JP2006218879A - Mold for vulcanizing tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the inner pressure reaction force of the tire inner pressure generated in vulcanizing a green tire and to downsize a container in its exterior diameter. <P>SOLUTION: A mold for vulcanizing a tire 10 is furnished with a segment 14 whose exterior slope is formed tapered so that a more upper part thereof has a larger diameter, and a container 24 whose interior slope is formed tapered. When a tire 12 is inserted or taken out, the segment 14 is moved in a specified direction by sliding the exterior slop of the segment 14 along the interior slope of the container 24 by a specified distance, in order to form a specified clearance W between a tread section of the tire 12 and an interior surface of the segment 14. Angles of the exterior slope of the segment 14 and the interior slope of the container 24 are set so that the sliding angle θ takes a value of 5-10°. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a tire vulcanization mold suitable for vulcanizing a raw tire, particularly a large tire for TB (truck, bus) having a diameter of about 3 m.

  Conventionally, a raw tire is vulcanized and molded into a predetermined shape by heating from a radial outer peripheral surface and both lateral sides of the raw tire with a tire vulcanization mold.

  When inserting a raw tire into a tire vulcanization mold and when removing a tire from a tire vulcanization mold after vulcanization (hereinafter, the raw tire before vulcanization and the tire after vulcanization are collectively referred to as a tire). Therefore, it is necessary to form a predetermined amount of gap so that the radially outer peripheral surface of the tire and the inner peripheral surface of the segment do not contact each other. 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 so that the angle (sliding angle) when the outer inclined surface of the segment and the inner inclined surface of the container slide is generally 15 to 20 °. The inclination angle is determined.

  Also, a mold for vulcanizing and molding the side surface in the width direction of the tire may open due to an internal pressure reaction force of the tire internal pressure generated when the tire is vulcanized. For this reason, the mold is tightened by a tightening member (for example, a lock ring) to prevent the mold from being opened during vulcanization.

  However, the sliding angle between the outer inclined surface of the segment of the tire vulcanization mold and the inner inclined surface of the container is set to 15 to 20 ° depending on the type (size, etc.) of the tire to be vulcanized. ing. The internal pressure reaction force due to the tire internal pressure generated during vulcanization, that is, the force acting in the mold opening direction increases in accordance with the size of the sliding angle. For this reason, there exists a problem that it is necessary to increase the clamping force of the mold by a clamping member etc. according to the magnitude | size of a sliding angle.

  In addition, there is a problem that the outer diameter of the container increases and the weight increases according to the size of the sliding angle.

  The present invention has been made to solve the above-described problems, and is capable of reducing the internal pressure reaction force of the tire internal pressure generated during raw tire vulcanization and reducing the outer diameter of the container. The purpose is to provide molds.

  In order to achieve the above object, the invention according to claim 1 is a tire vulcanization mold for vulcanizing and molding a raw tire, and is divided into a plurality of parts along the circumferential direction of the raw tire. A segment for vulcanizing and molding a radially outer peripheral surface into a predetermined shape and an inner inclined surface corresponding to the outer inclined surface of the segment are formed, and the outer inclined surface and the inner inclined surface slide through the same axis. A ring-shaped container in which an inclination angle of the inner inclined surface is determined so that a sliding angle with respect to the inner surface of the segment is 5 to 10 °, and a tread end of the raw tire It has an upper mold and a lower mold for vulcanizing and molding the sidewall portion into a predetermined shape from the side portion.

  According to the first aspect of the present invention, the tire vulcanization mold is provided with a segment for vulcanizing and molding the outer peripheral surface of the raw tire in the radial direction, that is, the tread portion of the tire into a predetermined shape. The segment is divided into a plurality 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. The outer inclined surface of this segment is formed by an inclined surface whose diameter increases as it goes upward.

  The tire vulcanization mold is provided with a ring-shaped container having an inner inclined surface corresponding to the outer inclined surface of the segment. Similar to the outer inclined surface of the segment, the inner inclined surface of the container is formed by an inclined surface whose diameter is increased upward. That is, the inner inclined surface of the container is formed in a taper 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 set to 5 to 10 ° depending on the type of raw tire to be vulcanized. Therefore, the inclination angles of the inner inclined surface of the container and the outer inclined surface of the segment are determined so that the sliding angle between the inner inclined surface of the container and the outer inclined surface of the segment is 5 to 10 °.

  Thus, the sliding angle between the inner inclined surface of the container and the outer inclined surface of the segment is set to 5 to 10 °. Thereby, the internal pressure reaction force of the tire internal pressure generated at the time of vulcanization of the green tire can be reduced. Further, it is possible to reduce the tightening force of a tightening member such as a lock ring for tightening a mold for vulcanizing and molding the side surface in the width direction of the green tire. 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 preferably set to 7 to 9 °.

  The invention according to claim 2 is characterized in that an auxiliary ring formed with an inner inclined surface that is an extension of the inner inclined surface of the container can be detachably attached to the container.

  As described above, the sliding angle between the outer inclined surface of the segment provided in the tire vulcanization mold and the inner inclined surface of the container is set to 5 to 10 °. In this case, a predetermined amount of gap is formed between the outer surface in the radial direction 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 is completed. In order to achieve this, it is necessary to increase the sliding distance between the outer inclined surface of the segment and the inner inclined surface of the container.

  Therefore, according to the invention described in claim 2, when inserting the raw tire into the tire vulcanization mold and when removing the tire from the tire vulcanization mold after the vulcanization is completed, the container is assisted in the end portion in the diameter increasing direction of the container. Install the ring. The auxiliary ring is formed by an inner inclined surface that 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 the same as the inclination angle of the inner inclined surface of the container. As a result, the inner inclined surface of the container, the inner inclined surface of the auxiliary ring, and the outer inclined surface of the segment can slide, so that the sliding distance can be increased. Accordingly, 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 is completed. . The auxiliary ring is configured to be detachable, and may be attached and used when the mold is opened and closed, and may be removed when vulcanized.

  As described above, according to the present invention, the outer inclined surface of the segment and the inner inclined surface of the container are set so that the sliding angle when the outer inclined surface of the segment and the inner inclined surface of the container slide is 5 to 10 °. Since the inclination angle of the surface is determined, it is possible to reduce the internal pressure reaction force due to the tire internal pressure that occurs during vulcanization of the raw tire, and the excellent effect that the outer diameter of the container can be reduced and the weight can be reduced Have

  1A and 1B show a part of a tire vulcanization mold 10 for vulcanizing a raw tire (hereinafter referred to as a tire) 12. FIG. 1A shows a tire vulcanization mold 10 when the tire 12 is inserted and taken out, and FIG. 1B shows a tire vulcanization mold 10 when the tire 12 is vulcanized. It is shown. In the tire vulcanization mold 10 according to the present embodiment, a tire 12 having a diameter of about 3 m is targeted for vulcanization.

  As shown in FIGS. 1A and 1B, the tire vulcanization mold 10 is provided with a segment 14 for vulcanizing the tread portion of the tire 12. The segment 14 is divided into a plurality (11 in the present embodiment) along the circumferential direction of the tire 12 (see FIG. 2). Different tread patterns are engraved on the inner peripheral surface of the segment 14 and in contact with the tire 12 during vulcanization, depending on the type of the tire 12.

  On the other hand, the outer peripheral surface of the segment 14 is formed in a tapered shape whose diameter is increased toward the upper side. Hereinafter, the outer peripheral surface of the segment 14 formed in a tapered shape is referred to as an outer inclined surface. The inclination angle of the outer inclined surface of the segment 14 is determined according to the inclination angle 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 the bead portion of the tire 12 in the upper mold 16, and the bead portion of the tire 12 in the lower mold 18 is attached. A lower base ring 22 for vulcanizing and molding the other bead portion of the tire 12 is attached to the corresponding position.

  A ring-shaped container 24 is disposed outside the outer inclined surface of the segment 14. The container 24 has an inner peripheral surface 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 segment 14 described above is arranged so that the inner inclined surface of the container 24 and the outer inclined surface of the segment 14 can slide through the same axis (the tire conveying shaft 28 shown in FIG. 3). .

  The sliding angle θ when the inner inclined surface of the container 24 and the outer inclined surface of the segment 14 slide is set to 5 to 10 ° according to 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 dimension) of the tire 12 to be vulcanized is about 3 m85 cm and the width dimension is about 1 m35 cm, the sliding angle θ is set to 9 °, and the sliding angle θ (= 9 °) is set. In addition, the inclination angles of the inner inclined surface of the container 24 and the outer inclined surface of the segment 14 are determined.

  Further, when the tire 12 is inserted into and removed from the tire vulcanizing mold 10, a predetermined amount is provided 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. It is necessary to form the gap W. 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, and a predetermined amount of gap W may be formed. Have difficulty. For this reason, the outer ring 26 is attached to the upper part of the container 24 to extend the slidable distance.

  As with the container 24, the outer ring 26 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 extended surface of the inner inclined surface of the container 24. Thereby, the slidable distance with the outer inclined surface of the segment 14 can be lengthened.

  In addition, the lower part of the outer ring 26 is formed in a shape that fits into the upper part of the container 24 when attached to the container 24, and is configured to be detachable as necessary. That is, the outer ring 26 can be attached only when the tire 12 is inserted into and removed from the tire vulcanizing mold 10.

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

  The opening / closing mechanism 44 is provided with a rail 40, and the tire transport shaft 28 moves along the rail 40. The tire conveyance shaft 28 is instructed to move when the operator 34 operates an operation panel (not shown) so that the tire 12 can be conveyed to a predetermined position. In FIG. 3, two tire transport shafts 28 are shown, but in actuality, one tire transport shaft 28 is configured to move along the rail 40. That is, in FIG. 3, two tire conveyance shafts 28 are shown for convenience of explanation.

  An outer ring arm 32 for sandwiching the outer ring 26, an upper mold arm 38 for lifting the upper mold 16, and a tire arm 36 for hooking and lifting the tire 12 are connected to the tire conveyance shaft 28.

  The opening / closing mechanism 44 of the tire vulcanizing mold 10 is provided with two mounting tables 42A and 42B on which the tire 12 is mounted. A roller 48 is attached to each of the mounting tables 42 </ b> A and 42 </ b> B, and serves as a carriage that transports the tire 12. A tire (raw tire) 12 before vulcanization by the tire vulcanization mold 10 is placed on the mounting table 42A. The tire 12 mounted on the mounting table 42A is hooked by a tire arm 36 and is transported to a vulcanizer (not shown) by operating the tire transport shaft 28 together with the tire vulcanizing mold 10 and the container 24. The container 24 is accommodated together. On the other hand, a tire (product tire) 12 after vulcanization by the tire vulcanization mold 10 is placed on the mounting table 42B. Further, an outer ring mounting table 46 for mounting the outer ring 26 that can be attached to the tire vulcanizing mold 10 is disposed in the vicinity of the mounting table 42B.

  Further, a cylinder 30 for pushing up the lower mold 18 of the tire vulcanizing mold 10 is disposed at a lower portion of the mounting position of the tire vulcanizing mold 10.

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

  After the vulcanization of the tire 12 by the tire vulcanization 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 attached to the upper portion of the container 24. Attach to. Thereby, an extended surface of the inner inclined surface of the container 24 is formed.

  When the outer ring 26 is attached to the container 24 in this way, the cylinder 30 is driven and the lower mold 18 is pushed up. At this time, the outer inclined surface of the segment 14 slides 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 amount is provided between the tread portion of the tire 12 and the inner surface of the segment 14. A gap W is formed. The segment 14 is fitted into a groove (not shown) of the outer ring 26 by sliding the outer inclined surface of the segment 14 and the inner inclined surface of the outer ring 26.

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

  As a result, the outer diameter of the container 24 can be reduced, and the weight of the container 24 can be reduced. Moreover, the internal pressure reaction force of the tire internal pressure generated when the tire 12 is vulcanized can be reduced. Furthermore, since the inner inclined surface of the container 24 on which the outer inclined surface of the segment 14 slides is extended by attaching the outer ring 26, 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 between them.

  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 clamped by the outer ring arm 32, the tire arm 36, and the upper mold arm 38. . Thereafter, the tire transport shaft 28 is operated to transport the outer ring 26, the tire 12, and the upper mold 16 to above the mounting table 42B, and the tire arm 36 is operated to mount the tire 12 on the mounting table 42B. While the vulcanized tire 12 is mounted on the mounting table 42B, the tire 12 proceeds to the downstream cooling and inspection processes. Further, the outer ring arm 32 is operated to place the outer ring 26 (and the segment 14) on the outer ring mounting table 46.

  By doing so, the operation of taking out the tire 12 from the tire vulcanizing mold 10 is completed. The tire transport shaft 28 takes the raw tire on the mounting table 42A, returns to the container 24, and performs the next vulcanization.

  As described above, the outer inclined surface of the segment 14 and the inner inclined surface of the container 24 are set such that the sliding angle θ when the outer inclined surface of the segment 14 and the inner inclined surface of the container 24 slide is 5 to 10 °. Since the inclination angle of the surface is determined, the outer diameter of the container 24 can be reduced and the weight can be reduced. Further, the internal pressure reaction force due to the tire internal pressure generated when the tire 12 is vulcanized can be reduced.

  Further, by setting the sliding angle θ to 5 to 10 °, when forming a predetermined amount of gap W between the tread portion of the tire 12 and the inner surface of the segment 14, the outer inclined surface of the segment 14 and the container 24 Although it is necessary for the inner inclined surface to increase the sliding distance, by attaching the removable outer ring 26, the sliding distance can be increased as necessary.

  In the present embodiment, the outer ring 26 has been described as an example in which the outer ring 26 is attached by being fitted to the upper portion of the container 24. However, the present invention is not limited to this. For example, the structure attached to the container 24 using screwing members, such as a screw, may be sufficient. That is, the outer ring 26 may be configured to be detachably attached to the container 24.

1 is a schematic cross-sectional view showing a tire vulcanization mold according to an embodiment of the present invention. (A) shows the tire vulcanization mold when the tire is taken out from the tire vulcanization mold when the tire is inserted into the tire vulcanization mold or after the vulcanization is completed. It is the schematic which shows the container and segment of a tire vulcanization metal mold | die. It is the schematic which shows the opening / closing mechanism of a tire vulcanization mold.

Explanation of symbols

10 Tire vulcanization mold 12 Tire 14 Segment 24 Container 26 Outer ring (auxiliary ring)

Claims (2)

A tire vulcanization mold that vulcanizes and molds raw tires,
A segment for vulcanizing and molding the outer peripheral surface in the radial direction of the raw tire into a predetermined shape, divided into a plurality along the circumferential direction of the raw tire,
An inner inclined surface corresponding to the outer inclined surface of the segment is formed, the outer inclined surface and the inner inclined surface are slidable, and a sliding angle with respect to the inner surface of the segment is 5 to 10 °. A ring-shaped container in which the inclination angle of the inner inclined surface is determined to be,
An upper mold and a lower mold for vulcanizing and molding the sidewall portion from the side of the tread end of the green tire into a predetermined shape;
A tire vulcanization mold characterized by comprising: The tire vulcanization mold according to claim 1, wherein an auxiliary ring formed with an inner inclined surface that is an extension surface of the inner inclined surface of the container when attached is detachably attachable to the container. .

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