JP6356575B2 - Tire constituent member manufacturing method, tire manufacturing method, and tire constituent member manufacturing apparatus - Google Patents

Description

  The present invention relates to a tire component manufacturing method, a tire manufacturing method, and a tire component manufacturing device.

  The green tire before vulcanizing the tire is formed by shaping a laminated body formed by winding a plurality of tire constituent members such as an inner liner and a carcass on a tire molding drum, and then shaping the laminated body, It can be manufactured by further laminating a plurality of other tire constituent members such as a belt and a tread (see, for example, Patent Document 1). Here, when laminating each tire constituent member, if the tire constituent member is a sheet, after cutting to a predetermined size, the member is placed on a tire molding drum or on another tire constituent member. In general, both ends are jointed with each other.

JP 2012-240218 A

  By the way, as described above, in a conventional tire having a tire constituent member in which both end portions are jointed and laminated, there is a concern that the adhesive strength of the joint portion may be reduced or there is a concern from the viewpoint of tire uniformity. It was.

  Therefore, the present invention provides a tire component manufacturing method that can manufacture a tire component that is jointless, a tire manufacturing method that can efficiently manufacture a tire using the tire component, and the tire. It aims at providing the tire structural member manufacturing apparatus which can be used suitably in order to manufacture a structural member.

In the tire component manufacturing method of the present invention, a molten tire component is injected and filled in a closed region at least partitioned by an inner core and a cylindrical outer core surrounding the inner core from the radially outer side of the inner core. Including an injection molding process.
According to the tire constituent member manufacturing method of the present invention, a jointless tire constituent member can be manufactured.

Here, in the tire component manufacturing method of the present invention, the tire component is preferably an inner liner made of a rubber member. This is because there is a concern about the adhesive strength of the joint portion of the inner liner among the plurality of tire constituent members, and it is preferable to manufacture the inner liner made jointless by this tire constituent member manufacturing method.
In this case, the inner core is preferably a tire molding drum. According to this configuration, productivity in tire manufacture can be improved.

Further, in the tire component manufacturing method of the present invention, in the injection molding step, after the molten region is filled with a predetermined amount of the melted tire component, the pressure is higher than the pressure when the molten tire component is injected. It is preferable to include an indentation step in which the melted tire constituent member is further indented at a high pressure.
According to this configuration, it is possible to suppress the occurrence of bear (air entering) or the like in the tire constituent member.

In the tire constituent member manufacturing method of the present invention, it is preferable that the injection molding step includes a cooling step of cooling the tire constituent member injected into the closed region.
According to this configuration, the productivity in tire manufacture can be further improved.

Here, in the tire manufacturing method of the present invention, the tire constituent member manufactured by the tire constituent member manufacturing method is placed on the outer peripheral surface of the tire constituent member in a state where the tire constituent member is placed on the tire molding drum. It includes a molding step of mounting the tire constituent member and molding the tire.
According to the tire manufacturing method of the present invention, a tire can be efficiently manufactured using a joint-less tire component.

The tire component manufacturing apparatus of the present invention includes an inner core, a cylindrical outer core that surrounds the inner core from the radially outer side of the inner core, and a closed region that is at least partitioned by the inner core and the outer core. And an injection machine for injecting a molten tire constituent member.
According to the tire component manufacturing apparatus of the present invention, a jointless tire component can be preferably manufactured.

Here, in the tire component manufacturing apparatus of the present invention, it is preferable that the inner core and / or the outer core include a heater.
According to this structure, a tire structural member can be manufactured efficiently.

  ADVANTAGE OF THE INVENTION According to this invention, the tire structural member manufacturing method which can manufacture the tire structural member made into jointless, the tire manufacturing method which can manufacture a tire efficiently using the said tire structural member, and the said tire A tire component manufacturing apparatus that can be suitably used for manufacturing the component can be provided.

(A) is a schematic diagram which shows the tire structural member manufacturing apparatus which concerns on one Embodiment of this invention, (b) is a- of the inner core of the tire structural member manufacturing apparatus shown to (a), and an outer core. It is a figure which shows the cross section which follows a line. It is a perspective view which shows the tire manufacturing apparatus which can be used in order to implement the tire manufacturing method which concerns on one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Tire component manufacturing device>
First, an embodiment of a tire component manufacturing apparatus according to the present invention will be described with reference to FIG.
A tire component manufacturing apparatus 1 according to an embodiment of the present invention is a rubber member such as an inner liner, a stiffener rubber, a cushion rubber, or a squeegee rubber used between layers, which constitutes a green tire before vulcanizing the tire. Certain tire components can be manufactured. The tire constituent member manufacturing apparatus 1 is at least partitioned by an inner core 2, a cylindrical outer core 3 that surrounds the inner core 2 from the radially outer side of the inner core 2, and the inner core 2 and the outer core 3. And an injection machine 4 for injecting the molten tire constituent member into the closed region CR.

  As shown in FIG. 1A, the injection machine 4 includes a cylindrical cylinder 41 and a screw 42 disposed in the cylinder 41. The screw 42 is a motor (not shown). And is rotated by a hydraulic cylinder (not shown) so as to advance and retreat in the cylinder 41 so that a molten tire component can be injected. The cylinder 41 is provided with a heater 43 covering its outer periphery, and the inside of the cylinder 41 is heated by the heater 43. Furthermore, a hopper 44 is provided on the base end side (upper side in the drawing) of the cylinder 41 for feeding the material of the tire constituent member for injection molding into the cylinder 41. Further, the front end (lower end in the figure) of the cylinder 41 is connected to the outer core 3 as a mold so as to be able to advance and retreat, and the inner space of the cylinder 41 is connected to the inner core 2 as a mold. It is in a state of communicating with a closed region CR (cavity) that is at least partitioned by the outer core 3.

  As shown in FIG. 1B, the inner core 2 has a cylindrical outer peripheral surface and is entirely cylindrical in this embodiment, and has a cylindrical shape surrounding the inner core 2 from the outside in the radial direction. The length in the axial direction is longer than that of the outer core 3. The inner core 2 is provided with cooling means 21 for cooling the inner periphery thereof. As the cooling means 21, a cooling medium for passing a cooling medium, for example, cooling water, or air cooling can be used as in the illustrated example. The outer diameter of the inner core 2 is the same as or slightly smaller than the inner diameter of the tire constituent member to be manufactured.

As shown in FIG. 1B, the outer core 3 has a cylindrical shape, in this embodiment, a cylindrical inner peripheral surface and is entirely cylindrical, and has a larger diameter than the inner core 2. In addition, the length is shorter in the axial direction than the inner core 2. The outer core 3 is detachable from the inner core 2. For example, the outer core 3 is opened in the circumferential direction at a dividing line (not shown) extending in the axial direction of the outer core 3. 3 can be removed. Further, the outer core 3 has a connection part 31 connected to the front end of the cylinder 41 of the injection machine 4. In the illustrated example, the connection part 31 is one place, but by having a plurality of places, the outer core 3 is provided. The material may be injected into the closed region CR from a plurality of locations.
Further, the outer core 3 of the present embodiment has an end wall that protrudes radially inward from the axial end of the outer core 3 at both axial ends of the outer core 3, although illustration is omitted. When the outer core 3 is attached to the inner core 2, a closed region CR is formed by the inner core 2 and the inner peripheral surface of the outer core 3 having the end wall. In this embodiment, the end wall is provided integrally with the outer core 3. However, the end wall may be provided on the inner core 2, or may be provided separately from the inner core 2 and the outer core 3. In this case, the width of the tire constituent member manufactured by the tire constituent member manufacturing apparatus 1 can be changed by changing the axial position of the end wall.

  Although not shown in the drawings, the inner core 2 and / or the outer core 3 can be provided with a vent hole that allows the closed region CR to communicate with the outside of each core. Thus, when the tire constituent member is filled, the residual air remaining in the closed region CR can be discharged. In addition, a vacuum device can be connected to the vent hole as necessary.

  Although the inner core 2 and / or the outer core 3 are not shown, it is preferable to include a heater. Specifically, for example, on the inner peripheral surface of the inner core 2, the outer peripheral surface of the outer core 3, and / or Alternatively, the heater can be disposed by being embedded in at least one of the cores 2 and 3. Accordingly, it is possible to prevent the temperature of the material from being lowered and the fluidity from being lowered or the weld line or the like from being generated while the material of the tire constituent member is filled in the closed region CR. A member can be manufactured efficiently.

Further, the inner core 2 and / or the outer core 3 may be capable of expanding / contracting the diameter, whereby the thickness and the diameter of the tire constituent member can be adjusted. Moreover, if the inner core 2 can be expanded and contracted, for example, after manufacturing the tire constituent member and removing the outer core 3, the inner core 2 can be reduced in diameter so that the tire constituent member can be easily taken out. Further, if the outer core 3 can be expanded / contracted, for example, after manufacturing the tire component, the outer core 3 is expanded to form another tire component in the space formed by expanding the diameter and laminated. It can also be structured.
Further, the inner core 2 and / or the outer core 3 may be extendable / contractable in the axial direction thereof, whereby the width of the tire constituent member can be adjusted.

  As described above, according to the tire component manufacturing apparatus 1, the inner core 2, the cylindrical outer core 3 that surrounds the inner core 2, and the closed region CR at least partitioned by the inner core 2 and the outer core 3. Since the injection device 4 for injecting the molten tire constituent member is provided, a jointless tire constituent member can be suitably manufactured in the closed region CR.

  Here, when the tire constituent member manufactured by the tire constituent member manufacturing apparatus 1 is an inner liner, the inner core 2 is preferably a tire molding drum used in the tire manufacturing apparatus. If the inner core 2 is a drum for tire molding, the tire constituent member is injected into the closed region CR, and after molding, the inner liner as the tire constituent member is not removed from the inner core 2 and another tire is placed on the outer periphery of the inner liner. This is because the constituent members can be wound and stacked, and the productivity of tire manufacture can be improved. Here, the tire molding drum has a function of expanding and reducing the diameter of the drum, and is a drum that forms a laminate by laminating inner liners, carcass, and the like that are tire constituent members on the outer peripheral surface thereof. If necessary, a side tread or a bead can be further set to form a folded structure around the bead of the carcass. Further, the surface of the tire molding drum can be formed of metal.

<Tire component manufacturing method>
Next, an embodiment of the tire component manufacturing method of the present invention will be described with reference to FIG.
In the tire component manufacturing method according to an embodiment of the present invention, the inner core 2 and the cylindrical outer core 3 that surrounds the inner core 2 from the outer side in the radial direction of the inner core 2 are melted in the closed region CR. An injection molding step of injecting and filling the completed tire constituent member.
In addition, since the tire structural member manufacturing method of this invention can be implemented suitably using the tire structural member manufacturing apparatus of embodiment mentioned above, below, it demonstrates taking the case of using the said tire structural member manufacturing apparatus as an example. The description of the same elements as those described above will be omitted as appropriate.

  First, in the tire component manufacturing method of the present embodiment, the inner core 2 and the outer core 3 are adjusted and combined so that the tire component to be manufactured has a predetermined diameter, width, and thickness. The four cylinders 41 are connected to the connecting portion 31 of the outer core 3. The outer peripheral surface of the inner core 2 and the inner peripheral surface of the outer core 3 are separated from the inner core 2 in order to make it easier to remove the outer core 3 from the tire component or to easily take out the member from the inner core 2. An agent or the like can be applied in advance. Moreover, if the heater 43 is provided in the inner core 2 or the outer core 3, after combining the inner core 2 and the outer core 3, it can also pre-heat before injection of the tire structural member to the closed region CR.

  Next, the closed region CR is filled with a molten tire constituent member (injection molding process). Specifically, first, the material of the tire constituent member to be melt-molded is put into the hopper 44 of the injection machine 4, transported into the cylinder 41, heat transfer by the heater 43 and rotation of the screw 42 in the cylinder 41. The material is heated and melted by the heat generated by the shearing by. Then, after the material of the tire component is pumped forward in the cylinder 41 by the rotation of the screw 42, the screw 42 is advanced while controlling the speed by the hydraulic cylinder, and the outer core 3 and the inner core are moved from the front end of the cylinder 41. The molten material is injected into the closed region CR (cavity) between the cores 2 and filled. In addition, when using multiple types as a material of a tire structural member, it can also knead | mix by rotation of the screw 42, after throwing into a hopper.

  At the time of injection injection of the molten material, in the inner core 2 and the outer core 3, for example, on the inner peripheral surface of the inner core 2, on the outer peripheral surface of the outer core 3, and / or at least one of the cores 2, 3 In the case where a heater (not shown) is provided, the temperature of the member is lowered and fluidity is lowered until the melted tire constituent member is filled in the closed region CR by heating with the heater. It is also possible to prevent the occurrence of a drop in the weld line or the like.

  Here, in the injection molding step of injecting and filling the melted tire component member into the closed region CR, the tire component member is injected into the closed region CR and filled with a predetermined amount as described above, and then the molten tire is filled. It is preferable to perform an indentation step in which the melted tire constituent member is further pushed in at a pressure higher than the pressure when the constituent member is injected. By this process, the residual air in the closed region CR can be exhausted to the outside of the inner core 2 and the outer core 3, thereby preventing, for example, a bear that is a defect due to the residual air. At this time, when the inner core 2 and / or the outer core 3 has an exhaust vent hole, the exhaust can be efficiently exhausted from the vent hole. In addition, the melted tire constituent member can be pushed in the pushing step while controlling the pressure of the screw 42 with a hydraulic cylinder.

  Moreover, it is preferable that the said injection molding process includes the cooling process which cools the tire structural member injected in the closed area | region CR. Since the manufactured tire constituent member can be quickly solidified by the cooling step, the outer core 3 can be removed or the tire constituent member can be removed from the inner core 2 at an early stage while preventing deformation of the tire constituent member. And productivity can be improved. In addition, cooling can be performed by the cooling means 21 which can be provided in the internal peripheral surface of the inner core 2, for example, piping for cooling, or air cooling. In addition, the cooling step can be performed after the indentation step is performed, or when the indentation step is not performed, the cooling region can be performed after the melted tire constituent member is filled in the closed region CR. .

  After performing the injection molding process, the injector 4 is removed from the connecting portion 31 of the outer core 3 and, for example, the outer core 3 is opened in the circumferential direction with a dividing line (not shown) extending in the axial direction of the outer core 3 as a boundary. For example, the outer core 3 is removed. In addition, after removing the outer core 3, when a burr | flash is provided in a tire structural member and a vent hole is provided in the inner core 2 or the outer core 3, since a thin columnar part may be formed, the said burr | flash or columnar part It is preferable to include the process of removing.

  After the outer core 3 is removed, the tire constituent members arranged on the outer periphery of the inner core 2 are removed from the inner core 2 and placed on the tire molding drum of the tire manufacturing apparatus. The movement from the inner core 2 onto the tire molding drum can be performed using, for example, a transport device of a tire manufacturing apparatus. Specifically, the inner core 2 is positioned inside the conveying device so as to be covered with the conveying device, and the tire constituent members formed on the outer periphery of the inner core 2 are gripped by the conveying device. After being gripped by the transport device, in that state, the transport device is moved so that the tire molding drum of the tire manufacturing device is positioned inside the transport device, and the tire constituent member is placed on the outer periphery of the tire molding drum. To do.

  As described above, according to the tire component manufacturing method according to the present embodiment, the tire melted in the closed region CR at least partitioned by the inner core 2 and the cylindrical outer core 3 surrounding the inner core 2. Since it includes an injection molding step of injecting and filling the constituent members, the tire constituent members made jointless can be directly manufactured on the inner core 2 and may be caused by the presence of the joint portion. In the first place, a decrease in the adhesive strength of the joint portion does not occur. In addition, the tire uniformity can be improved by jointlessness. Furthermore, since steps such as rolling and cutting, which are necessary when manufacturing a conventional sheet-like tire constituent member, can be omitted, productivity in tire manufacturing can be improved.

Here, in the tire component manufacturing method, the tire component is preferably an inner liner. Unlike the other tire constituent members, the inner liner located on the innermost lumen side of the tire is not sandwiched between the tire constituent members (that is, there are no other tire constituent members inside the inner liner). When there is a concern about the adhesive strength of the joint part, when the inner liner is manufactured by this method for manufacturing a tire constituent member, the effect of making the jointless is particularly great.
Moreover, when the tire component to be manufactured is an inner liner, the inner core 2 is preferably a tire molding drum. According to this, the inner liner injection-molded on the inner core 2 can be transferred to a step of further laminating other tire constituent members without moving to the tire molding drum as described above. Productivity can be improved.

  Moreover, in the tire component manufacturing method of the present invention, after the tire component is manufactured, the outer core 3 is removed, and the outer core 3 is manufactured using an outer core having an inner diameter different from that of the outer core 3. Another tire constituent member can be formed into a multilayer tire constituent member.

<Tire manufacturing method>
Next, an embodiment of the tire manufacturing method of the present invention will be described with reference to FIG.
First, the tire manufacturing apparatus 5 shown in FIG. 2 will be described. The tire manufacturing method of the present embodiment is performed using the tire manufacturing apparatus 5. The tire manufacturing apparatus 5 is a manufacturing apparatus for manufacturing a green tire, and the tire manufacturing apparatus 5 includes a molding unit 6 and a supply unit 7. The molding means 6 includes a drive unit 61 installed on the floor 51 and including a drive motor (not shown), and a cylindrical tire molding drum 62 that is supported by the drive unit 61 and can be expanded and contracted. The tire molding drum 62 can be rotated around a horizontal axis line by receiving a driving force from the driving motor of the driving unit 61. The supply means 7 is installed on the side (upper side in FIG. 2) of the tire molding drum 62. The supply means 7 is connected to the tire molding drum 62 when the tire molding drum 62 is rotating. Then, a belt-like tire constituent member such as a carcass is supplied, and the tire constituent member is wound around the tire molding drum 62 one after another. As a result, a cylindrical cylindrical band including a carcass is formed around the tire molding drum 62.

  The tire manufacturing apparatus 5 has a pair of guide rails 52 laid on the floor 51 and extending in parallel with the axis of the tire molding drum 62, and a transport body 8 slidably supported by the guide rails 52. These guide rails 52 extend linearly from directly under the tire molding drum 62 to the front (rightward in FIG. 2) to directly under the shaping drum (not shown) for shaping the cylindrical band. The carrier 8 can move in the front-rear direction along the guide rail 52 by receiving a driving force from a driving mechanism (not shown). Here, since the transport body 8 can grip the cylindrical band from the outside in the radial direction, the transport body 8 receives the cylindrical band from the tire molding drum 62 and grips it from the outside in the radial direction, and then transports it from the drive mechanism. When a driving force is applied to the body 8, the transport body 8 transports it forward, here toward the shaping drum, while gripping the received cylindrical band.

  Although not shown, the tire manufacturing apparatus 5 receives a cylindrical band from the carrier 8 that holds the cylindrical band, and shapes the received cylindrical band, and a belt tread composed of a belt and a tread. It further includes a tire molding drum that forms a band, and a conveyor that moves the belt tread band from the tire molding drum to the shaping drum. In the tire manufacturing apparatus 5, the cylindrical band is shaped by the shaping drum that has received the shape, and the belt / tread band is moved from the tire molding drum on which the belt / tread band is formed to the shaping drum by the conveyance body, and shaped. A green tire can be formed on the drum.

  Here, the tire manufacturing method according to an embodiment of the present invention is the tire configuration in which the tire constituent member manufactured by the tire constituent member manufacturing method of the present invention is placed on the tire molding drum 62. It includes a molding step in which another tire constituent member is placed on the outer peripheral surface of the member to mold the tire.

Specifically, since the tire component (inner liner) is manufactured with the inner core and the outer core that are the tire molding drum 62, the manufactured tire component is moved from the inner core (tire molding drum 62). The above-mentioned cylindrical band can be formed without causing it.
In the case where the inner core is the tire molding drum 62, the tire molding drum 62 usually has a drum diameter that can be expanded in multiple stages (in this embodiment, three stages). While producing an inner liner as a tire constituent member at a drum diameter of the eye, a cylindrical band can be produced by laminating other tire constituent members. Thus, after the cylindrical band is manufactured, the cylindrical band is gripped by the conveying device with the tire molding drum 62 in the maximum diameter state, and then the tire molding drum 62 is in the minimum diameter state. It can be delivered smoothly.

  As described above, in the tire manufacturing method, the tire constituent member manufactured by the tire constituent member manufacturing method of the present invention is placed on the outer peripheral surface of the tire constituent member in a state where the tire constituent member is placed on the tire molding drum 62. The tire can be efficiently manufactured using the joint-less tire constituent member by placing the other tire constituent member and molding the tire.

In the case where the tire constituent member is manufactured with the inner core and the outer core that are not the tire molding drum 62, the inner core is used to place the tire constituent member on the tire molding drum 62. In order to move the tire constituent member located on the upper side to the tire molding drum 62, it can be carried out using the carrier 8 shown in FIG. Specifically, for example, the tire constituent member manufactured on the inner core is gripped by the transport body 8, delivered to the tire molding drum 62 of the molding means 6 in the figure, and mounted on the tire molding drum 62. It can be put in a state of being placed.
Further, in this case, before moving the tire constituent members manufactured with the inner core and the outer core other than the tire molding drum 62 and placing them on the tire molding drum 62, other tire constituent members are attached. It can also be formed by wrapping around the tire molding drum 62.

  As mentioned above, although embodiment of this invention was described with reference to drawings, the tire structural member manufacturing method of this invention, a tire manufacturing method, and a tire structural member manufacturing apparatus are not limited to said example, Changes can be made as appropriate.

  According to the present invention, a tire component manufacturing method capable of manufacturing a jointless tire component, a tire manufacturing method capable of efficiently manufacturing a tire using the tire component, and the tire A tire component manufacturing apparatus that can be suitably used for manufacturing the component can be provided.

1: Tire component manufacturing apparatus 2: Inner core 21: Cooling means 3: Outer core 31: Connection part 4: Injection machine 41: Cylinder 42: Screw 43: Heater 44: Hopper 5: Tire manufacturing apparatus 51: Floor 52: Guide rail 6: Molding means 61: Driving unit 62: Tire molding drum 7: Supply means 8: Conveying body CR: Closed region

Claims (5)

A method of manufacturing a tire component,
At least delimited closed region a cylindrical outer core surrounding the inner core and the inner core from the radially outer side of the inner core, viewed including the injection molding step of filling is injected molten tire component,
The tire constituent member manufacturing method, wherein the tire constituent member is an inner liner made of a rubber member . The tire component manufacturing method according to claim 1 , wherein the inner core is a tire molding drum. In the injection molding process, after the predetermined amount of the melted tire constituent member is filled in the closed region, the molten tire constituent member is further pushed in at a pressure higher than the pressure when the molten tire constituent member is injected. includes pushing step, the tire component fabricating method as claimed in claim 1 or 2. The tire constituent member manufacturing method according to any one of claims 1 to 3 , wherein the injection molding step includes a cooling step of cooling the tire constituent member injected into the closed region. 5. The tire component manufactured by the method for manufacturing a tire component according to claim 1, 3 or 4 , wherein the inner core is a tire molding drum, in a state where the tire core is mounted on the tire molding drum. A tire manufacturing method comprising a molding step of molding another tire by placing another tire component on the outer peripheral surface of the component.

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