CN102766749B - Process for quenching ball track of slewing bearing - Google Patents
Process for quenching ball track of slewing bearing Download PDFInfo
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- CN102766749B CN102766749B CN201210243923.0A CN201210243923A CN102766749B CN 102766749 B CN102766749 B CN 102766749B CN 201210243923 A CN201210243923 A CN 201210243923A CN 102766749 B CN102766749 B CN 102766749B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention discloses a process for quenching a ball track of a slewing bearing. The process mainly comprises the following steps of: roughly turning blanks of an inner ring and an outer ring of the slewing bearing, performing semi-finish turning on the ball track, quenching, performing stress relief tempering, and grinding. An inductor in quenching equipment in quenching is a medium-frequency quenching inductor; a quenching liquid is a polyaleneglycol (PAG) quenching liquid; a supporting component of a workpiece in the quenching equipment comprises an upper supporting wheel and two lower supporting wheels; the two lower supporting wheels are driven by a reducing motor respectively; the medium-frequency quenching inductor is fixed on a fixing frame; a transformer which drives the medium-frequency quenching inductor to operate is also arranged on the fixing frame; and an inductive head of the front end of the medium-frequency quenching inductor is arc-shaped and is matched with the ball track which is opposite to the inductive head. By setting and adjustment of process parameters such as coupling clearance, depth of current penetration, linear velocity of ball tracks, and temperature and concentration of quenching liquids in the quenching process, the quenching quality is improved.
Description
Technical field
The invention belongs to rotating bearing processing and manufacturing field, relate in particular to the processing method that a kind of pivoting support raceway quenches.
Background technology
The development that the rotating bearing industry has experienced more than 30 years in China, JB2300-84 " rotating bearing form, basic parameter and the technical requirements " standard of issuing first from 1984, and JB/T2300-1999 " rotating bearing " standard of revising in 1999, existing China has possessed perfect rotating bearing design, the comprehensive exploitation ability of Computer-Assisted Design, Manufacture And Test.Simultaneously different industries has proposed the standard of oneself to the rotating bearing page, and as wind-power electricity generation, building machinery, bearing industry etc., product progresses into refinement, competition situation wide in variety as can be seen here.
At present, on market, the consumption maximum is the supporting of single four-point contact ball slewing, and the raceway diameter accounts for the overwhelming majority wherein between Φ 500～Φ 1500mm; Nowadays, along with the development, particularly wind-power electricity generation industry of engineering machinery, special purpose vehicle and industrial robot etc. are grown up at a high speed, quality, the novelty of product are had higher requirement.But high precision, the high-end rotating bearing market that the life-span is long, weathering resistance is strong are still controlled by external traditional enterprise, annual domestic a large amount of these type of rotating bearings of import that all need, domestic enterprise all faces the severe challenge of technological innovation.
The failure mode of rotating bearing has two kinds, the one, raceway damages, the 2nd, broken teeth, and the ratio that the raceway damage accounts for reaches more than 98%, therefore the raceway quality is the key problem of rotating bearing quality, affect the many factors of pivoting support raceway quality, material as raceway, geometrical dimension and roughness (working accuracy), the rotating linear velocity of raceway and beating, the shape of inductor block and the position of workpiece, Heating temperature, the selection of hardening liquid, control, pressure, but raceway quenching hardness wherein, depth of hardening zone, raceway radius-of-curvature and contact angle are undoubtedly most important four influence factors, they affect the raceway quality in a different manner, and supporting capacity and the work-ing life of rotating bearing have been determined, technological process and quenching quality that to sum up pivoting support raceway quenches are very important, existing quenching technology process is simple, fine cracks appears in its roller surface that easily causes quenching, the serious workpiece that causes is scrapped, in use procedure simultaneously, the PAG hardening liquid can run off with workpiece, oxygenolysis, and impurity, greasy dirt, tap water contains material etc. and adds, all formed the impact on concentration, the data that detect with refractometer will lack verity, thereby affect the raceway quality.
Summary of the invention
The processing method that invention provides a kind of pivoting support raceway to quench, by the intermediate frequency inductor in quenching process and the coupling gap between raceway, the depth of current penetration, Race Line speed, setting and the adjustment of the processing parameters such as the temperature of hardening liquid and concentration, improved the quenching quality, avoided the quenching roller surface fine cracks to occur, the serious workpiece that causes is scrapped, in use procedure simultaneously, the PAG hardening liquid can run off with workpiece, oxygenolysis, and impurity, greasy dirt, tap water contains material etc. and adds, all formed the impact on concentration, the data that detect with refractometer will lack verity, thereby affect the problems such as raceway quality.
Technical scheme of the present invention is as follows:
The processing method that a kind of pivoting support raceway quenches, its master operation is that blank is carried out respectively in the inner ring of rotating bearing and outer ring is rough turn, raceway half finish turning, quench, destressing tempering and grinding, it is characterized in that: the inductor block in the quenching apparatus in described quenching adopts the medium frequency quenching inductor block, hardening liquid is the PAG hardening liquid, in quenching apparatus, the support component of workpiece includes support roller on, two lower support wheels, described two lower support wheels are driven by reducing motor respectively, described medium frequency quenching inductor block is fixedly mounted on anchor, the transformer that drives the operation of medium frequency quenching inductor block also is installed on described anchor, the inductive head of described medium frequency quenching inductor block leading section is that the raceway that arc is corresponding with it matches, and the inductive head two ends raceway corresponding with it should leave the coupling space, described anchor bottom is provided with roller,
Its concrete technology step of utilizing above-mentioned quenching apparatus to quench is as follows:
(1), at first measure raceway diameter and the outside diameter for the treatment of quenching workpiece, height of center according to workpiece on quenching apparatus, calculate and adjust the width between centers between upper support roller and two bottom rollers, adjust the pop-up wheel location at workpiece top simultaneously, guarantee that workpiece centre is high consistent with the inductive head centre-height of medium frequency quenching inductor block;
(2), will treat that quenching workpiece is clean clean, must not the residual process residue and other dirt settling, greasy dirt, in lifting on quenching apparatus, lay appropriate after, with the rolling track and radial of centimeter check workpiece, beat, within beating and being controlled at 0.1mm;
(3), adjust the inductive head of medium frequency quenching inductor block and the raceway gap for the treatment of quenching workpiece, detect inductive head and the raceway gap of medium frequency quenching inductor block with clearance gauge, the raceway position spacing h1 that the curved end of control inductive head is corresponding with it and the raceway position spacing h2 size corresponding to two ends of inductive head, as: the raceway position spacing that the curved end of inductive head is corresponding with it is h=1～1.8mm, and the both sides of the inductive head raceway position spacing corresponding with it is h1=2～2.5mm;
(4), by thermometer, monitor the temperature of adjusting the PAG hardening liquid, by cooling tower, the PAG quench fluid temperature is controlled to 40 ± 10 ℃, by refractometer, coordinate viscometry, actual concentration assay method to detect PAG hardening liquid concentration, by the PAG hardening liquid, adding water that concentration is controlled to 9 ± 1%;
(5), adjust mid-frequency quenching equipment induction frequencies and voltage, electric current output parameter, wherein the operating frequency of intermediate frequency inductor depends on depth of hardening, the depth of current penetration of generally getting is 2 times of left and right of depth of hardening zone, the pivoting support raceway depth of hardening is 3～5mm, and the calculated rate scope is at 7～2.5KHz; Treat that the quenching workpiece speed of rotation is that upper support roller and two lower support wheels that driven by reducing motor have driven, its speed of rotation is adjustable, and concrete speed control should be selected with on-the-spot device parameter and the factors combine such as raceway sphere diameter is tested and could be confirmed;
(6), get the exemplar of same specification, tested the quenching of 20-30cm distance, check quenching hardness and appearance quality, carry out initial workpiece processing after qualified, initial workpiece detects rear and can be mass, and notes per tour process parameter record in batch production process, uses statistical analysis technique, control process processing parameter progressively, quench within latter 10 hours and must carry out temper, 190 ± 10 ℃ of tempering temperatures, be incubated 2 hours, air cooling, check again.
The roughness for the treatment of the quenching workpiece raceway in described raceway half finish turning is 3.2-1.6, raceway is middle as left oil groove simultaneously, the joint face of its oil groove both sides and raceway adopts rounding off, and while adopting the round and smooth Nature Link of joint face that radius is R2 between the radius R 3 of oil groove and raceway radius R, to consider the sharp angle effect of quenching when its R1, R2, R3 design, get as far as possible large size, general requirement is not less than 3mm.
Describedly treat that quenching workpiece raceway diameter is 500-1500mm, treat that the span of control of quenching workpiece Race Line speed is substantially between 180～220mm/min.
Principle of the present invention is: the most material of rolling ring is 50Mn or 42CrMo steel alloy, and being quenching and tempering hardness before material processing is 210-270HB, and blank is the modified condition of delivery of roller-compaction.It is not too strict that the half most of producers of finish turning require roughness, basic controlling is at roughness 12.5 states, sharp angle effect according to medium frequency quenching, if roughness is on the low side, fine cracks appears in the roller surface that easily causes quenching, the serious workpiece that causes is scrapped, and requires thus roughness preferably to be controlled at the 3.2-1.6 left and right.If secondly in the middle of raceway, leave oil groove, the radius R 3 of oil groove is connected round and smooth nature with raceway radius R face as far as possible, therefore R1, R2, R3 will consider the sharp angle effect of quenching while designing, get as far as possible large size, general requirement is not less than 3mm, and require to want deburring and workpiece surface dirt settling after raceway half finish turning holding workpiece clean.
The shape of intermediate frequency inductor inductive head and position.The inductor block heating is to utilize the electrical equipment principle of induction, and producing induced current on workpiece surface is eddy current, is treating under the effect of quenching workpiece self-resistance, the electric energy energy transform into heat energy, for accurately expressing the profile arc size of inductor block, during making, want fully on the basis of understanding the groove-section geometrical dimension, to carry out copying, to guarantee hot face, be heated evenly, consider sharp angle effect, larger coupling space should be designed in two ends, the inductor block outside, when principle is quenched, and h=1～1.8mm, h1=2～2.5mm
The operating frequency of inductor block depends on depth of hardening, and the depth of current penetration of generally getting is 2 times of depth of hardening zone, and the pivoting support raceway depth of hardening is 3～5mm, and the calculated rate scope is at 7～2.5KHz,
The linear velocity of the raceway motion of hot temperature and workpiece.The characteristics of heating in medium frequency are that rate of heating is fast, the metallographic structure of metallic substance changes also fast, and the austenite crystal of gained is also thinner, thus also high 2～3HRC of the hardness that the hardness ratio common heating obtained is quenched, martensite is tiny, and wear resistance and fatigue strength also improve greatly.Due to the material of rolling ring, by modified or normalizing, material structure crystal grain is thinner, and general selective quenching temperature is selected 920 ± 20 ℃ substantially.
The speed of rotation for the treatment of quenching workpiece has been driven by two support rollers of reducing motor drive, speed of rotation is adjustable, facilitate like this control of raceway rotational line speed of the workpiece of different diameter, during quenching, the linear velocity of workpiece will directly affect the time that raceway is heated, induction heating temperature to raceway just plays a decisive role, and then affect the degree of depth of quenched case, concrete speed control should be selected with on-the-spot device parameter and the factors combine such as raceway sphere diameter is tested and could be confirmed, the span of control of most of Race Line speed is substantially between 180～220mm/min.
The control of hardening liquid.Hardening liquid has basic impact on hardness and the quenching defect of quenching as crackle, distortion, hardness not enough (hickie), the PAG that most producer is used, this is a kind of multipolymer by oxyethane and propylene oxide, when temperature raises, polyethers solubleness can descend on the contrary, and even from water, separates out (this is called contrary dissolubility).Polyether aqueous solution is homogeneous transparent solution at normal temperatures, and when temperature rises to cloud point, solution is just from the transparent muddiness that becomes.When temperature continues to rise to contrary fusing point, the linear macromolecule of polyethers will be separated out from water, and separates fully with water.When polyethers concentration increases, can form deposited film at workpiece surface in quenching process, play a part thermofin, speed of cooling is descended.The thickness of deposited film depends on polyethers concentration.Therefore the speed of cooling of polyethers solution can be regulated.The existence of deposited film makes heat radiation more even, thereby can eliminate soft spots, and reduces the internal stress of workpiece, prevents workpiece deformation.When quenching temperature drops to contrary fusing point when following, the polyethers of having separated out again can be again water-soluble.The process parameter control of PAG hardening liquid: 1, temperature: the temperature of hardening liquid need to have thermometer to be monitored, and its use temperature scope is narrower, is generally 40 ± 10 ℃, and supporting equipment needs to carry out temperature control (cooling or heating) and stirred simultaneously; 2, concentration is controlled: in use procedure PAG can run off with workpiece, oxygenolysis, and impurity, greasy dirt, tap water contain material etc. and add, all formed the impact on concentration, the data that detect with refractometer will lack verity, can coordinate viscosimetry, actual concentration method of masurement (sampling heating and separating) system to control the content of PAG component, general concentration is controlled at 9 ± 1%.Strengthen the cleaning before workpiece is processed simultaneously, increase the service life.
Beneficial effect of the present invention:
The present invention is by setting and the adjustment of the processing parameters such as the temperature to the coupling gap in quenching process, the depth of current penetration, Race Line speed, hardening liquid and concentration, improved the quenching quality, being particularly suitable for material is 50Mn or 42CrMo, the raceway quenching requirement of diameter in the 500-1500mm scope.
The accompanying drawing explanation
Fig. 1 is quenching apparatus and treats the quenching workpiece structural representation.
Fig. 2 is intermediate frequency inductor inductive head and raceway fit structure schematic diagram.
Fig. 3 is the roller path structure schematic diagram.
Fig. 4 is raceway quenching hardness layer schematic diagram.
Embodiment
Referring to accompanying drawing: the processing method that a kind of pivoting support raceway quenches, its master operation is that blank is carried out respectively in the inner ring of rotating bearing and outer ring is rough turn, raceway half finish turning, quench, destressing tempering and grinding, inductor block in quenching apparatus in quenching adopts the medium frequency quenching inductor block, hardening liquid is the PAG hardening liquid, in quenching apparatus, the support component of workpiece 1 includes support roller 6 on, two lower support wheels 4, 5, two lower support wheels 4, 5 are driven by reducing motor 3 respectively, medium frequency quenching inductor block 2 is fixedly mounted on anchor 7, the transformer that drives 2 operations of medium frequency quenching inductor block also is installed on anchor 7, the inductive head 8 of medium frequency quenching inductor block 2 leading sections matches for the arc raceway 9 corresponding with it, and the inductive head 8 two ends raceway 9 corresponding with it should leave the coupling space, the anchor bottom is provided with roller,
Its concrete technology step of utilizing above-mentioned quenching apparatus to quench is as follows:
(1), at first measure raceway diameter and the outside diameter for the treatment of quenching workpiece, height of center according to workpiece on quenching apparatus, calculate and adjust the width between centers between upper support roller and two bottom rollers, adjust the pop-up wheel location at workpiece top simultaneously, guarantee that workpiece centre is high consistent with the inductive head centre-height of medium frequency quenching inductor block;
(2), will treat that quenching workpiece is clean clean, must not the residual process residue and other dirt settling, greasy dirt, in lifting on quenching apparatus, lay appropriate after, with the rolling track and radial of centimeter check workpiece, beat, within beating and being controlled at 0.1mm;
(3), adjust the inductive head of medium frequency quenching inductor block and the raceway gap for the treatment of quenching workpiece, detect inductive head and the raceway gap of medium frequency quenching inductor block with clearance gauge, the raceway position spacing h1 that the curved end of control inductive head is corresponding with it and the raceway position spacing h2 size corresponding to two ends of inductive head, as: the raceway position spacing that the curved end of inductive head is corresponding with it is h=1～1.8mm, and the both sides of the inductive head raceway position spacing corresponding with it is h1=2～2.5mm;
(4), by thermometer, monitor the temperature of adjusting the PAG hardening liquid, by cooling tower, the PAG quench fluid temperature is controlled to 40 ± 10 ℃, by refractometer, coordinate viscometry, actual concentration assay method to detect PAG hardening liquid concentration, by the PAG hardening liquid, adding water that concentration is controlled to 9 ± 1%;
(5), adjust mid-frequency quenching equipment induction frequencies and voltage, electric current output parameter, wherein the operating frequency of intermediate frequency inductor depends on depth of hardening, the depth of current penetration of generally getting is 2 times of left and right of depth of hardening zone, the pivoting support raceway depth of hardening is for being that groove-section quenching hardness layer 10 is 3～5mm, and the calculated rate scope is at 7～2.5KHz; Treat that the quenching workpiece speed of rotation is that upper support roller and two lower support wheels that driven by reducing motor have driven, its speed of rotation is adjustable, and concrete speed control should be selected with on-the-spot device parameter and the factors combine such as raceway sphere diameter is tested and could be confirmed;
(6), get the exemplar of same specification, tested the quenching of 20-30cm distance, check quenching hardness and appearance quality, carry out initial workpiece processing after qualified, initial workpiece detects rear and can be mass, and notes per tour process parameter record in batch production process, uses statistical analysis technique, control process processing parameter progressively, quench within latter 10 hours and must carry out temper, 190 ± 10 ℃ of tempering temperatures, be incubated 2 hours, air cooling, check again.
The roughness for the treatment of the quenching workpiece raceway in described raceway half finish turning is 3.2-1.6, raceway is middle as left oil groove simultaneously, the joint face of its oil groove both sides and raceway adopts rounding off, and while adopting the round and smooth Nature Link of joint face that radius is R2 between the radius R 3 of oil groove and raceway radius R, to consider the sharp angle effect of quenching when its R1, R2, R3 design, get as far as possible large size, general requirement is not less than 3mm.
Describedly treat that quenching workpiece raceway diameter is 500-1500mm, treat that the span of control of quenching workpiece Race Line speed is substantially between 180～220mm/min.
Claims (3)
1. the processing method that a pivoting support raceway quenches, its master operation is that blank is carried out respectively in the inner ring of rotating bearing and outer ring is rough turn, raceway half finish turning, quench, destressing tempering and grinding, it is characterized in that: the inductor block in the quenching apparatus in described quenching adopts the medium frequency quenching inductor block, hardening liquid is the PAG hardening liquid, in quenching apparatus, the support component of workpiece includes support roller on, two lower support wheels, described two lower support wheels are driven by reducing motor respectively, described medium frequency quenching inductor block is fixedly mounted on anchor, the transformer that drives the operation of medium frequency quenching inductor block also is installed on described anchor, the inductive head of described medium frequency quenching inductor block leading section is arc, the raceway that inductive head is corresponding with it matches, and the inductive head two ends raceway corresponding with it should leave the coupling space, described anchor bottom is provided with roller,
Its concrete technology step of utilizing above-mentioned quenching apparatus to quench is as follows:
(1), at first measure raceway diameter and the outside diameter for the treatment of quenching workpiece, height of center according to workpiece on quenching apparatus, calculate and adjust the width between centers between upper support roller and two bottom rollers, adjust the pop-up wheel location at workpiece top simultaneously, guarantee that workpiece centre is high consistent with the inductive head centre-height of medium frequency quenching inductor block;
(2), will treat that quenching workpiece is clean clean, must not residual process residue and other dirt settling, be lifted on quenching apparatus, lay appropriate after, with the rolling track and radial of centimeter check workpiece, beat, within beating and being controlled at 0.1mm;
(3), adjust the inductive head of medium frequency quenching inductor block and the raceway gap for the treatment of quenching workpiece, detect inductive head and the raceway gap of medium frequency quenching inductor block with clearance gauge, the raceway position spacing h1 that the curved end of control inductive head is corresponding with it and the raceway position spacing h2 size corresponding to two ends of inductive head, the raceway position spacing that the curved end of inductive head is corresponding with it is h1=1～1.8mm, and the both sides of the inductive head raceway position spacing corresponding with it is h2=2～2.5mm;
(4), by thermometer, monitor the temperature of adjusting the PAG hardening liquid, by cooling tower, the PAG quench fluid temperature is controlled to 40 ± 10 ℃, by refractometer, coordinate viscometry, actual concentration assay method to detect PAG hardening liquid concentration, by the PAG hardening liquid, adding water that concentration is controlled to 9 ± 1%;
(5), adjust medium frequency quenching inductor block induction frequencies and voltage, electric current output parameter, wherein the operating frequency of medium frequency quenching inductor block depends on depth of hardening, the depth of current penetration of getting is 2 times of depth of hardening zone, the pivoting support raceway depth of hardening is 3～5mm, and the calculated rate scope is at 7～2.5KHz; Treat that the quenching workpiece speed of rotation is that upper support roller and two lower support wheels that driven by reducing motor have driven, its speed of rotation is adjustable, and concrete speed control should select with on-the-spot device parameter and the factors combine test of raceway sphere diameter could be confirmed;
(6), get the exemplar of same specification, tested the quenching of 20-30cm distance, check quenching hardness and appearance quality, carry out initial workpiece processing after qualified, initial workpiece detects rear and can be mass, and notes per tour process parameter record in batch production process, uses statistical analysis technique, control process processing parameter progressively, quench within latter 10 hours and must carry out temper, 190 ± 10 ℃ of tempering temperatures, be incubated 2 hours, air cooling, check again.
2. the processing method that pivoting support raceway according to claim 1 quenches, is characterized in that: described
The roughness for the treatment of the quenching workpiece raceway in raceway half finish turning is 3.2-1.6, raceway is middle as left oil groove simultaneously, the joint face of its oil groove both sides and raceway adopts rounding off, and while adopting the round and smooth Nature Link of joint face that radius is R2 between the radius R 3 of oil groove and raceway radius R 1, to consider the sharp angle effect of quenching when its R1, R2, R3 design, get as far as possible large size, require to be not less than 3mm.
3. the processing method that pivoting support raceway according to claim 1 quenches is characterized in that: describedly treat that quenching workpiece raceway diameter is 500-1500mm, treat that the span of control of quenching workpiece Race Line speed is between 180～220mm/min.
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| CN103882207A (en) * | 2013-12-13 | 2014-06-25 | 柳州市柳港激光科技有限公司 | Medium-frequency quenching process of smoothing roll and quenching equipment thereof |
| CN104439951A (en) * | 2014-11-15 | 2015-03-25 | 江阴吉爱倍万达精工有限公司 | Machining technology of bearing rings with steps on outer rings |
| JP7336129B2 (en) * | 2019-05-16 | 2023-08-31 | 富士電子工業株式会社 | Induction hardening device and long workpiece support device |
| CN113751971A (en) * | 2021-09-23 | 2021-12-07 | 徐州万达回转支承有限公司 | Machining process of slewing bearing |
| CN114277228A (en) * | 2021-12-29 | 2022-04-05 | 远景能源有限公司 | Large self-aligning roller bearing and manufacturing method thereof |
| CN115181833A (en) * | 2022-07-20 | 2022-10-14 | 洛阳鹏丰轴承制造有限公司 | Quenching method for double-row four-point contact ball bearing ring double-raceway surface |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101629235A (en) * | 2009-08-17 | 2010-01-20 | 江阴嘉鑫风电轴承有限公司 | Quenching method of roller path of double-roller path variable pitch bearing |
| EP2186916A1 (en) * | 2008-11-17 | 2010-05-19 | LOI Thermprocess GmbH | Process and installation for continuous case hardening |
| CN202099344U (en) * | 2011-06-01 | 2012-01-04 | 洛阳新强联回转支承有限公司 | Sensor for simultaneous quenching of three rows of raceways of slewing bearing |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2186916A1 (en) * | 2008-11-17 | 2010-05-19 | LOI Thermprocess GmbH | Process and installation for continuous case hardening |
| CN101629235A (en) * | 2009-08-17 | 2010-01-20 | 江阴嘉鑫风电轴承有限公司 | Quenching method of roller path of double-roller path variable pitch bearing |
| CN202099344U (en) * | 2011-06-01 | 2012-01-04 | 洛阳新强联回转支承有限公司 | Sensor for simultaneous quenching of three rows of raceways of slewing bearing |
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Address after: 242000 Yingbin Avenue, Xuanzhou Industrial Park, Xuancheng, Anhui, 10 Patentee after: Anhui Qiankun Heavy Industry Machinery Co., Ltd Address before: 242000 Yingbin Avenue, Xuanzhou Industrial Park, Xuancheng, Anhui, 10 Patentee before: ANHUI XUANCHENG QIANKUN SLEWING RING Co.,Ltd. |