching is performed, and the flame torch 4 is designed so that flames are emitted from both sides of the portion where quenching is performed. ing. As shown in FIG. 3, the quenching portion 2 for quenching the steam turbine rotor blade 1 is the inlet end of the tip of the rotor blade 1. The symbol L in FIG. 3 is the longitudinal dimension of the quenched portion 2, and the symbol W is the widthwise dimension of the quenched portion 2.
【００２２】次に、図４は本発明の第１の実施例の説明
図である。この第１の実施例は、火炎トーチ４からの火
炎６が水面３を変動させることを防止するための水面安
定板５を、水面位置に配置したものである。動翼１は動
翼支持具７により支持され、その先端部が水面３の上方
に突出している。すなわち、フレームハードニングを行
う動翼１を冷却水中に設置し、焼入れ部２が水面３上に
出るように保持する。この状態で火炎トーチ４と水面３
との間に水面安定板５を浮かべるか水面上に保持する。
フレームハードニングを行うと、通常の焼き入れ時に
は、燃焼ガスと火炎６の勢いで変動する水面３が水面安
定板５により、ほとんど変動しない。したがって、焼入
れ部２、特に入口端の幅方向寸法のばらつきを防止でき
る。この際の水面安定板５は、燃焼ガスと火炎６による
水面３の変動を抑え火炎６を遮断するためのもので、金
属製のものが望ましい。また、動翼１と水面と水面安定
板５は、動翼１の冷却を安定させるようにするために接
触させず、両者間にわずかの間隙が必要である。Next, FIG. 4 is an explanatory view of the first embodiment of the present invention. In this first embodiment, a water surface stabilizer 5 for preventing the flame 6 from the flame torch 4 from changing the water surface 3 is arranged at the water surface position. The moving blade 1 is supported by a moving blade support 7, and its tip portion projects above the water surface 3. That is, the moving blade 1 for frame hardening is installed in cooling water, and the quenching portion 2 is held so as to come out above the water surface 3. In this state, flame torch 4 and water surface 3
The water surface stabilizing plate 5 is floated between or and held on the water surface.
When frame hardening is performed, during normal quenching, the water surface 3 that fluctuates due to the momentum of the combustion gas and the flame 6 hardly changes due to the water surface stabilizing plate 5. Therefore, it is possible to prevent variations in the widthwise dimension of the quenching portion 2, particularly the inlet end. At this time, the water surface stabilizing plate 5 is for suppressing the fluctuation of the water surface 3 due to the combustion gas and the flame 6 and for blocking the flame 6, and is preferably made of metal. Further, the moving blade 1, the water surface, and the water surface stabilizing plate 5 are not in contact with each other in order to stabilize the cooling of the moving blade 1, and a slight gap is required between them.
【００２３】この第１の実施例によれば、冷却水表面に
水面の変動を抑制するための水面板５を配置しフレーム
ハードニングを行うので、フレームハードニング中に水
面が変動することがなく、焼入れ部寸法のばらつきを防
止することができる。According to the first embodiment, the water surface plate 5 for suppressing the fluctuation of the water surface is arranged on the surface of the cooling water to carry out the frame hardening, so that the water surface does not change during the frame hardening. It is possible to prevent variations in the size of the quenched portion.
【００２４】図５は、本発明の第２の実施例を示す説明
図である。図４に示した第１の実施例では、水面安定板
５を浮かべるか水面上に保持し、水面安定板５を水面位
置に配置したものであるが、この第２の実施例では水面
安定板５ａを水中に配置する。この様にしても、第１の
実施例の場合と同様な効果が得られる。FIG. 5 is an explanatory view showing the second embodiment of the present invention. In the first embodiment shown in FIG. 4, the water surface stabilizing plate 5 is floated or held on the water surface, and the water surface stabilizing plate 5 is arranged at the water surface position, but in the second embodiment, the water surface stabilizing plate is arranged. Place 5a in water. Even in this way, the same effect as in the case of the first embodiment can be obtained.
【００２５】図６は、本発明の第３の実施例の説明図で
ある。この第３の実施例は、火炎トーチ４からの火炎６
が水面３に当たらないようにするための火炎整流板８を
火炎トーチ４の下部に設けたものである。図７は、この
場合の火炎整流板８付の火炎トーチ４の説明図である。
図７（ａ），（ｂ）は火炎トーチの下部に先端部下部が
切り欠かれた板状の火炎整流板８ａを設けたものであ
り、図７（ｃ），（ｄ）は火炎トーチの下部に断面が底
部円弧状の火炎整流板８ｂを設けたものであり、図７
（ｅ），（ｆ）は火炎トーチの下部から曲率Ｒで火炎整
流板８ｃを突出させて形成したものである。また、火炎
トーチ４の火炎噴射口９は複数個のものを設けている。
したがって、この火炎整流板８ａ〜ｃにより燃焼ガスと
火炎６が水面を押し下げようと作用する力を軽減でき
る。また、火炎噴射口９が複数個形成したものを配置し
ているので、焼入れ効果を軽減させずに水面３への火炎
６及び燃焼ガスの影響を減少させることができる。これ
により、水面３の変動を防止でき、動翼１の焼き入れ部
２、特に動翼先端部入口端の幅方向寸法のばらつきを防
止できる。FIG. 6 is an explanatory diagram of the third embodiment of the present invention. In the third embodiment, the flame 6 from the flame torch 4 is used.
A flame straightening plate 8 is provided below the flame torch 4 to prevent the water from hitting the water surface 3. FIG. 7 is an explanatory diagram of the flame torch 4 with the flame rectifying plate 8 in this case.
7 (a) and 7 (b) are provided with a plate-shaped flame rectifying plate 8a having a notched lower end in the lower portion of the flame torch, and FIGS. 7 (c) and 7 (d) show the flame torch. The bottom part is provided with a flame straightening plate 8b having a circular arc-shaped cross section.
(E) and (f) are formed by projecting the flame straightening plate 8c with a curvature R from the lower portion of the flame torch. The flame torch 4 has a plurality of flame injection ports 9.
Therefore, the force exerted by the combustion gas and the flame 6 to push down the water surface can be reduced by the flame rectifying plates 8a to 8c. In addition, since a plurality of flame injection ports 9 are arranged, it is possible to reduce the influence of the flame 6 and the combustion gas on the water surface 3 without reducing the quenching effect. As a result, fluctuations in the water surface 3 can be prevented, and variations in the widthwise dimension of the quenching portion 2 of the moving blade 1, particularly, the moving blade tip inlet end can be prevented.
【００２６】次に、本発明の第４の実施例を説明する。
図８は本発明の動翼のフレームハードニング方法に適用
される動翼１の斜視図である。動翼１の前縁先端が極端
に薄い場合は、焼き入れ時において、前縁先端の温度が
他の部分と比較して早く上昇する。この様な場合、前縁
先端に当たる火炎６を調整することで焼き入れ温度、さ
らにはフレームハードニングによる硬度を調整すること
になるが、この方法では調整し切れないことがある。そ
こで、本発明の第４の実施例では、フレームハードニン
グ後、特別に硬度が高い部分が生じるのを防止するため
に、動翼１の加工時に動翼１の前縁端と一体に薄い削り
代１０を設ける。この削り代１０を付けたまま焼き入れ
を実施すると、前縁端より削り代１０が薄いので、その
削り代１０が選択的に加熱される。通常であるならば動
翼１の前縁端に加わる入熱が削り代１０に回り分散され
ることから動翼前縁端の加熱が防止できる。Next, a fourth embodiment of the present invention will be described.
FIG. 8 is a perspective view of the moving blade 1 applied to the moving blade frame hardening method of the present invention. When the tip of the leading edge of the moving blade 1 is extremely thin, the temperature of the tip of the leading edge during quenching rises faster than other parts. In such a case, the quenching temperature and further the hardness due to the frame hardening are adjusted by adjusting the flame 6 that hits the tip of the front edge, but this method may not be able to complete the adjustment. Therefore, in the fourth embodiment of the present invention, after the frame hardening, in order to prevent the occurrence of a particularly high hardness portion, when machining the moving blade 1, thin cutting is performed integrally with the leading edge of the moving blade 1. Providing a teenager 10. If quenching is performed with the cutting allowance 10 still attached, the cutting allowance 10 is thinner than the front edge, so that the cutting allowance 10 is selectively heated. Normally, the heat input applied to the leading edge of the moving blade 1 is distributed to the cutting margin 10 and dispersed, so that the heating of the leading edge of the moving blade can be prevented.
【００２７】図９は、第４の実施例の適用時の動翼１の
表面及び削り代１０の表面硬度を示した特性図である。
横軸は表面硬度計測位置であり、縦軸は表面部相対高度
である。加熱された削り代１０は許容硬度範囲Ａを越え
るが、動翼１本体は許容硬度範囲Ａ内にあり、焼入れ終
了後に削り代１０を削り落とせば、極端に高硬度な部分
は動翼１には存在しなくなる。FIG. 9 is a characteristic diagram showing the surface hardness of the rotor blade 1 and the surface hardness of the cutting allowance 10 when the fourth embodiment is applied.
The horizontal axis is the surface hardness measurement position, and the vertical axis is the surface relative height. The heated cutting allowance 10 exceeds the allowable hardness range A, but the moving blade 1 main body is within the allowable hardness range A, and if the cutting allowance 10 is scraped off after the quenching is completed, the extremely hard portion becomes the moving blade 1. Will not exist.
【００２８】また、通常、図１に示す焼入れ部の温度セ
ンサ１２は光学式温度計で、温度の監視は動翼１の前縁
端にて行っているが、前縁端は曲率Ｒがついているの
で、形状的に温度計測誤差が出やすい。このため、削り
代１０の平面部を設け、この削り代１０の平面部分の情
報に温度センサを配置して温度の監視を行うことで、通
常の温度計測より計測制度を向上させることができる。Further, normally, the temperature sensor 12 in the quenching portion shown in FIG. 1 is an optical thermometer, and the temperature is monitored at the front edge of the moving blade 1, but the front edge has a curvature R. Therefore, temperature measurement error is likely to occur due to the shape. Therefore, by providing a flat portion of the cutting allowance 10 and arranging a temperature sensor in the information of the flat portion of the cutting allowance 10 to monitor the temperature, the measurement accuracy can be improved as compared with the normal temperature measurement.
【００２９】図１０は、本発明の第５の実施例の説明図
である。図１１は図１０の水面３での断面図である。水
面３上で火炎焼き入れを行わない部分は、動翼１の表面
に直接火炎６が当たらぬように銅等の金属性火炎遮蔽板
１１にて養生を行うが、火炎遮蔽板１１の形状によって
は火炎の流れが乱れるため、火炎遮蔽板１１の縁に近い
動翼表面に火炎が当たりずらくなり、焼入れ部２の寸法
にばらつきが発生する。そこで、本発明の第５の実施例
では、図１１に示すように、火炎の流れが乱れずに火炎
遮蔽板１１の縁を流れる形状とするので、火炎遮蔽板１
１の縁に近い動翼表面に火炎６が当たる。したがって、
焼入れ部２の寸法のばらつきを防止することができる。FIG. 10 is an explanatory view of the fifth embodiment of the present invention. FIG. 11 is a sectional view of the water surface 3 in FIG. The portion of the water surface 3 on which flame quenching is not performed is cured by a metal flame shield plate 11 such as copper so that the flame 6 does not directly hit the surface of the rotor blade 1. However, depending on the shape of the flame shield plate 11, Since the flow of the flame is disturbed, the flame is hard to hit the surface of the moving blade near the edge of the flame shield plate 11, and the size of the quenching portion 2 varies. Therefore, in the fifth embodiment of the present invention, as shown in FIG. 11, the flame shield plate 1 has a shape in which the flame flow is not disturbed and flows through the edge of the flame shield plate 11.
The flame 6 hits the surface of the rotor blade near the edge of 1. Therefore,
It is possible to prevent variations in the dimensions of the quenched portion 2.
【００３０】以上の説明においては、水面安定板５、火
炎整流板８、火炎遮蔽板１１をそれぞれ別々に設けたも
のを示したが、これらを組み合わせて使用しても良い。
その場合は、それぞれが相乗してより一層良い効果が得
られる。すなわち、より確実に焼入れ部の寸法のばらつ
きが防止できると共に、焼入れ時の動翼本体の加熱防止
が可能となる。In the above description, the water surface stabilizing plate 5, the flame rectifying plate 8 and the flame shielding plate 11 are provided separately, but they may be used in combination.
In that case, each of them synergizes to obtain a better effect. That is, it is possible to more reliably prevent the dimensional variation of the hardened portion, and it is possible to prevent the heating of the moving blade main body during quenching.
【００３１】[0031]
【発明の効果】以上述べたように、本発明によれば、蒸
気タービン動翼のフレームハードニングに際し、火炎の
影響による水面の変動を抑制するので、焼入れ部の寸法
のばらつきを防止することができる。また、動翼の前縁
先端部に削り代を設けるので、動翼本体の過熱防止が可
能となる。これによって、品質の安定した蒸気タービン
動翼を得ることができる。As described above, according to the present invention, the fluctuation of the water surface due to the influence of the flame is suppressed during the frame hardening of the steam turbine rotor blade, so that the variation of the dimension of the quenching portion can be prevented. it can. Further, since the cutting margin is provided at the leading edge of the moving blade, it is possible to prevent the moving blade body from overheating. As a result, a steam turbine blade with stable quality can be obtained.
【図１】本発明の蒸気タービン動翼のフレームハードニ
ング装置の構成図FIG. 1 is a configuration diagram of a frame hardening device for a steam turbine blade of the present invention.
【図２】本発明の蒸気タービン動翼のフレームハードニ
ング装置の一部切り欠き斜視図FIG. 2 is a partially cutaway perspective view of a frame hardening device for a steam turbine blade of the present invention.
【図３】蒸気タービン動翼の斜視図FIG. 3 is a perspective view of a steam turbine blade.
【図４】本発明の第１の実施例の説明図FIG. 4 is an explanatory diagram of the first embodiment of the present invention.
【図５】本発明の第２の実施例の説明図FIG. 5 is an explanatory diagram of a second embodiment of the present invention.
【図６】本発明の第３の実施例の説明図FIG. 6 is an explanatory diagram of a third embodiment of the present invention.
【図７】図６に示した火炎整流板付の火炎トーチの変形
例を示し、（ａ）及び（ｂ）は第１変形例の側面図及び
正面図、（ｃ）及び（ｄ）は第２変形例の側面図及び正
面図、（ｅ）及び（ｆ）は第３変形例の側面図及び正面
図7 shows a modified example of the flame torch with the flame rectifying plate shown in FIG. 6, (a) and (b) showing a side view and a front view of the first modified example, and (c) and (d) showing a second example. The side view and front view of a modification, (e) and (f) are the side view and front view of a 3rd modification.
【図８】本発明の動翼のフレームハードニング方法に適
用される動翼の斜視図FIG. 8 is a perspective view of a moving blade applied to a method for frame hardening of a moving blade of the present invention.
【図９】本発明の第４の実施例の適用時の動翼の表面及
び削り代の表面硬度を示した特性図FIG. 9 is a characteristic diagram showing the surface hardness of the rotor blade and the surface allowance when the fourth embodiment of the present invention is applied.
【図１０】本発明の第５の実施例の説明図FIG. 10 is an explanatory diagram of a fifth embodiment of the present invention.
【図１１】図１０における水面位置での平断面図11 is a plan cross-sectional view at the water surface position in FIG.
【図１２】従来例におけるフレームハードニングの説明
図FIG. 12 is an explanatory diagram of frame hardening in a conventional example.
【図１３】従来例における火炎遮断板を取り付けた状態
を示す斜視図FIG. 13 is a perspective view showing a state in which a flame blocking plate is attached in a conventional example.
【図１４】従来例における火炎遮断板の近傍における火
炎の流れの説明図FIG. 14 is an explanatory diagram of a flame flow in the vicinity of the flame blocking plate in the conventional example.
１ 蒸気タービン動翼 ２ 焼入れ部 ３ 水面 ４ 火炎トーチ ５ 水面安定板 ６ 火炎 ７ 動翼支持具 ８ 火炎整流板 ９ 火炎噴射口 １０ 削り代 １１ 火炎遮蔽板 １２ 温度センサ １３ 制御装置 １４ 火炎トーチ移動ガイド １５ モータ １６ 酸素供給装置 １７ 燃焼ガス供給装置 １８ アクチュエータ １９ 冷却水洗浄装置 ２０ 冷却水供給源 ２１ 流量計 ２２ 水面安定板高さ調整装置 1 Steam Turbine Blade 2 Quenching Part 3 Water Surface 4 Flame Torch 5 Water Surface Stabilizer 6 Flame 7 Moving Blade Support 8 Flame Rectifier 9 Flame Injector 10 Shaving Allowance 11 Flame Shield 12 Temperature Sensor 13 Controller 14 Flame Torch Movement Guide 15 Motor 16 Oxygen Supply Device 17 Combustion Gas Supply Device 18 Actuator 19 Cooling Water Washing Device 20 Cooling Water Supply Source 21 Flow Meter 22 Water Level Stabilizer Height Adjusting Device
Claims (7)
し、前記蒸気タービン動翼の先端部を水面上に突出させ
て、前記蒸気タービン動翼先端部における蒸気の入口端
を焼入れするようにした蒸気タービン動翼のフレームハ
ードニング装置において、前記蒸気タービン動翼先端部
入口端を焼入れするための火炎トーチと、前記火炎トー
チからの火炎が前記水面上に位置する前記蒸気タービン
動翼先端部のうち焼き入れしない部分に当たらないよう
にするための火炎遮蔽板と、前記火炎トーチからの火炎
が前記水面を変動させることを防止するための水面安定
板とを備えたことを特徴とする蒸気タービン動翼のフレ
ームハードニング装置。1. A steam turbine blade main body is placed in water, a tip of the steam turbine blade is projected above a water surface, and an inlet end of steam at the tip of the steam turbine blade is quenched. In a frame hardening device for a steam turbine moving blade, a flame torch for quenching the inlet end of the steam turbine moving blade tip, and a flame from the flame torch, the steam turbine moving blade tip portion located on the water surface. A steam comprising a flame shielding plate for preventing it from hitting a non-quenched portion, and a water surface stabilizing plate for preventing the flame from the flame torch from changing the water surface. Turbine blade frame hardening device.
し、前記蒸気タービン動翼の先端部を水面上に突出させ
て、記蒸気タービン動翼先端部における蒸気の入口端を
焼入れするようにした蒸気タービン動翼のフレームハー
ドニング装置において、前記蒸気タービン動翼先端部入
口端を焼入れするための火炎トーチと、前記火炎トーチ
からの火炎が前記水面上に位置する前記蒸気タービン動
翼先端部のうち焼き入れしない部分に当たらないように
するための火炎遮蔽板と、前記火炎トーチからの火炎が
前記水面に当たらないようにするための火炎整流板とを
備えたことを特徴とする蒸気タービン動翼のフレームハ
ードニング装置。2. A steam turbine blade main body is placed in water, the tip of the steam turbine blade is projected above the water surface, and the steam inlet end at the steam turbine blade tip is quenched. In a frame hardening device for a steam turbine moving blade, a flame torch for quenching the inlet end of the steam turbine moving blade tip, and a flame from the flame torch, the steam turbine moving blade tip portion located on the water surface. A steam turbine, comprising: a flame shielding plate for preventing a portion that is not quenched from hitting, and a flame rectifying plate for preventing a flame from the flame torch from hitting the water surface. Frame hardening device for moving blades.
し、前記蒸気タービン動翼の先端部を水面上に突出させ
て、前記蒸気タービン動翼先端部における蒸気の入口端
を焼入れするようにした蒸気タービン動翼のフレームハ
ードニング装置において、前記蒸気タービン動翼先端部
入口端を焼入れするための火炎トーチと、前記火炎トー
チからの火炎が前記水面上に位置する前記蒸気タービン
動翼先端部のうち焼き入れしない部分に当たらないよう
にするための火炎遮蔽板と、前記火炎トーチからの火炎
が前記水面に当たらないようにするための火炎整流板
と、前記火炎トーチからの火炎が前記水面を変動させる
ことを防止するための水面安定板とを備えたことを特徴
とする蒸気タービン動翼のフレームハードニング装置。3. A steam turbine blade main body is placed in water, the tip of the steam turbine blade is projected above the water surface, and the steam inlet end of the steam turbine blade tip is quenched. In a frame hardening device for a steam turbine moving blade, a flame torch for quenching the inlet end of the steam turbine moving blade tip, and a flame from the flame torch, the steam turbine moving blade tip portion located on the water surface. Of the flame shield plate to prevent hitting the non-quenched portion, a flame straightening plate to prevent the flame from the flame torch from hitting the water surface, the flame from the flame torch is the water surface A frame hardening device for a steam turbine rotor blade, comprising:
とを特徴とする請求項１又は請求項３に記載の蒸気ター
ビン動翼のフレームハードニング装置。4. The frame hardening device for a steam turbine rotor blade according to claim 1, wherein the water surface stabilizer is arranged at a water surface position.
特徴とする請求項１又は請求項３に記載の蒸気タービン
動翼のフレームハードニング装置。5. The frame hardening device for a steam turbine rotor blade according to claim 1, wherein the water surface stabilizer is arranged in water.
チからの火炎が前記蒸気タービン動翼先端部入口端に導
かれるように形成したことを特徴とする請求項１乃至請
求項３に記載の蒸気タービン動翼のフレームハードニン
グ装置。6. The flame shield plate is shaped so that a flame from the flame torch is guided to an inlet end of the steam turbine rotor blade tip portion. Frame hardening device for steam turbine rotor blades.
し、前記蒸気タービン動翼の先端部を水面上に突出さ
せ、前記蒸気タービン動翼先端部における蒸気の入口端
を焼入れするようにした蒸気タービン動翼のフレームハ
ードニング方法において、先端部に板状の削り代を設け
た蒸気タービン動翼の本体を水中に配置し、前記削り代
を有する蒸気タービン動翼の先端部を水面上に出し、前
記削り代を有する蒸気タービン動翼先端部のうち焼き入
れしない部分を火炎遮蔽板で遮蔽し、前記削り代を有す
る蒸気タービン動翼先端部のうち焼き入れする部分及び
前記削り代に火炎トーチからの火炎を当て、前記削り代
上に配置した温度センサからの検出温度に基づいて前記
焼入れ温度を監視するようにしたことを特徴とする蒸気
タービン動翼のフレームハードニング方法。7. The main body of the steam turbine rotor blade is arranged in water, the tip of the steam turbine rotor blade is projected above the water surface, and the inlet end of steam at the tip end of the steam turbine rotor blade is quenched. In a frame hardening method for a steam turbine blade, a main body of a steam turbine blade having a plate-shaped cutting margin at the tip is placed in water, and the tip of the steam turbine blade having the cutting margin is placed on the water surface. A portion of the steam turbine blade tip having the cutting allowance that is not quenched is shielded by a flame shield plate, and a portion of the steam turbine blade tip having the cutting allowance that is to be quenched and the cutting allowance is a flame. A frame of a steam turbine rotor blade, characterized in that a flame from a torch is applied and the quenching temperature is monitored based on a temperature detected by a temperature sensor arranged above the cutting allowance. Hardening method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2647495A JPH08225828A (en) | 1995-02-15 | 1995-02-15 | Flame hardening device for steam turbine moving blade and flame hardening |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2647495A JPH08225828A (en) | 1995-02-15 | 1995-02-15 | Flame hardening device for steam turbine moving blade and flame hardening |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08225828A true JPH08225828A (en) | 1996-09-03 |
Family
ID=12194516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2647495A Pending JPH08225828A (en) | 1995-02-15 | 1995-02-15 | Flame hardening device for steam turbine moving blade and flame hardening |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08225828A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000032827A1 (en) * | 1998-12-02 | 2000-06-08 | Sanyo Machine Works, Ltd. | Method and apparatus for monitoring workpiece heating temperature in flame hardening |
| KR20030048853A (en) * | 2001-12-13 | 2003-06-25 | 현대자동차주식회사 | Coolant suppling apparatus for flame hardening |
| JP2007308798A (en) * | 2006-05-17 | 2007-11-29 | General Electric Co <Ge> | Device for repairing high-pressure turbine blade |
| KR100800558B1 (en) * | 2007-07-20 | 2008-02-04 | 공경열 | Apparatus for forming thick plate |
| JP2011007093A (en) * | 2009-06-25 | 2011-01-13 | Hitachi Ltd | Turbine rotor blade |
| JP2011106449A (en) * | 2009-11-12 | 2011-06-02 | General Electric Co <Ge> | Turbine rotating blade and rotor |
| JP2013209912A (en) * | 2012-03-30 | 2013-10-10 | Fuji Electric Co Ltd | Steam turbine blade and hardening treatment method for steam turbine blade |
-
1995
- 1995-02-15 JP JP2647495A patent/JPH08225828A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000032827A1 (en) * | 1998-12-02 | 2000-06-08 | Sanyo Machine Works, Ltd. | Method and apparatus for monitoring workpiece heating temperature in flame hardening |
| KR20030048853A (en) * | 2001-12-13 | 2003-06-25 | 현대자동차주식회사 | Coolant suppling apparatus for flame hardening |
| JP2007308798A (en) * | 2006-05-17 | 2007-11-29 | General Electric Co <Ge> | Device for repairing high-pressure turbine blade |
| KR100800558B1 (en) * | 2007-07-20 | 2008-02-04 | 공경열 | Apparatus for forming thick plate |
| JP2011007093A (en) * | 2009-06-25 | 2011-01-13 | Hitachi Ltd | Turbine rotor blade |
| JP2011106449A (en) * | 2009-11-12 | 2011-06-02 | General Electric Co <Ge> | Turbine rotating blade and rotor |
| JP2013209912A (en) * | 2012-03-30 | 2013-10-10 | Fuji Electric Co Ltd | Steam turbine blade and hardening treatment method for steam turbine blade |
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