JP2013167292A - Joining structure for composite - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure joining strength regardless of a type of a joining material.SOLUTION: In a joining structure 10 for a composite, the two composites 15 each including reinforcement wire 12 embedded in a base material 11 with an end 13 projected from the base material 11 to the outside are joined to each other by a joining material 16 while the ends 13 of the two reinforcement wires 12 in the two composites 15 are embedded. The ends 13 of the two reinforcement wires 12 are projected from the base materials 11 to the outside while periodically being inflected so that the end 13 of one of the reinforcement wires 12 and the end 13 of the other reinforcement wire 12 are intertwined with each other to alternately appear in a planar view from a direction intersecting with projecting directions of the ends 13.

Description

  The present invention relates to a joint structure of a composite.

  Conventionally, for example, as shown in Patent Document 1 below, a plurality of steel cords having different lengths are extended from end edges of belts facing each other, and steel cords extending from both end edges are laterally extended. There is known a belt joining structure in which adjacent steel cords are joined together by joining rubbers which are arranged in parallel at intervals and sandwiched and vulcanized within the intervals.

Japanese Patent No. 4132241

  However, in the conventional belt joining structure, the joining strength against the tension acting on the belt so as to pull out the steel cord from the joining rubber is ensured by, for example, the adhesive strength between the joining rubber and the steel cord or the strength of the joining rubber. Therefore, there is a problem that the composition of the bonding rubber is limited and the degree of freedom in design is low.

  This invention is made | formed in view of the situation mentioned above, The objective is to provide the joining structure of the composite_body | complex which can ensure joining strength irrespective of the kind of joining material.

In order to solve the above problems, the present invention proposes the following means.
The composite joined structure according to the present invention is such that composites formed by projecting end portions of reinforcing wires embedded in a base material to the outside from the base material are both reinforced by the joint material. It is a composite joint structure joined while burying the ends of the wire, and the ends of the two reinforcing wires are one of the reinforcements in plan view as viewed from the direction intersecting the protruding direction of the ends. The end of the wire rod and the other end of the reinforcing wire rod protrude from the base material while being periodically bent so as to be intertwined with each other and appear alternately.

According to the present invention, the ends of the two reinforcing wires are externally exposed from the base material so that the ends of the one reinforcing wire and the other reinforcing wire are intertwined with each other and appear alternately in the plan view. Since it protrudes while being bent periodically, for example, when tension is applied to the composite to pull out the reinforcing wire from the bonding material, the bent portions at the ends of both reinforcing wires are bound to each other. A large compressive force is generated between the two bent portions, and it is possible to prevent the reinforcing wire from being pulled out from the bonding material. This makes it possible to prevent the reinforcing wire from being pulled out of the bonding material even if the adhesive force between the reinforcing wire and the bonding material is small or the strength of the bonding material is low. Regardless of this, the bonding strength can be ensured.
In addition, since the bonding strength can be ensured regardless of the type of the bonding material, the degree of design freedom can be increased. For example, when natural vulcanized rubber that can be vulcanized without being heated or pressurized by a vulcanizer is used as the bonding material, the bonding material is vulcanized without using a vulcanizer. Can be joined, and the work can be simplified.

  In addition, the two bent portions at the ends of the both reinforcing wires have the same wavelength in the plan view, and the ratio of the total amplitude in the plan view to the wire diameter is 0.7 or more in the bent portion. The ratio of the total amplitude to the wavelength may be 0.003 or more, and the two bent portions may be entangled with each other over a length of six cycles or more along the protruding direction.

In this case, in the bent portion, the ratio of the total amplitude to the wire diameter is 0.7 or more, the ratio of the total amplitude to the wavelength is 0.003 or more, and both the bent portions have six cycles along the protruding direction. Since they are entangled with each other over a length of more than a minute, it is possible to effectively increase the compressive force generated between the two bent portions, and to ensure good bonding strength.
That is, in the bent portion, the ratio of the total amplitude to the wire diameter is less than 0.7, the ratio of the total amplitude to the wavelength is less than 0.003, or both bent portions have six cycles along the protruding direction. If they are entangled with each other only over a length of less than a minute, the relative magnitude of the total amplitude with respect to the wire diameter and wavelength at the bent portion and the length of the bent portion entangled with each other are small, It is difficult to increase the compressive force generated between the two bent portions, and it may be difficult to ensure good bonding strength.

  According to the joint structure of the composite according to the present invention, the joining strength can be ensured regardless of the kind of the joining material.

It is a top view which shows the joining structure of the rubber elastic body which concerns on one Embodiment of this invention. It is sectional drawing of the steel cord which comprises the joining structure shown in FIG. It is a top view of the steel cord which comprises the joining structure shown in FIG. It is a top view which shows the joining method which joins a rubber elastic body by the joining structure shown in FIG. It is a top view which shows the joining method which joins a rubber elastic body by the joining structure shown in FIG. It is sectional drawing of the steel cord which comprises the joining structure of the rubber elastic body which concerns on the modification of this invention. It is sectional drawing of the steel cord which comprises the joining structure of the rubber elastic body which concerns on the modification of this invention. It is a top view which shows the joining structure of the rubber elastic body which concerns on the modification of this invention.

Hereinafter, a rubber elastic body bonding structure (composite bonding structure) according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, in a rubber elastic body bonding structure 10, rubber formed by projecting an end 13 of a steel cord (reinforcing wire) 12 embedded in a main rubber (base material) 11 from the main rubber 11. The elastic bodies (composites) 15 are joined together by the joining material 16 while the end portions 13 of both steel cords 12 of both rubber elastic bodies 15 are embedded. The two rubber elastic bodies 15 constitute, for example, an endless belt-like rubber crawler or a conveyor belt.

The main body rubber 11 is formed in an end band shape, and both rubber elastic bodies 15 have opposite end edges 14 of both main body rubbers 11 and the width directions of both main body rubbers 11 coincide with each other. The width direction is arranged to be the depth direction of the paper.
The steel cord 12 extends along the longitudinal direction of the main rubber 11, and a plurality of steel cords 12 are arranged at intervals in the width direction. The end portion 13 of the steel cord 12 protrudes outward from the end edge 14 of the main rubber 11 in the longitudinal direction, and the end portions 13 of both steel cords 12 of both rubber elastic bodies 15 protrude in parallel with each other.

  As shown in FIG. 2, the steel cord 12 is formed by twisting a large number of filaments 17a and 17b (wires). In this embodiment, the steel cord 12 is twisted so that a plurality of sheath filaments 17b form one or more sheath layers 19 around a core portion 18 formed by twisting a plurality of core filaments 17a. In the illustrated example, a so-called (3 + 9 + 15) structure is formed.

  And in this embodiment, as shown in FIG. 1, the end portions 13 of both steel cords 12 are in a plan view as viewed from one direction (the width direction) perpendicular to (intersect) the protruding direction of the end portions 13. The end portion 13 of one steel cord 12 and the end portion 13 of the other steel cord 12 protrude from the main rubber 11 while being periodically bent so as to be intertwined with each other and appear alternately. Both bent portions 20 at the end portions 13 of both steel cords 12 are bent so as to form a sine wave in the plan view. Further, as shown in FIG. 2, the two bent portions 20 are bent in a state where the positions in the one direction are equally maintained.

  As shown in FIGS. 1 to 3, these two bent portions 20 have the same wavelength P in the plan view, and in the illustrated example, the wire diameter d and the total amplitude A in the plan view also They are equivalent to each other, and are entangled with each other with the phase shifted in the protruding direction. In addition, the two bent portions 20 intersect each other so that the positions in the one direction are switched every fixed period shorter than one period (half period in the illustrated example) along the protruding direction in the plan view.

  Further, the bent portion 20 is configured such that first inclined portions 21a and second inclined portions 21b extending while being inclined in different directions with respect to the protruding direction in the plan view are alternately provided in the protruding direction. Has been. In the two bent portions 20, the first inclined portion 21a in the other bent portion 20 is disposed between the first inclined portions 21a adjacent to each other in the protruding direction in one bent portion 20, and one bent portion 20 In the portion 20, the second inclined portions 21b of the other bent portion 20 are entangled with each other between the second inclined portions 21b adjacent to each other in the protruding direction.

  Note that the total amplitude A of the bent portion 20 indicates the total amplitude A of the code axis O1 in the bent portion 20, and this total amplitude A is, for example, another direction (illustrated) orthogonal to both the protruding direction and the one direction. In this example, it is calculated by subtracting the wire diameter d from the molding outer diameter D, which is the distance between both end edges of the bent portion 20 along the vertical direction of the drawing. In the bent portion 20, the ratio A / d of the total amplitude A to the wire diameter d is 0.7 or more, and the ratio A / P of the total amplitude A to the wavelength P is 0.003 or more. Are intertwined with each other over a length of six periods or more along the protruding direction.

  As shown in FIG. 1, the bonding material 16 connects the end edges 14 of the two main body rubbers 11 and covers the end portions 13 of the two steel cords 12 over the entire length. As the bonding material 16, for example, a rubber material, a resin material, or the like may be employed, and further, for example, a chloroprene-based natural vulcanized rubber adhesive may be employed.

Next, an example of a method for joining rubber elastic bodies by the joining structure 10 will be described.
First, as shown in FIG. 4, when the end portion 13 of the steel cord 12 of the rubber elastic body 15 is embedded in the main body rubber 11 before joining, the main body rubber 11 is removed and the end portion 13 of the steel cord 12 is replaced. The removal process to expose is performed. At this time, the main rubber 11 may not be completely removed from the end portion 13 of the steel cord 12, and the main rubber 11 may remain on the surface of the end portion 13 of the steel cord 12. It should be noted that this step can be omitted when the end 13 of the steel cord 12 is exposed in advance.

  Further, when the steel cord 12 of the rubber elastic body 15 extends straight, for example, before joining, and the bent portion 20 is not formed, the bent portion 20 is formed as shown in FIG. A partial formation process is performed. At this time, for example, the end portions 13 of both the steel cords 12 are pressed from the other direction by a plate material having a concavo-convex portion formed on the surface, or passed between a pair of gears rotating around the rotation axis along the one direction. The bent portion 20 may be formed by, for example. At this time, the bent portions 20 may be simultaneously formed on the end portions 13 of the plurality of steel cords 12. Note that this step can be omitted when the bent portion 20 is formed in advance.

  Then, as shown in FIG. 1, after performing an entanglement process in which both bent portions 20 are entangled with each other in a state where the phases are shifted in the projecting direction, an embedding step of embedding these both bent portions 20 in the bonding material 16 is performed. As a result, the rubber elastic bodies 15 are joined together by the rubber elastic body joining structure 10.

As described above, according to the rubber elastic body joining structure 10 according to the present embodiment, the end portions 13 of both the steel cords 12 and the end portion 13 of one steel cord 12 and the other steel in the plan view. Since the end portion 13 of the cord 12 is entangled with each other and protrudes alternately from the main body rubber 11, the steel cord 12 is protruded from the bonding material 16 to the rubber elastic body 15. When a pulling tension is applied, the bent portions 20 are constrained to each other, and a large compressive force is generated between the bent portions 20, and the steel cord 12 is pulled out from the bonding material 16. Can be suppressed. Thereby, for example, even when the adhesive force between the steel cord 12 and the bonding material 16 is small or the strength of the bonding material 16 is low, it is possible to suppress the steel cord 12 from being pulled out from the bonding material 16. The bonding strength can be ensured regardless of the type of the bonding material 16.
In addition, since the bonding strength can be ensured regardless of the type of the bonding material 16, the degree of design freedom can be increased. For example, when natural vulcanized rubber that can be vulcanized without being heated or pressurized by a vulcanizer is used as the bonding material 16, the end portions 13 of both steel cords 12 are not used with a vulcanizer. It is possible to vulcanize the bonding material 16 to bond the rubber elastic bodies 15 to each other, thereby simplifying the operation.

Further, in the bent portion 20, the ratio of the total amplitude A to the wire diameter d is 0.7 or more, the ratio of the total amplitude A to the wavelength P is 0.003 or more, and both the bent portions 20 are in the protruding direction. Therefore, the compressive force generated between the two bent portions 20 can be effectively increased, and good bonding strength can be ensured.
That is, in the bent portion 20, the ratio of the total amplitude A to the wire diameter d is less than 0.7, the ratio of the total amplitude A to the wavelength P is less than 0.003, In the case where they are entangled with each other only over a length of less than 6 periods along the protruding direction, the relative magnitude of the total amplitude A with respect to the wire diameter d and the wavelength P in the bent portion 20 is entangled with each other. Since the length of the bent portion 20 is small, it is difficult to increase the compressive force generated between the two bent portions 20, and it may be difficult to ensure good bonding strength.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above-described embodiment, the steel cord 12 is formed by twisting a large number of filaments 17a and 17b to each other. However, the present invention is not limited to this, and a single filament such as a steel cord 30 shown in FIG. 17 may be comprised. Furthermore, the steel cord may be configured by twisting a plurality of strands made of a plurality of filaments.

Moreover, in the said embodiment, although the bending part 20 shall be bent in the state by which the position of the said one direction was maintained equally, it is not restricted to this. For example, the bent portion may form a spiral around a spiral axis extending along the protruding direction. In this case, the ends of both steel cords are periodically removed from the base material so that the ends of one steel cord and the other steel cord are intertwined with each other and appear alternately in the plan view. The two bent portions are intertwined so as to form a double helix.
In this case, the pressing member is pressed while pressing a pin-shaped, roll-shaped or plate-shaped pressing member extending in a direction inclined with respect to the protruding direction on the surface of the end portion of the steel cord in the bending portion forming step. The bent portion may be formed by slidably moving the end of the steel cord by sliding in the protruding direction.
Further, in this case, and when the steel cord is formed by twisting a plurality of fine wires made of filaments or strands in a spiral manner, as shown in FIG. At the end, these thin wires may be broken and a bent portion may be formed by removing a part of the plurality of fine wires. The steel cord 40 shown in FIG. 7 has four strands 41 formed by twisting so that six sheath filaments 17b form one sheath layer 19 around one core filament 17a, and a helical axis O2. The four strands 41 are disconnected at the end 13 of the steel cord 12 and two of the four strands 41 are removed. The remaining two strands 41 constitute a bent portion 42. Here, when the bent portion 42 is constituted by a plurality of strands 41 in this way, the wire diameter d, the total amplitude A, the wavelength P, and the molding outer diameter D in the bent portion 42 constitute the bent portion 42. It refers to the wire diameter d, the total amplitude A, the wavelength P, and the molding outer diameter D of one strand 41. In addition, the said bending part may be comprised with one strand instead of several strands.

In the embodiment, the bent portions 20 and 42 are bent so as to form a sine wave in the plan view. However, the present invention is not limited to this. For example, the bent portions 20 and 42 are bent so as to form a triangular wave. Also good.
Furthermore, in the said embodiment, although the phase of both the bending parts 20 and 42 shall be shifted by the period different from a half period, it may be shifted by a half period like the joining structure 50 shown in FIG. .

  In the above embodiment, the two bent portions 20 have the wavelength P, the wire diameter d, and the total amplitude A equal to each other. However, the present invention is not limited to this. For example, only the wavelength P is equal to each other. Also good.

  In addition, it is possible to appropriately replace the constituent elements in the embodiment with known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

Next, the 1st-3rd verification test about the effect demonstrated above was implemented.
In the first verification test, joint structures of four rubber elastic bodies of Examples 1 and 2 and Comparative Examples 1 and 2 were prepared. In the joining structure of these four rubber elastic bodies, the steel cord has a so-called (3 + 9 + 15) structure as shown in FIG. 2, and the bent portion is bent with the position in the one direction being maintained equally. The same configuration was adopted. Further, as shown in Table 1 below, while the respective wire diameters and total amplitudes were made common, the wavelengths and the lengths of the intertwined bent portions were varied.

Then, the tension of pulling the steel cord from the bonding material is applied to the bonding structures of the rubber elastic bodies of Examples 1 and 2 and Comparative Examples 1 and 2, and the tension when pulled is measured. The bonding strength was evaluated based on the measurement results. In the evaluation, the ratio of the tension when the cord is pulled out with respect to the cord strength is calculated as an evaluation index, and when the evaluation index is 50 or more and the bonding strength with respect to the tension having a magnitude more than half of the cord strength is secured. It was assumed that good bonding strength was ensured.
The results are shown in Table 2 below.

  Thus, Examples 1 and 2 have an evaluation index of 50 or more, while Comparative Examples 1 and 2 have an evaluation index of less than 50. From the results of Examples 1 and 2, the ratio of the total amplitude to the wire diameter is 0.7 or more, the ratio of the total amplitude to the wavelength is 0.003 or more, and both bent portions are 6 along the protruding direction. It was confirmed that good bonding strength was ensured by being intertwined over a length equal to or longer than the period. Further, from the result of Comparative Example 1, it was confirmed that it was difficult to ensure good bonding strength when the ratio of the total amplitude to the wavelength was less than 0.003. Furthermore, from the results of Comparative Example 2, it was confirmed that it was difficult to ensure good bonding strength even when the bent portions were intertwined only with a length of less than 6 cycles.

  In the second verification test, a joining structure of two rubber elastic bodies of Example 3 and Comparative Example 3 was prepared. In the joining structure of these two rubber elastic bodies, the steel cord is composed of a single filament as shown in FIG. 6, and the bent portion is bent in a state where the position in the one direction is maintained equally. A common configuration was adopted. Further, as shown in Table 3 below, the wire diameters, the wavelengths, and the lengths of the intertwined bent portions were made common, but the total amplitude was varied.

And about the joining structure of each rubber elastic body of these Example 3 and the comparative example 3, it evaluated by the evaluation index similar to the said 1st verification test.
The results are shown in Table 4 below.

  Thus, while the evaluation index of Example 3 is 50 or more, the evaluation index of Comparative Example 3 is less than 50. From the results of Example 3, the ratio of the total amplitude to the wire diameter is 0.7 or more, the ratio of the total amplitude to the wavelength is 0.003 or more, and both bent portions are for six periods along the protruding direction. It was confirmed that good bonding strength was ensured by being entangled with each other over the above length. Further, from the result of Comparative Example 3, it was confirmed that it was difficult to ensure good bonding strength when the ratio of the total amplitude to the wire diameter was less than 0.7.

  In the third verification test, the joint structures of four rubber elastic bodies of Examples 4 to 6 and Comparative Example 4 were prepared. The joint structure of these four rubber elastic bodies employs a common construction in which the steel cord is composed of two strands as shown in FIG. 7, and the bent portion is spiral around the helical axis. did. Further, as shown in Table 5 below, the wire diameters, the total amplitudes, and the wavelengths are also common, but the lengths of the intertwined bent portions are varied.

And about the joining structure of each rubber elastic body of these Examples 4-6 and the comparative example 4, it evaluated by the evaluation index similar to the said 1st verification test.
The results are shown in Table 6 below.

  As described above, Examples 4 to 6 have an evaluation index of 50 or more, while Comparative Example 4 has an evaluation index of less than 50. From the results of Examples 4 to 6, the ratio of the total amplitude to the wire diameter is 0.7 or more, the ratio of the total amplitude to the wavelength is 0.003 or more, and both bent portions are 6 along the protruding direction. It was confirmed that good bonding strength was ensured by being intertwined over a length equal to or longer than the period. Further, from the result of Comparative Example 4, it was confirmed that it was difficult to ensure good bonding strength when the bent portions were entangled only with a length of less than 6 cycles.

10, 50 Rubber elastic body joint structure (composite joint structure)
11 Body rubber (base material)
12, 30, 40 Steel cord (reinforcing wire)
13 End 15 Rubber elastic body (composite)
16 Bonding material 20, 42 Bending part A Total amplitude d Wire diameter P Wavelength

Claims (2)

The composites formed by projecting the end portions of the reinforcing wire embedded in the base material to the outside from the base material were joined by the joining material while the end portions of both the reinforcing wire materials of these both composites were embedded. A joined structure of a composite,
The ends of the two reinforcing wire rods are alternately seen in the plan view as viewed from the direction intersecting the projecting direction of the end portions, and the end portions of the one reinforcing wire rod and the other reinforcing wire rod are intertwined with each other. A composite joining structure characterized by protruding from the base material while being periodically bent outwardly. A composite joint structure according to claim 1,
The two bent portions at the ends of the two reinforcing wires have the same wavelength in the plan view,
In the bent portion, the ratio of the total amplitude in the plan view with respect to the wire diameter is 0.7 or more, and the ratio of the total amplitude to the wavelength is 0.003 or more,
The joint structure of a composite body, wherein the two bent portions are intertwined with each other over a length of six cycles or more along the protruding direction.

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