CN1786494A - Method of mfg. fluid bearing - Google Patents

Abstract

There is disclosed a manufacture method of a fluid bearing, which includes the following steps: first, providing a plurality of substructure bodies forming the said bearing, each substructure body having a butt surface connected the other substructure bodies; then, butting each substructure body each other according to the butt surface and primary forming the shape of the said fluid bearing and at last, sintering the interbutted substructure bodies to make them become an integrated one.

Description

The FDB manufacture method

[technical field]

The present invention relates to the bearing manufacture method, particularly a kind of FDB manufacture method.

[background technique]

Present stage, be wearing and tearing and the reduction noise that reduces the revolution part, increase the service life, FDB is applied in the motor more and more, particularly in fields such as Winchester disk drive motor, CD-ROM drive motor, printer polygonal mirror motors, even radiation fan also has the trend of a large amount of employing FDB.

FDB is to form a layer fluid (can be gas or liquid) lubricating film between rotating shaft and bearing, utilizes the lubricating film build-up pressure with supporting revolving shaft, and rotating shaft is not directly contacted with bearing, thereby prevents wearing and tearing and noise.Rely on the advantage of low wearing and tearing and low noise, FDB is able to extensive utilization in industrial circle.

According to the generation type of this lubricating film, FDB is broadly divided into fluid-dynamic bearing (being called for short " hydraulic bearing " down) and hydrostatic profile FDB (being called for short " hydrostatic bearing " down).Hydraulic bearing is to utilize the viscid characteristic of fluid self and form lubricant film layer between rotating shaft and bearing according to principle of hydrodynamics, and the lubricating fluid of hydrostatic bearing after to be outer Pressure generator will pressurize imports in the bearing play.

And be the effect that improves the build-up pressure of lubricating film, increasing the bearing capacity of bearing, the dealer can be provided with pressure at bearing inner surface usually and produce groove.

Pressure produces groove various ways, sees also Figure 10, with herring-bone form flute 100, or claims that " V " type flute is the most common.And for example shown in Figure 11, the dealer also has employing to set up the pressure of hierarchic structure to produce groove 200 at bearing inner surface, and dotted line is depicted as rotating shaft.Thereby the Flow Field Distribution that the pressure of above-mentioned herring-bone form flute 100 and hierarchic structure generation groove 200 all can improve in the bearing play improves key pointers such as bearing load carrying capacity and rigidity.

Present stage, the processing mode of above-mentioned pressure generation groove generally is the processing axle axially motion in brearing bore with a high speed rotating, thereby the cutter of utilization processing axle front end cuts or extruding bearing inner surface formation pressure produces groove.Yet along with the compact day by day demand of electronic product, bearing also requires to make more and more forr a short time, and it may require its external diameter less than 0.5 centimeter, and its internal diameter is littler.The above-mentioned pressure generation of processing groove is then very difficult in narrow space like this.For another on institute say that the shape that pressure produces groove is closely related with the effect of build-up pressure, but because of the restriction in the above-mentioned making, be difficult in actual product, to realize that the variation that pressure produces groove designs.

In view of this, industry is being sought a kind of FDB manufacture method that overcomes above-mentioned processing procedure difficulty always.

[summary of the invention]

The technical problem that desire of the present invention solves provides a kind of FDB manufacture method, relative prior art, and this method relatively easily pressure of process fluid bearing produces groove.

For solving the problems of the technologies described above, FDB manufacture method of the present invention may further comprise the steps: at first, provide to constitute a sub-structure more than this bearing, each substructure body has the interface that combines with other substructure body; Then each substructure body is docked mutually by its interface, begin to take shape the shape of this FDB; At last, the substructure body of this mutual butt joint of sintering becomes one it.

Wherein, above-mentioned substructure body is provided with partial pressure separately and produces groove, and after above-mentioned substructure body butt joint, above-mentioned partial pressure produces groove and produces groove in conjunction with the complete pressure that forms this FDB.

Because the present invention adopts a plurality of parts butt joints then with the method for its sinter bonded, pressure produces groove and can be produced on partially respectively on the substructure body, utilize the combination of substructure body can form complete pressure generation groove, the more existing flute processing mode of this kind mode is easy.And complicated flute can be divided into a plurality of simple flutes earlier selectively via method of the present invention to be made separately, so helps diversified flute design.

[description of drawings]

Fig. 1 is the flow chart of FDB manufacture method of the present invention.

Fig. 2 is the generalized section of each member alignment of FDB of first embodiment of the invention.

Fig. 3 is the generalized section behind the sintering of FDB in first mode of execution

Fig. 4 is the mould generalized section of making the member of FDB in first mode of execution.

Fig. 5 is the schematic perspective view of counterdie among Fig. 4, and wherein the counterdie top and the bottom are cut off.

Fig. 6 is the generalized section of each member alignment of FDB of second embodiment of the invention.

Fig. 7 is a part mould schematic representation of making the member of FDB in second mode of execution.

Fig. 8 is the generalized section of each member alignment of FDB of third embodiment of the invention.

Fig. 9 is that the solid of the FDB of the 3rd mode of execution is shown the decomposition intention.

Figure 10 is a kind of generalized section of existing FDB.

Figure 11 is the cross sectional representation of another kind of existing FDB.

[embodiment]

To be example below, and introduce the present invention with reference to accompanying drawing with a hydraulic bearing, all are graphic be all schematically graphic.

Seeing also Fig. 1, is the manufacturing process that hydraulic bearing is shown, and is broadly divided into for three steps.At first, prepare a plurality of substructure bodies separately, the shape of described substructure body is corresponding with the local shape of the hydraulic bearing that desire is made, and makes described substructure physical efficiency constitute complete hydraulic bearing; Then, via described substructure body being combined into semi-finished product, begin to take shape the shape of this hydraulic bearing in conjunction with program; At last, via these semi-finished product of sintering routine processes, the finished product that makes it to become one.

See also Fig. 2 and Fig. 3, for implementing first mode of execution of the present invention.In this embodiment, two substructure body 10a and 10b of the hydrodynamic pressure bearing 10 " the following bearing 10 that abbreviates as " that constitutes a column can be axially docked at first independent preparation.This two substructures body 10a, 10b are hollow article, and its relative axial end has interface 12.Via in conjunction with program this two substructures body 10a, 10b butt joint being formed semi-finished product, these semi-finished product of sintering form the finished product of one, promptly complete bearing 10 then.

In in conjunction with program, can utilize impressed pressure that the adjacent interface 12 of two-phase is closely contacted, also can between the adjacent interface 12 of two-phase, both coating binder be sticked together.This interface 12 is stepped, so helps realizing Dock With Precision Position.Certainly, this interface 12 also can be arranged to the plane.

In the sintering program, make these semi-finished product become the densification sintering bearing by high temperature sintering.Controllable sintering temperature is at 0.5～0.8 times of the bearing material fusing point, under this temperature, near the interface 12 of substructure body 10a and 10b atom interpenetrates, thereby two substructure body 10a and 10b are become one, and interface 12 disappears because of the atom spreading factor.

These bearing 10 inwalls are formed with pressure and produce groove 14.This pressure produces groove 14 and comprises some conduit 14a, 14b to being provided with along these bearing 10 inner circumference directions, and conduit 14a, 14b form an angle.The present invention is located at each respectively on this two substructures body 10a, the 10b conduit 14a, 14b.That is, for any a pair of conduit, conduit 14a is located on the substructure body 10a, and conduit 14b is located on the substructure body 10b.Promptly produce groove 14 after this two substructures body 10a, the 10b butt joint in conjunction with forming complete pressure.In the present embodiment, each is connected to interface 12 places mutually to conduit 14a, 14b, therefore constitutes one " V " type pressure and produces groove 14.

When will be somebody's turn to do two-part conduit that " V " type pressure produces groove 14 set up separately to two substructure body 10a, 10b last after, the conduit that the conduit 14a of each substructure body 10a or 10b or 14b are single rotation direction so helps making this pressure generation groove 14.Introducing the making method of a kernel texture body below, but need statement, below only is a kind of feasible method, and the claimant does not get rid of other method of making the substructure body.

Seeing also Fig. 4, is the schematic representation of die cast substructure body 10a or 10b, is example with substructure body 10a in the accompanying drawing.Mould part comprises the die holder 80 of a hollow, stretches into the patrix 84 and the counterdie 82 (male model) of these die holder 80 hollow portions.Patrix 84 has an endoporus 842 that can allow counterdie 82 tops enter.So, form a space between die holder 80, patrix 84 and the counterdie 82, the shape in this space is identical with the substructure body 10a that desires moulding.Fill after the raw material in this space, and patrix 84 downward punching presses also can form this substructure body 10a after cooling.

Continuous see also Fig. 5, these counterdie 82 peripheries are provided with the projection 822 of some single rotation directions, need statement at this, are clear these projections 822 that show, adopt the very technique of painting of exaggeration in graphic, and in actual product, the height of these projections 822 may be little of 10 microns.The shape of these projections is corresponding with the conduit 14a of substructure body 10a with size.So, when patrix 84 punching presses form this substructure body 10a, this conduit of moulding simultaneously 14a.Because these projections 822 are single rotation directions, so can separate this substructure body 10a and counterdie 82 by the rotating stripping demoulding mode, projection 822 damage conduit 14a in the time of the demoulding can being avoided like this during the demoulding.

In the present embodiment, each produces groove 14 to conduit 14a, 14b formation " V " the type pressure that joins, and this only is the special case of present embodiment.The present invention produces groove with partial pressure to be located at respectively on each substructure body, makes pressure produce groove and make easily that the pressure that therefore can make multiple shape produces groove.

In the above method of squeeze forming, conduit 14a is and substructure body 10a moulding simultaneously.Also can be after moulding substructure body 10a, again by other this conduit of machining tool moulding 14a.

Seeing also Fig. 6, is to implement another mode of execution of the present invention, and this mode of execution and aforementioned embodiments are similar substantially, and institute's difference is: bearing 20 docks then by three sub-structures 22,24,26 that sintering forms.Each substructure body is provided with partial pressure and produces groove, forms complete pressure after the butt joint and produces groove.

The substructure body 22,26 that is arranged in two ends is similar to the substructure body of first mode of execution, also can use similar methods to make.The axial two ends of the substructure body 24 in the middle of being positioned at are provided with rotation direction opposite conduit 25a, 25b.The then corresponding projection that is provided with the different rotation directions in two places on the mould.As shown in Figure 7, mould can be made up of two-part, and wherein a part is provided with the projection 90a of corresponding conduit 25a, and another part is provided with the projection 90b of corresponding conduit 25b.Because rotation direction is opposite, these two-part are separately according to oneself the rotation direction demoulding.

Below introduced two and three bearing manufacture methodes that the axial butt joint of sub-structure is sintered into one then respectively, be appreciated that ground, can will be sintered into one then more than three sub-structure butt joints as required.

Seeing also Fig. 8 and Fig. 9, is to implement another embodiment of the invention.Different with the axially butt joint of aforementioned embodiments, this mode of execution docks the complete bearing 30 that sinters a column then in a circumferential direction with two substructure body 30a, 30b.Each substructure body 30a or 30b are tile, and its both sides at circumferencial direction are formed with interface 32, and this interface 32 is also stepped.Along the circumferential direction be provided with some pressure on each substructure body 30a or the 30b intrados and produce groove 34 (conduit on the substructure body 30b is invisible), after the butt joint, described pressure produces the complete pressure generation groove that groove 34 constitutes bearing 30.Be appreciated that ground, according to actual needs, also can sinter tile substructure body butt joint into a complete bearing then more than two.In the present embodiment, before butt joint, therefore substructure body 30a, 30b inner arc surface have enough pressure to produce the groove processing space directly in the face of outside, so can make diversified pressure and produce groove.

More than be to be that example is introduced specific implementation method of the present invention with the Hydrodynamic bearing, be appreciated that the present invention also can be applicable on the hydrostatic fluid bearing.

Claims (12)

1. a FDB manufacture method comprises the steps:

The a plurality of substructure bodies that constitute this FDB are provided, and described substructure body is formed with the interface that mutually combines with other substructure bodies, and is formed with partial pressure generation groove on the substructure body;

Described substructure body by its interface butt joint, is begun to take shape the shape of FDB; And

The FDB that the described substructure body of sintering makes it to become one.

2. FDB manufacture method as claimed in claim 1 is characterized in that: the interface of described substructure body is stepped.

3. FDB manufacture method as claimed in claim 1 or 2 is characterized in that: when butt joint, two relative interfaces utilize binder to bind.

4. FDB manufacture method as claimed in claim 1 is characterized in that: provide in the step of substructure body, it is moulding simultaneously that described substructure body and partial pressure thereof produce groove.

5. FDB manufacture method as claimed in claim 1 is characterized in that: providing in the step of substructure body, is each substructure body of first moulding, and the partial pressure of each substructure body of moulding produces groove then.

6. FDB manufacture method as claimed in claim 1 is characterized in that: described FDB is a Cylindrical object, and described substructure body forms interface in relative axial end.

7. FDB manufacture method as claimed in claim 6 is characterized in that: described partial pressure produces groove and is formed on each substructure end of body.

8. as claim 6 or 7 described FDB manufacture methodes, it is characterized in that: the pressure of described FDB produce groove comprise along its inner circumference direction be provided with some to conduit in a certain angle, described partial pressure produces groove and comprises that each is to one of them of conduit.

9. FDB manufacture method as claimed in claim 8 is characterized in that: each joins at the interface place to conduit, thereby " V " type of formation pressure produces groove.

10. FDB manufacture method as claimed in claim 8, it is characterized in that: the mould of the described substructure body of moulding comprise one with the substructure body in the corresponding male model of hole shape, form on this male model should partial pressure producing the single rotation direction projection of groove, adopt the rotation mode demoulding during demoulding.

11. FDB manufacture method as claimed in claim 1 is characterized in that: described FDB is a Cylindrical object, and described substructure body forms described interface in the circumferencial direction both sides.

12. FDB manufacture method as claimed in claim 1, it is characterized in that: the pressure of described FDB produce groove comprise along it whole in Zhou Fangxiang be provided with some to conduit in a certain angle, this partial pressure produces groove system and comprises that Zhou Fangxiang's in the part is some to conduit.

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