JP3265551B2 - Method for producing rubber crawler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel method for producing a rubber crawler, and more particularly, to a method for producing a rubber crawler using a ring-shaped tensile body as it is.

[0002]

2. Description of the Related Art In recent years, rubber crawlers have been widely used not only for traveling parts of agricultural equipment but also for traveling parts of construction machines and civil engineering machines. Since an extremely large tension is applied to the rubber crawler, tensile members represented by steel cords are embedded in the rubber crawler in a row.

FIGS. 1 and 2 are partial views showing an example of a conventional method of manufacturing a rubber crawler. This tensile member row is endless as a first step as shown in FIG. A rubber lug 2 and the like are vulcanized and molded in molds 5 and 6 while leaving both ends thereof, and then, as a second step, these ends are overlapped as shown in FIG. This is filled with new rubber 3 and vulcanized to form an endless rubber crawler. Reference numeral 4 denotes a metal core embedded at a constant pitch in a rubber crawler. However, the portion where the tensile member rows are overlapped has extremely high rigidity, and the rubber crawler as a whole is extremely unbalanced. For this reason, when the rubber crawler is used in, for example, a traveling section of a construction machine, the traveling does not rotate smoothly, causing vibration, and insufficient quality control of the joint section.
It has been pointed out that this causes premature cutting of the rubber crawler.

Therefore, it is preferable that the tensile member row embedded in the rubber crawler is previously formed in a ring shape. However, a method of manufacturing a rubber crawler with the annular tensile member line is disclosed in Japanese Utility Model Laid-Open No. 57-174287. It is proposed in the gazette. One of them is to use a mold for manufacturing rubber crawlers as shown in FIG. 6 of the above-mentioned gazette. However, this method is expensive and impractical. Moreover, many rubber crawlers have different circumferential pitches,
The big question is how to deal with this.

On the other hand, as shown in FIG. 8 of the above-mentioned publication, there is a method in which a rubber lug or the like is partially vulcanized with respect to a tensile member row, and FIG. 3 schematically shows the method. However, a large number of metal cores 4 are usually buried in the rubber crawler, and the metal cores 4 are surrounded by the tensile body row 1. Such a cored bar 4 may have a weight of several kilograms.
The problem is how to set the core metal in the field.

That is, in FIG. 3, when rubber is vulcanized and molded in the molds 5 and 6 with the tensile body row 1 interposed therebetween,
Mode - the rubber in a state where the projections 4 ₁ of the core 4 against the recess 5 ₁ of field 5 is fitted is vulcanized, vulcanization is performed while maintaining a nearly complete arrangement. On the other hand,
Although the vulcanization molding in the molds 7 and 8 is illustrated in the above publication as being easily molded, in practice, this molding is almost impossible. The reason is that the heavy metal core 4 is separated from the mold 7, and the position of the metal core 4 cannot be held as it is during vulcanization, and is not arranged at a predetermined position after vulcanization molding. It is because.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a new technique of a split vulcanization method for producing a rubber crawler by the latter method of the prior art.

[0008]

SUMMARY OF THE INVENTION According to the present invention, there is provided a method of manufacturing a rubber crawler, wherein a core metal arranged at a constant pitch and a tensile member row surrounding the core are embedded in rubber. In a manufacturing method, a release plate is disposed at a portion where the tensile member row is buried, and further, an inner peripheral member and an outer peripheral member of a rubber crawler are disposed with respect to the tensile member row. Thereafter, the mold is molded in the mold, the release plate is removed, and the rubber-stretched tensile member row is set at the position of the release plate. Thereafter, the rubber is pressed under pressure in the mold. The present invention relates to a method for producing a rubber crawler, which comprises vulcanizing.

[0009] Preferably, the present invention relates to a method for producing a rubber crawler in which the tension member row is formed in a ring shape, and the ring-shaped tension member row is partially vulcanized sequentially with rubber. The inner and outer molds forming the inner peripheral surface and the outer peripheral surface are opened in the horizontal direction, and after the tensile body row is inserted from the vertical direction, the mold is closed and the rubber claw is formed by rubber pressure vulcanization.
It is intended to provide a method for producing a rubber.

More specifically, an inner mold forming the inner peripheral surface of the rubber crawler is placed upward, and a release plate is selected on this inner mold instead of the tensile body row. All the members constituting the rubber crawler are placed, then the outer mold forming the outer peripheral surface of the rubber crawler is placed, and the inner and outer molds are set up vertically, and all the space between the inner and outer molds is put between them. The rubber cloth is characterized in that the material is pressurized, the inner and outer molds are opened, the release plate is removed, a row of tensile members is inserted into this part, the inner and outer molds are closed again, and vulcanization is performed under pressure. More specifically, the present invention relates to a method of manufacturing a rubber crawler in which a pair of inner molds are effectively used, and a pair of inner molds are vertically opposed to each other.

In the present invention, the row of tensile members is usually one in which steel cords are arranged in a row, and it is preferable that these are arranged in a ring. Here, a ring is one by one.
The book includes a ring-shaped book and a spiral book. And the tensile body row is unvulcanized rubber from both sides.
It is usually done.

[0012]

According to the present invention, the release plate is disposed at the portion of the tensile member row buried in the rubber crawler, and all the members constituting the rubber crawler are reserved in the inside and outside molds. Pressurize,
The rubber material constituting the inner and outer surfaces of the rubber crawler is adhered to the inner and outer mold surfaces, and in this state, the inner and outer molds are opened, the release plate is removed, and a row of tensile members is inserted therein. The mold is closed and vulcanized under pressure to obtain a rubber crawler. Therefore, it is possible to insert the annular tensile body row as it is at the position where the release plate was located.

More specifically, if the inner and outer molds are set up vertically and then opened, and the tensile member row is inserted at the position where the release plate was located, the rubber cloth by the annular tensile member row can be used.
Is easier to manufacture. In particular, when two sets of inner and outer molds are used, and the inner mold sides are vertically opposed with the inner mold sides facing each other, it is possible to insert the annular tensile member rows into both sets at the same time, which is extremely advantageous in manufacturing. It will be.

In the present invention described above, the rubber material adheres to the inner and outer mold surfaces having a complicated surface shape, so that even if both molds are opened, they do not collapse.
The release plate can be easily removed, and even if it is a heavy metal core, it will not fall off by physically biting it into the rubber material and its position will be maintained Will be. When pressurizing the inside and outside molds with the release plate in between, heating to some extent (about 10
(0 ° C to 120 ° C) in some cases.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 4 to 8 are schematic views showing the state of a vulcanization molding apparatus and various members used when carrying out the present invention. FIG. 4 shows inner and outer molds 11 for molding a rubber crawler.
FIG. 12 is a diagram of a first step in which the hinges 12 are horizontally extended right and left with hinges, and are arranged side by side in pairs. Various members are placed on the respective mold surfaces on the inner and outer mold surfaces 11 and 12 with the steel cord line as a tensile member line as a boundary.

That is, a roller rubber 21, a core metal 22, and an intermediate rubber 23 are provided on the inner mold 11 surface which forms the inner peripheral surface side of the rubber crawler with the outer mold which forms the outer peripheral surface side of the rubber crawler. −
A cap rubber 24 mainly forming a rubber lug is placed on the surface of the screen 12.

Then, after the release plates 25, 25 are placed thereon and temporarily fixed thereon, as a second step, the release plates 25 are rotated 90 degrees with a hinge as shown in FIG.
5 and 25 are opposed to each other. Then, as a third step, the release plates 25 are brought into contact with each other and pressurized.
FIG. 6 shows an example of this pressurized state. That is, the central pressure-resistant material 31 is inserted into the pair of inner molds 11, 11, and the outer molds 12, 12 are pressed from the outside by the cylinders 32, 32, and the inner and outer molds 11, 12 are pressed. The various members are pressed and adhered to the surface. Note that the central pressure-resistant material 31 and the pressing material 33 provided at the tip of the cylinder 32 each have a heating device incorporated therein, and this is an example in which the vulcanization molding device is used as it is.

However, as a fourth step, as shown in FIG. 7, the pressure in the cylinder 32 is released, the inner and outer molds 11, 12 are opened, and the release plates 25, 25 are removed. At this time, the rolling rubber 21 and the intermediate rubber 2
3 is attached to the inner mold 11 surface by biting into the rubbers 21 and 23, while the cap rubber 24 is attached to the outer mold 12 surface. This will not fall off.

As a fifth step, while keeping the inner and outer molds 11, 12 and various members in this state, a steel code row 26 is placed at the position where the release plate 25 is located as shown in FIG. insert. The steel cord row 26 has an annular shape and is tightened by a rotating arm 34.
Then, it is lowered from above, and the steel cord row 26 is placed at the position of the release plate 25. Thereafter, the inner and outer molds 11, 12 are closed again by the cylinder 32, and vulcanization molding is performed in this state.

FIG. 9 is a side view showing a state in which the steel cord row 26 and rubber are vulcanized and molded, and FIG. 10 is a top view thereof. That is, in this example, rubber is vulcanized inside and outside of the steel cord row 26 by the inside and outside molds 11 and 12 to form quarters of the rubber crawler. As shown in FIG. 11, the rotating arm 34 rotates the steel cord row 26 by a quarter of its length.
The rubber is vulcanized inside and outside of the steel cord row 26 again to complete the rubber crawler.

[0021]

According to the present invention, it is possible to produce a rubber crawler having an annular tensile body row.
There is no longer any portion where the tensile body row is doubled to make it endless as in the past, and the uniformity of the rubber crawler is improved, so that the properties of the rubber crawler are improved and durable. Performance is improved. Also, since rubber can be vulcanized and molded to any length and at any position on the inside and outside of the steel cord row, the mold can be reduced in size and the number of mold surfaces can be reduced. There is an advantage.

[Brief description of the drawings]

FIG. 1 is a schematic view of a first step showing a conventional method for producing a rubber crawler.

FIG. 2 is a schematic view of a second step of the method of manufacturing the rubber crawler shown in FIG.

FIG. 3 is a schematic view of a method of split vulcanization proposed in Japanese Utility Model Laid-Open No. 57-174287.

FIG. 4 is a first step diagram of a vulcanization molding apparatus used in carrying out the present invention, and is a diagram in which the inside and outside molds are horizontally spread horizontally.

FIG. 5 is a second step diagram of the vulcanization molding apparatus shown in FIG. 4, in which the inside and outside molds are rotated by 90 degrees to be upright.

FIG. 6 is a third step diagram of the vulcanization molding apparatus shown in FIG. 4, and is a view showing a pressurized state of the inside and outside molds.

FIG. 7 is a fourth step diagram of the vulcanization molding apparatus shown in FIG. 4, in which a cylinder is released.

FIG. 8 is a fifth step diagram of the vulcanization molding apparatus shown in FIG. 4, in which a steel cord row is inserted into a portion where a release plate is located.

FIG. 9 is a side view of a steel cord row and rubber vulcanized according to the present invention.

FIG. 10 is a top view of FIG. 9;

FIG. 11 is a top view in which the steel cord row is rotated by a quarter to further vulcanize and mold rubber on the steel cord row.

[Description of Signs] 1) Tensile body row, 2) Rubber lug, 3) New filling rubber, 4) Core bar, 4 ₁₎ Core bar protrusion, 5, 6, 7, 8 -Mold, 51 ₁ Mold recess, 11 ‥‥ Inner mold, 12 ‥‥ Outer mold, 21 ‥‥ Wheel rubber, 22 ‥‥ Core, 23 、 Intermediate rubber, 24 ‥‥ Cap rubber, 25 ° release plate, 26 ° steel cord row, 31 ° central pressure resistant material, 32 ° cylinder, 33 ° pressing material, 34 ° rotating arm.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ identification symbol FI B29K 105: 24 B29K 105: 24 (58) Investigated field (Int.Cl. ⁷ , DB name) B29D 31/00 B62D 55/253 B62D 55/32

Claims (6)

(57) [Claims] 1. A metal core arranged at a constant pitch,
A method of manufacturing a rubber crawler, wherein a tensile member row surrounding the tension member row is embedded in rubber, a release plate is disposed at a portion where the tensile member row is embedded, and the tensile member row is further provided. After arranging the inner and outer peripheral members of the rubber crawler,
The mold is molded in the mold, then the release plate is removed, and the rubber-stretched tensile member row is set at the position of the release plate, and then the rubber is vulcanized under pressure in the mold. A method for producing a rubber crawler. 2. The method according to claim 1, wherein the tensile member row is annular. 3. The method for producing a rubber crawler according to claim 1, wherein rubber is partially and sequentially vulcanized to the annular tensile body row. 4. The inner and outer molds forming the inner peripheral surface and the outer peripheral surface of the rubber crawler are opened in the horizontal direction, and after the tensile member row is inserted from the vertical direction, the mold is closed and the rubber member is closed. 4. The method for producing a rubber crawler according to claim 1, which is performed by pressure vulcanization. 5. An inner mold for forming an inner peripheral surface of a rubber roller.
The mold is placed upward, a release plate is selected on the inner mold instead of the tensile body row, and all the members constituting the rubber crawler are placed, and then the outer peripheral surface of the rubber crawler is formed. And put the inside and outside molds vertically,
During this time, all the members between the inner and outer molds are pressurized, then the inner and outer molds are opened, the release plate is removed, a tensile body row is inserted into this part, the inner and outer molds are closed again, and pressure is applied. A method for producing a rubber crawler, comprising vulcanizing. 6. The method for producing a rubber crawler according to claim 5, wherein a pair of inner molds is used, and the two inner molds are vertically opposed to each other.