JP2016097620A - Green tire molding apparatus and green tire molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a green tire molding apparatus effective for suppressing influence on a lead time and suppressing air entering.SOLUTION: A molding apparatus includes a molding drum 1 which has a winding surface 10 for winding a green tire constitution component including a side wall rubber C1 and cylindrically molding the same, and a transfer 2 which has a holding surface 21a for holding an outer peripheral surface of the cylindrical green tire constitution component molded by the molding drum 1 and transports the same. The holding surface 21a is provided with plural needle parts 3, and the winding surface 10 is provided with needle reception recesses 5 corresponding to the needle parts 3. When the cylindrical green tire constitution component molded by the molding drum 1 is held by the transfer 2, the needle part 3 is pierced into the side wall rubber C1 and is pressed to the needle reception recess 5, whereby an open hole can be formed on the side wall rubber C1.SELECTED DRAWING: Figure 4C

Description

  The present disclosure relates to a raw tire forming apparatus and a raw tire forming method for forming a raw tire before vulcanization using a raw tire constituent member such as a sidewall rubber.

  As a raw tire molding method, a raw tire constituent member including a sidewall rubber and a carcass ply is molded into a cylindrical case with a mold drum that can be expanded and contracted, and the case is gripped by a transfer and transferred to a shaping drum. Is known to form a raw tire in an unvulcanized state by deforming the case into a toroidal shape and combining the separately formed tread portion and the case. When the case is deformed into a toroidal shape, the side wall rubber is affixed to the carcass ply. At this time, the side wall rubber entrains air, and the tire may become defective due to the air entering.

  In Patent Document 1, there is a description that, in forming a raw tire, air entry can be reduced by forming a plurality of holes in the rubber member before being attached to the carcass ply.

JP 2006-88586 A

  However, it is expensive to manually perform the hole forming step, and the lead time may be affected by providing the hole forming step separately from the conventional step.

  The present disclosure has been made paying attention to such a problem, and an object of the present disclosure is to provide a raw tire molding apparatus and a raw tire molding method that are effective in suppressing the influence on lead time and suppressing air entry. Is to provide.

  In order to achieve the above object, the present disclosure takes the following measures.

  A raw tire molding apparatus according to the present disclosure includes a forming drum having a winding surface for winding a raw tire constituent member including a sidewall rubber to form a cylindrical shape, and a cylindrical raw tire configuration formed on the forming drum. A transfer surface having a gripping surface for gripping and transporting the outer peripheral surface of the member, and a plurality of needle portions are provided on one of the gripping surface and the winding surface, and the gripping surface and the winding surface A plurality of needle receiving recesses are provided on either side of the surface corresponding to the needle portion, and when the cylindrical raw tire constituent member formed on the forming drum is gripped by the transfer, the needle portion A through hole can be formed in the sidewall rubber by piercing the side wall rubber and pressing it against the needle receiving recess.

  The raw tire molding method of the present disclosure includes a forming drum having a winding surface for winding a raw tire constituent member including a sidewall rubber to form a cylindrical shape, and a cylindrical raw tire configuration formed on the forming drum. A transfer surface having a gripping surface for gripping and transporting the outer peripheral surface of the member, and a plurality of needle portions are provided on one of the gripping surface and the winding surface, and the gripping surface and the winding surface Using the green tire forming apparatus provided with a plurality of needle receiving recesses corresponding to the needle portion on either one of the attached surfaces, the cylindrical raw tire constituent member formed on the forming drum is gripped by the transfer In this case, the method includes a step of forming a through hole in the sidewall rubber by piercing the needle portion into the sidewall rubber and pressing the needle portion against the needle receiving recess.

  According to the above apparatus and method, the through hole can be formed in the sidewall rubber when the cylindrical raw tire constituent member formed on the forming drum is gripped by the transfer and conveyed to the next process. Therefore, since the hole forming step is executed in the transporting step without providing a separate hole forming step, the raw tire molding apparatus and method that can suppress the influence on the lead time and are effective for suppressing air entry. Can be provided.

The side view which shows typically the raw tire shaping | molding apparatus in this embodiment. The schematic diagram which looked at the raw tire shaping | molding apparatus in this embodiment from the axial direction. The schematic diagram which shows the needle part and needle receiving recessed part which are provided in a shaping | molding apparatus. Explanatory drawing regarding operation | movement of a needle part and a needle receiving recessed part. Explanatory drawing regarding operation | movement of a needle part and a needle receiving recessed part. Explanatory drawing regarding operation | movement of a needle part and a needle receiving recessed part.

  Hereinafter, an embodiment of the present disclosure will be described.

[Molding equipment]
As shown in FIGS. 1 and 2, the green tire molding apparatus includes a molding drum 1 and a transfer 2.

  The forming drum 1 has a winding surface 10 for winding a green tire constituent member and forming it into a cylindrical shape. The raw tire constituent member formed into a cylindrical shape is also referred to as a case C. The forming drum 1 is composed of a plurality of drum pieces 11 and 11 that are divided in the circumferential direction. By reducing the diameter of each drum piece, the winding surface 10 formed on each drum piece 11 is also reduced in diameter. The case C can be removed from the molding drum 1. As shown in FIG. 1, the case C has a rubber chacher C4 wound around the inner liner C3 and the sidewall rubber C1, and a carcass ply C2. The sidewall rubber C1 is folded back and attached to another member (such as a carcass ply) in a later step. When the sidewall rubber C1 is molded on the molding drum 1, the outer peripheral side is the inner side in the tire width direction, and the inner peripheral side is the outer side in the tire width direction.

  The transfer 2 is provided with a plurality of annular frames 20 along the circumferential direction on the inner circumferential side of the annular frame 20, and a segment 21 that can grip the outer circumferential surface of the case C by being configured to be expandable and contractable in the radial direction. Have Each segment 21 has an arc-shaped gripping surface 21 a corresponding to the outer periphery of the case C when viewed along the axial direction of the annular frame 20. Each segment 21 is configured to be movable by a driving mechanism (not shown) to either the gripping position p1 moved radially inward or the non-grip position p2 moved radially outward. The annular frame 20 is mounted or suspended on a rail (not shown), and is configured to be movable in parallel along the axis of the forming drum 1.

  As shown in FIG. 1, a plurality of needle portions 3 are provided on a portion of the gripping surface 21 a of the transfer 2 that grips the sidewall rubber C <b> 1. As shown in FIG. 3, the needle portion 3 has a conical shape, is disposed in the hole 21h of the segment 21, and is provided so as to be slidable along the radial direction. The projecting position p4 (see FIGS. 4B and 4C) projecting from the gripping surface 21a of the segment 21 through the hole 21h and the non-projecting position p3 (see FIG. 3) retracted from the gripping surface 21a can be switched. It is configured. A driving unit 4 for driving each needle unit 3 from the non-projecting position p3 to the projecting position p4 is provided. The drive unit 4 is preferably capable of driving some needle units 3 independently of the other needle units 3. Thus, the drive part 4 is comprised so that each needle part 3 can be driven independently, By changing the density of the needle part 3 which pierces the sidewall rubber C1, or the needle which drives according to a tire size Part 3 can be selected. In the present embodiment, the drive unit 4 is an air cylinder, and the needle unit 3 is driven by air, but is not limited thereto. For example, a servo motor or the like can be used as the drive unit.

  As shown in FIG. 1, a plurality of needle receiving recesses 5 are provided corresponding to the needle portions 3 in the portion of the winding surface 10 of the forming drum 1 where the sidewall rubber C <b> 1 is disposed. As shown in FIG. 3, the needle receiving recess 5 has a support surface 50 that supports the sidewall rubber C <b> 1 and is formed in a hollow cylindrical shape having a recess 51 into which the needle 3 is inserted. The needle receiving recess 5 is disposed in the hole of the drum piece 11 and is provided so as to be slidable along the radial direction. The needle receiving recess 5 is configured to be movable from a support position p5 (see FIG. 3) supporting the sidewall rubber C1 to a non-support position p6 (see FIGS. 4B and 4C) by the pressing force of the needle part 3. Further, a biasing member 6 that biases the needle receiving recess 5 from the non-supporting position p6 toward the support position p5 is provided. Examples of the urging member 6 include a coil spring, but are not limited thereto.

  The diameter of the needle part 3 is preferably 2 to 3 mm. When the diameter of the needle portion 3 is smaller than 2 mm, the effect of bleeding through the through hole is difficult to be exhibited. When the diameter of the needle portion 3 is larger than 3 mm, the through hole becomes too large and the through hole is formed during vulcanization of the tire. This is because the risk of being unable to close is increased. The length (protrusion amount) of the needle part 3 is preferably about 1.1 to 1.5 times the thickness of the sidewall rubber C1. This is to allow the sidewall rubber C1 to penetrate accurately. Moreover, it is preferable that the needle part 3 is one in 4 cm square or more. This is because if the density is further increased, there is an increased risk that the through-holes cannot be blocked during vulcanization of the tire.

  A molding method using the apparatus having the above configuration will be described.

  When the raw tire constituent member is molded into a cylindrical shape on the forming drum 1 and the case C is completed, the transfer 2 is arranged such that the case C (cylindrical raw tire constituent member) is positioned inside each segment 21 in the radial direction. The segment 21 is moved relative to the molding drum 1 in a state where the segment 21 is moved to the non-gripping position (see FIG. 1). The relative movement means that only the transfer 2 may move, only the molding drum 1 may move, or both the transfer 2 and the molding drum 1 may move.

  If the case is positioned on the radially inner side of each segment 21, the transfer 2 moves each segment 21 from the non-gripping position p2 to the gripping position p1 and grips the case C as shown in FIGS. 2 and 4A.

  Next, as shown in FIG. 4B, the needle part 3 corresponding to the exposed part of the sidewall rubber C1 is moved from the non-projecting position p3 to the projecting position p4 by the driving force of the driving part 4, and the needle part 3 Is inserted into the side wall rubber C1 and pressed against the needle receiving recess 5 to form a through hole in the side wall rubber C1. Since the needle portion 3 is provided on the transfer 2 side and the needle receiving recess 5 is provided on the molding drum 1 side, the needle portion 3 has a through hole from the inner side in the tire width direction to the outer side in the tire width direction. Form. Since the needle part 3 has a tapered conical shape, a through-hole is formed in which the inner side in the tire width direction has a large diameter and the outer side in the tire width direction has a small diameter. As shown in FIGS. 4A and 4B, the needle receiving recess 5 is held at the support position p <b> 5 by the urging force of the urging member 6 until it is pushed by the needle portion 3. When the needle receiving recess 5 is pushed by the needle portion 3, the needle receiving concave portion 5 loses its pressing force and moves from the support position p5 (see FIG. 4B) to the non-support position p6 (see FIG. 4C). At this time, the needle receiving recess 5 is separated from the sidewall rubber C1.

  Next, the needle portion 3 is returned from the protruding position p4 to the non-projecting position p3 by the drive unit 4, and the needle receiving recess 5 is returned from the non-supporting position p6 to the supporting position p5. Next, the diameter of the forming drum 1 is reduced, and the case C is separated from the forming drum 1 and transferred to the next step by the transfer 2.

[Other Embodiments]
In the above embodiment, the needle portion 3 is provided on the transfer 2 side and the needle receiving recess 5 is provided on the molding drum 1 side. However, the needle portion 3 is provided on the molding drum 1 side and the needle receiving recess 5 is provided on the transfer 2 side. May be provided.

  In the above embodiment, the needle portion 3 is configured to be movable. However, when the needle portion 3 is provided on the transfer 2 side, the needle portion 3 may be fixed. This is because if the needle portion 3 is a fixed type, the configuration of the apparatus can be simplified. If the needle part 3 is movable and configured to be driven independently, it can accommodate a plurality of types of tire sizes, and the density of through holes formed in the sidewall rubber C1 can be changed.

  In the above embodiment, the protruding amount of the needle portion 3 is constant, but the protruding amount can be made variable by controlling the driving amount of the driving unit (for example, the driving amount of the motor). If the protruding amount is variable, it is possible to cope with sidewall rubbers having various thicknesses.

  In the above embodiment, the needle receiving recess 5 is configured to be movable, but may be fixed. This is because the fixed type is preferable in that the apparatus configuration can be simplified. Even in the fixed type, it is possible to suppress the occurrence of burrs in the sidewall rubber by inserting the needle portion 3 into the recess 51. Furthermore, if it is a movable type, a through-hole can be accurately formed in the sidewall rubber C1 as compared to the fixed type.

As described above, the green tire molding apparatus according to the present embodiment includes the molding drum 1 having the winding surface 10 for winding the green tire constituent member including the sidewall rubber C1 and molding it into a cylindrical shape, and the molding drum 1. And a transfer 2 having a gripping surface 21a for gripping and transporting the outer peripheral surface of the molded cylindrical raw tire constituent member. A plurality of needle portions 3 are provided on one of the gripping surface 21 a and the winding surface 10, and a plurality of needle receiving recesses 5 are provided on the other of the gripping surface 21 a and the winding surface 10 corresponding to the needle portion 3. It has been. When a cylindrical raw tire component formed on the molding drum 1 is gripped by the transfer 2, a through hole is formed in the sidewall rubber C1 by inserting the needle 3 into the sidewall rubber C1 and pressing it against the needle receiving recess 5. It is configured to be able to.

  The green tire molding method of the present embodiment includes a molding drum 1 having a winding surface 10 for winding a green tire constituent member including a sidewall rubber C1 to form a cylindrical shape, and a cylindrical shape molded into the molding drum 1. And a transfer 2 having a gripping surface 21a for gripping and transporting the outer peripheral surface of the raw tire constituent member. A plurality of needle portions 3 are provided on the gripping surface 21a, and a plurality of needles are provided on the winding surface 10. When a cylindrical raw tire constituent member formed on the forming drum 1 is gripped by the transfer 2 using a raw tire molding device in which the receiving recess 5 is provided corresponding to the needle portion 3, the needle portion 3 is secured to the side wall rubber. It includes a step of forming a through hole in the sidewall rubber C1 by piercing C1 and pressing it against the needle receiving recess 5.

  In this way, when the cylindrical raw tire constituent member (case C) molded on the molding drum 1 is gripped by the transfer 2 and conveyed to the next process, a through hole can be formed in the sidewall rubber C1. it can. Therefore, since the hole forming step is executed in the transporting step without providing a separate hole forming step, the raw tire molding apparatus and method that can suppress the influence on the lead time and are effective for suppressing air entry. Can be provided.

  In this embodiment, each needle part 3 is configured to be able to switch and move between a protruding position p4 protruding from the gripping surface 21a provided with the needle part 3 and a non-projecting position p3. Among them, a drive unit 4 is provided that can drive a part of the needle portions 3 independently of the other needle portions 3 from the non-projection position p3 to the projection position p4.

  According to this configuration, it is possible to change the density of the needle part 3 that pierces the sidewall rubber C1, or to select the needle part 3 to be driven according to the tire size, and it is possible to deal with other types of tires.

  In the present embodiment, each needle receiving recess 5 is configured to be movable from the support position p5 supporting the sidewall rubber C1 to the non-supporting position p6 by the pressing force of the needle portion 3, and the needle receiving recess 5 is not A biasing member 6 that biases the support position p6 toward the support position p5 is provided.

  According to this configuration, the through hole can be accurately formed in the sidewall rubber as compared with the fixed type.

  In the present embodiment, the plurality of needle portions 3 are provided on the transfer 2 side, the plurality of needle receiving recesses 5 are provided on the molding drum 1 side, and the needle portions 3 are on the tire width direction inner side from the tire width direction inner side. A through-hole is formed in the sidewall rubber C1 toward the side to be.

  Since it has a tapered shape, a through hole having a large diameter on the inner side in the tire width direction and a small diameter on the outer side in the tire width direction is formed, which is preferable from the viewpoint of closing the through hole by vulcanization.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not only by the above description of the embodiments but also by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

The structure employed in each of the above embodiments can be employed in any other embodiment. The specific configuration of each unit is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Molding drum 10 ... Winding surface 2 ... Transfer 21a ... Gripping surface 3 ... Needle part 4 ... Drive part 5 ... Needle receiving recessed part 6 ... Energizing member C1 ... Side wall rubber C ... Case (raw cylindrical shape) Tire components)
p3 ... non-projecting position p4 ... projecting position p5 ... support position p6 ... non-support position

Claims (5)

A forming drum having a winding surface for winding a green tire constituent member including a sidewall rubber into a cylindrical shape and a cylindrical raw tire constituent member formed on the forming drum by gripping and conveying the outer peripheral surface A transfer having a gripping surface for
A plurality of needle portions are provided on one of the gripping surface and the winding surface, and a plurality of needle receiving recesses are provided on the other of the gripping surface and the winding surface corresponding to the needle portions. When the cylindrical raw tire constituent member molded on the molding drum is gripped by the transfer, the needle portion is inserted into the sidewall rubber and pressed against the needle receiving recess to penetrate the sidewall rubber. A raw tire molding apparatus configured to form a hole.   Each of the needle portions is configured to be able to switch and move between a protruding position protruding from the gripping surface or the winding surface provided with the needle portion and a non-projecting position, and one of the plurality of needle portions. The raw tire molding device according to claim 1, wherein a drive unit capable of driving the needle part of the part from the non-projecting position to the projecting position independently of other needle parts is provided.   Each of the needle receiving recesses is configured to be movable from a support position supporting the sidewall rubber to an unsupported position by a pressing force of the needle part, and the needle receiving recess is moved from the non-supporting position to the support position. The raw tire shaping | molding apparatus of Claim 1 or 2 with which the urging member urged | biased toward is provided.   The plurality of needle portions are provided on the transfer side, the plurality of needle receiving recesses are provided on the molding drum side, and the needle portions are moved from the inner side in the tire width direction to the outer side in the tire width direction. The raw tire molding apparatus according to claim 1, wherein a through hole is formed in the sidewall rubber. A forming drum having a winding surface for winding a green tire constituent member including a sidewall rubber into a cylindrical shape and a cylindrical raw tire constituent member formed on the forming drum by gripping and conveying the outer peripheral surface A transfer surface having a gripping surface, and a plurality of needle portions are provided on one of the gripping surface and the winding surface, and a plurality of needle portions are provided on the other of the gripping surface and the winding surface. Using a raw tire molding device in which a needle receiving recess is provided corresponding to the needle portion,
When gripping the cylindrical raw tire constituent member formed on the molding drum with the transfer, the needle portion is inserted into the sidewall rubber and pressed against the needle receiving recess to form a through hole in the sidewall rubber. A green tire molding method including a forming step.

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