JP2020093881A - Manufacturing method of toothed belt and toothed belt obtained by the same - Google Patents

Abstract

To provide a manufacturing method of a toothed belt capable of laying a fluorine-based material on the surface of the side where a plurality of teeth are disposed, and to provide a toothed belt obtained by the same.SOLUTION: A manufacturing method of a toothed belt comprises: a first step of forming a seat part 200 by integrally forming a thin film 220 made of a thermoplastic resin having a higher adhesiveness to a belt body part 100 than that of a film 210 made of a fluorine-based material on one surface of the film 210; and a second step of integrally forming the belt body part 100 on the thin film 220 side of the seat part 200. In the first step, the seat part 200 is formed so as to have a shape matched with the surface on which a plurality of teeth 12 are formed.SELECTED DRAWING: Figure 4

Description

The present invention relates to a method for manufacturing a toothed belt having a plurality of teeth and a toothed belt.

In factories, toothed belts for conveying various parts and products are widely used in production processes, assembly processes, and the like. In such a toothed belt, measures against wear of the belt surface are taken in order to suppress quality deterioration. For example, a method of applying highly lubricious oil or wax to the belt surface and a method of integrally molding a highly slidable nylon cloth on the belt surface are known. However, in the former case, although the initial effect is high, the effect decreases with time, and regular maintenance is required. In addition, depending on the product to be conveyed and the application, it may not be possible to use oil or wax. In the latter case, since dust of fibers is generated, it cannot be used in a clean room or the like, and cannot be used even in the case of transporting food or the like. Further, although there is a countermeasure to make the material of the toothed belt itself a low friction material, a sufficient effect cannot be expected when high-speed and high-load operation is required. Even with the above two measures, a sufficient effect cannot be expected when high-speed and high-load operation is required.

Therefore, measures for integrally providing a sheet made of a fluorine-based material having excellent wear resistance on the surface of the belt are being studied. However, unlike a stretchable cloth, a sheet made of a fluorine-based material has almost no elongation and has a problem that it is difficult to integrally provide the surface of the toothed belt on the side where the teeth are provided. ing.

JP, 2008-31446, A JP, 2013-60986, A JP, 2008-296445, A

It is an object of the present invention to provide a method for manufacturing a toothed belt and a toothed belt that allow the surface on the side provided with a plurality of teeth to be made of a fluorine-based material.

The present invention adopts the following means in order to solve the above problems.

That is, the manufacturing method of the toothed belt of the present invention,
A belt main body made of polyurethane having a plurality of teeth,
A seat portion provided on a surface side of the belt main body portion on which a plurality of teeth are formed;
A method for manufacturing a toothed belt comprising:
A first step of molding the sheet portion by integrally molding a thin film made of a thermoplastic resin having higher adhesiveness to the belt body portion on one surface of the film made of a fluorine-based material,
After the first step, a second step of integrally molding the belt main body portion on the thin film side of the seat portion,
Along with
In the first step, the sheet portion is formed to have a shape that matches the surface on which the plurality of teeth are formed.

According to the present invention, the sheet portion composed of the film made of the fluorine-based material and the thin film made of the thermoplastic resin is formed in advance so as to have a shape matching the surface on which the plurality of teeth are formed. The belt main body made of polyurethane is integrally formed with the seat portion. Therefore, it is possible to manufacture the toothed belt in which the surface on the side provided with the plurality of teeth is made of the fluorine-based material.

Further, in the second step, by supplying a polyurethane material while arranging a plurality of core wires along the thin film side of the sheet portion, the belt having the plurality of core wires inside the sheet portion. The main body may be integrally molded.

Then, in the sheet portion formed in the first step, the plurality of core wires are directly contacted with a central portion that is a tooth bottom between the tooth-shaped portions and the tooth-shaped portions. The belt body may be molded.

As a result, since the core portion can be positioned by the seat portion, a recessed portion is not formed in a part of the belt for positioning the core wire.

The thin film may be polyamide resin or ABS resin.

The thickness of the film is preferably 0.05 mm or more and 1 mm or less.

The thickness of the thin film is preferably 20 μm or more and 500 μm or less.

The material of the core wire may be at least one of steel, stainless steel, aramid fiber, glass fiber, carbon fiber, nylon fiber, polyester fiber, and PBO fiber.

Further, the toothed belt of the present invention,
A belt main body made of polyurethane having a plurality of teeth,
A seat portion provided on the surface side of the belt body on which a plurality of teeth are formed;
A toothed belt comprising:
The seat portion is
A film made of fluorine-based material,
It is characterized by comprising a thin film made of a thermoplastic resin which is integrally provided on the surface of the film on the side of the belt main body and which has a higher adhesiveness with the belt main body than the film.

It should be noted that the above-mentioned respective configurations can be adopted in combination as much as possible.

As described above, according to the present invention, the surface on the side provided with the plurality of teeth can be made of a fluorine-based material.

1 is a plan view of a toothed belt according to a first embodiment of the present invention. FIG. 2 is a back view of the toothed belt according to the first exemplary embodiment of the present invention. FIG. 3 is a side view of the toothed belt according to the first exemplary embodiment of the present invention. FIG. 4 is a schematic cross-sectional view of the toothed belt according to the first exemplary embodiment of the present invention. FIG. 5 is a schematic cross-sectional view of the toothed belt according to the first exemplary embodiment of the present invention. FIG. 6 is a schematic sectional view of the toothed belt according to the first exemplary embodiment of the present invention. FIG. 7 is an explanatory diagram of the first step according to the first embodiment of the present invention. FIG. 8 is an explanatory diagram of the first step according to the first embodiment of the present invention. FIG. 9 is an explanatory diagram of the second step according to the first embodiment of the present invention. FIG. 10 is an explanatory diagram of the second step according to the first embodiment of the present invention. FIG. 11 is a side view of the toothed belt according to the second embodiment of the present invention. FIG. 12 is a side view of a general toothed belt.

MODES FOR CARRYING OUT THE INVENTION Modes for carrying out the present invention will be exemplarily described in detail below based on embodiments with reference to the drawings. However, the dimensions, materials, shapes, relative positions, etc. of the constituent parts described in this embodiment are not intended to limit the scope of the present invention to them unless otherwise specified. ..

(Example 1)
1 to 10, a method for manufacturing a toothed belt and a toothed belt according to a first exemplary embodiment of the present invention will be described. The toothed belt according to the present embodiment can be used, for example, in a factory to convey various parts and products.

<Toothed belt>
Particularly, with reference to FIGS. 1 to 6, the configuration of the toothed belt 10 according to the present embodiment will be described. 1 is a plan view of a toothed belt according to a first embodiment of the present invention, showing a part of the toothed belt. FIG. 2 is a back view of the toothed belt according to the first embodiment of the present invention, and shows a part of the toothed belt. Note that, in FIGS. 1 and 2, the core wire provided inside the toothed belt is shown transparently. FIG. 3 is a side view of the toothed belt according to the first embodiment of the present invention and shows a part of the toothed belt. 4 is a schematic cross-sectional view of the toothed belt according to the first exemplary embodiment of the present invention, which is a cross-sectional view taken along the line AA in FIG. FIG. 5 is a schematic cross-sectional view of the toothed belt according to the first exemplary embodiment of the present invention, which is a BB cross-sectional view in FIG. 2. FIG. 6 is a schematic cross-sectional view of the toothed belt according to the first embodiment of the present invention, which is a CC cross-sectional view in FIG. 2.

Externally, the toothed belt 10 according to the present embodiment includes a flat plate portion 11 and a plurality of teeth 12 provided on the back surface side of the flat plate portion 11 at regular intervals. In the internal structure of the toothed belt 10 according to the present embodiment, the belt main body 100 having the plurality of teeth 12 and the seat portion provided on the surface side of the belt main body 100 on which the plurality of teeth 12 are formed. 200 and a plurality of cords 300 provided inside the belt main body 100. The core wire 300 is arranged so as to extend straight in the longitudinal direction of the toothed belt 10. Further, the plurality of core wires 300 are arranged at equal intervals in the lateral direction of the toothed belt 10.

The belt body 100 is made of thermoplastic polyurethane resin. The sheet portion 200 is composed of a film 210 and a thin film 220. The film 210 is made of a fluorine-based material such as PFA (perfluoroalkoxyalkane). The thickness of the film 210 may be set to 0.05 mm or more and 1 mm or less. The thin film 220 is made of a thermoplastic resin having higher adhesiveness to the belt body 100 than the film 210. The melting point of the thermoplastic resin is higher than the melting point of the polyurethane resin forming the belt body 100. In addition, as a suitable example of the thermoplastic resin used for the thin film 220, PA (polyamide resin), ABS resin, AES (acrylonitrile ethylene-propylene-diene styrene) resin, ASA resin, PVC (polyvinyl chloride) resin Can be mentioned. The thickness of the thin film 220 may be set to 20 μm or more and 500 μm or less. As the core wire 300, a wire made of a plurality of fibers of the same kind or many kinds can be preferably used. As the material of the core wire 300, at least one of steel, stainless steel, aramid fiber, glass fiber, carbon fiber, nylon fiber, polyester fiber, and PBO fiber can be preferably used.

<Method for manufacturing toothed belt>
Particularly, with reference to FIGS. 7 to 10, a method for manufacturing the toothed belt 10 according to the present embodiment will be described. FIG. 7 is an explanatory diagram of the first step according to the first embodiment of the present invention, and is a diagram illustrating an example of a method of forming the seat portion 200. Note that FIG. 7 shows a schematic configuration of a main part of a molding device when molding the sheet portion 200 as viewed from the side surface side. FIG. 8 is an explanatory diagram of the first step according to the first embodiment of the present invention, and is a diagram illustrating another example of the forming method of the seat portion 200. Note that FIG. 8 shows a schematic configuration of a main part of a molding device when molding the sheet portion 200 as viewed from the side surface side. FIG. 9 and FIG. 10 are explanatory views of the second step according to the first embodiment of the present invention, and show how the belt body 100 is integrally molded with the seat 200. 9 shows a schematic configuration of the main part of the molding apparatus as seen from the side surface side, and FIG. 10 shows a schematic configuration of the main part of the molding apparatus as seen from the top surface side.

In the toothed belt 10 according to the present embodiment, first, after the seat portion 200 is formed (first step), the belt main body portion 100 is integrally formed on the formed seat portion 200. Hereinafter, the first step and the second step will be described.

<<1st step>>
In the first step, the seat portion 200 is molded as described above. Here, two methods of forming the seat portion 200 will be described.

<<<First molding method>>>
The first molding method of the seat portion 200 will be described with reference to FIG. 7. The molding apparatus used in the first molding method includes a pair of gear-shaped molds 510 and 520, and an extrusion nozzle 600 that supplies a molding material. The pair of molds 510 and 520 are configured to be rotatable in synchronization with each other in the direction of the arrow in the figure. Then, the film 210a, which is a raw material, is sent out in the direction of the arrow P1 in the drawing by the pair of molds 510 and 520, and is the material of the thin film 220 from the nozzle 600 at the meshing portion of the pair of molds 510 and 520. The thermoplastic resin 220a is supplied. The film 210a is preferably surface-treated in advance by immersing it in a sodium metal solution in order to improve the adhesiveness with the thermoplastic resin 220a. Then, the meshing portion of the pair of molds 510 and 520 is heated to a predetermined temperature. At this meshing portion, the thermoplastic resin 220a is cured, so that the thin film 220 is integrally molded with the film 210a. The hardened portion of the thermoplastic resin 220a protruding to the lateral side of the film 210a is cut off by a cutter or the like. The seat portion 200 thus obtained has a shape that matches the surface of the belt main body portion 100 on which the plurality of teeth 12 are formed.

<<<second molding method>>>
The second molding method of the seat portion 200 will be described with reference to FIG. 8. The molding apparatus used in the second molding method includes a gear-shaped mold 530, a belt-shaped dummy belt 540, a pressing roller 550 that applies tension to the dummy belt 540 and presses it toward the mold 530. And an extrusion nozzle 600 for supplying the molding material. The dummy belt 540 is configured to be wound around a plurality of rollers including the pressing roller 550, and is configured to rotate with a constant tension obtained. The dummy belt 540 is obtained by processing a Teflon (registered trademark) material or the like into a belt shape, or covering the toothed belt 10 as a product with a PFA heat shrink tube.

The mold 530 and the pressing roller 550 are configured to be rotatable in synchronization with each other in the direction of the arrow in the figure. The die 530 and the pressing roller 550 send the film 210a as a material and the dummy belt 540 in the direction of arrow P2 in the drawing, and at the meshing portion of the die 530 and the dummy belt 540, the thin film 220 from the nozzle 600. The thermoplastic resin 220a, which is a material of the above, is supplied. The film 210a is preferably surface-treated in advance by immersing it in a sodium metal solution in order to improve the adhesiveness with the thermoplastic resin 220a. Then, the meshing portion between the die 530 and the dummy belt 540 is heated to a predetermined temperature. At this meshing portion, the thermoplastic resin 220a is cured, so that the thin film 220 is integrally molded with the film 210a. The hardened portion of the thermoplastic resin 220a protruding to the lateral side of the film 210a is cut off by a cutter or the like. The seat portion 200 thus obtained has a shape that matches the surface of the belt main body portion 100 on which the plurality of teeth 12 are formed.

The sheet portion 200 obtained by the first molding method or the second molding method can be stored, for example, in the form of a roll.

<<Second step>>
The second step will be described with reference to FIGS. 9 and 10. The molding apparatus used in the second step is a gear-shaped mold 710, a plurality of rollers 720, 730, 740, a belt 750 wound around the plurality of rollers 720, 730, 740, and an extrusion for supplying a molding material. And a nozzle 800. The extrusion nozzle 800 is provided in the molding material supply device 810. The belt 750 is configured to wind around the plurality of rollers 720, 730, 740, and is configured to rotate in a state where a constant tension is obtained.

The mold 710 and the plurality of rollers 720, 730, 740 are configured to be rotatable in a state of being synchronized with each other in the direction of the arrow in the drawing. As a result, the sheet part 200 and the plurality of core wires 300 obtained in the first step are sent out in the arrow P3 direction by the mold 710 and the belt 750. Here, the plurality of core wires 300 are configured to be delivered in a state of being in partial contact with the seat portion 200. As a result, the plurality of cords 300 are positioned with respect to the seat portion 200. As described above, the sheet portion 200 and the plurality of core wires 300 are the material of the belt main body portion 100 from the nozzle 800 in the gap between the die 710 and the belt 750 while being fed in the direction of the arrow P3 in the drawing. The polyurethane resin 100a is supplied.

The space between the mold 710 and the belt 750 is heated to a predetermined temperature. A belt main body 100 obtained by curing the polyurethane resin 100a is integrally molded with the seat 200 at a portion between the mold 710 and the belt 750.

As described above, by supplying the polyurethane material (polyurethane resin 100a) along the plurality of core wires 300 on the thin film 220 side of the seat portion 200, the plurality of core wires 300 are provided inside the seat portion 200. The belt main body portion 100 having the same is molded. At this time, inside the belt main body 100, the plurality of core wires 300 are fixed in a state of being positioned with respect to the seat portion 200. This point will be described more specifically. In the second step, in the sheet portion 200 molded in the first step, a plurality of core wires are provided in the central portion (the portion corresponding to the tooth bottom) between the tooth 12 shaped portion and the tooth 12 shaped portion. The belt main body 100 is molded in a state where 300 is in direct contact. Thereby, the plurality of core wires 300 are fixed in a state of being positioned with respect to the seat portion 200.

The cured portion of the polyurethane resin 100a that protrudes to the side of the sheet portion 200 is cut off with a cutter or the like. The temperature at which the belt body 100 is molded is set to be higher than the melting point of the polyurethane resin 100a and lower than the melting point of the thermoplastic resin 220a. Therefore, the shape of the seat portion 200 is not deformed when the belt body portion 100 is molded. Through the above steps, the toothed belt 10 can be obtained.

<The manufacturing method of the toothed belt and the excellent points of the toothed belt according to the present embodiment>
By the manufacturing method according to the present embodiment, as described above, it is possible to manufacture the toothed belt 10 whose surface on the side on which the plurality of teeth 12 are provided is made of a fluorine-based material. That is, a sheet made of a fluorine-based material has characteristics that it has almost no elongation and has low adhesiveness with a polyurethane resin. Therefore, it is difficult to integrally mold the sheet on the side of the belt body 100 on which the plurality of teeth are formed. On the other hand, in the present embodiment, the belt main body 100 is integrally formed in advance with the seat portion 200 formed in advance in a shape that matches the surface of the belt main body 100 on which the plurality of teeth 12 are formed. , The above problems are solved. That is, the sheet portion 200 according to the present embodiment is configured by the film 210 made of a fluorine-based material and the thin film 220 made of a thermoplastic resin having excellent adhesiveness to the belt body portion 100. Since the thin film 220 and the belt main body 100 are configured to adhere to each other, the problem of adhesion can be solved. The sheet portion 200 is formed in advance into a shape that matches the surface of the belt main body portion 100 on which the plurality of teeth 12 are formed, so that the sheet made of a fluorine-based material has almost no elongation, It has been possible to solve the problem that it is difficult to perform integral molding according to the shape of the teeth.

As described above, the surface of the toothed belt 10 according to this embodiment on the side where the teeth 12 are provided is formed of the film 210 made of a fluorine-based material such as PFA. Therefore, since it has excellent wear resistance, it is possible to suppress wear when sliding on the pulley and the guide rail even when used at high speed and under high load. Therefore, the generation of dust due to wear can be suppressed, and the generation of abnormal noise can also be suppressed. Also, it can be used in a clean room or for food transportation. Further, since the durability is high, maintenance cost can be reduced.

Further, in the method for manufacturing the toothed belt 10 according to the present embodiment, in the second step, between the shape portion of the tooth 12 and the shape portion of the tooth 12 in the sheet portion 200 formed in the first step. The belt main body 100 is molded in a state where a plurality of core wires 300 are in direct contact with a central portion (a portion corresponding to a tooth bottom). As a result, the plurality of core wires 300 are fixed in a state of being positioned with respect to the seat portion 200, and the durability of the toothed belt 10 can be improved. This point will be described more specifically.

FIG. 12 is a side view of a general toothed belt, a part of which is shown in cross section. Also in this general toothed belt 900, similarly to the toothed belt 10 according to the present embodiment, a flat plate portion 910 and a plurality of teeth 920 provided on the back surface side of the flat plate portion 910 at regular intervals. Composed. The toothed belt 900 is made of thermoplastic polyurethane resin and has a plurality of core wires 930 therein. The distance (called “PLD”) from the bottom surface of the belt (the surface of the central portion between the teeth 12) to the center of the core wire 930 is one of the important factors in terms of quality. Therefore, when integrally molding the toothed belt 900 having the core wire 930 therein by the polyurethane resin, it is necessary to perform the molding while positioning the core wire 930. Therefore, in the toothed belt 900 obtained by integral molding, the groove 920X, which is a residue when the core wire 930 is positioned during molding, is formed. In this toothed belt 920, the groove 920X is easily bent. Therefore, the groove 920X becomes a cause of narrowing the scope of selection of the material of the core wire 300 and lowering the durability of the toothed belt 900. On the other hand, in the case of the present embodiment, the PLD can be defined by the thickness of the seat portion 200 itself, and the groove 920X as described above is not formed. Therefore, the toothed belt 10 according to the present embodiment can improve durability.

(Example 2)
Embodiment 2 of the present invention is shown in FIG. In the first embodiment, the case where the tooth shape is a trapezoidal toothed belt when viewed from the side is shown, but in the present embodiment, the case where the tooth shape is an arcuate toothed belt when viewed from the side is described. .. Since the basic structure and operation are the same as those of the first embodiment, the description thereof will be omitted as appropriate. FIG. 11 is a side view of the toothed belt according to the second embodiment of the present invention, and a part thereof is shown in cross section.

Also in the toothed belt 10X according to the present embodiment, as in the case of the above-described first embodiment, in terms of outer shape, the flat plate-shaped portion 11X and a plurality of teeth provided on the back surface side of the flat-plate-shaped portion 11X at regular intervals. It is composed of 12X. Also, in the toothed belt 10X according to the present embodiment, as in the case of the above-described first embodiment, in the internal structure, the belt main body 100X having the plurality of teeth 12X, and the plurality of teeth 12X in the belt main body 100X. The seat portion 200X is provided on the surface side on which is formed, and the plurality of core wires 300 provided inside the belt main body portion 100X.

In the toothed belt 10 according to the above embodiment, for example, as shown in FIG. 3, the shape of the teeth 12 is trapezoidal when viewed from the side, whereas in the toothed belt 10X according to the present embodiment, The difference is that the shape of the tooth 12X is an arc shape when viewed from the side. In addition, the material and manufacturing method of each member are the same as those in the first embodiment. Therefore, also in the toothed belt 10X and the manufacturing method thereof according to the present embodiment, it is possible to obtain the same effects as in the case of the first embodiment.

10,10X toothed belt 11,11X flat plate portion 12,12X teeth 100,100X belt body portion 100a polyurethane resin 200,200X sheet portion 210,210a film 220 thin film 220a thermoplastic resin 300 core wire 510,520,530 mold 540 Dummy belt 550 Pressing roller 600 Nozzle 710 Mold 720, 730, 740 Roller 750 Belt 800 Nozzle 810 Molding material supply device

Claims (9)

A belt main body made of polyurethane having a plurality of teeth,
A seat portion provided on a surface side of the belt main body portion on which a plurality of teeth are formed;
A method for manufacturing a toothed belt comprising:
A first step of molding the sheet portion by integrally molding a thin film made of a thermoplastic resin having higher adhesiveness to the belt body portion on one surface of the film made of a fluorine-based material,
After the first step, a second step of integrally molding the belt main body portion on the thin film side of the seat portion,
Along with
In the first step, the method for manufacturing a toothed belt, wherein the sheet portion is formed into a shape that matches the surface on which the plurality of teeth are formed. In the second step, by supplying a polyurethane material while arranging a plurality of core wires along the thin film side of the sheet portion, the belt main body portion having the plurality of core wires inside the sheet portion. The method for manufacturing a toothed belt according to claim 1, wherein the toothed belt is integrally molded. The belt main body in a state where the plurality of core wires are in direct contact with a central portion which is a tooth bottom between the tooth-shaped portions and the tooth-shaped portions of the sheet portion formed in the first step. The method for manufacturing a toothed belt according to claim 2, wherein the portion is formed. The method for manufacturing a toothed belt according to claim 1, wherein the thin film is a polyamide resin. The method for manufacturing a toothed belt according to claim 1, 2, or 3, wherein the thin film is an ABS resin. The method for producing a toothed belt according to claim 1, wherein the film has a thickness of 0.05 mm or more and 1 mm or less. The method for manufacturing a toothed belt according to claim 1, wherein the thin film has a thickness of 20 μm or more and 500 μm or less. The material of the core wire is at least one of steel, stainless steel, aramid fiber, glass fiber, carbon fiber, nylon fiber, polyester fiber, and PBO fiber. The method for manufacturing a toothed belt according to any one of claims. A belt main body made of polyurethane having a plurality of teeth,
A seat portion provided on the surface side of the belt body on which a plurality of teeth are formed;
A toothed belt comprising:
The seat portion is
A film made of fluorine-based material,
A tooth which is integrally provided on the surface of the film on the side of the belt main body and is composed of a thin film made of a thermoplastic resin having higher adhesiveness to the belt main body than the film. Attached belt.

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