JP2006007375A - Method and device for manufacturing v-ribbed belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a V-ribbed belt excellent in productivity. <P>SOLUTION: A belt sleeve 1 composed of at least a core wire and a rubber layer is wound around a driving roll 11 and a tension roll 12, and the driving roll 11 is rotated at a predetermined speed for making the belt sleeve 1 travel. A grinding wheel 13 having a plurality of protrusions with V-shaped cross sections on its surface is abutted to the surface of the belt sleeve 1 while being rotated so as to form a plurality of rib parts on the surface of the belt sleeve 1. At this time, a contact surface between the driving roll 11 and the belt sleeve 1 is supplied with water by an atomizer 15. By doing this, slippage between the driving roll 11 and the belt sleeve 1 gets hard to occur even the belt sleeve 1 travels at high speed and the rib parts can be formed in a short period of time. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method and apparatus for manufacturing a V-ribbed belt by grinding a belt sleeve.

Patent Document 1 discloses a method for manufacturing a V-ribbed belt as follows. That is, (A) a flat belt-like belt sleeve is set with a predetermined tension between the two axes of the drive roll and the tension roll with the rib forming surface facing outward. (B) The belt sleeve is rotated at a predetermined traveling speed by driving the drive roll. (C) Electrodepositing 50-200 mesh diamond abrasive grains on the surface and rotating a grinding wheel having a large number of V-shaped projections at a predetermined number of revolutions while rotating the surface of the rotating belt sleeve for a predetermined time By abutting, a plurality of protrusions are simultaneously formed on the belt sleeve. (D) A belt sleeve formed with a plurality of protrusions is cut into a predetermined width to obtain a V-ribbed belt.
Japanese Patent No. 2698899 (FIGS. 1 and 2)

  Here, as one approach for improving the production efficiency in the above-described prior art, it is conceivable to increase the rotational speed of the drive roll to cause the belt sleeve to run at a high speed and to grind efficiently with a grinding wheel in a short time. However, in the prior art, when the driving speed of the drive roll is increased, a large resistance acts on the belt sleeve due to friction with the grinding wheel, slip occurs between the drive roll and the belt sleeve, and the grinding surface is uneven. There is a risk of it. Therefore, there is a limit to increasing the rotational speed of the drive roll, and there remains room for improvement in terms of production efficiency.

Means and effects for solving the problems

  The problems to be solved by the present invention are as described above. Next, means for solving the problems and the effects thereof will be described.

  ◆ According to the first aspect of the present invention, the following V-ribbed belt manufacturing method is provided. A belt sleeve composed of at least a core wire and a rubber layer is wound around a driving roll and a tension roll, the driving roll is rotated at a predetermined speed, and a grinding wheel having a plurality of V-shaped projections on the surface is rotated. Forming a plurality of ribs on the surface of the belt sleeve by contacting the surface of the belt sleeve; In this process, water is supplied to the contact surface between the drive roll and the belt sleeve.

  As a result, even when a large load is applied to the traveling belt sleeve due to friction with the grinding wheel, the water interposed between the belt sleeve and the drive roll increases the adhesion between the two, preventing the belt sleeve from slipping. The Therefore, even if the speed of the belt sleeve is increased, the rib portion can be appropriately formed, and the production efficiency of the V-ribbed belt is excellent. Moreover, since it is a simple method of supplying water, it can be made low-cost.

  In the V-ribbed belt manufacturing method, the water is preferably supplied to a position where the belt sleeve and the driving roll start to contact each other. Thereby, since water is efficiently supplied between the belt sleeve and the drive roll, there is an advantage that the slip of the belt sleeve is surely prevented and the waste of water is reduced.

  In the V-ribbed belt manufacturing method, the water is preferably supplied over the entire width direction of the belt sleeve. Thereby, the anti-slip effect is exhibited evenly, and the slip of the belt sleeve is surely prevented.

  In the manufacturing method of the V-ribbed belt, the water is preferably supplied in the form of a spray. Thereby, it is easy to diffuse and supply water uniformly over a wide area of the belt sleeve and the drive roll, and it is possible to prevent the amount of supplied water from becoming excessive.

  ◆ According to the second aspect of the present invention, there is provided a V-ribbed belt manufacturing apparatus configured as follows. A driving roll and a tension roll for winding a belt sleeve made of at least a core wire and a rubber layer; a grinding wheel having a plurality of V-shaped projections on the surface which can contact the belt sleeve while rotating; Water supply means for supplying water to a contact surface between the drive roll and the belt sleeve.

  Thus, even when a large load is applied to the traveling belt sleeve due to friction with the grinding wheel, slippage of the belt sleeve is suppressed by the water between the belt sleeve and the drive roll. Therefore, even if the speed of the belt sleeve is increased, the rib portion can be appropriately formed, so that a manufacturing apparatus excellent in the production efficiency of the V-ribbed belt can be provided.

  In the V-ribbed belt manufacturing apparatus, the water supply means is preferably a spray spray. As a result, it is easy to diffuse and supply water uniformly over a wide area of the belt sleeve and the drive roll, and it is possible to prevent the amount of supplied water from becoming excessive, thereby preventing slippage. .

  First, an annular belt sleeve 1 as a material of a V-ribbed belt will be described with reference to FIG. FIG. 1 is a cross-sectional perspective view showing the configuration of the belt sleeve. The belt sleeve 1 includes a canvas forming a cover canvas 5, a rubber sheet forming an adhesive rubber layer 3, and an adhesive-treated twisted cord forming a core wire 2 on an outer peripheral surface of a cylindrical forming drum (not shown). The rubber sheet forming the compressed rubber layer 4 is wound in order, and the obtained molded body is obtained by vulcanization by a known heating and pressing means.

  As the compressed rubber layer 4, for example, chloroprene rubber (CR), ethylene propylene rubber (EPDM), chlorosulfonated polyethylene (CSM), alkylated chlorosulfonated polyethylene (ACSM), hydrogenated nitrile rubber (HNBR), etc. are used. It is done. The compressed rubber layer 4 is desirably mixed with short fibers such as nylon 6, nylon 66, polyester, cotton, and aramid to improve the side pressure resistance.

  As the cord constituting the core 2, for example, a twisted cord made of a fiber such as polyethylene terephthalate (PET) fiber or polyethylene-2,6-naphthalate (PEN) is used. As the cover canvas 5, a cloth woven into a plain weave, twill weave, satin weave, or the like using yarn made of cotton, polyamide, polyethylene terephthalate, or aramid fiber is used.

  Next, the process of forming a rib part in the belt sleeve 1 produced as described above will be described with reference to FIGS. FIG. 2 is a side view showing how the belt sleeve is ground, and FIG. 3 is a sectional view taken along the line 3-3 in FIG.

  In this step, as shown in FIG. 2, the belt sleeve 1 is wound between the drive roll 11 and the tension roll 12 with an appropriate tension applied. The belt sleeve 1 is wound around both rolls 11 and 12 so that the rubber sheet forming the compressed rubber layer 4 shown in FIG.

  In the state of FIG. 2, the drive roll 11 is rotated in the direction of the thick arrow to cause the belt sleeve 1 to travel in the direction of the white arrow, and the grinding wheel 13 disposed in the vicinity of the drive roll 11 is connected to the drive roll 11. Rotate in the same direction. Here, the rotational speed of the drive roll 11 is set such that the traveling speed of the belt sleeve 1 is 50 to 150 millimeters / second, for example, and the rotational speed of the grinding wheel 13 is set to 1800 rpm, for example.

  In addition, diamond abrasive grains are electrodeposited on the surface of the grinding wheel 13, and as shown in FIG. 3 as a sectional view taken along the line 3-3 in FIG. For example, 50 to 150) V-shaped projections 14 are formed. Then, the grinding wheel 13 is rotated and brought into contact with the surface of the running belt sleeve 1, so that the portion of the protrusion 14 bites into the compressed rubber layer 4 to form a groove. As a result, a large number of protrusions that become the rib portions 7 are formed on the compressed rubber layer 4 of the belt sleeve 1.

  In this embodiment, as indicated by reference numeral 15 in FIG. 2, when the belt sleeve 1 is ground by the grinding wheel 13, water is supplied to the contact surface between the rotating drive roll 11 and the belt sleeve 1. It is desirable that water is supplied over the entire width of the belt sleeve 1 at a position where the belt sleeve 1 and the driving roll 11 start to contact each other.

  The amount of water supplied is appropriately adjusted so that the inner surface of the belt sleeve 1 and the outer surface of the drive roll 11 are uniformly wetted over the entire surface. It is preferable that the water is continuously supplied to such an extent that micro holes formed between the micro unevenness on the outer surface of the drive roll 11 and the micro unevenness on the inner surface of the belt sleeve 1 are always filled. Excessive supply of water is undesirable because it causes slippage between the drive roll 11 and the belt sleeve 1. As a specific means for supplying water, in this embodiment, a spray (spray nozzle) 15 is employed.

  By adopting such a grinding method, the micro-holes formed in the contact surface between the belt sleeve 1 and the drive roll 11 are filled with water due to the surface tension of the water. The adhesion between them increases. Therefore, even if the load or resistance applied to the belt sleeve 1 increases, the slip between the two 1 and 11 can be suppressed, so that the rotational speed of the drive roll 11 can be increased, and the formation time of the rib portion 7 can be shortened. Production efficiency can be improved. Moreover, since it is the simple structure of supplying water, it does not become an increase factor of cost.

  The belt sleeve 1 in which the rib portions 7 are formed in this manner can be cut into rounds at predetermined widths, whereby a finished V-ribbed belt 10 as shown in FIG. 4 can be obtained.

  In the present embodiment, as described above, water is supplied to a position where the belt sleeve 1 and the drive roll 11 start contact. As a result, water is efficiently supplied to the contact surface, the slip prevention effect can be ensured, and water waste can be reduced. Furthermore, in this embodiment, since water is supplied to the whole width direction of the belt sleeve 1, the slip prevention effect by water is exhibited uniformly. In addition, in this embodiment, since water is supplied by the spray 15, it is easy to diffuse and supply water over a wide area over the entire width direction of the belt sleeve 1, and appropriately adjust the supply amount of water. It is also possible to prevent slipping of the belt sleeve 1 due to excessive supply of water.

  In order to demonstrate the effect of the present invention, the inventor conducted the following experiment. A belt sleeve 1 using chloroprene rubber is prepared as a rubber sheet for forming the compression rubber layer 4, and water is supplied uniformly over the entire width of the belt sleeve 1 to the contact surface between the belt sleeve 1 and the drive roll 11, In a state where the driving roll 11 is rotated so that the traveling speed of the sleeve 1 is 75 millimeters per second, the grinding wheel 13 having 80 protrusions 14 having a V-shaped cross section is rotated and brought into contact with the belt sleeve 1. Grinding was performed so that the predetermined rib portion 7 was formed.

  In grinding, the rotational speed of the drive roll 11 is increased in increments of 10% from the standard 75 millimeters per second to 100% increase (that is, 150 millimeters per second, which is twice the standard), and the belt at each rotational speed. The presence or absence of slip between the sleeve 1 and the drive roll 11 was visually examined. Further, the time required for completing the rib portion 7 on the belt sleeve 1 at each rotational speed was measured. As a comparative example, the same experiment was performed when water was not supplied to the contact surface between the belt sleeve 1 and the drive roll 11.

The results of the experiment are shown in Table 1. The required grinding time is expressed as a ratio to the required grinding time when grinding is performed at a standard 75 millimeters per second.

  As shown in the above table, in the comparative example in which water is not supplied, slip occurs when the rotational speed of the drive roll 11 is increased by 80% from the standard speed, whereas when water is supplied, the rotational speed of the drive roll 11 is increased. However, no slip was observed even when the increase was 100%. And since the required time for grinding is 0.42 times the standard required time when the speed is increased by 80%, and the required time for grinding is 0.37 times the standard required time when the speed is increased by 100%. As a result, the present invention for supplying water has more room for shortening the production time.

  Further, since slip was not recognized even when the rotational speed of the drive roll 11 increased by 100%, there was room for the grinding required time to be 0.37 times or less of the standard required time due to the increased speed of the drive roll 11, and the V-ribbed belt. It can be seen that the production efficiency can be improved to at least 2.7 times the standard (= 1 / 0.37) or more. That is, an increase in the rotational speed of the drive roll 11 can be directly connected to a shortening of the grinding time, and the production efficiency can be improved.

  In the above embodiment, the main purpose is to improve the productivity by increasing the speed of the drive roll 11, but instead of reducing the grinding time by increasing the speed of the grinding wheel 13, the configuration of supplying water is effective. is there. That is, even when the speed of the grinding wheel 13 is increased, the resistance generated in the belt sleeve 1 increases. However, even in this case, the belt sleeve 1 is in close contact with the drive roll 11 by water, so that slip can be prevented.

The cross-sectional perspective view which shows the structure of a belt sleeve. The side view which shows the mode of grinding of a belt sleeve. FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. 2. The cross-sectional perspective view which shows the structure of the completed V-ribbed belt.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Belt sleeve 2 Core wire 4 Compression rubber layer 5 Cover canvas 7 Rib part 10 V ribbed belt 11 Drive roll 12 Tension roll 13 Grinding wheel 14 Protrusion

Claims (6)

A belt sleeve composed of at least a core wire and a rubber layer is wound around a driving roll and a tension roll, and the driving roll is rotated at a predetermined speed, and a grinding wheel having a plurality of V-shaped projections on the surface is rotated. In a method for manufacturing a V-ribbed belt, including a step of forming a plurality of rib portions on the surface of the belt sleeve by contacting the surface of the belt sleeve,
In the step, water is supplied to the contact surface between the drive roll and the belt sleeve.   2. The method of manufacturing a V-ribbed belt according to claim 1, wherein the water is supplied to a position where the belt sleeve and the driving roll start to contact each other.   3. The method of manufacturing a V-ribbed belt according to claim 1, wherein the water is supplied over the entire width direction of the belt sleeve. 4.   The method for manufacturing a V-ribbed belt according to any one of claims 1 to 3, wherein the water is supplied in a sprayed manner. A drive roll and a tension roll for winding a belt sleeve comprising at least a core wire and a rubber layer;
A grinding wheel having a plurality of V-shaped projections on the surface that can rotate and contact the belt sleeve;
An apparatus for manufacturing a V-ribbed belt, comprising: water supply means for supplying water to a contact surface between the drive roll and the belt sleeve.   6. The V-ribbed belt manufacturing apparatus according to claim 5, wherein the water supply means is a spray.

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