JP2022173899A - tire vulcanization mold - Google Patents

Abstract

To provide a tire vulcanization mold that has excellent workability and can be easily maintained.SOLUTION: A tire vulcanization mold 1 is equipped with a pair of side rings 3 for molding a sidewall part s of a tire T. At least one of the side rings 3 includes a circumferentially continuous ring body 5 and a plurality of pieces 6 attached to the ring body 5. The ring body 5 includes an annular recess 5a that is annularly recessed continuously in the circumferential direction of the mold from a side molding surface 3a for molding the sidewall part s. The piece 6 includes a plurality of first pieces 7 divided in the mold circumferential direction and at least one second piece 8 extending continuously in the circumferential direction. The first piece 7 and the second piece 8 can be mounted in the annular recess 5a. The first piece 7 is supported in the mold axial direction by fixing at least one of the second pieces 8 to the ring body 5.SELECTED DRAWING: Figure 2

Description

The present invention relates to a tire vulcanizing mold for vulcanizing a tire.

BACKGROUND Conventionally, a tire vulcanization mold is known that includes a pair of side plates for molding sidewall portions of a tire. For example, in Patent Document 1 below, an annular side ring that forms a sidewall portion of a tire includes a ring body and a plurality of pieces, so that air inside the mold is discharged from between the pieces and the ring body. A tire vulcanization mold has been proposed.

JP 2020-142459 A

However, in the tire vulcanizing mold of Patent Document 1, all the pieces are fixed with bolts, so it takes a long time to disassemble and assemble, and there is a demand for improvement in terms of maintainability.

SUMMARY OF THE INVENTION The present invention has been devised in view of the actual situation as described above, and its main object is to provide a tire vulcanization mold which is excellent in workability and which can improve maintainability.

The present invention provides a tire vulcanization mold, comprising a pair of side rings for molding a sidewall portion of a tire, at least one of the side rings comprising a ring main body continuous in the circumferential direction and the ring and a plurality of pieces attached to the main body, wherein the ring main body is formed with an annular recess that is continuously recessed in the circumferential direction of the mold from the side molding surface for molding the sidewall portion, and the piece includes a plurality of first pieces divided in the mold circumferential direction and at least one second piece extending continuously in the circumferential direction, wherein the first piece and the second piece are mounted in the annular recess The first piece is supported in the axial direction of the mold by fixing at least one of the second pieces and the ring body.

In the tire vulcanization mold of the present invention, the first piece is preferably supported in the mold circumferential direction by fixing at least one of the first pieces to the ring body.

In the tire vulcanizing mold of the present invention, it is desirable that at least a part of the periphery of the piece has an exhaust portion for exhausting the air inside the mold.

In the tire vulcanization mold of the present invention, it is preferable that the discharge portion is formed around the first piece.

In the tire vulcanization mold of the present invention, the first piece has a first molding surface that constitutes the side molding surface and a first support surface that contacts the second piece. preferably has an obtuse angle to said first molding surface.

In the tire vulcanization mold of the present invention, the second piece has a second molding surface that constitutes the side molding surface and a second support surface that contacts the first piece. preferably forms an acute angle with said second molding surface.

In the tire vulcanization mold of the present invention, the piece includes a plurality of first pieces divided in the circumferential direction and at least one second piece extending continuously in the circumferential direction. The two pieces can be mounted in the annular recess, and the first piece is supported in the axial direction of the mold by fixing at least one of the second pieces and the ring body.

Since such a piece is supported by fixing the second piece and the ring body without fixing the first piece and the ring body, disassembly and assembly can be performed in a short time. Therefore, the tire vulcanization mold of the present invention is excellent in workability and can be improved in maintainability.

1 is a cross-sectional view showing an embodiment of a tire vulcanization mold of the present invention; FIG. FIG. 2 is a partial perspective view showing a schematic configuration of the side ring of FIG. 1; FIG. 2 is an exploded perspective view showing a schematic configuration of the side ring of FIG. 1; FIG. 4 is a plan view of the first piece as seen from the first molding surface side; It is the end elevation which looked at the 1st piece at the time of mounting|wearing from the metal mold|die circumferential direction. FIG. 5 is a cross-sectional view showing a tire vulcanization mold of another embodiment; FIG. 7 is a partial perspective view showing a schematic configuration of the side ring of FIG. 6; FIG. 7 is an exploded perspective view showing a schematic configuration of the side ring of FIG. 6;

An embodiment of the present invention will be described in detail below with reference to the drawings.
FIG. 1 is a cross-sectional view showing a tire vulcanization mold 1 of this embodiment. As shown in FIG. 1, the tire vulcanization mold 1 of this embodiment includes a tread ring 2 for molding the tread portion t of the tire T and a pair of tread rings 2 for molding the sidewall portion s of the tire T. A side ring 3 is provided. It is desirable that the tire vulcanizing mold 1 further includes a pair of bead rings 4 for molding the bead portion b of the tire T. As shown in FIG.

The tread ring 2 is formed over both sides of the tire equator C of the tire T, for example. The tread ring 2 is formed by arranging a plurality of tread segments divided in the circumferential direction of the mold so that a continuous annular tread forming surface 2a is formed on the inner side in the radial direction of the mold. desirable. Here, the tread molding surface 2a is a molding surface for molding the outer surface of the tread portion t. Moreover, the die circumferential direction is the same direction as the tire circumferential direction, and the die radial direction is the same direction as the tire radial direction.

The side ring 3 of this embodiment is arranged inside the tread ring 2 in the mold radial direction. It is preferable that the side ring 3 is formed with an annular continuous side molding surface 3a on the inner side in the axial direction of the mold. Here, the side molding surface 3a is a molding surface for molding the outer surface of the sidewall portion s. Moreover, the mold axial direction is the same direction as the tire axial direction.

The bead ring 4 is desirably arranged inside the side ring 3 in the mold radial direction. The bead ring 4 has, for example, a bead forming surface 4a that is annularly continuous on the inner side in the axial direction of the mold and the outer side in the radial direction of the mold. Here, the bead forming surface 4a is a forming surface for forming the outer surface of the bead portion b. The bead ring 4 may be configured integrally with the side ring 3, for example.

2 is a partial perspective view showing a schematic configuration of the side ring 3 of FIG. 1, and FIG. 3 is an exploded perspective view showing a schematic configuration of the side ring 3 of FIG. As shown in FIGS. 2 and 3 , at least one of the side rings 3 , in this embodiment both of the pair of side rings 3 , includes a ring body 5 continuous in the circumferential direction and a plurality of ring bodies attached to the ring body 5 . and piece 6 of .

The ring main body 5 of the present embodiment is formed with an annular recess 5a that is annularly recessed continuously from the side molding surface 3a in the mold circumferential direction. Such an annular recess 5a can support the piece 6 in the mold radial direction.

The piece 6 of this embodiment includes a plurality of first pieces 7 divided in the mold circumferential direction and at least one second piece 8 continuously extending in the circumferential direction. Such pieces 6 can discharge the air inside the mold from between the pieces 6, and the quality of the tire T can be improved.

The first piece 7 and the second piece 8 of this embodiment can be attached to the annular concave portion 5a. Since such pieces 6 are arranged by arranging them in the annular recess 5a, workability during assembly is good.

As shown in FIGS. 1 to 3, the first piece 7 of this embodiment is supported in the mold axial direction by fixing at least one of the second pieces 8 and the ring body 5 . Since such a piece 6 is supported by fixing the second piece 8 and the ring body 5 without fixing the first piece 7 and the ring body 5, disassembly and assembly can be performed in a short time. can. Therefore, the tire vulcanization mold 1 of the present embodiment is excellent in workability and can be improved in maintainability.

As a more preferred embodiment, the second piece 8 is fixed to the ring body 5 by at least one fastener B. As shown in FIG. The fixture B is, for example, a bolt. The fixture B is preferably inserted into the mounting hole 5b of the ring body 5 and screwed into the second piece 8 to fix the second piece 8 and the ring body 5 together. Such fixtures B are excellent in workability, and can further improve maintainability of the tire vulcanization mold 1 .

The first piece 7 is supported in the mold circumferential direction by fixing at least one of the first pieces 7 , two in this embodiment, and the ring main body 5 . The first piece 7 is desirably fixed to the ring body 5 by fixing means (not shown) such as pins and keys. The fixing means for the first piece 7 may be bolts or the like, for example. By fixing at least one of the first pieces 7 and the second piece 8 to the ring body 5, such pieces 6 are fixed both in the axial direction of the mold and in the circumferential direction of the mold. The quality of the molded tire T can be stabilized.

As shown in FIG. 2, the first piece 7 has, for example, a first molding surface 7a forming the side molding surface 3a and a first support surface 7b in contact with the second piece 8. As shown in FIG. The first support surface 7b preferably has an obtuse angle θ1 with respect to the first molding surface 7a. The angle θ1 between the first supporting surface 7b and the first molding surface 7a is preferably 100 to 120°.

Since the angle θ1 between the first supporting surface 7b and the first molding surface 7a is 100° or more, the second piece 8 can reliably support the second piece 8 . By setting the angle θ1 between the first support surface 7b and the first molding surface 7a to 120° or less, it is possible to suppress chipping at the acute-angled portion and improve durability. In addition, the first support surface 7b is not limited to such an aspect, and may be formed in a stepped shape or a curved surface shape, for example.

The second piece 8 has, for example, a second molding surface 8a forming the side molding surface 3a and a second support surface 8b in contact with the first piece 7. As shown in FIG. The second support surface 8b preferably forms an acute angle θ2 with respect to the second molding surface 8a. The second support surface 8b of this embodiment is parallel to the first support surface 7b when placed in the annular recess 5a.

The angle θ2 between the second support surface 8b and the second molding surface 8a is preferably 60-80°. Since the angle θ2 between the second support surface 8b and the second molding surface 8a is 60° or more, chipping of the edge between the second support surface 8b and the second molding surface 8a is suppressed, and durability is improved. can be made Since the angle θ2 between the second support surface 8b and the second molding surface 8a is 80° or less, the first piece 7 can be reliably supported. In addition, the first support surface 7b is not limited to such an aspect, and may be formed corresponding to the shape of the first support surface 7b, for example.

At least part of the periphery of the piece 6 preferably has an exhaust 9 for exhausting the air inside the mold. Such a discharge portion 9 can smoothly discharge the air inside the mold and prevent the outflow of the rubber of the tire T to be vulcanized and molded.

4 is a plan view of the first piece 7 viewed from the first molding surface 7a side, and FIG. 5 is an end view of the first piece 7 when mounted, viewed from the mold circumferential direction. As shown in FIGS. 4 and 5, the discharge section 9 of this embodiment is formed around the first piece 7 . The discharge part 9 communicates with the inside of the mold by opening at least on the side of the first molding surface 7a.

Such a discharge part 9 is provided between the first pieces 7 adjacent in the mold circumferential direction, between the first pieces 7 adjacent in the mold radial direction and the ring body 5 (shown in FIG. 2), and between the metal molds. Air can be evacuated from between a first piece 7 and a second piece 8 (shown in FIG. 2) which are radially adjacent to the mold.

The discharge part 9 preferably forms a minute gap with a width w of 0.01 to 0.05 mm between the adjacent first piece 7, second piece 8 or ring body 5. As shown in FIG. Since the width w of the discharge portion 9 is 0.01 mm or more, the air inside the mold can be reliably discharged. Since the width w of the discharge portion 9 is 0.05 mm or less, it is possible to suppress the outflow of the rubber of the vulcanized tire T.

As shown in FIG. 5 , the first piece 7 of this embodiment has an exhaust passage 10 that communicates with the exhaust portion 9 . The exhaust path 10 is formed, for example, continuously in the circumferential direction of the mold. Desirably, the depth d of the exhaust passage 10 is greater than the width w of the discharge portion 9 . The exhaust path 10 communicates with the outside of the tire vulcanization mold 1 via, for example, an exhaust port (not shown). Such an exhaust passage 10 can smoothly discharge the air inside the mold discharged through the discharge portion 9 to the outside of the tire vulcanizing mold 1 .

As shown in FIGS. 2 and 3, in the process of assembling the side ring 3 of this embodiment, first, the process of mounting the first piece 7 to the annular recess 5a of the ring body 5 is performed. It is desirable that the first piece 7 that is fixed to the ring body 5 is installed first. Therefore, in the assembling process, after the step of fixing one of the first pieces 7 to the ring body 5 with the fixture B, the other first pieces 7 are attached. Such an assembly process facilitates mounting of the first piece 7, and can improve workability.

Next, the assembly process of this embodiment includes the step of mounting the second piece 8 in the annular recess 5a so that the second support surface 8b of the second piece 8 contacts the first support surface 7b of the first piece 7. done. In the assembling process of this embodiment, next, the process of fixing the second piece 8 and the ring body 5 with the fixture B is performed. In such an assembling process, there are few steps for fixing with the fixture B, the workability is excellent, and the maintainability of the tire vulcanization mold 1 can be improved.

FIG. 6 is a cross-sectional view showing a tire vulcanization mold 11 of another embodiment. Elements having the same functions as those of the above-described embodiments are denoted by the same reference numerals, and descriptions thereof are omitted. As shown in FIG. 6 , the tire vulcanization mold 1 of this embodiment includes a tread ring 2 , a pair of side rings 13 and a pair of bead rings 4 . The side ring 13 of this embodiment is for molding the sidewall portion s of the tire T, like the side ring 3 described above.

7 is a partial perspective view showing a schematic configuration of the side ring 13 of FIG. 6, and FIG. 8 is an exploded perspective view showing a schematic configuration of the side ring 13 of FIG. As shown in FIGS. 6-8, at least one of the side rings 13, in this embodiment both of the pair of side rings 13, has a circumferentially continuous ring body 15, similar to the side rings 3 described above, and and a plurality of pieces 16 attached to the ring body 15 .

The piece 16 of this embodiment includes a plurality of first pieces 17 divided in the mold circumferential direction and at least one second piece 18 continuously extending in the circumferential direction, similar to the piece 6 described above. . The first piece 17 and the second piece 18 of this embodiment are mountable in an annular recess 15 a formed in the ring body 15 .

The first piece 17 includes, for example, a first inner piece 19 on the inner side in the mold radial direction and a first outer piece 21 on the outer side of the first inner piece 19 in the mold radial direction. The second piece 18 includes, for example, a second inner piece 20 radially inward of the mold and a second outer piece 22 radially outward of the second inner piece 20 .

The pieces 16 of this embodiment are arranged in the annular recess 15a of the ring body 15 from the radially inner side of the mold in the order of a first inner piece 19, a second inner piece 20, a first outer piece 21 and a second outer piece 22. is worn with By fixing the second inner piece 20 and the second outer piece 22 to the ring body 15, the piece 16 can support the first inner piece 19 and the first outer piece 21 in the mold axial direction. can.

As shown in FIG. 7, the first inner piece 19 has, for example, a first inner molding surface 19a that forms the side molding surface 13a and a first inner support surface 19b that contacts the second inner piece 20. ing. The first inner support surface 19b preferably has an obtuse angle θ3 with respect to the first inner molding surface 19a. The angle θ3 between the first inner support surface 19b and the first inner molding surface 19a is preferably 100-120°.

The second inner piece 20 includes, for example, a second inner molding surface 20a forming the side molding surface 13a, a second inner support surface 20b in contact with the first inner piece 19, and a second inner support surface 20b in contact with the first outer piece 21. and an inner outer end surface 20c. The second inner support surface 20b preferably forms an acute angle θ4 with respect to the second inner molding surface 20a. The angle θ4 between the second inner support surface 20b and the second inner molding surface 20a is preferably 60-80°. The second inner outer end surface 20c preferably has an angle θ5 of 60-90° with respect to the second inner molding surface 20a.

The first outer piece 21 includes, for example, a first outer molding surface 21a that forms the side molding surface 13a, a first outer support surface 21b that contacts the second outer piece 22, and a first inner piece 20 that contacts the second inner piece 20. It has an outer inner end face 21c. The first outer support surface 21b preferably has an obtuse angle θ6 with respect to the first outer molding surface 21a. The angle θ6 between the first outer supporting surface 21b and the first outer molding surface 21a is preferably 100-120°. The first outer inner end surface 21c preferably forms an angle θ7 of 90 to 120° with respect to the first outer molding surface 21a.

The second outer piece 22 has, for example, a second outer molding surface 22a that forms the side molding surface 13a and a second outer support surface 22b that contacts the first outer piece 21 . The second outer support surface 22b preferably forms an acute angle θ8 with respect to the second outer molding surface 22a. The angle θ8 between the second outer support surface 22b and the second outer molding surface 22a is preferably 60-80°.

As shown in FIG. 8, the process of assembling the side ring 13 of this embodiment is similar to the process of assembling the side ring 3 described above. is done. The first inner pieces 19 are preferably mounted first and fixed to the ring body 15 , similar to the first pieces 7 described above.

The assembly process of this embodiment then proceeds to the step of fitting the second inner piece 20 into the annular recess 15 a so that the second inner piece 20 contacts the first inner piece 19 . In the assembly process of this embodiment, next, the process of fixing the second inner piece 20 and the ring body 15 with the fixture B is performed.

In the assembly process of this embodiment, next, the process of attaching the first outer piece 21 to the annular recess 15a of the ring body 15 is performed. The first outer pieces 21 are preferably mounted first and fixed to the ring body 15, with one first outer piece 21 fixed to the ring body 15 similar to the first inner piece 19 described above.

The assembly process of this embodiment then includes the step of fitting the second outer piece 22 into the annular recess 15 a so that the second outer piece 22 contacts the first outer piece 21 . In the assembly process of this embodiment, next, the process of fixing the second outer piece 22 and the ring body 15 with the fixture B is performed. In such an assembling process, there are few steps of fixing with the fixture B, the workability is excellent, and the maintainability of the tire vulcanization mold 11 can be improved.

Although the particularly preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and can be implemented in various modified forms.

Tire vulcanizing molds of the examples shown in Figs. 1 to 5 were prototyped, and the time required for assembly was measured. As a comparative example, the number of bolts required for fixation was compared using a tire vulcanization mold in which all the first pieces are fixed with bolts. The results are shown as an index with the comparative example being 100, and the smaller the number, the smaller the number of bolts required for fixation and the better the workability.

The results of the tests are shown below.
Comparative example: 100
Examples: 25

As a result of the test, it was confirmed that the tire vulcanization molds of Examples required fewer bolts for fixing, had superior workability, and improved maintainability compared to Comparative Examples.

REFERENCE SIGNS LIST 1 tire vulcanization mold 3 side ring 3a side molding surface 5 ring main body 5a annular concave portion 6 piece 7 first piece 8 second piece

Claims (6)

A tire vulcanization mold,
Equipped with a pair of side rings for molding the sidewall portion of the tire,
at least one of the side rings includes a circumferentially continuous ring body and a plurality of pieces attached to the ring body;
The ring main body is formed with an annular recess that is annularly recessed continuously in the circumferential direction of the mold from a side molding surface for molding the sidewall portion,
The pieces include a plurality of first pieces divided in the mold circumferential direction and at least one second piece extending continuously in the circumferential direction,
The first piece and the second piece are attachable to the annular recess,
The first piece is supported in the mold axial direction by fixing at least one of the second pieces and the ring body,
Tire vulcanization mold. The tire vulcanization mold according to claim 1, wherein the first piece is supported in the mold circumferential direction by fixing at least one of the first pieces to the ring body. 3. The tire vulcanizing mold according to claim 1 or 2, wherein at least part of the periphery of said piece has an exhaust for exhausting air inside the mold. 4. The tire vulcanizing mold according to claim 3, wherein the discharge portion is formed around the first piece. The first piece has a first molding surface that constitutes the side molding surface and a first support surface that contacts the second piece,
The tire vulcanizing mold according to any one of claims 1 to 4, wherein the first support surface has an obtuse angle with respect to the first molding surface. The second piece has a second molding surface that constitutes the side molding surface and a second support surface that contacts the first piece,
6. The tire vulcanizing mold of any one of claims 1 to 5, wherein the second support surface forms an acute angle with the second molding surface.

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