JP2019119431A - Method for production of core material - Google Patents

Abstract

To provide a method for production of a core material for improving the durability of a rubber crawler.SOLUTION: There is provided a method for production of a core material 3 embedded in an endless belt-like crawler body 2 comprising an unvulcanized rubber. The method includes: a molding process S1 of molding the core material 3 having a pair of trank roller passing faces 8a through which the trank rollers of a vehicle pass when the rubber crawler 1 including a crawler body 2 and the core material 3 are mounted to the vehicle; a coating process S2 of coating an adhesive on the molded core material 3; and a drying process S3 of drying the core material 3 on which the adhesive is coated. In the coating process S2, the adhesive is applied in such a state as fixing the core material 3 using a portion 7a located between the pair of trank roller passing faces 8a of the core material 3.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a method for manufacturing a core material embedded in an endless belt-like crawler body.

  BACKGROUND Conventionally, rubber crawlers are known that are vulcanized and molded after a core material is embedded in a crawler body made of unvulcanized rubber. The core material embedded in the crawler body is coated in advance with an adhesive on its surface in order to improve the adhesion to rubber during vulcanization molding. The following Patent Document 1 proposes a method for producing a core material in which a top-coating adhesive is applied after the base material is applied to the core material.

  FIG. 10 is a plan view showing a core material 100 in a conventional application process such as Patent Document 1. As shown in FIG. As shown in FIG. 10, in the method of manufacturing core material 100 of Patent Document 1, a coating step of applying an adhesive to core material 100 is performed. In the coating process, for example, the core material 100 is aligned on the fixing member 101 such as a wire mesh and dipped in a tank (not shown) filled with an adhesive.

  Moreover, in the manufacturing method of the core material of patent document 1, the drying process which dries the core material 100 to which the adhesive agent was apply | coated was performed after the application process. Also in the drying step, as in the coating step, the core material 100 is dried in a state where the core material 100 is aligned on the fixing member 101 such as a wire mesh.

JP 2001-162536 A

  However, in the method of manufacturing the core material of Patent Document 1, the adhesive is accumulated in a portion where the core member 100 is in contact with the fixing member 101, and the thickness of the adhesive in this portion is greater than the thickness of the adhesive in the other portion. Could even grow. Such a thick portion of the adhesive reduces the holding strength of the crawler main body by the core material 100, and may be a starting point of breakage of the rubber crawler.

  Further, in the drying step, in the drying process, the adhesive is fixed to the fixing member 101 side, and the adhesive of the core material 100 may be peeled off. Such a peeled portion of the adhesive is not adhered between the crawler main body and the core member 100, and there is a possibility that it becomes a starting point of breakage when using the rubber crawler. For this reason, the rubber crawler using the core material 100 manufactured by the method of patent document 1 had the problem that the durability fell.

  The present invention has been made in view of the above-described actual situation, and its main object is to provide a method of manufacturing a core material for improving the durability of a rubber crawler.

  The present invention is a method of manufacturing a core material embedded in an endless belt-like crawler body made of unvulcanized rubber, and when a rubber crawler including the crawler body and the core material is mounted on a vehicle, A molding process for molding the core material having a pair of roller wheel passing surfaces through which the rolling wheels of the vehicle pass; a coating process for applying an adhesive to the molded core material; And a drying step of drying the core material, wherein the coating step applies the adhesive in a state in which the core material is fixed using a portion located between the pair of roller passing surfaces of the core material. It is characterized by

  In the method of manufacturing a core material according to the present invention, the core material includes a core material main body located between the pair of roller passing surfaces in the crawler width direction, and the part is the crawler inner periphery of the core material main body. It is desirable to be the side.

  In the core material manufacturing method of the present invention, the core material includes a pair of corner portions positioned between the pair of roller passing surfaces in the crawler width direction, and the portion is a crawler of the pair of corner portions. It is desirable to be on the inner side.

  In the method for producing a core material of the present invention, the applying step includes a first applying step for applying a first adhesive and a second applying for applying a second adhesive different from the first adhesive. It is desirable to include a process.

  In the method of manufacturing a core material of the present invention, in the applying step, it is preferable that the portion of the core material be fixed using an electromagnet.

  In the method of manufacturing the core material of the present invention, in the coating step, the adhesive is applied in a state where the core material is fixed using a portion positioned between the pair of roller passing surfaces of the core material. In the method of manufacturing such a core material, the thickness of the adhesive becomes uneven because the adhesive may accumulate only at the portion positioned between the pair of roller passing surfaces of the core material. Possible locations are limited. In addition, even if this portion is broken when using the rubber crawler, the possibility of breakage of the entire rubber crawler is low. For this reason, the manufacturing method of the core material of the present invention can improve the durability of the rubber crawler.

It is a perspective view which shows the rubber crawler containing the core material manufactured by the manufacturing method of the core material of this embodiment. It is a perspective view of the core material of FIG. It is a flowchart which shows the manufacturing method of the core material of this embodiment. It is a top view which shows the core material of a coating process. It is a perspective view which shows the core material of the application | coating process of FIG. It is a perspective view which shows the core material of the application | coating process by another fixing member. It is a flowchart which shows the manufacturing method of the core material of other embodiment. It is a top view of the core material which shows the core material of the application | coating process of other embodiment. It is a perspective view which shows the core material of the application | coating process of FIG. It is a top view which shows the core material of the conventional application process.

Hereinafter, an embodiment of the present invention will be described in detail based on the drawings.
FIG. 1 is a perspective view showing a rubber crawler 1 including a core 3 manufactured by the method of manufacturing a core 3 according to the present embodiment. As shown in FIG. 1, the rubber crawler 1 according to the present embodiment includes a crawler main body 2 formed in an endless belt shape, and a plurality of core members 3 embedded in the crawler main body 2 at intervals in the crawler circumferential direction a. And a tensile body 4 embedded in the crawler body 2.

  In the present specification, the crawler circumferential direction is the rotation direction of the rubber crawler 1 and corresponds to the direction indicated by the symbol a in FIG. The crawler width direction is the axial direction of the drive wheel when the rubber crawler 1 is mounted on the vehicle, and corresponds to the direction indicated by the symbol b in FIG. Furthermore, the crawler thickness direction is a direction orthogonal to the crawler circumferential direction a and the crawler width direction b, and corresponds to the direction indicated by the symbol c in FIG. The inner side of the endless belt-shaped rubber crawler 1 in the crawler thickness direction c is the crawler inner circumferential side ci. Further, the outer side of the endless belt-shaped rubber crawler 1 is a crawler outer peripheral side co.

  As shown in FIG. 1, the crawler main body 2 of this embodiment is made of rubber and has a substantially constant width in the crawler width direction b. The crawler body 2 has an outer peripheral surface 2 o of the crawler outer peripheral side co and an inner peripheral surface 2 i of the crawler inner peripheral side ci. It is desirable that a plurality of lugs 5 protruding on the outer circumferential surface co of the crawler body 2 be formed on the outer circumferential surface 2 o of the crawler body 2 at substantially equal intervals in the circumferential direction a of the crawler.

  It is desirable that a plurality of projections 6 protruding on the inner circumferential surface ci of the crawler body 2 be formed at substantially equal intervals in the crawler circumferential direction a on the inner circumferential surface 2i of the crawler body 2. The inner peripheral surface 2i of the crawler body 2 of the present embodiment is a pair of roller passing surfaces through which the wheels of the vehicle pass when the rubber crawler 1 is mounted on the vehicle outside the crawler width direction b of the projections 6. It has 2a.

  The tensile body 4 includes, for example, a plurality of metal cords 4 a extending in the crawler circumferential direction a. In the tensile body 4 of the present embodiment, the metal cords 4 a are formed side by side in the crawler width direction b. The tensile body 4 is embedded, for example, on the crawler outer peripheral side co than the core material 3 of the crawler main body 2 and extends along the crawler circumferential direction a.

  FIG. 2 is a perspective view of the core 3 of FIG. As shown in FIG. 1 and FIG. 2, the core material 3 of the present embodiment is desirably made of a hard material harder than rubber. The core 3 is made of, for example, a metal material such as steel or cast iron. The core 3 of the present embodiment protrudes toward the crawler inner circumferential side ci between the core main body 7, the pair of wings 8 extending from the core main body 7 in the crawler width direction b, and the pair of wings 8. And a pair of corners 9 are included. It is desirable that the corner 9 of the core 3 be embedded inside the projection 6 of the crawler main body 2.

  The wing portion 8 of the core 3 of the present embodiment has a pair of wheel passing surfaces 8a through which the wheels of the vehicle pass when the rubber crawler 1 is mounted on the vehicle. It is desirable that the roller passing surface 8 a of the core material 3 be located on the crawler outer peripheral side co of the pair of roller passing surfaces 2 a of the crawler body 2.

  The roller passing surface 8 a of the core material 3 is preferably located outside the crawler width direction b of the corner portion 9 and on the crawler inner circumferential side ci. For this reason, the core material 3 of the present embodiment includes the core material main body 7 and the pair of corner portions 9 positioned between the pair of roller wheel passing surfaces 8 a in the crawler width direction b.

Next, the manufacturing method of the core material 3 of this embodiment is demonstrated, considering FIG.1 and FIG.2.
FIG. 3 is a flowchart of the method of manufacturing the core 3 of the present embodiment. As shown in FIG. 3, in the method of manufacturing the core material 3 of the present embodiment, a molding step S1 of molding the core material 3 is performed. In the forming step S1, for example, the core material 3 is formed by pouring a metal material which has been heated to a temperature higher than the melting point to be in a liquid state into a mold.

  The manufacturing method of core material 3 of this embodiment performs application process S2 which applies adhesives to core material 3 fabricated by molding process S1. In application | coating process S2, in the state which fixed the core material 3, for example, it is made to immerse in the tank (illustration omitted) filled with the adhesive agent. In such a coating step S2, the adhesive can be uniformly applied to the entire core material 3.

  FIG. 4 is a plan view showing the core 3 in the application step S2, and FIG. 5 is a perspective view showing the core 3 in the application step S2 of FIG. As shown in FIGS. 4 and 5, in the coating step S2 of the present embodiment, in a state where the core material 3 is fixed using the portion 7a located between the pair of roller passing surfaces 8a of the core material 3, Adhesive is applied.

  In the method of manufacturing such a core 3, since the adhesive is likely to be accumulated is only the portion 7a located between the pair of roller passing surfaces 8a of the core 3, the thickness of the adhesive is Positions that may become uneven are limited. Further, even if the portion 7a is broken when the rubber crawler 1 is used, the possibility that the entire rubber crawler 1 will be broken is low. For this reason, the manufacturing method of core material 3 of the present invention can improve the endurance of rubber crawler 1.

  The portion 7 a to which the core 3 of the present embodiment is fixed is the crawler inner circumferential side ci of the core 7. The crawler inner circumferential side ci of the core body 7 which is such a portion 7a is less required to be covered with rubber, and the rubber crawler 1 can be used without any problem even if it is broken when the rubber crawler 1 is used. For this reason, even if the thickness of the adhesive of this part 7a is uneven, the durability of the rubber crawler 1 is not affected, and as a result, the durability of the rubber crawler 1 can be improved.

  The core 3 is fixed by, for example, a fixing member 10. The fixing member 10 desirably fixes the crawler inner circumferential side ci of the core body 7 which is the portion 7 a of the core 3 from the lower side of the core 3. Such a fixing member 10 has a simple structure and has few troubles such as a failure, so the manufacturing cost of the core 3 can be reduced.

  FIG. 6 is a perspective view showing the core 3 of the application step S2 by the other fixing member 11. As shown in FIG. As shown in FIG. 6, in the coating step S2, the crawler inner circumferential side ci of the core body 7 that is the portion 7 a of the core 3 may be fixed using an electromagnet that is the fixing member 11. Such a fixing member 11 can support the core 3 reliably.

  As shown in FIG. 3, in the method of manufacturing the core material 3 of the present embodiment, a drying step S3 of drying the core material 3 to which the adhesive is applied in the application step S2 is performed. In the drying step S3, as in the coating step S2 as shown in FIGS. 4 to 6, it is desirable to dry the core 3 in a state of being fixed by the fixing members 10 and 11. By such drying step S3, the adhesive applied to the core 3 can be stably maintained without peeling off in the subsequent steps.

  The core material 3 manufactured by the above-described method for manufacturing the core material 3 is then embedded in the endless belt-like crawler body 2 made of unvulcanized rubber and vulcanized to form the rubber crawler 1. Since the core material 3 of the present embodiment is coated with the adhesive uniformly, the core material 3 and the crawler main body 2 are efficiently bonded at the time of vulcanization.

  FIG. 7 is a flowchart of a method of manufacturing the core material 3 of another embodiment. As shown in FIG. 7, in the method of manufacturing the core material 3 of this embodiment, as in the above-described embodiment, a molding step S1 for molding the core material 3 and application of an adhesive to the molded core material 3 Coating step S2 and drying step S3 for drying the core material 3 to which the adhesive is applied. Also in this embodiment, as in the above-described embodiment, it is desirable that the coating step S2 and the drying step S3 be performed in a state in which the core 3 is fixed by the fixing members 10 and 11.

  The application step S2 of this embodiment includes a first application step S21 for applying a first adhesive, and a second application step S22 for applying a second adhesive different from the first adhesive. There is. Such a coating step S2 can apply a two-component adhesive. The two-component adhesive can more strongly bond the core 3 made of a metal material and the crawler main body 2 made of a rubber. In this application step S2, since the core material 3 is fixed only by the portion 7a to which the core material 3 is fixed, even if more adhesive is accumulated in the first application step S21 and the second application step S22, adhesion is performed. The position where the thickness of the agent may be uneven is limited.

  The drying step S3 of this embodiment includes a first drying step S31 of drying the core 3 after the first application step S21, and a second drying step S32 of drying the core 3 after the second application step S22. Contains. Since the first drying step S31 is performed after the first application step S21, the drying step S3 is performed by immersing the second application step S22 in a tank (not shown) filled with the second adhesive. Also, there is no possibility that the first adhesive mixes in the second adhesive tank.

  FIG. 8 is a plan view showing the core material 3 in the application step S2 of another embodiment, and FIG. 9 is a perspective view showing the core material 3 in the application step S2 of FIG. As shown in FIGS. 8 and 9, in the coating step S2 of this embodiment, in a state in which the core material 3 is fixed using the portion 9a located between the pair of roller passing surfaces 8a of the core material 3, Adhesive is applied.

  The fixed portion 9 a of the core 3 in this embodiment is the crawler inner circumferential side ci of the pair of corner portions 9. The crawler inner circumferential side ci of the pair of corner portions 9 which is such a portion 9a is less required to be covered with rubber, and even if it is broken when using the rubber crawler 1, the rubber crawler 1 can be used without any problem . For this reason, even if the thickness of the adhesive in this portion 9a is uneven, the durability of the rubber crawler 1 is not affected, and as a result, the durability of the rubber crawler 1 can be improved.

  The core material 3 of this embodiment is fixed by a pair of fixing members 12. The fixing member 12 desirably fixes the pair of corner portions 9 which are the portions 9 a of the core material 3 from below the core material 3. Such a fixing member 12 has a simple structure and has few troubles such as a failure, so the manufacturing cost of the core 3 can be reduced. The pair of fixing members 12 may be, for example, electromagnets.

  As mentioned above, although the especially preferable embodiment of this invention was explained in full detail, this invention can be deform | transformed into a various aspect, and can be implemented, without being limited to the above-mentioned embodiment.

1 rubber crawler 2 crawler main body 3 core material 7a portion 8a roller wheel passing surface S1 forming process S2 application process S3 drying process

Claims (5)

A method of manufacturing a core material embedded in an endless belt-like crawler body made of unvulcanized rubber, comprising:
A molding step of molding the core material having a pair of roller passing surfaces through which the rolling wheels of the vehicle pass when a rubber crawler including the crawler body and the core material is mounted on the vehicle;
Applying an adhesive to the molded core material;
And d) drying the core material coated with the adhesive.
In the applying step, the adhesive is applied in a state in which the core material is fixed using a portion located between the pair of roller passing surfaces of the core material.
Method of manufacturing core material. The core includes a core body located between the pair of roller passing surfaces in the crawler width direction,
The method according to claim 1, wherein the portion is a crawler inner circumferential side of the core body. The core material includes a pair of corner portions positioned between the pair of roller passing surfaces in the crawler width direction,
The method according to claim 1, wherein the portion is an inner circumferential side of the pair of corner portions of the crawler.   The application step includes a first application step for applying a first adhesive and a second application step for applying a second adhesive different from the first adhesive. The manufacturing method of the core material in any one of.   The method for producing a core material according to any one of claims 1 to 4, wherein in the applying step, the portion of the core material is fixed using an electromagnet.

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