CN1179138C - Ceramic bearing ball - Google Patents
Ceramic bearing ball Download PDFInfo
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- CN1179138C CN1179138C CNB00105631XA CN00105631A CN1179138C CN 1179138 C CN1179138 C CN 1179138C CN B00105631X A CNB00105631X A CN B00105631XA CN 00105631 A CN00105631 A CN 00105631A CN 1179138 C CN1179138 C CN 1179138C
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- ball
- bearing
- micron
- ceramic bearing
- bearing ball
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Abstract
The present invention relates to a high-precision ceramic bearing ball for preventing the irregular vibration of hard disk drives. The ceramic bearing ball is characterized in that the roundness of the ball does not exceed 0.08 micron, surface roughness does not exceed 0.012 micron, and maximal surface pore size is about 5 microns.
Description
Technical field
The present invention relates to a kind of bearing ball, they can be used for computer hard disc driver, semiconductor wafer transfer device, HDD platform support and other device that requires low vibration to turn round.
Background technique
Use is arranged in ball between outer raceway and the interior raceway or the bearing means of roller is widely used in heavy industry in the big small equipment of electronic equipment, with rotary component reposefully.Traditionally, these bearing balls and roller are made with steel always, but have brought into use the stupalith manufacturing of silicon nitride and so in recent years.
Steel and Ultrafort Steel are the materials that bearing balls such as computer hard disc driver are selected for use till begging the present.Yet, along with the improvement of computer performance, require higher speed, therefore, needed to adopt stupalith (ball manufactured materials) to make bearing ball.Authorize on January 16th, 1996 bulletin in the U. S. Patent 5,485,331 of Dunifield etc. a kind of hard disk drive that comprises ceramic bearing ball has been described.
Because the density of stupalith generally is lower than the density of steel, so the weight of the material of ceramic bearing ball and frictional resistance are correspondingly lower.Also have, because the thermal expansion coefficient of stupalith is lower than the thermal expansion coefficient of steel, the precision of size can be improved.Stupalith requires the less advantage of oiling agent in addition.
Yet it still is not enough competent selecting stupalith to be used as bearing ball merely.For example, in the hard disc drive of computer, the irregular bear vibration when storage (writing) and sense data constitutes potential mortality defective.The ball that is used for this bearing requires than the bearing ball of uses such as lathe higher precision performance is arranged.
Summary of the invention
Therefore, the ceramic bearing ball of not advising the side vibration that the purpose of this invention is to provide a kind of hard disk drive that can prevent to contain ceramic bearing ball etc.
According to a first aspect of the invention, providing a kind of sphericity to be no more than 0.08 micron, rough surface is no more than 0.012 micron and maximum surface pore size and is 5 microns and is the ceramic balls of feature.
According to another aspect of the present invention, provide a kind of magnetic disk driver bearing that outer raceway and interior raceway is arranged and between raceway, hold a plurality of ceramic bearing balls.The raceway deviation of bearing is less than the groove spacing of hard disk memory channel, preferably less than half of the groove spacing of hard disk memory channel, more preferably less than 1/3rd of the groove spacing of hard disk memory channel.
Should understand, if the width between the memory channel on the harddisk surface of hard disc drive motor rotation less than the tolerance of sphericity, to can not get being recorded in the risk of the information/data that reads on the harddisk surface just big for laser or Magnetic reading head so.Its reason is, the deviation of motor bearing directly influences the accuracy of reading of data in the memory channel.This is because hard disk is to be located by the interior raceway of disk drive motor bearing or outer raceway.
Ceramic balls according to the present invention with above feature has the size accuracy of remarkable surface condition and height, therefore, when this ceramic balls bearing is used in the bearing of computer etc., irregular bear vibration seldom occurs.As a result, can reach data accurately and reliably writes and reads.
Description of drawings
Fig. 1 is the explanatory drawing of the maximum pore-size of expression;
Fig. 2 is the explanatory drawing of the laboratory equipment of definite extent of vibration.
Embodiment
Sphericity, rough surface and maximum pore sizing specification are as follows.
1. sphericity:
Use JIS B1501 standard to weigh ceramic bearing ball of the present invention about the steel ball rules.Use to measure the instrument of the maximum radial distance between corresponding circumference and the sphere, determine sphericity by measuring each other two or three equator sizes at right angle.
2. surface roughness
Still use according to the standard of the ball bearing steel ball of JIS B1501 and weigh ceramic bearing ball of the present invention.Therefore, the center line average roughness measured at a middle filling face by the surveying instrument (micro-type surface roughness measuring instrument) stipulated among the JIS B0651 of surface roughness is determined.
3. maximum pore size
Each is shown in Figure 1, and the maximum pore size is the maximum pore diameter that is exposed to hole on the ceramic bearing ball surface.Then the maximum pore diameter of the hole of maximum when a plurality of hole is arranged.For example, the measurement of maximum pore diameter can be undertaken by the surperficial image that uses the ceramic bearing ball that metallurgical microscope or scanning electron microscope measure.
Preferably, the maximum inner pore size of ceramic bearing ball of the present invention is no more than 5 microns.
This is to consider, if when a ceramic bearing ball has hole, these holes do not exist only in the surface of ball, and is present in the inside of ball.Therefore, when regulating and controlling the shape and size of ceramic bearing ball by the polishing ball, the hole of portion also must be exposed on the surface within it.
Preferably, make the main component of ceramic bearing ball, make the advantageous characteristic of aspects such as hardness, weight and friction loss are arranged in the ball with silicon nitride.Also can use other stupalith, for example composite of aluminium oxide, SiC, zirconium oxide, aluminium-zirconium oxide and cement etc.
An embodiment referring now to description of drawings ceramic bearing ball of the present invention.
The main component of ceramic bearing ball in this embodiment is a silicon nitride, and this ceramic balls contains for example silicon nitride, the aluminium oxide of 3% weight and the yittrium oxide of 3% weight of 94% weight.This ceramic balls bearing is a positive spheroid, and its diameter for example is 2 millimeters, and its sphericity is no more than 0.08 micron, for example 0.02 micron, surface roughness is no more than 0.012 micron, for example is 0.001 micron, and maximum surface pore size is no more than 5 microns, for example 2 microns.
The raw material of this ceramic bearing ball account for 1 to 10 part of weight with silicon nitride powder with the weight of sintering ingredient powder (for example mixture of aluminium oxide and yittrium oxide) and account for 100 parts and be mixed into slurry and prepare, and the mixture that obtains with purified water etc. as solvent wet mixing in ball milling or lapping machine close (perhaps powdered is closed in wet mixing).
Then slurry is delivered in the powder preparing apparatus, for example delivered in the sort of powder preparing apparatus shown in the Japanese patent application 290798/1998.So the powder of preparation by known rolling/lapping device moulding (grindings) for spherical by control gas pressure sintering in other words the hydraulic pressure sintering moulding spheroid that is obtained by grinding is sintered into the sintering body of silicon nitride.
In another method, above-mentioned slurry is formed the raw material powder by spray drying, be shaped to spheroid with known stress metal processing method then.The spheroid of moulding by the control gas pressure sintering in other words the hydraulic pressure sintering moulding spheroid is sintered into the sintering body of silicon nitride.
The type by control sintering auxiliary material and the average particle size of quantity, sintering temperature and pressure and raw material are controlled the pore-size of sintering body.For example, when the amount of sintering auxiliary material and sintering temperature and pressure increase keep raw-material medium grain size little simultaneously, in sintering, promoted raw-material compactness widely.As a result, hole is generally very little.
Therefore, control sintering auxiliary material and sintering condition, thus make maximum pore (after polishing, the becoming the surface pore) size of sintering body inside be no more than 5 microns.
Sintering diameter, sphericity and the surface roughness that obtains like this is by polishing control, thereby the formation diameter is no more than the silicon nitride ceramics bearing ball of 4 millimeters.
The sphericity of the ceramic bearing ball of Sheng Chaning is no more than 0.08 micron like this, and surface roughness is no more than 0.012 micron, and maximum surface pore size is no more than 5 microns.
When the ceramic bearing ball that obtains like this is used in the bearing in the hard disc drive of computer for example, irregular vibration seldom occurs, thereby can carry out writing and reading of data accurately and reliably.
Test,, now experimental detail is illustrated to confirm superiority of the present invention.But the present invention is not subjected to the restriction of this explanation.
By the sintering body ball of thermohydraulic production silicon nitride comprising as main component.Change sintering auxiliary material and calcination condition, the size of the inner pore of ball is fallen within the scope of the present invention.Polish the ball that sintering goes out then, thereby make in the scope in its sphericity and the surface roughness table below, to obtain the ceramic bearing ball of 1-10 sample of the present invention.
In the same way, by changing sintering auxiliary material and calcination condition, thereby make it different pore diameters and be made into comparative example, and these balls are polished sphericity and the surface roughness shown in the table 1 that makes it following, to be made into the ceramic bearing ball of comparative example 11-16.
The cutting ceramic bearing ball, and on its cutting surface, measure the maximum pore size.The results are shown among the table 1.When polishing ball surperficial, the hole of portion is exposed to the outside within it, thereby the overall dimensions of inner hole and the overall dimensions of surface pore are considered to identical.
As shown in Figure 2, these ceramic bearing balls 1 are arranged between outer raceway and the interior raceway 2,3 and form ball bearing, and, in fixing outer raceway 2, rotate the interior raceway 3 of each bearing, to carry out acoustics (vibration) detection.Detect the intensity of sound that produces during raceway with in the rotation of per minute 5000-10000 rotary speed outside on the raceway 2 by a sensor (MIC microphone), whether surpassed predetermined allowed band (promptly 30 decibels) with the loudness of a sound of checking output, thereby determined whether each bearing ball 1 has suitable surface characteristic and precision.The result also is shown among the table 1.In table 1, loudness of a sound is no more than 30 decibels sample and marks with zero (satisfaction), and loudness of a sound surpasses 30 decibels sample and marks with X (defective).
Table 1
| Sphericity (μ m) | Surface roughness (μ m) | Maximum pore size (μ m) | The result of vibration (acoustics) test | ||
| Sample of the present invention | 1 | 0.08 | 0.008 | 2 | ○ |
| 2 | 0.06 | 0.006 | 3 | ○ | |
| 3 | 0.04 | 0.005 | 2 | ○ | |
| 4 | 0.04 | 0.004 | 2 | ○ | |
| 5 | 0.03 | 0.005 | 5 | ○ | |
| 6 | 0.03 | 0.002 | 3 | ○ | |
| 7 | 0.02 | 0.001 | 2 | ○ | |
| 8 | 0.08 | 0.012 | 5 | ○ | |
| 9 | 0.03 | 0.002 | 1 | ○ | |
| 10 | 0.03 | 0.002 | 0 | ○ | |
| Compare sample | 11 | 0.25 | 0.025 | 10 | × |
| 12 | 0.13 | 0.020 | 3 | × | |
| 13 | 0.25 | 0.025 | 2 | × | |
| 14 | 0.10 | 0.005 | 3 | × | |
| 15 | 0.08 | 0.014 | 5 | × | |
| 16 | 0.08 | 0.008 | 7 | × |
By table 1 as seen, adopt the bearing (1-10 sample) of ceramic bearing ball of the present invention to be confirmed to be almost not vibration, thereby be applicable in the hard disk drive etc. of computer.On the other hand, use the relatively condition of the discontented unabridged version invention of ball bearing of sample (11-16 sample) ball, thereby cause bigger vibration and inapplicable.
The invention is not restricted to the embodiments described, and it can absorb different forms of implementation certainly and not depart from scope of the present invention.
The application introduces at this in full based on Japanese patent application 11-56999 number that declared on March 4th, 1999.
Claims (7)
1. a ceramic bearing ball is characterized in that, sphericity is no more than 0.08 micron, and surface roughness is no more than 0.012 micron and maximum surface pore and is of a size of 5 microns.
2. the described ceramic bearing ball of claim 1 is characterized in that, the maximum internal pore-size is 5 microns.
3. the described ceramic bearing ball of claim 1 is characterized in that, contains silicon nitride as its main component.
4. a hard disc drive motor bearing has interior raceway and outer raceway, accommodates a plurality of ceramic bearing balls between inside and outside raceway, it is characterized in that, the sphericity of described ceramic bearing ball is no more than 0.08 micron, and surface roughness is no more than 0.012 micron, and maximum surface pore is of a size of 5 microns.
5. the described hard disc drive motor bearing of claim 4 is characterized in that, the sphericity of ceramic bearing ball is that 0.02 micron, surface roughness are 0.001 micron and maximum surface pore is of a size of 2 microns.
6. the described hard disc drive motor bearing of claim 4 is characterized in that, the raceway deviation of bearing is less than the spacing of the memory channel of hard disk.
7. the described hard disc drive motor bearing of claim 6 is characterized in that, the raceway deviation of bearing is less than half of the spacing of the memory channel of hard disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB00105631XA CN1179138C (en) | 2000-04-13 | 2000-04-13 | Ceramic bearing ball |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB00105631XA CN1179138C (en) | 2000-04-13 | 2000-04-13 | Ceramic bearing ball |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1317652A CN1317652A (en) | 2001-10-17 |
| CN1179138C true CN1179138C (en) | 2004-12-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB00105631XA Expired - Fee Related CN1179138C (en) | 2000-04-13 | 2000-04-13 | Ceramic bearing ball |
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| Country | Link |
|---|---|
| CN (1) | CN1179138C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100359191C (en) * | 2003-03-04 | 2008-01-02 | 丁树华 | Non-metal light-load rolling bearing |
| CN100365295C (en) * | 2004-07-08 | 2008-01-30 | 沈阳建筑大学 | High precision hot press silicon nitride ceramic ball bearing and its manufacturing method |
-
2000
- 2000-04-13 CN CNB00105631XA patent/CN1179138C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1317652A (en) | 2001-10-17 |
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Granted publication date: 20041208 Termination date: 20130413 |