CN101895164A - Copper-base alloy rotor slot wedge for high-power turbonator and processing process thereof - Google Patents
Copper-base alloy rotor slot wedge for high-power turbonator and processing process thereof Download PDFInfo
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- CN101895164A CN101895164A CN 201010224738 CN201010224738A CN101895164A CN 101895164 A CN101895164 A CN 101895164A CN 201010224738 CN201010224738 CN 201010224738 CN 201010224738 A CN201010224738 A CN 201010224738A CN 101895164 A CN101895164 A CN 101895164A
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Abstract
The invention discloses a copper-base alloy rotor slot wedge for a high-power turbonator and a processing process thereof, belonging to the technical field of generator rotors. The copper-base alloy rotor slot wedge of the high-power turbonator is made of materials containing the following elements in percentage by weight: 1.6-2.5% of Ni, 0.4-0.8% of Si, Fe<=0.2%, Pb<=0.2%, Mn<=0.1%, the balance of copper and impurities<=0.3%. The materials are sequentially subjected to processes, i.e. vacuum melting, element matching, ingot casting, extrusion for forming a rod and heterogenic mould cold draw to directly obtain the needed outline dimension of the rotor slot wedge. Compared with the prior art, the invention provides a copper-base alloy which has abundant natural resources and low price and is used for manufacturing the rotor slot wedge of the high-power turbonator; when the copper-base alloy is used for manufacturing the rotor slot wedge, manufacturing process is simple, and combination property is excellent; and in addition, the copper-base alloy can basically substitute the traditional material and has higher economical efficiency.
Description
Technical field
The present invention relates to a kind of generator amature, especially relate to a kind of copper-base alloy rotor slot wedge for high-power turbonator and processing technology thereof.
Background technology
Rotor slot wedge is a vital part in the rotor of steam turbo generator damping system, when turbo generator moves, and the huge centrifugal force that it will be accepted coil in the rotor slot and insulating part and self produce because of high speed rotating.Under the negative phase-sequence rotating magnetic field effect that stator current produces, especially when faults such as generator generation unsymmetrical short-circuit, can bigger induced current occur at rotor surface in addition, this electric current slot wedge of flowing through can make it produce higher temperature rise.For guaranteeing the security reliability under the especially improper operating mode of turbo generator operation, alloy material as rotor slot wedge must have higher electric conductivity, and the intensity under room temperature and the high temperature and mould, toughness, the power of generator is big more, and is just strong more to the requirement of correlated performance.
The main material of prior art rotor slot wedge has aluminum and copper-based alloy material, the aluminium low price, but resistivity is big, conductivity is low, the generator that can only be used for smaller power, what copper-based alloy material was mainly selected for use is beryllium cobalt zirconium acid bronze alloy, composition is Co 2.3～2.7%, and Be 0.45～0.7%, and Zr 0.2～0.3%, the Cu surplus, impurity≤0.3% is though this kind acid bronze alloy can satisfy basic demand, Co, material price costlinesses such as Be, and stronger radioactivity is arranged, produce and the course of processing in to human body, all there is certain harmfulness in environment.
Chinese patent " large-capacity steam turbine generator rotor copper alloy slot wedge and preparation method thereof ", number of patent application are 200510123011.x, a kind of acid bronze alloy that is used for large turbo-type generator upper rotor part slot wedge is disclosed, the percentage by weight Ni 1.35～2.05% of each element wherein, Si 0.40～0.80%, Cr 0.05～0.25%, Be 0.15～0.4%, surplus is a copper, this kind acid bronze alloy is compared with above-mentioned beryllium cobalt zirconium acid bronze alloy, though reduced the content of coherent element, still used harmful and expensive Be to human body and environment.
The slot wedge relative size of using on high-power generator is bigger, when the processing slot wedge, is subjected to the restriction of processing length, one whole slot wedge segmental machining need be subjected to the influence of machining shape, increases mill, miller skill, thereby difficulty of processing is increased, and working (machining) efficiency is low; When assembling, need each section slot wedge is formed one, assembly difficulty is increased, assembly precision is limited.Be subjected to the restriction of factors such as raw material, size and dimension, the rate of finished products of rotor slot wedge is relatively low, and its processing technology requires very strict.
Summary of the invention
Technical assignment of the present invention is at the deficiencies in the prior art, provide a kind of ABUNDANT NATUREAL RESOURSES, cheap, be used to make the acid bronze alloy of high power turbine generator upper rotor part slot wedge, simple, the high comprehensive performance of manufacturing process when making rotor slot wedge with this kind acid bronze alloy, substantially can substitute current material, have higher economical efficiency.
The technical solution adopted for the present invention to solve the technical problems is: a kind of copper-base alloy rotor slot wedge for high-power turbonator, it is characterized in that, the percentage by weight of each element is in the described acid bronze alloy: Ni:1.6～2.5%, Si:0.4～0.8%, Fe :≤0.2%, Pb :≤0.02%, Mn :≤0.1%, all the other are copper, impurity≤0.3%.
The processing technology of above-mentioned copper-base alloy rotor slot wedge for high-power turbonator, carry out according to following procedure of processing:
1), designs the profile of required rotor slot wedge according to the size and the dimensional requirement of generator capacity;
2) cathode copper is joined carry out melting in the Medium frequency induction vacuum melting furnace, and, regulate its content in weight percentage ranges separately, smelting temperature: 1180～1220 ℃ to wherein adding Ni, Si, Fe, Pb and Mn, smelting time: 60～80min melts out needed ingot casting;
3) heating ingot casting, the ingot casting after the heating squeezes out the metal bar bigger slightly than the overall dimension of required rotor slot wedge on extruder, the described minimum profile size metal bar of calculating by certain extensibility meter that is meant slightly greatly;
4) adopt special-shaped mould cold-drawn technology metal bar to be carried out cold drawing, obtain the overall dimension of needed rotor slot wedge by drawing die.
Copper-base alloy rotor slot wedge for high-power turbonator of the present invention and processing technology thereof compared with prior art, the beneficial effect that is produced is:
1) rotor slot wedge of the present invention has reduced the resistivity of conductor, has improved high-temperature mechanical property, and the tensile strength maximum can reach 700N/mm
2, conductance is not less than 30%, and Brinell hardness is greater than 180.
2) rotor slot wedge of the present invention and large-capacity steam turbine generator rotor CuCo2BeZr alloy phase ratio commonly used, its cost has reduced more than 50%, has saved the noble element resource, has significantly reduced the pollution to environment.
3) processing technology of the present invention adopts special-shaped mould cold-drawn technology, makes the overall dimension of product, surface roughness can directly reach technological requirement, and can directly obtain needed rotor slot wedge length.
Description of drawings
Accompanying drawing 1 is the theory structure schematic diagram of processing technology of the present invention; Accompanying drawing 2 is that the A-A of Fig. 1 is to the sectional structure schematic diagram.Among the figure, 1 expression drawing die, 2 expression rotor slot wedges.
Embodiment
Explain below in conjunction with 1,2 pairs of copper-base alloy rotor slot wedge for high-power turbonator of the present invention of accompanying drawing and below the processing technology work.
Shown in accompanying drawing 1,2, copper-base alloy rotor slot wedge for high-power turbonator of the present invention, its profile is decided according to the size and the dimensional requirement of generator capacity, material is a kind of Ni of containing, Si, Fe, Pb, Mn, all the other are the acid bronze alloy of Cu, also has inevitable small amount of impurities, the percentage by weight of above-mentioned various elements is: Ni:1.6～2.5%, Si:0.4～0.8%, Fe :≤0.2%, Pb :≤0.02%, Mn :≤0.1%, all the other are copper, and total impurities is not more than 0.3%.
Embodiment 1:
Material chemical analysis: Ni:2.5% Si:0.8% Fe: 0.15% Pb:0., 008% Mn:0.06%, process according to following steps:
1), designs the profile of required rotor slot wedge according to the size and the dimensional requirement of generator capacity.
2) cathode copper is joined carry out melting in the Medium frequency induction vacuum melting furnace, and, regulate its content in weight percentage ranges separately, smelting temperature: 1180～1220 ℃ to wherein adding Ni, Si, Fe, Pb and Mn, smelting time: 60～80min melts out needed ingot casting.
3) heating ingot casting, ingot casting is heated to 900 ℃ after, on extruder, squeeze out the metal bar bigger slightly than the overall dimension of required rotor slot wedge, the cross-sectional area of extrusion billet is 1.5 times of finished size, guarantees that cold working rate is not less than 45%.
4) adopt special-shaped mould cold-drawn technology to carry out cold drawing, obtain the overall dimension of needed rotor slot wedge 2 by 1 pair of metal bar of drawing die.
5) under 450 ℃ temperature, be incubated 4 hours, this material is carried out Ageing Treatment.
This acid bronze alloy comprehensive mechanical performance sees Table one:
Table one
| Performance index | Unit | Room temperature (25 ℃) |
| Tensile strength | Mpa | 700 |
| Yield strength | Mpa | 580 |
| Microhardness HV | ? | 220 |
| Conductivity | %IACS | 43 |
| Elongation | % | 11 |
Example 2:
Material chemical composition: Ni:2.2% Si:0.5% Fe: 0.12% Pb:0.007% Mn:0.05%, process according to following steps:
1), designs the profile of required rotor slot wedge according to the size and the dimensional requirement of generator capacity.
2) cathode copper is joined carry out melting in the Medium frequency induction vacuum melting furnace, and, regulate its content in weight percentage ranges separately, smelting temperature: 1180～1220 ℃ to wherein adding Ni, Si, Fe, Pb and Mn, smelting time: 60～80min melts out needed ingot casting.
3) heating ingot casting, ingot casting is heated to 900 ℃ after, on extruder, squeeze out the metal bar bigger slightly than the overall dimension of required rotor slot wedge, the cross-sectional area of extrusion billet is 1.5 times of finished size, guarantees that cold working rate is not less than 45%.
4) adopt special-shaped mould cold-drawn technology to carry out cold drawing, obtain the overall dimension of needed rotor slot wedge 2 by 1 pair of metal bar of drawing die.
5) under 450 ℃ temperature, be incubated 4 hours, this material is carried out Ageing Treatment.
This acid bronze alloy comprehensive mechanical performance sees Table two:
Table two
| Performance index | Unit | Room temperature (25 ℃) |
| Tensile strength | Mpa | 650 |
| Yield strength | Mpa | 580 |
| Microhardness HV | ? | 210 |
| Conductivity | %IACS | 44 |
| Elongation | % | 13 |
Example 3:
Material chemical composition: Ni:1.6% Si:0.4% Fe: 0.13% Pb:0.006% Mn:0.08%, process according to following steps:
1), designs the profile of required rotor slot wedge according to the size and the dimensional requirement of generator capacity.
2) cathode copper is joined carry out melting in the Medium frequency induction vacuum melting furnace, and, regulate its content in weight percentage ranges separately, smelting temperature: 1180～1220 ℃ to wherein adding Ni, Si, Fe, Pb and Mn, smelting time: 60～80min melts out needed ingot casting.
3) heating ingot casting, ingot casting is heated to 900 ℃ after, on extruder, squeeze out the metal bar bigger slightly than the overall dimension of required rotor slot wedge, the cross-sectional area of extrusion billet is 1.5 times of finished size, guarantees that cold working rate is not less than 45%.
4) adopt special-shaped mould cold-drawn technology to carry out cold drawing, obtain the overall dimension of needed rotor slot wedge 2 by 1 pair of metal bar of drawing die.
5) under 450 ℃ temperature, be incubated 4 hours, this material is carried out Ageing Treatment.
This acid bronze alloy combination property sees Table three:
Table three
| Performance index | Unit | Room temperature (25 ℃) |
| Tensile strength | Mpa | 650 |
| Yield strength | Mpa | 580 |
| Microhardness HV | ? | 200 |
| Conductivity | %IACS | 48 |
| Elongation | % | 12 |
The processing technology of above-mentioned copper-base alloy rotor slot wedge for high-power turbonator, carry out according to following procedure of processing:
1), designs the profile of required rotor slot wedge according to the size and the dimensional requirement of generator capacity.
2) cathode copper is joined carry out melting in the Medium frequency induction vacuum melting furnace, and, regulate its content in weight percentage ranges separately, smelting temperature: 1180～1220 ℃ to wherein adding Ni, Si, Fe, Pb and Mn, smelting time: 60～80min melts out needed ingot casting.
3) heating ingot casting, ingot casting is heated to 900 ℃ after, on extruder, squeeze out the metal bar bigger slightly than the overall dimension of required rotor slot wedge, the cross-sectional area of extrusion billet is 1.5 times of finished size, guarantees that cold working rate is not less than 45%.
4) adopt special-shaped mould cold-drawn technology to carry out cold drawing, obtain the overall dimension of needed rotor slot wedge 2 by 1 pair of metal bar of drawing die.
5) under 450 ℃ temperature, be incubated 4 hours, this material is carried out Ageing Treatment.
Certainly, above-mentioned explanation is not a limitation of the present invention, and the present invention also is not limited only to above-mentioned giving an example, and variation, remodeling, interpolation or replacement that those skilled in the art are made in essential scope of the present invention also belong to protection scope of the present invention.
Claims (2)
1. a copper-base alloy rotor slot wedge for high-power turbonator is characterized in that, the percentage by weight of each element is in the described acid bronze alloy: Ni:1.6～2.5%, Si:0.4～0.8%, Fe :≤0.2%, Pb :≤0.02%, Mn :≤0.1%, all the other are copper, impurity≤0.3%.
2. the processing technology of a copper-base alloy rotor slot wedge for high-power turbonator as claimed in claim 1 is characterized in that, described rotor slot wedge carries out according to following procedure of processing:
1), designs the profile of required rotor slot wedge according to the size and the dimensional requirement of generator capacity;
2) cathode copper is joined carry out melting in the Medium frequency induction vacuum melting furnace, and, regulate its content in weight percentage ranges separately to wherein adding Ni, Si, Fe, Pb and Mn; Smelting temperature: 1180～1220 ℃, smelting time: 60～80min melts out needed ingot casting;
3) heating ingot casting, the ingot casting after the heating squeezes out the metal bar bigger slightly than the overall dimension of required rotor slot wedge on extruder, the described minimum profile size metal bar of calculating by certain extensibility meter that is meant slightly greatly;
4) adopt special-shaped mould cold-drawn technology metal bar to be carried out cold drawing, obtain the overall dimension of needed metallic rotator slot wedge by drawing die.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010224738 CN101895164A (en) | 2009-07-28 | 2010-07-13 | Copper-base alloy rotor slot wedge for high-power turbonator and processing process thereof |
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| CN200910017276 | 2009-07-28 | ||
| CN200910017276.X | 2009-07-28 | ||
| CN 201010224738 CN101895164A (en) | 2009-07-28 | 2010-07-13 | Copper-base alloy rotor slot wedge for high-power turbonator and processing process thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103643080A (en) * | 2013-12-25 | 2014-03-19 | 海门市江滨永久铜管有限公司 | High-strength, high-ductility and high-conductivity copper-nickel-silicon alloy bar and production method thereof |
| CN104032245A (en) * | 2014-06-06 | 2014-09-10 | 中国科学院金属研究所 | A production technology of an ultrafine-grained high-performance CuCrNiSi alloy slot wedge |
| CN104404294A (en) * | 2014-11-06 | 2015-03-11 | 上海电气电站设备有限公司 | Copper alloy rotor slot wedge with excellent high temperature performances and good extrusion moulding property and production method thereof |
| CN106011535A (en) * | 2016-07-19 | 2016-10-12 | 山东大学 | Rare earth oxide modified copper-nickel-silicon alloy material and preparation method and application thereof |
| CN106180617A (en) * | 2016-08-11 | 2016-12-07 | 泰兴市圣达铜业有限公司 | A kind of continuous extrausion process produces the processing technique of silver-bearing copper damping slot wedge |
| CN107326215A (en) * | 2017-08-15 | 2017-11-07 | 徐高杰 | A kind of processing method of slot wedge copper alloy |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB952545A (en) * | 1961-04-20 | 1964-03-18 | Westinghouse Electric Corp | Improved copper base alloys |
| JPS5655541A (en) * | 1979-10-12 | 1981-05-16 | Furukawa Kinzoku Kogyo Kk | Rotor wedge of rotary electric machiner |
| CN101078070A (en) * | 2006-05-25 | 2007-11-28 | 上海汽轮发电机有限公司 | Generator rotor slot wedge manufactured by beryllium-nickel-titanium-copper alloy |
-
2010
- 2010-07-13 CN CN 201010224738 patent/CN101895164A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB952545A (en) * | 1961-04-20 | 1964-03-18 | Westinghouse Electric Corp | Improved copper base alloys |
| JPS5655541A (en) * | 1979-10-12 | 1981-05-16 | Furukawa Kinzoku Kogyo Kk | Rotor wedge of rotary electric machiner |
| CN101078070A (en) * | 2006-05-25 | 2007-11-28 | 上海汽轮发电机有限公司 | Generator rotor slot wedge manufactured by beryllium-nickel-titanium-copper alloy |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103643080A (en) * | 2013-12-25 | 2014-03-19 | 海门市江滨永久铜管有限公司 | High-strength, high-ductility and high-conductivity copper-nickel-silicon alloy bar and production method thereof |
| CN104032245A (en) * | 2014-06-06 | 2014-09-10 | 中国科学院金属研究所 | A production technology of an ultrafine-grained high-performance CuCrNiSi alloy slot wedge |
| CN104404294A (en) * | 2014-11-06 | 2015-03-11 | 上海电气电站设备有限公司 | Copper alloy rotor slot wedge with excellent high temperature performances and good extrusion moulding property and production method thereof |
| CN106011535A (en) * | 2016-07-19 | 2016-10-12 | 山东大学 | Rare earth oxide modified copper-nickel-silicon alloy material and preparation method and application thereof |
| CN106180617A (en) * | 2016-08-11 | 2016-12-07 | 泰兴市圣达铜业有限公司 | A kind of continuous extrausion process produces the processing technique of silver-bearing copper damping slot wedge |
| CN107326215A (en) * | 2017-08-15 | 2017-11-07 | 徐高杰 | A kind of processing method of slot wedge copper alloy |
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Application publication date: 20101124 |