JP5552996B2 - Pneumatic tire molding method and apparatus - Google Patents

Description

  The present invention relates to a method and an apparatus for molding a pneumatic tire, and more particularly, when a green tire is molded using a molding unit in which a shoulder support cannot be installed, a turned-up member is firmly attached to an opposing member. The present invention relates to a method and apparatus for forming a pneumatic tire that can be crimped.

  In order to manufacture a conventional pneumatic tire, for example, as shown in FIG. 12, a forming drum 20 including a pair of side drums 21 that are installed so that the distance between them can be changed is used. Each side drum 21 is provided with a shoulder support 22 that can be expanded and contracted. When a green tire is molded using the molding drum 20, as shown in FIG. 13, the shoulder support 22 is expanded in diameter to hold the inner peripheral surface of the band member 11. The portion of the band member 11 held by the shoulder support 22 and the both ends in the width direction of the band member 11 turned up by the turn-up bladder 21a and the pressing ring 23 are firmly bonded together. A green tire is formed by bonding a belt member, tread rubber, and the like to the outer peripheral surface of the intermediate green tire formed as described above. Next, the green tire is removed from the molding drum 20, placed in a mold for vulcanization, and vulcanized to produce a pneumatic tire.

  By the way, when manufacturing a pneumatic tire, a green tire is molded using a molding unit, and the molded green tire is placed in the mold for vulcanization while being mounted on the outer peripheral surface of the molding unit. Is known (see, for example, Patent Document 1). As illustrated in FIG. 14, the molding unit 3 includes a cylindrical molding bladder 4, a pair of bladder holding portions 5 attached to both ends of the molding bladder 4, and a variable interval that changes the interval between the bladder holding portions 5. A mechanism 6 is provided. However, such a molding unit 3 is provided with the shoulder support 22 illustrated in FIGS. 12 and 13 that functions to firmly press the opposite ends of the band member 11 in the width direction against the opposing band member 11. There was a problem that I could not.

JP 2007-98803 A

  An object of the present invention is to provide a pneumatic tire molding method and apparatus capable of firmly pressing a turned-up member to an opposing member when molding a green tire using a molding unit in which a shoulder support cannot be installed. There is to do.

  In order to achieve the above object, a method for molding a pneumatic tire according to the present invention includes a cylindrical molded bladder, a pair of bladder holding parts attached to both ends of the molded bladder, and an interval for changing the interval between the bladder holding parts. In a pneumatic tire molding method in which a green tire is molded using a molding unit that is provided in a vulcanization mold with a green tire mounted on an outer peripheral surface, the molded bladder is contracted A band member having a pair of bead members, a pair of side members, and an inner liner and a carcass member disposed between the beads, and then a predetermined outer peripheral side of the carcass member. At least three restriction rings are arranged in parallel in the ring axial direction at a position to inflate the molded bladder, and a pair of bladders With the distance between the holding portions reduced and the amount of swelling of the inner liner and the carcass member regulated by all the regulating rings, both ends of the carcass member are turned up together with the pair of side members, and then both ends in the ring axial direction An intermediate green tire is formed by retracting the restriction ring arranged on the side and performing the turn-up in a state where the bulging amount of the inner liner and the carcass member is restricted only by the remaining restriction ring, and then the remaining The regulating ring is retracted and the belt member is arranged so as to be fitted on the intermediate green tire, and then the molding bladder is inflated, and the belt member is bonded to the outer peripheral surface of the intermediate green tire to form the green tire. It is characterized by doing.

  A pneumatic tire molding apparatus according to the present invention includes a cylindrical molded bladder, a pair of bladder holders attached to both ends of the molded bladder, and a variable interval mechanism for changing the interval between the bladder holders. In a pneumatic tire molding apparatus having a molding unit arranged in a vulcanizing mold with a green tire mounted on the surface, a turn-up mechanism arranged outside the pair of bladder holding portions, and a molding unit A regulating ring movable between an outer retreat position and a predetermined position on the outer peripheral side of the molding bladder, and a pair of bead members and a pair of side members in a molding unit in a state in which the molding bladder is contracted And a band member having an inner liner and a carcass member disposed between the beads, the molding bladder is inflated. In both cases, when the gap between the pair of bladder holding portions is reduced to bulge the inner liner and the carcass member, and the turn-up mechanism turns up both ends of the carcass member together with the pair of side members, the restriction is applied. The ring is moved to a predetermined position on the outer peripheral side of the carcass member, and the bulging amount of the inner liner and the carcass member is restricted, and after the turn-up, the restriction ring is retracted, At least three restriction rings are provided in parallel in the ring axis direction, and each restriction ring can be moved independently.

  In the present invention, when the turn-up is performed, the restriction ring is arranged at a predetermined position on the outer peripheral side of the carcass member constituting the band member, thereby reducing the amount of expansion of the inner liner and the carcass member that are inflated by the molding bladder of the molding unit. It can be regulated as set in advance. As a result, the turned up member can be firmly pressure-bonded to the opposing member.

  Then, at least three of the restriction rings are provided in parallel in the ring axial direction so that each restriction ring can move independently, and all the restriction rings are first placed at predetermined positions on the outer peripheral side of the carcass member. Place the inner liner and the carcass member in a state where the amount of bulging is restricted, and then turn up.Then, the restriction rings arranged at both ends in the ring axial direction are retracted, and the inner liner is formed only by the remaining restriction rings. Then, the turn-up is performed in a state where the bulge amount of the carcass member is regulated to form the intermediate green tire, and then the remaining regulating ring is retracted. Thereby, it becomes easy to crimp a required part accurately as set.

  In the molding apparatus of the present invention, the restriction ring may be formed of a plurality of arc segments, and the arc length of at least one of the segments may be different from the arc length of the other segments. . As a result, the green tire does not have an adverse effect such that the constituent members (mainly carcass members) have a shape approximating a regular polygonal shape due to the segments used when molding. As a result, the manufactured tire is not adversely affected, so that it is possible to prevent a problem that an excessive amplitude occurs at a specific frequency in the tire during traveling.

It is explanatory drawing which illustrates the process of shape | molding a band member. It is explanatory drawing which illustrates the state arrange | positioned so that a band member may be externally fitted to a shaping | molding unit. It is explanatory drawing which illustrates the state which is regulating the bulging amount of a band member with a regulation ring. It is explanatory drawing which illustrates the upper half of the shaping | molding apparatus which is turning up the both ends of a band member. It is explanatory drawing which illustrates the upper half of the shaping | molding apparatus which regulates the amount of swelling of only the center part of the width direction of a band member, and has turned up both ends. It is a side view which illustrates the expansion / contraction mechanism of a control ring. It is a side view which shows the state which illustrates another expansion-contraction mechanism and expands the diameter of a control ring and is retracted. It is a side view which illustrates the state which diameter-reduced the regulation ring of FIG. 7, and has arrange | positioned in the predetermined position. It is explanatory drawing which illustrates the upper half of the shaping | molding apparatus arrange | positioned so that a belt member may be externally fitted to a shaping | molding unit. It is explanatory drawing which illustrates the upper half of the shaping | molding apparatus which has bonded the belt member on the outer peripheral surface of the intermediate | middle green tire. It is explanatory drawing which illustrates the shaping | molding unit of the state which mounted | wore the outer peripheral surface with the green tire. It is explanatory drawing which illustrates the state arrange | positioned so that a band member may be externally fitted to the conventional forming drum. It is explanatory drawing which illustrates the upper half of the shaping | molding drum which is turning up by expanding the diameter of the shoulder support of FIG. It is sectional drawing which illustrates the structure of a shaping | molding unit.

  Hereinafter, a pneumatic tire molding method and molding apparatus of the present invention will be described based on the embodiments shown in the drawings.

  First, as illustrated in FIG. 1, a pair of side members 14 are wound on a band forming drum 19 with a space therebetween, and an inner liner 12 and a carcass member 13 are sequentially stacked between the pair of side members 14. 11 is molded. Next, a pair of bead members 15 are arranged on the outer peripheral side of each side member 14. The bead member 15 is composed of a bead 15 a and a bead filler, and the bead 15 a is temporarily bonded to the band member 11.

  Next, as illustrated in FIG. 2, the band member 11 formed by the pair of side members 14, the inner liner 12 and the carcass member 13 and the pair of bead members 15 are transferred to the molding apparatus of the present invention. The molding apparatus includes a molding drum 1 and a regulation ring 7.

  The molding drum 1 includes a pair of side drums 2 and a molding unit 3 that is detachably attached between the side drums 2. Each side drum 2 is provided with a turn-up mechanism disposed outside the pair of bladder holders 5.

  The molding unit 3 has the structure illustrated in FIG. 14, and changes the interval between the cylindrical molding bladder 4, a pair of bladder holding portions 5 attached to both ends of the molding bladder 4, and the bladder holding portions 5. A variable interval mechanism 6 is provided. The interval between the bladder holders 5 can be fixed at a set length.

  The regulating ring 7 is provided so as to be movable from a retracted position outside the molding unit 3 to a predetermined position on the outer peripheral side of the molding bladder 4. In this embodiment, three regulating rings 7 arranged in parallel in the ring axial direction are provided. Each regulating ring 7 is configured to be able to move independently. The number of restriction rings 7 should just be three or more, for example, three to five restriction rings 7 are provided.

  The band member 11 and the pair of bead members 15 are arranged so as to be externally fitted to the molding unit 3 in a state where the molding bladder 4 is contracted. The bead 15 a is locked by the bead lock mechanism of each side drum 2. The regulating ring 7 is arranged at the center of the molding bladder 4.

  Next, as illustrated in FIG. 3, the regulating ring 7 is disposed at a predetermined position on the outer peripheral side of the band member 11 (the inner liner 12 and the carcass member 13) to expand the molding bladder 4, and one side drum 2 is moved to the other side. It moves so that it may adjoin to the side drum 2 of this, and the space | interval of a pair of bladder holding | maintenance part 5 is made small. As a result, the band member 11 (the inner liner 12 and the carcass member 13) expands to the outer peripheral side, but the bulging amount is regulated by the regulating ring 7. Along with this, the amount of bulging of the molded bladder 4 toward the outer peripheral side is also restricted, so that the bead member 15 is more strongly pressed outward by the molded bladder 4.

  Thus, in a state where the bulging amount to the outer peripheral side of the band member 11 is regulated by all the regulating rings 7, the turn-up bladder 2a is inflated as illustrated in FIG. It is pressed by the pressing ring 10 that moves to. Thereby, both ends of the carcass member 13 are turned up together with the pair of side members 14.

  Next, as illustrated in FIG. 5, the restricting rings 7 on both sides are enlarged and moved away, and further pressed in a state where the amount of bulging to the outer peripheral side of the band member 11 is restricted only by the central restricting ring 7. The ring 10 is moved in the axial direction to press the turn-up bladder 2a. In this way, the intermediate green tire G1 is formed.

  In this embodiment, the turn-up bladder 2a is used as the turn-up mechanism, but the present invention is not limited to this, and a mechanical turn-up mechanism can also be adopted.

  In the present invention, when turning up, the regulating ring 7 can regulate the amount of swelling of the inner liner 12 and the carcass member 13 that are inflated by the molding bladder 4 as set in advance. As a result, the bead member 15 can be more strongly supported from the inside by the molding bladder 4 as compared with the case where the amount of bulging is not restricted, so that the turned up member (carcass member 13) is opposed to the member (carcass member 13). Or the bead member 15).

  Further, in the present invention, the turn-up is performed in a state where the bulging amounts of the inner liner 12 and the carcass member 13 are first regulated by all the regulation rings 7, and then the regulation rings 7 arranged at both ends in the ring axial direction are used. Since the turn-up is performed in a state in which the bulging amount of the inner liner 12 and the carcass member 13 is restricted only by the remaining restriction ring 7, it is advantageous to press the required part more precisely as set. ing.

  The restriction ring 7 is configured to be expandable / contractable by an expansion / contraction mechanism 9 illustrated in FIG. The expansion / contraction mechanism 9 has an annular ring holding portion 8 and a fluid cylinder 9 a fixed to the ring holding portion 8. Four fluid cylinders 9a are fixed at equal intervals in the circumferential direction. An arc segment 7a is fixed to the rod of each fluid cylinder 9a. An annular regulating ring 7 is constituted by the plurality of segments 7a.

  An annular regulating ring 7 is formed by the plurality of segments 7a in which the rods of the respective fluid cylinders 9a move by extending and contracting in diameter. When the restriction ring 7 is moved to the retracted position, the rods contract and move to increase the diameter of each segment 7a.

  Of the plurality of arc-shaped segments 7a, the arc length of at least one segment 7a may be different from the arc length of the other segment 7a. For example, the arc lengths of all the segments 7a are made different from each other. As a result, the intermediate green tire G1 (and thus the green tire G2) to be molded has a shape in which the constituent members (mainly the carcass member 13) approximate to a regular polygon shape due to the segment 7a used when molding. Such adverse effects do not occur. As a result, the manufactured tire is not adversely affected. Therefore, it is possible to prevent a problem that an excessive amplitude is generated in the tire at a specific frequency during traveling, which is advantageous in reducing RFV.

  The number of segments 7a is not particularly limited as long as it is plural. For example, the number is about 3 to 11, preferably 3 or more. By making the number of segments 7a a prime number of 3 or more, it is more advantageous to reduce the RFV of the manufactured tire.

  The expansion / contraction mechanism 9 can also have a structure illustrated in FIGS. In the expansion / contraction mechanism 9, a grooved ring 9b is rotatably attached to the ring holding member 8. Each segment 7a is fixed to the tip end portion of the support shaft 7b, and a slide shaft 7c is erected at the rear end portion of the support shaft 7b. The slide shaft 7c is guided and moved by the guide groove 9c of the grooved ring 9b.

  As illustrated in FIG. 7, when the rod 9 of the fluid cylinder 9a is extended and moved to rotate the grooved ring 9b, each slide shaft 7c is guided by the guide groove 9c, and the segment 7a moves in diameter. As illustrated in FIG. 8, when the rod 9 of the fluid cylinder 9 a is contracted and moved to rotate the grooved ring 9 b, each slide shaft 7 c is guided by the guide groove 9 c, and the segment 7 a is reduced in diameter to be annular. The regulation ring 7 is formed.

  After the intermediate green tire G1 is formed, as shown in FIG. 9, all the regulating rings 7 are retracted to the retracted position, and the belt member 16 is disposed so as to be externally fitted to the intermediate green tire G1. The belt member 16 includes a belt 17 and a tread rubber 18.

  Next, as illustrated in FIG. 10, the molding bladder 4 is further expanded, and the belt member 16 is bonded to the outer peripheral surface of the intermediate green tire G1 to form the green tire G2. The intermediate green tire G1 and the belt member 16 are firmly joined by a stitcher or the like. Note that the green tire G2 is formed using not only the above-described members but also necessary members as appropriate.

  As illustrated in FIG. 11, the molded green tire G <b> 2 is placed in the vulcanization mold together with the molding unit 3 while being mounted on the outer peripheral surface of the expanded molding bladder 4. Thereafter, vulcanization is performed at a predetermined temperature and a predetermined pressure to complete a pneumatic tire.

  In the present invention, while using the molding unit 3 in which the conventional shoulder support 22 cannot be provided, by using the restriction ring 7, the turned up member can be firmly bonded to the opposing member. Therefore, it is possible to prevent problems caused by insufficient pressure bonding of the members, and it is possible to manufacture a pneumatic tire that ensures a predetermined quality.

1 Forming drum 2 Side drum 2a Turn-up bladder (turn-up mechanism)
DESCRIPTION OF SYMBOLS 3 Molding unit 4 Molding bladder 5 Bladder holding part 6 Space variable mechanism 7 Restriction ring 7a Segment 7b Support shaft 7c Slide shaft 8 Ring holding part 9 Expansion / contraction mechanism 9a Fluid cylinder 9b Grooved ring 9c Guide groove 10 Press ring 11 Band member 12 Inner Liner 13 Carcass member 14 Side member 15 Bead member 15 Bead 16 Belt member 17 Belt 18 Tread rubber 19 Band forming drum 20 Conventional forming drum 21 Side drum 21a Turn-up bladder 22 Shoulder support 23 Press ring G1 Intermediate green tire G2 Green tire

Claims (3)

Equipped with a cylindrical molded bladder, a pair of bladder holders attached to both ends of the molded bladder, and a variable interval mechanism for changing the interval between the bladder holders, and for vulcanization with a green tire attached to the outer peripheral surface In a method for forming a pneumatic tire in which a green tire is formed using a forming unit disposed in a mold,
A band unit having a pair of bead members, a pair of side members, and an inner liner and a carcass member disposed between the beads is externally fitted to the molding unit in a state where the molding bladder is contracted, Next, at least three restricting rings are arranged in parallel in the ring axis direction at a predetermined position on the outer peripheral side of the carcass member to expand the molded bladder and reduce the distance between the pair of bladder holding portions so that all the restricting rings are in place. In a state where the amount of bulging of the inner liner and the carcass member is regulated by the ring, both ends of the carcass member are turned up together with the pair of side members, and then the regulating rings arranged at both ends of the ring axial direction are retracted, The turn-up can be performed with the remaining regulating ring only regulating the bulging amount of the inner liner and carcass member. The intermediate green tire is then molded, and then the remaining regulating ring is retracted and disposed so that the belt member is fitted on the intermediate green tire, and then the molded bladder is inflated to obtain the outer peripheral surface of the intermediate green tire. A green tire is formed by pasting the belt member together to form a pneumatic tire. Equipped with a cylindrical molded bladder, a pair of bladder holders attached to both ends of the molded bladder, and a variable interval mechanism for changing the interval between the bladder holders, and for vulcanization with a green tire attached to the outer peripheral surface In a pneumatic tire molding apparatus having a molding unit arranged in a mold,
A turn-up mechanism disposed on the outside of the pair of bladder holding portions; and a regulating ring movable between a retracted position outside the molding unit and a predetermined position on the outer peripheral side of the molding bladder. The molding unit in a contracted state is disposed so as to externally fit a band member having a pair of bead members, a pair of side members, and an inner liner and a carcass member disposed between the beads. When the bladder is inflated, the distance between the pair of bladder holding portions is reduced, the inner liner and the carcass member are bulged, and the turn-up mechanism turns up both ends of the carcass member together with the pair of side members. In addition, by moving the restriction ring to a predetermined position on the outer peripheral side of the carcass member, the inner liner and the car After the turn-up is performed, the restriction ring is retracted, and at least three restriction rings are provided in parallel with the ring axial direction. A pneumatic tire molding apparatus characterized by being able to move independently.   3. The pneumatic tire molding according to claim 2, wherein the restriction ring includes a plurality of arc-shaped segments, and the arc length of at least one of the segments is different from the arc length of the other segments. apparatus.

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