JPH06226769A - Mold for crawler - Google Patents

Abstract

PURPOSE:To easily form a groove, to commonly use a base mold even if a lug pattern is different, and to allow the air to be easily released from a lug hole by forming an air escape groove in the mating surfaces of cavity molds near the hole. CONSTITUTION:Cavity molds 3, 13 of upper and lower molds 11, 12 are suitably replaced to match a core and a lug pattern of a crawler to be manufactured. A groove is not formed in a mating surface 4a of a base mold 4, but an air escape groove 5 is so formed on a mating surface 3a of the mold 3 as to surround Jug holes 2 via a small gap. The groove 5 is formed in a V-shaped sectional shape. Since the groove is formed in the mold 3, a smaller-sized processing machine as compared with the case in which the groove is formed on the mold 4. Thus, even if the mold 3 is altered, the mold 4 can be commonly used, and air escaping from the hole 2 can be reliably and effectively conducted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a crawler mold for vulcanizing and molding an elastic crawler.

[0002]

2. Description of the Related Art Generally, a mold for a crawler is divided into an upper mold and a lower mold, and each of the upper and lower molds has a plurality of cavity molds and a base mold for mounting the cavity molds. A lug hole and an outer peripheral surface cavity for forming are formed, and a core metal hole and an inner peripheral surface cavity for forming the inner periphery of the crawler are formed in the lower cavity mold.

In this upper mold, in order to prevent the generation of air and bare (an unvulcanized portion caused by the presence of air), a groove (saw cut) for air escape is provided at the mating portion of the cavity mold and the base mold. Conventionally, the air escape groove is formed only in the longitudinal direction of the crawler so as to cross the lug hole on the mating surface of the base mold.

[0004]

In the above-mentioned prior art, since the air escape groove is formed on the mating surface of the large base mold so as to correspond to the lug hole, it is extremely difficult to process and if the lug pattern is different. The base mold also has to be changed, and since it is formed only in the crawler longitudinal direction, most of it is far away from the lug hole except for the portion that crosses the lug hole, and it is difficult for air to escape.

A first object of the present invention is to facilitate the groove processing by forming the air escape groove on the mating surface of the cavity mold and in the vicinity of the lug hole. It is to provide a mold for a crawler that can be commonly used and that allows air to easily escape from a lug hole. A second object of the present invention is to provide a mold for a crawler capable of increasing the air escape capacity by forming an air escape groove from an encircling groove surrounding a lug hole to form an extension groove.

[0006]

A first concrete means for solving the problems in the present invention is a cavity mold 3 having a lug hole 2 for forming a lug side surface of the crawler, and a cavity mold 3 which is the longitudinal direction of the crawler. A plurality of base molds 4 arranged in the same direction and attached, and a cavity mold 3 and a base mold 4
In the mold for a crawler in which the groove 5 for air escape is formed in the mating portion with, the air escape groove 5 is formed on the mating surface 3a of the cavity mold 3 and in the vicinity of the lug hole 2.

In addition to the first concrete means, the second concrete means for solving the problems in the present invention is such that the air escape groove 5 is formed in the crawler longitudinal direction and / or the width direction with respect to the lug hole 2. From the surrounding enclosing groove 5A to the extension groove 5B, the lug hole 2
It is formed in the direction away from.

[0008]

When rubber for forming a crawler, a tension member, a core metal, etc. are arranged between the upper and lower molds 11, 12 and a pressing pressure is applied, the rubber flows into the upper and lower cavity molds 3, 13, The lug hole 2 of the cavity mold 3 and the like are filled. The air in the cavity mold 3 collects at the upper part of the lug hole 2 and tries to escape from the gap of the mating portion with the base mold 4. An air escape groove 5 is formed on the mating surface 3a of the cavity mold 3, and the surrounding groove 5A of the air escape groove 5 is located in the vicinity of the lug hole 2 so as to surround the lug hole 2.
Air easily escapes from.

If a large amount of air escapes, the surrounding groove 5A
Not only does it enter the extension groove 5B, but also reaches the communication groove 6 if there is more.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In the first embodiment shown in FIGS. 1 to 3, the crawler mold 1 has upper and lower molds 11 and 12, and the upper mold 11 forms a cavity mold 3 forming an outer peripheral surface (lug side surface) of the crawler, and this cavity mold 3. And a base mold 4 in which a large number of are mounted in the crawler longitudinal direction. The lower mold 12 has a cavity mold 13 that forms the inner peripheral side surface of the crawler, and a base mold 14 in which a plurality of the cavity molds 13 are arranged in the longitudinal direction of the crawler and attached.

In the cavity mold 13 of the lower mold 12,
A cored bar hole 15 and an inner peripheral surface cavity 16 that form the inner periphery of the crawler are formed. The cavity mold 3 of the upper mold 11 is formed with a lug hole 2 and an outer peripheral surface cavity 17 that form the lug side surface of the crawler, and the lug hole 2 is formed in one cavity mold 3 of two types, long and short, respectively. Penetrates the cavity mold 3 vertically.

The cavity molds 3 and 13 of the upper and lower molds 11 and 12 are appropriately replaced according to the core bar and lug pattern of the crawler to be manufactured. No groove is formed on the mating surface 4a of the base die 4, but an air escape groove 5 is formed on the mating surface 3a of the cavity die 3 which is in contact with the base die 4 so as to surround each lug hole 2 with a small gap. Has been formed.

That is, the air escape groove 5 is located along the sides of the lug hole 2 in the crawler longitudinal direction and the width direction so as to surround the entire circumference thereof. However, the air escape groove 5 may be formed in two parallel lines corresponding to two sides of the lug hole 2 in the crawler longitudinal direction, or in a U shape corresponding to two sides of the lug hole 2 in the crawler longitudinal direction and one side of the crawler width direction. It is good that it is close to the lug hole 2, and it is good if it is surrounded, and the surrounding can be formed in double or triple.

The air escape groove 5 has a V-shaped cross section, and since this groove is formed in the cavity mold 3, it can be formed by a smaller processing machine than the base mold 4, and its cross sectional shape is half. It may be circular or rectangular. Further, the air escape groove 5 may be a continuous groove, but an interrupted groove is preferable because rubber clogging is less likely to occur. In the second embodiment shown in FIGS. 4 and 5, the air escape groove 5 is formed from the surrounding groove 5A along the crawler longitudinal direction and the width direction with respect to the lug hole 2.
The extension groove 5B is formed in a direction away from the lug hole 2.

The surrounding groove 5A and the extension groove 5B are both formed on the mating surface 3a, the extension groove 5B extending along the crawler width direction is extended to the side end of the cavity mold 3, and the extension groove 5B extending along the crawler longitudinal direction is adjacent. It is formed up to the front of the surrounding groove 5A. The extension groove 5B can be formed so as to cross the lug hole 2. An extension groove 5B extending from the surrounding groove 5A for the long lug hole 2 along the crawler longitudinal direction
Shows an intermittent groove, which is in communication with or adjacent to the adjacent extended groove 5B for long lug hole 2 via the communication groove 6. This communication groove 6 is also formed as a continuous groove or an interrupted groove, and may be considered as a linearly arranged groove including a part of the surrounding groove 5A along the crawler longitudinal direction and the extension groove 5B, but it is separated from them. They may be formed in parallel, or may be formed in a direction intersecting with the extension groove 5B for the long and short lug holes 2 or the surrounding groove 5A along the crawler width direction.

In the third embodiment shown in FIG. 6, the communication groove 6
Is located on a line including a part of the surrounding groove 5A along the crawler longitudinal direction and the extension groove 5B in a plan view or parallel to each other, but is formed on the mating surface 4a of the base mold 4 and On the other hand, even if the cavity mold 3 is replaced with another one, it always exists. Communication groove 6 of the third embodiment
Can be applied instead of or at the same time as the communicating groove 6 of the second embodiment, and a large processing machine is required for processing, but the base mold 4 can be commonly used even if the cavity mold 3 is changed. .

The base mold 4 includes a cavity mold 3
The air escape groove may be formed at a position corresponding to the lug hole 2. In the case of forming the air escape groove, it is preferable that the air escape groove is kept in the non-communication state rather than being communicated with the surrounding groove 5A because the rubber is not clogged.

[0018]

According to the present invention described in detail above, a cavity mold 3 having a lug hole 2 for forming a surface of a crawler on the side having a lug, and a plurality of the cavity molds 3 are arranged in the crawler longitudinal direction. In a mold for a crawler, which has an attached base mold 4, and in which a groove 5 for air escape is formed in a mating portion of the cavity mold 3 and the base mold 4,
The air escape groove 5 is formed on the mating surface 3a of the cavity mold 3.
Since it is formed near the lug hole 2, the cavity mold 3 is a smaller product than the base mold 4, so that it is easy to machine the air escape groove 5, and even if the cavity mold 3 is changed, The mold 4 can be commonly used, and air can be released from the lug hole 2 reliably and effectively.

Further, since the air escape groove 5 is formed from the surrounding groove 5A along the crawler longitudinal direction and / or the width direction of the lug hole 2 to the extension groove 5B in the direction away from the lug hole 2, the air escape groove 5 is formed. The capacity can be increased.

[Brief description of drawings]

FIG. 1 is a sectional front view showing a first embodiment of the present invention.

FIG. 2 is a bottom view of the same cavity mold.

FIG. 3 is a side view of the same section.

FIG. 4 is a sectional front view showing a second embodiment.

FIG. 5 is a bottom view of the cavity mold.

FIG. 6 is a sectional front view showing a third embodiment.

[Explanation of symbols]

 2 lug hole 3 cavity type 3a mating surface 4 base type 4a mating surface 5 air escape groove 5A surrounding groove 5B extension groove 6 communication groove

Claims (2)

[Claims] 1. A cavity mold (3) having a lug hole (2) for forming a surface of a crawler having a lug, and a base mold having a plurality of the cavity molds (3) arranged in the crawler longitudinal direction. (4), wherein a groove (5) for air escape is formed at a mating portion of the cavity die (3) and the base die (4), the air escape groove (5) is provided. A mold for a crawler, which is formed on the mating surface (3a) of the cavity mold (3) and in the vicinity of the lug hole (2). 2. The air escape groove (5) extends from the surrounding groove (5A) extending along the crawler longitudinal direction and / or the width direction to the lug hole (2) to the extension groove (5B) extending from the lug hole (2). The crawler mold according to claim 1, wherein the mold is formed in a direction away from each other.