TW201632372A - Texturing processing method of sliding member and sliding member - Google Patents

Abstract

The present invention provides a texture processing method which is capable of using a novel method to form a texture pattern with excellent accuracy of shape . The method is to use a scribing wheel 11, which is formed a cutting tip along the outer peripheral ridge line, to make the cutting tip roll on the sliding surface while pressing the cutting tip of the scribing wheel 11 against the sliding surface of the processed sliding member 3, so that the texture pattern can be produced by using the roller calendering to generate plastic deformations for forming fine rolling traces of grooves 10, 10', 10" on the sliding surface.

Description

Texture processing method of sliding member and sliding member

The present invention relates to a texture processing method and a sliding member for a sliding surface of a sliding member. Generally speaking, "texture" refers to the concept of the texture or feel of the surface of a substance. In the present invention, the control of the surface shape of the substance is referred to as texturing, and the surface shape controlled by the texturing is referred to as a texture pattern. Further, a process for processing a sliding surface or the like into a surface shape such as a groove, a recess (depression), or a concavity is referred to as a texture process.

As elements constituting the mechanical parts, there are parts such as pistons, cylinders, valve guides, crankshaft necks that are required to reduce friction, and parts requiring friction resistance such as brakes and clutches. Their common requirement is to suppress ablation and slippage caused by sudden increase in friction.

As one of the methods for reducing the sliding and stabilizing it, it is known that the texturing is effective in forming a texture pattern such as a fine groove or a recess which exhibits an oil collecting function on the sliding surface, and such a method has been conventionally used. For this texturing, for example, a machining method by cutting as shown in Patent Document 1, a chemical processing method by etching as shown in Patent Document 2, or, for example, Patent Document 3 is known. An optical processing method performed by irradiating a laser. Further, in the case where the friction is increased to stabilize it, it is still effective to impart a texture such as a hole or a groove observed in a commercially available brake disk.

In the above-described texturing processing method, there is a limit in the processing by cutting to perform high-precision processing on fine grooves or recesses. Further, since chips are generated during the cutting process and must be removed from the burrs generated in the portion where the chips are cut, it is necessary to add a polishing process step after the cutting process. This type of post-processing step is also required in laser processing. Step. Further, in the etching process, since the component is immersed in the etching liquid, it is necessary to sufficiently perform the cleaning in the subsequent step.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2006-9846

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2012-233593

[Patent Document 3] Japanese Patent No. 4111045

Further, in the etching process, it is necessary to use a patterning process (pretreatment) such as a mask or a post-patterning process, and it takes a lot of work, and it is necessary to etch a dedicated drafting device or a waste liquid processing device. Wait.

Therefore, to date, in order to carry out fine texturing, it is considered that the best method is laser processing. However, in the laser processing, there is a problem in that when the sliding surface of the metal base material is irradiated with a laser to form a fine groove or a recess, the metal vapor or the molten metal which is evaporated by the laser is in the groove or the recess. The vicinity of the edge is cooled, and adheres again and solidifies in the vicinity of the periphery of the groove or the recess 16 as shown in Fig. 9(a) to form a so-called chip 17. This chip 17 has a drawback of adversely affecting the slidability due to adhesion to the surface of the base material.

Therefore, the generated chips must be removed by grinding, so that in addition to the laser irradiation step, the steps of grinding and removing the chips and cleaning the metal powder generated by the grinding are newly required, resulting in an increase in the number of steps. Also, there is a flaw in the portion of the texture pattern that is damaged when the debris is removed during the grinding step.

In order to suppress the generation of the chips at the time of the above-described laser irradiation, Patent Document 3 discloses a method of performing laser processing while flowing a lubricating oil having a laser permeability on the surface of the metal base material. In this method, since the surface of the metal base material is subjected to laser irradiation while flowing the lubricating oil, the generated metal vapor is instantaneously cooled and condensed in the lubricating oil. Solid and flowing, compared with FIG. 9(a), it is possible to suppress the formation of fragments near the groove or the recess 16 as shown in FIG. 9(b) ( FIGS. 9( a ) and ( b ) both refer to Patent Document 3 Figure 4 (B), Figure 5 (B)).

However, in this method, since laser processing is performed while flowing the lubricating oil on one side, the device becomes complicated, and the groove or the recess formed is caused by the interference with the laser light as compared with the case of directly performing the laser irradiation. The problem of reduced shape accuracy is not only the case, but also the use of the used lubricating oil.

Therefore, in the etching process or the laser process, there are problems such as dimensional accuracy and reproducibility of the groove or recess to be processed, processing cost, processing time, and the like, and it cannot be established as a texture processing method.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a texture processing method and a sliding member capable of forming a texture pattern excellent in shape accuracy on a sliding member by a novel method which is completely different from the prior method.

In order to solve the above problems, the following technical means have been conceived in the present invention. That is, the texture processing method of the sliding member according to the present invention uses the scribe wheel in which the blade edge is formed along the outer peripheral ridge line, and presses the blade edge of the scriber wheel against the sliding surface of the sliding member of the workpiece. The blade edge rolls on the sliding surface to cause plastic deformation of the sliding surface caused by the calendering of the roller, and a rolling trace of the fine groove is formed on the sliding surface, thereby processing the texture pattern. Here, the term "plastic deformation by roll calendering" means that the material itself is made of the material to be processed by pressing the roll against a workpiece (such as metal) and rolling it. Ductility smoothes the surface so that no plastic or chipping occurs during plastic deformation. In the present invention, calendering and groove formation are performed together by using a scribing wheel having a sharp cutting edge as a roller.

Further, for example, the groove can be formed by "plastic deformation due to cutting processing" in Patent Document 1, but the difference from "plastic deformation by roller calendering" is that when using a cutting process One side of the workpiece is used as a powder or cut The chips are peeled off and plastically deformed. The groove formed by the smoothing of the roll calendering has a very small height of the protrusion formed at the edge of the formed groove as compared with the groove formed by cutting, and the protrusion can be set to a fixed height. It can be made into a groove of a desired shape of the groove formed on the sliding surface. Also, the effect of hardening the surface by calendering occurs.

In general, a scribing wheel having a sharp cutting edge formed along an outer peripheral ridge line is used to preliminarily engrave a scribing object for specifying a direction in which a crack travels when a brittle material substrate such as a glass substrate is cut. In this way, the processing of breaking the substrate by the cracking is a processing technique peculiar to the brittle material. Therefore, in the breaking process of the metal which is not broken by the crack travel, the scoring wheel has not been used so far. Further, the calendering process for finishing a metal into a smooth surface is essentially a processing method in which a calendering tool that finishes a contact surface with a workpiece into a smooth surface is pressed, so that the calendering process is performed. The paddle with a sharp tip is not used in the tool.

The present invention performs texturing by a novel method, that is, a scribing wheel for scribing a brittle material is used for a workpiece such as a metal exhibiting ductility and ductility. In addition to the metal, the workpiece to be a sliding member may be a LTCC (Low Temperature Co-fired Ceramic) substrate before sintering (a green sheet which can be deformed by pressing). material.

The groove depth of the groove formed by the rolling of the scoring wheel is preferably 1 to 6 μm, and the groove width is preferably set to be in the range of 0.1 to 0.4 mm. Moreover, the pressing force of the scoring wheel on the sliding surface should be 0.1~10N, and the rolling speed should be set to 0.1~2m/s. These numerical values are appropriately selected depending on the kind or material of the sliding member to be processed. Further, the texture of any shape can be imparted by adjusting the pressing load and the shape of the wheel.

The above-mentioned scoring wheel is preferably formed of a material harder than a material of a sliding member as a workpiece (for example, superhard alloy or sintered diamond), and has a diameter of 1.0 to 3.0 mm, a thickness of 0.4 to 1.2 mm, and a tip angle of 90. ~150°, and the tip end of the tip is formed in an arc. Thereby, a groove of a continuous line can be formed as a rolling mark.

Further, by using the grooved scribing wheel in which the concave portion and the convex portion are continuously formed over the entire circumference of the ridge portion which is the blade edge, a discontinuous line or a dot groove is formed on the sliding surface as a rolling mark. Preferably, the grooved scribing wheel has a length of 50 to 100 μm, a length of the convex portion is 30 to 100 μm, and a cutting edge angle of 90 to 150°, preferably 100 to 150°, and the tip end of the cutting edge is formed to have a curvature. .

According to the present invention, the scoring wheel is rolled on the sliding surface while pressing the scoring wheel against the sliding surface of the sliding member, thereby causing plastic deformation due to the rolling of the roller to form a continuous line or a discontinuous line or The slot of the point serves as a scroll mark. Therefore, it is possible to extremely accurately and easily form a groove width or a groove pitch of a micron size. Further, a hardening action by calendering can be obtained on the surface of the groove formed, and the surface of the groove can be, for example, a smooth surface after surface finishing, and a texture pattern excellent in shape accuracy can be processed on the sliding surface.

Moreover, there is no need for complicated attachment equipment as in the prior etching processing or laser processing, and it is only necessary to press the scribing wheel on the sliding surface while moving the scribing wheel relative to the sliding surface, so that it is simple The device can be used and can reduce the total cost and running cost. Further, the material of the sliding member to be processed can be processed by a material that can be plastically deformed by calendering by pressing the scoring wheel, and thus can be applied to various metal materials or before sintering. A ceramic in the form of a sheet can greatly alleviate various effects such as restrictions on the material to be processed.

1‧‧‧ bearing components

2‧‧‧Support rotation axis

3‧‧‧Sliding bearings (sliding members)

3a‧‧‧ Bearing metal

3b‧‧‧ bearing metal

4‧‧‧ bearing retaining body

4a‧‧‧ upper holder

4b‧‧‧ lower holding body

5‧‧‧Link bolt

6‧‧‧ bearing mounting surface

7‧‧‧Lubricating oil supply hole

8‧‧‧Lubricating oil supply tank

9‧‧‧Lubricating oil supply path

10‧‧‧ slots

10'‧‧‧Intermittent linear grooves

10"‧‧‧ intermittent dot-shaped groove

11‧‧‧The marking wheel

11'‧‧‧Slotted wheel

12‧‧‧ Keeper

13‧‧‧rails

14‧‧‧Scratch

15‧‧‧ fixture

16‧‧‧ slots or recesses

17‧‧‧Shards

18‧‧‧ recess

19‧‧‧ convex

C‧‧‧Arc Center

D‧‧‧diameter

H‧‧‧ Depth

L‧‧‧ slot width

P‧‧‧ slot spacing

S1‧‧‧ length

S2‧‧‧ length

W‧‧‧thickness

‧‧‧‧knife angle

Fig. 1 is an exploded perspective view showing a bearing member exemplified as one of the objects to be processed of the present invention.

Fig. 2 is a cross-sectional view showing a state in which a rotating shaft of the bearing member shown in Fig. 1 is supported.

Figure 3 is a front elevational view of a scribe wheel used in the present invention.

Figure 4 is a front view of the portion of the head that holds the score wheel.

5(a) and 5(b) are views showing an example of a processing method using a groove processing jig.

Fig. 6 is an enlarged cross-sectional view showing the sliding surface after the groove processing.

7(a) and 7(b) are plan views showing another embodiment of the groove processing of the sliding surface.

Figure 8 (a), (b) is a front view and a partial enlarged view of the grooved scribing wheel.

9(a) and 9(b) are enlarged cross-sectional views of the grooves processed by laser irradiation.

Fig. 10 is a photomicrograph showing the shape of the tip end of the dicing wheel of another scribe wheel according to another embodiment of the present invention.

Figure 11 is a photomicrograph showing the dent formed by the scribe wheel of Figure 10.

Hereinafter, the texture processing method of the present invention will be described in detail based on the drawings. Here, a case where texture processing is performed on a sliding surface of a sliding bearing that supports a rotating shaft of a crankshaft of an engine will be described as an example.

Fig. 1 is a schematic exploded perspective view showing a bearing member in which a sliding bearing to be processed according to the present invention is incorporated, and Fig. 2 is a cross-sectional view showing a state in which a rotating shaft is supported. In the bearing member 1 shown in the present embodiment, the sliding bearing 3 that serves as the sliding member that supports the rotating shaft 2 is held by the bearing holding body 4.

The bearing holding body 4 is formed by the upper holding body 4a and the lower holding body 4b, and is coupled by a joint bolt 5. A bearing mounting surface 6 formed of a concave curved surface having a substantially semi-cylindrical shape is provided on the inner surface of the upper holding body 4a and the lower holding body 4b facing each other. A sliding bearing 3 that supports the rotating shaft 2 is attached to the bearing mounting faces 6, 6.

The sliding bearing 3 is composed of a pair of bearing metals 3a and 3b which are divided into two parts and have a semi-cylindrical shape. The bearing metal 3a, 3b supports at least the bearing surface of the rotating shaft 2, that is, the sliding surface, and is formed of a metal material such as aluminum alloy. Further, a lubricating oil supply hole 7 is provided on the sliding surface, and the lubricating oil supply hole 7 communicates with the lubricating oil supply groove 8 formed on the bearing mounting surface 6 of the bearing holding body 4. The lubricating oil is supplied to the lubricating oil supply tank 8 via the lubricating oil supply path 9 formed on the bearing holding body 4 from the outside, and the lubricating oil flows from the lubricating oil supply hole 7 to the sliding surfaces of the bearing metals 3a and 3b.

Further, a plurality of fine grooves 10 along the circumferential direction of the rotary shaft 2 are formed in parallel in substantially the entire area of the bearing surfaces of the bearing metals 3a and 3b. The area of the fine groove 10 is a texture pattern that exhibits an oil accumulation function. The texture processing method of the present invention will be described below.

In the texture processing method of the present invention, the scribing wheel 11 having the blade edge at the outer peripheral ridge portion as shown in Fig. 3 is used. The scribing wheel 11 is formed of a hard metal material such as a cemented carbide or a carbon-based material such as sintered diamond, and has a diameter D of 1.0 to 3.0 mm, a thickness W of 0.4 to 1.2 mm, and a cutting edge angle α of 90 to 150°. Further, the tip end of the blade tip is preferably formed to have a curvature.

As shown in FIG. 4, the scoring wheel 11 is rotatably held by the holder 12, and the holder 12 is assembled so as to be movable up and down by the scribing head 14, which is capable of being guided along a linear guide. 13 mobile way to install. The upper and lower movement of the retainer 12 is performed by a hydraulic cylinder (not shown) incorporated in the scribing head 14, whereby the scoring wheel 11 can be pressed against the bearing metal 3a, 3b with the set pressing force. On the surface.

In the present invention, by pressing the scribing wheel 11 against the sliding surfaces of the bearing metals 3a and 3b, the scribing wheel 11 and the sliding surface are relatively moved, and the sliding surface is plastically deformed by calendering. A rolling trace of the fine grooves is formed, thereby forming a texture pattern. That is, no powder or chips are generated from the machined portion (by non-cutting), but a texture pattern is formed by the plastic deformation of the material itself.

Here, FIG. 5 is a view showing an example of a processing method of using a jig in processing a groove. The jig 15 is prepared, and the jig 15 holds the bearing metal 3a (or 3b) and repeatedly swings with the arc center C of the sliding surface of the concave curved surface of the bearing metal 3a as a fulcrum. As shown in Fig. 5(a), the jig 15 is swung counterclockwise to the position of Fig. 5(b) in a state where the scribing wheel 11 is pressed against the side of the sliding surface, thereby forming the sliding surface. The groove 10 in the circumferential direction of the circular arc serves as a rolling trace of the scoring wheel 11. Then, at the position of Fig. 5 (b), the scribing wheel 11 is moved by 1 pitch in the groove width direction, and the jig 15 is swung clockwise to machine a groove parallel to the previously processed groove. Hereinafter, a texture pattern formed of a plurality of fine grooves 10 as shown in Fig. 1 is formed on the sliding surfaces of the bearing metals 3a, 3b by repeating the same steps.

As shown in Fig. 6, the depth H of the groove 10 formed on the sliding surfaces of the bearing metals 3a, 3b is preferably 1 to 6 μm, and the groove width L is preferably 0.1 to 0.4 mm. Further, the groove pitch P is preferably set to 0.1 to 0.5 mm. Moreover, the pressing force of the scribing wheel 11 on the sliding surface is preferably 0.1 to 10 N, and the rolling speed is preferably set to 0.5 to 2 m/s. In addition, these numerical values are suitably selected according to the kind or material of the sliding member to be processed.

The depth H of the groove 10 can be easily adjusted to a desired value by mainly changing the tip shape or pressing force of the scoring wheel 11. Further, the groove width L can be adjusted by mainly changing the size of the scribing wheel 11 used or the cutting edge angle.

In the case of the present embodiment, the scribing wheel 11 having a diameter D of 1.5 mm, a thickness W of 1 mm, and a cutting edge angle α of 150° is used to slide the aluminum alloy at a pressing force of 5 N and a rolling speed of 1 m/s. The surface was processed, and as a result, a groove having a groove depth H of 3 μm and a groove width L of 0.2 μm was machined. The groove 10 formed in this manner can sufficiently function as a deposit.

As described above, the scribing wheel 11 is rolled on the sliding surface while pressing the scoring wheel 11 against the sliding surface, thereby forming the fine groove 10 as a rolling mark. Therefore, even a groove processing having a groove width L or a groove pitch P which is extremely fine micron-sized can be easily formed. Further, the surface of the groove formed can be formed into a smooth surface which is processed by, for example, a previous calendering tool (a tool for performing mirror polishing by rubbing a surface of a workpiece with a pressing member such as a roller), and the shape can be processed. Texture pattern with excellent precision. In this case, the effect of the calendering tool can be improved by forming the tip end of the cutting wheel 11 into a slight arc. Moreover, there is no need for complicated attachment equipment as in the prior etching processing or laser processing, and it is only necessary to press the scribing wheel 11 against the sliding surface while moving the scribing wheel and the sliding surface relatively, so that the utility model can be utilized simply. The device is processed to suppress processing costs. Moreover, since the material of the sliding member to be processed is a material that can be plastically deformed by pressing the scoring wheel 11, the processing can be performed, and therefore, it can be applied to various metal materials, and the limitation of the material to be processed can be greatly alleviated.

Furthermore, in the case where the material of the sliding bearing (sliding member) 3 is ceramic, as long as The ceramic material (green sheet state) before sintering can be processed by the above method. Thereby, even if it is a brittle material and the ceramic of high hardness, the groove 10 can be formed easily by plastic deformation by non-cutting.

In the above embodiment, the groove 10 formed by the rolling of the scoring wheel 11 is formed in a continuous line shape, but may be processed into, for example, a discontinuous linear groove 10' as shown in Fig. 7(a). Or, for example, the dot-shaped groove 10" shown in Fig. 7(b). In this case, as the scribe wheel for machining the groove 10' or the groove 10", for example, the grooved scribe wheel 11 shown in Fig. 8 is used. The grooved scribe wheel 11' is formed by providing a notch at a fixed pitch over the entire circumference of the ridge line, thereby forming a continuous concave portion 18 and a convex portion 19 substantially becoming a cutting edge. As such a grooved scribing wheel 11', for example, a scribe wheel "Penett" (registered trademark) manufactured by Samsung DIAMOND Co., Ltd., which is used for glass breaking, can be used.

The grooved scoring wheel 11' is made of superhard alloy or sintered diamond as a material, and has a diameter of 1.0 to 3.0 mm, a cutting edge angle α of 90 to 150°, and a tip end of the cutting edge is formed as With curvature. Further, the length S1 of the concave portion 18 is preferably 50 to 100 μm, and the length S2 of the convex portion 19 is preferably 30 to 100 μm.

Therefore, the groove 10' or 10" which is an intermittent line or point of the sliding surface formed by the rolling marks of the grooved scribing wheel 11' is spaced apart from the length of the recess 18 corresponding to the grooved scoring wheel 11'. The shape is formed at intervals, and the shape is also formed to correspond to the size of the convex portion 19. By thus forming the independent lines or dots intermittently, the function as the oil accumulation can be further improved.

The sliding surface of the sliding member processed in the above manner can be hardened by calendering, and can be, for example, a smooth surface after surface finishing, and can be formed by a line or a point groove that exhibits an oil accumulation function. A smooth sliding is achieved to obtain an excellent sliding member.

Further, Fig. 10 is a photomicrograph of the tip end portion of the grooved scribing wheel which is suitable for the construction of the present invention. The edge of the convex portion is rounded as compared with the grooved scoring wheel 11' for glass division shown in Fig. 8, and the convex portion and the concave portion are smoothly connected. Figure 11 shows the use of this A photomicrograph of the dent when the scribe wheel is rolled over the glass. In this case, a dent of a dent circle formed by the scribe wheel shown in Fig. 7 is formed.

The representative embodiments of the present invention have been described above, but the present invention is not necessarily limited to the above embodiments. For example, in the above embodiment, the bearing metals 3a, 3b as workpieces are moved relative to the scoring wheels 11, 11' in order to machine the grooves 10, 10', 10", but the scoring wheels 11, 11' moves along the sliding surfaces of the bearing metals 3a and 3b. Further, the sliding member to be processed in the present invention is not limited to the above bearing members, and can be applied to a piston or a cylinder such as an engine, and a valve-like reciprocating device. The texture processing of the sliding surface of the sliding member can be appropriately modified or changed within the scope of the invention without departing from the scope of the invention.

[Industrial availability]

The present invention can be applied to texture processing of a sliding surface of a bearing member such as a piston or a cylinder, a valve-like reciprocating sliding member, or a rotating shaft that supports a crankshaft or the like.

3a‧‧‧ Bearing metal

3b‧‧‧ bearing metal

11‧‧‧The marking wheel

12‧‧‧ Keeper

13‧‧‧rails

14‧‧‧Scratch

Claims (11)

A method for processing a texture of a sliding member, which uses a scribe wheel having a blade edge along a peripheral ridge line to press the blade edge of the scriber wheel against a sliding surface of a sliding member of a workpiece Rolling on the sliding surface causes the sliding surface to be plastically deformed by the calendering of the roller, and a rolling trace of the fine groove is formed on the sliding surface, thereby processing the texture pattern. A texture processing method of a sliding member according to claim 1, wherein the groove formed by the rolling of the scoring wheel is formed in a continuous line. The texture processing method of the sliding member of claim 1, wherein the groove formed by the rolling of the scoring wheel is formed in a discontinuous line. A method of texture processing of a sliding member according to claim 1, wherein the groove formed by the rolling of the scoring wheel is formed at a discontinuous point. The texture processing method of the sliding member according to any one of claims 1 to 4, wherein the groove formed by the rolling of the scoring wheel has a depth of 1 to 6 μm and a groove width of 0.1 to 0.4 mm. The method for processing a sliding member according to claim 2, wherein the scribed wheel forming the groove of the continuous line is formed of super hard alloy or sintered diamond, and the diameter is formed to be 1.0 to 3.0 mm, and the cutting edge angle is 90 to 150°. And the tip end of the tip is formed in an arc. The texture processing method of the sliding member of claim 3 or 4, wherein the scriber wheel forming the intermittent line or the groove of the point is a grooved scribe wheel formed of super hard alloy or sintered diamond, having a diameter of 1.0 ~3.0 mm, and a concave portion and a convex portion are continuously formed on the entire circumference of the ridge line portion which becomes the cutting edge. The method for processing a texture of a sliding member according to claim 7, wherein the grooved scribing wheel has a length of the concave portion of 50 to 100 μm and a length of the convex portion of 30 to 100 μm. The tip angle is 90 to 150°, and the tip end of the tip is formed in an arc. A sliding member having a sliding surface that is pressed by a grooved scribing wheel provided with a concave portion and a convex portion on an entire circumference of a peripheral ridge line which is a blade edge, and the grooved groove is The sliding surface is rolled, and the sliding surface forms a plurality of intermittent lines or points of grooves caused by plastic deformation, and the grooves are formed at a depth capable of retaining the lubricant. The sliding member of claim 9, wherein the material of the sliding surface of the sliding member is metal. The sliding member according to claim 9, wherein the material of the sliding surface of the sliding member is a ceramic before sintering.