JP7121643B2 - Tire vulcanization mold - Google Patents

Description

The present invention relates to a tire vulcanizing mold.

Conventionally, as a tire vulcanizing mold for manufacturing a pneumatic tire by vulcanizing a green tire, a plurality of sectors arranged annularly along the tire circumferential direction and forming a tread portion and a shoulder portion, and a plurality of sectors A split-type tire vulcanizing mold is known that includes a pair of upper and lower side plates that are arranged radially inward of a sector and form a sidewall portion.

For example, in Patent Document 1, a sector of a tire vulcanizing mold is made of aluminum, and a metal material having a higher elastic limit than that of aluminum is placed on the shoulder portion forming surface of the sector so as to suppress wear of the mold. A segmented tire vulcanizing mold is disclosed.

JP-A-8-103911

A split-type tire vulcanizing mold is attached to a vulcanization molding machine so that it can be moved vertically and radially in a state in which a plurality of sectors are supported by respective supports. When the tire vulcanizing mold mounted on the vulcanizing machine is closed, the sectors are moved downward while being supported by the support, and then moved inward in the tire radial direction. The supported sectors may loose and interfere with adjacent sectors or side plates, resulting in wear.

When a sector of a tire vulcanizing mold interferes with an adjacent sector or side plate and wears out, when the tire forming surface side of the mating surface with the adjacent sector or side plate interferes with wear and wears out, the sector on the pneumatic tire Molding defects may occur due to wear of the mating surfaces.

For this reason, when the mating surfaces of the sectors wear, it is necessary to carry out mold maintenance to correct the worn portions of the sectors by overlay repair, etc., so as to suppress the occurrence of molding defects due to the wear of the mating surfaces of the sectors. , the work time for mold maintenance becomes longer.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a tire vulcanization mold that can improve the workability of mold maintenance and suppress the occurrence of defective molding due to wear of the mating surfaces of the sectors.

The present invention provides a tire vulcanization mold for vulcanization molding of a green tire, comprising a plurality of sectors arranged annularly along the tire circumferential direction and configured to be movable in the tire radial direction, A mating surface forming member that forms a predetermined region of the mating surface of the sector on the tire molding surface side is replaceably attached to at least one sector among the plurality of sectors, and the mating surface forming member is the tire of the sector. A tire vulcanizing mold is provided that is attached to the sectors using fasteners that are inserted from the radially outer side .

According to the present invention, even when wear occurs on the tire molding surface side of the mating surface of at least one sector among a plurality of sectors, it is possible to easily replace the mating surface forming member with a new one, thus reducing mold maintenance. It is possible to improve the workability and suppress the occurrence of defective molding due to wear of the mating surfaces of the sectors.
Moreover, compared with the case where the fastening member is attached from the mating surface side, the mating surfaces of the sectors can be formed with high accuracy, and the green tire can be vulcanized with high accuracy.

It is preferable that the mating surface forming member is made of a material having a higher modulus of elasticity than the sector.

According to this configuration, it is possible to suppress the occurrence of wear on the tire molding surface side of the mating surface of the sector compared to the case where the mating surface forming member is formed of the same material as the sector. Productivity can be improved by reducing the replacement frequency of the constituent members.

The mating surface forming member may be made of the same material as the sector.

According to this configuration, compared to the case where the mating surface forming member is not made of the same material as the sector, dimensional changes due to thermal expansion of the sector and the mating surface forming member during vulcanization molding can be equalized. , the green tire can be vulcanized with high accuracy.

It is preferable that the tire vulcanizing mold includes a side plate arranged radially inward of the sector, and the mating surface forming member constitutes a tire molding surface side of the mating surface with the side plate.

According to this configuration, the sector is formed by the mating surface forming member on the tire molding surface side of the mating surface with the side plate where wear is likely to occur. can be planned.

The sector includes a rib portion forming a main groove extending in the tire circumferential direction on the tire molding surface, and the mating surface forming member is on the tire molding surface side including the rib portion on the mating surface of the sector adjacent in the tire circumferential direction. It is preferable to configure

According to this configuration, since the tire molding surface side including the bone portion in the mating surface of the adjacent sector where wear is likely to occur is composed of the mating surface forming member, the workability of mold maintenance is improved and molding defects are prevented. It is possible to effectively suppress the occurrence.

The present invention also provides a tire vulcanization mold for vulcanization molding of a green tire, comprising a plurality of sectors arranged annularly along the tire circumferential direction and configured to be movable in the tire radial direction, A mating surface forming member that constitutes a predetermined region on the tire molding surface side of the mating surface of the sector is replaceably attached to at least one sector among the plurality of sectors, and is arranged inside the sector in the tire radial direction. A side plate is provided, and the mating surface forming member constitutes the tire molding surface side of the mating surface with the side plate, and the tire diameter on both sides of the sector in the tire circumferential direction is larger than that on the center side of the sector in the tire circumferential direction. To provide a mold for vulcanizing a tire formed to have a large size in a direction.

According to the present invention, even when wear occurs on the tire molding surface side of the mating surface of at least one sector among a plurality of sectors, it is possible to easily replace the mating surface forming member with a new one, thus reducing mold maintenance. It is possible to improve the workability and suppress the occurrence of defective molding due to wear of the mating surfaces of the sectors.
In addition, since the sector is formed of the mating surface forming member on the tire molding surface side of the mating surface with the side plate where wear is likely to occur, it is possible to effectively improve the workability of mold maintenance and suppress the occurrence of molding defects. can.

According to the tire vulcanizing mold according to the present invention, it is possible to improve the workability of mold maintenance and to suppress the occurrence of molding defects due to wear of the mating surfaces of the sectors.

1 is a sectional view showing a vulcanizing machine equipped with a tire vulcanizing mold according to a first embodiment of the present invention; FIG. FIG. 4 is a schematic explanatory view showing a mold closing operation of a tire vulcanizing mold; 1 is a perspective view of a sector of a tire vulcanizing mold; FIG. FIG. 4 is a sectional view of a sector along line Y4-Y4 in FIG. 3; FIG. 4 is a cross-sectional view of a modified sector of the tire vulcanizing mold according to the first embodiment of the present invention; FIG. 5 is a perspective view of another modification of the sectors of the tire vulcanizing mold according to the first embodiment of the present invention; FIG. 5 is a perspective view of a sector of a tire vulcanizing mold according to a second embodiment of the present invention; FIG. 8 is a sectional view of the sector along line Y8-Y8 in FIG. 7;

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing a vulcanization molding machine equipped with a tire vulcanization mold according to a first embodiment of the present invention. As shown in FIG. 1, a tire vulcanizing mold 2 according to the first embodiment of the present invention is mounted on a vulcanizing machine 1, and an upper plate 3, an upper platen 4 and a lower platen of the vulcanizing machine 1 are mounted. 5 via a container 6.

The upper plate 3 is fixed to the lower end of the lifting cylinder 7 . A lifting rod 8 is arranged in the center of the lifting cylinder 7 . An upper platen 4 arranged below the upper plate 3 is fixed to the lower end of the lifting rod 8 . The lifting cylinder 7 and the lifting rod 8 are lifted and lowered by a drive mechanism (not shown). The upper platen 4 is formed with a flow path 4a through which a heat exchange medium such as oil flows so that the temperature can be controlled by the heat exchange medium.

Similarly to the upper platen 4, the lower platen 5 is formed with a flow path 5a through which a heat exchange medium such as oil flows so that the temperature can be controlled by the heat exchange medium. The tire vulcanizing mold 2 is heated to a desired vulcanizing temperature via the upper platen 4 and the lower platen 5 by adjusting the temperature of the heat exchange medium.

A bladder unit 9 is arranged in the center of the lower platen 5 . The bladder unit 9 has a bladder 13 attached to an upper clamp 11 and a lower clamp 12 fixed to a support shaft 10 that can be raised and lowered. Air is supplied to and discharged from a space surrounded by the upper clamp 11, the lower clamp 12 and the bladder 13 by an air supply/exhaust device (not shown). The bladder 13 is supplied with air and swells toward the outer periphery to support the green tire GT from the inside.

The container 6 is composed of a segment 14 , a jacket ring 15 , an upper container plate 16 and a lower container plate 17 .

The segments 14 fix a plurality of sectors 30 of the tire vulcanizing mold 2, which will be described later, with fastening bolts (not shown). is composed of seven segments 14 .

The tire radially inner surface of the segment 14 is formed along the tire radially outer surface of the sector 30, and the tire radially outer surface of the segment 14 is an outer periphery that is an inclined surface that gradually slopes outward in the tire radial direction toward the lower side. It is constituted by a side conical surface 14a. Each segment 14 is supported by an upper slide 18 so as to be able to reciprocate in the tire radial direction.

The jacket ring 15 is formed in a hollow cylindrical shape and has an upper end fixed to the upper plate 3 . As a result, the jacket ring 15 moves up and down according to the up-and-down motion of the elevating cylinder 7 . The inner surface of the jacket ring 15 is composed of an inner peripheral conical surface 15a that is an inclined surface that gradually inclines outward in the tire radial direction toward the lower side.

An inner conical surface 15 a of the jacket ring 15 is formed corresponding to the outer conical surface 14 a of the segment 14 and is formed to be movable along the outer conical surface 14 a of the segment 14 . The inner conical surface 15a of the jacket ring 15 and the outer conical surface 14a of the segment 14 are formed so as not to be separated from each other by a tenon and dovetail structure, for example.

As a result, when the jacket ring 15 is lowered, the inner conical surface 15a presses the outer conical surface 14a of the segment 14, and the segment 14 located radially outward is annularly connected radially inward. be moved. Also, when the jacket ring 15 is lifted, the segment 14 positioned radially inward is moved radially outward.

The upper container plate 16 has an upper slide 18 as a support member fixed to the lower surface on the outer peripheral side, and an upper side plate 21, which will be described later, is fixed to the lower surface on the inner peripheral side. The upper container plate 16 is fixed to the lower surface of the upper platen 4 . As a result, when the lifting rod 8 is moved up and down, the upper side plate 21, the segment 14 and the sector 30 are moved up and down together with the upper platen 4 and the upper container plate 16. FIG.

The lower container plate 17 has a lower slide 19 fixed to the upper surface on the outer peripheral side and a lower side plate 21 to be described later fixed to the upper surface on the inner peripheral side. The segment 14 is placed on the lower slide 19 when the mold is closed, and the lower slide 19 supports the segment 14 so as to be movable in the tire radial direction. The lower container plate 17 is fixed to the upper surface of the lower platen 5 on the outer peripheral side.

The tire vulcanizing mold 2 has a plurality of sectors 30 arranged in an annular shape along the tire circumferential direction and having a tire molding surface for molding a tread portion and a shoulder portion of the pneumatic tire, and the tire diameters of the plurality of sectors 30. It is provided with a pair of upper and lower side plates 21 which are arranged on the inner side of the direction and have tire molding surfaces for molding sidewall portions of the pneumatic tire.

The pair of upper and lower side plates 21 are each formed in an annular shape. A pair of upper and lower bead rings 23 having tire forming surfaces for forming the bead portions of the pneumatic tire are fixed to the inside of the pair of upper and lower side plates 21 in the tire radial direction.

The upper side plate 21 is fixed to the upper container plate 16 and lifted and lowered according to the lifting motion of the lifting rod 8 . The upper side plate 21 presses the bead portion of the green tire GT by the bead ring 23 when it is lowered. The tire molding surface of the upper side plate 21 and the tire molding surface of the upper bead ring 23 form one sidewall portion and bead portion of the pneumatic tire.

The lower side plate 21 is fixed to the lower container plate 17 . The tire molding surface of the lower side plate 21 and the tire molding surface of the lower bead ring 23 form the other sidewall portion and the bead portion of the pneumatic tire.

FIG. 2 is a schematic explanatory view showing the mold closing operation of the tire vulcanizing mold. When manufacturing a pneumatic tire by vulcanizing the green tire GT using the vulcanizing machine 1 equipped with the tire vulcanizing mold 20, first, as shown in FIG. In the open state of the mold 20, the green tire GT is placed on the lower side plate 21 so that the axial direction of the green tire GT is in the vertical direction. At this time, the bead portion positioned on the lower side of the green tire GT is positioned on the bead ring 23 on the lower side.

Next, as shown in FIG. 2B , air is supplied into the bladder 13 to inflate the bladder 13 , and the inner surface of the green tire GT is held on the outer surface of the bladder 13 . As a result, the green tire GT is supported by the bead ring 23 and the bladder 13 on the lower side and is kept out of contact with the side plate 21 on the lower side.

Then, by driving a driving device (not shown), the lifting rod 8 and the lifting cylinder 7 are lowered to start the mold closing operation. When the lifting rod 8 and the lifting cylinder 7 are lowered, the upper bead ring 23 is brought into contact with the upper bead portion of the green tire GT as shown in FIG. After the green tire GT is deformed by the bead ring 23 on the upper side, the side plate 21 on the upper side is brought into contact with the green tire GT.

As shown in FIG. 2( e ), at a predetermined mold closing completion position where mold closing is completed after the upper side plate 21 comes into contact with the green tire GT, the lowering operation of the lifting rod 8 is stopped and the upper side plate 21 is stopped. The descent of plate 21 is stopped. By lowering the upper side plate 21 to the mold closing completion position, the green tire GT is sandwiched between the upper side plate 21 and the lower side plate 22 .

Even after the upper side plate 21 is lowered to the mold closing completion position, it is lowered by the elevation cylinder 7 and the jacket ring 15 is moved downward together with the upper plate 3 . When the jacket ring 15 is moved downward, the inner conical surface 15a presses the outer conical surface 14a of the segment 14 to move the sector 30 fixed to the segment 14 radially inward.

As shown in FIG. 2(f), a plurality of sectors 30 arranged in the tire circumferential direction are combined with sectors 30 adjacent to each other in the tire circumferential direction to form a plurality of sectors 30 in an annular shape. 30 are aligned with the pair of upper and lower side plates 21, respectively, the descent by the lifting cylinder 7 is completed, and the mold closing operation is completed.

At this time, the outer surface of the green tire GT is pressed by the upper and lower side plates 21 and the sectors 30 and the inner surface thereof is pressed by the bladder 13 . A heat exchange medium whose temperature is controlled so as to vulcanize the green tire GT at a predetermined vulcanizing temperature is constantly flowing through the upper platen 4 and the lower platen 5 . As a result, the green tire GT is vulcanized to manufacture a pneumatic tire.

Next, the tire vulcanizing mold according to this embodiment will be further described.
3 is a perspective view of a sector of a tire vulcanizing mold, and FIG. 4 is a cross-sectional view of the sector along line Y4-Y4 in FIG. The sectors 30 of the tire vulcanizing mold 2 are formed in the same way. As shown in FIGS. 3 and 4, the sectors 30 have end surfaces 31 on both sides in the tire circumferential direction that extend in a direction orthogonal to the tire circumferential direction, and serve as mating surfaces for the adjacent sectors 30 when the mold is closed. Abutting and mating.

The sector 30 has a tire forming surface 33 for forming a tread portion and a shoulder portion of the pneumatic tire on the center side in the tire width direction of the tire radially inner end surface 32 , and the tire forming surface 33 on the tire radially inner end surface 32 on the tire width direction outer side. has a mating surface 34 with the side plate 21.

The tire molding surface 33 of the sector 30 is provided so that the center side in the tire width direction bulges outward in the tire width direction compared to the outer side in the tire width direction, and the center side in the tire width direction and the outer side in the tire width direction are the tread portion and the outer side in the tire width direction, respectively. It is formed corresponding to the shape of the shoulder portion. On the tire forming surface 33 of the sector 30, a plurality of bone portions 33a, four bone portions 33a in the present embodiment, forming a main groove extending in the tire circumferential direction of the pneumatic tire, extend inward in the tire radial direction and have a generally rectangular cross section. provided to protrude.

In the sector 30 , a mating surface 34 of the radially inner end surface 32 with the side plate 21 on the tire width direction outer side is formed in a substantially circular arc shape in the tire circumferential direction. In the sector 30 , a predetermined region on the side of the tire forming surface, which is the inner side in the tire width direction, of the mating surface 34 with the side plate 21 is formed by the mating surface forming member 40 .

The mating surface forming member 40 is formed in an arc shape in the tire circumferential direction and is formed in a substantially rectangular shape in a cross section orthogonal to the tire circumferential direction. The mating surface forming member 40 is arranged in a mounting recess 35 that is recessed in the sector 30 corresponding to the mating surface forming member 40 .

As shown in FIG. 4, the sector 30 is provided with a bolt insertion hole 36 into which a fastening bolt B1 as a fastening member is inserted from the outside in the tire radial direction. A bolt receiving hole 37 for receiving the head of the fastening bolt B1 is provided outside the bolt insertion hole 36 in the tire radial direction. The mating surface forming member 40 is provided with screw holes 41 corresponding to the bolt insertion holes 36 of the sectors 30 on the outer surface in the tire radial direction.

The mating surface forming member 40 is replaceably attached to the sector 30 by screwing the fastening bolt B1 into the screw hole 41 through the bolt insertion hole 36 of the sector 30 . The mating surface forming member 40 is detachably attached to the sector 30 as a replacement part. In this embodiment, the mating surface forming member 40 is attached to the sector 30 using three fastening bolts B1, but one or more fastening bolts, preferably two or more fastening bolts are used. It is replaceably attached to sector 30 .

In the sector 30, a female screw is formed in the bolt insertion hole 36, and an approximately cylindrical Ensat 45 is attached to the female screw. The ensert 45 has a male thread on its outer periphery and a female thread on its inner periphery, and is made of a material having a hardness higher than that of the sector 30 .

Ensert 45 is screwed into the female thread of bolt insertion hole 36 and attached to bolt insertion hole 36 . The fastening bolt B<b>1 is screwed into the screw hole 41 through the bolt insertion hole 36 of the sector 30 while being screwed into the female thread of the Ensat 45 .

FIG. 4 shows the mating surface forming member 40 that is attached to the sector 30 and constitutes the tire molding surface side that is the inner side in the tire width direction of the mating surface 34 with the upper side plate 21, but the lower side plate. The mating surface forming member that constitutes the tire molding surface side, which is the inner side in the tire width direction, of the mating surface 34 with 21 is similarly configured.

In the tire vulcanization mold 2, the size D1 in the tire radial direction of the mating surface forming member 40 replaceably attached to the sector 30 is set to, for example, 15 to 60 mm, and the size H1 in the tire width direction is set to For example, it is set to 5 to 30 mm. The size D1 of the mating surface forming member 40 in the tire radial direction may be set to, for example, 15 to 60% of the size of the sector 30 in the tire radial direction.

The sector 30 is made of an aluminum-based material such as an Al--Mg-based aluminum alloy or an Al--Si--Mg-based aluminum alloy, and the elastic modulus of the sector 30 is set to about 67 to 74 GPa, for example. The mating surface forming member 40 is made of a ferrous material such as carbon steel for machine structural use (SC material), and the elastic modulus of the mating surface forming member 40 is set at, for example, about 210 GPa. The mating surface forming member 40 is made of a material having a higher modulus of elasticity than the sector 30 . Ensat 45 is made of a harder material than sector 30, such as stainless steel.

In this embodiment, a plurality of sectors 30 of the tire vulcanizing mold 2 are formed in the same manner, and the tire molding surface side of the mating surface 34 of the sector 30 is constituted by the replaceable mating surface forming member 40. It is also possible to replaceably attach to at least one sector 30 a mating surface forming member that constitutes a predetermined region of the mating surface 34 of the sector 30 on the tire molding surface side.

As described above, the tire vulcanizing mold 2 according to the present embodiment includes a plurality of sectors 30 arranged annularly along the tire circumferential direction and configured to be movable in the tire radial direction. At least one sector 30 of the 30 is replaceably attached with a mating surface forming member 40 that forms a predetermined region of the mating surface 34 of the sector 30 on the tire molding surface side.

As a result, even if wear occurs on the tire molding surface side of the mating surface 34 of at least one sector 30 among the plurality of sectors 30, it is possible to easily replace the mating surface forming member 40 with a new mating surface forming member 40, thereby reducing mold maintenance. The workability of the sector 30 can be improved, and the occurrence of defective molding due to wear of the mating surface 34 of the sector 30 can be suppressed.

Also, the mating surface forming member 40 is made of a material having a higher elastic modulus than the sector 30 . As a result, as compared with the case where the mating surface forming member 40 is made of the same material as the sector 30, it is possible to suppress the occurrence of wear on the tire molding surface side of the mating surface 34 of the sector 30. The productivity can be improved by reducing the replacement frequency of the surface forming member 40 .

When the sector 30 is formed from an aluminum-based material and the mating surface constituent member 40 is formed from an iron-based material, the tire forming surface side of the mating surface 34 of the sector 30 is constituted by the mating surface constituent member 40, which results in an increase in weight. can be suppressed to suppress the deterioration of workability.

In addition, the tire vulcanizing mold 2 includes a side plate 21 arranged radially inward of the plurality of sectors 30, and the mating surface forming member 40 is located on the tire molding surface side of the mating surface 34 with the side plate 21. configure. As a result, the sector 30 is configured by the mating surface forming member 40 on the side of the tire molding surface of the mating surface 34 with the side plate 21, which is likely to be worn, so that the workability of mold maintenance can be improved and the occurrence of molding defects can be suppressed. It can be done effectively.

Also, the mating surface forming member 40 is attached to the sector 30 using a fastening member B1 inserted from the outside of the sector 30 in the tire radial direction. As a result, the mating surfaces of the sector 30 can be formed with high precision, and the green tire GT can be vulcanized with high precision, as compared with the case where the fastening member is attached from the mating surface side.

In this embodiment, the mating surface forming member 40 is made of a material having a higher elastic modulus than the sector 30, but may be made of the same material as the sector 30.

In such a case, compared to the case where the mating surface forming member 40 is not made of the same material as the sector 30, the dimensional change due to thermal expansion of the sector 30 and the mating surface forming member 40 during vulcanization molding can be equalized. Therefore, the green tire GT can be vulcanized with high accuracy.

FIG. 5 is a cross-sectional view of a modified sector of the tire vulcanizing mold according to the first embodiment of the present invention. FIG. 5 shows a sector variant with a cross-section corresponding to the cross-section of the sector 30 shown in FIG. As shown in FIG. 5, the mating surface forming member 50 replaceably attached to the sector 30' is provided on both sides of the sector 30' in the tire circumferential direction, which is the mating surface side of the adjacent sector 30' where wear is likely to occur. It is also possible to form the size in the tire radial direction larger than the center side in the tire circumferential direction of 30'. Also in this case, the mounting recess 55 formed in the sector 30 ′ is formed corresponding to the mating surface forming member 50 .

FIG. 6 is a perspective view of another modification of the sector of the tire vulcanizing mold according to the first embodiment of the present invention. As shown in FIG. 6 , the mating surface forming member 60 replaceably attached to the sector 30 ″ is arranged in the tire circumferential direction of the sector 30 ″ which is the mating surface side of the adjacent sector 30 ″ where wear is likely to occur. It is also possible to provide only on both sides and not to provide on the central side in the tire circumferential direction.

Also in this case, the mounting recesses 65 formed in the sectors 30'' are formed corresponding to the mating surface forming members 60, and the mating surface forming members 60 are respectively fitted into the bolt insertion holes provided in the sectors 30''. It is replaceably attached to the sector 30'' by a fastening bolt inserted from the tire radial outside.

7 is a perspective view of a sector of a tire vulcanizing mold according to a second embodiment of the present invention, and FIG. 8 is a cross-sectional view of the sector along line Y8-Y8 in FIG. The sector of the tire vulcanizing mold according to the second embodiment is further attached with a mating surface forming member that constitutes a mating surface between the sector of the tire vulcanizing mold according to the first embodiment and the adjacent sector. Other than that, they are the same, so descriptions of the same configurations are omitted.

Also in the sector 70 of the tire vulcanizing mold according to the second embodiment, a mating surface forming member 40 that constitutes a predetermined region on the side of the tire molding surface of the mating surface 34 with the side plate 21 is replaceably attached. .

In the sector 70 , a predetermined area on the side of the tire forming surface, which is the inner side in the tire radial direction, of the mating surface 31 with the adjacent sector 30 is formed by the mating surface forming member 80 . The mating surface forming member 80 constitutes the tire molding surface side at the center side in the tire width direction including the bone portion 33 a provided on the tire molding surface 33 . The mating surface forming member 80 extends outward from the bone portion 33a in the tire width direction and has a substantially rectangular cross section perpendicular to the tire width direction.

The mating surface forming member 80 includes an extending portion 82 that protrudes and extends in a substantially rectangular shape radially outward from the tire molding surface 33 toward the center of the sector 70 in the circumferential direction, and has a substantially L-shaped cross section when viewed in the tire width direction. formed. The mating surface forming member 80 is arranged in a mounting recess 75 that is recessed in the sector 70 corresponding to the mating surface forming member 80 .

As shown in FIG. 8, the sector 70 is provided with a bolt insertion hole 76 into which a fastening bolt B2 as a fastening member is inserted from the outside in the tire radial direction. A bolt receiving hole 77 for receiving the head of the fastening bolt B2 is provided outside the bolt insertion hole 76 in the tire radial direction. The mating surface forming member 80 is provided with a screw hole 81 corresponding to the bolt insertion hole 76 of the sector 70 on the outer surface in the tire radial direction of the extending portion 82 .

The mating surface forming member 80 is replaceably attached to the sector 70 by screwing the fastening bolt B2 into the screw hole 81 through the bolt insertion hole 76 of the sector 70 . The mating surface component 80 is interchangeably attached to the sector 70 using one or more fastening bolts, preferably two or more fastening bolts.

The sector 70 also has a female thread formed in the bolt insertion hole 76, and an approximately cylindrical ensart 85 is attached to the female thread. The ensert 85 has a male thread on its outer periphery and a female thread on its inner periphery, and is made of a material having a hardness higher than that of the sector 70 .

Ensert 85 is screwed into the bolt insertion hole 76 and attached to the bolt insertion hole 76 of the sector 70 . The fastening bolt B<b>2 is screwed into the threaded hole 81 through the bolt insertion hole 76 of the sector 70 while being screwed into the female thread of the Ensat 85 .

FIG. 8 shows a mating surface forming member 80 that is attached to the sector 70 and constitutes the tire molding surface side of the mating surface 31 that is attached to the sector 70 adjacent to the sector 70 on one side in the tire circumferential direction. The mating surface forming member 80, which constitutes the tire molding surface side of the mating surface with the adjacent sector, is similarly constructed.

In the tire vulcanizing mold 2, the mating surface forming member 80 replaceably attached to the sector 70 has a tire radial size D2 set to, for example, 15 to 70 mm, and a tire circumferential size W2 of For example, it is set to 5 to 20 mm. The size D2 of the mating surface forming member 80 in the tire radial direction may be set to, for example, 15 to 70% of the size of the sector 30 in the tire radial direction.

The sector 70 is made of an aluminum-based material such as an Al--Mg-based aluminum alloy or an Al--Si--Mg-based aluminum alloy, and the elastic modulus of the sector 70 is set to about 67 to 74 GPa, for example. The mating surface forming member 80 is formed from a ferrous material such as carbon steel for machine structural use (SC material), and the elastic modulus of the mating surface forming member 80 is set at, for example, about 210 GPa. The mating surface forming member 80 is made of a material having a higher modulus of elasticity than the sector 70 . Ensat 85 is made of a harder material than sector 70, such as stainless steel. Note that the mating surface forming member 80 may be made of the same material as the sector 70 .

In this embodiment, a plurality of sectors 70 of the tire vulcanizing mold 2 are formed in the same manner, and the tire molding surface side of the mating surface 31 of the sector 70 is constituted by a replaceable mating surface forming member 80. It is also possible to replaceably attach to at least one sector 70 a mating surface forming member that constitutes a predetermined region of the mating surface 31 of the sector 70 on the tire molding surface side.

In this embodiment, the mating surface forming member 40 forming the mating surface 34 with the side plate 21 and the mating surface forming member 80 forming the mating surface 31 with the adjacent sector 70 are exchangeably attached to the sector 70 . However, it is also possible to attach only the mating surface forming member 80 that forms the mating surface 31 with the adjacent sector 70 .

In this embodiment, the mating surface forming member 80 that is replaceably attached to the sector 70 and constitutes the mating surface 31 with the adjacent sector 70 is provided only on the center side in the tire width direction. As shown by the dotted chain line L1, it is also possible to provide the entire tire width direction from the center side in the tire width direction to both sides in the tire width direction.

As described above, the tire vulcanizing mold 2 according to the present embodiment also includes a plurality of sectors 30 and 70 arranged annularly along the tire circumferential direction and configured to be movable in the tire radial direction, At least one sector 30, 70 out of the plurality of sectors 30, 70 is replaceably attached with a mating surface forming member 40, 80 that constitutes a predetermined region on the tire forming surface side of the mating surface 34, 31 of the sector 30, 70. It is

As a result, even when wear occurs on the tire forming surface side of the mating surfaces 34, 31 of at least one sector 30, 70 among the plurality of sectors 30, 70, the mating surface forming members 40, 80 can be easily replaced with new mating surface forming members 40, 80. Therefore, it is possible to improve the workability of mold maintenance and suppress the occurrence of molding defects due to wear of the mating surfaces 34 and 31 of the sectors 30 and 70 .

The sector 70 includes a rib portion 33a forming a main groove extending in the tire circumferential direction in the tire forming surface 33, and the mating surface forming member 80 forms the rib portion 33a in the mating surface 31 of the sector 70 adjacent in the tire circumferential direction. forming a tire molding surface side including: As a result, the tire molding surface side including the bone portion 33a of the adjacent sector 70, which is likely to be worn, is formed by the mating surface forming member 80, thereby improving the workability of mold maintenance. It is possible to effectively suppress the occurrence of molding defects.

Also, the mating surface forming member 80 is attached to the sector 70 using a fastening member B2 inserted from the outside of the sector 70 in the tire radial direction. As a result, the mating surfaces of the sector 70 can be formed with high precision, and the green tire GT can be vulcanized with high precision, as compared with the case where the fastening member is attached from the mating surface side.

In the above-described embodiment, the sectors 30 and 70 are configured such that the tire forming surface sides of the mating surfaces 34 and 31 of the sectors 30 and 70 are replaceable by the mating surface forming members 40 and 80, and the mating surfaces 34 and 34 of the sectors 30 and 70 are interchangeable. Although the side opposite to the tire forming surface of 31 is constituted by the sector body portion, it is also possible to configure the entire mating surfaces 34 and 31 of the sectors 30 and 70 to be replaceable by a mating surface forming member.

The present invention is not limited to the illustrated embodiments, and various improvements and design changes are possible without departing from the gist of the invention.

1 vulcanization molding machine 2 tire vulcanization mold 18 upper slide 21 side plates 30, 30', 30'', 70 sector 31 mating surface 33 with sector tire forming surface 33a bone portion 34 mating surface 40 with side plate , 80 mating surface forming members B1, B2 fastening bolt GT green tire

Claims (6)

A tire vulcanization mold for vulcanizing a green tire,
Equipped with a plurality of sectors annularly arranged along the tire circumferential direction and configured to be movable in the tire radial direction,
At least one of the plurality of sectors is replaceably attached with a mating surface forming member that constitutes a predetermined region on the tire molding surface side of the mating surface of the sector ,
The mating surface forming member is attached to the sector using a fastening member that is inserted from the outside of the sector in the tire radial direction.
Mold for tire vulcanization. 2. The tire vulcanization mold according to claim 1, wherein said mating surface forming member is made of a material having a higher modulus of elasticity than said sector. 2. The tire vulcanization mold according to claim 1, wherein said mating surface forming member is made of the same material as said sector. A side plate arranged radially inward of the sector,
The tire vulcanizing mold according to any one of claims 1 to 3, wherein the mating surface forming member constitutes a tire molding surface side of a mating surface with the side plate. The sector comprises a rib portion forming a main groove extending in the tire circumferential direction in the tire molding surface,
The tire vulcanizing device according to any one of claims 1 to 4, wherein the mating surface forming member constitutes a tire molding surface side including the bone portion in a mating surface with sectors adjacent in the tire circumferential direction. Mold. A tire vulcanization mold for vulcanizing a green tire,
Equipped with a plurality of sectors annularly arranged along the tire circumferential direction and configured to be movable in the tire radial direction,
At least one of the plurality of sectors is replaceably attached with a mating surface forming member that constitutes a predetermined region on the tire molding surface side of the mating surface of the sector,
A side plate arranged radially inward of the sector,
The mating surface forming member constitutes the tire molding surface side of the mating surface with the side plate, and both sides of the sector in the tire circumferential direction are larger in size in the tire radial direction than the central side of the sector in the tire circumferential direction. formed in large
Mold for tire vulcanization.

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