JP2889974B2 - Method for producing V-ribbed belt and grinder wheel used in the 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 a grinder wheel used in the method. Each of these inventions is manufactured by employing a grinding method for a compressed rubber layer constituting a cylindrical body for forming a belt. V-ribbed belt.

[0002]

2. Description of the Related Art A compression rubber layer, a tensile member layer, and a tension layer are sequentially laminated, and a compression rubber layer of a cylindrical body for forming a belt, which is formed by integrating the compression rubber layer, a tensile rubber layer, and a tension layer,
Method of manufacturing V-ribbed belt by grinding with a shaped whetstone
Is known , for example, from JP-A-49-81748 . In the course of this grinding process, a V-shaped grindstone in which the grain size of the abrasive material is changed is used to induce a change in roughness on the V-rib surface of the V-ribbed belt, and specifically, the V-rib comes into contact with the V pulley. A rough polished surface is formed on both side walls of the V-rib, and a fine polished surface is formed on the bottom and the tip of the V-rib. The frictional resistance is low at the time of contact, thereby suppressing the generation of noise and abnormal noise. On the other hand, the adoption of a fine polished surface allows the bottom of the V rib and V
It is possible to suppress the occurrence of cracks from the rib tip portion (see Japanese Utility Model Laid-Open No. 3-28344) .

[0003] First, as a method of manufacturing the first V-ribbed belt using a grinding means, the surface of a V-rib portion is polished with an annular V-shaped grindstone having a small-grain abrasive attached to the surface, and then required. Only the portion is polished again with an annular V-shaped grindstone composed of an abrasive having a large grain size to change the surface roughness of the V-rib portion of the belt.

On the other hand, as a second manufacturing method, conversely, after polishing the surface of a V-rib portion with an annular V-shaped grindstone having a large-grain abrasive attached to the surface, only the necessary portion is re-grained. It is polished with an annular V-shaped grindstone composed of a small abrasive to change the surface roughness of the V-rib portion (see Japanese Patent Application Laid-Open No. 62-113940).

Further, as a third manufacturing method, as shown in FIG. 9, the surface of an annular V-shaped core (43) protruding from the outer peripheral surface of a cylindrical core (42) of a grinder wheel (41) is provided. A coarsely divided area (46) to which a large-grain abrasive (44) is attached and a small-grain abrasive (45)
From the distal end portion of the annular core body (43) and the base portion of the projection to the hem portion, the fine divided regions (47) (4)
7), each area (47), (45), (4)
The step (4) at the boundary of (7) due to the difference in particle size of the granular abrasive
While leaving 8), various finishing surfaces with different roughness are set on the peripheral wall portion of the V-rib portion of the belt in a single grinding process to improve work efficiency.

[0006]

In the first and second manufacturing methods using grinding, a plurality of types of grinder wheels are required, so that the time required for the polishing operation is naturally increased, and the required time for the belt V rib portion is increased. Advanced position control is required so as not to disturb accurate and accurate rib pitch, and due to repeated grinding work, a step is generated between the grinding finish areas on the V-rib surface, and the work efficiency of the V-ribbed belt,
In addition, the appearance is impaired.

In the third manufacturing method by grinding, the abrasive adhered to the surface of the annular V-shaped grindstone inevitably generates a step due to the particle size between the abrasive adhered regions due to the change in the particle size. However, due to this, a step is similarly transferred to the V-rib surface of the V-ribbed belt as the object to be polished, resulting in impairing the work efficiency of the V-ribbed belt and the appearance of the belt itself.

The present invention solves these problems as a whole, and, among other things, is a method of manufacturing a V-ribbed belt by grinding the V-ribbed belt which can prevent a step caused by grinding on the surface of the V-rib portion of the V-ribbed belt. It is an object of the present invention to provide a grinder wheel to be used in the method for producing a grinder.

[0009]

Means for Solving the Problems In order to achieve the above object, a method for manufacturing a V-ribbed belt according to the present invention comprises sequentially laminating a compression rubber layer, a tensile member layer, and a tension layer, integrating them, and circulating them. The compressed rubber layer of the traveling cylindrical body for forming a belt is formed of abrasives having different particle sizes , and the connecting portions of the abrasives having different particle sizes are flush over a predetermined partitioned area.
It is characterized in that an annular V-shaped grindstone adhered so as to be ground is ground with a grinder wheel raised on the peripheral surface, and the grinder wheel used in the method of manufacturing this V-ribbed belt is provided on both side walls of the annular V-shaped core, An annular wide shallow groove is formed, and a coarse granular abrasive is disposed in the shallow groove, and a fine granular abrasive is disposed on the other wall surface of the V-shaped core. The connection portion between the two abrasive particles is attached so as to be flush with the surface of the V-shaped grinding wheel.

[0010]

Next, specific embodiments of the present invention will be described with reference to the drawings. First, a belt forming tubular body (1) which is a material of a V-ribbed belt will be described with reference to FIG. FIG. 3 is a partial longitudinal sectional view showing a manufacturing process of the belt-forming cylindrical body used in the present invention, and a canvas (3) having elasticity on the peripheral surface of a cylindrical-forming drum (2) is attached to the drum (2). The stretching direction is made to match the circumferential direction of 2), that is, the longitudinal direction of the manufactured belt, and one or a plurality of the belts are wound to form a tension layer (4), and then a cushion rubber layer (5) and the same layer (5). ), A tensile strength layer (7) composed of a high-strength, low-strength rope tensile strength body (6) wound spirally and a compressed rubber layer (8) having a sufficient thickness are sequentially laminated. The laminate thus obtained is integrally vulcanized by a known pressurizing and heating means to obtain a wide flat belt-like cylindrical body for belt forming (1). If necessary, short fibers (9) can be mixed into the compressed rubber layer (8) while maintaining the orientation matching the axial direction of the cylindrical forming drum (2). The above-described belt forming tubular body (1) is removed from the forming drum (2).

Next, as shown in FIG. 4, the belt-forming tubular body (1) has a compressed rubber layer (8) disposed on the surface side between a pair of driving drums (11) and driven drums (12). And a grinder wheel (1) on one of the driving drum (11) and the driven drum (12).
3), and positioning rolls (31) are arranged at positions close to the grinder wheel (13), respectively.

The grinder wheel (13) shown in FIG. 1 has a cylindrical shape as a whole, and has a cylindrical metal core (14).
A plurality of annular V-shaped grindstones (16) corresponding to the desired rib groove shape of the V-ribbed belt are raised at a predetermined pitch in the circumferential direction of the surface. As shown in FIGS. 2 and 8, the annular V-shaped grinding wheel (16) has a wide annular shallow groove formed on a part of both side surfaces of the annular V-shaped core (15) of the V-shaped grinding wheel. 17) A particulate abrasive (18) having a large particle size of 80 to 100 mesh, such as diamond particles, is embedded therein, and the other part of the annular V-shaped core (15), specifically, the annular V-shaped core (15). A) Abrasive material (19) having a small particle size of 120 to 150 mesh, for example, diamond particles, is adhered in a stuck form, for example, using an electrodeposition means, from the front end portion and the base portion to the hem portion. The coarsely divided region (20) formed by the particles (18) and the finely divided region (21) formed by the abrasive particles (19) having a small particle size include :
That is, the connecting portions of the abrasives having different particle sizes are formed so as to be flush with each other on the surface of the annular V-shaped core (15).

On the other hand, a positioning roll (31) shown in FIG.
Is disposed in the vicinity of the grinder wheel (13) and immediately before the grinding operation of the grinder wheel (13), and in particular, a pair of drums (11) and (12) on which the belt-forming tubular body (1) is stretched. It is excellent in suppressing the sliding movement of the tubular body (1) that occurs when the span is large. This positioning roll (31) has the same shape and the same pitch as the V-shaped grindstone (16) on the grinder wheel (13) on the peripheral surface of the cylindrical body, as in the case of the grinder wheel. The V-shaped projection (32) is configured to be raised, and to be pressed against the belt forming cylindrical body (1) by a pressing means such as a spring (33) during the grinding operation of the grinder wheel (13). . In the apparatus having the above configuration, the belt-forming tubular body (1) circulates by activating the drive drum (11). Under this condition, the grinder wheel (13) is pressed against the surface of the belt-forming tubular body (1) while rotating the grinder wheel (13) in a direction opposite to the rotation direction of the drive drum (11). The V-ribs (24) of a plurality of V-ribbed belts (23) extending in the circumferential direction are applied to the compressed rubber layer (8) of the cylindrical body for belt forming (1) by the V-shaped grindstone (16) of the grinder wheel (13). ) Groups are formed.

In the process of forming the group of belt ribs (24), the V-groove of the V-pulley to which the V-ribbed belt (23) fits is formed on both side walls of each V-rib (24) of the belt (23). The contacting portion has a rough polished surface (25) due to the rough section area (20) of the V-shaped grindstone (16) of the grinder wheel (13), and the V-rib at the tip and bottom of the belt V-rib. The fine polished surface (26) is ground and formed by the fine section area (21) of the shaped whetstone (16) without any step between the finished surfaces (25) and (26) (FIGS. 5 and 5). 6). When the short fibers (9) are mixed in the width direction of the belt in the compressed rubber layer (8) constituting the cylindrical body (1) for forming a belt, a grinding process using a V-shaped grinding wheel (16) is performed. In the belt V rib part (2
Of the 4), a roughened surface (25) 'where a part of the short fiber (9) protrudes long at a portion in contact with the V pulley, and the other end of the short fiber (9) at another portion of the belt rib portion. The amount of protrusion is remarkably suppressed, and a fine finished surface (26) 'is formed (see FIG. 7).

Each of the positioning rolls (31) responds to an increase in the depth of the V-groove cut into the compressed rubber layer (8) of the belt-forming cylindrical body (1) by the V-shaped grinding wheel (16). The group of annular V-shaped projections (32) fits into each V-groove in the course of molding, traces the V-groove, and makes the drum (11) of the cylindrical body (1) for belt molding.
(12) The occurrence of displacement on the surface is suppressed, and a V-shaped grinding wheel (16)
Assists accurate grinding of the cylindrical body (1) for forming a V-belt.

[0016]

According to the present invention, in the process of forming the belt V-rib portion, the rough finished surface and the fine finished surface can be simultaneously formed separately on the V-rib peripheral surface, and the boundary surface between the both finished surfaces is flush with each other. As a result, the work efficiency is greatly improved and the belt
Noise and unusual noise are suppressed on the rough surface in the middle of the belt, and the base is located closer to the tip and base of the V-rib of the belt.
In the finely finished surface over the part, it is possible to sufficiently exert the effect of each finished surface, that is, to suppress the occurrence of cracks that occur more frequently from the part, and at the boundary between both finished surfaces. By suppressing the occurrence of the step, the appearance of the belt itself can be improved.

[0017] A plurality of types of abrasives having significantly different particle sizes can be obtained by attaching an abrasive having a large particle size to an annular wide shallow groove formed on the side wall surface of an annular V-shaped grinding wheel constituting a grinder wheel. Even in the formation of the divided areas for each grinding of the V-shaped grinding wheel using the method, the leveling between the divided areas becomes easy, and the adoption of the grinding section area having no step allows the belt to be cut out to be formed. A V-ribbed belt having no step on the V-rib surface can be realized by a single grinding operation.

[Brief description of the drawings]

FIG. 1 is a sectional view of an upper half of a grinder wheel.

FIG. 2 shows an annular V which forms part of a grinder wheel
It is a sectional view of a part of shaped stone.

FIG. 3 is a partial vertical cross-sectional view illustrating a manufacturing process of a tubular body for forming a belt.

FIG. 4 is a schematic front view of a V-ribbed belt manufacturing apparatus for performing a V-rib grinding operation on a cylindrical body for forming a belt.

FIG. 5 is an enlarged view of a part of the V-ribbed belt.

6 is an enlarged view of a part of the V-ribbed belt shown in FIG.

FIG. 7 is a view corresponding to FIG. 6 showing another embodiment.

FIG. 8 is an enlarged sectional view of a part of an annular V-shaped core forming an annular V-shaped grindstone of a grinder wheel.

FIG. 9 is a view corresponding to FIG. 2 of a conventional annular V-shaped grinding wheel of a grinder wheel.

[Explanation of symbols]

 Reference Signs List 1 cylindrical body for belt forming 4 tensile layer 7 tensile layer 8 compressed rubber layer 13 grinder wheel 15 annular V-shaped core 16 annular V-shaped grindstone 17 wide annular shallow groove 18 large-grained abrasive material 19 granularity Small granular abrasive 20 Coarse section area 21 Fine section area 23 V-ribbed belt 24 V rib 25 Coarse finished surface 26 Fine finished surface

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B24B 9/02 B29D 29/10 F16G 5/00 F16G 5/08 F16G 5/20 B24B 19/00 B29H 7 / 22 B24D 5/14

Claims (3)

(57) [Claims] 1. A compression rubber layer, a tensile member layer, and a tension layer are sequentially laminated, integrated with each other, and an abrasive having a different particle size is applied to a predetermined section on a surface of the compression rubber layer of the circulating belt-forming cylindrical body. Across the region, the connecting portions of the abrasives of different
A method for manufacturing a V-ribbed belt, comprising: an annular V-shaped grindstone adhered so as to have a uniform shape is raised on a peripheral surface, and a rotating grinder wheel is ground. 2. An annular V-shaped grindstone divides an intermediate portion of the grindstone into a coarsely divided region having a large grain size and a skirt portion from a tip portion and a base portion of the grindstone into a finely divided region having a small grain size. The connection part of each different whetstone is flush
The method for manufacturing a V-ribbed belt according to claim 1. 3. A grinder wheel for forming a V-rib of a belt by grinding a compression rubber layer of a cylindrical body for forming a belt in which a compression rubber layer, a tensile member layer, and a tension layer are laminated and integrated. V of the V-shaped grinding wheel erected on the surface
An annular wide shallow groove is formed on each side wall of the shaped core, and a coarse granular abrasive is provided in the groove, and a fine granular abrasive is provided from the tip and base to the base of the V-shaped core. Wherein the divided regions of the two abrasives are flush with the surface of the V-shaped grindstone, the grinder wheel for producing a V-ribbed belt.