JP6163036B2 - Method and apparatus for manufacturing bead member - Google Patents

Description

  The present invention relates to a method and an apparatus for manufacturing a bead member.

  The tire has an annular bead core and a bead filler fixed to the bead core in the bead portion. In manufacturing a tire, a bead member may be manufactured in advance by attaching a bead filler to a bead core. When a belt-shaped bead filler is attached to the bead core, there is a difference in the peripheral length between the inner peripheral side and the outer peripheral side of the bead filler. There is a risk of gaps or poor bonding on the side. Therefore, each of the front end portion and the rear end portion in the longitudinal direction of the belt-shaped bead filler is cut obliquely with respect to the longitudinal direction, and the length of the outer peripheral side end is longer than the inner peripheral side end length. It was a long bead filler. However, since the angle at which the front end portion of the bead filler is cut differs from the angle at which the rear end portion is cut, the number of steps increases, and the rubber of the cut bead filler is wasted.

  With respect to the manufacturing method and the manufacturing apparatus of the bead member, the bead filler is attached to the outer peripheral surface of the tapered drum formed in a truncated cone shape, and the front end and the rear end in the longitudinal direction of the bead filler are joined to make an endless shape. There exists what adhere | attaches the thick side base part of this bead filler to a bead core (patent document 1). In the method and apparatus described in Patent Document 1, the bead filler is wound while the distal end in the longitudinal direction is fixed to the surface of the taper drum, and the thin end of the bead filler is stretched more than the thick base. In this state, since the endless joining is performed, no gap or the like is generated in the joining portion between the front end portion and the rear end portion in the longitudinal direction of the bead filler.

JP-A-2-62232

  However, in the method and apparatus of Patent Document 1, it is difficult to adjust the brazing angle of the bead filler described later, and it is particularly difficult to obtain a bead member having a brazing angle exceeding 70 °.

  The present invention advantageously solves the above-described problems, and an object of the present invention is to provide a method and an apparatus for manufacturing a bead member that can flexibly adjust the brazing angle of the bead filler.

The method for producing a bead member of the present invention has a bead filler height of 50 mm or more, a longitudinal tip portion and a rear end portion of the belt-shaped bead filler are cut in the thickness direction, the rotation axis is in the vertical direction, and the upper surface The bead core is concentrically attached to the upper surface of the truncated cone-shaped rotary table having a diameter smaller than that of the lower surface and the inclined surface has an angle of 20 to 30 ° with respect to the horizontal plane, and is rotated by being attached to the rotary table. Adjacent to the bead core, a belt-like bead filler is continuously supplied and pasted on the inclined surface of the rotary table, and the front end and the rear end in the longitudinal direction of the bead filler are butted and joined. To do.
The method for manufacturing a bead member of the present invention having such a configuration flexibly adjusts the brazing angle of the bead filler by sticking the bead filler to the bead core using a frustoconical rotary table having a vertical rotation axis. .

The bead member manufacturing apparatus according to the present invention has a bead filler height of 50 mm or more, and a bead filler cutting device that cuts the longitudinal tip and rear ends of the belt-like bead filler in the thickness direction, and a bead core is attached. A rotary table having a truncated cone shape in which the rotation axis is vertical and the diameter of the upper surface is smaller than the diameter of the lower surface, and the inclined surface has an angle of 20 to 30 ° with respect to the horizontal plane, and the length of the bead filler after pasting And a joining device that joins the front end and the rear end against each other.
The bead member manufacturing apparatus of the present invention having such a configuration can flexibly adjust the brazing angle of the bead filler with a truncated cone-shaped rotary table whose rotation axis is vertical and whose upper surface diameter is smaller than the lower surface diameter. To.

  According to the present invention, since the rotation axis is in the vertical direction and the frustoconical rotary table is used, the front end portion and the rear end portion in the longitudinal direction of the bead filler are abutted and joined, so that the brazing angle of the bead filler can be increased. It can be adjusted flexibly.

It is a conceptual diagram of the manufacturing apparatus of the bead member of one Embodiment of this invention. It is a typical perspective view of a rotary table. It is a typical perspective view of a turntable and a bead filler joining apparatus. It is typical sectional drawing of a bead member. It is a typical side view of the longitudinal direction front-end | tip part and rear-end part of the bead filler of embodiment of this invention. It is a typical side view of the longitudinal direction front-end | tip part and rear-end part of the bead filler of a comparative example.

Hereinafter, embodiments of the present invention will be described more specifically with reference to the drawings.
As shown in the conceptual diagram of FIG. 1, a bead member manufacturing apparatus 1 according to an embodiment of the present invention includes a sticking device 10 that sticks a bead filler to a bead core, and a bead core supply device 20 that supplies the bead core to the sticking device 10. The bead filler supply device 30 for supplying the bead filler to the sticking device 10 is provided.

  The sticking device 10 has a rotary table 11. As schematically shown in FIG. 2, the rotary table 11 has a truncated cone shape in which the rotation axis is in the vertical direction and the diameter of the upper surface is smaller than the diameter of the lower surface. A bead core C supplied from the bead core supply device 20 is detachably attached to the upper surface of the turntable 11 in a concentric manner. A belt-like bead filler F supplied from the bead filler supply device 30 is guided and wound along the slope of the turntable 11. A pressure roller 12 is provided on the rotary table 11 in close proximity. The press roller 12 presses the bead filler F on the rotary table 11 to the bead core C.

  In addition to the turntable 11 and the pressure roller 12, the sticking device 10 includes a drive device 13 for the turntable 11, a bead filler guide device 14, a bead filler cutting device 15, and a bead filler joining device 16. The bead filler joining device 16 is a device that butt-joins and joins the bead filler in an endless manner (butt joint), and as an example, as shown in FIG. 3, each of the front end portion and the rear end portion in the longitudinal direction of the bead filler F is gripping means. 161, and butt-joining each other toward each other.

  The bead core supply device 20 may be configured to store the bead core C manufactured by one or a plurality of wires and sequentially supply the bead core C to the pasting device 10.

  The bead filler supply device 30 has an extruder 31 for extruding unvulcanized rubber and a substantially triangular opening corresponding to the cross-sectional shape of the bead filler C to be manufactured, and a base 32 attached to the tip of the extruder 31. It can be set as the structure containing.

  A method for manufacturing a bead member using the bead member manufacturing apparatus 1 of the present embodiment shown in FIGS. The bead core C supplied from the bead core supply device 20 is concentrically attached to the upper surface of the turntable 11 of the sticking device 10. Further, the belt-like bead filler F formed in a predetermined cross-sectional shape by the die 32 from the extruder 31 of the bead filler supply device 30 is guided onto the rotary table 11 by the bead filler guide device 14 of the sticking device 10. At this time, the bead filler guide device 14 guides the bead filler F so that the thick base portion is adjacent to the bead core C and the bead filler F is positioned on the slope of the turntable 11. The rotary table 11 is rotated by the driving device 13, and the bead filler F continuously supplied according to the rotation is wound around the rotary table 11. Further, the bead filler F is pressure-bonded to the bead core C by the pressure roller 12. In this way, the bead filler F is attached to the bead core C. The bead filler cutting device 15 cuts the bead filler F in the thickness direction of the bead filler F to a length corresponding to the length of one round of the bead core C. The front end portion and the rear end portion of the cut bead filler F in the longitudinal direction are each gripped by the gripping means 161 of the bead filler joining device 16 and are brought together and butt-joined. The bead member obtained by attaching the bead filler F to the bead core C and joining the front end and the rear end in the longitudinal direction of the bead filler F is removed from the turntable 11. This bead member is used for a tire assembling apparatus.

  The bead member manufacturing method and apparatus of the present embodiment uses a truncated cone-shaped rotary table 11 having a vertical rotation axis and an upper surface diameter smaller than a lower surface diameter. The rotary table 11 whose rotation axis is in the vertical direction can easily guide the bead filler F onto the rotary table 11 and has a good pasting efficiency. Moreover, since the turntable 11 has a truncated cone shape, the bead filler F has a shape according to the slope of the turntable 11. Therefore, it is possible to obtain a bead member having a desired shape and having a desired brazing angle.

  As shown in the schematic cross-sectional view of the bead member in FIG. 4, the brazing angle of the bead member is adjusted with respect to the rotation direction of the thick base portion of the bead filler F in contact with the bead core C in the bead member m. This is the angle θ2 formed by the thin-walled end portion. This brazing angle θ2 is not the same as the angle of the portion of the bead filler in the molded and vulcanized tire. The brazing angle θ2 of the bead member is determined by a molding machine that molds a tire. The brazing angle θ2 is normally about 30 to 70 °, but 90 ° may be required depending on the molding machine. Such a brazing angle θ2 exceeding 70 ° and not more than 90 ° can be realized by using the truncated cone-shaped rotary table 11 as in the manufacturing method and manufacturing apparatus of the bead member of the present embodiment. In particular, when the angle θ1 (shown in FIG. 2) formed by the horizontal plane and the inclined surface of the rotary cable 11 is 20 to 30 °, the brazing angle θ2 of the bead member is flexibly realized in the range of 30 to 90 °. As a result, it can contribute to product defect countermeasures.

  Further, by preparing a plurality of rotary tables having different angles θ1 formed by the horizontal plane and the inclined surface of the rotary table 11, bead members having various brazing angles θ2 can be manufactured.

  The manufacturing method and the manufacturing apparatus of the bead member of the present embodiment are brought into contact with the front end portion and the rear end portion in the longitudinal direction of the bead filler F so as to be joined. Therefore, the bead filler F is cut in the thickness direction of the bead filler F by the bead filler cutting device 15. As shown in the schematic side view of the front end portion and the rear end portion of the bead filler F in the middle of guiding in FIG. 5, the bead filler cutting device 15 is arranged in the thickness direction of the bead filler F (the thickness is shown in the drawing). And the front end portion and the rear end portion are cut in a direction orthogonal to the longitudinal direction of the bead filler. Cutting in a direction perpendicular to the longitudinal direction of the bead filler can reduce man-hours compared to the case of cutting obliquely with respect to the longitudinal direction as in the conventional method, and also wastes the rubber of the bead filler. Has the effect of not occurring.

  Further, cutting the bead filler F in the thickness direction of the bead filler F is advantageous for butt-joining the front end portion and the rear end portion of the bead filler F in the longitudinal direction. That is, it has been considered that the bead member is manufactured by using the rotary table 11 in the past. In this case, FIG. 6 is a schematic side view of the front end portion and the rear end portion of the bead filler F. As shown, the longitudinal end and the rear end of the bead filler F bead filler F were cut obliquely with respect to the thickness direction. And both the cut surfaces of the front-end | tip part and a rear-end part were piled up and joined. In such overlap bonding, the thickness increases at the bonded portion, and the bonded portion becomes, for example, 1.5 times as thick as the bead filler thickness t. As a result of the increase in the thickness of the joint portion as described above, the thickness is supposed to vary in the circumferential direction of the bead filler. On the other hand, in this embodiment, the bead filler F is cut in the thickness direction of the bead filler F as shown in FIG. The thickness is almost the same as the thickness of the bead filler F (1.0 to 1.1 times the thickness), and the thickness can be made constant in the circumferential direction of the bead filler, thereby contributing to the improvement of tire performance. can do.

  When the front end portion and the rear end portion in the longitudinal direction of the bead filler F are brought into contact with each other and joined, it is preferable that the front end portion and the rear end portion are gathered toward each other and joined. In the method and apparatus described in Patent Document 1, the front end portion of the bead filler in the longitudinal direction is pressed and fixed to the taper drum, and only the rear end portion of the bead filler is moved toward the front end portion of the bead filler in the longitudinal direction. It had been. In such a joining method in which only the rear end portion of the bead filler is brought close, the deformation amount of the rear end portion is large, and it may be difficult to join with high accuracy. In particular, when joining the front end and rear end in the longitudinal direction of a large bead filler with a bead filler height of 50 mm or more, or when the temperature of the bead filler is room temperature, for example, about 20 ° C., and the rubber is a material that is difficult to deform. It was difficult to join. On the other hand, according to the present embodiment, the longitudinal end portion and the rear end portion of the bead filler F are gripped, gathered together, butted, butted, joined, and joined, whereby the longitudinal end portion of the bead filler F and Since the rear end portions are deformed and brought into contact with each other, the deformation amounts of the front end portion and the rear end portion are relatively small, and therefore the front end portion and the rear end portion in the longitudinal direction of the bead filler F can be joined with high accuracy. Especially, even when it is a large bead filler having a bead filler height of 50 mm or more, or even when it is a low-temperature bead filler, the tip and the rear end can be easily joined with high accuracy. The effect is great.

  The method and apparatus for manufacturing the bead member of the present embodiment described above are not limited to the drawings and the description of the embodiment, and various modifications are possible. For example, it is not limited to a configuration in which each of the front end portion and the rear end portion in the longitudinal direction of the bead filler F is gripped and brought toward each other. .

DESCRIPTION OF SYMBOLS 1: Manufacturing apparatus of bead member, 10: Pasting apparatus, 11: Rotary table, 12: Press roller, 13: Drive apparatus, 14: Bead filler guide apparatus, 15: Bead filler cutting apparatus, 16: Bead filler joining apparatus, 20 : Bead core supply device, 30: Bead filler supply device, 31: Extruder, 32: Base

Claims (3)

The bead filler height is 50 mm or more, the longitudinal direction front end portion and the rear end portion of the belt-shaped bead filler are cut in the thickness direction,
Diameter of the upper surface rotary shaft is a vertical direction rather smaller than the diameter of the lower surface, slope, the upper surface of the turntable frustoconical with an angle of 20 to 30 ° with respect to the horizontal plane, fitted with a bead core concentrically ,
Adjacent to the rotating bead core attached to the rotary table, a belt-like bead filler is continuously supplied and pasted on the slope of the rotary table,
Abutting and joining the front end and the rear end of the bead filler in the longitudinal direction;
A method for manufacturing a bead member. Grips the longitudinal leading and trailing portion of the bead filler after attaching the bonding method according to claim 1, wherein the bead members abut towards each other. A bead filler cutting device that has a bead filler height of 50 mm or more and cuts the longitudinal direction front end and rear end of the belt-shaped bead filler in the thickness direction;
Bead core is attached, the diameter of the top surface rotation axis a vertical direction rather smaller than the diameter of the lower surface, slope, and the rotary table of the truncated cone shape with an angle of 20 to 30 ° with respect to the horizontal plane,
A joining device that abuts and joins the front end and the rear end in the longitudinal direction of the bead filler after bonding;
An apparatus for manufacturing a bead member.

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