JP2020082511A - Tire vulcanization mold - Google Patents

Abstract

To provide a tire vulcanization mold capable of improving a workability of mold maintenance and suppressing an occurrence of molding defects due to wear of a mating surfaces of sectors.SOLUTION: A tire vulcanization mold for vulcanizing and molding a green tire includes a plurality of sectors 30 that are arranged in an annular shape along a tire circumferential direction and are movable in a tire radial direction. In at least one sector 30 of the plurality of sectors, a mating surface constituting member 40 that constitutes a predetermined area on a tire molding surface side of a mating surface 34 of the sector 30 is replaceably attached.SELECTED DRAWING: Figure 3

Description

The present invention relates to a tire vulcanizing mold.

Conventionally, as a tire vulcanization mold for vulcanizing and molding a green tire to produce a pneumatic tire, a plurality of sectors that are annularly arranged along the tire circumferential direction to form a tread portion and a shoulder portion, and a plurality of A split type tire vulcanizing mold including a pair of upper and lower side plates arranged inside the sector in the radial direction of the tire and forming a sidewall portion is known.

For example, in Patent Document 1, a sector of a mold for tire vulcanization is made of an aluminum material, and a metal material having an elastic limit higher than that of an aluminum material is arranged on a molding surface of a shoulder portion of the sector to suppress wear of the mold. There is disclosed a split type tire vulcanizing mold.

JP-A-8-103911

The split type tire vulcanization mold is mounted on a vulcanization molding machine so as to be moved in the vertical direction and in the tire radial direction while a plurality of sectors are respectively supported by a support. When the mold of the tire vulcanizing mold mounted on the vulcanization molding machine is closed, the sectors are moved to the lower side while being supported by the respective supports, and then are moved to the inner side in the tire radial direction. There is a risk of backlash occurring in the supported sectors and interference with adjacent sectors or side plates and wear.

When a sector of a tire vulcanizing mold interferes with adjacent sectors or side plates and wears out, if the tire molding surface side of the mating surface with adjacent sectors or side plates interferes and wears out, the Molding failure may occur due to wear of the mating surfaces.

For this reason, when the mating surface of the sector is worn, it is necessary to perform die maintenance to correct the worn part of the sector by overlaying or the like so as to suppress the occurrence of defective molding due to wear of the mating surface of the sector. Therefore, the work time for die maintenance becomes long.

Therefore, it is an object of the present invention to provide a tire vulcanizing mold capable of improving the workability of mold maintenance and suppressing the occurrence of molding defects due to wear of the mating surfaces of the sectors.

The present invention is a tire vulcanizing mold for vulcanizing and molding a green tire, comprising a plurality of sectors arranged annularly along the tire circumferential direction and movable in the tire radial direction, Provided is a tire vulcanization mold in which at least one sector of a plurality of sectors is replaceably attached with a mating surface constituting member that constitutes a predetermined region on the tire molding surface side of the mating surface of the sector.

According to the present invention, even when wear occurs on the tire molding surface side of the mating surface of at least one of the plurality of sectors, it is possible to easily replace it with a new mating surface constituent member. It is possible to improve workability and suppress the occurrence of defective molding due to wear of the mating surfaces of the sectors.

It is preferable that the mating surface forming member is formed of a material having a higher elastic coefficient than that of 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 as compared with the case where the mating surface forming member is formed of the same material as the sector. It is possible to reduce the frequency of exchanging the constituent members and improve the productivity.

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

According to this configuration, the dimensional change due to thermal expansion of the sector and the mating surface constituting member during vulcanization molding can be equalized as compared with the case where the mating surface constituting member is not formed of the same material as the sector. The green tire can be accurately vulcanized and molded.

It is preferable that the tire vulcanizing mold includes a side plate arranged inside a sector in a tire radial direction, and the mating surface constituting member constitutes a tire molding surface side of a mating surface with the side plate.

According to this configuration, since the tire molding surface side of the surface of the sector that is liable to wear with the side plate is configured by the mating surface constituent member, it is possible to improve the workability of mold maintenance and suppress the occurrence of molding defects. Can be achieved.

The sector includes a skeleton that forms a main groove extending in the tire circumferential direction on the tire molding surface, and the mating surface forming member includes a skeleton on a mating surface with an adjacent sector in the tire circumferential direction. Is preferably configured.

According to this structure, since the tire molding surface side including the bone portion in the mating surface with the adjacent sector where abrasion is likely to occur is configured by the mating surface constituting member, the sector improves workability in mold maintenance and molding defects. The generation can be effectively suppressed.

The mating surface forming member is preferably attached to the sector using a fastening member that is inserted from the outside of the sector in the tire radial direction.

According to this structure, compared with the case where the fastening member is attached from the mating surface side, the mating surface of the sector can be formed more accurately, and the green tire can be vulcanized and molded with higher accuracy.

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

It is sectional drawing which shows the vulcanization molding machine which mounted the metal mold|die for tire vulcanization which concerns on 1st Embodiment of this invention. It is a schematic explanatory view showing a mold closing operation of a tire vulcanizing mold. FIG. 3 is a perspective view of a sector of a tire vulcanizing mold. FIG. 4 is a sectional view of the sector taken along line Y4-Y4 in FIG. 3. It is sectional drawing of the modification of the sector of the metal mold|die for tire vulcanization which concerns on 1st Embodiment of this invention. It is a perspective view of another modification of the sector of the tire vulcanization metallic mold concerning a 1st embodiment of the present invention. It is a perspective view of a sector of a mold for tire vulcanization concerning a 2nd embodiment of the present invention. FIG. 8 is a sectional view of the sector along line Y8-Y8 in FIG. 7.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

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

The upper plate 3 is fixed to the lower end of the lifting cylinder 7. An elevating rod 8 is arranged at the center of the elevating cylinder 7. An upper platen 4 arranged below the upper plate 3 is fixed to a lower end portion of the lifting rod 8. The lifting cylinder 7 and the lifting rod 8 are respectively moved up and down by a drive mechanism (not shown). A channel 4a through which a heat exchange medium such as oil flows is formed in the upper platen 4, and the temperature can be adjusted by the heat exchange medium.

Like 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 adjusted by the heat exchange medium. The tire vulcanizing mold 2 is adapted to be 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 at the center of the lower platen 5. The bladder unit 9 has an upper clamp 11 and a lower clamp 12 fixed to a vertically movable support shaft 10, and a bladder 13 attached to the upper clamp 11 and the lower clamp 12. 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 peripheral side 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 segment 14 is for fixing a plurality of sectors 30 of the tire vulcanizing mold 2 to be described later by fastening bolts (not shown), respectively, and the plurality of segments 14 arranged annularly along the tire circumferential direction, in the present embodiment. Is composed of seven segments 14.

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

The jacket ring 15 is formed in a hollow cylindrical shape, and its upper end is fixed to the upper plate 3. As a result, the jacket ring 15 moves up and down according to the lifting operation of the lifting cylinder 7. The inner surface of the jacket ring 15 is configured by an inner peripheral side conical surface 15a that is an inclined surface that gradually inclines outward in the tire radial direction as it goes downward.

The inner peripheral side conical surface 15a of the jacket ring 15 is formed so as to correspond to the outer peripheral side conical surface 14a of the segment 14 and is movable along the outer peripheral side conical surface 14a 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 configuration such as a tenon and a dovetail groove.

As a result, when the jacket ring 15 is lowered, the inner peripheral side conical surface 15a presses the outer peripheral side conical surface 14a of the segment 14 so that the segment 14 located on the outer side in the radial direction is annularly connected to the inner side in the radial direction. Be moved. Further, when the jacket ring 15 is raised, the segment 14 located on the radially inner side is moved to the radially outer side.

The upper container plate 16 has an upper slide 18 serving as a support member fixed to the lower surface on the outer peripheral side, and an upper side plate 21 described later 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 moves up and down, the upper platen 4 and the upper container plate 16 as well as the upper side plate 21, the segment 14, and the sector 30 move up and down.

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 described later on 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 vulcanization mold 2 includes a plurality of sectors 30 having a tire molding surface that is annularly arranged along the tire circumferential direction and that molds a tread portion and a shoulder portion of a pneumatic tire, and tire diameters of the plurality of sectors 30. It is provided with a pair of upper and lower side plates 21 arranged on the inner side in the direction and having a tire molding surface for molding the sidewall portion of the pneumatic tire.

Each of the pair of upper and lower side plates 21 is formed in an annular shape. A pair of upper and lower bead rings 23 each having a tire molding surface for molding a bead portion of a 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 is moved up and down according to the lifting operation of the lifting rod 8. The upper side plate 21 is adapted to hold down the bead portion of the green tire GT by the bead ring 23 when it is lowered. One sidewall portion and the bead portion of the pneumatic tire are molded by the tire molding surface of the upper side plate 21 and the tire molding surface of the upper bead ring 23.

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

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

Next, as shown in FIG. 2B, air is supplied into the bladder 13 to inflate the bladder 13, and the outer surface of the bladder 13 holds the inner surface of the green tire GT. As a result, the green tire GT is supported by the lower bead ring 23 and the bladder 13 and is not in contact with the lower side plate 21.

Then, by driving a driving device (not shown), the lifting rod 8 and the lifting cylinder 7 are lowered, and the mold closing operation is started. When the elevating rod 8 and the elevating cylinder 7 are lowered, the upper bead ring 23 is brought into contact with the bead portion located on the upper side of the green tire GT as shown in FIG. 2C, and is shown in FIG. 2D. As described above, after the green tire GT is deformed by the upper bead ring 23, the upper side plate 21 is brought into contact with the green tire GT.

As shown in FIG. 2E, at a predetermined mold closing completion position where the upper side plate 21 comes into contact with the green tire GT to complete the mold closing, the lowering operation of the lifting rod 8 is stopped and the upper side is closed. The lowering of the plate 21 is stopped. When the upper side plate 21 is lowered 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, the lowering cylinder 7 lowers the jacket ring 15 together with the upper plate 3. When the jacket ring 15 is moved downward, the inner peripheral conical surface 15a presses the outer peripheral conical surface 14a of the segment 14 and the sector 30 fixed to the segment 14 is moved radially inward.

As shown in FIG. 2F, the plurality of sectors 30 arranged in the tire circumferential direction are combined with the sectors 30 adjacent to each other in the tire circumferential direction to form the plurality of sectors 30 in an annular shape, and the plurality of sectors 30. When the respective 30 are fitted to the pair of upper and lower side plates 21, the lowering by the elevating 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 is pressed by the bladder 13. A heat exchange medium whose temperature is controlled so that the green tire GT can be vulcanized at a predetermined vulcanization temperature is constantly flowing through the upper platen 4 and the lower platen 5. Thereby, the green tire GT is vulcanized and molded to manufacture a pneumatic tire.

Next, the tire vulcanizing mold according to the present embodiment will be further described.
FIG. 3 is a perspective view of a sector of the tire vulcanizing mold, and FIG. 4 is a sectional view of the sector taken along the line Y4-Y4 in FIG. The plurality of sectors 30 of the tire vulcanizing mold 2 are similarly formed. As shown in FIGS. 3 and 4, in the sector 30, the end surfaces 31 on both sides in the tire circumferential direction extending in the direction orthogonal to the tire circumferential direction are formed as mating surfaces with the adjacent sectors 30 and are adjacent to the sectors 30 when the mold is closed. Abutted and aligned.

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

The tire molding surface 33 of the sector 30 is provided such that the tire width direction center side bulges outward in the tire radial direction compared to the tire width direction outside, and the tire width direction center side and the tire width direction outside are the tread portion and the tire width direction outside, respectively. It is formed to correspond to the shape of the shoulder portion. On the tire molding surface 33 of the sector 30, a plurality of skeletons 33a forming a main groove extending in the tire circumferential direction of the pneumatic tire, and in the present embodiment, four skeletons 33a have a substantially rectangular cross section inward in the tire radial direction. It is provided so as to project.

In the sector 30, a mating surface 34 of the end surface 32 on the inner side in the tire radial direction and the side plate 21 on the outer side in the tire width direction is formed in a substantially arc shape in the tire circumferential direction. In the sector 30, a predetermined area on the tire molding surface side, which is the inner side in the tire width direction of the mating surface 34 with the side plate 21, is configured by the mating surface constituting member 40.

The mating surface constituting 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 constituting member 40 is arranged in the mounting recess 35 formed in the sector 30 so as to correspond to the mating surface constituting member 40.

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

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 the present embodiment, the mating surface forming member 40 is attached to the sector 30 by using three fastening bolts B1, but one or more fastening bolts, preferably two or more fastening bolts are used. It is replaceably attached to the sector 30.

In the sector 30, a female screw is formed in the bolt insertion hole 36, and an enzato 45 formed in a substantially cylindrical shape is attached to the female screw. The enzato 45 has a male screw on the outer circumference and a female screw on the inner circumference, and is made of a material having a hardness higher than that of the sector 30.

The enzato 45 is attached to the bolt insertion hole 36 by being screwed into the female screw of the bolt insertion hole 36. The fastening bolt B1 is screwed into the female screw of the enzato 45, and is screwed into the screw hole 41 through the bolt insertion hole 36 of the sector 30.

Although FIG. 4 shows the mating surface constituting member 40 that is attached to the sector 30 and constitutes the tire molding surface side that is the tire width direction inner side of the mating surface 34 with the upper side plate 21, the lower side plate. The same applies to the mating surface constituting member that constitutes the tire molding surface side that is the tire width direction inner side of the mating surface 34 with 21.

In the tire vulcanization mold 2, the size D1 in the tire radial direction of the mating surface constituting member 40 that is replaceably attached to the sector 30 is set to 15 to 60 mm, and the size H1 in the tire width direction is 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 formed of an aluminum-based material such as an Al-Mg-based aluminum alloy or an Al-Si-Mg-based aluminum alloy, and the elastic coefficient of the sector 30 is set to about 67 to 74 GPa, for example. The mating surface constituting member 40 is made of an iron-based material such as carbon steel for machine structure (SC material), and the elastic coefficient of the mating surface constituting member 40 is set to about 210 GPa, for example. The mating surface forming member 40 is formed of a material having a higher elastic coefficient than the sector 30. Ensert 45 is formed of a material having a hardness higher than that of sector 30 such as stainless steel.

In the present embodiment, the 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 composed of the replaceable mating surface constituting member 40. It is also possible to replaceably attach to at least one sector 30 a mating surface constituting member that constitutes a predetermined region on the tire molding surface side of the mating surface 34 of the sector 30.

As described above, the tire vulcanizing mold 2 according to the present embodiment includes the plurality of sectors 30 that are arranged in a ring shape along the tire circumferential direction and that are movable in the tire radial direction. At least one of the sectors 30 is provided with a mating surface constituting member 40 which is replaceably attached to a predetermined area on the tire molding surface side of the mating surface 34 of the sector 30.

Accordingly, even when wear occurs on the tire molding surface side of the mating surface 34 of at least one sector 30 of the plurality of sectors 30, it is possible to easily replace the mating surface forming member 40 with a new mating surface constituting member 40. It is possible to improve the workability of and to suppress the occurrence of defective molding due to wear of the mating surface 34 of the sector 30.

Further, the mating surface constituting member 40 is made of a material having a higher elastic coefficient than that of the sector 30. Accordingly, as compared with the case where the mating surface constituting 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, so that The replacement frequency of the surface constituting member 40 can be reduced to improve the productivity.

When the sector 30 is made of an aluminum-based material and the mating surface constituting member 40 is made of an iron-based material, the tire molding surface side of the mating surface 34 of the sector 30 is constituted by the mating surface constituting member 40, thereby increasing the weight. It is possible to suppress the deterioration of workability by suppressing

In addition, the tire vulcanizing mold 2 includes the side plates 21 arranged inside the plurality of sectors 30 in the tire radial direction, and the mating surface constituting member 40 is the tire molding surface side of the mating surface 34 with the side plates 21. Make up. As a result, in the sector 30, since the tire molding surface side of the mating surface 34 with the side plate 21 that easily wears is constituted by the mating surface constituting member 40, the workability of mold maintenance is improved and the occurrence of molding defects is suppressed. It can be effectively planned.

Further, the mating surface constituting 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, as compared with the case where the fastening member is attached from the mating surface side, the mating surface of the sector 30 can be formed more accurately, and the green tire GT can be vulcanized and molded with higher accuracy.

In the present embodiment, the mating surface constituting member 40 is made of a material having a higher elastic coefficient than the sector 30, but it may be made of the same material as the sector 30.

In such a case, compared to the case where the mating surface constituting member 40 is not formed of the same material as the sector 30, the dimensional changes due to thermal expansion of the sector 30 and the mating surface constituting member 40 during vulcanization molding can be made equal. Therefore, the green tire GT can be accurately vulcanized and molded.

FIG. 5: is sectional drawing of the modification of the sector of the metal mold|die for tire vulcanization which concerns on 1st Embodiment of this invention. In FIG. 5, a modified example of the sector is shown in a cross section corresponding to the cross section of the sector 30 shown in FIG. As shown in FIG. 5, the mating surface constituting member 50 that is replaceably attached to the sector 30′ is provided on both sides in the tire circumferential direction of the sector 30′, which is the mating surface side with the adjacent sector 30′ where wear easily occurs. It is also possible to form the tire 30 in a larger size in the tire radial direction than in the tire circumferential direction center side. Also in this case, the mounting recess 55 formed in the sector 30 ′ is formed corresponding to the mating surface constituting member 50.

FIG. 6 is a perspective view of another modified example 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 that is replaceably attached to the sector 30″ has a tire circumferential direction of the sector 30″ that is the mating surface side with the adjacent sector 30″ where wear easily occurs. It is also possible to provide only on both sides and not to provide on the center side in the tire circumferential direction.

Also in such a case, the mounting recessed portion 65 formed in the sector 30″ is formed corresponding to the mating surface constituting member 60, and the mating surface constituting member 60 is respectively formed in the bolt insertion holes provided in the sector 30″. It is replaceably attached to the sector 30″ by a fastening bolt that is inserted from the outside in the tire radial direction.

FIG. 7 is a perspective view of a sector of a tire vulcanizing mold according to the second embodiment of the present invention, and FIG. 8 is a sectional view of the sector taken along line Y8-Y8 in FIG. In the sector of the tire vulcanizing mold according to the second embodiment, a mating surface forming member that constitutes a mating surface between the sector of the tire vulcanizing mold according to the first embodiment and an adjacent sector is further attached. Other than that, the description is omitted for the similar configuration.

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

In the sector 70, a predetermined area on the tire molding surface side that is the tire radial direction inner side of the mating surface 31 with the adjacent sector 30 is configured by the mating surface constituting member 80. The mating surface forming member 80 constitutes the tire molding surface side at the tire width direction center side including the bone portion 33a provided on the tire molding surface 33. The mating surface forming member 80 is formed in a substantially rectangular shape in a cross section orthogonal to the tire width direction while extending outside the skeleton 33a in the tire width direction.

The mating surface forming member 80 includes an extending portion 82 that projects and extends in a substantially rectangular shape on the circumferential center side of the sector 70 on the outer side in the radial direction from the tire molding surface 33, and has a substantially L-shaped cross section when viewed in the tire width direction. Has been formed. The mating surface constituting member 80 is arranged in a mounting recess 75 formed in a recess corresponding to the sector 70 corresponding to the mating surface constituting member 80.

As shown in FIG. 8, the sector 70 is provided with a bolt insertion hole 76 into which the fastening bolt B2 as a fastening member is inserted from the outside in the tire radial direction. A bolt accommodating hole 77 for accommodating the head portion of the fastening bolt B2 is provided outside the bolt insertion hole 76 in the tire radial direction. The mating surface constituting member 80 is provided with screw holes 81 corresponding to the bolt insertion holes 76 of the sector 70 on the tire radial outer surface 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 replaceably attached to the sector 70 using one or more fastening bolts, preferably two or more fastening bolts.

Also in the sector 70, a female screw is formed in the bolt insertion hole 76, and an enzaat 85 formed in a substantially cylindrical shape is attached to the female screw. The enzatte 85 has a male screw on the outer circumference and a female screw on the inner circumference, and is made of a material having a hardness higher than that of the sector 70.

The enzato 85 is attached to the bolt insertion hole 76 of the sector 70 by being screwed into the female screw of the bolt insertion hole 76. The fastening bolt B2 is screwed into the female screw of the enzato 85 and is screwed into the screw hole 81 through the bolt insertion hole 76 of the sector 70.

Although FIG. 8 shows the mating surface constituting member 80 which is attached to the sector 70 and constitutes the tire molding surface side of the mating surface 31 with the sector 70 which is adjacent to one side in the tire circumferential direction, the other side in the tire circumferential direction is shown. The mating surface constituting member 80, which constitutes the tire molding surface side of the mating surface with the adjacent sector, has the same structure.

In the tire vulcanization mold 2, the mating surface constituting member 80 that is 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 is set to 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 formed of an aluminum-based material such as an Al-Mg-based aluminum alloy or an Al-Si-Mg-based aluminum alloy, and the elastic coefficient of the sector 70 is set to about 67 to 74 GPa, for example. The mating surface constituting member 80 is formed of an iron-based material such as carbon steel for machine structure (SC material), and the elastic coefficient of the mating surface constituting member 80 is set to about 210 GPa, for example. The mating surface forming member 80 is made of a material having a higher elastic coefficient than the sector 70. Ensert 85 is formed of a material having a hardness higher than that of sector 70 such as stainless steel. The mating surface constituting member 80 may be made of the same material as the sector 70.

In the present 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 the replaceable mating surface constituting member 80. It is also possible to replaceably attach at least one sector 70 a mating surface constituting member that constitutes a predetermined area on the tire molding surface side of the mating surface 31 of the sector 70.

In the present embodiment, a mating surface constituting member 40 constituting the mating surface 34 with the side plate 21 and a mating surface constituting member 80 constituting 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 constitutes the mating surface 31 with the adjacent sector 70.

In the present embodiment, the mating surface forming member 80 that is replaceably attached to the sector 70 and that forms 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 line L1, it is also possible to provide it in the entire tire width direction from the tire width direction center side 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 that are arranged annularly along the tire circumferential direction and are movable in the tire radial direction. To at least one sector 30, 70 of the plurality of sectors 30, 70, mating surface constituting members 40, 80 constituting a predetermined region on the tire molding surface side of the mating surfaces 34, 31 of the sectors 30, 70 are replaceably attached. Has been.

As a result, even when wear occurs on the tire molding surface side of the mating surfaces 34, 31 of at least one sector 30, 70 of the plurality of sectors 30, 70, the mating surface forming members 40, 80 can be easily replaced. Therefore, it is possible to improve the workability of die 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 skeleton portion 33a that forms a main groove extending in the tire circumferential direction on the tire molding surface 33, and the mating surface constituting member 80 defines the skeleton portion 33a on the mating surface 31 with the sector 70 adjacent in the tire circumferential direction. It comprises the tire molding surface side including. Accordingly, in the sector 70, the tire molding surface side including the skeleton 33a in the mating surface 31 with the adjacent sector 70 in which wear is likely to occur is configured by the mating surface constituting member 80, so that the workability of mold maintenance is improved. It is possible to effectively suppress the occurrence of molding defects.

Further, the mating surface constituting member 80 is attached to the sector 70 by using a fastening member B2 inserted from the outside of the sector 70 in the tire radial direction. As a result, the mating surface of the sector 70 can be formed more accurately and the green tire GT can be vulcanized and molded more accurately than when the fastening member is attached from the mating surface side.

In the above-described embodiments, the sectors 30, 70 are configured such that the tire molding surface side of the mating surfaces 34, 31 of the sectors 30, 70 is replaceable by the mating surface constituting members 40, 80, and the mating surfaces 34 of the sectors 30, 70 are Although the side opposite to the tire molding surface of 31 is composed of the sector body portion, the entire mating surfaces 34 and 31 of the sectors 30 and 70 can be replaced by mating surface constituting members.

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

1 Vulcanization Molding Machine 2 Tire Vulcanizing Mold 18 Upper Slide 21 Side Plates 30, 30', 30'', 70 Sector 31 Sector Matching Surface 33 Tire Molding Surface 33a Skeleton 34 Side Plate Matching Surface 40 , 80 Mating surface components B1, B2 Fastening bolt GT Green tire

Claims (6)

A tire vulcanizing mold for vulcanizing and molding a green tire,
Equipped with a plurality of sectors that are arranged annularly along the tire circumferential direction and are configured to be movable in the tire radial direction,
A tire vulcanizing mold, wherein a mating surface constituting 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 of the plurality of sectors. The tire vulcanizing mold according to claim 1, wherein the mating surface forming member is formed of a material having a higher elastic coefficient than that of the sector. The tire vulcanizing mold according to claim 1, wherein the mating surface forming member is formed of the same material as the sector. A side plate arranged on the inner side in the tire radial direction of the sector,
The mold for tire vulcanization according to any one of claims 1 to 3, wherein the mating surface constituting member constitutes a tire molding surface side of a mating surface with the side plate. The sector includes a bone portion that forms a main groove extending in the tire circumferential direction on the tire molding surface,
The tire vulcanization according to any one of claims 1 to 4, wherein the mating surface constituent member constitutes a tire molding surface side including the bone portion in a mating surface with sectors adjacent in the tire circumferential direction. Mold. The tire vulcanizing metal according to any one of claims 1 to 5, wherein the mating surface forming member is attached to the sector by using a fastening member that is inserted from the outside of the sector in the tire radial direction. Type.

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