CN103317307B - The bicircular arcs self-locking interference thread method of attachment of titanium aluminium turbine and rotating shaft and structure - Google Patents
The bicircular arcs self-locking interference thread method of attachment of titanium aluminium turbine and rotating shaft and structure Download PDFInfo
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- CN103317307B CN103317307B CN201310250054.9A CN201310250054A CN103317307B CN 103317307 B CN103317307 B CN 103317307B CN 201310250054 A CN201310250054 A CN 201310250054A CN 103317307 B CN103317307 B CN 103317307B
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Abstract
The present invention relates to bicircular arcs self-locking interference thread method of attachment and the syndeton of a kind of titanium aluminium booster turbine impeller and rotating shaft, by designing the bicircular arcs self-locking interference thread syndeton size of titanium aluminium booster turbine impeller and 42CrMo rotating shaft, the magnitude of interference and assembly technology parameter, carry out the machining of bicircular arcs screw thread and counterface and the outer bicircular arcs screw thread of rotating shaft and counterface in turbine wheel, take the measure to turbine wheel heating, the assembling realizing titanium aluminium turbine wheel and 42CrMo rotating shaft is screwed by screw thread, the titanium aluminium turbine shaft connected is carried out to the machining at other positions.Achieve being reliably connected lastingly between titanium-aluminum alloy turbine impeller with the rotating shaft of 42CrMo alloy, meet bonding strength requirement, Structure and energy is simple, is easy to engineer applied.
Description
Technical field
The invention belongs to turbocharging technology field, be specifically related to bicircular arcs self-locking interference thread method 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.The turbine wheel of current diesel engine for automobile booster generally adopts density to be 8.0 × 10
3kg/m
3cast nickel-base alloy K418 material, rotating shaft adopts 42CrMo alloy steel material.For the rotating shaft that the booster turbine impeller manufactured by K418 material and 42CrMo steel alloy manufacture, friction-welding technique can be adopted to realize turbine wheel and to be connected with the reliable of rotating shaft, form turbine shaft.But because K418 density of material is comparatively large, the turbine wheel rotary inertia manufactured by K418 material is also comparatively large, and cause the transient response of exhaust gas turbocharge engine poor, particularly for vehicular engine, turbo lag phenomenon is more obvious.
For improve turbocharged engine transient response, reduce start/accelerate time over-emitting black exhaust phenomenon and improve low engine speed performance, the cast ti al alloy material that turbine wheel can adopt specific strength higher.The density of Ti-Al alloy material is 3.9 × 10
3kg/m
3there is again good high-temperature behavior and antioxygenic property, and elastic modelling quantity is comparatively large, the booster turbine impeller manufactured with titanium aluminum simultaneously, significantly can reduce the rotary inertia of turbocharger rotor, reach the transient response improving turbocharged engine, the object promoting engine performance.But because Ti-Al alloy material belongs to intermetallic compound, adopt conventional welding method, to be difficult to realize between titanium-aluminum alloy turbine impeller with the rotating shaft of 42crMo alloy reliable is connected, and can not meet the bonding strength requirement of booster turbine impeller and rotating shaft.
The patent No. be 97125874.0 with 200810110548.6 these two patents methods of proposing directly to adopt mechanical interference to be connected realize the connection of titanium-aluminum alloy turbine impeller and the rotating shaft of 42CrMo alloy, because the operating temperature of vehicle supercharger turbine impeller and rotating shaft connecting portion is higher, and the fluctuation of booster working speed is comparatively large, the method directly adopting mechanical interference to connect will be difficult to the long-time stability effectively ensureing titanium-aluminum alloy turbine impeller and 42CrMo alloy rotating shaft bonding strength;
The patent No. is patent proposition employing interference thread and the anti-loosening method of attachment combined of pin of 201310166758.8, although the reliable connection of turbine shaft can be realized, but due to needs tooling pin nail and placement pin, its technique is comparatively complicated, and increases the dynamic balancing difficulty of turbine shaft.
Summary of the invention
The present invention is directed to the connectivity problem of titanium aluminium turbine wheel that current Ti-Al alloy material faces in booster turbine application process and 42CrMo rotating shaft, propose bicircular arcs self-locking interference thread method of attachment and the syndeton of a kind of titanium aluminium booster turbine impeller and rotating shaft.
Technical scheme of the present invention:
A bicircular arcs self-locking interference thread method of attachment for titanium aluminium rotating shaft of supercharger turbine, comprises the following steps:
The design of a, turbine wheel and rotating shaft bicircular arcs self-locking thread interference syndeton,
According to titanium aluminium turbine wheel, rotating shaft and the structural parameters of bearing body and the coefficient of friction between turbine material and rotating shaft material, determine the parameters of structural dimension of turbine wheel and shaft thread coupling part, 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 bicircular arcs is threaded;
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;
F, the machining at other positions of turbine shaft connected.
The invention has the beneficial effects as follows:
The bicircular arcs self-locking interference thread method of attachment of titanium aluminium booster turbine and rotating shaft is by appropriate design bicircular arcs screw connection structure dimensional parameters, the magnitude of interference and technological parameter, solve the connectivity problem of titanium aluminium booster turbine impeller and rotating shaft, achieve titanium aluminium turbine wheel and being reliably connected lastingly between 42CrMo rotating shaft.Bicircular arcs self-locking interference thread syndeton combines the feature such as " bicircular arcs ", " self-locking ", " interference ", increase the contact area at screw thread position, improve the bonding strength of screw connection structure, can effectively preventing turbine shaft from operationally relatively rotating when being heated and the fluctuation of speed is larger.Adopt the method for attachment of bicircular arcs self-locking interference thread, both can ensure the bonding strength of booster turbine impeller and rotating shaft, turbine wheel and being threaded in assembling process of rotating shaft can also be made to realize good location.Complete on the basis that turbine wheel and shaft thread assemble, then carrying out the machining at other positions of turbine shaft, the machining accuracy of turbine shaft can improved.The method has that Structure and energy is simple, the bonding strength feature such as reliable lastingly, can meet the through engineering approaches application needs that titanium aluminium booster turbine impeller is connected with rotating shaft.
Accompanying drawing explanation
Fig. 1 is turbine and rotating shaft bicircular arcs self-locking interference thread syndeton schematic diagram
142CrMo alloy rotating shaft 2 titanium aluminium turbine wheel
Fig. 2 is bicircular arcs self-locking interference thread syndeton partial enlarged drawing
Detailed description of the invention
1 pair of turbine and rotating shaft bicircular arcs self-locking interference thread method of attachment and syndeton are described in detail by reference to the accompanying drawings.
The bicircular arcs self-locking interference thread syndeton of a kind of titanium aluminium turbine and rotating shaft, comprise rotating shaft and turbine wheel, described roller end has bicircular arcs self-locking external screw thread, there is the bicircular arcs self-locking internal thread coordinated with roller end bicircular arcs thread interference 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 rotating shaft bicircular arcs interference thread syndeton adopts the lead angle of 3 °, can realize screw thread self-locking.
A bicircular arcs self-locking interference thread method of attachment for titanium aluminium booster turbine impeller and rotating shaft, comprises the following steps:
The design of a, titanium aluminium turbine wheel and rotating shaft bicircular arcs self-locking interference thread syndeton: according to turbine wheel, rotating shaft and the structural parameters of bearing body and the coefficient of friction between turbine material and rotating shaft material, determine the parameters of structural dimension of turbine wheel and shaft thread coupling part, viewed 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 the bicircular arcs self-locking interference thread syndeton of turbine shaft;
The machining of b, titanium aluminium turbine wheel bicircular arcs internal thread and counterface: the dimensional parameters determined according to step a, processes titanium aluminium turbine wheel bicircular arcs self-locking internal thread and counterface A;
The machining of c, 42CrMo rotating shaft bicircular arcs external screw thread and counterface: the dimensional parameters determined according to step a, adopts the bicircular arcs self-locking external screw thread of milling with whirling cutter processing mode countershaft to process, and processes end face A;
D, titanium aluminium turbine wheel heat: adopt oil bath mode of heating to carry out entirety heating to titanium aluminium turbine wheel, ensure that turbine wheel is heated evenly; Heating-up temperature is between 180 DEG C-200 DEG C, and the heat time is about 15 minutes, ensures turbine wheel heat penetration;
The Screw assembly of e, titanium aluminium turbine wheel and the rotating shaft of 42CrMo alloy: the mode that the titanium aluminium turbine wheel heated and the rotating shaft of 42CrMo alloy are screwed by screw thread is linked together;
F, the machining at other positions of turbine shaft connected: according to the structural parameters requirement of turbine shaft, the turbine shaft connected is carried out to the machining at other positions.
The bicircular arcs screw thread of 2 pairs of turbines and rotating shaft bicircular arcs self-locking interference thread syndeton further illustrates by reference to the accompanying drawings.
Bicircular arcs screw thread refers to that the tooth form of screw thread is circular arc, and namely the first half of screw thread is the semicircle that radius is identical with the latter half respectively.After internal and external threads screws, externally threaded crest circular arc coordinates with circular arc at the bottom of the tooth of internal thread, circular arc at the bottom of externally threaded tooth coordinates with the crest circular arc of internal thread, make the contact area of the contact area rate regular screw threads, trapezoidal thread etc. of internal and external threads larger, frictional resistance can be increased, effectively prevent internal and external threads from getting loose, prevent turbine and rotating shaft from coming off.
Claims (1)
1. a bicircular arcs self-locking interference thread method of attachment for titanium aluminium turbine and rotating shaft, comprises the following steps:
The design of a, turbine wheel and rotating shaft bicircular arcs self-locking interference thread syndeton, described roller end has bicircular arcs self-locking external screw thread, and there is the bicircular arcs self-locking internal thread coordinated with roller end bicircular arcs thread interference turbine wheel and rotating shaft junction; The first half and the latter half of bicircular arcs self-locking interference thread are the semicircle that radius is identical respectively; The internal and external threads of turbine wheel and rotating shaft bicircular arcs interference thread syndeton adopts the lead angle of 3 °; According to titanium aluminium turbine wheel, rotating shaft and the structural parameters of bearing body and the coefficient of friction between turbine material and rotating shaft material, determine the parameters of structural dimension of turbine wheel and shaft thread coupling part, from turbine end, thread rotary orientation is identical with the rotation direction of rotating shaft; The maximum working torque born according to thermal coefficient of expansion and the turbine shaft of turbine wheel material and rotating shaft material and maximum operating temperature, determine the magnitude of interference that bicircular arcs is threaded, the interference rate of described internal and external threads is 0.005-0.009;
The machining of b, titanium aluminium turbine wheel bicircular arcs internal thread and counterface;
The machining of the outer bicircular arcs external screw thread of c, 42CrMo rotating shaft and counterface, machining mode is milling with whirling cutter processing;
D, titanium aluminium turbine wheel heat, and adopt oil bath mode of heating to carry out entirety heating to titanium aluminium turbine wheel, the heating-up temperature of oil bath heating is 180 DEG C-200 DEG C, and the heat time is 15 minutes;
The Screw assembly of e, titanium aluminium turbine wheel and the rotating shaft of 42CrMo alloy;
F, the machining at other positions of turbine shaft connected.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| CN103317307B true CN103317307B (en) | 2015-10-21 |
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Families Citing this family (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 |
| 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 |
| CN105666144B (en) * | 2016-03-24 | 2018-03-13 | 中国北方发动机研究所(天津) | Combined booster turbine shaft and its method for processing and assembling |
| 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 |
| 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 |
| 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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| US4986733A (en) * | 1989-10-30 | 1991-01-22 | Allied-Signal, Inc. | Turbocharger compressor wheel assembly with boreless hub compressor wheel |
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| 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 |
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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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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| 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 |
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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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| CN103317307A (en) | 2013-09-25 |
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