JP6390156B2 - Pneumatic tire manufacturing method and forming drum - Google Patents

Description

  The present invention relates to a method for manufacturing a pneumatic tire and a forming drum. More specifically, the present invention relates to a step of forming a green tire by bonding a belt member to a band member using the forming drum formed with the band member, and the green tire. The present invention relates to a method for manufacturing a pneumatic tire excellent in productivity and capable of performing a vulcanizing step, and a molding drum thereof.

  Conventionally, in a manufacturing process of a pneumatic tire, for example, a band member including an inner liner and a carcass material and a belt member including a belt material are separately formed and are inflated by a shaping drum. Are joined to form a green tire. Thereafter, the green tire is removed from the shaping drum and installed in a vulcanization mold attached to a vulcanizer, and vulcanization is performed using a vulcanization bladder inserted inside the green tire.

  As another method, there has been proposed a method and an apparatus for manufacturing a pneumatic tire using a forming drum having a bladder at the center in the drum axial direction (see Patent Document 1). In the method described in Patent Document 1, the band member wound around the outer peripheral surface of the forming drum is expanded and deformed by being expanded by a bladder provided in the forming drum. A belt member is joined to the outer peripheral surface of the band member to form a green tire. Thereafter, the molding drum is transferred to a vulcanizing apparatus together with the green tire and installed in a vulcanization mold, and the green tire is vulcanized using a bladder provided in the molding drum. In this method, the step of removing the molded green tire from the molding drum can be omitted.

  By the way, since this molding drum used for molding a green tire is composed only of a rubber bladder in the drum axial center, it cannot be molded by winding a member around the drum axial center. Therefore, in the method described in Patent Document 1, the band member is separately formed into a cylindrical shape using a band forming drum, and then transferred to the forming drum (see paragraphs 0013 and 0014 of Patent Document 1). That is, there are a drum for forming the band member and a drum for forming the green tire, and a process using each drum is required. Therefore, there is room for improvement in improving tire productivity.

JP 2012-86487 A

  An object of the present invention is excellent in productivity by using a forming drum formed with a band member to join a belt member to the band member to form a green tire and vulcanize the green tire. It is in providing the manufacturing method of a pneumatic tire, and its molding drum.

  In order to achieve the above object, the method for producing a pneumatic tire according to the present invention includes a green tire molded on the outer peripheral surface of a molding drum formed of a cylindrical bladder in the center in the drum axial direction, and vulcanized together with the molding drum. In a method for manufacturing a pneumatic tire in which the green tire is vulcanized by inflating the bladder in a mold attached to the vulcanizing apparatus, the support is provided on the inner peripheral side of the bladder. A band member including an inner liner that is a constituent member of the green tire is wound while being supported by the support body with the bladder interposed therebetween, and is formed into a cylindrical shape, and then the drum of the bladder The both ends of the axial direction are moved close to each other in the drum axial direction to contract the molding drum in the drum axial direction and the bladder is expanded to the outer peripheral side. The belt member comprising a belt member a component of Ya, in a state where no supported by said support, joined to the outer peripheral side of the band member formed into a cylindrical shape, characterized in that molding the green tire.

  The forming drum of the pneumatic tire of the present invention is constituted by a cylindrical bladder in the center in the drum axial direction, and is transferred to a vulcanizing apparatus together with a green tire molded on the outer peripheral surface of the bladder, and this vulcanizing A pneumatic tire forming drum for inflating the bladder in a mold attached to an apparatus to vulcanize the green tire, and having a support disposed inside the bladder, the structure of the green tire A belt member including an inner liner, which is a member, is wound while being supported by the support in a state where the bladder is interposed, and is formed into a cylindrical shape, and includes a belt member including a belt material which is a constituent member of the green tire. The both ends of the bladder in the drum axial direction are moved close to each other in the drum axial direction to contract in the drum axial direction, and the bladder is expanded to the outer peripheral side. By, in a state that it is not supported by the support, the green tire is bonded to the outer peripheral side of the band member molded into a cylindrical shape, characterized in that a structure to be formed.

  According to the present invention, the support is disposed on the inner side of the bladder that forms the drum axial center of the forming drum. Therefore, the band member can be wound into a cylindrical shape while being supported by the support body with the bladder interposed. Next, both ends of the bladder in the drum axis direction are moved close to each other in the drum axis direction to contract in the drum axis direction, and the bladder is expanded to the outer peripheral side, and the belt member is formed into a cylindrical shape without being supported by the support. The green tire can be molded by bonding to the outer peripheral side of the band member. Next, the pneumatic tire can be manufactured by transferring the green tire together with the molding drum to a vulcanizing apparatus and inflating the bladder in a mold attached to the vulcanizing apparatus to vulcanize the green tire.

  Therefore, a band forming drum used only for forming the band member into a cylindrical shape is not necessary, and there is no need to transfer the band member formed into a cylindrical shape to another forming drum. As described above, in the present invention, the molding drum for molding the band member can be used in the green tire molding process and the green tire vulcanization process for joining the band member and the belt member, so that the productivity is excellent. .

It is explanatory drawing which illustrates a part of forming drum of the pneumatic tire of the present invention in section view. It is a front view which illustrates the support body of FIG. It is explanatory drawing which illustrates the process which expands the bladder of FIG. 1 and joins a belt member to the outer peripheral surface of a band member by making a part of molding drum into a cross sectional view. It is a front view which illustrates the support body of FIG. It is explanatory drawing which illustrates the process of vulcanizing a green tire by a semi-sectional view. It is a front view which shows the modification of a support body.

  Hereinafter, the manufacturing method and molding drum of the pneumatic tire of this invention are demonstrated based on embodiment shown in the figure.

  A pneumatic tire molding drum 1 of the present invention illustrated in FIGS. 1 and 2 includes a cylindrical bladder 2 at the center in the drum axial direction, and includes a support 5 disposed inside the bladder 2. Yes. Both end portions in the drum axial direction of the forming drum 1 are annular metal side drum portions 3. A cylindrical auxiliary drum 4 is detachably attached to the outer side of each side drum portion 3 in the drum axial direction. The opposing side drum portion 3 moves with the auxiliary drum 4 so as to approach and separate in the drum axial direction. The drum axis direction is the left-right direction in FIGS.

  The support body 5 of this embodiment is composed of a plurality of receiving plates 5 a that face each other in the drum axial direction of the forming drum 1. One end portion of each receiving plate 5a is attached to the side drum portion 3, and the other end portion is a free end. The receiving plates 5a opposed to each other in the drum axial direction are offset in the drum circumferential direction and arranged in a nested manner.

  As illustrated in FIG. 3 and FIG. 4, when the opposing side drum portions 3 move close to each other in the drum axis direction, the receiving plates 5 a attached to the respective side drum portions 3 face each other in the drum axis direction. The side receiving plate 5a is set so as to enter a gap between adjacent drum circumferential directions. Therefore, even if the opposing side drum portions 3 are moved close to each other in the drum axial direction, the receiving drums 5a attached to the respective side drum portions 3 do not interfere with each other, and the molding drum 1 can be smoothly moved in the drum axial direction. Can be shrunk.

  Hereinafter, an example of the procedure of the manufacturing method of the pneumatic tire of the present invention will be described.

  First, as illustrated in FIG. 1, the side drum portion 3 of the forming drum 1 is fixed at a predetermined position in the drum axial direction, and the bladder 2 is set in a neutral state in which the bladder 2 is not expanded, and the outer peripheral surface of the bladder 2 is generally set in a sectional view. Set the drum parallel to the drum axis. The receiving plates 5a fixed to the side drum portions 3 opposed to each other in the drum axial direction are in positions that slightly overlap in the drum axial direction. The outer peripheral surface of the receiving plate 5a is in a state parallel to the drum axis direction in a sectional view, and the outer peripheral surface of the receiving plate 5a and the peripheral surface of the bladder 2 are in a substantially parallel state in a sectional view.

  A belt-shaped band member 8 including an inner liner 9 is wound around the molding drum 1 to form a cylindrical shape. The band member 8 is configured by laminating an inner liner 9, a carcass material 10 and the like in order from the inner peripheral surface side. The innermost peripheral side of both end portions in the drum axial direction of the band member 8 is constituted by side rubbers 11. While the molding drum 1 is rotated, the band-shaped band member 8 is wound while being supported from the inner peripheral side by the receiving plate 5a with the bladder 2 interposed, and is formed into a cylindrical shape.

  A pair of bead portions 12 are arranged on the outer peripheral surfaces of both end portions in the drum axial direction of the band member 8 formed into a cylindrical shape. The bead portion 12 is composed of an annular bead and a bead filler, and temporarily presses the inner peripheral surface of the bead portion 12 to the outer peripheral surface of the band member 8.

  Next, as illustrated in FIGS. 3 and 4, the side drum portions 3 facing in the drum axis direction are moved close to each other in the drum axis direction, whereby both ends of the bladder 2 in the drum axis direction are moved close to each other in the drum axis direction. . As a result, the molding drum 1 is contracted in the drum axis direction, and the internal pressure of the bladder 2 is increased to expand the outer periphery.

  The band member 8 bulges and deforms along the outer peripheral surface of the expanded bladder 2. The bladder 2 is separated from the receiving plate 5a by expanding. With the bladder 2 inflated in this manner, the belt member 13 is joined to the outer peripheral side of the band member 8 formed into a cylindrical shape without being supported by the receiving plate 5a. The belt member 13 includes a belt material 14 and a tread rubber 15 laminated on the outside thereof. When the band member 8 is formed into a cylindrical shape, the portion of the band member 8 that protrudes outward from the bead portion 12 in the drum axis direction is turned up by a known turn-up mechanism and joined to the opposite band member 8 portion. Then, the green tire G is formed.

  For example, the belt member 13 formed in a cylindrical shape is arranged on the outer peripheral side of the band member 8 formed in a cylindrical shape on the outer peripheral surface of the forming drum 1 and is put in an extrapolated state. At this time, the bladder 2 which has been in a neutral state is expanded to the outer peripheral side. Thereby, the outer peripheral surface of the band member 8 bulged and deformed by the expansion of the bladder 2 and the inner peripheral surface of the belt member 13 are joined. The outer peripheral surface of the belt member 13 joined to the band member 8 is pressed by a pressing roller or the like to join both together more firmly.

  Next, the molding drum 1 is separated from the auxiliary drum 4, and the green tire G molded on the outer peripheral surface of the molding drum 1 is transferred to the vulcanizer 6 together with the molding drum 1 and installed. In this vulcanizing device 6, as illustrated in FIG. 5, the forming drum 1 and the green tire G are arranged in a mold 7 attached to the vulcanizing device 6. Then, the mold 7 is closed, the bladder 2 is further expanded, and the green tire G is vulcanized. That is, the bladder 2 used for forming the green tire G is used as the vulcanization bladder. The pneumatic tire T is completed by vulcanizing for a predetermined time under predetermined conditions.

  As described above, since the support body 5 is disposed inside the bladder 2 provided in the forming drum 1, the band member 8 is wound while being supported by the support body 5 with the bladder 2 interposed therebetween, and is cylindrical. Can be molded. The green tire G can be subsequently formed by joining the band member 8 and the belt member 13 using the forming drum 1. The molded green tire G can be installed in the vulcanizing device 6 together with the molding drum 1 without being removed from the molding drum 1. The bladder 2 used in the green tire G forming process can be used as a vulcanizing bladder in the vulcanizing process.

  Therefore, the band forming drum conventionally used only for forming the band member 8 into a cylindrical shape is not necessary. Further, it is not necessary to transfer the band member 8 formed into a cylindrical shape to another forming drum. Along with this, the space required for work can be made compact. In this way, the molding drum 1 formed with the band member 8 is used for the green tire G molding process and the green tire G vulcanization process for joining the band member 8 and the belt member 13, thereby shortening the working time. Can be achieved, and excellent productivity can be obtained.

  The support 5 can also have a structure illustrated in FIG. The support 5 is extended to both end portions (side drum portion 3) in the drum axial direction of the forming drum 1, and is provided with a plurality of telescopic rods 5b disposed at intervals in the drum circumferential direction, and the telescopic rods 5b. It is comprised with the some annular body 5c hold | maintained at intervals in the drum axial direction.

  Each telescopic rod 5b is formed by telescopically forming a plurality of rod portions having different diameters. Both ends of the telescopic rod 5b in the drum axis direction are attached to the opposing side drum units 3, and the telescopic rod 5b can be expanded and contracted in the drum axial direction. The annular body 5c is engaged with the outer peripheral surface of the telescopic rod 5b, and can slide in the rod longitudinal direction.

  In this support body 5, the band-shaped band member 8 can be wound into a tubular shape while being supported by the telescopic rod 5 b and the annular body 5 c. When the opposing side drum portions 3 move close to each other in the drum axis direction, the respective telescopic rods 5b contract. Therefore, when the belt member 13 is joined by bulging and deforming the band member 8, the forming drum 1 can be smoothly contracted in the drum axial direction.

  The support 5 can also be provided detachably with respect to the forming drum 1 (side drum portion 3). In this structure, when the green tire G is vulcanized, the support 5 can be detached from the side drum portion 3. As a result, the green tire G can be vulcanized without the support 5 inside the bladder 2.

  The present invention can be applied to the manufacture of various types of pneumatic tires, including pneumatic tires for passenger cars. For example, a run flat tire having a thick side portion as compared with a normal pneumatic tire has a longer vulcanization time and the like, and thus needs to improve productivity. Therefore, when the present invention is applied, a great effect can be expected in improving productivity.

DESCRIPTION OF SYMBOLS 1 Molding drum 2 Bladder 3 Side drum part 4 Auxiliary drum 5 Support body 5a Receiving plate 5b Telescopic rod 5c Annular body 6 Vulcanizing device 7 Mold 8 Band member 9 Inner liner 10 Carcass material 11 Side rubber 12 Bead part 13 Belt member 14 Belt material 15 Tread rubber G Green tire T Pneumatic tire

Claims (8)

A green tire molded on the outer peripheral surface of a molding drum composed of a cylindrical bladder in the center in the drum axial direction is transferred to the vulcanizer along with the molding drum and installed, and the mold attached to the vulcanizer In the method of manufacturing a pneumatic tire in which the bladder is inflated to vulcanize the green tire,
A support body is disposed on the inner peripheral side of the bladder, and a band member including an inner liner, which is a constituent member of the green tire, is wound while being supported by the support body with the bladder interposed therebetween to form a cylindrical shape. Next, both ends of the bladder in the drum axis direction are moved close to each other in the drum axis direction, the molding drum is contracted in the drum axis direction, and the bladder is expanded to the outer peripheral side. A method of manufacturing a pneumatic tire, comprising forming a green tire by joining a belt member including a belt material to an outer peripheral side of the band member formed into a cylindrical shape without being supported by the support. .   The support is composed of a plurality of receiving plates that are fixed at both ends in the drum axial direction of the forming drum and face each other in the drum axial direction, and the opposing receiving plates are offset in the drum circumferential direction. 2. The air according to claim 1, wherein when the band member and the belt member are joined in a nested manner, the opposing receiving plates are moved close to each other in the drum axial direction to contract the forming drum in the drum axial direction. A method for manufacturing a tire.   A plurality of telescopic rods that extend over both ends of the forming drum in the drum axial direction and are spaced apart in the drum circumferential direction and extendable in the drum axial direction, and the telescopic rods are connected to the drum shaft. A plurality of annular bodies held at intervals in a direction, and when the band member and the belt member are joined, the forming rod is contracted in the drum axis direction by contracting these telescopic rods. A method for producing a pneumatic tire according to 1.   The pneumatic tire according to any one of claims 1 to 3, wherein the support is detachably attached to the molding drum, and the support is removed from the molding drum when the green tire is vulcanized. Production method. The drum axial center part is constituted by a cylindrical bladder, and is transferred to a vulcanizing device together with a green tire molded on the outer peripheral surface of the bladder and installed in the mold attached to the vulcanizing device. In a pneumatic tire molding drum for inflating the vulcanized green tire,
A band member including a support member disposed inside the bladder and including an inner liner which is a constituent member of the green tire is wound while being supported by the support member with the bladder interposed therebetween. A belt member including a belt material, which is a component of the green tire, moves both ends of the bladder in the drum axial direction close to each other in the drum axial direction, and contracts the bladder in the outer circumferential side. A pneumatic tire having a structure in which the green tire is molded by being joined to an outer peripheral side of the cylindrically shaped band member in a state where the green tire is not supported by the support body . Molding drum.   The support is composed of a plurality of receiving plates that are fixed at both ends in the drum axial direction and are opposed to each other in the drum axial direction, and these opposed receiving plates are offset in the drum circumferential direction to be nested. The pneumatic drum forming drum according to claim 5, wherein the pneumatic drum is configured to be capable of expanding and contracting in the drum axis direction by being disposed in the drum and moving in the drum axis direction.   The support body is spanned between both ends in the drum axial direction and arranged at intervals in the drum circumferential direction, and a plurality of expansion rods that can expand and contract in the drum axis direction, and the expansion rods are spaced in the drum axis direction. The pneumatic tire forming drum according to claim 5, wherein the pneumatic tire forming drum is configured to include a plurality of annular bodies that are opened and held and extend and contract in a drum axial direction by expansion and contraction of the expansion and contraction rod.   The forming drum for a pneumatic tire according to any one of claims 5 to 7, wherein the support is detachably provided, and the support is removed when the green tire is vulcanized.

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