JPH0737084B2 - V-ribbed belt manufacturing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a V-ribbed belt, and more specifically, a rotating grinding wheel is brought into contact with a running vulcanization sleeve to suppress heat generation on the surface of the vulcanization sleeve to accurately form grooves. The present invention relates to a method for manufacturing a V-ribbed belt obtained by polishing a groove.

[0002]

2. Description of the Related Art A conventional V-ribbed belt is obtained by vulcanizing a reverse molded body obtained by laminating canvas, an upper rubber layer, a tensile member and a lower rubber layer on a mandrel as shown in Japanese Patent Publication No. 5217552. The obtained vulcanizing sleeve was manufactured by a grinder method in which a plurality of V-shaped grooves were ground by a grinding wheel in which a cylindrical surface portion and a portion having a plurality of V-shaped grooves were connected and integrated.

Recently, in a long V-ribbed belt, a vulcanized belt sleeve is hung on a driving roll and a driven roll to run, and a surface of the running belt sleeve is ground into a V groove by a grinding wheel. Being manufactured. The grinding wheel used here has a polishing portion extending in a relatively circumferential direction between slits extending in the width direction at regular intervals in the circumferential direction. This polishing portion had convex portions having a triangular cross section along the width direction at regular intervals, and diamond was attached to the surface thereof.

[0004]

However, in the conventional grinding wheel, since the length of the polishing portion along the circumferential direction is large, when the belt sleeve is processed, a large amount of heat is generated in the sleeve and vulcanization reversion occurs. Therefore, there is a problem in that it cannot be machined with high precision, and the power consumption during processing is large. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to reduce the heat generation with a low load and to perform the polishing processing of the back surface of the belt quickly and accurately.

[0005]

That is, the feature of the present invention which meets the above object is that a cylindrical vulcanizing sleeve having a core wire embedded in a rubber layer is hung on a driving roll and a driven roll. In the method for manufacturing a V-ribbed belt, which comprises running the vulcanized sleeve under running tension with a rotating grinding wheel in contact with the vulcanized sleeve and polishing the groove portion on the surface of the vulcanized sleeve, The surface is provided with a polishing portion protruding at a constant pitch along the circumferential direction and a groove-shaped slit portion located between the polishing portions, and rib portions and concave portions are alternately arranged along the width direction of the polishing portion. In the method for manufacturing a V-ribbed belt, at least the rib portion of the polishing portion, the surface of the concave portion and the edges of the rib portion are attached with the granular material.

[0006]

In the method of manufacturing a V-ribbed belt according to the present invention, a grinding wheel is provided with a polishing portion protruding at a constant pitch along the circumferential direction on the surface and a groove-like slit portion located between the polishing portions. , The ribs and the recesses are alternately arranged along the width direction of the polishing part, and at least the ribs of the polishing part, the surface of the recesses and the edges of the ribs are attached with the granular material. Since the edge of the part and the area in the vicinity thereof mainly have a function of grinding the belt, the length of the polishing part can be made extremely short,
The rotation load of the grinding wheel can be reduced to suppress the heat generation of the belt, and accurate processing can be performed. Further, the groove-shaped slit portion provided between the polishing portions serves as a region for temporarily releasing the stress applied to the surface to be ground of the belt during processing and restoring the deformation. As a result, the surface to be ground is processed again in the polishing section without leaving any distortion, which enables highly accurate grinding of the rib section.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a partial cross-sectional view of a belt sleeve used in the present invention, in which one or a plurality of cover canvases 2 are wound around the peripheral surface of a cylindrical molding drum 1 to form a tensile layer 3.
Next, the cushion rubber layer 4, the core wire 5 made of a rope spirally wound around the cushion rubber layer 4, and the compression rubber layer 6
Are sequentially laminated. This laminate is vulcanized and vulcanized sleeve
It becomes 8 . The compressed rubber layer 6 is made of aramid fiber, polyester fiber, nylon fiber, cotton or the like and has a length of 1 to 10
1 to 15 vol% of cut fibers of mm are mixed and arranged in the width direction of the vulcanization sleeve.

Next, as shown in FIG. 2, the vulcanization sleeve 8 is hung on the driving roll 10 and the driven roll 11 so that the compression rubber layer 6 is located on the surface side, and is run under a predetermined tension. The traveling speed of the vulcanization sleeve 8 is not particularly limited. The further rotated grinding wheel 12 is arranged on the side of the driving roll 10 or the driven roll 11, and is moved so as to come into contact with the vulcanization sleeve 8 which is running, so that the surface of the vulcanization sleeve 8 is removed.
A plurality of -100 groove portions 9 are polished at one time. The rotation direction of the grinding wheel 12 may be the same as or opposite to that of the vulcanization sleeve 8. This grinding wheel 12
The number of rotations is 400 to 2,000 rpm .

The grinding wheel 12 used here is shown in FIG.
As shown in FIG. 9, polishing portions 15 protruding alternately at a constant pitch L along the circumferential direction are alternately provided.
5 is a width direction and a rib portion 16 having a triangular cross section at a constant pitch along an oblique direction with respect to the rotation axis of the grinding wheel 12.
And concave portions 17 are alternately provided. The surface of the rib portion 16 and the concave portion 17 is made of diamond or the like,
The 120 mesh granular material 27 is attached, but at the same time, it is also attached to the tip end surface 19 including the edge 18 in the rib portion 16 of the polishing portion 15, that is, the surface contacting the vulcanization sleeve 8. In the present invention, the polishing section 15 may be parallel to the rotation axis. The groove-shaped slit portion 21 provided between the polishing portions 15 is a region for temporarily releasing the stress applied to the surface to be ground of the vulcanization sleeve during processing and restoring the deformation. As a result, the surface to be ground is processed again by the polishing section 15 without leaving any distortion, enabling highly accurate grinding. For this reason, it is preferable that the number of slits 21 is large.

The circumferential length P of each polishing portion 15 corresponds to about 10 to 50% of the pitch length L (L = P + D) of the polishing portion 15. If it exceeds 50%, the rotational load of the grinding wheel is gradually increased and the vulcanization sleeve 8 is likely to generate heat, and high-speed rotation cannot be expected to perform accurate machining. On the other hand, when it is less than 10, the rotational load of the grinding wheel does not decrease so much, and the polishing area is rather reduced, which causes a problem that machining time is required. The most preferable range of the circumferential length of the polishing section 15 is about 30 to 40% of the pitch length L of the polishing section 15. The circumferential length D of the slit portion 21 is 90 times the pitch length L of the polishing portion 15.
This corresponds to about 50%, which allows the stress received by the surface to be ground to be released once, and a margin to restore the deformation can be provided.

FIG. 9 shows another shape of the polishing section 15. The tip surface 19 of the rib section 16 of the polishing section 15 is inclined to increase the occupied area. This has the effect of increasing the amount of particulate matter 27 adhering to the vicinity of the edge 18 and extending the life of the polishing section 15.

Inside the grinding wheel 12, fluid passages 28 are provided in the vicinity of the outer peripheral portion at regular intervals along the circumferential direction, but cap bodies 23, 23 are provided on both side portions of the wheel 12. By installing the fluid passage 2
8 communicates. A housing portion 30 into which the shaft 25 is fitted is provided inside the wheel 12. This housing section 30
The shaft 25 fitted into the grinding wheel 12 has a plurality of fluid passages 29 for axially supplying a cooling medium such as water into the grinding wheel 12.
have. That is, the cooling medium is the inflow passage 2 of the shaft.
9 through the pipe 20 to the inlet 31, from the inlet 31 to the fluid passage 32, and after circulating in the grinding wheel 12, to the outlet (not shown) and from the outlet to the outlet passage in the shaft. It is discharged to the outside through 32. As a result, the cooling medium circulates in the grinding wheel 12 and cools the polishing section 15 that has generated heat during processing.

When the rotating grinding wheel 12 comes into contact with the running vulcanization sleeve 8, the edge 18 having the particulate matter 27 and the polishing portion 15 having a short circumference bite into the vulcanization sleeve 8 to cut it. After that, the slit portion 21 once releases the stress applied to the surface to be ground of the vulcanization sleeve 8 to restore the deformation, so that the rotational load at this time becomes small and the vulcanization sleeve 8 generates a large amount of heat. And the surface to be ground is processed again in the polishing section 15 without leaving any distortion,
Enables highly accurate grinding. Therefore, the grinding wheel 1
No. 2 has a low load, and the vulcanization sleeve 8 can be ground quickly and accurately. The vulcanization sleeve 8 thus obtained is removed from the drive roll 10 and the driven roll 11, the vulcanization sleeve 8 is hung on the other drive roll and the driven roll and run, and cut into a predetermined width by a cutter. Then, the V-ribbed belt 7 shown in FIG. 3 can be finished. Cut fibers project from the surface of the belt 7 that is in contact with the pulley.

Hereinafter, the results of comparison of the power consumption when the V-ribbed belt of the present invention is manufactured and the conventional manufacturing method are used will be described below. First, in the vulcanizing sleeve 8 used in the method for manufacturing a V-ribbed belt of the present invention, the cover canvas 2 is a plain woven fabric in which both warp yarns and weft yarns are made of cotton yarn. 1 ply of elastic woven fabric, chloroprene rubber as the cushion rubber layer 4, rope made of polyester fiber as the core wire, chloroprene rubber as the compression rubber layer 6 with 8 vol% nylon fiber 8 vol% and length 3 mm aramid fiber 3 vol
% Cut yarns arranged in the width direction of the sleeve and mixed were used. The method of manufacturing vulcanized sleeve 8, the cover canvas 2 on the peripheral surface of the forming drum 1 as shown in FIG. 1, succumbed
The rubber layer 4 is laminated, and the rope is formed on the same layer 4.
The core wire 5 is spirally wound, and then the compression rubber layer 6 is sequentially wound.
It is obtained by laminated molding, so-called reverse molding.

As shown in FIG. 2, the vulcanizing sleeve 8 is hung on a driving roll 10 and a driven roll 11 and run under a predetermined tension. At the same time, the grinding wheel 12 shown in FIG. Then, the vulcanized sleeve 8 was rotated at 1,800 rpm and brought into contact with the vulcanized sleeve 8, and 80 groove portions 9 were polished on the surface at once. The groove 9 had a depth of about 2 mm and the polishing time was 3.5 minutes. The circumferential length P of each polishing section 15 of the grinding wheel used here is determined by the polishing section 1
5 corresponds to about 30% of the pitch length L (L = P + D). The power consumption obtained by this grinding wheel 12 is 0.385 kwh / cycle, the surface temperature of the grinding wheel 12 immediately after polishing is 20 to 35 ° C, while the surface temperature of the vulcanization sleeve 8 is 25 to 35 ° C. Met.

A conventional grinding wheel is used as a comparative example, and the other manufacturing conditions are the same as above. The circumferential length P of the polishing portion of this grinding wheel corresponded to about 80% of the pitch length L (L = P + D) of the polishing portion.
Further, in this grinding wheel, diamond particles are not attached to the tip surface including the edge. As a result, the polishing time is 5 . 8 minutes, the power consumption obtained by this grinding wheel is 1.024 kwh / times, the surface temperature of the grinding wheel immediately after polishing is 30 ~ 55 ° C, while the surface temperature of the vulcanization sleeve is 30 ~ 45 ° C. Met.

[0017] In this way, V-ribbed belt manufacturing method of the present invention, it is possible to ing to short length polishing unit for grinding an edge of the abrasive portion of the grinding wheel and near it.
This is because the vulcanization sleeve can be ground with a small rotation load to suppress the heat generation of the belt, and the vulcanization sleeve can be V-grooved quickly and accurately to finish it into a V-ribbed belt .
You can

[0018]

As described above, according to the method of manufacturing a V-ribbed belt of the present invention, the vulcanization sleeve is ground at the edge of the polishing portion of the grinding wheel and in the vicinity thereof, whereby the length of the polishing portion can be shortened. Therefore, the rotation load of the grinding wheel can be reduced to suppress the heat generation of the vulcanization sleeve, reduce the power consumption, and process quickly and accurately.
Not only this, but also many vulcanization sleeves can be ground, and a V-ribbed belt having a stable surface form can be obtained regardless of the number of times the grinding wheel is used.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a belt sleeve used in the present invention.

FIG. 2 is a front view showing a state where a vulcanizing sleeve is being polished by a grinding wheel.

FIG. 3 is a partial cross-sectional perspective view of a V-ribbed belt.

FIG. 4 is a cross-sectional view of a grinding wheel used in the present invention.

5 is a sectional view taken along line BB of FIG.

6 is a cross-sectional view taken along line CC of FIG.

FIG. 7 is a partial plan view of FIG.

FIG. 8 is a partial perspective view of a polishing portion of a grinding wheel.

9 is an enlarged view of a portion E in FIG.

[Explanation of reference numerals] 1 forming drum 2 canvas 3 tensile layer 4 cushion rubber layer 5 core wire 6 compression rubber layer 7 V-ribbed belt 8 vulcanizing sleeve 9 groove portion 10 driving roll 11 driven roll 12 grinding wheel 15 polishing portion 16 rib portion 17 concave portion 18 edge 19 tip surface 27 granular material

Claims (3)

[Claims] 1. A cylindrical vulcanization sleeve having a core layer embedded in a rubber layer is hung on a driving roll and a driven roll to run under a predetermined tension, and further rotated on the vulcanization sleeve while running. In a method of manufacturing a V-ribbed belt, which comprises abutting a grinding wheel and polishing a groove portion on the surface of a vulcanizing sleeve, a grinding portion which is projected as a grinding wheel at a constant pitch along the circumferential direction on the surface. And a groove-shaped slit portion located between the polishing portions, and rib portions and concave portions are alternately arranged along the width direction of the polishing portion, and at least the rib portions of the polishing portion and the surfaces of the concave portions and the ribs. A method for manufacturing a V-ribbed belt, characterized in that a granular material is attached to an edge of a portion. 2. The length of each polishing portion in the circumferential direction is 10 to 50 of the pitch length L of the polishing portions arranged along the circumferential direction.
%, The method for manufacturing a V-ribbed belt according to claim 1. 3. The method for producing a V-ribbed belt according to claim 1, wherein the particulate matter is also attached to the tip end surface of the rib portion of the polishing portion.