CN1190605C

CN1190605C - Etching method applied to the manufacture of fluid bearings

Info

Publication number: CN1190605C
Application number: CN 02147999
Authority: CN
Inventors: 章广贤; 徐弘光
Original assignee: Industrial Technology Research Institute ITRI
Current assignee: Industrial Technology Research Institute ITRI
Priority date: 2002-11-01
Filing date: 2002-11-01
Publication date: 2005-02-23
Anticipated expiration: 2022-11-01
Also published as: CN1493794A

Abstract

The disclosed technology is an etching method applied to manufacture a fluid bearing; the invention uses a mandrel for spraying as a mask of bearing material, and injects protective material into the inner diameter part of the fluid bearing to generate protective pattern; after the mandrel for spraying is pulled out, the bearing material is etched on the inner diameter part of the mandrel for spraying to form a required oil groove; finally, cleaning the etching solution and removing the protective pattern; the invention is easy to integrate to the existing process, and achieves the effects of mass production and cost reduction; in addition, the invention can avoid the burr problem generated by the prior processing technology and manufacture the radial and thrust parts of the fluid bearing at the same time, thereby generating the effect of simplifying the manufacturing process.

Description

Be applied to make the engraving method of FDB

Technical field

The present invention is a kind of engraving method that is applied to make FDB, particularly about a kind of method of making the oil duct of FDB inner-diameter portion whose.

Background technique

In Machine Design, need make bearing can produce the effect of oil film pressure and oil sealing in the running at the internal diameter design oil duct of bearing during the FDB of making passive type.The inner oil duct of general bearing is to make with the cutting way of tradition processing; But motor now trends towards doing littler and littler, make high-precision small motor and is not easy, and small motor all requires very strict for the concentricity of the degree of depth, width and the bearing bore diameter of oil duct.If make with traditional processing mode of cutting, can produce burr, oil duct concentricity not good, problem such as tool wear and machining tool are made be difficult for.

MAT to develop with Metal Ball and rolls at bearing inner surface in order to address the above problem, and in order to extrude the technology of required oil duct groove mark, it is disclosed in U. S. Patent No. 5758421, and it becomes the major technique of present PANASONIC FDB product.But the method for this kind Metal Ball roll extrusion because the area of contact of Metal Ball and bearing part is little, thereby is easy to generate abrasion.In addition, because the Metal Ball of making oil duct is very little, the jig Design of seizing Metal Ball on both sides by the arms is difficult for, and also needs the control platform of a precision positioning when rolling.

In addition, there is the mode that adopts the plastics reaction-injection moulding to make the technology of FDB, as No. 6074098 disclosed technology of U. S. Patent.It is an elasticity of utilizing plastics itself, the plastic bearing of reaction-injection moulding is directly forced pull out the demoulding.But the rigidity of plastic bearing itself and hardness deficiency have the not shortcoming of abrasion performance.

Summary of the invention

In view of above prior art problems, the object of the present invention is to provide a kind of engraving method that is applied to make FDB, the inner-diameter portion whose that particularly is applied in FDB produces oil duct.The present invention utilizes engraving method to make the oil duct of FDB internal diameter, and quite ripe with the processing procedure of a large amount of manufacturing machine parts of engraving method, just technology now is limited to the part of making planar design more.Therefore the present invention is integrated into the processing procedure of existing machinery part easily, and the effect that reaches a large amount of productions and reduce cost.In addition, the present invention can avoid the burr problem that existing processing technique can produce and make simultaneously FDB radially with the thrust part; Can produce the effect of simplifying processing procedure.

For reaching above-mentioned purpose, a kind of engraving method that is applied to make FDB provided by the present invention, its step includes: at first, provide bearing material cylindraceous, its inner-diameter portion whose has the hollow cylindrical wall; Secondly, provide to spray and use axle, to being positioned at the bearing material and stretching into wherein with its hollow cylindrical wall of fitting, spray with axle and form a plurality of burrs of correspondence in the position that the hollow cylindrical wall waits to portray several oil ducts, its several burrs are close to the hollow cylindrical wall; Between several burrs, inject a protective material of tool flowability, fill up the gap of several burrs and hollow cylindrical wall; Then, make protective material freeze solidly on the hollow cylindrical wall to form several protection patterns; And will spray with axle and extract the bearing material, separation injection several protection patterns of axle and hollow cylindrical wall; The bearing material is inserted etching solution, and the generation of locating that makes the bearing material not cover several protection patterns is etched with several oil ducts of formation; Clean etching solution at last and remove several protection patterns.

Wherein, bearing material of the present invention is made by the metal of abrasion performance; Protective material is a plastic materials.And plastic materials can the reaction-injection moulding mode injects the gap of these several burrs and this hollow cylindrical wall.And the protrusion height of several burrs is that 10 microns (μ m) are to 100 microns (μ m), because its surperficial burr does not help to spray extracting and the demoulding with axle deeply; And part that can the injury protection pattern.The precision of accurate FDB is very important, and the present invention makes a plurality of oil ducts with engraving method, and its etching precision and the degree of depth can be by selecting suitable etching solution and etching period to control.

In addition, use engraving method of the present invention also not have the cutter problem that is difficult for cutter processing easy to wear of traditional mechanical processing; And the difficulty in use Metal Ball rolling finishing precision prescribed and the contraposition.

The invention effect

The engraving method that is applied to make FDB of the present invention can be applicable to make the inside oil duct part of small FDB.Have and be integrated into existing processing procedure easily, and the effect that reaches a large amount of productions and reduce cost.In addition, the present invention not only can avoid the burr problem that existing processing technique can produce and can make simultaneously FDB radially with the thrust part; Can produce the effect of simplifying processing procedure.

Relevant characteristics and implementation of the present invention, conjunction with figs. is described in detail as follows as most preferred embodiment now:

Description of drawings

Fig. 1 to Fig. 8 is the embodiment's fabrication steps schematic representation that is applied to make the engraving method of FDB of the present invention.

Fig. 9 is a schematic perspective view of embodiments of the invention step.

The number in the figure explanation

10 bearing materials

20 injection axles

30 plastic materialss

31 injection molding facility

40 etching baths

Embodiment

Technology disclosed in this invention is the engraving method that is applied to make FDB.The present invention utilizes one to spray with the mask (mask) of axle as the bearing material, and the protective material that reinjects produces the protection pattern in the inner-diameter portion whose of FDB, promptly as the photoresistance pattern part in the photolithographic techniques.Extract and spray with again the bearing material being carried out etching after the axle, to form required oil duct in its inner-diameter portion whose.Clean etching solution at last and remove its protection pattern.

In order to be described in more detail the present invention, following conjunction with figs. describes the fabrication steps of the embodiment of the invention in detail.Please refer to Fig. 1 to Fig. 8, Fig. 1 to Fig. 8 is the embodiment's fabrication steps schematic representation that is applied to make the engraving method of FDB of the present invention.

The fabrication steps of the embodiment of the invention includes: at first, provide bearing material 10 cylindraceous, and as shown in Figure 1, its inner-diameter portion whose is the hollow cylindrical wall.The metallic material of the material selection abrasion performance of bearing material.

The internal diameter of fitted bearing material provides an injection to use axle again, as shown in Figure 2.Spraying with axle 20 needs being positioned at bearing material 10 and stretching into wherein with applying hollow cylindrical wall, injection is with axle 20 and have several burrs, its burr position is the position of waiting to portray several oil ducts corresponding to the hollow cylindrical wall, its several burrs are close to the hollow cylindrical wall, make to spray the mask (mask) that becomes bearing material 10 with axle 20.

Then as shown in Figure 3, again with the mode of injection molding (Injection Molding) internal diameter with the plastic materials 30 injection bearing materials 10 of flowability.The injection molding mode be with plastic materials 30 via the plastic materials 30 of injection molding facility 31 with suitable pressure injection tool flowability between spraying with the internal diameter of several burrs of axle 20 and bearing material 10, fill up the gap of several burrs and hollow cylindrical wall.And because its gap portion is very little, need to use plastic materials 30, could fill up the gap of a plurality of burrs and hollow cylindrical wall smoothly with high fluidity.

Please refer to Fig. 4, with flowable plastic material 30 through suitable pressurize with solidify after, make plastic materials 30 freeze solidly on the hollow cylindrical wall, and cooperate several burrs that spray with axle 20 to form several to protect pattern.

And, use to spray and carry out the action of withdrawing pattern with axle 20, as shown in Figure 5, will spray with axle 20 and extract bearing material 10, separation injection a plurality of protection patterns of axle 20 and hollow cylindrical wall.The burr that sprays with axle 20 surfaces is to protrude about 10 microns (μ m) to 100 microns (μ m), and therefore, the height of its a plurality of protection patterns also drops in the same range as; And, help can not damage its several protection pattern to force the mode that ejects to carry out withdrawing pattern owing to spray with the burr on axle 20 surfaces quite shallowly.

Carry out etching step again; as shown in Figure 6 bearing material 10 is inserted etching bath 40; etching solutions in its etching bath 40 need be enough to cover whole bearing material 10, and do not cover locating to produce to be etched with and forming the required a plurality of oil ducts of FDB of a plurality of protection patterns in bearing material 10.Etching solution need cooperate employed bearing material 10 of the embodiment of the invention and plastic materials 30 to select.

Need carry out a step of cleaning etching solution after etched, as shown in Figure 7, avoid etching solution to continue to carry out etching, influence the mechanical precision and the degree of depth in several oil ducts.The present invention makes several oil ducts with engraving method, and its etching precision and the degree of depth can be by selecting suitable etching solution and etching period to control.

At last, several protection patterns of removing the hollow cylindrical wall just form required finished product, and as shown in Figure 8, mode removes several protection patterns can to use cutting, etching and directly pull out etc.In addition, the present invention system is applied to make FDB, and its injection can be several screw threads with several burrs on the axle.

Though preferred embodiment of the present invention openly as mentioned above; right its is not in order to limit the present invention; anyly have the knack of related art techniques person; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, therefore scope of patent protection of the present invention must be looked the appended claim person of defining of this specification and is as the criterion.

Claims

1. An etching method applied to the manufacture of fluid bearings, the steps of which include:

Provide a bearing material with a hollow cylindrical wall;

providing a mandrel for spraying, aligning the bearing material so as to extend into and fit the hollow cylindrical wall surface, the spraying mandrel has a plurality of corresponding embossments formed at positions where several oil grooves are to be carved on the hollow cylindrical wall surface, And the plurality of raised patterns are closely attached to the hollow cylindrical wall;

A fluid protective material is injected between the plurality of reliefs to fill the gap between the plurality of reliefs and the hollow cylindrical wall;

making the protective material solidify on the hollow cylindrical wall surface to form several protective patterns;

pulling out the spraying mandrel from the bearing material, separating the spraying mandrel from the plurality of protection patterns on the hollow cylindrical wall surface;

Putting the bearing material into an etching solution to etch the parts of the bearing material that do not cover the protection patterns to form the oil grooves;

cleaning the etchant; and

The several protection patterns are removed.

2. The etching method applied to manufacture a fluid bearing according to claim 1, wherein said bearing material is made of a wear-resistant metal.

3. The etching method for manufacturing a fluid bearing according to claim 1, wherein the protective material is a plastic material.

4. The etching method applied to the manufacture of fluid bearings according to claim 3, characterized in that, the plurality of ridges are several screw threads.

5 . The etching method used in manufacturing fluid bearings as claimed in claim 3 , wherein the plastic material is injected into the gap between the plurality of convex lines and the hollow cylindrical wall by spraying. 6 .

6 . The etching method for manufacturing a fluid bearing according to claim 1 , wherein the protrusion height of the plurality of ridges is 10 microns to 100 microns. 7 .

7. The etching method for manufacturing fluid bearings according to claim 1, wherein the etching precision and depth of the plurality of oil grooves are controlled by the etching solution and etching time.