JPH0760869A - Production of rubber crawler - Google Patents

Abstract

PURPOSE:To enhance the properties and durability of a rubber crawler by providing a release plate to a region where an expansion element row is embedded and arranging the inner and outer peripheral side members of the rubber crawler to the expansion element row and performing embossing in a mold to remove the release plate and setting the removed release plate to the position of the release plate to vulcanize rubber. CONSTITUTION:Rotary rubbers 21, core metals 22 and intermediate rubbers 23 are placed on the surfaces 11 of the inner molds 11 forming the inner peripheral surface of a rubber crawler and cap rubbers 24 are placed on the surfaces of outer molds 12 on the outer peripheral surface side thereof. Release plates 25, 25 are placed thereon to be temporarily clamped and opposed mutually in an erected state and a member is pressed to the surfaces of the inner and outer molds 11, 12. Heaters are incorporated in both of a central pressure resistant material 31 and press materials 33. Next, the inner and outer molds 11, 12 are opened to detach the release plates 25, 25. The steel cord row 26 tensioned by rotary arms 34 is inserted in the region where the release plates 25 are positioned and the inner and outer molds 11, 12 are again closed to perform vulcanization and molding.

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 of tensile body as it is.

[0002]

2. Description of the Related Art In recent years, rubber crawlers have come to be widely used not only in running parts of agricultural machinery but also in running parts of construction machines and civil engineering machines. Since a very large tension is applied to the rubber crawler, tensile bodies represented by a steel cord are embedded in the rubber in a row inside the rubber crawler.

FIGS. 1 and 2 are partial views showing an example of a conventional method for manufacturing a rubber crawler. This tensile member array is a first step, as shown in FIG. 2 and the rubber lug 2 and the like are vulcanized and molded in the molds 5 and 6 with both ends left, and then, as a second step, the both 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 is a cored bar which is embedded in the rubber crawler with a constant pitch. However, the portion where the tensile body rows are superposed has extremely high rigidity and is extremely unbalanced as a whole rubber crawler. For this reason, when the rubber crawler is used, for example, in a running part of a construction machine, the running does not smoothly rotate, which may cause vibration, resulting in insufficient quality control of the joint part.
It has been pointed out that it causes early cutting of the rubber crawler.

Therefore, it is preferable to preliminarily form a ring of tension bodies embedded in the rubber crawler in advance. However, a method for producing a rubber crawler with a ring of tension body is described in Japanese Utility Model Publication No. 57-174287. It is proposed in the official gazette. One of them is to make a rubber crawler molding mold with a large number of split molds as shown in FIG. 6 of the above-mentioned publication, but this is expensive and impractical. Moreover, many rubber crawlers have different circumferential pitches,
How to deal with this is also a big issue.

On the other hand, as shown in FIG. 8 of the above publication, there is a method of partially dividing and vulcanizing a rubber lug or the like with respect to the tensile body row, and FIG. 3 shows an outline thereof. However, it is usual that a large number of cored bars 4 are embedded in the rubber crawler, and the cored bars 4 are surrounded by the tensile body row 1. Some of the cored bar 4 have a weight of several Kg.
A big problem is how to set the core metal in the field.

That is, in FIG. 3, when the rubber is vulcanized and molded in the molds 5 and 6 with the tensile body row 1 interposed therebetween,
Since the rubber is vulcanized in a state in which the protrusion 4 _{1 of the} cored bar 4 is fitted in the recess 5 ₁ of the mold 5, the vulcanization molding is performed while maintaining the almost complete arrangement. On the other hand,
The vulcanization molding in the molds 7 and 8 is also illustrated in the above publication so as to be easily molded, but in reality, this molding is almost impossible. The reason is that the heavy cored bar 4 is separated from the mold 7, the position of the cored bar 4 cannot be held as it is during vulcanization, and it is not arranged at a predetermined position after vulcanization molding. Because it will be.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a new technique of a split vulcanization method for producing a rubber chlora by the latter method of the prior art mentioned above.

[0008]

SUMMARY OF THE INVENTION A method of manufacturing a rubber crawler according to the present invention is a rubber crawler in which a cored bar arranged at a constant pitch and a tensile body row surrounding the cored bar are embedded in the rubber. In the manufacturing method, a mold release plate is arranged at a portion where the tensile body row is embedded, and further, an inner peripheral member and an outer peripheral member of the rubber crawler are arranged with respect to the tensile body row. After that, mold in the mold, then remove the release plate, set the rubber-trial tension body row at the position of the release plate, and then press the rubber under pressure in the mold. The present invention relates to a method for producing a rubber crawler characterized by being vulcanized.

[0009] And, preferably, the tensile body row is formed into a ring, and relates to a method for producing a rubber crawler in which rubber is partially sequentially vulcanized in the ring-shaped tensile body row, and particularly preferably, the rubber crawler is formed. The inner and outer molds forming the inner peripheral surface and the outer peripheral surface are opened in the horizontal direction, the tensile body rows are inserted from the vertical direction, and then the mold is closed, and the rubber vulcanization is carried out by rubber pressure vulcanization.
A method for manufacturing la is provided.

More specifically, the inner mold forming the inner peripheral surface of the rubber crawler is placed upward, and a mold release plate is selected on the inner mold instead of the tensile body row. Place all the members that make up the rubber crawler, then place the outer mold that forms the outer peripheral surface of the rubber crawler, stand the inner and outer molds vertically, and in the meantime, set the entire space between the inner and outer molds. A rubber claw characterized by pressurizing the material, then opening the inner and outer molds, removing the release plate, inserting a tensile body row at this site, closing the inner and outer molds again, and vulcanizing under pressure. The present invention relates to a method for manufacturing a rubber crawler in which a pair of inner molds are used and which are opposed to each other and are vertically erected.

The tension body row in the present invention is usually one in which steel cords are arranged in a row, and it is preferable to arrange these in an annular shape. The ring here is 1
Includes books that are ring-shaped and spiral. And the tensile body row is made of unvulcanized rubber from both sides.
It is normal that the

[0012]

According to the present invention, a release plate is arranged at the position of the tensile body row embedded in the rubber crawler, and all the members constituting the rubber crawler are preliminarily protected by the inner and outer molds. Pressurize,
The rubber material that composes the inner and outer surfaces of the rubber crawler is attached to the inner and outer mold surfaces, and in this state, the inner and outer molds are opened and the mold release plate is removed. The rubber is obtained by closing the mold and vulcanizing it under pressure. Therefore, the ring-shaped tensile body row can be directly inserted into the position where the release plate was present.

Furthermore, if the inner and outer molds are set up vertically and then opened, and the tensile body row is inserted at the position where the mold release plate was located, the rubber claws formed by the annular tensile body row are used.
La becomes easier to manufacture. In particular, when two sets of inner and outer molds are used and the inner mold sides are made to face each other and stand upright, it is possible to insert the annular tensile body rows into both sets at the same time, which is extremely advantageous in manufacturing. Will be things.

According to the present invention as described above, the rubber material is attached to the inner and outer mold surfaces having a complicated surface shape so that even if both the molds are opened, they do not collapse.
The release plate can be easily removed, and even if the core metal has a heavy weight, it will not fall off by physically digging into the rubber material and its position will be maintained. It will be. It should be noted that when the inner and outer molds are pressed by sandwiching the release plate, they are heated to some extent (about 10
In some cases, it may be better to set the temperature to 0 ° C to 120 ° C.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the drawings. 4 to 8 are schematic views showing the states of the vulcanization molding apparatus and various members used in carrying out the present invention. FIG. 4 shows an inner and outer mold 11 for molding a rubber crawler,
It is a figure of the 1st step which expanded 12 horizontally to the left and right with a hinge, and this is installed side by side in a pair. Then, the inner and outer surfaces of the molds 11 and 12 are bounded by a series of tensile cords, which are tensile body arrays, and various members are mounted on the respective mold surfaces.

That is, on the surface of the inner mold 11 forming the inner peripheral surface side of the rubber crawler, the roller rubber 21, the core metal 22, and the intermediate rubber 23 are provided, and the outer mold forming the outer peripheral surface side of the rubber crawler. −
Cap rubbers 24 that mainly form rubber lugs are placed on the surfaces of the rudder 12, respectively.

Then, after the release plates 25, 25 are placed on this and temporarily fixed, as a second step, as shown in FIG.
5 and 25 face each other. After that, as a third step, the release plates 25, 25 are contacted and pressed,
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 and 11, and the outer molds 12 and 12 are pressed by the cylinders 32 and 32 from the outside thereof, so that the inner and outer molds 11 and 12 are pressed. The various members are pressed and attached to the surface. The central pressure-resistant material 31 and the pressing material 33 provided at the tip of the cylinder 32 both have a built-in heating device, which is an example of a vulcanization molding device as it is.

However, as the fourth step, as shown in FIG. 7, the pressure of the cylinder 32 is then released, the inner and outer molds 11 and 12 are opened, and the release plates 25 and 25 are removed. At this time, the roller rubber 21 and the intermediate rubber 2
The core metal 22 sandwiched between 3 and 3 is embedded in the rubbers 21 and 23 and adheres to the inner mold 11 surface, while the cap rubber 24 adheres to the outer mold 12 surface. This will not fall out.

Now, with the inner and outer molds 11 and 12 and various members kept in this state, as a fifth step, as shown in FIG. 8, a steel code row 26 is placed at the position where the release plate 25 is located. insert. The steel cord row 26 has an annular shape and is tensioned by a rotating arm 34.
Then, this descends from above and the steel code row 26 is placed at the position of the release plate 25. Then, the inner and outer molds 11 and 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 where the steel cord row 26 and the rubber are vulcanized and molded, and FIG. 10 is a top view thereof. That is, in this example, the inner and outer molds 11 and 12 vulcanize and mold the rubber inside and outside the steel code row 26 to form a quarter of the rubber crawler, and then As shown in FIG. 11, the rotating arm 34 is rotated by a quarter length of the steel code row 26,
Rubber is vulcanized and molded inside and outside the steel cord row 26 again to complete the rubber crawler.

[0021]

As described above, according to the present invention, it is possible to manufacture a rubber crawler in which a tensile body row has an annular shape.
Since there is no overlapping part of the tensile body row for the endless shape as in the past, the uniformity of the rubber crawlers is improved, and the properties of the rubber crawlers are improved and the durability is improved. Will be improved. In addition, since rubber can be vulcanized and molded at any position and inside and outside the steel cord row, the mold can be small and the number of mold faces can be small. There is an advantage.

[Brief description of drawings]

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

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

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

FIG. 4 is a first step view of the vulcanization molding apparatus used for practicing the present invention, and is a view in which the inner and outer molds are horizontally widened.

5 is a second step view of the vulcanization molding apparatus shown in FIG. 4, and is a view in which the inner and outer molds are rotated 90 degrees to stand upright.

FIG. 6 is a third step view of the vulcanization molding apparatus shown in FIG. 4, showing the pressurization state of the inner and outer molds.

FIG. 7 is a fourth step view of the vulcanization molding device shown in FIG. 4, and is a view in which the cylinder is released.

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

FIG. 9 is a side view in which a steel cord row and rubber are vulcanized and molded in the present invention.

FIG. 10 is a top view of FIG.

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

[Explanation of symbols]

1 ‥‥ tensile element row, 2 ‥‥ Gomuragu, 3 ‥‥ new filled rubber, 4 ‥‥ metal core, 4 ₁ ‥‥ core metal projections, 5, 6, 7, 8 ‥‥ mode - field, 5 ₁ Depression of mold, 11 inner mold, 12 outer mold, 21 rolling rubber, 22 core metal, 23 intermediate rubber, 24 cap rubber, 25 Release plate, 26 steel cord row, 31 central pressure-resisting material, 32 cylinder, 33 pressing material, 34 rotating arm.

Claims (6)

[Claims] 1. A cored bar arranged at a constant pitch,
A method of manufacturing a rubber crawler in which a tensile body row enclosing the same is embedded in rubber, wherein a mold release plate is arranged at a portion where the tensile body row is embedded, and the tensile body row is further arranged. After arranging the member on the inner peripheral side and the member on the outer peripheral side of the rubber crawler,
After molding in the mold, remove the release plate, set the rubber-trial tension body at the position of the release plate, and then vulcanize the rubber under pressure in the mold. A method for producing a rubber crawler, comprising: 2. The method for producing a rubber crawler according to claim 1, wherein the tension body row is annular. 3. The method for producing a rubber crawler according to claim 1 or 2, wherein rubber vulcanization is partially and sequentially carried out in a ring of tensile body. 4. An inner and outer mold forming an inner peripheral surface and an outer peripheral surface of the rubber crawler is opened in a horizontal direction, and after the tensile body row is inserted in the vertical direction, the mold is closed and a rubber member is added. The method for producing a rubber crawler according to any one of claims 1 to 3, which is obtained by pressure vulcanization. 5. An inner mold forming an inner peripheral surface of the rubber crawler.
Place the mold upwards, select a release plate instead of the tensile body row on this mold, and place all the members that make up the rubber crawler, and then form the outer peripheral surface of the rubber crawler. Put the outer mold to stand and stand the inner and outer molds vertically,
During this time, all the members between the inner and outer molds are pressurized, then the inner and outer molds are opened and the mold release plate is removed. A method for producing a rubber chlore characterized by vulcanizing. 6. A method of manufacturing a rubber crawler according to claim 5, wherein a pair of inner molds are used, and these are opposed to each other and are erected vertically.