CN101274362A - Method for casting shaft bushing and bearing alloy of high power turbine generator - Google Patents
Method for casting shaft bushing and bearing alloy of high power turbine generator Download PDFInfo
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- CN101274362A CN101274362A CNA2007100385697A CN200710038569A CN101274362A CN 101274362 A CN101274362 A CN 101274362A CN A2007100385697 A CNA2007100385697 A CN A2007100385697A CN 200710038569 A CN200710038569 A CN 200710038569A CN 101274362 A CN101274362 A CN 101274362A
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- bush
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Abstract
The invention discloses a casting method of the bearing alloy of the bearing bush of a high power turbogenerator. The bearing bush comprises a steel casting bush body and the bearing alloy that is connected on the internal bush face of the bush body in a casting way. The brand of the alloy is PDS47118-005. The casting method of the bearing alloy comprises the steps as follows: 1. the acid and alkali treatment of the bush body; 2. the coating of a soldering flux on the internal bush face of the bush body; 3. the preheating of the bush body and end plates; 4. the dipping of the bush body into a melted tin liquor after being taken out of a preheating furnace and the taking out of the brush body from the tin liquor after the temperature of the bush body reaches 290 DEG C to 300 DEG C; 5. the assembly of the bush body and the end plates; 6. the pouring of the bearing alloy by an upper centrifuge in the assembled bush body and end plates; 7. the cooling of the bearing bush: the poured bearing bush is put into a drying chamber at 160 DEG C for being cooled with the furnace and taken out of the furnace after being cooled to 60 DEG C. The casting method of the bearing alloy eliminates the shelling phenomenon between the bearing alloy and the steel casting bush body and improves the bearing capability of bearings.
Description
Technical field
The present invention relates to a kind of pouring procedure of shaft bushing and bearing alloy of high power turbine generator.
Technical background
It is the ZChSn11-6 babbit that the sliding bearing of steam turbine generator often adopts the trade mark, and the effect of bearing is to utilize the high pressure oil film wedge to hold up rotor and makes it high speed rotating.Babbit is because its cast temperature is lower, and processing technology is fairly simple, and the surface property of alloy is good, so become one of main bush material in ground of steam turbine generator in very long one period.But along with the direction to high speed, heavy duty of steam turbine generator develops, from the 120MW steam turbine generator to the 950MW steam turbine generator, when babbit uses as bush material, it is lower obviously to expose bearing capacity, the fatigue strength deficiency, and along with the rising of operating temperature, mechanical property is sharply descended the degradation weakness, so its use is subjected to certain restriction.Relevant for this reason scientific research personnel has developed the bearing metal that a kind of trade mark is PDS47118-005, and the chemical composition of this alloy sees the following form:
| Sn | ?Cu | ?Sb | ?Pb | ?Zn | ?Al | ?Ni | ?Fe | ?Bi | ?As | ?Ag | ?Cd |
| 81.3 | ?5.5～6.5 | ?11～13 | ?＜0.06 | ?0.5～0.7 | ?＜0.01 | ?＜0.06 | ?＜0.03 | ?＜0.06 | ?＜0.06 | ?0.05～0.15 | ?＜0.03 |
From the kamash alloy phasor detect and with the trade mark be that the alloy of ZChSn11-6 is done relatively mobile, under the identical situation of experimental condition, the flowability of PDS47118-005 alloy is obviously poor than the ZChSn11-6 alloy, fusing point and hardness number are also than ZChSn11-6 alloy height, and the casting character of these characteristics explanations PDS47118-005 alloy is poor.In the prior art, the insider has used for reference the pouring technology of the bearing metal (alloy designations is ZChSn11-6) of 300MW steam turbine generator, promptly adopt smelting temperature (400 ~ 420 ℃), the pouring temperature in bearing metal when cast of 300MW steam turbine generator, the rotating speed (320 ~ 350 rev/mins) and the type of cooling of centrifuge, tiling adopts flat in the bearing shell.But after the cast, it is serious to shell between bearing metal and the bearing shell body, and the alloy-layer material is loose, does not obviously reach quality requirement.Hence one can see that, and the adhesion of this crowd's alloy and watt body is less.Therefore, casting process how to develop the PDS47118-005 alloy becomes insider's problem demanding prompt solution.
Summary of the invention
The objective of the invention is to is to overcome the deficiencies in the prior art, a kind of pouring procedure of well behaved shaft bushing and bearing alloy of high power turbine generator is provided, and this method can be eliminated the shelling phenomenon between watt body of bearing metal and steel casting and make this bearing alloy layer material closely even.
The technical scheme that realizes above-mentioned purpose is: a kind of pouring procedure of shaft bushing and bearing alloy of high power turbine generator, described bearing shell comprises watt body of steel casting and is connected the bearing metal of tiling in watt body in the mode of cast, the trade mark of this alloy is PDS47118-005, the pouring procedure of described bearing metal, comprise the following steps: step 1, the soda acid of watt body is handled; Step 2, the interior tiling brushing scaling powder of watt body; Step 3, the preheating of watt body and end plate, wherein, the furnace temperature of preheating bearing shell is 120 ℃ ~ 150 ℃, and be 50 ~ 70 minutes preheating time, and the preheat temperature of end plate is 200 ℃; Step 4, watt body immerse in the tin liquor of melting after going out preheating furnace, take out when the temperature of watt body reaches 290 ℃ ~ 300 ℃; Step 5, the assembling of watt body and end plate, assembling should be rapidly to guarantee that watt body temperature degree after the assembling remains on 250 ℃ ~ 280 ℃; Step 6, last centrifuge is the make-up a bearing alloy in watt body of assembling and end plate, the smelting temperature of bearing metal is 440 ℃ ~ 450 ℃, rotating speed with centrifuge when building is controlled at 190 rev/mins ~ 210 rev/mins, pour after 2 ~ 3 minutes the rotating speed of centrifuge is brought up to 370 rev/mins ~ 400 rev/mins, after 2.5 ~ 3 minutes, logical again cooling water stops centrifuge after the temperature of watt body reaches 120 ℃ ~ 160 ℃ with this speed maintenance; Step 7, the cooling of bearing shell is put the bearing shell that pours in 160 ℃ the drying room and to be come out of the stove after being cooled to 60 ℃ with stove.
The pouring procedure of above-mentioned shaft bushing and bearing alloy of high power turbine generator wherein, before carrying out described step 1, also can be offered some dovetail grooves on the interior tiling of watt body, to increase the mechanical pulling force between bearing metal and watt body.
Owing to adopted the pouring procedure of shaft bushing and bearing alloy of high power turbine generator of the present invention, be that the bearing metal of PDS47118-005 has been formulated technological parameter of the present invention promptly at the trade mark, thereby eliminated the shelling phenomenon between watt body of bearing metal and steel casting, and make this bearing alloy layer material closely even, reached the quality standard of regulation, the bearing capacity, abrasive resistance and the anti-fatigue ability that have improved bearing develop with the direction to high speed, heavy duty that adapts to steam turbine generator.
The specific embodiment
The pouring procedure of a kind of shaft bushing and bearing alloy of high power turbine generator of the present invention, bearing shell comprises watt body of steel casting and is connected the bearing metal of tiling in watt body in the mode of cast, the trade mark of this alloy is PDS47118-005, and the pouring procedure of this bearing metal comprises the following steps:
Step 1, the soda acid of watt body is handled; The steel casting that is about to process watt body oil removing and removing oxide layer.
Step 2, the interior tiling brushing scaling powder of watt body;
Step 3, the preheating of watt body and end plate, wherein, the furnace temperature of preheating bearing shell is 120 ℃ ~ 150 ℃, and be 50 ~ 70 minutes preheating time, is preferably 60 minutes, and the preheat temperature of end plate is 200 ℃;
Step 4, watt body immerse in the tin liquor of melting after going out preheating furnace, take out when the temperature of watt body reaches 290 ℃ ~ 300 ℃; Be about to be preheating to 120 ℃ ~ 150 ℃ bearing shell immerse melt, temperature is in 300 ℃ the tin liquor, to take out when the temperature of watt body reaches 290 ℃ ~ 300 ℃.
Step 5, the assembling of watt body and end plate, assembling should be rapidly to guarantee that watt body temperature degree after the assembling remains on 250 ℃ ~ 280 ℃.
Step 6, last centrifuge is the make-up a bearing alloy in watt body of assembling and end plate, the smelting temperature of bearing metal is 440 ℃ ~ 450 ℃, rotating speed with centrifuge when building is controlled at 190 rev/mins ~ 210 rev/mins, pour after 2 ~ 3 minutes the rotating speed of centrifuge is brought up to 370 rev/mins ~ 400 rev/mins, after this speed kept 2.5 ~ 3 minutes, logical more a small amount of cooling water, after reaching 120 ℃ ~ 160 ℃, the temperature of watt body stops centrifuge, to guarantee slowly cooling and be unlikely to that solidification shrinkage is excessive to cause shelling of bearing metal.
Step 7, the cooling of bearing shell is put the bearing shell that pours in 160 ℃ the drying room and to be come out of the stove after being cooled to 60 ℃ with stove, causes shelling to reduce linear shrinkage to produce stress as far as possible.
Before the bearing shell cast, can on the interior tiling of watt body, offer some dovetail grooves in addition, to increase the mechanical pulling force between bearing metal and watt body.
Adopt the technological parameter of the pouring procedure of a kind of shaft bushing and bearing alloy of high power turbine generator of the present invention, by cast to the bearing metal (trade mark of alloy is PDS47118-005) of 390MW, 950MW turbine bearing pad, the bearing shell that pours meets quality standard substantially in ultrasonic examination and dye penetrant inspection test, eliminated the shelling phenomenon between watt body of bearing metal and steel casting, and made this bearing alloy layer material closely even.
Above embodiment is only for the usefulness that the present invention is described, but not limitation of the present invention, person skilled in the relevant technique, under the situation that does not break away from the spirit and scope of the present invention, can also make various conversion or modification, therefore all technical schemes that are equal to also should belong to category of the present invention, should be limited by each claim.
Claims (2)
1. the pouring procedure of a shaft bushing and bearing alloy of high power turbine generator, described bearing shell comprises watt body of steel casting and is connected the bearing metal of tiling in watt body in the mode of cast, the trade mark of this alloy is PDS47118-005, and the pouring procedure of described bearing metal comprises the following steps:
Step 1, the soda acid of watt body is handled;
Step 2, the interior tiling brushing scaling powder of watt body;
Step 3, the preheating of watt body and end plate, wherein, the furnace temperature of preheating bearing shell is 120 ℃ ~ 150 ℃, and be 50 ~ 70 minutes preheating time, and the preheat temperature of end plate is 200 ℃;
Step 4, watt body immerse in the tin liquor of melting after going out preheating furnace, take out when the temperature of watt body reaches 290 ℃ ~ 300 ℃;
Step 5, the assembling of watt body and end plate, assembling should be rapidly to guarantee that watt body temperature degree after the assembling remains on 250 ℃ ~ 280 ℃;
Step 6, last centrifuge is the make-up a bearing alloy in watt body of assembling and end plate, the smelting temperature of bearing metal is 440 ℃ ~ 450 ℃, rotating speed with centrifuge when building is controlled at 190 rev/mins ~ 210 rev/mins, pour after 2 ~ 3 minutes the rotating speed of centrifuge is brought up to 370 rev/mins ~ 400 rev/mins, after 2.5 ~ 3 minutes, logical again cooling water stops centrifuge after the temperature of watt body reaches 120 ℃ ~ 160 ℃ with this speed maintenance;
Step 7, the cooling of bearing shell is put the bearing shell that pours in 160 ℃ the drying room and to be come out of the stove after being cooled to 60 ℃ with stove.
2. the pouring procedure of shaft bushing and bearing alloy of high power turbine generator according to claim 1, it is characterized in that, before carrying out described step 1, also can on the interior tiling of watt body, offer some dovetail grooves, to increase the mechanical pulling force between bearing metal and watt body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100385697A CN101274362A (en) | 2007-03-28 | 2007-03-28 | Method for casting shaft bushing and bearing alloy of high power turbine generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100385697A CN101274362A (en) | 2007-03-28 | 2007-03-28 | Method for casting shaft bushing and bearing alloy of high power turbine generator |
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| Publication Number | Publication Date |
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| CN101274362A true CN101274362A (en) | 2008-10-01 |
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| CNA2007100385697A Pending CN101274362A (en) | 2007-03-28 | 2007-03-28 | Method for casting shaft bushing and bearing alloy of high power turbine generator |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021361A (en) * | 2010-11-24 | 2011-04-20 | 申发集团有限公司 | Novel Babbitt alloy material |
| CN102581248A (en) * | 2012-02-29 | 2012-07-18 | 重庆宗学重工机械股份有限公司 | Split type bearing bush centrifugal casting method |
| CN106825506A (en) * | 2015-12-04 | 2017-06-13 | 上海电气集团上海电机厂有限公司 | Karmarsch alloy casting method |
| CN109759566A (en) * | 2019-03-22 | 2019-05-17 | 上海电气集团上海电机厂有限公司 | A method of casting thrust bearing shoe valve bearing metal |
-
2007
- 2007-03-28 CN CNA2007100385697A patent/CN101274362A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102021361A (en) * | 2010-11-24 | 2011-04-20 | 申发集团有限公司 | Novel Babbitt alloy material |
| CN102581248A (en) * | 2012-02-29 | 2012-07-18 | 重庆宗学重工机械股份有限公司 | Split type bearing bush centrifugal casting method |
| CN102581248B (en) * | 2012-02-29 | 2014-12-31 | 重庆宗学重工机械股份有限公司 | Split type bearing bush centrifugal casting method |
| CN106825506A (en) * | 2015-12-04 | 2017-06-13 | 上海电气集团上海电机厂有限公司 | Karmarsch alloy casting method |
| CN109759566A (en) * | 2019-03-22 | 2019-05-17 | 上海电气集团上海电机厂有限公司 | A method of casting thrust bearing shoe valve bearing metal |
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Open date: 20081001 |