JP6841612B2 - Tire vulcanization molding method - Google Patents

Description

The present invention relates to a tire vulcanization molding method.

A tire vulcanization mold (hereinafter sometimes referred to as a "die") corresponds to a plurality of sectors that correspond to the tread portion of a tire during vulcanization molding, a pair of upper and lower side plates that correspond to sidewall portions, and a bead portion. It is equipped with a pair of upper and lower bead rings. In the open state of the mold before vulcanization molding, there are a plurality of sectors, between the sector and the side plate, and between the side plate and the bead ring. During vulcanization, after the green tire is inserted into the open mold, the space between multiple sectors, between the sector and side plate, and between the side plate and bead ring is narrowed. Finally, the mold is closed by the close contact between them.

Conventionally, when the mold is closed in this way, a part of the green tire is bitten between the sector and the side plate and vulcanized as it is, and rubber protrusions are formed on the tire surface after vulcanization. It sometimes occurred and spoiled the appearance of the tire.

In order to prevent such biting, the mold described in Patent Document 1 has been proposed. In the mold described in Patent Document 1, a movable ring that comes into contact with the sector is provided on the side plate. This movable ring moves inward of the mold when the sector and the side plate are separated, and moves outward of the mold as the sector and the side plate approach each other. Then, when the sector and the side plate are in close contact with each other, the sector, the side plate and the movable ring form a molded surface. This movable ring holds the green tire inward in the mold until the sector and the side plate are in close contact with each other, and prevents a part of the green tire from being caught between the sector and the side plate.

Japanese Unexamined Patent Publication No. 2011-73252

However, in the mold described in Patent Document 1, since the movable ring locally pushes the sidewall portion of the green tire, there is a problem that the tire is easily deformed. There are also expectations for alternative ways to prevent green tires from getting caught between the sector and the side plates.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a tire vulcanization molding method in which a green tire is less likely to be caught between a sector and a side plate when the mold is closed. ..

The tire sulfide molding method of the embodiment includes a plurality of sectors arranged in a circle, a pair of upper and lower side plates provided on the inner diameter side of a circle formed by the plurality of sectors, and an inner diameter side of the side plates. In a tire brewing method in which a green tire is inserted into a mold provided with a pair of upper and lower bead rings, when the sector and the side plate are separated from each other, the green tire is inserted into the mold. Is inserted to position the bead portion of the green tire on the tire equatorial side of the molding position, and the bead portion of the green tire is moved to the molding position at the same time as or after closing the sector and the side plate. When the bead portion of the green tire is moved from the position on the equatorial side of the tire to the molding position by brewing and molding, the bead chuck member provided between the upper and lower bead rings and the bead ring are used. The bead portion of the green tire is moved while being held , the side plate is provided with a plurality of rings arranged in the radial direction thereof, and the bead portion of the green tire is positioned on the tire equatorial side of the molding position in the mold. When the ring is closer to the bead ring, the ring is moved to the tire equatorial side more than the molding position, and the bead portion of the green tire is moved to the molding position to move the plurality of the rings to the molding position. It is characterized in that a molding surface is formed by a plurality of the rings which have been moved to and completed the movement to the molding position.

According to the tire vulcanization molding method of the embodiment, it is possible to prevent a part of the green tire from being caught between the sector and the side plate when the mold is closed.

A partial cross-sectional view of the tire vulcanization molding apparatus 60 in the radial direction. FIG. 3 is a radial cross-sectional view of the tire vulcanization molding die 1 when the bead ring 40 is in the molding position. The radial cross-sectional view of the tire vulcanization molding die 1 when the bead ring 40 is on the equator side of the tire with respect to the molding position. The radial cross-sectional view of the tire vulcanization molding die 1 in an open state when the green tire 2 is inserted and the bladder 67 is expanded. FIG. 3 is a radial cross-sectional view of the tire vulcanization molding die 1 when the plate body 22 has been lowered to the molding position. FIG. 3 is a radial cross-sectional view of the tire vulcanization molding die 1 when the bead chuck member 50 is advanced to the inside of the bladder 67. FIG. 3 is a radial cross-sectional view of the tire vulcanization molding die 1 when the movement of the bead portion 3 to the molding position is completed. FIG. 5 is a radial cross-sectional view of a tire vulcanization molding die 1 in which a bead chuck member 50 is provided on the outside of a bladder 67. FIG. 3 is a sectional view in the radial direction of the side plate 120 of the modified example. FIG. 5 is a cross-sectional view in the radial direction of the side plate 120 of the modified example when the plate member 130 is rotated by an angle within a predetermined range about the rotation shaft 131. The partial sectional view in the radial direction of the tire vulcanization molding apparatus 260 of the modified example. FIG. 5 is a sectional view in the radial direction of the side plate 220 of the modified example. FIG. 3 is a radial cross-sectional view of the side plate 220 of the modified example when the bead ring 40 is on the equator side of the tire from the molding position.

The tire vulcanization molding apparatus 60 of the embodiment will be described with reference to the drawings. The following embodiments are examples, and various changes, substitutions, omissions, etc. can be made to the following embodiments without departing from the gist of the invention.

In the following description, the radial direction coincides with the radial direction of the green tire (unvulcanized tire) inserted in the mold, and also coincides with the left-right direction in the figure. Further, the inner diameter side and the outer diameter side are the inner diameter side and the outer diameter side in the radial direction unless otherwise specified.

FIG. 1 shows the tire vulcanization molding apparatus 60 of the embodiment. The tire vulcanization molding apparatus 60 includes a tire vulcanization molding die 1 (hereinafter, may be referred to as “mold 1”) composed of a plurality of members having a vulcanization molding surface, and a container that holds the mold 1. 70, a heating device that heats the mold 1, a bladder 67 that pressurizes the green tire inserted in the mold 1 from the inside, and a bead chuck member 50 that holds the bead portion of the green tire inserted in the mold 1. And.

The mold 1 has a plurality of sectors 10 arranged in a circle, a pair of upper and lower side plates 20 provided on the inner diameter side of the plurality of sectors 10, and a pair of upper and lower beads provided on the inner diameter side of the side plates 20. A ring 40 is provided. The inner diameter side surface of the plurality of sectors 10 has a molded surface for molding the tread portion of the tire. The lower surface of the upper side plate 20 and the upper surface of the lower side plate 20 have molding surfaces for molding the sidewall portion of the tire. The lower surface of the upper bead ring 40 and the upper surface of the lower bead ring 40 have molding surfaces for molding the bead portion.

The plurality of sectors 10 can be moved in the radial direction. When the mold 1 is open, the plurality of sectors 10 are moved to the outer diameter side, and the adjacent sectors 10 are spaced apart from each other. In the state where the mold 1 is closed, the plurality of sectors 10 are moved to the inner diameter side, and the adjacent sectors 10 are in contact with each other.

The container 70 includes a segment 71 fixed to the outer diameter side of the sector 10, a jacket ring 72 provided on the outer diameter side of the segment 71, an upper container plate 73 holding the upper side plate 20, and a lower side. It includes a lower container plate 74 that holds the side plate 20.

The inner diameter surface of the jacket ring 72 is inclined so that the upper side has a small diameter and the lower side has a large diameter. The jacket ring 72 can be moved up and down by a first elevating device (not shown).

One segment 71 is provided for each sector 10. An upper slide device 76 is provided between the segment 71 and the upper container plate 73, and a lower slide device 77 is provided between the segment 71 and the lower container plate 74, whereby the segment 71 can be moved in the radial direction. It has become. The outer diameter surface of the segment 71 is inclined so that the upper side has a small diameter and the lower side has a large diameter. The outer diameter surface of the segment 71 and the inner diameter surface of the jacket ring 72 have the same inclination angle and are slidable. Due to such a structure, when the jacket ring 72 is lowered, the inner diameter surface of the jacket ring 72 pushes the segment 71 toward the inner diameter side, and the segment 71 and the sector 10 move toward the inner diameter side. On the contrary, when the jacket ring 72 rises, the segment 71 and the sector 10 move to the outer diameter side.

The upper container plate 73 can be moved up and down by a second elevating device (not shown). When the upper container plate 73 moves up and down, the segment 71, the sector 10, the upper side plate 20, and the upper bead ring 40 also move up and down together with the segment 71.

The heating device includes an upper platen 64 provided on the upper container plate 73 and a lower platen 65 provided under the lower container plate 74. The upper platen 64 and the lower platen 65 are heated, for example, by passing a heated fluid through the inside thereof. When the upper platen 64 and the lower platen 65 are heated, the heat is transferred to the mold 1 to heat the green tire inside the mold 1.

The bladder 67 is provided inside the mold 1. The bladder 67 swells inside the green tire during vulcanization molding and pressurizes the green tire from the inside.

The bead chuck member 50 can move forward and backward with respect to the inside of the bladder 67 on both the upper and lower sides of the bladder 67. When the bead chuck member 50 advances into the inside of the bladder 67, the bead chuck member 50 comes into contact with the inner surface of the bladder 67. When the bead chuck member 50 advances into the inside of the bladder 67 with the mold 1 closed, the bead ring 40 and the bead chuck member 50 hold the bead portion of the green tire on both the upper and lower sides. At this time, the bladder 67 is sandwiched between the bead chuck member 50 and the bead portion of the green tire. The bead chuck member 50 can also be moved in the vertical direction.

Next, the structure of the side plate 20 of the embodiment will be described.

As shown in FIG. 2, the side plate 20 has a plate main body 22 and the inside of the mold of the plate main body 22 (that is, a place on the lower surface side of the upper side plate 20 and a place on the upper surface side of the lower side plate 20). The multilayer ring portion 24 provided in the above is provided. The multilayer ring portion 24 is composed of a plurality of rings arranged in the radial direction (which is also the radial direction of the side plate 20). In the present embodiment, the first to fourth rings 26 to 29 are provided in order from the inner diameter side. The first to fourth rings 26 to 29 can move in the vertical direction between the molding position, which is the position at the time of vulcanization molding, and the position inside the mold. When the first to fourth rings 26 to 29 are in the molding position, the inner surface of the mold of the first to fourth rings 26 to 29 forms one molding surface 25. Further, a gap is formed between adjacent rings of the multilayer ring portion 24 (for example, between the first ring 26 and the second ring 27). The air in the mold can pass through the gap between the rings and further out of the mold through a gap (not shown) formed in the plate body 22. When the first to fourth rings 26 to 29 are in the molding position, the size of the gap between the adjacent rings is preferably 0.05 mm or more and 0.15 mm or less.

The inner diameter side surface 26a of the first ring 26 is in close contact with and fixed to the bead ring 40. As a result, the first ring 26 and the bead ring 40 can be moved together.

At a place where two adjacent rings in the multilayer ring portion 24 face each other, the inner diameter side ring is provided with a convex portion protruding toward the outer diameter side, and the outer diameter side ring is provided with a convex portion protruding toward the inner diameter side. Has been done. The convex portion of the ring on the inner diameter side is a convex portion (referred to as a push convex portion) that pushes the ring adjacent to the outer diameter side inward in the mold. The convex portion of the ring on the outer diameter side is a convex portion (referred to as a receiving convex portion) that receives the push convex portion of the ring adjacent to the inner diameter side. The push-convex portion and the receiving convex portion face each other with a gap in the pushing direction, that is, in the vertical direction.

Specifically, first, a push-convex portion 26b protruding toward the outer diameter side is formed at a location on the outer diameter side of the first ring 26 and outside the mold. On the other hand, a receiving convex portion 27a protruding toward the inner diameter side is formed at a position on the inner diameter side of the second ring 27 and inside the mold. The receiving convex portion 27a has an overlap with the pushing convex portion 26b of the first ring 26 in the vertical direction. However, when the first ring 26 and the second ring 27 are in the molding position, there is a vertical gap between the pushing convex portion 26b and the receiving convex portion 27a.

Further, a push-convex portion 27b protruding toward the outer diameter side is formed at a location on the outer diameter side of the second ring 27 and outside the mold. On the other hand, a receiving convex portion 28a protruding toward the inner diameter side is formed at a position on the inner diameter side of the third ring 28 and inside the mold. The receiving convex portion 28a has an overlap with the pushing convex portion 27b of the second ring 27 in the vertical direction. However, when the second ring 27 and the third ring 28 are in the molding position, there is a vertical gap between the pushing convex portion 27b and the receiving convex portion 28a.

Further, a push-convex portion 28b protruding toward the outer diameter side is formed at a location on the outer diameter side of the third ring 28 and outside the mold. On the other hand, a receiving convex portion 29a protruding toward the inner diameter side is formed at a position on the inner diameter side of the fourth ring 29 and inside the mold. The receiving convex portion 29a has an overlap with the pushing convex portion 28b of the third ring 28 in the vertical direction. However, when the third ring 28 and the fourth ring 29 are in the molding position, there is a vertical gap between the pushing convex portion 28b and the receiving convex portion 29a.

The push-convex portion 26b, the receiving convex portion 27a, the pushing convex portion 27b, the receiving convex portion 28a, the pushing convex portion 28b, and the receiving convex portion 29a make one round in the circumferential direction of each ring.

The plate body 22 is provided with a through hole 23. A rod-shaped member 21 can be inserted into the through hole 23. The rod-shaped member 21 inserted into the through hole 23 from the outside of the mold can push the first ring 26.

As described above, the first to fourth rings 26 to 29 move from the molding position toward the inside of the mold (in the vertical direction of FIG. 2, the direction toward the tire equator of the green tire inserted in the mold). It is possible. As shown in FIG. 3, when an insertion device (not shown) inserts the rod-shaped member 21 into the through hole 23 of the plate body 22, the first ring 26 at the molding position is pushed by the rod-shaped member 21 and moves inward of the mold. To start. At this time, the bead ring 40 also moves inward of the mold together with the first ring 26. When the first ring 26 moves by a certain distance, the pushing convex portion 26b of the first ring 26 hits the receiving convex portion 27a of the second ring 27 and starts pushing the second ring 27 inward of the mold. When the second ring 27 moves inward of the mold by a certain distance, the pushing convex portion 27b of the second ring 27 hits the receiving convex portion 28a of the third ring 28 and starts pushing the third ring 28 inward of the mold. When the third ring 28 moves inward of the mold by a certain distance, the pushing convex portion 28b of the third ring 28 hits the receiving convex portion 29a of the fourth ring 29 and starts pushing the fourth ring 29 inward of the mold. In this way, the first to fourth rings 26 to 29 can move inward of the mold in conjunction with the movement of the bead ring 40 inward of the mold. As shown in FIG. 3, a ring closer to the bead ring 40, that is, a ring on the inner diameter side, moves more inward of the mold than the molding position. When the ring closer to the bead ring 40 is moved to the inside of the mold, a step is formed between the rings, and the first to fourth rings 26 to 29 are arranged in a staircase pattern. The first to fourth rings 26 to 29 and the bead ring 40 are pushed outward from the mold to return to the molding position.

The upper side plate 20 and the lower side plate 20 have the same structure.

Next, a tire vulcanization molding method and a tire manufacturing method using the mold 1 will be described.

In the manufacture of pneumatic tires, first, a belt layer, tread rubber, sidewall rubber and the like are attached to a carcass ply to manufacture a green tire 2.

Next, the first elevating device operates to raise the jacket ring 72, and the second elevating device operates to further operate the upper container plate 73, the segment 71, the sector 10, the upper side plate 20, and the upper bead ring. 40 rises and mold 1 opens. Further, the rod-shaped member 21 is inserted into the through hole 23 of the plate body 22 of the side plates 20 on both the upper and lower sides, and the first to fourth rings 26 to 29 and the bead ring 40 move inward of the mold. At this time, the closer the ring is to the bead ring 40, the larger it moves inward of the mold, a step is formed between the rings, and the first to fourth rings 26 to 29 are lined up in a staircase pattern. Further, heating of the upper platen 64 and the lower platen 65 begins.

Next, the green tire 2 is inserted inside the mold 1. At this time, the lower bead portion 3 of the green tire 2 is placed on the lower bead ring 40. Next, as shown in FIG. 4, the bladder 67 expands and the green tire 2 is held from the inside by the bladder 67. At this time, the bladder 67 does not expand to the maximum size, but expands slightly so that the distance between the upper and lower bead portions 3 of the green tire 2 is held narrower than that at the time of vulcanization molding. In this way, the upper and lower bead portions 3 of the green tire 2 are held closer to the tire equator E side than the molding position.

Next, the second elevating device operates and the upper container plate 73 descends to the molding position. Along with this, the segment 71, the sector 10, the upper side plate 20, and the upper bead ring 40 also descend. During this descent, the upper bead ring 40 and the upper bead portion 3 of the green tire 2 come into contact with each other.

When the upper container plate 73 completes the descent to the molding position and the plate body 22 completes the descent to the molding position as shown in FIG. 5, the bead rings 40 and the bead portions of the green tire 2 are formed on both the upper and lower sides of the mold 1. 3 is in contact with each other, and the first to fourth rings 26 to 29 of the side plate 20 are in contact with the sidewall portion 4 of the green tire 2. At this time, since the first to fourth rings 26 to 29 are in a state of being moved to the tire equator E side (inside the mold) from the molding position and are arranged in a staircase pattern, the sidewall portion of the green tire 2 Reference numeral 4 denotes a corner portion 32 of the stairs formed by the first to fourth rings 26 to 29. At this time, the green tire 2 is held in a state where the upper and lower bead portions 3 and the upper and lower sidewall portions 4 are located on the tire equator E side of the molding position. Also at this time, the sector 10 is still open and away from the side plate 20.

Next, as shown in FIG. 6, the bead chuck member 50 advances to the inside of the bladder 67, and the bead chuck member 50 and the bead ring 40 sandwich and hold the bead portion 3 of the green tire 2. A bladder 67 is sandwiched between the bead chuck member 50 and the bead portion 3 of the green tire 2.

Next, the first elevating device operates and the jacket ring 72 starts descending. When the jacket ring 72 begins to descend, the segment 71 and the sector 10 begin to move toward the inner diameter side.

Further, the rod-shaped member 21 is pulled out from the through hole 23 of the plate body 22 of the side plate 20, the bead chuck member 50 starts to move away from the tire equator E, and the bladder 67 starts to expand further. As a result, the bead ring 40 and the bead portion 3 of the green tire 2 start moving toward the molding position, and the first to fourth rings 26 to 29 start moving toward the molding position in conjunction with the movement.

While the first to fourth rings 26 to 29 are moving toward the molding position, the sidewall portion 4 of the green tire 2 comes into contact with the corner portion 32 of the stairs formed by the first to fourth rings 26 to 29. ing. As the first to fourth rings 26 to 29 move toward the molding position, the space between the side plate 20 and the sidewall portion 4 gradually narrows. As the space between the side plate 20 and the sidewall portion 4 becomes narrower, the air between the side plate 20 and the sidewall portion 4 is discharged to the outside of the mold 1 through the gap between the rings.

Then, when the sector 10 and the side plate 20 come into contact with each other and close at the same time or after closing, the movement of the bead ring 40 and the first to fourth rings 26 to 29 to the molding positions is completed, as shown in FIG. The movement of the bead portion 3 and the sidewall portion 4 of the green tire 2 to the molding position is completed. When the movement of the first to fourth rings 26 to 29 to the molding position is completed, the first to fourth rings 26 to 29 form one molding surface 25, and the green tire 2 is formed on the molding surface 25. The sidewall portion 4 is in contact. When the movement of the first to fourth rings 26 to 29 to the molding position is completed or before that, the discharge of the air between the side plate 20 and the sidewall portion 4 to the outside of the mold is completed.

After the mold 1 is closed in this way, the green tire 2 is held in the closed mold for a predetermined time, and the green tire 2 is heated and pressurized. During this predetermined time during vulcanization molding, the bead portion 3 may be held by the bead chuck member 50 and the bead ring 40. When the predetermined time elapses, the mold 1 opens and the pneumatic tire after vulcanization molding is taken out.

According to the above tire vulcanization molding method, while the sector 10 and the side plate 20 are separated, the bead portion 3 of the green tire 2 is arranged on the tire equator E side of the molding position, so that the green tire 2 is separated from the gap between the sector 10 and the side plate 20 toward the tire equator E side. Then, the bead portion 3 moves to the molding position at the same time when the sector 10 and the side plate 20 are closed (closely adhered) or after the closing, so that the green tire 2 is moved at the same time as or after the sector 10 and the side plate 20 are closed. Adheres so as to straddle both the sector 10 and the side plate 20. Therefore, the green tire 2 is unlikely to be caught between the sector 10 and the side plate 20.

Further, after the green tire 2 is inserted into the mold, the bead portion 3 of the green tire 2 is held by the bead chuck member 50 and the bead ring 40, and the position on the tire equator E side while being held. Is moved to the molding position. Therefore, the bead portion 3 of the green tire 2 is arranged at an appropriate position in the mold and vulcanized, which in turn improves the uniformity of the pneumatic tire.

Further, since the side plate 20 includes the first to fourth rings 26 to 29, when the sidewall portion 4 of the green tire 2 moves to the molding position, the air between the green tire 2 and the side plate 20 is removed. It is discharged from the gap between adjacent rings. Therefore, it is difficult for air to remain in the mold, and a bear (a part of the tire surface defect caused by air remaining inside the mold) occurs on the sidewall of the pneumatic tire after vulcanization molding. Hateful.

Here, since the first to fourth rings 26 to 29 can move more toward the tire equator E side as the ring closer to the bead ring 40, the first to fourth rings 26 to 29 are inside the mold from the molding position. The first to fourth rings 26 to 29 are arranged in a staircase pattern. Therefore, while the first to fourth rings 26 to 29 move from the position on the tire equator E side to the molding position, the green tire 2 in the mold is the corner of the stairs formed by the first to fourth rings 26 to 29. It hits 32 and does not hit the vicinity of the gap between the rings. Therefore, it is unlikely that the green tire 2 closes the gap between the rings and the air remains in the mold before the air between the green tire 2 and the side plate 20 is completely discharged, and vulcanization Bears are less likely to occur on the sidewalls of pneumatic tires after molding.

Further, if the gap between the adjacent rings of the side plate 20 is 0.05 mm or more and 0.15 mm, the air in the mold is sufficiently discharged from this gap, and a large amount of rubber of the green tire penetrates into the gap. There is nothing to do.

Further, since the first ring 26 is fixed to the bead ring 40, there is no possibility that the green tire 2 is caught between the first ring 26 and the bead ring 40.

Next, a modified example of the above embodiment will be described.

First, as shown in FIG. 8, the bead chuck member 150 may be provided on the outside of the bladder 67. In that case, when the bead chuck member 150 and the bead ring 40 hold the bead portion 3 of the green tire 2, the bladder 67 is not sandwiched between the bead chuck member 150 and the bead portion 3 of the green tire 2. The bead chuck member 150 comes into contact with the bead portion 3 of the green tire 2.

Further, the method of moving the ring and the bead ring 40 of the multilayer ring portion of the side plate is not limited to the method of the above embodiment.

The side plate 120 of the modified example is shown in FIGS. 9 and 10. The side plate 120 of the modified example includes a plate main body 122 provided with a through hole 123 and a multilayer ring portion 124, as in the above embodiment. The multilayer ring portion 124 includes first to fourth rings 126 to 129 arranged in the radial direction. From the inner diameter side, the first ring 126, the second ring 127, the third ring 128, and the fourth ring 129 are arranged in this order. The first ring 126 is fixed to the bead ring 40. Further, unlike the above embodiment, one plate-shaped plate member 130 is provided between the plate main body 122 and the first to fourth rings 126 to 129. The plate member 130 is in contact with the first to fourth rings 126 to 129. The plate member 130 has a rotating shaft 131 on the outer diameter side far from the bead ring 40. As shown in FIG. 10, when the rod-shaped member 21 inserted into the through hole 123 pushes the plate member 130, the plate member 130 is displaced so as to rotate by an angle within a predetermined range with the rotation shaft 131 as a fulcrum. The plate member 130 is displaced more so as to be closer to the bead ring 40. When the plate member 130 is displaced, the first to fourth rings 126 to 129 are pushed by the plate member 130 and move inward of the mold. Since the displacement amount of the plate member 130 is larger as the portion closer to the bead ring 40, the ring closer to the bead ring 40 moves more in the multilayer ring portion 124. The plate members 130 are provided at at least three locations in the circumferential direction of the side plate 120. The inner diameter side surface 126a of the first ring 126 is closely fixed to the bead ring 40.

Since the side plate 120 has the above structure, the ring closer to the bead ring 40 can be moved more toward the equator of the tire by displacing the plate member 130. Further, by moving the bead portion of the green tire to the molding position, the first to fourth rings 126 to 129 can be moved to the molding position in conjunction with the bead portion.

Further, the side plate used in the tire vulcanization molding method does not have to have a multi-layer ring portion as in the above embodiment, and may be a side plate 220 in which the molding surface is not divided. FIG. 11 shows the entire tire vulcanization molding apparatus 260 having the side plate 220 whose molding surface is not divided, and FIG. 12 shows the side plate 220 and the bead ring 40 whose molding surface is not divided. When the side plate 220 whose molding surface is not divided is used, the bead ring 40 is provided so as to be separated from the side plate 220 and moved as shown in FIG. Then, by moving the bead ring 40 and the bead chuck member 50 while holding the bead portion 3 of the green tire 2, the bead of the green tire 2 is moved in the mold in which the sector 10 and the side plate 220 are separated from each other. The portion 3 is positioned closer to the equator of the tire than the molding position, and the bead portion 3 of the green tire 2 is moved to the molding position at the same time as or after closing the sector 10 and the side plate 220.

E ... Tire equator, 1 ... Tire vulcanization molding mold (mold), 2 ... Green tire, 3 ... Bead part, 4 ... Side wall part, 10 ... Sector, 20 ... Side plate, 21 ... Rod-shaped member, 22 ... Plate body, 23 ... through hole, 24 ... multi-layer ring part, 25 ... molded surface, 26 ... first ring, 26a ... surface, 26b ... push convex part, 27 ... second ring, 27a ... receiving convex part, 27b ... push Convex part, 28 ... 3rd ring, 28a ... receiving convex part, 28b ... pushing convex part, 29 ... 4th ring, 29a ... receiving convex part, 32 ... corner part, 40 ... bead ring, 50 ... bead chuck member, 60 ... Tire vulcanization molding equipment, 64 ... Upper platen, 65 ... Lower platen, 67 ... Bladder, 70 ... Container, 71 ... Segment, 72 ... Jacket ring, 73 ... Upper container plate, 74 ... Lower container plate, 76 ... Upper side Slide device, 77 ... Lower slide device, 120 ... Side plate, 122 ... Plate body, 123 ... Through hole, 124 ... Multilayer ring part, 126 ... First ring, 126a ... Surface, 127 ... Second ring, 128 ... No. 3 ring, 129 ... 4th ring, 130 ... plate member, 131 ... rotating shaft, 150 ... bead chuck member, 220 ... side plate, 260 ... tire vulcanization molding device

Claims (2)

A plurality of sectors arranged in a circle, a pair of upper and lower side plates provided on the inner diameter side of a circle formed by the plurality of sectors, and a pair of upper and lower bead rings provided on the inner diameter side of the side plates. In the tire vulcanization molding method performed by inserting a green tire into the provided mold,
When the sector and the side plate are separated, the green tire is inserted into the mold, and the bead portion of the green tire is positioned on the tire equator side of the molding position.
Simultaneously with or after closing the sector and the side plate, the bead portion of the green tire is moved to the molding position to perform vulcanization molding.
When the bead portion of the green tire is moved from the position on the equator side of the tire to the molding position, the bead portion of the green tire is held by the bead chuck member provided between the upper and lower bead rings and the bead ring. Move with
The side plate is provided with a plurality of rings arranged in the radial direction thereof.
When the bead portion of the green tire is located closer to the tire equator side than the molding position in the mold, the ring closer to the bead ring is moved to the tire equator side more than the molding position.
In conjunction with moving the bead portion of the green tire to the molding position, the plurality of rings are moved to the molding position.
To form a molding surface with a plurality of said rings completing the movement to the molding position, the tire vulcanization how. A gap of 0.05 mm or more and 0.15 mm or less is provided between the adjacent rings, and when a plurality of the rings are moved from the tire equator side to the molding position, the air in the mold is discharged from the gap.
The tire vulcanization molding method according to claim 1.

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