JP5026206B2 - Rubber crawler manufacturing method and mold for molding - Google Patents

Description

  The present invention relates to a manufacturing method of a rubber crawler to be mounted on a construction machine such as a hydraulic excavator, an agricultural machine such as a combine or a tractor, and other crawler type vehicles, and a mold for molding the rubber crawler. It is something that is often manufactured.

  A traveling body of a crawler type vehicle is a rubber band between a sprocket type driving wheel connected to driving means such as a hydraulic motor and a driven wheel rotatably supported by a frame of the vehicle. Is wound endlessly, and the belt-like body is rotated between the driving wheel and the driven wheel, thereby enabling traveling on rough terrain.

The rubber crawler has only a reinforcing layer without a cored bar and a metal reinforcing type in which the cored bar is embedded and fixed in the rubber layer together with the reinforcing layer, depending on the applicable machine body (excavator, agricultural machine, industrial machine, tractor, paving machine, etc.) Each of these is divided into a ply reinforcement type, etc., but each has a plurality of drive projections linked to the drive wheels (sprockets, etc.) of the fuselage on the inner peripheral wall of the crawler (for example, Patent Documents) 1).
JP 2002-127267 A

  By the way, the crawler drive projections are conventionally molded separately in advance by a flat press and an injection method, and when the rubber crawler is manufactured, the projections are manually set one by one on the inner mold. In addition, there is a temperature difference between the drive protrusion and other rubber members (inner rubber, outer rubber, etc.) (the drive protrusion is molded separately in advance, so it is set in the mold) The protrusions have a lower temperature than other rubber members.) Therefore, a long time was required for molding the crawler (long vulcanization time), and there was a problem in that efficient production was not possible.

  An object of the present invention is to propose a novel manufacturing method and a vulcanization molding die capable of solving the above-described conventional problems that have occurred during the manufacture of rubber crawlers.

The present invention includes an inner rubber sheet that forms an inner peripheral wall of a crawler, an embedded member that forms a reinforcing layer, and an outer rubber sheet that forms a grounding portion between an inner mold and an outer mold that matches the inner mold. In order to produce rubber crawlers by sequentially laminating and pressing, vulcanizing and molding,
A mold having a plurality of cavities connected to the inner surface of the inner rubber and arranged at intervals around the inner mold is provided in the inner mold, and rubber materials are supplied and filled in the cavities of the mold, respectively. Thus, a rubber crawler manufacturing method is characterized in that a convex portion for a driving projection integrated with an inner rubber sheet is formed.

Further, the present invention comprises an inner mold and an outer mold that fits the inner mold and forms a rubber crawler molding cavity therebetween.
The inner mold is provided with a drive projection forming mold that is arranged at intervals along the inner wall surface and directly forms a drive projection on the inner surface of the inner rubber sheet,
A rubber crawler vulcanization mold characterized in that the drive projection forming mold is connected to an injection pot connected to an injection pot and supplying a rubber material into the cavity of the drive projection forming mold. .

  Preferably, the inner mold is a circular mold, and the injection line has a radial arrangement that connects to a mold for forming each driving protrusion from a single injection pot.

  Since the inner mold is provided with a mold for forming drive protrusions, and a rubber material is injected into the cavity of the mold, the protrusions for the drive protrusions are integrally provided on the inner rubber sheet. No work is required, and the influence of the temperature difference of each member can be reduced, so that the vulcanization time is greatly shortened and efficient production becomes possible.

Hereinafter, the present invention will be described more specifically with reference to the drawings.
FIG. 1 is an external perspective view showing a main part of a rubber crawler belt manufactured according to the present invention.

  Reference numeral 1 in FIG. 1 denotes a belt-like body (made of a rubber member) forming the main part of the rubber crawler. This belt-like body 1 is wound endlessly between a drive wheel and a driven wheel (not shown), and an outer peripheral surface 1a forming a grounding portion by a lug or the like and a rolling wheel (not shown) are rolled. It has a peripheral surface 1b.

  Reference numeral 2 denotes a reinforcing layer embedded and fixed in the rubber member. The reinforcing layer 2 includes at least one layer 2a in which steel cords are arranged, and one or more reinforcing plies 2b formed of an organic fiber cord or the like as necessary.

  Further, 3 is a driving projection provided on the inner peripheral surface 1b of the strip 1 and this driving projection 3 is provided at the center in the width direction of the strip 1 at intervals throughout the longitudinal direction thereof. The driving force is transmitted by adapting the sprocket of the driving wheel in between.

  FIG. 2 is a diagram schematically showing a configuration of a vulcanization molding die suitable for manufacturing the rubber crawler, and FIG. 3 is a diagram showing a main part thereof in section. In the figure, 4 is an inner mold shown in an example in which a plurality of segments are combined into a circular shape, and 5 is an outer mold that matches the inner mold 4. The outer mold 5 is also a combination of a plurality of segments. Reference numeral 6 denotes a driving projection forming mold connected to the inner mold 4. The driving projection forming mold 6 has a plurality of cavities 6a spaced from the inner wall surface of the inner mold 4.

  7 is an injection pot of rubber material provided at the center of the inner mold 4, and 8 is an injection line connecting the injection pot 7 and the drive projection forming mold 6. The injection line 8 has a radial arrangement with the injection pot 7 as a base point. For example, a rubber material can be efficiently injected into the cavity of the drive projection forming mold 6 by a transfer injection method or the like. .

  In order to manufacture a rubber crawler using such a molding die, first, an inner rubber sheet that forms the inner peripheral wall of the crawler is disposed on the inner mold 4, an embedded member that forms the reinforcing layer 2, and a grounding portion. The outer rubber sheets to be formed are sequentially stacked and combined, and the outer mold 5 is combined with the inner mold 4, while the rubber material is filled into the cavity 6a of the driving protrusion forming mold 6 through the injection pot 7 and the injection line 8 to form the driving protrusion. Corresponding convex portions are formed on the inner surface of the inner rubber sheet. After that, pressurization and vulcanization may be performed under the desired conditions, and there is no need to manually place the drive protrusions that are molded in advance on the inner mold, and the drive protrusions are formed. Since the temperature of the part to be processed is not extremely different from the temperature of the other part, efficient production becomes possible.

Example In order to manufacture a crawler of size 450 × 43 × 110-KN, a conventional method for assembling drive projections that have been molded one by one, and a vulcanization mold having the configuration shown in FIG. A comparison was made of the total time taken to complete the product crawler for the adaptation methods used. As a result, in the case of the conventional method, the vulcanization time was 105 minutes, whereas in the conforming method, the vulcanization time was about 75 minutes, and it was confirmed that efficient production was possible.

  A method for efficiently producing a rubber crawler and a vulcanization mold can be provided.

It is the external appearance perspective view of the principal part which showed typically the embodiment of the rubber crawler belt manufactured according to this invention. It is the figure which showed typically the structure of the vulcanization molding die of the rubber crawler according to this invention. FIG. 3 is a view showing a cross section of the main part of FIG.

Explanation of symbols

1 Band
1a Outer surface
1b Inner peripheral surface
2 Reinforcing layer
3 Drive protrusion
4 Inner mold
5 Outer mold
6 Mold for driving projection formation
7 Injection pot
8 Injection line

Claims (3)

An inner rubber sheet that forms the inner peripheral wall of the crawler, an embedded member that forms a reinforcing layer, and an outer rubber sheet that forms a grounding portion are sequentially stacked between the inner mold and the outer mold that fits the inner mold. And pressurizing, vulcanizing and molding to produce rubber crawlers,
A mold having a plurality of cavities connected to the inner surface of the inner rubber sheet and arranged at intervals around the inner mold is installed in the inner mold, and rubber materials are supplied and filled in the cavities of the mold, respectively. A rubber crawler manufacturing method, characterized in that a convex portion for a driving projection integrated with an inner rubber sheet is formed. It consists of an inner mold and an outer mold that fits the inner mold and forms a rubber crawler molding cavity between them.
The inner mold is provided with a drive projection forming mold that is arranged at intervals along the inner wall surface and directly forms a drive projection on the inner surface of the inner rubber sheet,
A rubber crawler vulcanization mold, wherein the drive projection forming mold is connected to an injection line connected to an injection pot and supplying a rubber material into a mold cavity of the drive projection forming mold. The inner mold is a circular mold;
3. The rubber crawler vulcanization mold according to claim 2, wherein the injection line has a radial arrangement that connects to a mold for forming each driving projection from a single injection pot.

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