JP5881940B2 - Tire manufacturing apparatus and manufacturing method - Google Patents

Description

  The present invention relates to a tire manufacturing apparatus and manufacturing method in which a ribbon-shaped rubber is passed between a pair of rollers arranged opposite to each other, molded into a predetermined cross-sectional shape, held by one roller, and attached to a rotating support. In particular, the present invention relates to a tire manufacturing apparatus and manufacturing method that can prevent ribbon-like rubber from being held by the other roller.

When molding green tires for the purpose of downsizing the rubber extrusion equipment, improving tire uniformity, or dealing with small lot multi-size production, etc., the ribbon rubber extruded from a small rubber extruder is directly 2. Description of the Related Art A tire manufacturing apparatus and manufacturing method are known in which a tire support member having a predetermined cross section is assembled by being wound spirally around an outer surface of a rotating support.
In this tire manufacturing apparatus and manufacturing method, a ribbon-shaped rubber extruded through a die is molded with a cross-sectional shape between a pair of rollers arranged opposite to each other, and the molded ribbon-shaped rubber is adhered to the outer surface of a rotating support. It has been done.

  FIG. 4 is a side view schematically showing a schematic configuration of such a conventional tire manufacturing apparatus (see Patent Document 1). This tire manufacturing apparatus quantifies the hopper 21 for feeding a ribbon-shaped rubber material, the screw 22 for kneading and feeding the rubber material fed from the hopper 21, and the rubber material fed from the screw 22. A gear pump 23 for sending out and a base 24 for extruding the rubber material sent from the gear pump 23 in a ribbon shape are provided. In front of the base 24, a pair of rollers 25 and 26 connected to the base 24 via support members 25a and 26a are disposed. A rotating support 28 is disposed in front of the pair of rollers 25 and 26. The hopper 21, screw 22, gear pump 23, base 24, and pair of rollers 25 and 26 are integrally formed, and are provided on moving means 29 that can move along the outer peripheral surface of the rotation support 28.

  In this tire manufacturing apparatus, the ribbon-shaped rubber 27 extruded from the base 24 passes between the outer peripheral surfaces of the upper roller (rolling roller) 25 and the lower roller (sticking roller) 26 that are rotating in opposite directions. These are rolled on the outer peripheral surface (rolled surface) and continuously formed into a predetermined cross-sectional shape. The ribbon-shaped rubber 27 that has passed through the gap between the upper and lower rollers 25 and 26 is held by the outer peripheral surface of the lower roller 26 having a large outer peripheral surface after rolling and is rotated in the opposite direction to the lower roller 26. It is guided to the outer surface of the body 28, pressed against the outer surface of the rotary support 28, and pasted. At this time, the moving means 29 is moved in a direction along the outer surface of the rotary support 28, whereby the ribbon rubber 27 is spirally wound around the outer surface of the rotary support 28, and a rubber member such as a ribbon tread has a predetermined outer shape ( Contour).

FIG. 5 shows the shape of the opening of a conventional base 24 used in a rubber extruder of such a tire manufacturing apparatus. The base 24 has a mainly hexagonal opening 24c having sides 24a and 24b parallel in the vertical direction as shown in the figure, and the parallel sides 24a and 24b in the upper and lower sides are all flat and the ridge (projection or protrusion) is Does not exist.
When the opening 24c of the base 24 is hexagonal, the length a of the upper side 24a and the length b of the lower side 24b have a relationship of a = b. The length a of the upper and lower sides 24a, 24b regulates the contact length in the width direction with the roller of the ribbon-shaped rubber 27. Therefore, when the contact length between the discharged rubber and the upper and lower rollers 25 and 26 is the same and a = b, the adhesive force in the width direction of the extruded ribbon-like rubber 27 is the same. Therefore, when the conventional base 24 is used, the ribbon-shaped rubber 27 often comes into close contact with the rolling roller 25 that is the upper roller during the rolling of the ribbon-shaped rubber 27, and moves away from the sticking roller 26 that is the lower roller. It occurs that the rubber 27 cannot be guided to the green tire on the rotating support 28.

  Therefore, in the conventional tire manufacturing apparatus, the diameter of the outer peripheral surface of the lower roller 26 is larger than the diameter of the outer peripheral surface of the upper roller 25 as shown in FIG. The contact area in the vertical direction (or longitudinal direction) is made larger than that of the upper roller 25 so that the ribbon-like rubber 27 having adhesiveness is more easily held by the lower roller 26 than the upper roller 25.

However, simply increasing the diameter of the outer peripheral surface of one of the pair of rollers is insufficient to hold the ribbon-like rubber. Depending on the type of rubber, the temperature, etc., the ribbon-like rubber The tip may stick to the lower roller with a small diameter.
In order to deal with this problem, for example, as shown in Patent Document 2, a difference is made in the temperature or peripheral speed of the outer peripheral surfaces of a pair of rollers, one of the rollers is processed into a mirror surface, and the other roller is used as a ridge surface. Although measures such as finishing are performed to change the surface state of each outer peripheral surface, it cannot be said that any measures are sufficiently effective.

  Therefore, the applicant of the present invention first performs a mirror finish on the outer peripheral surface of the large-diameter roller (affixing roller) out of a pair of large-diameter and small-diameter rollers that are formed in a predetermined cross-sectional shape by passing the ribbon-shaped rubber. In addition, the outer peripheral surface of the small-diameter roller (rolling roller) is subjected to a mesh-like knurling process, and a minute gap is formed by knurling between the outer peripheral surface of the small-diameter roller and the ribbon-like rubber. An apparatus and method for forcibly peeling the ribbon-like rubber held on the outer peripheral surface of the small-diameter roller by injecting air from the nozzle of the air blowing means into the gap has been proposed (see Patent Document 3).

  However, this apparatus or method not only requires a separate air blowing means, but also when the rubber accumulates in a minute knurled gap on the outer peripheral surface of the small-diameter roller due to changes over time when used for a certain period of time, If the effect of processing is diminished, and if rubber enters the knurl part (uneven part) completely, the contact area between the roller and rubber will not only increase, but the rubber and ribbon accumulated in the knurl part It turned out that it becomes a subject that it becomes easy to adhere | attach with rubber | gum.

JP 2003-33960 A JP 2004-216726 A JP 2009-865 A JP 2006-346972 A

  Accordingly, the present invention has been made to solve the above-described conventional problems in the tire manufacturing apparatus and manufacturing method, and an object thereof is to form a ribbon-shaped rubber extruded from a rubber extruder and roll-formed with a pair of rollers. When rolling, it is to prevent the rolled ribbon-like rubber from sticking to one roller with a simple configuration.

The present invention relates to a rubber extruder for extruding rubber through a die, a pair of rollers that are arranged so that their outer peripheral surfaces face each other and are extruded into a predetermined cross-sectional shape, and a ribbon formed by the pair of rollers A tire manufacturing apparatus for holding a rubber-like rubber by one roller and sticking it to a rotating support, wherein one of the pair of rollers has a larger diameter than the other roller, and the base is a ribbon Tire-forming apparatus provided with a ridge processing section for forming a plurality of ridges only on the contact surface with the other roller of the contact surfaces of the rubber-like rubber with the pair of rollers.
The present invention includes a step of extruding rubber through a base, a step of molding rubber extruded by a pair of rollers arranged so that their outer peripheral surfaces face each other into a predetermined cross-sectional shape, and a molding by the pair of rollers. A method of manufacturing a tire comprising a step of holding a ribbon-like rubber with one roller and affixing the ribbon-like rubber to a rotating support, wherein the one roller of the ribbon-like rubber is more than the other roller by the ridge processing portion of the base. It is a tire manufacturing method including a step of forming a plurality of ridges only on the contact surface with the other roller among the contact surfaces with the pair of rollers having a large diameter.

According to the present invention, when a ribbon-shaped rubber extruded from a rubber extruder is rolled by a pair of rollers, the rolled ribbon-shaped rubber is brought into close contact with one roller (rolling roller) with a simple configuration. Can be prevented.
Therefore, the machine is not stopped as in the prior art, and inactive time and generation of green tire scrap can be suppressed.

1 is a side sectional view showing a schematic configuration of a tire manufacturing apparatus according to an embodiment of the present invention. It is sectional drawing which shows opening of the nozzle | cap | die of the rubber extruder in the manufacturing apparatus of the tire of this embodiment. It is sectional drawing of the ribbon-shaped rubber shape | molded with the nozzle | cap | die of the rubber extruder shown in FIG. It is a side view which shows typically schematic structure of the manufacturing apparatus of the conventional tire. It is sectional drawing which shows opening of the nozzle | cap | die of the rubber extruder in the conventional tire manufacturing apparatus.

Hereinafter, embodiments of the present invention will be described.
FIG. 1 is a side sectional view showing a schematic configuration of a tire manufacturing apparatus according to an embodiment of the present invention.
The tire manufacturing apparatus 1 includes an extruder 2 for extruding rubber and a pair of upper and lower rollers (upper roller: rolling roller 12A, lower roller) for rolling and sticking a ribbon-like rubber 15 extruded through a die 10 of the extruder 2. : The roller head 12 composed of the sticking roller 12B) and the rotary support 3 to which the rolled ribbon-like rubber 15 is attached. The lower roller 12B places the rolled ribbon-like rubber 15 on the rotary support 3 A green tire having a desired contour for winding is manufactured. In addition, the other structure of the sticking apparatus of the ribbon-shaped rubber 15 may be the same as the conventional thing demonstrated in relation to FIG. 4, for example.

FIG. 2 is a sectional view showing the opening 10d of the base 10 of the rubber extruder 2 shown in FIG.
The overall shape of the opening 10d of the base 10 is a hexagonal shape as in the prior art, but the upper side 10a is not flat as shown in the figure. It is different from things and the same in other respects. That is, the base 10 is formed by a concave strip 10c having a substantially triangular cross-section, which is a ridge processing portion of the upper side 10a, and a ridge 15a corresponding to the concave strip 10c (FIG. ) Is formed. On the other hand, the lower side 10b of the opening of the base 10 is formed flat.
Thus, by making the surfaces of the upper and lower sides of the opening of the base 10 different surface shapes, a ridge 15c is formed on one horizontal surface of the extruded ribbon-like rubber 15 and flat on the opposite side. A horizontal surface 15b is formed (FIG. 3).

FIG. 3 is a cross-sectional view of the ribbon-like rubber 15 molded by the base 10.
A plurality of ridges 15c are formed on the upper surface 15a of the ribbon-like rubber 15 extruded from the base 10 corresponding to the upper and lower sides 10a and 10b of the opening of the base 10, and the lower surface 15b is flat. It is formed on a flat surface.
Therefore, in the next rolling step, the upper surface 15a of the ribbon-like rubber 15 is in contact with the upper roller (rolling roller) 12A by the ridge 15c, so that the total contact length A in the width direction shown in FIG. It becomes shorter than the contact length B of the lower surface in contact with the lower roller (sticking roller) 12B. Therefore, the contact force acting during rolling is larger on the lower roller (sticking roller) 12B side than the contact surface with the upper roller (rolling roller) 12A. As a result, the ribbon-like rubber 15 can be prevented from coming into close contact with the rolling roller 12A during rolling, and the extruded ribbon-like rubber 15 can be reliably sent to the rotary support 3.
Further, by making the diameter of the lower roller 12B larger than the diameter of the upper roller 12A as in the prior art, it is possible to more reliably prevent the ribbon-like rubber 15 from sticking to the rolling roller 12A side during rolling.

  Here, it is preferable that the depth d of the ridge (projection) 15c formed on the ribbon-like rubber 15 is 0.3 to 0.5 mm. The reason is that if the depth d of the ridge 15c is less than 0.3 mm, the difference in contact length between the upper roller 12A and the lower roller 12B on the upper and lower surfaces of the ribbon-shaped rubber 15 becomes smaller. The effect of preventing the adhesion to the rolling roller 12A is reduced, and if the thickness exceeds 0.5 mm, the ribbon-shaped rubber 15 is attached to the rotary support 3 to form a desired contour, which may affect the contour. This is because it cannot be ignored.

  According to this embodiment, for example, as in the tire manufacturing apparatus described in Patent Document 3, air is jetted from the nozzles of the air blowing means into a fine gap formed by knurling the ribbon-like rubber. For example, it is only necessary to provide the base 10 formed with a concave section 10c having a triangular cross section and to form the ridge 15c on the contact surface with the upper roller (rolling roller) 12A of the ribbon-like rubber 15, Adhesion of the ribbon-like rubber 15 to the upper roller 12A can be effectively prevented.

In the above description, the opening of the base 10 of the rubber extruder 2 has been described as having a hexagonal shape. However, the present invention is not limited to this shape, and in short, the opening 10d of the base 10 has upper and lower sides 10a. 10b is only required to be parallel to each other, and the upper side 10a of the opening 10d of the base 10 is described as being formed with a concave section 10c having a substantially triangular cross section, but the upper and lower parallel sides of the opening 10d of the base 10 are parallel. A plurality of ridges 15c may be formed on one of the sides 10a and 10b, that is, on the side to be joined to the upper roller (rolling roller) 12A of the extruded ribbon-like rubber 15.
Further, in the above description, the upper roller 12A is described as a rolling roller and the lower roller 12B is described as a sticking roller. However, the present invention is not limited to this, and the relationship may be reversed. It only has to be configured.

  In the present invention, by using the above-mentioned base 10, in the case of using the conventional base 24, there was about 2% of the adhesion of the ribbon-shaped rubber to the rolling roller at the time of rolling molding, 0.2% % Could be reduced. Thus, the effectiveness of the tire manufacturing apparatus of the present invention was confirmed.

Conventionally, there has been known an extrusion apparatus (see Patent Document 4) provided with a substantially triangular recess for forming a ridge in the side portion of the opening of the base and performing ridge processing on the ribbon-like rubber. Explain just in case.
The extrusion apparatus with a ridge described in Patent Document 4 is an extrusion apparatus for forming a stiffener, and forms a plurality of substantially triangular recesses in an opening portion of a base of a rubber extruder, thereby forming a ridge in the stiffener. To do.

Here, the purpose of forming the ridge on the stiffener is that when the stiffener is loaded into the vulcanization mold and pressed against the mold surface from the inside by a bladder or the like, the ridge is pressed against the coating rubber of the carcass ply and crushed. This is for facilitating adhesion to the mating member.
Therefore, when compared with the present invention, the conventional base is common in that ridge processing is applied to the ribbon-like rubber at the side of the base, but the purpose thereof is also the object to be molded with the base. They are different and are merely similar in that they form a ridge on the ribbon-like rubber. In other words, the invention described in Patent Document 4 differs from the present invention in its object, purpose, and effect, and therefore has no relation to the present invention, and the present invention can be easily conceived from this invention. It is not something

  DESCRIPTION OF SYMBOLS 1 ... Tire manufacturing apparatus, 2 ... Rubber extruder, 3, 28 ... Rotating support 10, 24 ... Base, 12 ... Roller head, 12A ... Rolling roller, 12B ... Sticking roller, 15, 27 ... Ribbon rubber, 21 ... Hopper, 22 ... Screw, 23 ... Gear pump, 25, 26 ... Roller, 29 ... Moving means.

Claims (5)

A rubber extruder that extrudes rubber through a die, a pair of rollers that are arranged so that their outer peripheral surfaces face each other and that is extruded into a predetermined cross-sectional shape, and a ribbon-like rubber that is molded by the pair of rollers. A tire manufacturing apparatus that is held by a roller and attached to a rotating support,
Of the pair of rollers, one roller has a larger diameter than the other roller, and the base is only on the contact surface with the other roller of the contact surface of the ribbon-shaped rubber with the pair of rollers. A tire manufacturing apparatus including a ridge processing portion for forming a plurality of ridges. In the tire manufacturing apparatus according to claim 1,
The tire manufacturing apparatus is a plurality of ridges formed on one of mutually parallel sides defining the opening of the base. In the tire manufacturing apparatus according to claim 1 or 2,
The opening of the base is a tire manufacturing apparatus having a hexagonal shape with the parallel sides up and down. In the tire manufacturing apparatus according to any one of claims 1 to 3,
A tire manufacturing apparatus in which the ridge formed on the ribbon-like rubber has a depth of 0.3 to 0.5 mm. A step of extruding rubber through a base, a step of molding rubber extruded by a pair of rollers arranged so that their outer peripheral surfaces face each other into a predetermined cross-sectional shape, and a ribbon-like rubber molded by the pair of rollers. A method of manufacturing a tire having a step of holding it with one roller and attaching it to a rotating support,
A plurality of ridges are formed only on the contact surface with the other roller among the contact surfaces with the pair of rollers in which the one roller of the ribbon-like rubber has a larger diameter than the other roller by the ridge processing portion of the base. The manufacturing method of the tire which has the process of forming.

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