CN103317307A - Bi-arc self-locking interference threaded connection method and structure for titanium aluminum turbine and spindle - Google Patents
Bi-arc self-locking interference threaded connection method and structure for titanium aluminum turbine and spindle Download PDFInfo
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- CN103317307A CN103317307A CN2013102500549A CN201310250054A CN103317307A CN 103317307 A CN103317307 A CN 103317307A CN 2013102500549 A CN2013102500549 A CN 2013102500549A CN 201310250054 A CN201310250054 A CN 201310250054A CN 103317307 A CN103317307 A CN 103317307A
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Abstract
The invention relates to a bi-arc self-locking interference threaded connection method and structure for a titanium aluminum turbine and a spindle. By designing the size, the interference magnitude and assembly technological parameters of a bi-arc self-locking interference threaded connection structure for a titanium aluminum supercharger turbine impeller and a 42 CrMo spindle, machining is performed on turbine impeller internal bi-arc threads and a matching end surface as well as spindle external bi-arc threads and a matching end surface. A turbine impeller heating measure is taken, assembly for the titanium aluminum turbine impeller and the 42 CrMo spindle is achieved through thread screwing, and machining is performed on other positions of the connected titanium aluminum spindle. By means of the connection method and structure, lasting reliable connection between the titanium aluminum turbine impeller and the 42 CrMo alloy spindle is achieved, connection strength requirements are met, the structure and the technology are simple, and the engineering application is facilitated.
Description
Technical field
The invention belongs to the turbocharging technology field, be specifically related to two circular arc self-locking interference thread methods of attachment and the syndeton of a kind of titanium aluminium booster turbine impeller and rotating shaft.
Background technology
Turbine shaft is one of kernel component of turbocharger, by turbine wheel and rotating shaft by being formed by connecting.It is 8.0 * 10 that the turbine wheel of present diesel engine for automobile booster generally adopts density
3Kg/m
3Cast nickel-base alloy K418 material, the 42CrMo alloy steel material is adopted in rotating shaft.For the rotating shaft of the booster turbine impeller of being made by the K418 material and the manufacturing of 42CrMo steel alloy, can adopt friction-welding technique to realize that turbine wheel is connected with the reliable of rotating shaft, form turbine shaft.Yet because the K418 density of material is larger, the turbine wheel rotary inertia of being made by the K418 material is also larger, causes the transient response of exhaust gas turbocharge engine relatively poor, and particularly for vehicular engine, the turbo lag phenomenon is more obvious.
For the transient response that improves turbocharged engine, reduce the over-emitting black exhaust phenomenon of starting/when accelerating and improve the low engine speed performance, turbine wheel can adopt the higher cast ti al alloy material of specific strength.The density of Ti-Al alloy material is 3.9 * 10
3Kg/m
3Simultaneously have again good high-temperature behavior and antioxygenic property, and elastic modelling quantity is larger, with the booster turbine impeller of titanium aluminum manufacturing, the rotary inertia of turbocharger rotor be can significantly reduce, the transient response that improves turbocharged engine, the purpose that promotes engine performance reached.But because Ti-Al alloy material belongs to intermetallic compound, adopt conventional welding method, be difficult to realize reliable connection the between titanium-aluminum alloy turbine impeller and the rotating shaft of 42crMo alloy, can not satisfy the bonding strength requirement of booster turbine impeller and rotating shaft.
The patent No. is 97125874.0 to realize being connected of titanium-aluminum alloy turbine impeller and the rotating shaft of 42CrMo alloy with method that these two patents of being connected propose directly to adopt mechanical interference to connect, because the operating temperature of vehicle supercharger turbine impeller and rotating shaft connecting portion is higher, and the fluctuation of booster working speed is larger, and the method that directly adopts mechanical interference to connect will be difficult to effectively guarantee the long-time stability of titanium-aluminum alloy turbine impeller and 42CrMo alloy rotating shaft bonding strength;
The patent No. is 201310166758.8 patent proposition employing interference thread and the anti-loosening method of attachment that combines of pin, although can realize the reliable connection of turbine shaft, but owing to needing the processing pin hole and placing pin, its technique is comparatively complicated, and has strengthened the dynamic balancing difficulty of turbine shaft.
Summary of the invention
The present invention is directed to titanium aluminium turbine wheel that present Ti-Al alloy material faces and the connectivity problem of 42CrMo rotating shaft in the booster turbine application process, propose two circular arc self-locking interference thread methods of attachment and the syndeton of a kind of titanium aluminium booster turbine impeller and rotating shaft.
Technical scheme of the present invention:
A kind of two circular arc self-locking interference thread method of attachment of titanium aluminium rotating shaft of supercharger turbine may further comprise the steps:
The design of the two circular arc self-locking thread interference syndetons of a, turbine wheel and rotating shaft,
According to the structural parameters of titanium aluminium turbine wheel, rotating shaft and bearing body and the coefficient of friction between turbine material and the rotating shaft material, determine turbine wheel be threaded with rotating shaft the part parameters of structural dimension, from turbine end, thread rotary orientation is identical with the rotation direction of booster rotating shaft; According to the maximum working torque that thermal coefficient of expansion and the turbine shaft of turbine wheel material and rotating shaft material are born, determine the magnitude of interference that two circular threads connect;
The machining of b, titanium aluminium turbine wheel internal thread and counterface;
The machining of c, rotating shaft external screw thread and counterface;
The heating of d, titanium aluminium turbine wheel;
The Screw assembly of e, titanium aluminium turbine wheel and the rotating shaft of 42CrMo alloy screws;
The machining at f, other positions of turbine shaft of having connected.
The invention has the beneficial effects as follows:
Two circular arc self-locking interference thread method of attachment of titanium aluminium booster turbine and rotating shaft is by the two circular thread syndeton dimensional parameters of appropriate design, the magnitude of interference and technological parameter, solved the connectivity problem of titanium aluminium booster turbine impeller and rotating shaft, realized that lasting between titanium aluminium turbine wheel and the 42CrMo rotating shaft reliably is connected.Two circular arc self-locking interference thread syndetons combine the characteristics such as " two circular arc ", " self-locking ", " interference ", increased the contact area at screw thread position, improve the bonding strength of screw connection structure, can effectively prevent turbine shaft in the situation that when work is being heated and the fluctuation of speed is larger relatively rotates.Adopt two circular arc self-locking interference thread methods of attachment, both can guarantee the bonding strength of booster turbine impeller and rotating shaft, can also make being threaded in of turbine wheel and rotating shaft realize good location in the assembling process.On the basis of finishing turbine wheel and rotating shaft Screw assembly, carry out again the machining at other positions of turbine shaft, can improve the machining accuracy of turbine shaft.The characteristics such as the method has structure and technique is simple, bonding strength is lastingly reliable can satisfy the through engineering approaches application needs that titanium aluminium booster turbine impeller is connected with rotating shaft.
Description of drawings
Fig. 1 is the two circular arc self-locking interference thread syndeton schematic diagrames of turbine and rotating shaft
142CrMo alloy rotating shaft 2 titanium aluminium turbine wheels
Fig. 2 is two circular arc self-locking interference thread syndeton partial enlarged drawings
The specific embodiment
The two circular arc self-locking interference thread methods of attachment of the 1 pair of turbine and rotating shaft and syndeton are elaborated by reference to the accompanying drawings.
Two circular arc self-locking interference thread syndetons of a kind of titanium aluminium turbine and rotating shaft, comprise rotating shaft and turbine wheel, described roller end has two circular arc self-locking external screw threads, there are the two circular arc self-locking internal threads with the two circular thread interference fit of roller end turbine wheel and rotating shaft junction, and the interference rate of described internal and external threads is 0.005-0.009.
The interference rate of screw thread refers to the ratio of the magnitude of interference and screw thread nominal diameter.
The internal and external threads of preferred turbine wheel and the two circular arc interference thread syndetons of rotating shaft adopts 3 ° lead angle, can realize screw thread self-locking.
Two circular arc self-locking interference thread method of attachment of a kind of titanium aluminium booster turbine impeller and rotating shaft may further comprise the steps:
The design of the two circular arc self-locking interference thread syndetons of a, titanium aluminium turbine wheel and rotating shaft: according to the structural parameters of turbine wheel, rotating shaft and bearing body and the coefficient of friction between turbine material and the rotating shaft material, determine turbine wheel be threaded with rotating shaft the part parameters of structural dimension, see that from turbine end thread rotary orientation is identical with the rotation direction of rotating shaft; According to the maximum working torque that thermal coefficient of expansion and the turbine shaft of turbine wheel material and rotating shaft material are born, determine the magnitude of interference of two circular arc self-locking interference thread syndetons of turbine shaft;
The machining of b, the two circular arc internal threads of titanium aluminium turbine wheel and counterface: according to the dimensional parameters that step a determines, the two circular arc self-locking internal threads of titanium aluminium turbine wheel and counterface A are processed;
The machining of c, the two circular arc external screw threads of 42CrMo rotating shaft and counterface: according to the dimensional parameters that step a determines, adopt two circular arc self-locking external screw threads of milling with whirling cutter processing mode countershaft to process, and end face A is processed;
D, the heating of titanium aluminium turbine wheel: adopt the oil bath mode of heating that titanium aluminium turbine wheel is carried out the integral body heating, guarantee that turbine wheel is heated evenly; Heating-up temperature is that be about 15 minutes heat time heating time between 180 ℃-200 ℃, guarantees the turbine wheel heat penetration;
The Screw assembly of e, titanium aluminium turbine wheel and the rotating shaft of 42CrMo alloy: the titanium aluminium turbine wheel and the rotating shaft of 42CrMo alloy that heat are linked together by the mode that screw thread screws;
The machining at f, other positions of turbine shaft of having connected: according to the structural parameters requirement of turbine shaft, the turbine shaft that has connected is carried out the machining at other positions.
Two circular threads of the two circular arc self-locking interference thread syndetons of the 2 pairs of turbines and rotating shaft further specify by reference to the accompanying drawings.
Two circular threads refer to that the tooth form of screw thread is circular arc, and namely the first half of screw thread is respectively the identical semicircle of radius with the latter half.After internal and external threads screws, circular arc cooperates at the bottom of the tooth of externally threaded crest circular arc and internal thread, circular arc cooperates with the crest circular arc of internal thread at the bottom of the externally threaded tooth, so that the contact area of the contact area rate regular screw threads of internal and external threads, trapezoidal thread etc. is larger, can increase frictional resistance, prevent that effectively internal and external threads from getting loose, prevent that turbine and rotating shaft from coming off.
Claims (7)
1. two circular arc self-locking interference thread method of attachment of a titanium aluminium turbine and rotating shaft may further comprise the steps:
The design of the two circular arc self-locking interference thread syndetons of a, turbine wheel and rotating shaft, according to the structural parameters of titanium aluminium turbine wheel, rotating shaft and bearing body and the coefficient of friction between turbine material and the rotating shaft material, determine turbine wheel be threaded with rotating shaft the part parameters of structural dimension, from turbine end, thread rotary orientation is identical with the rotation direction of rotating shaft; According to maximum working torque and the maximum operating temperature that thermal coefficient of expansion and the turbine shaft of turbine wheel material and rotating shaft material are born, determine the magnitude of interference that two circular threads connect;
The machining of b, the two circular arc internal threads of titanium aluminium turbine wheel and counterface;
The machining of c, the outer two circular arc external screw threads of 42CrMo rotating shaft and counterface;
D, the heating of titanium aluminium turbine wheel;
The Screw assembly of e, titanium aluminium turbine wheel and the rotating shaft of 42CrMo alloy;
The machining at f, other positions of turbine shaft of having connected.
2. two circular arc self-locking interference thread method of attachment of titanium aluminium turbine according to claim 1 and rotating shaft is characterized in that: the machining mode among the described step c is milling with whirling cutter processing.
3. two circular arc self-locking interference thread method of attachment of titanium aluminium turbine according to claim 1 and rotating shaft is characterized in that: adopt the oil bath mode of heating that titanium aluminium turbine wheel is carried out the integral body heating in the described steps d.
4. two circular arc self-locking interference thread method of attachment of titanium aluminium turbine according to claim 3 and rotating shaft is characterized in that: the heating-up temperature of oil bath heating is 180 ℃-200 ℃, and be 15 minutes heat time heating time.
5. two circular arc self-locking interference thread syndetons of a titanium aluminium turbine and rotating shaft, comprise rotating shaft and turbine wheel, it is characterized in that, described roller end has two circular arc self-locking external screw threads, there are the two circular arc self-locking internal threads with the two circular thread interference fit of roller end turbine wheel and rotating shaft junction, and the interference rate of described internal and external threads is 0.005-0.009.
6. two circular arc self-locking interference thread syndetons of titanium aluminium turbine according to claim 5 and rotating shaft, it is characterized in that: the first half of two circular arc self-locking interference threads is respectively the identical semicircle of radius with the latter half.
7. two circular arc self-locking interference thread syndetons of titanium aluminium turbine according to claim 5 and rotating shaft is characterized in that: the lead angle that the internal and external threads employing of the two circular arc interference thread syndetons of turbine wheel and rotating shaft is 3 °.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310250054.9A CN103317307B (en) | 2013-06-10 | 2013-06-10 | The bicircular arcs self-locking interference thread method of attachment of titanium aluminium turbine and rotating shaft and structure |
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| CN201310250054.9A CN103317307B (en) | 2013-06-10 | 2013-06-10 | The bicircular arcs self-locking interference thread method of attachment of titanium aluminium turbine and rotating shaft and structure |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103758782A (en) * | 2013-12-30 | 2014-04-30 | 常州环能涡轮动力股份有限公司 | Compressor impeller of small-sized turbosuperchager |
| CN103846613A (en) * | 2014-02-12 | 2014-06-11 | 中国北方发动机研究所(天津) | Connection method and connection structure of tapered threads of impeller and rotating shaft of turbine of supercharger |
| CN105666144A (en) * | 2016-03-24 | 2016-06-15 | 中国北方发动机研究所(天津) | Composite supercharger turbine rotating shaft and machining assembly method thereof |
| CN110131033A (en) * | 2019-04-02 | 2019-08-16 | 中国北方发动机研究所(天津) | A kind of turbine interference connection stress smoothly transits structure |
| CN114135339A (en) * | 2021-11-26 | 2022-03-04 | 中国北方发动机研究所(天津) | Profile connecting method for turbine impeller and rotating shaft |
| CN114776386A (en) * | 2022-04-29 | 2022-07-22 | 中国北方发动机研究所(天津) | Cone connecting structure of titanium-aluminum turbine and rotating shaft |
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| CN1748931A (en) * | 2005-09-29 | 2006-03-22 | 哈尔滨工业大学 | High strength connecting method for TiAl base alloy charging turbine and steel shaft |
| CN101596665A (en) * | 2008-06-03 | 2009-12-09 | 中国兵器工业集团第七○研究所 | The process that a kind of titanium-aluminum alloy turbine rotating shaft three body structures connect |
| CN101813098A (en) * | 2010-01-21 | 2010-08-25 | 重庆德蚨乐机械制造有限公司 | Connecting structure for compressor impeller and rotor spindle of turbocharger |
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| CN102829145A (en) * | 2012-09-07 | 2012-12-19 | 西北工业大学 | Planetary roller screw pair capable of being self-locked |
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| US4986733A (en) * | 1989-10-30 | 1991-01-22 | Allied-Signal, Inc. | Turbocharger compressor wheel assembly with boreless hub compressor wheel |
| DE4444082A1 (en) * | 1994-12-10 | 1996-06-13 | Abb Management Ag | Engine exhaust turbocharger |
| CN1748931A (en) * | 2005-09-29 | 2006-03-22 | 哈尔滨工业大学 | High strength connecting method for TiAl base alloy charging turbine and steel shaft |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103758782A (en) * | 2013-12-30 | 2014-04-30 | 常州环能涡轮动力股份有限公司 | Compressor impeller of small-sized turbosuperchager |
| CN103846613A (en) * | 2014-02-12 | 2014-06-11 | 中国北方发动机研究所(天津) | Connection method and connection structure of tapered threads of impeller and rotating shaft of turbine of supercharger |
| CN103846613B (en) * | 2014-02-12 | 2016-06-15 | 中国北方发动机研究所(天津) | The tapered tread method of attachment of booster turbine impeller and rotating shaft and attachment structure |
| CN105666144A (en) * | 2016-03-24 | 2016-06-15 | 中国北方发动机研究所(天津) | Composite supercharger turbine rotating shaft and machining assembly method thereof |
| CN110131033A (en) * | 2019-04-02 | 2019-08-16 | 中国北方发动机研究所(天津) | A kind of turbine interference connection stress smoothly transits structure |
| CN114135339A (en) * | 2021-11-26 | 2022-03-04 | 中国北方发动机研究所(天津) | Profile connecting method for turbine impeller and rotating shaft |
| CN114135339B (en) * | 2021-11-26 | 2023-04-25 | 中国北方发动机研究所(天津) | Contour profile connecting method for turbine impeller and rotating shaft |
| CN114776386A (en) * | 2022-04-29 | 2022-07-22 | 中国北方发动机研究所(天津) | Cone connecting structure of titanium-aluminum turbine and rotating shaft |
| CN114776386B (en) * | 2022-04-29 | 2023-05-19 | 中国北方发动机研究所(天津) | Cone connection structure of titanium aluminum turbine and rotating shaft |
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| CN103317307B (en) | 2015-10-21 |
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