CN100404893C - Dynamic pressure bearing production method - Google Patents
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- CN100404893C CN100404893C CNB200510118510XA CN200510118510A CN100404893C CN 100404893 C CN100404893 C CN 100404893C CN B200510118510X A CNB200510118510X A CN B200510118510XA CN 200510118510 A CN200510118510 A CN 200510118510A CN 100404893 C CN100404893 C CN 100404893C
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Abstract
Dynamic pressure bearing production method is disclosed in the invention, which is characterized in that: perform ultrasonic machining on an end face, on which an axial dynamic pressure recessed portion is formed, of the cylindrical sintered bearing material conditioned with a density of 6.6-7.4 Mg/m<3 >, so that the end face has more density. Subsequently, the axial dynamic pressure recessed portion is formed on the end face, followed by a radial dynamic pressure recessed portion formed on an inner peripheral face of the sintered beating material.
Description
Technical field
The present invention relates to a kind of lubricated manufacture method that obtains the hydraulic bearing of high bearing rigidity with fluid generation dynamic pressure of lubricated wet goods that makes, particularly a kind of manufacture method of making sintered bearing have high dimensional accuracy and forming axial hydrodynamic recess and radial dynamic pressure recess both sides with highi degree of accuracy according to desirable shape of being used to.The hydraulic bearing that obtains in the present invention is suitable as the bearing of the spindle drive motor that has recording disk drive device etc.
Background technique
Above-mentioned spindle drive motor is widely used in CDs such as driving disk or CD, DVD as driving source and on the various information machines such as disk drive device of the read-write of carrying out information on these dishes.Again, above-mentioned spindle drive motor also is widely used in as driving source on the mirror drives such as laser printer.Bearing as this spindle drive motor adopts ball bearing more, but it is having boundary aspect running accuracy, high speed, the noise reduction, as the bearing of these characteristic goods and use the hydraulic bearing of non-contact type.
So-called hydraulic bearing be on the micro-gap between axle and the bearing, form the oil film that forms by lubricant oil, thereby the rotation by axle makes the high bearing of supporting axle rigidly of this oil film high-pressure trend, this dynamic pressure generation effectively by recess on a certain side who is formed on axle or bearing, that mainly formed by groove.The bearing that spindle drive motor is used is to bear axially to reach the radially structure of both sides' load, under the above-mentioned recess of dynamic pressure generation usefulness is formed on situation on the bearing, the end face (axial vane surface) that is respectively formed at the bearing that bears thrust load with bear on the bearing inner peripheral surface (sagittal plane) of radial load.As such hydraulic bearing, can contain lubricant oil and self-adding and to form the above-mentioned recess and the mass productivity of dynamic pressure generation usefulness easily high, so preferably use sintered bearing.
Sintered bearing is to packing lubrication oil with the press-powder body sintering of metallic dust compression forming and in the pore of the sintering body (porous plastid) that obtains, and uses under the oil condition containing.Lubricant oil oozes out from sintered bearing, and resemble on the micro-gap between as described above and the axle and form oil film, thus the rotation that flow into lubricant oil and axle in the dynamic pressure recess high bearing rigidity of high-pressure trend ground supporting axle accordingly.As the dynamic pressure recess sintered bearing raw material are formed by plastic working.
The situation that in the bearing of spindle drive motor, has the dynamic pressure of comparing the axial vane surface side with sagittal plane to set significantly.In order to increase the dynamic pressure of axial vane surface, as long as this surperficial pore of crushing and make its densification, to prevent the spilling of lubricant oil, to be the leakage of dynamic pressure and guarantee that oil pressure gets final product.Again, thus this structure because help the reduction of surface friction drag and the raising of durability preferred.Handle means as the sealing of hole of axial vane surface, open flat 8-33260 communique or spy by the spy and open flat 11-51055 communique etc. and disclose the enforcement ultrasonic machining and axial vane surface is carried out sealing of hole handle, utilize this method can implement sealing of hole at short notice effectively and handle.
Above-mentioned ultrasonic machining adopts following method, promptly for example under with the situation of an end face as the sintered bearing of axial vane surface, the end face of its opposition side is put on the platform of hard, is pressed into an end face on from the top ultrasonic vibration body and applies ultrasonic vibration.But this method produces distortion owing to meet with stresses so the two end part of the raw-material inner peripheral surface of sintered bearing are outstanding a little to the inside on axle direction.Produce the problem that is difficult to obtain the high hydraulic bearing of dimensional accuracy thus.Such problem can be by improving the raw-material density of sintered bearing and hardness being eliminated than the highland setting.But, can produce new problem in this case, promptly on sagittal plane, form the radial dynamic pressure recess and be difficult to form by plastic working.
The raw-material density of sintered bearing is generally 6.5Mg/m
3About, form the radial dynamic pressure recess as described above easily with this density, but the axial hydrodynamic recess is arranged because a bit not enough tendency of formation tartly that is difficult to of hardness, again, forming after the ultrasonic machining on the axial hydrodynamic recess, owing to ultrasonic machining produces the distortion that the diameter at axis hole two end part shrinks a little.On the other hand, if the raw-material density of sintered bearing is too high, though then because the influence that ultrasonic machining produces suppresses distortion than I, opposite radial dynamic pressure recess is owing to more then be difficult to form.
Summary of the invention
Therefore, the raw-material distortion of sintered bearing that the object of the present invention is to provide a kind of ultrasonic machining that suppresses owing to axial vane surface to produce, and axial side and this two side's of radial side dynamic pressure recess is formed the manufacture method of the such hydraulic bearing of desirable shape.
The invention is characterized in, density is adjusted into 6.6～7.4Mg/m
3The end face of the raw-material formation axial hydrodynamic of sintered bearing cylindraceous recess implement ultrasonic machining, make this end face than the more densification of aforementioned density, after this, on this end face, form the axial hydrodynamic recess, then on the raw-material axis hole inner peripheral surface of sintered bearing, form the radial dynamic pressure recess.
Owing to by ultrasonic machining axial vane surface is carried out sealing of hole and handle, be suitable as the hydraulic bearing that the spindle drive motor that bears bigger thrust load is used so prevented the leakage of the dynamic pressure on axial vane surface among the present invention.At this moment, owing to the sintered bearing raw material density of using in the present invention is adjusted into than common 6.6 high～7.4Mg/m
3So, also improved hardness and rigidity with comparing usually.Thus, even apply ultrasonic machining at the end face (axial vane surface) that axial hydrodynamic takes place while go up the stress that loads on the axle direction, also can suppress the outstanding to the inside distortion of inner peripheral surface at two ends, its result can obtain the high hydraulic bearing of dimensional accuracy.Again, if as densification axial vane surface on formation axial hydrodynamic recess, then the axial hydrodynamic recess can form tartly, obtains wishing such shape.
After forming above-mentioned axial hydrodynamic recess, on the raw-material inner peripheral surface of sintered bearing, form the radial dynamic pressure recess, but the raw-material density of sintered bearing is adjusted into than common height in the present invention, but not too high level to the plastic working difficulty.Thus, the radial dynamic pressure recess is adopted following method to form to wish such shape, promptly with the pin that is formed with prominent bar and pin is passed or press again and duplicate etc. with the core that is formed with the bar of dashing forward.If form the radial dynamic pressure recess, then, also obtain high radial dynamic pressure easily so guarantee oil pressure easily owing to can reduce the porosity of radial dynamic pressure recess with such method again.
Axial hydrodynamic recess of the present invention is preferably the shape that can obtain axial hydrodynamic effectively, for example, the a plurality of chevron-notchs that perhaps form V word shape, arrange towards the mode of a circumferencial direction of aforementioned end face with the pointing direction on its summit have been enumerated along with towards a circumferencial direction of end face bent a plurality of spiral chutes that extend of all lateral bendings in it on one side on one side.
Again, radial dynamic pressure recess of the present invention is preferably the shape that can obtain radial dynamic pressure effectively, has enumerated for example with the raw-material external diameter decentraction of aforementioned sintered bearing and along with a plurality of arc surfaces towards the inside all side undergauges of an aforementioned circumferencial direction.
According to hydraulic bearing of the present invention, be defined as 6.6～7.4Mg/m owing to form the raw-material density of sintered bearing that axially reaches the radial dynamic pressure recess
3Axial vane surface is carried out forming the axial hydrodynamic recess after ultrasonic machining makes its densification, after this, on the raw-material inner peripheral surface of sintered bearing, form the radial dynamic pressure recess, so play following effect, can suppress the raw-material distortion of sintered bearing that the ultrasonic machining owing to axial vane surface produces and obtain high dimensional accuracy, the dynamic pressure that prevents axial vane surface is leaked and is obtained high axial hydrodynamic, and axial side and radial side both sides' dynamic pressure recess can be formed and wish such shape.
Description of drawings
Fig. 1 is the longitudinal section of the hydraulic bearing of one embodiment of the present invention.
Fig. 2 is the plan view of the hydraulic bearing of a mode of execution.
Fig. 3 is the sectional view that the direction of arrow of the III-III line of Fig. 1 is observed.
Fig. 4 is the state of ultrasonic machining is implemented in expression to the raw-material upper-end surface of sintered bearing by supersonic machining apparatus a side view.
Fig. 5 is that expression is by pressing the side view that forms the spiral fluted state with metal pattern on the raw-material upper-end surface of sintered bearing again.
Fig. 6 is expression is formed with the state of separating vessel and arc surface on the raw-material inner peripheral surface of sintered bearing by the inner peripheral surface processing device a side view.
Fig. 7 is to use the longitudinal section of bearing unit of the hydraulic bearing of a mode of execution.
Fig. 8 is the plan view of hydraulic bearing of other modes (chevron-notch) of expression axial hydrodynamic recess.
Fig. 9 A～Fig. 9 E forms the result's that the surface roughness of face along the circumferential direction measures figure to spiral fluted with representing to carry out in an embodiment.
Embodiment
Below, with reference to accompanying drawing one embodiment of the present invention is described.
Fig. 1 represents to utilize the manufacture method of a mode of execution and the hydraulic bearing cylindraceous 1 made, and Fig. 2 is the plan view of hydraulic bearing 1, and Fig. 3 is the sectional view that the direction of arrow of the III-III line of Fig. 1 is observed.Reference character 2 among these Fig. 1 and Fig. 3 is the axles that rotate supporting freely by hydraulic bearing 1.
On an end face (upper-end surface among Fig. 1) 11 of hydraulic bearing 1, separate in a circumferential direction as shown in Figure 2 and equally spaced be formed with a plurality of (being 12 in this case) spiral chute 12, this spiral chute 12 is along with extending on one side towards the inside on one side all lateral bendings of the sense of rotation R of axle 2 are bent.The end of the outer circumferential side of these spiral chutes 12 is at the outer circumferential face opening, and the end of interior all sides not opening and obturation on the inner peripheral surface 14 of axis hole 13.The upper-end surface 11 of hydraulic bearing 1 is the axial vane surface that bears from the thrust load of axle 2, and spiral chute 12 is axial hydrodynamic recesses of axial hydrodynamic generation usefulness.
On the other hand, on the inner peripheral surface 14 of hydraulic bearing 1, separate in a circumferential direction as shown in Figure 3 and equally spaced be formed with a plurality of (being 5 in this case) separating vessel 15, these separating vessel 15 sections are the semicircle arcuation and extend as the crow flies along axle direction between both ends of the surface.Be formed with arc surface 16 between each separating vessel 15 of inner peripheral surface 14, being shaped as of this arc surface 16 is eccentric and along with towards the sense of rotation R of axle 2 and inside all side undergauges with respect to the axle center P of the external diameter of hydraulic bearing 1.The inner peripheral surface 14 of hydraulic bearing 1 is the sagittal plane that bears from the radial load of axle 2, and arc surface 16 is radial dynamic pressure recesses of radial dynamic pressure generation usefulness.
The external diameter decentraction of above-mentioned each arc surface 16 and hydraulic bearing 1, the center of each arc surface 16 separate equally spaced be present in axle center P around, promptly with the concentric circumferencial direction of this axle center P on.The shape of micro-gap between arc surface 16 and axle 2 the outer circumferential face by such arc surface 16 forms towards the sense of rotation of axle 2 and narrow and small gradually section wedge-like.
(1) shaping～sintering of material powder
For example the mixed-powder that iron powder and material powders such as copper powder are mixed with suitable composition is filled in the metal pattern that powder forming uses and carries out compression forming, thereby obtains and the press-powder body of hydraulic bearing 1 approximate shapes made.In addition, as the material powder that uses, preferably adopt as iron: 40～60wt%, copper: 40～60wt%, tin: iron powder and copper powder homogenous quantities roughly 1～5wt% forms, all the other contain the glass putty of several wt%.
That is, on the characteristic of the copper good, intensity is improved owing to containing more iron as the agglomerated material of main component with processability, and then, owing to containing the tin of running-in ability and plastic working to(for) axle 2 are further improved.Thus, make to form separating vessel 15, arc surface 16 and spiral chute 12 by plastic working and become easily, and reduced friction factor, improved wear resistance performance.
Then, the press-powder body is carried out heat-agglomerating, obtain sintered bearing raw material cylindraceous with the temperature and time corresponding with material powder.In embodiments of the present invention, for the raw-material density of sintered bearing is adjusted into 6.6～7.4Mg/m
3, pressure and temperature during sintering etc. of material powder when the compression forming controlled.
(2) the raw-material processing of sintered bearing
A. the ultrasonic machining of upper-end surface (axial vane surface)
Use 4 pairs of sintered bearing raw material of supersonic machining apparatus 1A shown in Figure 4 axial vane surface, be that ultrasonic machining are implemented in above-mentioned upper-end surface 11, this face is carried out sealing of hole handles.Supersonic machining apparatus 4 is made of following: mould 41 becomes base station and is become by super copper; Oscillator 42 supports and sends ultrasound freely by not shown lowering or hoisting gear lifting; Die 43, be coniform, axially consistent with vertical direction and greatly directly the side end face that is disposed at upside, this big footpath side be installed on the oscillator 42; Discoid cutter 44, cutter 44 is fixed on the lower end surface of die 43.
Use this device 4 at first will with axle direction as the sintered bearing raw material 1A mounting of above-below direction to be positioned at cutter 44 under the surface of mould 41 on.Then, oscillator 42 is descended and make upper-end surface 11 butts of cutter 44 and sintered bearing raw material 1A and then become pressed state, then make oscillator 42 work.Die 43 sends the ultrasound of dither on axle direction as a result, and this ultrasound passes on the sintered bearing raw material 1A from cutter 44.Upper-end surface 11 to the sintered bearing raw material 1A of cutter 44 butts applies impact repeatedly thus, and with at a high speed and the vibration repeatedly of little amplitude and apply rag processing, the wall of this upper-end surface 11 produces plastic flow and the pore that is exposed to the surface is carried out sealing of hole.
In this plays sound wave processing, the selection aptly in carrying out the suitable scope that sealing of hole handles of the pressing force of pushing with 44 pairs of sintered bearing raw material of cutter 1A, the output power of dither and frequency.Be that the output power of 70～700kPa, dither and frequency are respectively under 50～2000W, the 10～50kHz and carry out for example, can under the processing time about 1～5 second, fully carry out sealing of hole according to these conditions and become the state of having implemented polishing at pressing force.
B. (axial vane surface) gone up and formed spiral chute in the upper-end surface
As shown in Figure 5, to be placed in like that as shown through the sintered bearing raw material 1A of above-mentioned A operation on pressure-sizing that has mould 51, last low punch 52,53 and axle 54 or the metal pattern of pressure again 5 that embossing is used, use 52,53 couples of sintered bearing raw material 1A of low punch and on axle direction, press again, press again simultaneously with this on the upper-end surface 11 of having carried out the sealing of hole processing, to form spiral chute 12.In this case, on the punch face of upper punch 52, form a plurality of protuberance 52a that can form spiral chute 12, the punch face of this matrix is impacted and mint-mark protuberance 52a on the upper-end surface 11 of sintered bearing raw material 1A, thereby form spiral chute 12.
C. go up at inner peripheral surface (sagittal plane) and form separating vessel and arc surface
Fig. 6 represents to have the inner peripheral surface processing device 6 of mould 61,62, matrix pin 63 up and down, utilizes this device 6, and mounting patrix 61 on the counterdie 62 of stationary state will embed through the sintered bearing raw material 1A of above-mentioned B operation and be arranged in the patrix 61.Be pressed into the axis hole 13 of sintered bearing raw material 1A from the top by the matrix pin 63 that can form separating vessel 15 and arc surface 16, on inner peripheral surface 14, form separating vessel 15 and arc surface 16.
After this, convex pin 63 is extracted from sintered bearing raw material 1A and sintered bearing raw material 1A extracted from patrix 61 and obtain in the upper-end surface 11 being formed with spiral chute 12, be formed with the hydraulic bearing 1 of separating vessel 15 and arc surface 16 at inner peripheral surface 14.
The bearing of the dynamic bearing unit 3 of the spindle drive motor that the hydraulic bearing that below obtains like that 1 is used as hard disk drive for example shown in Figure 7 and using.This dynamic bearing unit 3 rotates supporting axle 2 freely, and the surface (upper-end surface 11) that will be formed with spiral chute 12 is disposed at upside and accommodates in the housing that the round-ended cylinder shape is arranged 31 of top opening among the figure.
Chimeric and secure bond is on the axle main body 21 of axle 2 with axial gasket 22, and axle main body 21 top from figure is inserted in the axis hole 13 of hydraulic bearing 1, and axial gasket 22 disposes opposed to each other with upper-end surface 11 hydraulic bearing 1, that be formed with spiral chute 12.The radial load of axle 2 is born by the inner peripheral surface 14 of hydraulic bearing 1, and the thrust load of axle 2 is born by the upper-end surface 11 of hydraulic bearing 1.Micro-gap to formation supplying lubricating oil between between the inner peripheral surface 14 of hydraulic bearing 1 and the axle the main body 21 and upper-end surface 11 of hydraulic bearing 1 and the axial gasket 22.Be equipped with recording disc via the rotatingshaft wheel hub on the part in this dynamic bearing unit 3 above leaning on than the axial gasket 22 of axle main body 21.
The fixedly connected cover 34 that has the sheet material by ring-type to constitute on the open end of housing 31.Utilize this cover 34 can suppress splashing of above-mentioned lubricant oil and make the axial gasket 22 and cover 34 butts of the axle 2 on floating, thereby prevent that axle 2 from coming off.
Above-mentioned dynamic bearing unit 3 is that penetrating oil makes oil-impregnated bearing on hydraulic bearing 1.If the axle 2 that inserts in the axis hole 13 rotates along Fig. 2 and arrow R direction shown in Figure 3, then ooze out lubricant oil in each separating vessel 15 that is stored in inner peripheral surface 14 and be rolled on the axle 2 efficiently and enter in the micro-gap of the wedge-like between arc surface 16 and the axle 2, thus the formation oil film.The lubricant oil that enters into this micro-gap produces the chock effect by the narrow and small side that flow to micro-gap, thereby form high pressure high radial dynamic pressure takes place.Like this, the part of oil film high-pressure trend and arc surface 16 separate in a circumferential direction accordingly equally spaced and take place, and the radial load of axle 2 is balanced thus, the rigidity highland supporting.
On the other hand, lubricant oil also oozes out and is stored on the upper-end surface 11 of hydraulic bearing 1 in the spiral chute 12 that forms, and the part of this lubricant oil flows out in the spiral chute 12 by the rotation of axle 2, forms oil film between upper-end surface 11 and axial gasket 22.Again, remain in the outer circumferential side inside all side flow of lubricant oil in the spiral chute 12 in the spiral chute 12, the axial hydrodynamic of maximal pressureization takes place on the end of interior all sides.This axial hydrodynamic is born by axial gasket 22, thereby axle 2 is in the state on a little floating, and thrust load is balanced thus, the supporting of rigidity highland and axle 2 be in the state on floating a little, and thrust load is balanced thus, the rigidity highland supporting.
According to 1 manufacture method of above-mentioned hydraulic bearing, because the density of the sintered bearing raw material 1A before will process is adjusted into than common 6.6 high～7.4Mg/m
3So these sintered bearing raw material 1A has also improved hardness and rigidity with comparing usually.Thus, even while the stress that the upper-end surface 11 that axial hydrodynamic takes place is loaded on the axle direction applies ultrasonic machining, the two end part that also can suppress inner peripheral surface 14 are outstanding to the inside, and its result uprises the dimensional accuracy of hydraulic bearing 1.
Again, upper-end surface 11 is implemented that sealing of holes are handled and the leakage that can prevent axial hydrodynamic, be suitable as the bearing that the spindle drive motor that bears bigger thrust load uses and use by utilizing ultrasonic machining.And then, be formed at densification upper-end surface 11 on spiral chute 12 can form tartly and obtain wishing such shape.
Then, after forming spiral chute 12, on the inner peripheral surface 14 of sintered bearing raw material 1A, form separating vessel 15 and arc surface 16, but owing to the density of sintered bearing raw material 1A is adjusted into than common height and not too high level to the plastic working difficulty, so separating vessel 15 and arc surface 16 can be formed the such shape of hope.Again, inner peripheral surface 14 since density than high and harder usually, so also separating vessel 15 and arc surface 16 can be formed tartly, so and guarantee oil pressure easily and obtain high radial dynamic pressure easily owing to bubble rate is lower.
In addition, as the axial hydrodynamic recess, except spiral chute shown in Figure 2 12, also preferably adopt a plurality of chevron-notchs 17 shown in Figure 8.This chevron-notch 17 is V word shape and separates equally spaced in a circumferential direction and arranging, and the direction that converges on its summit is that the sense of rotation R along axle 2 forms.Each chevron-notch 17 integral body is the shapes towards the inside all lateral bending songs of the sense of rotation R of axle 2, with the end of above-mentioned spiral chute 12 same outer circumferential sides at the outer circumferential face opening, the end of interior all sides is in inner peripheral surface 14 upper sheds of axis hole 13.
Embodiment
Then, embodiments of the invention are described, thereby understand effect of the present invention.
Use copper powder as material powder: 49 quality %, iron powder: 49 quality % and glass puttys: the mixed-powder of 2 quality %, change forming pressure and carry out compression forming, with the press-powder body sintering that obtains, making 8 kinds of density is 6.5～7.6Mg/m
3The sintered bearing raw material.For these sintered bearing raw material, utilize the method described in the above-mentioned mode of execution, remove and be used for a kind of of comparison, one end face is carried out sealing of hole by ultrasonic machining to be handled, then, shape identical separating vessel shown in Figure 2 and arc surface on this end face, thus the hydraulic bearing of the test portion sequence number 1～8 shown in the table 1 obtained.In this case, test portion sequence number 5 is the test portion of unreal Shih-chao's sound wave processing.
[table 1]
| The test portion sequence number | Density Mg/m 3 | Ultrasonic machining | The cylindricity um of |
| 1 | 6.4 | Have | 0.8 |
| 2 | 6.6 | Have | 1.0 |
| 3 | 6.8 | Have | 1.0 |
| 4 | 7.0 | Have | 1.0 |
| 5 | 7.0 | Do not have | 1.0 |
| 6 | 7.2 | Have | 1.2 |
| 7 | 7.4 | Have | 1.2 |
| 8 | 7.6 | Have | 1.6 |
Internal diameter of bearing after pressing again has that the upper end portion is big, the less tendency in underpart, if this difference is bigger, then radial dynamic pressure is big, less in the upper end portion in the underpart, and the vibration of axle increases.Thus, measure the internal diameter size of bearing upper end portion, central part, underpart, the maximum value of these sizes and the difference of minimum value are estimated as cylindricity for the hydraulic bearing of test portion sequence number 1～8.That is, the difference in size of the more little then upper and lower end face of cylindricity is more little, radial dynamic pressure get over homogeneous and can suppress the axle vibration.This cylindricity is recorded in the table 1 together.
The cylindricity of judging along with the raising internal diameter of the raw-material density of sintered bearing according to table 1 becomes greatly gradually, if the raw-material density of sintered bearing surpasses 7.4Mg/m
3Then the cylindricity of internal diameter sharply increases.Consider from the angle of cylindricity thus, judge the raw-material density of sintered bearing and be necessary at 7.4Mg/m
3Below, particularly preferably be 7.0Mg/m
3Below.
And then, for the test portion of the test portion sequence number 1,2,4,5,7 of table 1, along the circumferential direction measure the surface roughness that spiral fluted forms face.Its result represents in Fig. 9 A～Fig. 9 E.Judge if sintered bearing raw material density is identical, have or not the hydraulic bearing that carries out the different test portion sequence number 4 of ultrasonic machining (Fig. 9 C) and test portion sequence number 5 (Fig. 9 D) to compare according to Fig. 9 A～Fig. 9 E, the hydraulic bearing of then having implemented the test portion sequence number 4 of ultrasonic machining diminishes surface roughness owing to the pore by the ultrasonic machining end face is filled, so can prevent the leakage of dynamic pressure effectively.Again, the dynamic pressure of judging the spiral fluted edge clear and can obtaining wishing.
On the other hand, so judge in the hydraulic bearing of the test portion sequence number 5 of not implementing ultrasonic machining owing to having bigger position, a plurality of surface roughnesses part, being the residual leakage that has pore that dynamic pressure takes place.Judge the spiral fluted edge and do not understand that the dynamic pressure effect of generation is also less again.Confirmed that according to above being to implement before forming spiral chute on the bearing face ultrasonic machining comes end face is carried out the effect that the sealing of hole processing produces.
Judge the not enough 6.6Mg/m of the raw-material density of sintering according to Fig. 9 A～Fig. 9 E
3The hydraulic bearing of test portion (Fig. 9 A) of test portion sequence number 1 no matter whether implemented ultrasonic machining and all had the bigger part in a plurality of surface roughnesses part, therefore residual have pore and spiral fluted edge not to understand.Consider this be because the raw-material density of sintering is lower, be that the raw-material pore amount of sintered bearing is too much, even it is also insufficient to implement the filling of ultrasonic machining pore.
On the other hand, judging in the raw-material density of sintering is 6.6Mg/m
3In above test portion sequence number 2 (Fig. 9 B), test portion sequence number 4 (Fig. 9 C), the test portion sequence number 7 (Fig. 9 E) surface roughness less, be that pore is filled, the spiral fluted edge clear.Thus, judging the raw-material density of sintered bearing is necessary at 6.6Mg/m
3More than.
According to above confirmed to be to form on the raw-material end face of sintered bearing before the axial hydrodynamic recess to the raw-material end face of sintered bearing implement ultrasonic machining effect, and in this case the density of sintered bearing with 6.6～7.4Mg/m
3, preferably with 6.6～7.0Mg/m
3For good.
Claims (3)
1. the manufacture method of a hydraulic bearing is characterized in that, density is adjusted into 6.6～7.4Mg/m
3The end face of the raw-material formation axial hydrodynamic of sintered bearing cylindraceous recess implement ultrasonic machining, make this end face than the more densification of aforementioned density, after this, on this end face, form the axial hydrodynamic recess, then on the raw-material axis hole inner peripheral surface of sintered bearing, form the radial dynamic pressure recess.
2. the manufacture method of hydraulic bearing as claimed in claim 1, it is characterized in that, aforementioned axial dynamic pressure recess is along with towards the bent a plurality of spiral chutes that extend on one side of the inside on one side all lateral bendings of a circumferencial direction of aforementioned end face, or a plurality of chevron-notchs that form V word shape, arrange towards the mode of a circumferencial direction of aforementioned end face with the pointing direction on its summit.
3. the manufacture method of hydraulic bearing as claimed in claim 1 is characterized in that, aforementioned radial dynamic pressure recess is with the raw-material external diameter decentraction of aforementioned sintered bearing and along with a plurality of arc surfaces towards the inside all side undergauges of an aforementioned circumferencial direction.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004312347A JP4420339B2 (en) | 2004-10-27 | 2004-10-27 | Manufacturing method of hydrodynamic bearing |
| JP2004312347 | 2004-10-27 |
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| Publication Number | Publication Date |
|---|---|
| CN1766357A CN1766357A (en) | 2006-05-03 |
| CN100404893C true CN100404893C (en) | 2008-07-23 |
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| CNB200510118510XA Expired - Fee Related CN100404893C (en) | 2004-10-27 | 2005-10-27 | Dynamic pressure bearing production method |
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| CN (1) | CN100404893C (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4811186B2 (en) * | 2006-08-07 | 2011-11-09 | 日本電産株式会社 | Hydrodynamic bearing device |
| KR100863938B1 (en) | 2007-01-31 | 2008-10-16 | 에이테크솔루션(주) | Spindle motor for hard disk drive |
| CN110594287A (en) * | 2019-09-17 | 2019-12-20 | 福建福清核电有限公司 | Main pump integrated three-liquid-tank radial water guide bearing bush |
| JP2022139908A (en) * | 2021-03-12 | 2022-09-26 | Ntn株式会社 | Oil-impregnated sintered bearing and fluid dynamic pressure bearing device with the same |
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| DE10300966A1 (en) * | 2003-01-14 | 2004-07-29 | Daimlerchrysler Ag | Manufacturing sliding layer on cast body by supersonic cold-gas particle impaction, introduces particles exclusively into and onto sliding surface of body |
| WO2004072498A1 (en) * | 2003-02-14 | 2004-08-26 | Hitachi Powdered Metals Co., Ltd. | Oil impregnated sintered bearing |
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| JPH11336760A (en) * | 1998-05-28 | 1999-12-07 | Ntn Corp | Dynamic pressure type sintered oil-impregnated bearing |
| CN1400077A (en) * | 2001-07-27 | 2003-03-05 | 株式会社三协精机制作所 | Electrolytic machining process, dynamic pressure bearing and its machining process |
| DE10300966A1 (en) * | 2003-01-14 | 2004-07-29 | Daimlerchrysler Ag | Manufacturing sliding layer on cast body by supersonic cold-gas particle impaction, introduces particles exclusively into and onto sliding surface of body |
| WO2004072498A1 (en) * | 2003-02-14 | 2004-08-26 | Hitachi Powdered Metals Co., Ltd. | Oil impregnated sintered bearing |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2006125461A (en) | 2006-05-18 |
| CN1766357A (en) | 2006-05-03 |
| JP4420339B2 (en) | 2010-02-24 |
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