JP2005225034A - Tire forming machine and tire forming method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tire forming machine capable of preventing the peel or damage of an inner liner in folding the inner liner and a carcass ply, and a tire forming method. <P>SOLUTION: The tire forming machine 1 is equipped with a rigid core 2 having an outer surface shape almost corresponding to the inner surface shape of a product tire and forming the inner liner and the carcass ply to the outer surface of the product tire, a pair of the rings 3 positioned on the inner peripheral side of the rigid core 2 to move from the inside in the width direction of the rigid core 2 to the outside thereof to fold back both end parts of the inner liner and the carcass ply into a cylindrical slape and a take-up means 4 for taking up both end parts of the inner liner and a carcass ply on the outer peripheral sides of the inside surface in the width direction of the rigid core 2 of those rings 3 to form a bead part. A plurality of folding back rollers 5 are provided on the outer peripheral parts of a pair of the rings 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a tire molding apparatus and method, and in particular, provides a technique for improving the moldability of a bead portion of a raw tire.

  In molding a raw tire, for example, as described in Patent Document 1, a rigid core having an outer surface shape substantially corresponding to the inner surface shape of a product tire, an inner liner and a carcass ply on the outer surface, an inner liner rubber and Carcass cord and skim rubber are attached and arranged, and a pair of rings located on the inner peripheral side of the rigid core are moved from the inner side to the outer side in the width direction of the rigid core, so that both end portions of the inner liner and carcass ply Is bent into a cylindrical shape, and a bead portion is formed by winding up both end portions of the inner liner and the carcass ply with a bladder provided on the outer peripheral side on the inner side in the width direction of the ring. (However, the rigid core with the ring and bladder built-in has not been released.)

Details of the green tire molding process will be described below with reference to the drawings.
FIG. 10 shows a tire molding apparatus used for molding this raw tire. In the figure, reference numeral 51 denotes a rigid core having an outer surface shape substantially corresponding to the inner shape of the product tire. A pair of rings 52 are provided on the inner peripheral side of the rigid core 51, and further, the inner side in the width direction of the ring 52 Is provided with a bladder 53.

As shown in FIG. 11 (a), a ribbon-like inner liner rubber is attached to the outer surfaces of the rigid core 51 and the ring 52 of this tire molding apparatus, and the inner liner 54 is molded. Then, the ribbon-like skim rubber and carcass cord are formed. And carcass ply 55 is molded.
Further, stitching is performed by a stitching roller (not shown), ribbon-like skim rubber is pasted, and the skim rubber layer 57 is molded.
Subsequently, the bead filler 58 and the bead core 59 manufactured in separate steps are set.

  Here, as shown in FIGS. 11B and 11C, the ring 52 is moved on the central axis thereof from the inner side to the outer side in the width direction of the rigid core. Thereby, the inner liner 54, the carcass ply 55, and the skim rubber layer 57 are folded back into a cylindrical shape.

  Further, the ring 52 is moved to the position shown in FIG. 11D, and the bladder 53 is filled with the internal pressure to be bulged and deformed. Thereby, as shown in FIG. 12A, both end portions of the inner liner 54, the carcass ply 55 and the skim rubber layer 57 are wound up around the bead core 59. Finally, as shown in FIG. 12B, the presser plate 60 and the ring 52 are moved from the outer side in the width direction of the rigid core 51 toward the inner side, and the bladder 53 is further pressed against both ends of the inner liner 54. The air is removed between the skim rubber layer 57 and the bead core 58 and the bead filler 59 to improve the adhesion, thereby forming a bead portion.

However, the tire molding method and apparatus as described above have the following problems.
First, when both ends of the inner liner 54, the carcass ply 55, and the skim rubber layer 57 are folded back into a cylindrical shape using the ring 52, the outer peripheral surface of the ring 52 is higher in rigidity than the inner liner 54, and the ring 52 Since the outer peripheral surface and the inner liner 54 are slid with a high coefficient of friction, the inner liner 54 may be peeled off from the carcass ply 55 and the surface of the inner liner 54 may be damaged or deformed.

Further, when the both ends of the inner liner 54, the carcass ply 55 and the skim rubber layer 57 are wound up by the bladder 53, the bladder 53 is housed on the inner peripheral side of the rigid core 51. It had to be restricted, and the winding height of the both end portions was also restricted. Further, the bladder 53 has a problem that the hoisting force itself is not large, and further, there is a problem that the life cycle cost becomes high because it easily deteriorates with time.
JP 2003-311741 A

  The present invention has been made to solve such problems of the background art, and its purpose is to prevent the inner liner and the carcass ply from being peeled or scratched when the inner liner and the carcass ply are folded. It is an object of the present invention to provide a tire molding apparatus and a molding method.

The tire molding device according to the present invention has an outer surface shape substantially corresponding to an inner surface shape of a product tire, a rigid core for forming an inner liner and a carcass ply on the outer surface, and an inner peripheral side of the rigid core. A pair of rings that move from the inner side to the outer side in the width direction of the rigid core and fold both end portions of the inner liner and the carcass ply into a cylindrical shape, and the outer peripheral side of the inner side surface in the width direction of the rigid core of the rings, A tire molding apparatus comprising winding means for winding up both end portions of an inner liner and a carcass ply to form a bead portion,
A plurality of folding rollers are provided on the outer periphery of the pair of rings.

  According to this, when the both ends of the inner liner and the carcass ply are folded back into a cylindrical shape by the outer peripheral surface of the ring, the ring is fixed to the rigid core by bringing a plurality of folding rollers provided on the outer peripheral side of the ring into contact with the inner liner. Even if it is moved from the inner side to the outer side in the width direction, the friction between the ring and the inner liner can be almost eliminated, so that the inner liner can be peeled off from the carcass ply, and the inner liner can be damaged or deformed. Can be prevented.

Preferably, as described in claim 2, a plurality of the winding means are mechanical fingers provided on the outer peripheral side of the inner side surface in the width direction of the ring.
According to this, when winding both end portions of the inner liner and the carcass ply, it is possible to eliminate the restriction on the winding heights of the both end portions, which has been a problem with the conventionally used bladder. At the same time, by using mechanical fingers as the hoisting means, the hoisting force itself is increased compared to the bladder, and the durability as the hoisting means is also improved, so that the force for raising the bladder itself is not large. And since it is easy to deteriorate over time, the problem that the life cycle cost becomes high can be eliminated.

Alternatively, the tire molding apparatus according to the present invention has an outer surface shape substantially corresponding to the inner surface shape of the product tire, and a rigid core for forming an inner liner and a carcass ply on the outer surface. And a pair of rings that are located on the inner peripheral side of the rigid core and move from the inner side to the outer side in the width direction of the rigid core so that both end portions of the inner liner and the carcass ply are folded back into a cylindrical shape. A device,
Mechanical fingers that wind up both end portions of the inner liner and the carcass ply to form bead portions may be provided on the outer peripheral side of the inner surface in the width direction of the rigid core of these rings.

  According to this, the effect by using the mechanical finger as the winding means described in claim 2 can be obtained alone. In other words, compared to the bladder, this increases the hoisting force itself and also increases the durability as the hoisting means, and the problem is that the force for raising the bladder itself is not large, and it is easy to deteriorate over time. The problem of high cycle costs can also be eliminated.

According to the tire molding method of the present invention, as described in claim 4, the inner core and the carcass ply are formed on the outer surface of the rigid core having an outer surface shape substantially corresponding to the inner surface shape of the product tire, and the rigid core By moving a pair of rings located on the inner peripheral side from the inner side in the width direction of the rigid core to the outer side, both end portions of the inner liner and the carcass ply are folded back into a cylindrical shape, and the inner liner and the carcass are wound by a winding means. A method of molding a tire that winds up both end portions of a ply to form a bead portion,
The tire molding apparatus according to any one of claims 1 to 3 is used.

  According to this, in the molding of the tire as described above, it is possible to prevent the inner liner from being peeled off from the carcass ply and from being damaged or deformed. Alternatively, when winding both end portions of the inner liner and the carcass ply, it is possible to eliminate the restriction on the winding height of the both end portions, which has been a problem with a conventionally used bladder. At the same time, the problem that the winding force itself of the bladder is not large and the problem that the life cycle cost is high because of easy deterioration over time can be eliminated.

  As is apparent from the above description, according to the tire molding apparatus and molding method of the present invention, it is possible to prevent the inner liner from being peeled off from the carcass ply or from being damaged or deformed. Alternatively, it is possible to eliminate the restriction on the winding height of both end portions of the inner liner and the carcass ply, and the winding force itself is increased by using a mechanical finger as the winding means, thereby preventing deterioration over time and reducing the life cycle cost. It can be prevented from becoming high.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view schematically showing a half part of a tire molding apparatus according to the present invention.
In FIG. 1, reference numeral 1 denotes a tire molding apparatus according to the present invention. The tire molding apparatus 1 has an outer surface shape substantially corresponding to the inner surface shape of the product tire, and is positioned on the inner peripheral side of the rigid core 2 and a rigid core 2 for forming an inner liner and a carcass ply on the outer surface. The pair of rings 3 that move from the inner side to the outer side in the width direction of the rigid core 2 to fold back both end portions of the inner liner and the carcass ply into a cylindrical shape, and the inner side surface of the rigid core 2 in the width direction of the ring 3 The outer peripheral side includes mechanical fingers 4 as winding means for winding up both end portions of the inner liner and the carcass ply to form a bead portion, and a plurality of folding rollers 5 are provided on the outer peripheral portions of the pair of rings 3. .

Here, as shown in the figure, the mechanical finger 4 is provided with an arm 7 pivotably provided on a bracket 6 that protrudes from the inner surface in the width direction of the rigid core of the ring 3. The roller 8 is rotatably provided, and further includes a spring (not shown) that applies a force for rotating the arm 7 clockwise.
Further, a stopper 9 is provided on the inner peripheral side of the mechanical finger 4 so that the arm 7 cannot pivot counterclockwise and downward in the vertical direction from the horizontal direction.

FIG. 2 is a view of the ring and the mechanical fingers of the tire molding apparatus according to the present invention as seen from the inner side in the width direction.
Although it is preferable to provide as many mechanical fingers 4 as possible on the outer peripheral side of the ring 3, in practice, there are restrictions on the number of dimensions. Therefore, specifically, it is preferable to provide 36 to 60 pieces (48 pieces in FIG. 2) as shown in FIG.

Since FIG. 1 shows the right half of the tire molding apparatus, in the case of the left half, which is not shown here, the aforementioned rotational directions are reversed.
Here, the folding roller 5 also serves as a stopper for restricting the pivoting of the arm in the clockwise direction.

Further, the gap α formed between the arm 7 and the folding roller 5 should be made as small as possible in order to prevent the bead core from falling when the ring 3 is moved from the inside to the outside in the width direction of the rigid core. Is preferred.
Further, the maximum distance R1 from the center axis of the ring 3 of the arm 7 is preferably substantially the same as the maximum distance R2 from the center axis of the folding roller. This is to prevent the bead core from falling down when the inner liner and the carcass ply are folded back into a cylindrical shape by moving the ring 3 from the inner side in the width direction toward the outer side as described later.

3 to 5 are schematic views showing details of a tire molding process using the tire molding apparatus according to the present invention.
As shown in FIG. 3, a ribbon-like inner liner rubber is affixed to the outer surfaces of the rigid core 1 and the ring 3 of this tire molding apparatus, and after the inner liner 10 is molded, a ribbon-like skim rubber and a carcass cord are affixed. Then, the carcass ply 11 is molded by performing stitching with a stitching roller (not shown).
Further, a ribbon-like skim rubber is attached to form the skim rubber layer 12.
Subsequently, the bead core 13 and the bead filler 14 manufactured in separate steps are set.

  Here, as shown in FIG. 4A, the ring 3 is moved on the central axis thereof from the inside to the outside in the width direction of the rigid core 2. Thus, the portions of the inner liner 10, the carcass ply 11, and the skim rubber layer 12 that are in contact with the outer surface of the ring 3 are pressed by the ring 3 from the inner side to the outer side in the width direction of the rigid core 2 to form a cylindrical shape. Wrapped.

  At this time, the friction between the ring 3 and the inner liner 10 is extremely reduced by passing the folding roller 5 therebetween. For this reason, it can prevent that the inner liner 10 peels from the carcass ply 11, and the inner liner 10 deform | transforms or is damaged.

  Further, when the ring 3 is moved to the position shown in FIG. 4B, the arm 7 is rotated clockwise (counterclockwise in the left half) as shown in FIG. Accordingly, both end portions of the inner liner 10, the carcass ply 11 and the skim rubber layer 12 are wound around the bead core 13 as shown in FIG. . Thereby, a bead part is formed.

  As shown in FIG. 5B, after forming the bead portion, the arm 7 is flipped up in the vertical direction as illustrated based on the force of the spring. Here, the folding roller 5 serves as a stopper for the arm 7.

FIG. 6 is a schematic perspective view showing an installation mode of a folding roller of the ring.
In FIG. 6, 3 indicates a ring, and 5 indicates a folding roller. As shown in FIG. 6, a plurality of folding rollers 5 are provided on the outer peripheral side of the ring 3.
FIG. 7 is a schematic diagram illustrating an installation mode of the folding roller with respect to the ring.
A comb-like convex portion 15 is provided on the outer peripheral side of the ring 3, and a groove portion 16 is provided in the center portion in the width direction. Further, as shown in the drawing, the wire 17 is inserted through the hubs of the plurality of folding rollers 5, and the wire 17 is fitted into the groove portion 16.

  Although not shown here, two wires 17 are prepared, and the wires 17 are passed through the hubs of the plurality of folding rollers 5 as described above, and at the two binding points on the outer periphery of the ring 3, the wires 17 are respectively connected. Tighten each other and twist them. Accordingly, the folding roller 5 is installed on the outer peripheral side of the ring 3.

FIG. 8 is a schematic view showing an installation mode of the folding roller with respect to the ring as seen from the side of the ring.
As shown in FIG. 8, each folding roller 5 is rotatably supported by the wire 17 in a form that protrudes with respect to the convex portion 16.

FIG. 9 is a cross-sectional view in the radial direction of the ring showing the relative positional relationship between the folding roller and the convex portion.
In FIG. 9, the right side is the outside in the width direction of the rigid core.
As illustrated, the folding roller 5 is provided on the outer peripheral side of the ring 3 by fitting the wire 17 into the groove portion 16 provided in the convex portion 15.

  In addition, the inner peripheral surface 18 of the concave portion formed between the adjacent convex portions 15 of the ring 3 is a slope that rises to the right so that the outer side in the width direction is adjacent to the folding roller 5 as indicated by a dotted line in FIG. It is said. Accordingly, it is possible to prevent a gap from being generated between the roller 5 and the inner peripheral surface 18 of the concave portion on the outer side in the width direction of the ring, and the inner liner and the carcass are formed on the outer surfaces of the rigid core 2 and the ring 3. In molding the ply, it is possible to prevent the supporting force from the inner side in the width direction to the outer side from being reduced due to the generation of a gap on the outer side in the width direction.

  Although not shown here, various types of springs can be employed for the pivoting operation of the arm of the mechanical finger.

  INDUSTRIAL APPLICABILITY The present invention is effective when applied to a pneumatic tire molding apparatus and molding method that can improve the moldability and quality of the bead portion.

It is sectional drawing which represents typically the half part of the molding apparatus of the tire which concerns on this invention. It is the figure which looked at the ring and mechanical finger of the molding apparatus of the tire which concerns on this invention from the width direction inner side. It is a schematic diagram which shows the detail of the molding process of the tire using the molding apparatus of the tire which concerns on this invention. It is a schematic diagram which shows the detail of the molding process of the tire using the molding apparatus of the tire which concerns on this invention. It is a schematic diagram which shows the detail of the molding process of the tire using the molding apparatus of the tire which concerns on this invention. It is a model perspective view which shows the installation aspect of the folding | turning roller of the ring of the tire shaping | molding apparatus which concerns on this invention. It is a schematic diagram which shows the installation aspect with respect to the ring of the folding | turning roller of the tire shaping | molding apparatus which concerns on this invention. It is a schematic diagram which shows the installation aspect with respect to the ring of the folding | turning roller of the tire shaping | molding apparatus which concerns on this invention seeing from the side of a ring. It is sectional drawing of the radial direction of the ring which shows the relative positional relationship of the folding | turning roller and convex part of the tire shaping | molding apparatus which concerns on this invention. It is sectional drawing which represents the half part of the conventional tire shaping | molding apparatus typically. It is a schematic diagram which shows the detail of the molding process of the tire using the conventional tire shaping | molding apparatus. It is a schematic diagram which shows the detail of the molding process of the tire using the conventional tire shaping | molding apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tire molding apparatus 2 Rigid core 3 Ring 4 Mechanical finger 5 Folding roll 6 Bracket 7 Arm 8 Winding roll 9 Stopper α Clearance 10 Inner liner 11 Carcass ply 12 Skim rubber layer 13 Bead core 14 Bead filler 15 Convex part 16 Groove part 17 Wire 18 Concave part Inner peripheral surface

Claims (4)

A rigid core for forming an inner liner and a carcass ply on the outer surface, and an inner surface of the rigid core from the inner side in the width direction. A pair of rings that move outward and fold both end portions of the inner liner and the carcass ply into a cylindrical shape, and both end portions of the inner liner and the carcass ply on the outer peripheral side of the widthwise inner surface of the rigid core of these rings A tire molding apparatus comprising a winding means for forming a bead portion by winding
A tire molding apparatus in which a plurality of folding rollers are provided on the outer periphery of the pair of rings. The tire molding apparatus according to claim 1, wherein a plurality of the winding means are mechanical fingers provided on the outer peripheral side of the inner surface in the width direction of the ring. A rigid core for forming an inner liner and a carcass ply on the outer surface thereof, and an inner surface of the rigid core from the inner side in the width direction. A tire molding apparatus comprising a pair of rings that move outward and fold both ends of the inner liner and carcass ply into a cylindrical shape,
A tire molding apparatus in which mechanical fingers for winding up both end portions of the inner liner and the carcass ply to form bead portions are provided on the outer peripheral side of the inner surface in the width direction of the rigid core of these rings. An inner liner and a carcass ply are formed on the outer surface of the rigid core having an outer surface shape substantially corresponding to the inner shape of the product tire, and a pair of rings positioned on the inner peripheral side of the rigid core are arranged on the inner side in the width direction of the rigid core. The inner liner and the carcass ply are folded at both end portions in a cylindrical shape by moving the inner liner and the carcass ply, and the bead portions are formed by winding up the both end portions of the inner liner and the carcass ply with a winding means. And
A tire molding method using the tire molding apparatus according to claim 1.

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