JPH0772483B2 - Root structure of ceramic rotor blade and its processing method - Google Patents
Root structure of ceramic rotor blade and its processing methodInfo
- Publication number
- JPH0772483B2 JPH0772483B2 JP5594291A JP5594291A JPH0772483B2 JP H0772483 B2 JPH0772483 B2 JP H0772483B2 JP 5594291 A JP5594291 A JP 5594291A JP 5594291 A JP5594291 A JP 5594291A JP H0772483 B2 JPH0772483 B2 JP H0772483B2
- Authority
- JP
- Japan
- Prior art keywords
- blade
- blade root
- root
- rotor blade
- tapered
- 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
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ガスタービンなど高速
回転機械の軸流式羽根車において用いられるセラミック
ス製回転翼翼根部とその加工方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ceramic rotor blade root portion used in an axial flow impeller of a high-speed rotating machine such as a gas turbine and a method of processing the same.
【０００２】[0002]
【従来の技術】ガスタービン等の軸流式羽根車は、主に
製造上の理由から、流体力を受ける回転翼とディスク部
とを別個に製造し、ディスク部の外周に回転翼を多数枚
植込む構造が採用されており、セラミックス製羽根車に
おいても、図６に示すように、金属製のディスク８にセ
ラミックス製回転翼３を植込むことが行なわれている。2. Description of the Related Art For an axial flow impeller such as a gas turbine, mainly for manufacturing reasons, a rotor blade that receives a fluid force and a disk portion are manufactured separately, and a large number of rotor blades are provided on the outer periphery of the disk portion. A structure for implanting is adopted, and even in a ceramic impeller, as shown in FIG. 6, the ceramic rotor blades 3 are implanted in a metal disk 8.
【０００３】このように金属製ディスク８にセラミック
ス製回転翼３を植込んだ場合には、高速回転による遠心
力により回転翼の翼根部２には高遠心力が発生し、くび
れ部６で応力集中が起こる。これに対しては、くびれ部
６の形状を適切に設計することにより応力の低減を図る
ことが可能である。When the ceramic rotor blade 3 is implanted in the metal disk 8 as described above, a high centrifugal force is generated at the blade root portion 2 of the rotor blade due to the centrifugal force due to the high speed rotation, and stress is concentrated at the necked portion 6. Happens. On the other hand, it is possible to reduce the stress by appropriately designing the shape of the constricted portion 6.
【０００４】一方、テーパ部７でも高い接触応力が発生
しており、このテーパ部７での形状不良に起因した異常
な接触応力による破損が、従来、セラミックス製回転翼
破損の主原因となっていた。ここで、テーパ部７の形状
不良の原因は、テーパ角度の不良とテーパ面の凹凸、即
ち、テーパ面の平滑度不良の二つに大別される。On the other hand, a high contact stress is also generated in the taper portion 7, and the damage due to the abnormal contact stress due to the defective shape in the taper portion 7 has conventionally been the main cause of the damage of the ceramic rotor blade. It was Here, the cause of the defective shape of the tapered portion 7 is roughly classified into a defective taper angle and unevenness of the tapered surface, that is, poor smoothness of the tapered surface.
【０００５】テーパ角度が不良の場合には、テーパ面が
如何に平滑であっても、図８に示すように、金属ディス
ク８と翼根部２とは線接触または点接触を起こす。ま
た、テーパ面の平滑度不良の場合には、テーパ面の凸部
で金属ディスク８と線接触または点接触を起こすことに
なり、上記いずれの場合にも予期しない高接触応力、い
わゆるヘルツストレスが発生する。If the taper angle is poor, no matter how smooth the taper surface is, the metal disk 8 and the blade root portion 2 make line contact or point contact, as shown in FIG. Further, when the smoothness of the tapered surface is poor, the convex portion of the tapered surface causes a line contact or a point contact with the metal disk 8, and in any of the above cases, unexpectedly high contact stress, so-called Hertz stress occurs. Occur.
【０００６】セラミックスは金属に比べて高ヤング率の
物質であるため、高いヘルツストレスが発生する。この
ヘルツストレスはごく表面近傍に発生するため、セラミ
ックス表面のわずかな加工傷等の損傷もその影響は極め
て大きく、主な破壊発生源となるので、有害な表面損傷
を除去するとともに高ヘルツストレスの発生を抑制する
ことが必要不可欠である。Since ceramics have a higher Young's modulus than metals, high Hertzian stress occurs. Since this Hertz stress is generated in the vicinity of the surface, even the slight damage such as processing scratches on the ceramic surface has a great effect and is a major source of destruction, so it removes harmful surface damage as well as high Hertz stress. It is essential to suppress the occurrence.
【０００７】従って、翼根部２においては、くびれ部６
よりもテーパ部７の形状精度及び表面品質が重要とな
る。従来、セラミックス製回転翼翼根部の加工は、図７
に示すように、幅広の総型砥石５を用いて、くびれ部６
からテーパ部７にかけて同時に加工形成する方法により
行なわれている。Therefore, in the blade root portion 2, the constricted portion 6
The accuracy of the shape and the surface quality of the tapered portion 7 are more important than that. Conventionally, the processing of the blade part of the ceramic rotary blade is performed as shown in FIG.
As shown in FIG.
To the taper portion 7 are simultaneously processed and formed.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、この方
法では砥石幅が大きくなると共に砥石の形状が任意曲線
となるため、総型砥石５の製作精度を上げることは困難
であり、また加工中の総型砥石５の形状くずれ等のた
め、回転翼植込部の形状精度を悪くし、テーパ部７の形
状精度は約±５０μm 、テーパ角精度は約±１．４°が
限界であるという問題があった。さらに砥石が総型とな
るためプランジ研削となり、トラバース研削と比較して
加工面品質の低下を余儀なくされていた。However, in this method, since the width of the grindstone becomes large and the shape of the grindstone becomes an arbitrary curve, it is difficult to improve the manufacturing accuracy of the full-scale grindstone 5, and the total shape during the working is also small. The shape accuracy of the rotary blade impairs the shape accuracy of the grinding wheel 5, and the shape accuracy of the taper part 7 is about ± 50 μm, and the taper angle accuracy is about ± 1.4 °. there were. Furthermore, since the grindstone is a full-scale type, plunge grinding is performed, and the quality of the machined surface is inevitably reduced compared to traverse grinding.
【０００９】[0009]
【課題を解決するための手段】そこで本発明者は、テー
パ部の形状精度、角精度を向上させることができる回転
翼翼根部の構造と加工方法について鋭意検討を行なった
結果、本発明に到達したものである。Therefore, the present inventor has arrived at the present invention as a result of earnestly examining the structure and processing method of the root portion of a rotary blade capable of improving the shape accuracy and angular accuracy of the tapered portion. It is a thing.
【００１０】即ち、本発明によれば、セラミックス製回
転翼翼根部において、金属製ディスクと接触する平面処
理されたテーパ部と曲面処理されたくびれ部とを、凸状
境界部にて不連続に結合して形成したことを特徴とする
セラミックス製回転翼翼根部構造、が提供される。That is, according to the present invention, in the root portion of the rotor blade made of ceramics, the flattened tapered portion and the curved neck portion which come into contact with the metal disk are discontinuously joined at the convex boundary portion. A rotor blade blade root structure made of ceramics is provided.
【００１１】また、本発明によれば、セラミックス製回
転翼翼根部を加工する方法において、金属製ディスクと
接触するテーパ部とくびれ部とを別個の総型砥石により
加工することを特徴とするセラミックス製回転翼翼根部
の加工方法、および、セラミックス製回転翼翼根部を加
工する方法において、該翼根部のくびれ部は成形時に形
成し、テーパ部のみを総型砥石により加工することを特
徴とするセラミックス製回転翼翼根部の加工方法、が提
供される。Further, according to the present invention, in the method for processing the root portion of the rotor blade made of ceramics, the tapered portion and the constricted portion which come into contact with the metal disc are processed by separate forming wheels. A method for processing a rotor blade root portion, and a method for processing a ceramic rotor blade root portion, characterized in that the constricted portion of the blade root portion is formed at the time of molding, and only the taper portion is processed by a full-form grindstone. A method for processing a blade root portion is provided.
【００１２】本発明においては、翼根部のテーパ部を、
くびれ部側及び翼根部先端側でクラウニング処理するこ
とと、当該部における応力を緩和低減でき、好ましい。In the present invention, the taper portion of the blade root is
It is preferable to perform the crowning treatment on the constricted portion side and the blade root tip side, since the stress in the portion can be relaxed and reduced.
【００１３】[0013]
【作用】本発明は、セラミックス製回転翼翼根部におい
て、図１〜図４に示すように回転翼翼根部のテーパ部７
とくびれ部６とを別々の総型砥石５ａ、５ｂにより加工
し、テーパ部７とくびれ部６とを凸状境界部１０にて不
連続に結合して形成したことすることを特徴とする。According to the present invention, in the ceramic rotor blade root portion, as shown in FIGS.
It is characterized in that the constricted portion 6 and the constricted portion 6 are processed by separate shaping wheels 5a and 5b, and the tapered portion 7 and the constricted portion 6 are discontinuously joined at the convex boundary portion 10.
【００１４】このように、テーパ部７とくびれ部６とを
別々の総型砥石５ａ、５ｂで加工するので、従来の加工
方法に比べて砥石の幅を小さくでき、しかも、砥石形状
がストレートな平型砥石５ｃでもよいため、高い加工精
度を達成することができる。例えば、テーパ部７の形状
精度は、従来は約±５０μm 程度であったが、本発明に
よれば約±１０μm という高精度を得ることができる。As described above, since the taper portion 7 and the constricted portion 6 are machined by the separate forming wheels 5a and 5b, the width of the wheel can be reduced as compared with the conventional processing method, and the shape of the wheel is straight. Since the flat grindstone 5c may be used, high processing accuracy can be achieved. For example, the shape accuracy of the tapered portion 7 has been about ± 50 μm in the past, but according to the present invention, a high accuracy of about ± 10 μm can be obtained.
【００１５】回転翼が破損する原因はテーパ部７におけ
る片当りが主であり、本発明によりこれが解消されるこ
とにより、セラミックス製回転翼の性能を向上させるこ
とができる。また、本発明においては、セラミックス製
回転翼翼根部の加工に際して、くびれ部６は成形時に形
成し、テーパ部７のみを総型砥石５ｂにより加工するこ
とも可能である。さらに、テーパ部加工時にはトラバー
ス研削を行なうことも可能となり、加工面品質の向上に
も寄与する。The main cause of breakage of the rotary blade is the one-sided contact at the taper portion 7. By eliminating this by the present invention, the performance of the ceramic rotary blade can be improved. Further, in the present invention, it is also possible to form the constricted portion 6 at the time of forming the root portion of the ceramic rotary blade and form only the taper portion 7 with the full-form grindstone 5b. Further, it becomes possible to perform traverse grinding when processing the tapered portion, which contributes to improvement of the quality of the machined surface.
【００１６】このように、テーパ部７のみを加工する場
合には、くびれ部６の加工工程が必要無く、その結果加
工コストが低減でき、量産に適する。また、テーパ部７
の加工は、図４に示すように、通常の平型砥石５ｃを用
いても加工することができる。As described above, when only the tapered portion 7 is machined, the machining process of the constricted portion 6 is not necessary, and as a result, the machining cost can be reduced, which is suitable for mass production. Also, the taper portion 7
As shown in FIG. 4, the processing of can also be performed by using a normal flat grindstone 5c.
【００１７】さらに、本発明においては、セラミックス
製回転翼翼根部の加工に際して、翼根部のテーパ部７
を、くびれ部側及び翼根部先端側でクラウニング処理す
ることにより、応力を緩和低減できる。ここで、クラウ
ニング加工とは、加工面の両端に行くに従って砥石とテ
ーパ部の切削面距離を次第に縮め、切削面にまるみをつ
ける加工方法であり、エッジストレスの低減に効果があ
る。Further, according to the present invention, when the ceramic rotor blade root portion is machined, the blade root taper portion 7 is formed.
The stress can be relaxed and reduced by performing crowning on the constricted portion side and the blade root tip side. Here, the crowning is a processing method in which the cutting surface distance between the grindstone and the taper portion is gradually reduced toward the both ends of the processing surface to round the cutting surface, and it is effective in reducing edge stress.
【００１８】[0018]
【実施例】以下、本発明を実施例に基き更に詳細に説明
するが、本発明はこれらの実施例に限定されるものでは
ない。The present invention will be described in more detail based on the following examples, but the invention is not intended to be limited to these examples.
【００１９】（実施例１）窒化珪素原料にＹ2 Ｏ3 、Ｍ
ｇＯ、ＺｒＯ2 を焼結助剤として添加し、混合した後、
さらにバインダーを添加し混練して得られた成形原料を
金型内に射出して、図５に示すような羽根部１と翼根部
２を有する回転翼３を成形し、次いでこの成形体を脱脂
した後、焼結した。上記の場合、羽根部１は最終形状で
得られるが、翼根部２は焼結後に加工するため加工代４
を設けた。(Example 1) Y 2 O 3 and M were used as raw materials for silicon nitride.
After adding gO and ZrO 2 as sintering aids and mixing,
Furthermore, a molding raw material obtained by adding a binder and kneading is injected into a mold to mold a rotary blade 3 having a blade portion 1 and a blade root portion 2 as shown in FIG. 5, and then degreasing this molded body. And then sintered. In the above case, the blade portion 1 is obtained in the final shape, but the blade root portion 2 is processed after sintering, so that the machining allowance 4
Was set up.
【００２０】次に、前記回転翼３の窒化珪素焼結体を加
工用治具により把持して下記のように翼根部２の仕上げ
加工を行なった。まず、ダイヤモンド総型砥石５ａを用
いて、図１〜図２に示すように、翼根部２のくびれ部６
をプランジ研削加工した。次に、図３に示すように、翼
根部２のテーパ部７を、くびれ部６に使用したものとは
別の総型砥石５ｂを使用してプランジ研削加工を行なっ
た。Next, the silicon nitride sintered body of the rotary blade 3 was gripped by a processing jig, and the blade root portion 2 was finished as follows. First, as shown in FIGS. 1 and 2, the constricted portion 6 of the blade root portion 2 is formed by using the diamond pattern grinding stone 5a.
Was plunge ground. Next, as shown in FIG. 3, the taper portion 7 of the blade root portion 2 was plunge-ground using another type of grindstone 5b different from that used for the constricted portion 6.
【００２１】このようにして形成された翼根部２のテー
パ部７の形状精度は±１０μm 、テーパ角度の精度は±
０．３°という高精度であった。The taper portion 7 of the blade root 2 thus formed has a shape accuracy of ± 10 μm and a taper angle accuracy of ± 10 μm.
The precision was as high as 0.3 °.
【００２２】（実施例２）くびれ部６の形状を図２の形
状となるような金型形状とした以外は全て実施例１と同
様の方法で成形、焼結して、図５に示すような形状の翼
根部２の焼結体を作製し、総型砥石５ｂでテーパ部を加
工した。このようにして得られたセラミックス製回転翼
翼根部２の形状精度は±１０μm 、テーパ角度は±０．
３°と良好であった。なお、テーパ部７の加工は、図４
に示すように、通常の平型砥石５ｃを使用して加工する
こともできた。(Embodiment 2) Molding and sintering are all carried out in the same manner as in Embodiment 1 except that the shape of the constricted portion 6 is changed to the shape of the mold shown in FIG. 2, and as shown in FIG. A sintered body of the blade root portion 2 having various shapes was produced, and the taper portion was processed by the full-form grindstone 5b. The ceramic rotor blade root portion 2 thus obtained had a shape accuracy of ± 10 μm and a taper angle of ± 0.
It was good at 3 °. The processing of the taper portion 7 is performed by
It was also possible to process using a normal flat grindstone 5c as shown in FIG.
【００２３】[0023]
【発明の効果】以上説明したように、本発明のセラミッ
クス製回転翼翼根部構造とその加工方法によれば、テー
パ部とくびれ部を別個の総型砥石により加工するので、
従来の加工方法に比べて砥石の幅が小さくなり、しかも
砥石の形状は平型砥石でもよいため、高い加工精度と高
品質な加工面を得ることができる。As described above, according to the ceramic rotor blade root structure and the method of processing the same of the present invention, since the tapered portion and the constricted portion are processed by the separate grindstones,
Since the width of the grindstone is smaller than that of the conventional machining method, and the shape of the grindstone may be a flat grindstone, it is possible to obtain a high machining accuracy and a high-quality machined surface.
【００２４】また、くびれ部は成形時に形成し、テーパ
部のみを加工するようにすれば、くびれ部の加工工程が
なく加工コストが低減でき、しかもテーパ部の加工は通
常の平型砥石を使用して加工することができるので量産
に適するという利点を有する。If the constricted portion is formed at the time of forming and only the tapered portion is processed, the constricted portion is not processed and the machining cost can be reduced. Moreover, the taper portion is processed by using a normal flat grindstone. Since it can be processed in this way, it has an advantage that it is suitable for mass production.
【図１】本発明の一実施例を示す翼根部のくびれ部の加
工説明図である。FIG. 1 is a working explanatory view of a constricted portion of a blade root portion showing an embodiment of the present invention.
【図２】本発明の一実施例を示す翼根部のくびれ部の加
工仕上図である。FIG. 2 is a finish drawing of the constricted portion of the blade root portion showing the embodiment of the present invention.
【図３】本発明の一実施例を示す翼根部のテーパ部の加
工説明図である。FIG. 3 is a working explanatory view of a tapered portion of a blade root portion showing an embodiment of the present invention.
【図４】図３におけるテーパ部の他の加工説明図であ
る。FIG. 4 is another working explanatory view of the tapered portion in FIG.
【図５】セラミックス製回転翼の断面概要図である。FIG. 5 is a schematic cross-sectional view of a ceramic rotary blade.
【図６】金属製ディスクにセラミックス製回転翼を植込
んだ状態を示す説明図である。FIG. 6 is an explanatory view showing a state in which a ceramic rotary blade is embedded in a metal disk.
【図７】従来の翼根部の加工方法を示す説明図である。FIG. 7 is an explanatory view showing a conventional blade root machining method.
【図８】従来の翼根部の加工方法を示す説明図である。FIG. 8 is an explanatory view showing a conventional blade root machining method.
１ 羽根部 ２ 翼根部 ３ 回転翼 ４ 加工代 ５ａ，５ｂ 総型砥石 ５ｃ 平型砥石 ６ くびれ部 ７ テーパ部 ８ 金属製ディスク １０ 凸状境界部 DESCRIPTION OF SYMBOLS 1 Blade part 2 Blade root part 3 Rotor blade 4 Machining allowances 5a, 5b General type grindstone 5c Flat grindstone 6 Constriction part 7 Tapered part 8 Metal disk 10 Convex boundary part
Claims (5)
金属製ディスクと接触する平面処理されたテーパ部と曲
面処理されたくびれ部とを、凸状境界部にて不連続に結
合して形成したことを特徴とするセラミックス製回転翼
翼根部構造。1. A ceramic rotor blade root portion, comprising:
A rotary blade root structure made of ceramics, characterized in that a flattened tapered portion that comes into contact with a metal disk and a curved surface-shaped constricted portion are discontinuously connected at a convex boundary portion.
側でクラウニング処理した請求項１記載のセラミックス
製回転翼翼根部構造。2. A ceramic rotary blade blade root structure according to claim 1, wherein the tapered portion is crowned on the neck portion side and the blade root tip side.
方法において、金属製ディスクと接触するテーパ部とく
びれ部とを別個の総型砥石により加工することを特徴と
するセラミックス製回転翼翼根部の加工方法。3. A method for processing a root part of a ceramic rotor blade, characterized in that the tapered part and the constricted part that come into contact with the metal disk are processed by separate shaping wheels. .
方法において、該翼根部のくびれ部は成形時に形成し、
テーパ部のみを総型砥石により加工することを特徴とす
るセラミックス製回転翼翼根部の加工方法。4. A method for processing a root portion of a rotary blade made of ceramics, wherein the narrowed portion of the blade root is formed at the time of molding.
A method for processing a root portion of a rotor blade made of ceramics, characterized in that only a tapered portion is processed by a full-scale grindstone.
側でクラウニング処理する請求項３または４記載のセラ
ミックス製回転翼翼根部の加工方法。5. The method of working a root portion of a rotary blade made of ceramics according to claim 3, wherein the tapered portion is crowned at the neck portion side and the blade root tip side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5594291A JPH0772483B2 (en) | 1991-02-27 | 1991-02-27 | Root structure of ceramic rotor blade and its processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5594291A JPH0772483B2 (en) | 1991-02-27 | 1991-02-27 | Root structure of ceramic rotor blade and its processing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04272404A JPH04272404A (en) | 1992-09-29 |
| JPH0772483B2 true JPH0772483B2 (en) | 1995-08-02 |
Family
ID=13013132
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5594291A Expired - Lifetime JPH0772483B2 (en) | 1991-02-27 | 1991-02-27 | Root structure of ceramic rotor blade and its processing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0772483B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004183658A (en) * | 2002-12-03 | 2004-07-02 | General Electric Co <Ge> | Method and device for removing predetermined amount of material from bottom of dovetail slot in gas turbine engine disk |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5435694A (en) * | 1993-11-19 | 1995-07-25 | General Electric Company | Stress relieving mount for an axial blade |
| FR2964585B1 (en) * | 2010-09-15 | 2012-10-05 | Snecma | METHOD AND MACHINE TOOL FOR ADJUSTING THE CONTOUR OF A WORKPIECE |
-
1991
- 1991-02-27 JP JP5594291A patent/JPH0772483B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004183658A (en) * | 2002-12-03 | 2004-07-02 | General Electric Co <Ge> | Method and device for removing predetermined amount of material from bottom of dovetail slot in gas turbine engine disk |
| JP4576113B2 (en) * | 2002-12-03 | 2010-11-04 | ゼネラル・エレクトリック・カンパニイ | Method and apparatus for removing a predetermined amount of material from the bottom of a dovetail slot in a gas turbine engine disk |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04272404A (en) | 1992-09-29 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 19960130 |