CN102505106A - Surface treatment process for wind power generation spindle bearing - Google Patents
Surface treatment process for wind power generation spindle bearing Download PDFInfo
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- CN102505106A CN102505106A CN201110453350XA CN201110453350A CN102505106A CN 102505106 A CN102505106 A CN 102505106A CN 201110453350X A CN201110453350X A CN 201110453350XA CN 201110453350 A CN201110453350 A CN 201110453350A CN 102505106 A CN102505106 A CN 102505106A
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Abstract
The invention discloses a surface treatment process for a wind power generation spindle bearing, and relates to the technical field of surface treatment of bearings. The process comprises the following steps of: controlling the vacuum degree in a furnace in the sulfurizing process, wherein the sulfurizing temperature of a low-temperature ion sulfurizing process is 120 DEG C; monitoring the vacuum degree and the glow distribution condition in the furnace at any time during temperature rise and heat preservation; placing sulfur tanks filled with sulfur powder at a negative plate, and auxiliary cathodes are arranged around the sulfur tanks; placing furnace samples at different positions of the negative plate after a workpiece is arranged; slowly raising the temperature, and gradually increasing the voltage along with scattered arc cleaning; beginning to raise the temperature after the scattered arc cleaning is finished; naturally cooling the workpiece to room temperature in a vacuum state in the furnace after the heat preservation is finished; and opening the vacuum furnace after the atmosphere in the furnace becomes normal pressure, taking the samples out, and spreading oil immediately. According to the invention, a low-temperature vacuum plasma sulfurizing process is applied to the wind power generation spindle bearing for the first time, so that the service life of the wind power generation spindle bearing is ensured; and the low-temperature vacuum plasma sulfurizing process has the characteristics of high efficiency and high quality, is easy to control and is pollution-free.
Description
Technical fieldThe present invention relates to be applied to the bearing surface processing technology field.Specifically relate to be applied to the process of surface treatment of wind-power electricity generation main shaft bearing.
Background technologyWind-power electricity generation main shaft bearing environment for use is abominable, must satisfy the requirement in 20 year work-ing life.Before not using the present invention, the wind-power electricity generation main shaft bearing in use, the surface produces phenomenons such as wearing and tearing, burn, surface come off, and causes the bearing early fatigue, can't guarantee the work-ing life of wind-power electricity generation bearing.Therefore wind power bearing requires surface modification treatment is carried out on its surface, to reach harsh requirements such as high-performance, high life, wear-resisting, low temperature resistant, self-lubricating.
Summary of the inventionIn order to solve the defective that prior art exists; The present invention with cryogenic vacuum plasma sulpurizing technology first Application in the wind-power electricity generation main shaft bearing; Sulphide layer is ability oil storage and the frictional coefficient that significantly reduces the wind-power electricity generation main shaft bearing under the load effect; Have anti-attrition and wear-resistant effect, can improve 10 times of bearing work-ing lifes.
In order to solve the problems of the technologies described above; Technical solution of the present invention is: cryogenic vacuum plasma sulpurizing technology is applied to the wind-power electricity generation main shaft bearing; Sulphide layer is ability oil storage and the frictional coefficient that significantly reduces the wind-power electricity generation main shaft bearing under the load effect; Have anti-attrition and wear-resistant effect, improved bearing work-ing life.
Technological innovation part of the present invention is:
1. first the low-temperature plasma sulfurizing technology is applied to the wind-power electricity generation main shaft bearing.
The present invention adopts the processing of low-temperature plasma vulcanizing oven.Technology is seen shown in Fig. 1.In the sulfurizing process, lasso and roller (non-suit) are placed in the airtight process furnace, and lasso adopts pile mode of pendulum.Heating, insulation and cooling period all guarantee to be in the stove vacuum state.
Principle: at glow discharge zone, utilize high voltage direct current to make sulfurous gas ionization, the sulfonium ion bombardment workpiece surface of generation makes piece surface form thick FeS (or the FeS in 3～5 μ m left and right sides
2With FeS) film, play to prevent the directly effect of contact of intermetallic at surfaces of metallic rubbing pairs, especially infiltration layer has a large amount of micropores, can oil storage and significantly reduce frictional coefficient.
2. traditional sulfurizing technology temperature is generally more than 200 ℃.And the wind-power electricity generation main shaft bearing requires to have the hardness of 60-63HRC, to guarantee wear resistance.Therefore requiring the tempering temperature of wind-power electricity generation main shaft bearing is 170 ℃, if adopt traditional sulfurizing technology, with the hardness that reduces bearing, changes the quenching structure form, can't reach customer requirements.And the sulfurizing temperature of low temperature ion sulfuration technology is 120 ℃, and sulfurizing temperature is lower than tempering temperature, has guaranteed that the hardness of bearing is constant, and the quenching structure rank is constant.This also be low-temperature plasma sulfurizing technology can be on the wind-power electricity generation main shaft bearing key in application.Table 1 is seen in hardness tissue contrast before and after its low-temperature plasma sulfurizing:
Table 1, low-temperature ion sulfidised surfaces are handled front and back bearings hardness, quenching structure contrast
3. low-temperature plasma sulfurizing technology, because sulfurizing temperature is low, the size of bearing does not change.This point is extremely important.Because the sulfurizing operation is the finishing operation at the bearing correct grinding, just carry out the trap assembling after the sulfurizing, therefore must guarantee size stability.Table 2 is seen in size, oval contrast before and after its low-temperature plasma sulfurizing:
Table 2, low-temperature ion sulfidised surfaces are handled front and back bearings size, oval contrast
4. handle the rear bearing roughness through the low-temperature ion sulfidised surfaces and improve, class of precision is higher, reduces frictional coefficient, improves bearing work-ing life.Table 3 is seen in the roughness contrast before and after its low-temperature plasma sulfurizing:
Table 3, low-temperature ion sulfidised surfaces are handled front and back bearings roughness contrast (inner ring)
5. low-temperature ion sulfidizing rear bearing is seen table 4 with the bearing fatigue life simultaneous test that is untreated:
Table 4, low-temperature ion sulfidised surfaces are handled the bearing and the bearing fatigue life contrast of being untreated
Bearing each item index of aging after the low-temperature ion sulfidised surfaces is handled all will be better than the bearing that is untreated far away, and the bearing fatigue life test value after the low-temperature ion sulfidised surfaces is handled is about 10 times of the bearing that is untreated.
After low-temperature plasma sulfurizing technology was applied to the wind-power electricity generation main shaft bearing, sulphide layer can oil storage and the frictional coefficient that significantly reduces the wind-power electricity generation main shaft bearing under the load effect, to improve bearing work-ing life.The wind-power electricity generation main shaft bearing is carried out the sulfurizing processing carry out comparative trial of life-span with the bearing that does not carry out the sulfurizing processing, draw through contrast: the bearing each item index of aging that carries out the sulfurizing processing all will be better than the bearing that is untreated, particularly V, L far away
10t, L
50tThree, carrying out sulfurizing, to handle the trial value of bearing be about 10 times of bearing of being untreated.
The beneficial effect that the present invention has is:
1. first with cryogenic vacuum plasma sulpurizing process application in the wind-power electricity generation main shaft bearing; Realized the sulfurizing technology process that workpiece is stable at low temperatures; Guaranteed the wind-power electricity generation main shaft bearing; Under the situation of the metallographic structure that does not change part and hardness, the surfaceness that does not change part and precision, improve the work-ing life of wind-power electricity generation main shaft bearing.
2. through traditional cryogenic vacuum plasma sulpurizing technology is improved; With this process application in the wind-power electricity generation main shaft bearing; Realized the sulfurizing technology process that workpiece is stable at low temperatures; Guarantee the wind-power electricity generation main shaft bearing, under the situation of the metallographic structure that does not change part and hardness, the surfaceness that does not change part and precision, improved the work-ing life of wind-power electricity generation main shaft bearing.
3. the wind-power electricity generation main shaft bearing has good bite-resistant ability after sulfurizing is handled, and under localized hyperthermia's effect that interlock takes place to be caused, sulphur can continue to play the effect of solid lubricant to the matrix diffusion.
4. the cryogenic vacuum plasma sulpurizing treatment process of wind-power electricity generation main shaft bearing have efficient height, quality good, easy to control, do not have any discharging, free of contamination characteristics.
Description of drawings
Fig. 1 is the low-temperature ion sulfuration process.
Embodiment
The specific embodiment of the invention is: the present invention adopts the processing of low-temperature plasma vulcanizing oven, and technology is seen shown in Fig. 1: in the sulfurizing process, the sulfurizing temperature of low temperature ion sulfuration technology is 120 ℃.
In the sulfurizing process in the stove vacuum tightness must reach 20Pa～50Pa, heat up with insulating process in, the operator monitors vacuum tightness and aura distribution situation in the stove at any time, when vacuum tightness surpasses 50Pa, then timely open vacuum pump vacuumizes.
Shove charge weight is less than 1500Kg.
During shove charge workpiece is put evenly, distance is not less than 50mm between the workpiece, and workpiece is put and highly do not allowed to surpass 600mm, workpiece apart from the negative plate edge distance greater than 50mm.
Processing lasso or roller need be put evenly, and put highly and be consistent.
The sulfurizing bearing of handling with stove of treating should be the inner ring or the outer ring of same model, and inner and outer ring does not allow suit, can put roller in the middle of the big lasso, but will guarantee roller and lasso distance greater than 100mm, and roller is put highly consistent with lasso.
Two sulphur jars of filling the sulphur powder are placed on forward and backward each 1/3rd place of negative plate, and 4 auxiliary cathodes are evenly placed at the 100mm place around the sulphur jar, and are less like processing parts, should suitably adjust the quantity that sulphur jar position also suitably increases auxiliary cathode.
Workpiece installs the back and places with stove sample (following the stove sample more than two) at the negative plate different positions, can adopt simulation sample or small roller.
The arc discharge that the initial stage allows certain amplitude that heats up takes place, and heats up this moment and wants slow, and the carrying out of cleaning along with the arc that looses can increase voltage gradually, but this stage voltage value do not allow to surpass 500V, and vacuum tightness remains between 20Pa～50Pa.
The arc of waiting to loose begins to heat up after cleaning basic the end, heats up through adjustment voltage and conduction ratio, and in temperature-rise period, magnitude of voltage must not surpass 500V, and conduction ratio must not surpass 0.5.
Sulfurizing temperature is controlled at 130 ℃ ± 10 ℃, and soaking time is 60min ± 5min.
After insulation finishes, powered-down, workpiece naturally cools to room temperature with stove under vacuum state, and the part tapping temperature is not more than 60 ℃.
Work-piece cools is opened the fire door handle after room temperature, open intake valve, the stove internal gas pressure is in open vacuum oven behind the normal pressure to take out sample, must wear clean gloves during sampling, does not allow directly to touch part with hand, take out part after oiling at once carry out corrosion protection.
Principle: at glow discharge zone, make sulfurous gas ionization with high voltage direct current, the sulfonium ion bombardment workpiece surface of generation makes piece surface form thick FeS (or the FeS in 3～5 μ m left and right sides
2With FeS) film, infiltration layer has a large amount of micropores, can oil storage.
Cryogenic vacuum plasma sulpurizing stove sulfurizing technology rules:
1 equipment and technology parameter
1.1 sulfurized furnace main technical details
1.1.1 sulfurizing vacuum oven vacuum-chamber dimensions is: Φ 1400mm * 3500mm
1.1.2 sulfurized furnace inner cathode board size is: 2900mm * 1000mm * 25mm
1.1.3 the top temperature that allows in the stove: 350 ℃
1.1.4 the workpiece maximum payload is: 1500Kg
1.2 pulse power main technical details
1.2.1 mains: the three-phase main-frequency alternating-current (380V, 50Hz)
1.2.2 power input: 81Kw; Output rating: 75Kw
1.2.3 output voltage: 0V～1000V is adjustable
1.2.4 dutycycle: 0.2～0.9 is adjustable continuously
1.2.5 arc extinguishing speed:＜20 μ s
2
Technical requirements before the sulfurizing
2.1 the geometrical shape of bearing pts, size and surfaceness should meet technical qualification.
2.2 the sulfurizing bearing pts has been as having divided group, the operator must divide into groups respectively to clean and places according to group before the sulfurizing.
2.3 during sulfurizing, the sulfurized furnace inwall must keep high degree of cleaning, should regularly in time clear up the sedimentary sulphur of inwall.
2.4 clean dry in the maintenance sulfurized furnace, when body of heater was not worked, the pressure of Vakuumkammer was not less than 1000Pa, and blowing out surpasses 3 days, must carry out sky stove baker before processing again.
3
Clean
3.1 must thoroughly clean up before the bearing pts sulfurizing; In the cleaning process; Operator must wear grease proofing gloves, with fine, soft fur brush or towel the greasy dirt at workpiece surface, groove and hole place and remaining smear metal are cleaned up, and stow away from heat with have the place of measures for the prevention of fire to carry out.The strictness of part to be cleaned and seriously to be beaten the arc phenomenon in order reducing in the sulfurizing process, thereby avoids workpiece to be burnt.
3.2 cleaning back part must reach oil duct, chamfering etc. and locate thorough cleaning, and guarantees stokehold workpiece complete drying, drying means can adopt the mode of seasoning or oven dry.
Atmosphere Control in the 4 sulfurizing processes
In the sulfurizing process in the stove vacuum tightness must reach 20Pa～50Pa, heat up with insulating process in, the operator monitors vacuum tightness and aura distribution situation in the stove at any time, when vacuum tightness surpasses 50Pa, then timely open vacuum pump vacuumizes.
5 workpiece shove charges regulation
5.1 shove charge weight is less than 1500Kg.
5.2 during shove charge workpiece is put evenly; Distance is not less than 50mm between the workpiece; Workpiece is put and is not highly allowed to surpass 600mm; Distance, needs to consider frock, modes of emplacement, whether shield, whether add auxiliary cathode for the complex configuration workpiece that aperture, groove, thin-walled are arranged greater than 50mm workpiece apart from the negative plate edge.
5.3 processing lasso or roller need be put evenly, and put highly and be consistent.
5.4 the sulfurizing bearing of handling with stove of treating should be the inner ring or the outer ring of same model, inner and outer ring does not allow suit, can put roller in the middle of the big lasso, but will guarantee roller and lasso distance greater than 100mm, and roller is put highly consistent with lasso.
5.5 the sulphur jar is placed: two sulphur jars of filling the sulphur powder are placed on forward and backward each 1/3rd place of negative plate; 4 auxiliary cathodes are evenly placed at the 100mm place around the sulphur jar; Less like processing parts, should suitably adjust sulphur jar position and the suitable quantity that increases auxiliary cathode.
5.6 workpiece installs the back and places with stove sample (following the stove sample more than two) at the negative plate different positions, can adopt simulation sample or small roller.
6 heating schedules
Arc cleans 6.1 loose: the arc discharge that the initial stage of heating up allows certain amplitude takes place; Heat up this moment and want slow; The carrying out of cleaning along with the arc that looses can increase voltage gradually, but this stage voltage value do not allow to surpass 500V, and vacuum tightness remains between 20Pa ~ 50Pa.
6.2 temperature-rise period: the arc of waiting to loose begins to heat up after cleaning basic the end, heats up through adjustment voltage and conduction ratio, and in temperature-rise period, magnitude of voltage must not surpass 500V, and conduction ratio must not surpass 0.5.
6.3 insulation: sulfurizing temperature is controlled at 130 ℃ ± 10 ℃, and soaking time is 60min ± 5min.
7
The cooling regulation
After insulation finishes, powered-down, workpiece naturally cools to room temperature with stove under vacuum state, and the part tapping temperature is not more than 60 ℃.
8 come out of the stove and antirust
Work-piece cools is opened the fire door handle after room temperature, open intake valve, the stove internal gas pressure is in open vacuum oven behind the normal pressure to take out sample, must wear clean gloves during sampling, does not allow directly to touch part with hand, take out part after oiling at once carry out corrosion protection.
The technical requirements of 9 sulfurizings and inspection procedure specification
9.1 technical requirements after the sulfurizing
After the part sulfurizing, the surface do not have tangible electric arc burn with surface imperfection such as peel off, sulfurizing part surface should be Dark grey, matrix hardness and microstructure with treat that the sulfurizing part is identical, deflection and ovality should be controlled in the finished product acceptability limit.
9.2 part sulphide layer degree of depth requirement
9.2.1 every stove part must be placed with the stove sample, type product of the same race is processed in the line number of going forward side by side management continuously; Whenever carry out a quality examination at a distance from five stove products; In the process as unusual condition occurs,, detect at any time like phenomenons such as the sulphide layer surface color are inhomogeneous.Processing novel part first, first stove must detect.
9.2.2 after the part sulfurizing, its sulphide layer should keep evenly as far as possible, its alloying layer thickness is qualified at 3～25 μ m.
9.2.3 the method that the detection of sulphide layer thickness adopts metallographic to combine with microhardness.
Tangible Iron sulfuret layer black-tape can appear in metallographicinspection on the xsect of sulphide layer; During the microhardness inspection, record vickers hardness number, can make hardness curve, organize hardness before the hardness of its top layer Iron sulfuret black-tape is significantly less than sulfurizing along xsect.
Claims (9)
1. the process of surface treatment of wind-power electricity generation main shaft bearing is characterized in that: vacuum tightness in the control stove in the sulfurizing process, and the sulfurizing temperature of low temperature ion sulfuration technology is 120 ℃; Heat up with insulating process in, monitor vacuum tightness and aura distribution situation in the stove at any time, when vacuum tightness surpasses 50Pa, then timely open vacuum pump vacuumizes; Two sulphur jars of filling the sulphur powder are placed on forward and backward each 1/3rd place of negative plate, and 4 auxiliary cathodes are evenly placed at the 100mm place around the sulphur jar; Workpiece installs the back and places with stove sample (following the stove sample more than two) at the negative plate different positions, can adopt simulation sample or small roller; The arc discharge that the intensification initial stage allows certain amplitude takes place, and heats up this moment to want slowly, and the carrying out of cleaning along with the arc that looses can increase voltage gradually, control magnitude of voltage, control vacuum tightness; The arc of waiting to loose begins to heat up after cleaning basic the end, heats up through adjustment voltage and conduction ratio; After insulation finishes, powered-down, workpiece naturally cools to room temperature with stove under vacuum state; Work-piece cools is opened the fire door handle after room temperature, open intake valve, the stove internal gas pressure is in open vacuum oven behind the normal pressure to take out sample, must wear clean gloves during sampling, does not allow directly to touch part with hand, takes out oiling at once behind the part.
2. the process of surface treatment of wind-power electricity generation main shaft bearing according to claim 1 is characterized in that: shove charge weight is less than 1500Kg.
3. the process of surface treatment of wind-power electricity generation main shaft bearing according to claim 1; It is characterized in that: during shove charge workpiece is put evenly; Distance is not less than 50mm between the workpiece, and workpiece is put and highly do not allowed to surpass 600mm, workpiece apart from the negative plate edge distance greater than 50mm.
4. the process of surface treatment of wind-power electricity generation main shaft bearing according to claim 1 is characterized in that: processing lasso or roller, and need put evenly, and put highly and be consistent; The sulfurizing bearing of handling with stove of treating should be the inner ring or the outer ring of same model, and inner and outer ring does not allow suit, can put roller in the middle of the big lasso, but will guarantee roller and lasso distance greater than 100mm, and roller is put highly consistent with lasso.
5. the process of surface treatment of wind-power electricity generation main shaft bearing according to claim 1 is characterized in that:, if processing parts is less, should suitably adjust sulphur jar position and the suitable quantity that increases auxiliary cathode.
6. the process of surface treatment of wind-power electricity generation main shaft bearing according to claim 1 is characterized in that: sulfurizing temperature is controlled at 130 ℃ ± 10 ℃, and soaking time is 60min ± 5min.
7. the process of surface treatment of wind-power electricity generation main shaft bearing according to claim 1 is characterized in that: the part tapping temperature is not more than 60 ℃.
8. the process of surface treatment of wind-power electricity generation main shaft bearing according to claim 1 is characterized in that: vacuum tightness need be controlled between 20Pa～50Pa.
9. the process of surface treatment of wind-power electricity generation main shaft bearing according to claim 1 is characterized in that: in temperature-rise period, magnitude of voltage must not surpass 500V, and conduction ratio must not surpass 0.5.
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| CN201110453350XA CN102505106A (en) | 2011-12-30 | 2011-12-30 | Surface treatment process for wind power generation spindle bearing |
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| CN201110453350XA CN102505106A (en) | 2011-12-30 | 2011-12-30 | Surface treatment process for wind power generation spindle bearing |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107236953A (en) * | 2017-04-18 | 2017-10-10 | 安徽华辉塑业科技股份有限公司 | A kind of perambulator support rib rod member surface anti-rust treatment method |
| CN115076230A (en) * | 2022-07-27 | 2022-09-20 | 山东天瑞重工有限公司 | Auxiliary supporting structure for magnetic suspension motor and manufacturing method of auxiliary bearing |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85106828A (en) * | 1985-09-10 | 1987-03-11 | 张弋飞 | The metal parts surface forms the method and apparatus of sulfurized layer |
| CN1434148A (en) * | 2002-01-21 | 2003-08-06 | 北京金东方科技发展有限公司 | Vacuum plasma sulpurizing method |
| CN1528943A (en) * | 2003-09-30 | 2004-09-15 | 刘宝琦 | Low-temperature vacuum plasma sulfurizing process |
| CN101914747A (en) * | 2010-08-17 | 2010-12-15 | 宋中林 | Cryogenic liquid sulfurizing method on surface of rolling bearing |
| CN101956155A (en) * | 2010-09-30 | 2011-01-26 | 北京天马轴承有限公司 | Gas plasma sulfurizing process |
-
2011
- 2011-12-30 CN CN201110453350XA patent/CN102505106A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85106828A (en) * | 1985-09-10 | 1987-03-11 | 张弋飞 | The metal parts surface forms the method and apparatus of sulfurized layer |
| CN1434148A (en) * | 2002-01-21 | 2003-08-06 | 北京金东方科技发展有限公司 | Vacuum plasma sulpurizing method |
| CN1528943A (en) * | 2003-09-30 | 2004-09-15 | 刘宝琦 | Low-temperature vacuum plasma sulfurizing process |
| CN101914747A (en) * | 2010-08-17 | 2010-12-15 | 宋中林 | Cryogenic liquid sulfurizing method on surface of rolling bearing |
| CN101956155A (en) * | 2010-09-30 | 2011-01-26 | 北京天马轴承有限公司 | Gas plasma sulfurizing process |
Non-Patent Citations (1)
| Title |
|---|
| 张敬一等: "LL-1A型辉光离子渗硫炉", 《金属热处理》, no. 7, 31 December 1990 (1990-12-31), pages 44 - 47 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107236953A (en) * | 2017-04-18 | 2017-10-10 | 安徽华辉塑业科技股份有限公司 | A kind of perambulator support rib rod member surface anti-rust treatment method |
| CN115076230A (en) * | 2022-07-27 | 2022-09-20 | 山东天瑞重工有限公司 | Auxiliary supporting structure for magnetic suspension motor and manufacturing method of auxiliary bearing |
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Application publication date: 20120620 |