CN105088164B - A kind of bearing outer ring ball track strengthening and processing device and processing method - Google Patents
A kind of bearing outer ring ball track strengthening and processing device and processing method Download PDFInfo
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- CN105088164B CN105088164B CN201510493669.3A CN201510493669A CN105088164B CN 105088164 B CN105088164 B CN 105088164B CN 201510493669 A CN201510493669 A CN 201510493669A CN 105088164 B CN105088164 B CN 105088164B
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- bearing outer
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- bottom plate
- vacuum
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- 238000012545 processing Methods 0.000 title claims abstract description 34
- 238000005728 strengthening Methods 0.000 title claims abstract description 14
- 238000003672 processing method Methods 0.000 title abstract description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 18
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 12
- 239000010959 steel Substances 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 9
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 9
- 230000001133 acceleration Effects 0.000 claims abstract description 8
- 229910052786 argon Inorganic materials 0.000 claims abstract description 8
- 238000005086 pumping Methods 0.000 claims abstract description 8
- 230000008569 process Effects 0.000 claims abstract description 6
- 238000000427 thin-film deposition Methods 0.000 claims abstract description 5
- 238000002513 implantation Methods 0.000 claims abstract description 4
- 238000001816 cooling Methods 0.000 claims description 19
- 239000007789 gas Substances 0.000 claims description 13
- 239000002826 coolant Substances 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 239000003574 free electron Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000000977 initiatory effect Effects 0.000 claims description 3
- 230000001934 delay Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 2
- 150000002500 ions Chemical class 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 5
- 230000005684 electric field Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000007654 immersion Methods 0.000 description 2
- 238000005468 ion implantation Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
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- Plasma Technology (AREA)
Abstract
The invention discloses a kind of bearing outer ring ball track strengthening and processing device and processing method, including vacuum processing chamber, fine pumping system, high pressure target platform, plasma generator, ion acceleration component and air supply system.Also disclose the processing method of the device.Cooperation of the invention by vacuum processing chamber, fine pumping system, high pressure target platform, plasma generator, ion acceleration component and air supply system, form the ion implanting processing equipment of complete set.Radio-frequency power supply establishes radio frequency discharge nitrogen, carbon, argon plasma, and large power high voltage pulse power supply provides negative high voltage pulsed bias to processed steel ball, to implement ion implanting or thin film deposition process.Bearing outer ring is enclosed on grid electrode and central electrode so that the raceway of the outer outer ring of bearing obtains more uniform implantation dosage；Intensive treatment effect is more preferable.
Description
Technical field
The present invention relates to a kind of bearing outer ring ball track strengthening and processing device and processing method, belongs to the production of bearing intensive treatment
Equipment and its manufacturing field.
Background technology
China is that Production of bearing big country, bearing outlet quantity account for first place in the world, but domestic bearing be mostly in, low-grade axle
Hold, added value is relatively low, very low plus the disorderly competition between enterprise, profit margin；But military enterprise of China, Aeronautics and Astronautics
Long-life high end bearing, the special type for being badly in need of wanting etc. new and high technology and scientific research, atomic power station, bullet train etc. industry
Bearing needs import mostly.
Because domestic bearing steel metallurgical quality and external bearing steel gap are larger, and because domestic bearing is in design, system
Make, lubricate, assembling etc. and the gap of foreign countries, make domestic bearing compared with state's outer bearing, and its is wear-resistant, anticorrosive, anti-tired
Labor poor-performing, service life are relatively low.
The spallation problems of similar film are not present in plasma immersion ion injection technology, can accurately control injection from
Quantum count, its control method are the quantity and energy of detection injection electric charge, can keep specimen surface roughness, do not influence size essence
Degree.
Because ion implantation technology feature is applicable the surface modification treatment of bearing very much, it does not have to change the material of bearing, set
Meter and mechanical processing technique just can reach the purpose of bearing extension.
Plasma immersion ion injects（PIII）It is a kind of novel ion implantation technique, it eliminates beamline ion implanters note
Enter the intrinsic direct projection limitation of technology, equipment it is relatively low compared with simple, investment cost but can only small lot parts processed, cannot get
Develop rapidly.
The content of the invention
To overcome above-mentioned deficiency, it is an object of the present invention to provide a kind of simple in construction to strengthen to bearing outer ring ball track
The device and processing method of processing.
The solution of the present invention is as follows：A kind of bearing outer ring ball track strengthening and processing device, including vacuum processing chamber, high vacuum are taken out
Gas system, high pressure target platform, plasma generator, ion acceleration component and air supply system；
Described vacuum processing chamber includes bell jar, bottom plate, and described bell jar is placed in above bottom plate；
Described fine pumping system includes turbomolecular pump and rotary-vane vaccum pump, described vavuum pump and turbine point
Sub- pump connection, described turbomolecular pump suction inlet connect through bottom plate with vacuum processing chamber；
Described high pressure target platform includes target platform disk and insulating supporting seat, and described support base one end is fixed on bottom plate
On, the other end is fixed on target platform disk bottom and is supported fixation；
Described plasma generator includes radio-frequency power supply, central electrode and grid electrode；Set on described bottom plate
Some groups of bearing outer ring coolant jackets, described bearing outer ring coolant jacket is interior to set aperture plate, and hollow tube is set in described aperture plate；Institute
The hollow tube stated passes through target platform disk and bottom plate, and described aperture plate is connected through target platform disk and with bottom plate；Described radio frequency electrical
Source one end connecting bottom board, is connected to form grid electrode with aperture plate indirectly, if the other end is provided with the hollow tube phase of dry hole with tube wall
Company forms central electrode；
Described ion acceleration component includes large power high voltage pulse power supply and target platform electrode, is fixed on target platform disk lower end
Target platform electrode be connected through bottom plate with large power high voltage pulse power supply, the large power high voltage pulse power supply other end is connected with bottom plate
And it is grounded.
Further, described air supply system includes steel cylinder, gas mass flow gauge, magnetic valve and mixing chamber, if described
A dry gas mass flow gauge both ends connect magnetic valve respectively, and the magnetic valve at both ends is connected with steel cylinder, mixing chamber respectively；Described
Mixing chamber is connected with the central electrode in application of vacuum room.
Further, described vacuum processing chamber also includes form and sheet lead cover, and described sheet lead cover is placed in outside bell jar and will
Bell jar surrounds；Described form passes through sheet lead cover and bell jar.
Further, half range formula water channel cooling tube is set outside described bell jar.
Further, cooling oil inlet is provided with described bottom plate, cooling oil-out connects with coolant jacket.
A kind of processing method of bearing outer ring ball track strengthening and processing device is：
A, the bearing outer ring cleaned through ultrasonic wave is put into coolant jacket, is grid electrode and center in bearing outer ring
Electrode；
B, start rotary-vane vaccum pump, the atmospheric condition in application of vacuum room is extracted into 30Pa, turbomolecular pump starts work
Make, the vacuum degree control in application of vacuum room is arrived（2-3）×10-4Pa；
C, by the gas in steel cylinder, the ratio needed for is sent into mixing chamber, is re-fed into central electrode after mixing；Pass through center
Mixed gas is sent into hole on electrode to bearing outer ring inner side；
D, radio-frequency power supply establishes radio frequency discharge nitrogen, carbon, argon plasma, and free electron, which fully absorbs, in application of vacuum room penetrates
The energy of frequency electric field, radio frequency discharge nitrogen, carbon, argon plasma are encouraged；
E, cooling is started；
F, large power high voltage pulse power initiation, for providing negative high voltage pulsed bias to processed bearing outer ring, with reality
Apply ion implanting or thin film deposition process；
F, reducing motor is started, driving gear drives power transmission shaft and then drives driver plate rotation, and bearing outer ring is in target platform disk
Upper slowly to roll, bearing outer ring surface obtains more uniform implantation dosage；
G, vacuum chamber recovers normal pressure, cooling.
The present invention is accelerated by vacuum processing chamber, fine pumping system, high pressure target platform, plasma generator, ion
The cooperation of component and air supply system, form the ion implanting processing equipment of complete set.Radio-frequency power supply establish radio frequency discharge nitrogen,
Carbon, argon plasma, large power high voltage pulse power supply provides negative high voltage pulsed bias to processed bearing outer ring, to implement ion
Injection or thin film deposition process.Bearing outer ring is enclosed on grid electrode and central electrode so that the raceway of bearing outer ring obtain compared with
It is uniformly injected into dosage；Intensive treatment effect is more preferable.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Fig. 2 is the structural representation in present invention cooling adapter sleeve.
Connection diagrams of the Fig. 3 between bearing outer ring of the present invention and radio-frequency power supply, large power high voltage pulse power supply.
Embodiment
The present invention will be further described below in conjunction with the accompanying drawings.
A kind of bearing outer ring ball track strengthening and processing device, including vacuum processing chamber, fine pumping system, high pressure target platform,
Plasma generator, ion acceleration component and air supply system.
Vacuum processing chamber includes bell jar 1, bottom plate 2, and bell jar 1 is placed in the top of bottom plate 2；The present invention is provided with sheet lead cover 28 and is placed in
Bell jar is outer and surrounds bell jar；Form 29 passes through sheet lead cover and bell jar.In equipment running process simultaneously can produce grenz ray and
RF electromagnetic radiation, they have damage to human body, it is necessary to appropriate protection.In a device, because injecting voltage is less high, only
For 20-35kV, therefore the secondary electron energy knocked out by Ions Bombardment piece surface is not very high, soft X caused by wall
Ray also will not be too strong, but still may injure the health of staff.Vacuum is tightly wrapped up with the thick high-purity protection sheet leads of 3mm
Processing processing outdoor face, can effectively shield caused grenz ray, make the grenz ray dosage of vacuum processing chamber external leakage
The lowest dose level allowed far below on-radiation worker.
Fine pumping system includes turbomolecular pump 10 and rotary-vane vaccum pump 11, vavuum pump 11 and turbomolecular pump 10
Connection, the suction inlet of turbomolecular pump 10 connect through bottom plate 2 with vacuum processing chamber.
High pressure target platform includes target platform disk 31 and insulating supporting seat 30, and the one end of support base 30 is fixed on a base plate 2, the other end
It is fixed on the bottom of target platform disk 31 and is supported fixation.
Plasma generator includes radio-frequency power supply 12, central electrode and grid electrode；Some groups of bearings are set on bottom plate 2
Outer ring coolant jacket 6, aperture plate 3 is radially arranged in bearing outer ring coolant jacket 6, hollow tube 4, the upper end of hollow tube 4 are radially arranged in aperture plate 3
Closing；Hollow tube 4 passes through target platform disk 31 and bottom plate 2, and aperture plate 3 is connected through target platform disk 31 and with bottom plate；Radio-frequency power supply 12
One end is connected to form grid electrode, the other end is provided with by cable and tube wall with aperture plate 3 indirectly by cable connecting bottom board 2
If the hollow tube 4 of dry hole is connected to form central electrode.Hollow tube and back plate connections are provided with electrode insulation seal, aperture plate with
Target platform disk junction is provided with grid electrode insulating part, and both of which plays a part of insulated enclosure.
Ion acceleration component includes large power high voltage pulse power supply 26 and target platform electrode 8, is fixed on the lower end of target platform disk 31
Target platform electrode 8 be connected through bottom plate 2 by cable with large power high voltage pulse power supply 26, large power high voltage pulse power supply 26 is another
One end is connected and is grounded with bottom plate 2 by cable.Target platform electrode is provided with insulating sealer with back plate connections.
Air supply system includes steel cylinder 25,21,17, gas mass flow gauge 23,19,15, magnetic valve 22,24,18,20,14,
16 and mixing chamber 13, gas mass flow gauge both ends connect magnetic valve respectively, and the magnetic valve at both ends connects with steel cylinder, mixing chamber respectively
Connect；Mixing chamber is connected with the central electrode in application of vacuum room.Mixing chamber passes through the middle electrocardio in appendix and application of vacuum room
Pole connects.
Cooling oil inlet 7 is provided with the bottom plate of the present invention, cooling oil-out 9 connects with coolant jacket 6.Bearing outer ring cools down
Lead to transformer oil in set and make cooling matchmaker, flowed into through cooling down oil inlet, cooling oil-out outflow.Cool down oil inlet, cooling oil-out
Petroleum pipeline is connected, petroleum pipeline is connected by wall-passing device through bottom plate with outside fuel delivery device.
A kind of processing method of bearing outer ring ball track strengthening and processing device is：
A, the bearing outer ring cleaned through ultrasonic wave is put into coolant jacket, is grid electrode and center in bearing outer ring
Electrode；
B, start rotary-vane vaccum pump, the atmospheric condition in application of vacuum room is extracted into 30Pa, turbomolecular pump starts work
Make, the vacuum degree control in application of vacuum room is arrived（2-3）×10-4Pa；
C, by the gas in steel cylinder, the ratio needed for is sent into mixing chamber, is re-fed into central electrode after mixing；Pass through center
Mixed gas is sent into hole on electrode to bearing outer ring inner side；
D, radio-frequency power supply establishes radio frequency discharge nitrogen, carbon, argon plasma, and free electron, which fully absorbs, in application of vacuum room penetrates
The energy of frequency electric field, radio frequency discharge nitrogen, carbon, argon plasma are encouraged；In this course, the regulation impedance in radio-frequency power supply
The trimmer of adaptation, it can reduce the reflection power in circuit, the energy efficient of rf electric field is coupled to vacuum chamber
Interior, free electron fully absorbs the energy of rf electric field in vacuum chamber, has encouraged radio frequency discharge nitrogen or carbon plasma；
E, cooling is started；
F, large power high voltage pulse power initiation, for providing negative high voltage pulsed bias to processed bearing outer ring, with reality
Apply ion implanting or thin film deposition process；
G, reducing motor is started, driving gear drives power transmission shaft and then drives driver plate rotation, and bearing outer ring is in target platform disk
Upper slowly to roll, bearing outer ring surface obtains more uniform implantation dosage；
H, vacuum chamber recovers normal pressure, cooling.
Although giving detailed description and explanation to the embodiment of the present invention above, it should be noted that
We can carry out various equivalent changes and modification to above-mentioned embodiment according to the conception of the present invention, and its caused function is made
, all should be within protection scope of the present invention during with the spirit still covered without departing from specification.
Claims (6)
- A kind of 1. bearing outer ring ball track strengthening and processing device, it is characterised in that including vacuum processing chamber, fine pumping system, High pressure target platform, plasma generator, ion acceleration component and air supply system；Described vacuum processing chamber includes bell jar, bottom plate, and described bell jar is placed in above bottom plate；Described fine pumping system includes turbomolecular pump and rotary-vane vaccum pump, described vavuum pump and turbomolecular pump Connection, described turbomolecular pump suction inlet connect through bottom plate with vacuum processing chamber；Described high pressure target platform includes target platform disk and insulating supporting seat, and described support base one end is fixed on bottom plate, separately One end is fixed on target platform disk bottom and is supported fixation；Described plasma generator includes radio-frequency power supply, central electrode and grid electrode；Set on described bottom plate some Group bearing outer ring coolant jacket, described bearing outer ring coolant jacket is interior to set aperture plate, and hollow tube is set in described aperture plate；Described Hollow tube passes through target platform disk and bottom plate, and described aperture plate is connected through target platform disk and with bottom plate；Described radio-frequency power supply one Connecting bottom board is held, is connected to form grid electrode with aperture plate indirectly, the shape if other end is connected with hollow tube of the tube wall provided with dry hole Into central electrode；Described ion acceleration component includes large power high voltage pulse power supply and target platform electrode, is fixed on the target of target platform disk lower end Platform electrode is connected through bottom plate with large power high voltage pulse power supply, and the large power high voltage pulse power supply other end is connected and connect with bottom plate Ground；Described air supply system is connected with the central electrode in application of vacuum room.
- A kind of 2. bearing outer ring ball track strengthening and processing device according to claim 1, it is characterised in that described supply system System includes steel cylinder, gas mass flow gauge, magnetic valve and mixing chamber, and several described gas mass flow gauge both ends connect respectively Magnetic valve is connect, the magnetic valve at both ends is connected with steel cylinder, mixing chamber respectively；Described mixing chamber and the middle electrocardio in application of vacuum room Pole connects.
- 3. a kind of bearing outer ring ball track strengthening and processing device according to claim 1, it is characterised in that at described vacuum Reason room also includes form and sheet lead cover, and described sheet lead cover is placed in outside bell jar and surrounds bell jar；Described form passes through sheet lead Cover and bell jar.
- 4. a kind of bearing outer ring ball track strengthening and processing device according to claim 1, it is characterised in that outside described bell jar Half range formula water channel cooling tube is set.
- 5. a kind of bearing outer ring ball track strengthening and processing device according to claim 1, it is characterised in that on described bottom plate It is provided with cooling oil inlet, cooling oil-out connects with coolant jacket.
- 6. a kind of bearing outer ring ball track strengthening and processing device according to any claim in claim 1 to 5, it is handled Method is：A, the bearing outer ring cleaned through ultrasonic wave is put into coolant jacket, is grid electrode and central electrode in bearing outer ring；B, starting rotary-vane vaccum pump, the atmospheric condition in application of vacuum room is extracted into 30Pa, turbomolecular pump is started working, Vacuum degree control in application of vacuum room is arrived（2-3）×10-4Pa；C, by the gas in steel cylinder, the ratio needed for is sent into mixing chamber, is re-fed into central electrode after mixing；Pass through central electrode On hole to being sent into mixed gas on the inside of bearing outer ring；D, radio-frequency power supply establishes radio frequency discharge nitrogen, carbon, argon plasma, and free electron fully absorbs radio frequency electrical in application of vacuum room The energy of field, has encouraged radio frequency discharge nitrogen, carbon, argon plasma；E, cooling is started；F, large power high voltage pulse power initiation, for providing negative high voltage pulsed bias to processed bearing outer ring, with implement from Son injection or thin film deposition process；G, reducing motor is started, driving gear drives power transmission shaft and then drives driver plate rotation, and bearing outer ring delays on target platform disk Slow to roll, bearing outer ring surface obtains more uniform implantation dosage；H, vacuum chamber recovers normal pressure, cooling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510493669.3A CN105088164B (en) | 2015-08-13 | 2015-08-13 | A kind of bearing outer ring ball track strengthening and processing device and processing method |
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| CN201510493669.3A CN105088164B (en) | 2015-08-13 | 2015-08-13 | A kind of bearing outer ring ball track strengthening and processing device and processing method |
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| CN105088164B true CN105088164B (en) | 2018-01-26 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106180079B (en) * | 2016-07-07 | 2018-08-28 | 南京楚卿电子科技有限公司 | A kind of Nitrogen trifluoride plasma washing equipment |
| CN110605668B (en) * | 2019-09-29 | 2020-11-13 | 广州大学 | Reinforced machining mechanism and equipment for machining bearing outer ring roller path |
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| CN1851041A (en) * | 2006-05-19 | 2006-10-25 | 哈尔滨工业大学 | Bearing outer ring ball track ion injection and deposition combined treatment method |
| CN101302606A (en) * | 2007-05-11 | 2008-11-12 | 北京石油化工学院 | Magnesium alloy surface strengthening method and apparatus |
| CN101365289A (en) * | 2008-09-28 | 2009-02-11 | 哈尔滨工业大学 | Device and method for injecting ion on inner surface of hollow cathode coupling positive voltage bias voltage tube |
| CN101525738A (en) * | 2009-04-23 | 2009-09-09 | 哈尔滨工业大学 | Internal surface ion implantation modification device and method of inductively coupled plasmatube barrel |
| CN205011830U (en) * | 2015-08-13 | 2016-02-03 | 黄山迈瑞机械设备科技有限公司 | Bearing inner race raceway strengthening treatment device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3555928B2 (en) * | 1999-07-12 | 2004-08-18 | 独立行政法人産業技術総合研究所 | Surface modification method and surface modification device |
| JP3834617B2 (en) * | 2002-02-14 | 2006-10-18 | 独立行政法人産業技術総合研究所 | Bearing ball coating method |
-
2015
- 2015-08-13 CN CN201510493669.3A patent/CN105088164B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1851041A (en) * | 2006-05-19 | 2006-10-25 | 哈尔滨工业大学 | Bearing outer ring ball track ion injection and deposition combined treatment method |
| CN101302606A (en) * | 2007-05-11 | 2008-11-12 | 北京石油化工学院 | Magnesium alloy surface strengthening method and apparatus |
| CN101365289A (en) * | 2008-09-28 | 2009-02-11 | 哈尔滨工业大学 | Device and method for injecting ion on inner surface of hollow cathode coupling positive voltage bias voltage tube |
| CN101525738A (en) * | 2009-04-23 | 2009-09-09 | 哈尔滨工业大学 | Internal surface ion implantation modification device and method of inductively coupled plasmatube barrel |
| CN205011830U (en) * | 2015-08-13 | 2016-02-03 | 黄山迈瑞机械设备科技有限公司 | Bearing inner race raceway strengthening treatment device |
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Effective date of registration: 20171215 Address after: 245200 J06 block, Shexian Economic Development Zone, Anhui, Huangshan City, China Applicant after: HUANGSHAN MINGMINGDE BEARING Co.,Ltd. Address before: 245200 Shexian Economic Development Zone, Anhui, Huangshan City Applicant before: HUANGSHAN MAIRUI MACHINERY EQUIPMENT TECHNOLOGY Co.,Ltd. |
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Address after: 245200 J06 block, Shexian Economic Development Zone, Anhui, Huangshan City Patentee after: Huangshan mingmingde Group Co.,Ltd. Address before: 245200 J06 block, Shexian Economic Development Zone, Anhui, Huangshan City Patentee before: HUANGSHAN MINGMINGDE BEARING Co.,Ltd. |
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Denomination of invention: A device and method for strengthening raceway of bearing outer ring Effective date of registration: 20200903 Granted publication date: 20180126 Pledgee: Shexian Anhui rural commercial bank Limited by Share Ltd. Pledgor: Huangshan mingmingde Group Co.,Ltd. Registration number: Y2020980005659 |
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Date of cancellation: 20230818 Granted publication date: 20180126 Pledgee: Shexian Anhui rural commercial bank Limited by Share Ltd. Pledgor: Huangshan mingmingde Group Co.,Ltd. Registration number: Y2020980005659 |
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Denomination of invention: A device and method for strengthening the raceway of bearing outer ring Effective date of registration: 20230825 Granted publication date: 20180126 Pledgee: Shexian Anhui rural commercial bank Limited by Share Ltd. Pledgor: Huangshan mingmingde Group Co.,Ltd. Registration number: Y2023980053568 |