JPH11156856A - Tire vulcanizing mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the reaction force of tire internal pressure generated during raw tire vulcanization and to decrease the outside diameter of a container. SOLUTION: A tire vulcanizing mold 10 is equipped with a segment 14 whose outside inclined plane is formed in the shape of a taper to increase its diameter upward and a container 24 having a taper-shaped inside inclined plane. When a tire is inserted and removed, to form a prescribed clearance W between the tread part of the tire 12 and the segment 14, the outside inclined plane of the segment 14 and the inside inclined plane of container 24 are slid by a prescribed distance to move the segment 14 in a prescribed direction. The inclinations of the outside inclined plane the segment 14 and the inside inclined plane of the container 24 are determined to make the slide angle θ 5-10 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire vulcanizing mold suitable for vulcanizing green tires, especially large tires for trucks and buses having a diameter of about 3 m.

[0002]

2. Description of the Related Art Conventionally, a green tire is vulcanized and molded into a predetermined shape by heating from a radially outer peripheral surface and a widthwise side surface of the green tire in a tire vulcanizing mold.

[0003] When a green tire is inserted into a tire vulcanization mold and when the tire is taken out of the tire vulcanization mold after vulcanization is completed (hereinafter, a raw tire before vulcanization and a tire after vulcanization are collectively referred to as a tire). ), It is necessary to form a predetermined gap so that the radially outer peripheral surface of the tire does not contact the inner peripheral surface of the segment. In this case, a predetermined amount of gap is formed by sliding the outer inclined surface of the segment and the inner inclined surface of the container by a predetermined distance. At this time, the outer inclined surface of the segment and the inner inclined surface of the container are so arranged that the angle (sliding angle) when the outer inclined surface of the segment slides on the inner inclined surface of the container is generally 15 to 20 °. Is determined.

Further, a mold for vulcanizing and molding the side surface in the width direction of the tire into a predetermined shape may be opened by an internal pressure reaction force of the tire internal pressure generated at the time of vulcanizing the tire. For this reason, the mold is fastened by a fastening member (for example, a lock ring) or the like to prevent the mold from opening during vulcanization.

[0005]

However, the sliding angle between the outer inclined surface of the tire vulcanizing mold segment and the inner inclined surface of the container depends on the type (size, etc.) of the tire to be vulcanized. The angle is set to 15 to 20 degrees accordingly.
The internal pressure reaction force due to the tire internal pressure generated during vulcanization, that is, the force acting in the direction in which the mold opens, increases according to the magnitude of the sliding angle. For this reason, there is a problem that it is necessary to increase the clamping force of the mold by the clamping member or the like according to the magnitude of the sliding angle.

There is also a problem that the outer diameter of the container increases and the weight increases in accordance with the magnitude of the sliding angle.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is possible to reduce the internal pressure reaction force of the tire internal pressure generated at the time of vulcanizing a raw tire and to reduce the outer diameter of the container. An object is to provide a tire vulcanizing mold.

[0008]

Means for Solving the Problems To achieve the above object, an invention according to claim 1 is a tire vulcanizing mold for vulcanizing and molding a green tire. A segment for vulcanizing and molding the radially outer peripheral surface of the raw tire into a predetermined shape, and an inner inclined surface corresponding to an outer inclined surface of the segment are formed, and the outer inclined surface and the inner inclined surface are formed. A ring-shaped container in which the surface is slidable through the same axis and the inclination angle of the inner inclined surface is determined so that the sliding angle is 5 to 10 °,
have.

According to the first aspect of the present invention, the tire vulcanizing mold is provided with a segment for vulcanizing and molding the radially outer peripheral surface of the green tire, that is, the tread portion of the tire into a predetermined shape. The segment is divided into a plurality of pieces along the circumferential direction of the green tire, and when the green tire is vulcanized, the inner surface of the segment comes into contact with the tread portion of the green tire, and is vulcanized and molded into a predetermined shape to be molded. The outer inclined surface of this segment is formed by an inclined surface whose diameter increases as going upward.

Further, the tire vulcanizing mold is provided with a ring-shaped container having an inner inclined surface corresponding to the outer inclined surface of the segment. The inner inclined surface of the container, like the outer inclined surface of the segment, is formed by an inclined surface whose diameter increases as going upward. That is, the inner inclined surface of the container is formed in a tapered shape. The container is provided so that the inner inclined surface of the container and the outer inclined surface of the segment can slide through the same axis as the segment. The sliding angle at this time is 5 to 1 depending on the type of raw tire to be vulcanized.
It is set to 0 °. Therefore, the inclination angle between the inner inclined surface of the container and the outer inclined surface of the segment is 5 degrees.
It is determined to be 〜１０10 °.

In this way, the sliding angle between the inner inclined surface of the container and the outer inclined surface of the segment is set at 5 to 10 °. Thereby, the internal pressure reaction force of the tire internal pressure generated during vulcanization of the raw tire can be reduced. Further, the tightening force of a tightening member such as a lock ring for tightening a mold for vulcanizing and molding the widthwise side surface of the green tire into a predetermined shape can be reduced. Further, the outer diameter of the container can be reduced and the weight can be reduced. The sliding angle between the inner inclined surface of the container and the outer inclined surface of the segment is 7-9.
It is preferable to set to °.

According to a second aspect of the present invention, an auxiliary ring having an inner inclined surface which is an extension of the inner inclined surface of the container when the container is attached can be detachably attached to the container. And

As described above, the sliding angle between the outer inclined surface of the segment provided on the tire vulcanizing mold and the inner inclined surface of the container is set at 5 to 10 °. In this case, a predetermined amount of gap is formed between the radially outer surface of the tire and the inner surface of the segment when the green tire is inserted into the tire vulcanizing mold and when the tire is removed from the tire vulcanizing mold after vulcanization. For this purpose, it is necessary to increase the sliding distance between the outer slope of the segment and the inner slope of the container.

Therefore, according to the invention described in claim 2,
At the time of inserting the raw tire into the tire vulcanizing mold and removing the tire from the tire vulcanizing mold after vulcanization, an auxiliary ring is attached to the end of the container in the radial direction. The auxiliary ring is formed by an inner inclined surface which is an extension of the inner inclined surface of the container when attached to the container. That is, the inclination angle of the inner inclined surface of the auxiliary ring is
It is the same as the inclination angle of the inner inclined surface of the container. This makes it possible to slide the inner inclined surface of the container, the inner inclined surface of the auxiliary ring, and the outer inclined surface of the segment, so that the sliding distance can be increased. Therefore, a predetermined amount of gap can be formed between the radially outer peripheral surface of the tire and the inner surface of the segment when the raw tire is inserted into the tire vulcanization mold and when the tire is removed from the tire vulcanization mold after vulcanization. . The auxiliary ring is configured to be detachable, and may be used by attaching and closing the mold, and may be detached during vulcanization molding.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1A and 1B show a part of a tire vulcanizing mold 10 for vulcanizing a green tire (hereinafter referred to as a tire) 12. FIG. 1A shows the tire vulcanizing mold 10 when the tire 12 is inserted and taken out, and FIG. 1B shows the tire vulcanizing mold 10 when the tire 12 is vulcanized. It is shown. In the tire vulcanizing mold 10 according to the present embodiment, a tire 12 having a diameter of about 3 m is to be vulcanized.

As shown in FIGS. 1A and 1B,
The tire vulcanizing mold 10 is provided with a segment 14 for vulcanizing a tread portion of the tire 12. The segment 14 is divided into a plurality (eleven in the present embodiment) along the circumferential direction of the tire 12 (see FIG. 2). A different tread pattern according to the type of the tire 12 is engraved on the inner peripheral surface of the segment 14 and the contact surface 14C with the tire 12 at the time of vulcanization.

On the other hand, the outer peripheral surface of the segment 14 is formed in a tapered shape whose diameter increases as going upward.
Hereinafter, the outer peripheral surface of the segment 14 formed in a tapered shape is referred to as an outer inclined surface. The angle of inclination of the outer inclined surface of the segment 14 is determined in accordance with the angle of inclination of the inner peripheral surface of the container 24 described later.

The upper mold 16 vulcanizes and molds a sidewall portion into a predetermined shape from a shoulder portion on one side surface in the width direction of the tire 12. On the other hand, the lower mold 18 vulcanizes and molds the sidewall portion into a predetermined shape from the shoulder portion on the other side surface in the width direction of the tire 12. An upper base ring 20 for vulcanizing and molding one bead portion of the tire 12 is attached to a position corresponding to a bead portion of the tire 12 in the upper mold 16, and is attached to a bead portion of the tire 12 in the lower mold 18. At a corresponding position, a lower base ring 22 for vulcanizing and molding the other bead portion of the tire 12 is attached.

Outside the outer inclined surface of the segment 14,
A ring-shaped container 24 is provided. The inner peripheral surface of the container 24 is tapered so as to increase in diameter as it goes upward. Hereinafter, the inner peripheral surface of the container 24 is referred to as an inner inclined surface. The above-described segment 14 is provided between the inner inclined surface of the container 24 and the segment 1.
4 is disposed so as to be slidable along the same axis (tire transport shaft 28 shown in FIG. 3).

Further, a sliding angle θ when the inner inclined surface of the container 24 slides on the outer inclined surface of the segment 14.
Is set at 5 to 10 ° depending on the type of the tire 12 to be vulcanized. That is, the inclination angles of the inner inclined surface of the container 24 and the outer inclined surface of the segment 14 are determined so that the sliding angle θ is 5 to 10 °. For example, when the diameter (outer diameter) of the tire 12 to be vulcanized is approximately 3 m85 cm and the width is approximately 1 m35 cm, the sliding angle θ is set to 9 °, and the sliding angle θ (= 9 °)
The inclination angles of the inner inclined surface of the container 24 and the outer inclined surface of the segment 14 are determined in accordance with.

Further, the tire 1 to the tire vulcanizing mold 10
At the time of insertion and removal of 2, it is necessary to form a predetermined gap W between the tread portion of the tire 12 and the inner surface of the segment 14 in order to prevent the tire 12 from contacting the segment 14. When the sliding angle θ is set to 5 to 10 °, the slidable distance between the outer inclined surface of the segment 14 and the inner inclined surface of the container 24 is short,
It is difficult to form a predetermined amount of gap W. For this reason, the outer ring 26 is attached to the upper part of the container 24 to extend the slidable distance.

The outer ring 26, like the container 24, has an inner peripheral surface formed in a tapered shape so as to increase in diameter as it goes upward. The inclination angle of the inner inclined surface as the inner peripheral surface of the outer ring 26 is formed to be the same as the inclination angle of the inner inclined surface of the container 24. That is, when the outer ring 26 is attached to the container 24, the inner inclined surface of the outer ring 26 forms an extension of the inner inclined surface of the container 24. Accordingly, the slidable distance between the segment 14 and the outer inclined surface can be increased.

The lower portion of the outer ring 26 is formed into a shape that fits with the upper portion of the container 24 when the outer ring 26 is attached to the container 24, and is detachable as required. That is, the outer ring 26 can be attached only when the tire 12 is inserted into or removed from the tire vulcanizing mold 10.

FIG. 3 shows a schematic configuration of the opening / closing mechanism 44 of the tire vulcanizing mold 10, which is a part of a vulcanizing mechanism for vulcanizing and molding the tire 12.

The opening / closing mechanism 44 is provided with a rail 40, along which the tire transport shaft 28 moves. The movement of the tire transport shaft 28 is instructed by an operator 34 operating an operation panel (not shown), so that the tire 12 can be transported to a predetermined position. Although two tire transport shafts 28 are shown in FIG. 3, one tire transport shaft 2 is actually used.
8 is configured to move along the rail 40. That is, in FIG. 3, the tire transport shaft 28 is
This is shown.

The outer ring 2 is mounted on the tire transport shaft 28.
6, an outer ring arm 32 for holding the upper mold 6, an upper mold arm 38 for lifting the upper mold 16, and a tire arm 36 for hanging and lifting the tire 12 are connected.

The opening / closing mechanism 44 of the tire vulcanizing mold 10 is also provided.
Has two mounting tables 42A and 42B on which the tires 12 are mounted.
Is provided. A roller 48 is attached to each of the mounting tables 42A and 42B, and plays a role of a truck for transporting the tire 12. On the mounting table 42A,
Tire before vulcanization by tire vulcanizing mold 10 (raw tire)
12 is placed. The tire 12 mounted on the mounting table 42A is hung by the tire arm 36,
By operating the tire transport shaft 28 together with the tire vulcanizing mold 10 and the container 24, the tire is transported to a vulcanizer (not shown), and the container 24 is housed together. On the other hand, the tire (product tire) 12 after vulcanization by the tire vulcanizing mold 10 is mounted on the mounting table 42B. Further, the mounting table 42
In the vicinity of B, an outer ring mounting table 46 on which the outer ring 26 attachable to the tire vulcanizing mold 10 is mounted.
Are arranged.

A cylinder 30 for pushing up the lower mold 18 of the tire vulcanizing mold 10 is provided below the mounting position of the tire vulcanizing mold 10.

Next, the operation of the embodiment of the present invention will be described. In this embodiment, a case where the tire 12 after vulcanization is removed from the tire vulcanizing mold 10 will be described with reference to FIG.

After the vulcanization of the tire 12 by the tire vulcanizing mold 10, the operator 34 operates the outer ring arm 32 by operating the operation panel, and the outer ring 26 provided on the mounting table (not shown) is placed in the container. Attach to the top of 24. This allows the container 24
An extension surface of the inner inclined surface is formed.

When the outer ring 26 is attached to the container 24, the cylinder 30 is driven to push up the lower mold 18. At this time, the outer inclined surface of the segment 14 slides by a predetermined distance along the inner inclined surface of the container 24 and the inner inclined surface of the outer ring 26, and a predetermined distance between the tread portion of the tire 12 and the inner surface of the segment 14. Is formed. When the outer inclined surface of the segment 14 slides on the inner inclined surface of the outer ring 26, the segment 14 fits into a groove (not shown) of the outer ring 26.

The sliding angle θ when the outer inclined surface of the segment 14 slides on the inner inclined surface of the container 24 and the inner inclined surface of the outer ring 26 is 5 to 5 depending on the type of tire as described above. It is set to 10 ° (9 ° in the present embodiment).

Thus, the outer diameter of the container 24 can be reduced, and the weight of the container 24 can be reduced. Further, the internal pressure reaction force of the tire internal pressure generated during vulcanization of the tire 12 can be reduced. Further, by attaching the outer ring 26, the inner inclined surface of the container 24 on which the outer inclined surface of the segment 14 slides is extended, so that the slidable distance becomes longer and the tread portion of the tire 12 and the inner surface of the segment 14 A predetermined amount of gap W can be formed therebetween.

When the tire 12 is pushed up to a predetermined position by driving the cylinder 30, the outer ring 26, the tire 12, and the upper mold 16 are respectively formed by the outer ring arm 32, the tire arm 36, and the upper molding arm 38. Sandwich. After that, the outer ring 26 and the tire 1
2, and the upper mold 16 is transported above the mounting table 42B, and the tire arm 36 is operated to mount the tire 12 on the mounting table 42B. The vulcanized tire 12 is mounted on the mounting table 4
While being mounted on the 2B, the process proceeds to downstream processes such as cooling and inspection. Further, the outer ring 26 (and the segment 14) is mounted on the outer ring mounting table 46 by operating the outer ring arm 32.

By doing so, the tire vulcanizing mold 1
The operation of removing the tire 12 from 0 is completed. In addition,
The tire transport shaft 28 goes to the mounting table 42A to collect raw tires, returns to the container 24, and performs the next vulcanization.

As described above, the outer inclined surface of the segment 14 and the container 24 are adjusted so that the sliding angle θ between the outer inclined surface of the segment 14 and the inner inclined surface of the container 24 is 5 to 10 °. Since the inclination angle of the inner inclined surface is determined, the outer diameter of the container 24 can be reduced in size and the weight can be reduced. Further, the internal pressure reaction force due to the tire internal pressure generated during vulcanization of the tire 12 can be reduced.

Further, by setting the sliding angle θ to 5 to 10 °, the tread portion of the tire 12 and the segment 1
In order to form a predetermined amount of gap W between the inner surface of the container 4 and the inner inclined surface of the container 24, it is necessary to increase the sliding distance. Thereby, the sliding distance can be increased as necessary.

In this embodiment, the case where the outer ring 26 is attached by fitting it to the upper part of the container 24 has been described as an example, but the present invention is not limited to this. For example, it may be configured to be attached to the container 24 using a screw member such as a screw. That is, any structure may be used as long as the outer ring 26 can be detachably attached to the container 24.

[0039]

As described above, according to the present invention, the outer slope of the segment is adjusted so that the sliding angle between the outer slope of the segment and the inner slope of the container is 5 to 10 degrees. Further, since the inclination angle of the inner inclined surface of the container is determined, the internal pressure reaction force due to the tire internal pressure generated during the vulcanization of the raw tire can be reduced, and the outer diameter of the container can be reduced in size and the weight can be reduced. , Which is an excellent effect.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a tire vulcanizing mold according to an embodiment of the present invention. (A) shows the tire vulcanizing mold when the tire is inserted into the tire vulcanizing mold or when the tire is removed from the tire vulcanizing mold after vulcanization.

FIG. 2 is a schematic view showing a container and a segment of a tire vulcanizing mold.

FIG. 3 is a schematic view showing an opening and closing mechanism of a tire vulcanizing mold.

[Explanation of symbols]

 10 tire vulcanizing mold 12 tire 14 segment 24 container 26 outer ring (auxiliary ring)

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI B29L 30:00

Claims (2)

[Claims] 1. A tire vulcanization mold for vulcanizing and molding a green tire, wherein the tire is divided into a plurality of pieces along a circumferential direction of the green tire, and a radially outer peripheral surface of the green tire is vulcanized to a predetermined shape. And an inner inclined surface corresponding to the outer inclined surface of the segment, wherein the outer inclined surface and the inner inclined surface are slidable along the same axis, and the sliding angle is 5 to 10 And a ring-shaped container in which the inclination angle of the inner inclined surface is set to be 0 °. 2. The container according to claim 1, wherein an auxiliary ring having an inner inclined surface which is an extension of the inner inclined surface of the container at the time of attachment is detachably attachable to the container. Tire vulcanizing mold.