CN106217231B - A kind of deep groove ball bearing ring raceways superfinishing oilstone and its super precision method - Google Patents
A kind of deep groove ball bearing ring raceways superfinishing oilstone and its super precision method Download PDFInfo
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- CN106217231B CN106217231B CN201610607569.3A CN201610607569A CN106217231B CN 106217231 B CN106217231 B CN 106217231B CN 201610607569 A CN201610607569 A CN 201610607569A CN 106217231 B CN106217231 B CN 106217231B
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- oilstone
- sides
- ring raceways
- superfinishing
- ball bearing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B35/00—Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D15/00—Hand tools or other devices for non-rotary grinding, polishing, or stropping
- B24D15/02—Hand tools or other devices for non-rotary grinding, polishing, or stropping rigid; with rigidly-supported operative surface
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
Abstract
A kind of deep groove ball bearing ring raceways superfinishing oilstone, the oilstone is in the form of a column, it at least has around eight symmetrical sides of cylinder center line, mutual non-conterminous four sides in this eight sides are divided into two groups, two sides are plane and are parallel to each other in every group, it is mutually perpendicular between two groups of sides, one of which is when oilstone works all the time with covering coil axis keeping parallelism, for axial sides, another group side vertical with axial sides is vertical side, and the side between axial sides and vertical side is transition side；When carrying out superfinishing, by the end face ring raceways of oilstone and make the axial sides of oilstone all the time with covering coil axis keeping parallelism.Beneficial effect of the present invention：The present invention can improve the microstoning quality of ring raceways, can improve the microstoning efficiency of ring raceways, can save oilstone material.
Description
Technical field
The present invention relates to bearing machining field, specifically a kind of deep groove ball bearing ring raceways superfinishing oilstone and its
Super precision method.
Background technology
Deep groove ball bearing is a kind of rolling bearing being most widely used.Raceway groove is most important when being deep groove ball bearing operating
Working surface, its form accuracy and surface quality, there is important shadow to performances such as bearing operation precision and life-span and vibration noises
Ring.Raceway groove is located at deep ditch ball bearing ring surface, and its shape is anchor ring, and its axial truncatus is one section of circular arc（Hereinafter referred to as ditch
Shape circular arc）.
Superfinishing is a kind of traditional grinding process technique, abbreviation microstoning.The working method of microstoning is
Oilstone is pressed in workpiece surface with certain pressure floating ground and makees the small size higher-order of oscillation, meanwhile, workpiece surface with respect to oilstone make into
To motion.Microstoning can significantly reduce roughness and percent ripple, so as to improve workpiece surface quality.
In in general microstoning, oilstone shape of working surface is identical with workpiece surface shape, and both are in face contact
State, this allows oilstone to be preferentially ground in the range of the contact area of face to the microcosmic high point of workpiece surface, so as to have
Beneficial to the roughness and percent ripple for reducing workpiece surface.The shape of the oilstone working face contacted with workpiece is worn by oilstone itself
Formed, the geometrical relationship and relative motion relation depended primarily between oilstone and workpiece, and need not specially be repaired.
Microstoning for general surface, such as plane, the face of cylinder, sphere etc., oilstone shape of working surface are exactly corresponding plane, circle
Cylinder or sphere.
Microstoning is very universal in the application of bearing industry.The main purpose of deep groove ball bearing ring raceways microstoning
It is to reduce channel surface roughness, percent ripple and improve circularity to a certain extent, so as to improve bearing performance.Microstoning is
Last procedure in deep groove ball bearing ring raceways processing, has crucial effect to bearing finished products performance.
The commonly used deep groove ball bearing ring raceways super precision method of bearing industry is the side traditionally used always at present
Method, referred to as conventional method, its oilstone and processing mode used have following characteristics：（1）Oilstone is shaped as quadrangular, its cross section
For rectangle.（2）Initial positional relationship during superfinishing between oilstone and lasso is that oilstone end faces ring raceways, oilstone
In four sides, two vertical with set coil axis, two other and lasso diameter parallel.（3）During superfinishing between oilstone and lasso
Movement relation be that lasso rotates in fixed axis around own axes, oilstone is pressed in ring raceways surface simultaneously with certain pressure floating ground
Make dead axle swing, its axis of oscillation is perpendicular to set coil axis and by the Gou Xing center of arc of raceway groove.
Features described above based on oilstone used and processing mode, conventional method have some limitations.Due to oilstone work
Making face shape and ring raceways shape can not be fitted like a glove so that contact of the oilstone working face with channel surface is unable to reach typically
Surface contact state in superfinishing, this not only influences the surface quality index such as the roughness of raceway groove, percent ripple after microstoning, even
The form accuracy of raceway groove circular arc ditch shape can be influenceed.Now there are some researches show, if oilstone initialization face shape and ring raceways are justified
Torus shape is completely the same, then the swing of oilstone and the rotation of lasso can produce movement interference, and the place for interfering most serious is oil
4 folding corner regions of stone working face.
In view of the above-mentioned limitation of traditional raceway groove super precision method, there has been proposed a variety of different super precision methods, such as, one
Kind of method is to make the orientation of oilstone axis of oscillation into consistent with covering coil axis, and another method is that the posture of oilstone is changed into side
Face tilts relative to set coil axis, and makes a diagonal of oilstone cross section rectangle vertical with set coil axis, hereafter will be this
Method is referred to as the tilting superfinishing method of oilstone.However, although these methods overcome the limitation of conventional method in some aspects,
Other aspects generate new limitation, such as, when the orientation of oilstone axis of oscillation is consistent with set coil axis, oilstone abrasive particle is relative
No longer intersected in the movement locus of channel surface, this can influence microstoning quality and efficiency, and channel surface also without
Method forms the netted lines that can produce beneficial effect.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of deep groove ball bearing ring raceways superfinishing oilstone and its surpassed
Precision method, for overcoming the limitation of existing raceway groove super precision method.
The present invention is that technical scheme is used by solving above-mentioned technical problem：A kind of deep groove ball bearing ring raceways superfinishing
With oilstone, the oilstone is in the form of a column, and it at least has around eight symmetrical sides of cylinder center line, by this eight sides
Mutual non-conterminous four sides are divided into two sides in two groups, every group and are plane and are parallel to each other, and are mutually hung down between two groups of sides
Directly, one of which is axial sides, vertical with axial sides is another when oilstone works all the time with covering coil axis keeping parallelism
Group side is vertical side, vertical with covering coil axis when vertical side swings to face ring raceways in the oilstone course of work,
Side between axial sides and vertical side is transition side, transition side cause oilstone can mitigate in the course of the work with
Interference between ring raceways；
The distance between two vertical sides are the main width of oilstone, and the width of axial sides is oilstone time width, two axles
It is the main thickness of oilstone to the spacing between side, the sideways width that hangs down is oilstone time thickness, oilstone time width and the main width of oilstone
The ratio of degree, and the ratio of oilstone time thickness and the main thickness of oilstone is 0.4 ~ 0.7.
The transition side of column oilstone of the present invention is plane or circular arc camber or other curved surfaces or combinatorial surface.
Oilstone of the present invention is shaped as eight prisms that all sides are plane.
Oilstone of the present invention time width is the half of the main width of oilstone；Oilstone time thickness is the half of the main thickness of oilstone.
The method that using the oilstone deep groove ball bearing ring raceways are carried out with superfinishing, by the end face lasso ditch of oilstone
Road simultaneously makes the axial sides of oilstone be pressed in ring raceways surface simultaneously all the time with covering coil axis keeping parallelism with certain pressure floating ground
Make dead axle swing, its axis of oscillation is perpendicular to set coil axis and by the Gou Xing center of arc of raceway groove, while lasso is around itself axle
Line rotates in fixed axis.
The unilateral swing angle of oilstone of the present invention is no more than 18 °.
The beneficial effects of the invention are as follows：（1）The microstoning efficiency of ring raceways can be improved.Oilstone mistake of the present invention
Four angular zones where crossing side do not have oilstone material, greatly reduce the movement interference degree between oilstone and lasso, make oilstone
Shape of working surface and the degree of agreement of ring raceways surface configuration improve, and there is more and distribution widely mill on oilstone surface
Grain participates in superfinishing, so as to improve microstoning efficiency.
（2）The microstoning quality of ring raceways can be improved.Compared with conventional method, this method is due to alleviating corner
The interference in region, the microstoning Quality advance of ring raceways bottom section can be made；On the other hand, although participating in the lateral areas of raceway groove two
The oilstone material of domain superfinishing has been reduced, and can still ensure the microstoning quality in the region；Compared with the tilting superfinishing method of oilstone, this
The oilstone material that invention carries out superfinishing to raceway groove two side areas dramatically increases, and can make the region microstoning Quality advance, and
The insufficient limitation of the tilting superfinishing method raceway groove both sides of the edge region superfinishing of oilstone can be overcome, so as to improve the super of ring raceways
Finish quality.
（3）Compared with the oilstone of conventional method, four angular zones where oilstone transition side of the present invention do not have oilstone material
Material, therefore oilstone material can be saved.
Brief description of the drawings
Fig. 1 is the microstoning schematic diagram of the present invention；
Fig. 2 is oilstone structural representation of the present invention；
Fig. 3 is that oilstone contacts area schematic with raceway groove.
Marked in figure：01st, deep groove ball bearing inside race, 02, be shaped as the oilstones of eight water chestnut posts, nn, oilstone axis of oscillation,
Oo, lasso pivot center.
Embodiment
A kind of deep groove ball bearing ring raceways superfinishing oilstone, the oilstone are in the form of a column, and it at least has around cylinder center
Eight symmetrical sides of line, mutual non-conterminous four sides in this eight sides are divided into two sides in two groups, every group
For plane and it is parallel to each other, is mutually perpendicular between two groups of sides, one of which is kept with set coil axis all the time when oilstone works
It is parallel, it is axial sides, another group side vertical with axial sides is vertical side, and vertical side is in the oilstone course of work
Vertical with set coil axis when swinging to face ring raceways, the side between axial sides and vertical side is transition side, mistake
Side is crossed so that oilstone can mitigate the interference between ring raceways in the course of the work；
The distance between two vertical sides are the main width of oilstone, and the width of axial sides is oilstone time width, two axles
It is the main thickness of oilstone to the spacing between side, the sideways width that hangs down is oilstone time thickness, oilstone time width and the main width of oilstone
The ratio of degree, and the ratio of oilstone time thickness and the main thickness of oilstone is 0.4 ~ 0.7.
Further, the transition side of column oilstone is plane or circular arc camber or other curved surfaces or combinatorial surface.
Further, oilstone is shaped as eight prisms that all sides are plane.
Further, oilstone time width is the half of the main width of oilstone；Oilstone time thickness is the half of the main thickness of oilstone.
The method that using the oilstone deep groove ball bearing ring raceways are carried out with superfinishing, by the end face lasso ditch of oilstone
Road simultaneously makes the axial sides of oilstone all the time with covering coil axis keeping parallelism, and vertical side is when oilstone swings to face ring raceways
With set coil axis it is vertical, ring raceways surface is pressed in certain pressure floating ground and makees dead axle swing, its axis of oscillation perpendicular to
Cover coil axis and by the Gou Xing center of arc of raceway groove, while lasso rotates in fixed axis around own axes.
Further, the unilateral swing angle of oilstone is no more than 18 °.
As shown in Fig. 2 side where wherein AH and DE is mutually perpendicular to side where BC and FG, with reference to Fig. 1, AH and DE institutes
It is axial sides in side, correspondingly, BC and FG places side are vertical side, and side where AB, CD, EF and HG is transition side
Face；The distance between line segment BC and FG are the main width of oilstone, and line segment AH and DE length are oilstone time width；Line segment AH and DE it
Between distance be the main thickness of oilstone, line segment BC and FG length are oilstone time thickness.
Position relationship between oilstone and lasso is：During superfinishing, two axial sides of column oilstone remain
With lasso diameter parallel, and its vertical side when oilstone swings to face ring raceways with set coil axis it is vertical, such as Fig. 1 institutes
Show.
The present invention obtains the technical principle of beneficial effect, can be according to the spy of macroscopically oilstone and ring raceways contact zone
Sign, grind principle according to superfinishing and illustrate.Restricted by superfinishing working method, the oilstone to be fitted like a glove with channel shape is initial
Working face, movement interference can occur with channel surface in oilstone swing process, this is combined with oilstone wearing character so that oil
The actual contact situation of stone and raceway groove is sufficiently complex.For traditional super precision method and its oilstone used, this interference is in oilstone
Four angular zones are the most serious.Although oilstone shape of working surface in theory and is misfitted with channel shape, oilstone and raceway groove it is true
Real contact is restricted in the range of their macroscopical contact zone by macroscopical contact zone, thus oilstone and raceway groove macroscopic view are connect
The analysis in tactile area efficiency can be ground to superfinishing and quality problems illustrate.
Macroscopically the contact zone of oilstone and raceway groove is as shown in Figure 3.When Fig. 3 is that oilstone swings to face ring raceways, with
View in the vertical plane of oilstone short transverse.Typical eight prisms oilstone and ring raceways in Special-shaped oilstone of the present invention
Contact area be the ABCDEFGH regions shown in Fig. 3, it is shaped as octagon；Contact of traditional super precision method oilstone with lasso
Region is the JKLI regions shown in Fig. 3, and it is shaped as quadrangle；For the tilting superfinishing method of oilstone, the contact zone of oilstone and lasso
Domain is the MNOP regions shown in Fig. 3, and its shape is also quadrangle but posture is different from traditional super precision method.
With reference to Fig. 3, the effect of technical principle and acquirement to the present invention is described as follows in terms of four：
（1）Compared with conventional method, the present invention conventional method contact zone four angular zones, i.e. ABI, CDJ in Fig. 3,
Region represented by EFK, GHL, there is no oilstone material, so as to greatly reduce the movement interference degree between oilstone and lasso, make
Oilstone shape of working surface and the degree of agreement of ring raceways surface configuration improve, and oilstone surface has more and distribution more extensive
Abrasive particle participate in superfinishing, so as to improve microstoning efficiency；
（2）In the contact area of oilstone and lasso of the present invention, in the rectangular area of face bottom of trench, i.e. Fig. 3 represented by BCFG
The oilstone material in region can carry out more fully superfinishing to trench bottom region.Trench bottom region is the main work of ring raceways
Make region, in bearing operation contact of the raceway groove with steel ball occur mainly in this region, the superfinishing quality in this region is to bearing
Performance impact is maximum.Compared with conventional method, the interference of method of the invention due to alleviating the angular zone of conventional method oilstone four,
It is improved the microstoning quality in trench bottom region；Compared with the tilting superfinishing method of oilstone, due to BCGF area surfaces in Fig. 3
Product is more than NadPcb region areas, and the oilstone material that this method carries out superfinishing to trench bottom region is more, and distribution is bigger,
There is the more and wider abrasive particle of distribution to participate in superfinishing（Be advantageous to improve superfinishing efficiency and quality）, and can be bigger
The ripple high point on scope Automatic-searching trench bottom surface is ground（Be advantageous to improve percent ripple）, so that trench bottom
Microstoning better quality.
（3）In the contact area of oilstone and lasso of the present invention, against the region of raceway groove both sides, i.e. ABGH and CDEF in Fig. 3
Two represented trapezoid areas, its oilstone material can carry out superfinishing to the surface of raceway groove two side areas.Compared with conventional method,
Interference of this method due to alleviating four angular zones, although the oilstone material for participating in raceway groove two side areas superfinishing has been reduced, still
The microstoning quality of raceway groove two side areas can be ensured.Compared with the tilting superfinishing method of oilstone, because ABGH region areas show in Fig. 3
Work is more than Mad region areas, and the oilstone material that this method carries out superfinishing to raceway groove two side areas is more, makes raceway groove two side areas
Superfinishing is more efficient, microstoning better quality, and can overcome the tilting superfinishing method raceway groove both sides of the edge region of oilstone（Scheme
3 section line regions）The insufficient limitation of superfinishing.The oil of raceway groove both sides of the edge region superfinishing is participated in the tilting superfinishing method of oilstone
Stone material, it is the material in the Meh and Ofg regions in Fig. 3, the two region areas are too small, participate in the oilstone abrasive particle quantity of superfinishing
Less and distribution is small, inadequate to the material removal ability in raceway groove both sides of the edge region, and it is insufficient to easily cause the region superfinishing.
（4）The inventive method saves oilstone material than conventional method, because ABCDEFGH region areas are less than IJKL in Fig. 3
Region area.
The similitude with deep groove ball bearing raceway groove property based on angular contact ball bearing and thrust ball bearing ring raceways,
To the method slightly modified of the present invention, you can add suitable for the superfinishing of angular contact ball bearing and thrust ball bearing ring raceways
Work.Such modification is still fallen within the protection domain of this patent.
Choosing the main thickness of oilstone needs to consider that its pros and cons on superfinishing effect influences and balanced.The main thickness of oilstone
When degree chooses larger, favourable aspect is：The abrasive particle quantity that oilstone surface puts into grinding simultaneously is more, and oilstone automatically selects raceway groove table
The scope that the microcosmic ripple high point in face carries out differential grinding is wide, is advantageous to improve grinding efficiency and improves percent ripple；Disadvantageously
It is：Oilstone working face and the interference degrees in channel shape face increase when oilstone is swung, diverse location oilstone working ability in contact zone
Difference also increase, cause raceway groove crudy uniformity decline even processing efficiency reduce.Compared with conventional method, this method
Because in the absence of the more serious movement interference of the angular zone of conventional method contact zone four, choosing the main thickness of oilstone under similarity condition can
With larger than the oilstone thickness of conventional method, so as to improve superfinishing efficiency to a greater degree and improve percent ripple.Choose oilstone
Main thickness also needs to consider the size of raceway diameter.
The Main Basiss for choosing the main width of oilstone are channel width and oilstone swing angle, and to weigh the main width of oilstone compared with
The pros and cons influences caused by big.After given oilstone swing angle, the maximum of the main width of oilstone should ensure that oilstone is put
Its vertical side can should ensure that oil on the outside of raceway groove completely into raceway groove, the minimum value of the main width of oilstone when moving extreme position
Its vertical side can measure up to trench edges out of raceway groove when stone swings to reverse limit position, and the actual main width of oilstone should be
Chosen between this minimum value and maximum.When the main width value of oilstone is larger, its Beneficial Effect to superfinishing effect is：Raceway groove
Both sides of the edge region（Hatched region as shown in Figure 3）Superfinishing it is more abundant because there is more oilstone abrasive particles input should
The grinding in region；Adverse effect is：The chance of the oilstone material input grinding of the vertical lateral edge near zone of oilstone is less, from
Body is not easy to wear away so that the central region easily worn away on oilstone surface can not better contact with raceway groove, so as to influence ditch
The superfinishing effect of road central region.The reason for oilstone material input grinder of the vertical lateral edge near zone of oilstone can be less
It is that these materials have more chance to be swung on the outside of raceway groove, such as, when oilstone swings to face raceway groove, as shown in Figure 3
Oilstone material on the outside of two shadow regions is at grinding without putting on the outside of raceway groove.
Compared with conventional method, method of the invention due to the vertical lateral edge near zone of oilstone oilstone material compared with
It is few, itself be not easy to wear away caused by adverse effect it is smaller, the main width of oilstone is chosen under similarity condition can compare conventional method
Oilstone width it is larger, so as to a greater degree improve superfinishing effect.
Embodiment
Below by taking the deep groove ball bearing bear inner ring grooved railway superfinishing of model 61818 as an example, illustrate Special-shaped oilstone of the present invention
In typical eight prisms oilstone relative dimensions selection.According to design drawing, it is known that 61818 deep groove ball bearing bear inner ring grooved railway are related
Geometric parameter is：Raceway diameter 96.356mm, rib diameter 98.855mm, Contact stress 3.679mm.
Based on bear inner ring grooved railway diameter, consider the main thickness of oilstone influences on the pros and cons of superfinishing effect, takes oilstone
Main thickness is 30mm, and oilstone time thickness takes the half i.e. 15mm of the main thickness of oilstone.
According to above-mentioned known 61818 deep groove ball bearing bear inner ring grooved railway geometric parameter calculate channel width is 7.002mm.Choosing
It is 18 ° to take oilstone one side swing angle.Consider the main width of oilstone influences on the pros and cons of superfinishing effect, takes oilstone master
Width is 7.5mm, and oilstone time width takes the half of the main width of oilstone, is 3.5mm.
Claims (5)
- A kind of 1. deep groove ball bearing ring raceways superfinishing oilstone, it is characterised in that：The oilstone is in the form of a column, its at least have around Eight symmetrical sides of cylinder center line, mutual non-conterminous four sides in this eight sides are divided into two groups, every group Two sides are plane and are parallel to each other, and are mutually perpendicular between two groups of sides, one of which when oilstone works all the time with lasso Axis keeping parallelism, it is axial sides, another group side vertical with axial sides is vertical side, and vertical side is in oilstone work Vertical with covering coil axis when face ring raceways are swung to during work, the side between axial sides and vertical side is transition Side, transition side cause oilstone to mitigate the interference between ring raceways in the course of the work；The distance between two vertical sides are the main width of oilstone, and the width of axial sides is oilstone time width, two axial sides Spacing between face is the main thickness of oilstone, and the sideways width that hangs down is oilstone time thickness, oilstone time width and the main width of oilstone Ratio, and the ratio of oilstone time thickness and the main thickness of oilstone is 0.4 ~ 0.7.
- A kind of 2. deep groove ball bearing ring raceways superfinishing oilstone according to claim 1, it is characterised in that：The column The transition side of oilstone is plane or circular arc camber or other curved surfaces or combinatorial surface.
- A kind of 3. deep groove ball bearing ring raceways superfinishing oilstone according to claim 1, it is characterised in that：The oilstone Be shaped as eight prisms that all sides are plane.
- A kind of 4. deep groove ball bearing ring raceways superfinishing oilstone according to claim 1, it is characterised in that：Oilstone time is wide Spend for the half of the main width of oilstone；Oilstone time thickness is the half of the main thickness of oilstone.
- 5. using oilstone described in claim 1 deep groove ball bearing ring raceways are carried out with the method for superfinishing, it is characterised in that：By oil The end face ring raceways of stone simultaneously make the axial sides of oilstone all the time with covering coil axis keeping parallelism, with certain pressure floating ground It is pressed in ring raceways surface and makees dead axle swing, in ditch shape circular arc of its axis of oscillation perpendicular to set coil axis and by raceway groove The heart, while lasso rotates in fixed axis around own axes.
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| CN201610607569.3A CN106217231B (en) | 2016-07-29 | 2016-07-29 | A kind of deep groove ball bearing ring raceways superfinishing oilstone and its super precision method |
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|---|---|---|---|
| CN201610607569.3A CN106217231B (en) | 2016-07-29 | 2016-07-29 | A kind of deep groove ball bearing ring raceways superfinishing oilstone and its super precision method |
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Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4136488A (en) * | 1977-08-29 | 1979-01-30 | Ex-Cell-O Corporation | Honing machine |
| CN2657860Y (en) * | 2003-10-30 | 2004-11-24 | 庄乾国 | Oilstone |
| JP5045040B2 (en) * | 2006-09-14 | 2012-10-10 | 株式会社ジェイテクト | Super finishing whetstone |
| CN201102196Y (en) * | 2007-10-31 | 2008-08-20 | 浙江四通轴承集团有限公司 | Special-shaped oilstone |
| CN101549471B (en) * | 2009-05-18 | 2010-08-11 | 浙江大学 | Super grinding whetstone for cylindrical roller with logarithmic camber |
| CN101733700A (en) * | 2009-11-17 | 2010-06-16 | 浙江五洲新春集团有限公司 | Superfine grinding method for rolling bearing |
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Application publication date: 20161214 Assignee: Luoyang Rencheng Bearing Accessories Co., Ltd. Assignor: Henan University of Science and Technology Contract record no.: X2019980000437 Denomination of invention: Oilstone and method for superfinishing of ring groove of deep groove ball bearing Granted publication date: 20180410 License type: Common License Record date: 20191104 |