JPS61142024A - Shrink-fit of ceramic shaft - Google Patents
Shrink-fit of ceramic shaftInfo
- Publication number
- JPS61142024A JPS61142024A JP26019384A JP26019384A JPS61142024A JP S61142024 A JPS61142024 A JP S61142024A JP 26019384 A JP26019384 A JP 26019384A JP 26019384 A JP26019384 A JP 26019384A JP S61142024 A JPS61142024 A JP S61142024A
- Authority
- JP
- Japan
- Prior art keywords
- shaft
- shrink
- temperature
- fit
- fitting
- 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
Landscapes
- Ceramic Products (AREA)
- Turbine Rotor Nozzle Sealing (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、例えば排気ガスタービンのセラミックス製羽
根車を鋼等金属製の軸に結合する場合等に採用されて有
利なセラミック製軸の焼ばめ方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for shrink-fitting a ceramic shaft, which is advantageous when employed, for example, when joining a ceramic impeller of an exhaust gas turbine to a shaft made of metal such as steel. .
今、第１図に示すように、セラミック製の排気ガスター
ビン羽根車の軸１に、鋼等金属製の軸２を外嵌して焼ば
めにより結合し、この焼ばめ結合部が高温の排気ガスに
曝されて稼働するような場合、焼ばめ部に十分な結合強
度を確保するためには、金属製軸２の材質としてその熱
膨張係数が相手方セラミックス製軸１の材質例えば炭化
硅素、窒化硅素と同程度に小さいものであることが望ま
しく、又この場合、所要の焼はめ代を得るためには、焼
ばめ時に、セラミック製軸１と金属製軸２との温度差を
十分に大きくする必要がある。Now, as shown in Fig. 1, a shaft 2 made of metal such as steel is externally fitted onto the shaft 1 of a ceramic exhaust gas turbine impeller and connected by shrink fit, and this shrink fit joint is heated to a high temperature. In order to ensure sufficient bonding strength in the shrink-fitted part when the metal shaft 2 is operated while being exposed to exhaust gas, the thermal expansion coefficient of the material of the metal shaft 2 must be lower than that of the material of the mating ceramic shaft 1, for example, carbonized. It is desirable that the material is as small as silicon or silicon nitride, and in this case, in order to obtain the required shrink fit allowance, the temperature difference between the ceramic shaft 1 and the metal shaft 2 must be reduced during shrink fitting. It needs to be large enough.
しかしながら、セラミックスは一般に熱衝撃に弱く、横
軸に温度差Ｔをとシ縦軸に残存強度Ｓ（曲げ強度）をと
って示した第２図に示すように、温度差がΔＴｃ（以下
臨界温度差と呼称する。勿論この臨界温度差はセラミッ
クスの材質によって異る。）を越えると、強度が極端に
低下する性質がある。これは温度差が臨界温度差を越え
ると、セラミックス内に大きな温度勾配が生じ、この温
度勾配に基づく熱応力によって表面にミクロクラックが
発生し、急激な強度低下を招くことに因るものと推定さ
れる。このために通常の焼ばめ方法によってセラミック
ス製軸１の外側に金属製軸２を焼ばめしたのでは、高温
雰囲気下での稼働時に十分な焼ばめ代を確保することが
できず、結合強度上不安がある。However, ceramics are generally susceptible to thermal shock, and as shown in Figure 2, where the horizontal axis shows the temperature difference T and the vertical axis shows the residual strength S (bending strength), the temperature difference ΔTc (hereinafter referred to as critical temperature Of course, this critical temperature difference varies depending on the material of the ceramic.) If the critical temperature difference is exceeded, the strength will be extremely reduced. This is thought to be due to the fact that when the temperature difference exceeds the critical temperature difference, a large temperature gradient occurs within the ceramic, and thermal stress based on this temperature gradient generates microcracks on the surface, leading to a rapid decrease in strength. be done. For this reason, if the metal shaft 2 is shrink-fitted to the outside of the ceramic shaft 1 using the usual shrink-fitting method, it is not possible to secure a sufficient shrink-fit allowance during operation in a high-temperature atmosphere. There are concerns about the strength of the bond.
本発明は、上記事情に鑑み創案されたもので、セラミッ
クス製軸の外側に金属製部材を焼ばめ結合するに当り、
セラミックス製軸の嵌合部表面近傍を短時間加熱して同
表面付近に予め緩やかな温度勾配を生起させたのち、所
要の焼ばめ温度に加熱された金属製部材を外嵌すること
を特徴とするセラミックス製軸の焼ばめ方法を要旨とす
るものである。The present invention was devised in view of the above circumstances, and when a metal member is shrink-fitted to the outside of a ceramic shaft,
The feature is that the vicinity of the surface of the mating part of the ceramic shaft is heated for a short time to create a gentle temperature gradient in the vicinity of the surface, and then a metal member heated to the required shrink fit temperature is externally fitted. The gist of this paper is a method for shrink-fitting ceramic shafts.
以下本発明方法の実施例を添付図面を参照しながら具体
的に説明する。本発明によれば、予め所定の外形寸度に
成形されたセラミック製軸１の外周表面近傍だけを上記
臨界温度差ΔＴｃより低い所望の温度Ｔ、になるように
短時間急速に加熱し、軸］の表面近傍に予め緩やかな温
度勾配を生起させる。この際、軸１の加熱には、ガスバ
ーナ等を有利に採用することができる。次に加熱炉等適
宜の加熱手段によって所望の焼ばめ温度Ｔ２に加熱した
金属製軸２を軸１の外側に嵌合し、その−１ま放冷する
ことによって焼ばめが行なわれる。軸２の上記焼ばめ温
度Ｔ２は、上記軸１の焼ばめ時の表面温度Ｔ１ との温
度差が臨界温度差ΔＴｏよシ小さくなるように、即ちＴ
２ ’ｒｔ＜ΔＴｃとなるように選択される。このよ
うな焼ばめ方法によれば、金属製軸２をセラミック製軸
１に嵌合する際の温度差がΔＴｃ以下であるために、軸
１の表面にミクロクラックを発生することがなく十分な
強度を確保することができる。又焼ばめに先立って行な
われる軸１の表面の加熱は、表層の僅かな部分に過ぎず
、その内部は作業雰囲気温度例えば室温に略保たれるの
で、この予備的加熱による軸１の外径の膨張は無視し得
る程度に僅かであシ、この結果、外側に嵌合される金属
製軸２に対して十分な焼ばめ代を確保することができ、
従って焼ばめ終了後に高温雰囲気下で稼働する際に強大
な結合強度を得ることができるものである。Embodiments of the method of the present invention will be specifically described below with reference to the accompanying drawings. According to the present invention, only the vicinity of the outer peripheral surface of the ceramic shaft 1, which has been previously formed to have predetermined external dimensions, is rapidly heated for a short period of time to a desired temperature T lower than the critical temperature difference ΔTc. ] A gentle temperature gradient is generated in advance near the surface. At this time, a gas burner or the like can be advantageously employed to heat the shaft 1. Next, the metal shaft 2 heated to a desired shrink fit temperature T2 by an appropriate heating means such as a heating furnace is fitted onto the outside of the shaft 1, and then the metal shaft 2 is allowed to cool by -1, thereby performing the shrink fit. The shrink fit temperature T2 of the shaft 2 is set such that the temperature difference from the surface temperature T1 of the shaft 1 during shrink fit is smaller than the critical temperature difference ΔTo, that is, T
2'rt<ΔTc. According to such a shrink fitting method, since the temperature difference when fitting the metal shaft 2 to the ceramic shaft 1 is less than ΔTc, microcracks are not generated on the surface of the shaft 1 and the temperature difference is sufficient. It is possible to ensure sufficient strength. Furthermore, the heating of the surface of the shaft 1 that is performed prior to shrink fitting is only a small part of the surface layer, and the inside of the shaft is kept approximately at the working atmosphere temperature, for example, room temperature. The expansion of the diameter is so slight that it can be ignored, and as a result, it is possible to secure a sufficient shrink fit allowance for the metal shaft 2 fitted on the outside.
Therefore, strong bonding strength can be obtained when operating in a high temperature atmosphere after shrink fitting.
なお上記実施例は、セラミックス製軸に対して金属製軸
を焼ばめにより結合する場合に関するものであるが、セ
ラミックス製軸に金属製スリーブやブツシュを嵌装固着
したシ、セラミックス製軸を金属製ブラケットやハウジ
ング上に固定する場合等にも広く適用し得るものである
。Note that the above embodiment relates to a case where a metal shaft is joined to a ceramic shaft by shrink fitting, but it is also possible to connect a ceramic shaft to a metal shaft by fitting and fixing a metal sleeve or bushing to the ceramic shaft. It can also be widely applied to cases where it is fixed on a manufactured bracket or housing.
斜上のように本発明に係るセラミックス製軸の焼ばめ方
法は、セラミックス製軸の外側に金属製部材を焼ばめ結
合するに当り、セラミックス製軸の嵌合部表面近傍を短
時間加熱して同表面付近に予め緩やかな温度勾配を生起
させたのち、所要の焼ばめ温度に加熱された金属製部材
を外嵌することを特徴とし、簡素にして安価な手法によ
って常温での稼働は勿論のこと、焼ばめ製品にとっては
苛酷な高温雰囲気下での稼働に際しても十分力結合強度
を確保し得る焼ばめ方法を実現することができるので極
めて有益である。As shown above, the method for shrink-fitting a ceramic shaft according to the present invention involves heating the vicinity of the surface of the fitting part of the ceramic shaft for a short time when shrink-fitting a metal member to the outside of the ceramic shaft. The feature is that after a gentle temperature gradient is generated in advance near the same surface, a metal member heated to the required shrink fit temperature is fitted onto the outside.This is a simple and inexpensive method that allows operation at room temperature. Needless to say, this method is extremely useful for shrink-fit products because it enables a shrink-fit method that can ensure sufficient bonding strength even when operating under a harsh high-temperature atmosphere.
１・・・セラミックス製軸、２・・・金属製軸。 牙１図 牙２図 ’ｒ Ｑ Ｉｃ 1... Ceramic shaft, 2... Metal shaft. Fang 1 Fang 2 'r Q Ic
Claims (1)
に当り、セラミックス製軸の嵌合部表面近傍を短時間加
熱して同表面付近に予め緩やかな温度勾配を生起させた
のち、所要の焼ばめ温度に加熱された金属製部材を外嵌
することを特徴とするセラミックス製軸の焼ばめ方法。When shrink-fitting a metal member to the outside of a ceramic shaft, the vicinity of the fitting surface of the ceramic shaft is heated for a short time to create a gentle temperature gradient in the vicinity of the surface, and then the required temperature is A method for shrink-fitting a ceramic shaft, characterized by externally fitting a metal member heated to a shrink-fitting temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26019384A JPS61142024A (en) | 1984-12-10 | 1984-12-10 | Shrink-fit of ceramic shaft |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26019384A JPS61142024A (en) | 1984-12-10 | 1984-12-10 | Shrink-fit of ceramic shaft |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61142024A true JPS61142024A (en) | 1986-06-28 |
Family
ID=17344619
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26019384A Pending JPS61142024A (en) | 1984-12-10 | 1984-12-10 | Shrink-fit of ceramic shaft |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61142024A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001019558A1 (en) * | 1999-09-16 | 2001-03-22 | Rego-Fix Ag | Device for thermally shrinking tools |
| US6931709B2 (en) * | 2003-07-22 | 2005-08-23 | Scintrex Limited | Method of joining non-metallic and metallic components |
| CN104057244A (en) * | 2014-06-18 | 2014-09-24 | 中信重工机械股份有限公司 | Conical interference-fit assembling method |
-
1984
- 1984-12-10 JP JP26019384A patent/JPS61142024A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2001019558A1 (en) * | 1999-09-16 | 2001-03-22 | Rego-Fix Ag | Device for thermally shrinking tools |
| US6887019B1 (en) | 1999-09-16 | 2005-05-03 | Rego-Fix Ag | Device for thermally shrinking tools |
| US7066696B2 (en) | 1999-09-16 | 2006-06-27 | Rego-Fix Ag | Device for thermally shrinking tools |
| US6931709B2 (en) * | 2003-07-22 | 2005-08-23 | Scintrex Limited | Method of joining non-metallic and metallic components |
| CN104057244A (en) * | 2014-06-18 | 2014-09-24 | 中信重工机械股份有限公司 | Conical interference-fit assembling method |
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