JP2008213289A - Inner mold for manufacturing tire and tire manufacturing method using inner mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively restrain flashes and bears (recesses) from being generated on the outside surface of a pneumatic tire (product tire). <P>SOLUTION: When the unvulcanized tire 12 is molded with rubber ribbons and the like arranged on the outside of the inner mold 11, the gage of the unvulcanized tire 12 sometimes becomes uneven. When the inner mold 11 is used in which the filling fluid 58 is filled in the filling space 55 between the bladder 54 secured on the inner mold main body 40 so as for the outside edge to be sealed tightly and the above inner mold main body 40, at the time of the vulcanization, the bladder 54 at the part having a thick gage is pushed down toward the inner mold main body 40 side to deform as it sags while, at the part having a thin gage, the bladder 54 swells/deforms so as to stick closely to the inner surface of the unvulcanized tire 12. This effectively restrains the situation of the flashes and recesses being generated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

    The present invention relates to an inner mold for manufacturing a tire used when manufacturing a pneumatic tire and a tire manufacturing method using the inner mold.

As conventional tire manufacturing inner molds and tire manufacturing methods using the inner molds, for example, those described in Patent Documents 1 and 2 below are known.
Japanese Patent Laid-Open No. 11-034062 JP 2006-297605 A

  First, Patent Document 1 discloses a tire manufacturing inner mold that is entirely made of a rigid body, such as an aluminum alloy, and whose outer surface is substantially the same shape as the inner surface of a product tire. After forming the unvulcanized tire by arranging tire constituent members one after another on the outer side of the inner mold for tire manufacture as described above, an outer mold for tire vulcanization made of a rigid body is formed on the outer side of the unvulcanized tire. The unvulcanized tire is sealed and stored in a vulcanization space formed between the inner mold and the outer mold, and then the vulcanized medium is supplied to the inner mold and the outer mold to remove the unvulcanized tire. A pneumatic tire manufactured by vulcanization is disclosed.

    Here, when molding the above-mentioned unvulcanized tire on the outside of the inner mold, rubberized cords, rubber ribbons, etc. are knitted on the outside of the inner mold or wound spirally. Pull cords, rubber ribbons, etc. are soft, so it is difficult to knitting or winding them exactly as designed. As a result, the gauge of the unvulcanized tire is thicker or thinner than the design value depending on the location, and uneven. It may become.

  And when such an unvulcanized tire is vulcanized using the inner mold as described above, both the inner mold and the outer mold are composed of a rigid body, so that the outer mold is configured for the thick gauge part. Excess rubber protruded into the gap between the upper and lower molds and the sector mold to generate burrs. As a result, there was a problem that it was necessary to remove the burrs from the vulcanized pneumatic tire. On the other hand, with respect to the thin gauge portion, since air remains between the mold and the tire, there is a problem in that a dent (bear) having a poor appearance is generated on the outer surface of the pneumatic tire.

  An object of the present invention is to provide a tire manufacturing inner mold and a tire manufacturing method using the inner mold that can effectively suppress burrs and dents (bearings) generated on the outer surface of a pneumatic tire. To do.

    Such an object is firstly provided to cover the inner mold body, which is made of a rigid body and has a coating region and an exposed region on the outer surface, and to cover the coating region of the inner mold body. A bendable bladder that is locked in a sealed state and forms a filling space with the inner mold body, a filling fluid composed of a liquid filled in the filling space, and a bladder that is housed in the filling space, The outer surface shape of the bladder is regulated by urging it away from the main body, and in addition to the exposed area of the inner mold main body, a plurality of elastic shapes that make the outer surface of the bladder substantially the same shape as the inner surface of the product tire Can be achieved by an inner mold for manufacturing a tire with a body,

  Second, a step of forming tire constituent members one after another on the outer side of the aforementioned inner mold for manufacturing a tire to form an unvulcanized tire, and an outer die for vulcanizing the tire on the outer side of the unvulcanized tire A process of hermetically storing the unvulcanized tire in a vulcanization space formed between the inner mold and the outer mold, and vulcanizing the unvulcanized tire by supplying a vulcanized medium to the inner mold and the outer mold. It can achieve by the tire manufacturing method using the inner mold for tire manufacture provided with the process to do.

  In the present invention, the filling space between the inner mold body and the bladder whose outer edge is locked to the inner mold body in a sealed state is filled with a filling fluid made of liquid, and a plurality of elastic bodies are placed in the filling space. Since the outer surface of the bladder is defined and the outer surface of the bladder is made substantially the same shape as the inner surface of the product tire, a rubberized cord and a rubber ribbon are knitted on the outer side of the inner mold or spirally wound. When forming an unvulcanized tire by turning, the outer surface of the bladder does not deform with an appropriate strength, and as a result, an unvulcanized tire having a desired shape can be formed without any problem.

  Here, since the rubberized cord and rubber ribbon described above are soft, the gauge of the unvulcanized tire may become uneven depending on the location. When the inner and outer molds are vulcanized by storing them in the sulfur space, the bladder is pushed into the inner mold main body and deformed so that it is recessed in the thick gauge area, while the bladder is not added to the thin gauge area. Swelling deformation is performed so as to be in close contact with the inner surface of the vulcanized tire, thereby effectively suppressing the occurrence of burrs and dents (bears). Such a deformation of the bladder can be performed without any problem because the bladder can be bent and the filling fluid can flow through the filling space almost without resistance.

  According to the second aspect of the present invention, when the unvulcanized tire is molded, the filling fluid (magnetic fluid) becomes close to a solid and the form is stabilized, whereby the dimensions of the molded unvulcanized tire are increased. Accuracy and the like can be further improved. Furthermore, if constituted as in claim 3, the shape of the bladder can be stabilized for a long period of time while sufficiently suppressing the generation of burrs. In addition, if configured as described in claim 4, the inner mold can be simplified in structure, and the manufacturing cost can be reduced.

Embodiment 1 of the present invention will be described below with reference to the drawings.
In FIG. 1, reference numeral 11 denotes an inner mold for manufacturing a tire having a donut shape as a whole, and an unvulcanized tire 12 is mounted on the outside of the inner mold 11. Tire constituent members can be arranged around 11 around one another, for example, by knitting rubberized cords or rubber ribbons or by winding them spirally.

  Here, the unvulcanized tire 12 described above has a carcass layer 14 that extends in a toroidal shape in which both ends are sandwiched from both sides by a pair of bead segments 13 and a steel cord or the like is embedded therein, and the carcass layer 14 The belt layer 16 is composed of a plurality of belt plies 15 in which steel cords and the like that are inclined with respect to the tire equator S are embedded, and the belt layer 16 is disposed on the radially outer side of the belt layer 16. And a tread 17 made of rubber.

  The inner mold 11 is composed of a rigid body such as steel or aluminum alloy, and has a core 21 having a donut shape as a whole. The core 21 includes a plurality of core segments 22 in the circumferential direction, in this case, ten arc-shaped core segments 22 in the circumferential direction. It arrange | positions and it comprises by contacting the circumferential direction end surfaces. These core segments 22 are composed of two types of segments: a fan-shaped segment having a fan-shaped side surface and a chevron-shaped mountain segment, and these fan-shaped and mountain-shaped core segments are alternately arranged in the circumferential direction. In addition, in this invention, you may comprise a core by arrange | positioning alternately a sector segment and the rectangular segment with which the circumferential direction both end surfaces are parallel.

  Through holes 25 extending in the circumferential direction are formed in each core segment 22, and these through holes 25 are opened at both ends in the circumferential direction of the core segment 22. As a result, when the core segment 22 is assembled in the state of close contact in the circumferential direction as described above, all the through holes 25 communicate with each other in a ring shape, and a continuous ring-shaped medium chamber 26 is formed inside the core 21. The medium chamber 26 is supplied with a high-temperature and high-pressure vulcanization medium, for example, steam, when the unvulcanized tire 12 is vulcanized.

  Arc-shaped grooves 29 extending in the circumferential direction are respectively formed on both side surfaces in the axial direction at the radially inner end portions of the respective core segments 22, and these arc-shaped grooves 29 are continuous when the core 21 is formed. Thus, the annular grooves 30 are formed on both side surfaces of the core 21 in the axial direction. 31 is a substantially cylindrical one side fastening body having an annular protrusion 32 at one end in the axial direction, and this one side fastening body 31 is inserted from one side while maintaining a coaxial relationship in the central space of the core 21, By inserting the annular protrusion 32 into the annular groove 30 on one side, the annular protrusion 32 is locked to the radially inner end portion on one side of the core 21.

  35 is a substantially cylindrical other side fastening body having an annular protrusion 36 at the other end in the axial direction, and is formed on the outer circumference of the other side fastening body 35 on the outer circumference of the one side fastening body 31. A female screw 38 that is screwed onto the male screw 37 is formed. When the male screw 37 and the female screw 38 are screwed together, the one-side and other-side fastening bodies 31 and 35 fasten the core 21 from both sides and hold the core 21 in a specified shape. Here, the one-side and other-side fastening bodies 31 and 35 described above constitute a substantially cylindrical fastening body 39 that forms a donut-shaped core 21 by fastening the core segment 22 as a whole. 21 and the fastening body 39 as a whole constitute an inner mold body 40 made of a rigid body.

  In addition, shallow shallow grooves 43 extending in the circumferential direction are formed on the radially outer surface of each core segment 22 described above, and when these shallow grooves 43 are assembled with the core segments 22 in close contact with each other in the circumferential direction, A circumferential groove 44 extending in the circumferential direction over the entire circumference of the mold body 40 is formed. The inner die body 40 has, on its outer surface, a covering region 45 in which a circumferential groove 44 is formed, and the bead toe 47 of the unvulcanized tire 12 from both axial ends of the covering region 45 toward the annular groove 30. And a pair of exposed regions 46 extending.

  51 is arranged to cover the shallow groove 43 of each core segment 22 from the outside, for example, a plurality of (same number as the core segment 22) bendable bladder segments composed of rubberized cord cloth or rubber sheet, The outer edge (four sides) of the bladder segment 51 is locked to the core segment 22 at the outer edge of the shallow groove 43 by a lock block 52 in a sealed state.

  As a result, an arcuate space 53 surrounded by the shallow groove 43 and the bladder segment 51 of each core segment 22 is defined in a sealed state. The plurality of bladder segments 51 described above are provided so as to cover the covering region 45 of the inner mold body 40 as a whole, and constitute a bendable bladder 54 whose outer edge is locked to the inner mold body 40 in a sealed state, Between the bladder 54 and the inner mold main body 40, a filling space 55 composed of all the arc-shaped spaces 53 described above is formed.

  The filling space 55 is filled with a filling fluid 58 made of a liquid so as to fill the entire space. As the filling fluid 58, for example, water, oil, liquid metal, or the like can be used. Further, a plurality of leaf springs 59 as elastic bodies are accommodated in the filling space 55 (arc-shaped space 53) so as to be distributed almost uniformly, and these leaf springs 59 connect the bladder 54 to the inner mold body 40, here The outer surface of the bladder 54 is biased so as to be separated from the bottom surface of the shallow groove 43 formed in the inner die main body 40, and the outer surface shape of the bladder 54 is defined to be substantially the same shape as a part of the inner surface of the product tire. Here, since the outer surface of the exposed region 46 is formed in advance in substantially the same shape as a part of the inner surface of the product tire, the outer surface of the bladder 54 and the outer surface of the exposed region 46 are continuously produced. It has substantially the same shape as the inner surface of the tire.

  As described above, the filling space 55 between the bladder 54 whose outer edge is locked to the inner mold body 40 in a sealed state and the inner mold body 40 is filled with the filling fluid 58 made of liquid, and the filling space A plurality of leaf springs 59 are accommodated in 55 to define the outer surface shape of the bladder 54, and in addition to the exposed region 46 of the inner mold main body 40, the outer surface of the bladder 54 is made substantially the same shape as the inner surface of the product tire. Therefore, when the unvulcanized tire 12 is formed by knitting rubberized cords or rubber ribbons on the outside of the inner mold 11 or winding it spirally, the outer surface of the inner mold 11, especially the bladder 54, has an appropriate strength. As a result, the unvulcanized tire 12 having a desired shape can be formed without any problem.

  In this embodiment, the leaf spring 59 is used as the elastic body. However, when such a leaf spring 59 is used, the structure of the inner mold 11 is simplified and the manufacturing cost can be reduced. A compression spring or a rubber block may be used as the elastic body. Further, in this embodiment, a magnetic fluid is used as the above-described filling fluid 58, and both core ends (N or S poles) are formed on the bottom surfaces of the shallow grooves 43 (circumferential grooves 44) in each core segment 22 (core 21). A plurality of electromagnets 62 having a U-shape exposed to the surface are embedded almost uniformly.

  Here, the ferrofluid is a high-density and stable liquid in which liquid particles of a ferromagnetic material having a size of several to several tens of nanometers are densely covered with surfactant molecules. As the above-mentioned liquid, water, alkylnaphthalene, perfluoropolyether or the like is used. As a result, when the aforementioned electromagnet 62 is not energized and does not generate a magnetic field, the magnetic fluid behaves as a normal liquid, but when the unvulcanized tire 12 is molded outside the inner mold 11, the electromagnet 62 A current is applied to generate a magnetic field around the electromagnet 62.

  As a result, the magnetic field lines coming out of the N pole of the electromagnet 62 pass through the magnetic fluid in the filling space 55, the steel cord in the carcass layer 14, the belt layer 16 and the magnetic fluid in the filling space 55 one after another, At this time, since the magnetic particles in the magnetic fluid are arranged along the lines of magnetic force, the magnetic fluid is close to a solid and the form is stabilized. Thereby, the dimensional accuracy and the like of the molded unvulcanized tire 12 can be further improved.

  In this embodiment, the U-shaped electromagnet 62 is embedded in the core segment 22 (core 21). However, in the present invention, a cylindrical electromagnet is embedded in the core and one of the magnetic poles is disposed in the core (shallow). The outer surface of the groove is exposed, and when the unvulcanized tire is molded, the electromagnet is energized to cause a spike phenomenon in the magnetic fluid to stabilize the form of the magnetic fluid, or the same cylindrical shape as described above is used. While the electromagnet is embedded in the core, an arc-shaped electromagnet that extends parallel to the inner mold is placed outside the inner mold when molding the unvulcanized tire, and a magnetic field is generated between the two electromagnets so that the magnetic particles of the magnetic fluid are drawn to the magnetic field lines. The magnetic fluid may be stabilized in shape.

  Here, the viscosity of the magnetic fluid at 20 ° C. is preferably in the range of 100 to 600 mPa · sec. The reason is that if the viscosity is less than 100 mPa · sec, the shape of the bladder 54 may change and the shape of the unvulcanized tire 12 may become unstable when used for a long period of time as will be described later.・ If it exceeds sec, the amount of burrs generated during vulcanization will increase, but if it is within the above range, the shape of the bladder 54 can be stabilized for a long time while sufficiently suppressing the generation of burrs. Because it can.

  In FIGS. 1 and 2, 66 is a horizontal lower base. On the lower base 66, a lower platen 67 to which a high-temperature and high-pressure vulcanizing medium is supplied is fixed. On the lower platen 67, a lower mold 68 for attaching the lower sidewall portion W and the lower bead portion B of the unvulcanized tire 12 is attached. 70 is an upper base installed above the lower base 66, and an upper platen 71 similar to the lower platen 67 is fixed to the lower surface. The upper base 70 is raised and lowered by a cylinder (not shown), Approach and leave the lower base 66. An upper plate 72 connected to the tip of a piston rod 69 of a cylinder (not shown) is installed directly below the upper base 70. The upper plate 72 is moved up and down separately from the upper base 70 by the operation of the cylinder. can do.

  74 is an upper mold that is fixed to the lower surface of the upper plate 72 and moves up and down together with the upper plate 72 to approach and separate from the lower mold 68. The upper mold 74 is the upper side of the unvulcanized tire 12 during vulcanization. The wall portion W and the upper bead portion B are molded. Reference numeral 75 denotes an outer ring installed so as to surround the upper plate 72 from the outside in the radial direction. The upper end of the outer ring 75 is fixed to the outer end of the upper base 70 in the radial direction. The inner periphery 75a of the outer ring 75 is an inclined surface (a part of a conical surface) that expands downward.

  77 is a holder having a plurality of arcs arranged side by side in the circumferential direction, and these holders 77 are supported at their upper ends by an upper plate 72 radially outward from the upper mold 74 so as to be movable in the radial direction. The vulcanization medium is supplied inside during vulcanization. Further, arc-shaped sector molds 78 are attached to the inner circumference of each holder 77, and these sector molds 78 mainly mold the tread portion T of the unvulcanized tire 12 during vulcanization.

  An inclined surface (a part of a conical surface) having the same gradient as the inner periphery 75a of the outer ring 75 is formed on the outer periphery 77a of each holder 77. The inner periphery 75a and the outer periphery 77a are slid while being connected by a joint. It is movably engaged. As a result, when the outer ring 75 moves up and down with respect to the upper plate 72, the holder 77 and the sector mold 78 move synchronously in the radial direction by the wedge action of the inner periphery 75a and the outer periphery 77a while being supported by the upper plate 72. .

  As described above, the upper molds 68 and 74 and all the sector molds 78 are made of a rigid body as a whole, and constitute an inner mold 11 and an outer mold 79 for tire vulcanization 79 arranged outside the unvulcanized tire 12 during vulcanization. The outer mold 79 molds the outer surface of the unvulcanized tire 12. In this embodiment, the outer mold 79 is composed of the upper mold 68, 74 and the sector mold 78 divided into three parts, but may be composed of the lower mold divided into two parts. .

  Then, the inner mold 11 on which the unvulcanized tire 12 is mounted is placed horizontally on the lower mold 68, and then the upper mold 72 is lowered by lowering the upper plate 72 and the upper base 70. When the upper base 70 is continuously lowered to the lower limit after being brought into contact with the upper sidewall portion W of the tire 12, all the sector molds 78 are pushed by the outer ring 75 and moved to the inner limit in the radial direction. As a result, the adjacent sector molds 78 come into close contact with each other to form a continuous ring shape.

  At this time, the vulcanizing mold 80 including the inner mold 11 and the outer mold 79 is closed, and a vulcanized space 82 for hermetically storing the unvulcanized tire 12 is formed between the inner mold 11 and the outer mold 79. The unvulcanized tire 12 thus hermetically stored in the vulcanization space 82 is supplied with a high-temperature, high-pressure vulcanization medium to the outer mold 79 and the inner mold 11 (medium chamber 26), so that the inner mold 11 And it is vulcanized while being surrounded by the outer mold 79.

Next, the operation of the first embodiment will be described.
When molding the unvulcanized tire 12 on the outside of the inner mold 11, while the inner mold 11 is rotated around a horizontal axis, a tire component such as a rubberized cord or a rubber ribbon is provided around the inner mold 11. Knitting or winding in a spiral. At this time, in the covering region 45, the filling space 55 between the inner mold main body 40 and the bladder 54 is filled with the filling fluid 58 made of liquid, so the bladder 54 may be easily deformed by an external force, In this embodiment, since a plurality of leaf springs 59 are accommodated in the filling space 55, the outer surface shape of the bladder 54 is substantially the same shape as a part of the inner surface of the product tire by these leaf springs 59. It is prescribed that

  Moreover, when the unvulcanized tire 12 is molded as described above, a magnetic field is generated by energizing the electromagnet 62, whereby the magnetic particles of the filling fluid 58 made of a magnetic fluid are arranged along the lines of magnetic force. As a result, the magnetic fluid becomes close to a solid and the form of the filling fluid 58 is stabilized, thereby further improving the dimensional accuracy and the like of the molded unvulcanized tire 12. In this way, an unvulcanized tire 12 having a desired shape is formed on the outer side of the inner mold 11, but the above-mentioned rubberized cord and rubber ribbon are soft, so the gauge of the unvulcanized tire 12 is a design value depending on the location. Often thicker or thinner.

  Next, after the inner mold 11 on which the unvulcanized tire 12 is mounted is placed horizontally on the lower mold 68, the upper plate 72 and the upper base 70 are lowered and the upper mold 74 is uncured. When the upper base 70 is continuously lowered to the lowering limit, all the sector molds 78 are pushed by the outer ring 75 and moved to the inner limit in the radial direction. As a result, the adjacent sector molds 78 are brought into close contact with each other to form a continuous ring shape.

  At this time, the vulcanizing mold 80 including the inner mold 11 and the outer mold 79 is closed, and the unvulcanized tire 12 is hermetically stored in the vulcanized space 82 formed between the inner mold 11 and the outer mold 79. . The unvulcanized tire 12 thus hermetically stored in the vulcanization space 82 is supplied with a high-temperature, high-pressure vulcanization medium to the outer mold 79 and the inner mold 11 (medium chamber 26), so that the inner mold 11 And it is vulcanized while being surrounded by the outer mold 79.

  Here, even if the gauge of the unvulcanized tire 12 is not uniform as described above, the bladder 54 and the leaf spring 59 are pushed into the inner mold main body 40 side and deformed so as to be recessed with respect to the thick part of the gauge, On the other hand, the bladder 54 is bulging and deforming so that the gauge 54 is in close contact with the inner surface of the unvulcanized tire 12, thereby generating burrs and dents (bears) on the outer surface of the pneumatic tire (product tire). The situation to do is suppressed effectively. Such a deformation of the bladder 54 is performed without any problem because the bladder 54 can be bent and the filling fluid 58 can flow through the filling space 55 almost without resistance.

    Next, test examples will be described. In this test, eight types of inner molds having the same configuration with only different viscosities of the filling fluid filled in the filling space were manufactured, and after molding an unvulcanized tire using each inner mold, The vulcanized tire was vulcanized. Here, the viscosity (mPa · sec) of the filling fluid was changed from 0 to 1200, and the tire size was 275 / 80R22.5.

  The result is shown in FIG. 3, where the amount of protrusion is the reciprocal of the amount of unvulcanized tire rubber protruding between the molds by vulcanization, and the inner unvulcanized type in which the viscosity of the filling fluid is zero Tires are shown with an index of 100. From this graph of the amount of protrusion, it can be understood that as the viscosity of the filling fluid increases, deformation of the bladder during vulcanization (flow of the filling fluid) becomes difficult, so the amount of protrusion increases (the index value decreases) If the viscosity exceeds 600 mPa · sec, the burrs may become large until a cutting operation is required after vulcanization, which is not preferable.

  Regarding shape retention, uncured tires were molded and vulcanized using each inner mold only 100 times, and the change in the shape of the bladder at this time was that the viscosity of the filling fluid was 1200 mPa · sec. The inner type is shown as index 100. From this shape retention graph, it can be understood that the lower the viscosity of the filling fluid, the easier the bladder will be deformed, so the shape will change greatly over time. When the viscosity is less than 100 mPa · sec, vulcanization will occur. Since it may affect the uniformity of the used tire, it is not preferable.

  Next, after forming an unvulcanized tire using an inner mold made entirely of a rigid body described in the prior art, the conventional tire is vulcanized together with the outer mold, and the inner mold described in the above embodiment is also used. After the unvulcanized tire was molded using the tire, the tire was vulcanized together with the outer mold to produce an implemented tire. Here, the size of each tire was 275 / 80R22.5 as described above. Next, these tires were mounted on a uniformity machine, and the uniformity was measured. As a result, when the comparative tire was indicated by an index of 100, it was 105 in the case of the implemented tire. Here, the larger the numerical value, the better the uniformity.

  The present invention is applicable to an industrial field of an inner mold for manufacturing a tire used when manufacturing a pneumatic tire.

1 is a meridian cross-sectional view of an inner mold and an unvulcanized tire showing Embodiment 1 of the present invention. It is front sectional drawing of a tire vulcanizer. It is a graph which shows the relationship between the viscosity of a filling fluid, the amount of protrusion, and shape retainability.

Explanation of symbols

11 ... Inner mold 12 ... Unvulcanized tire
40… Inner body 45… Coating area
46 ... Exposed area 54 ... Blada
55 ... Filling space 58 ... Filling fluid
59 ... Elastic body 79 ... Outer mold
82 ... Vulcanization space

Claims (5)

    The inner mold body is made of a rigid body and has an outer surface having a covering area and an exposed area, and is provided so as to cover the covering area of the inner mold body, and the outer edge is hermetically locked to the inner mold body. A bendable bladder that forms a filling space therebetween, a filling fluid composed of a liquid filled in the filling space, and a urging force that is accommodated in the filling space so as to separate the bladder from the inner mold body. The outer surface shape of the bladder is defined, and in addition to the exposed area of the inner mold main body, the outer surface of the bladder is provided with a plurality of elastic bodies having substantially the same shape as the inner surface of the product tire. Internal mold for tire production.     2. The inner mold for manufacturing tires according to claim 1, wherein a magnetic fluid is used as the filling fluid, and a magnetic field is generated to stabilize the form of the magnetic fluid when an unvulcanized tire is molded outside the inner mold. .     The inner mold for manufacturing a tire according to claim 2, wherein the viscosity of the magnetic fluid at 20 ° C is in the range of 100 to 600 mPa · sec.     The inner mold for manufacturing a tire according to claim 2 or 3, wherein the elastic body is constituted by a leaf spring.     A step of forming tire constituent members one after another on the outer side of the inner mold for manufacturing a tire according to claim 1 to form an unvulcanized tire, and an outer die for vulcanizing the tire on the outer side of the unvulcanized tire A step of hermetically storing the unvulcanized tire in a vulcanization space formed between the inner mold and the outer mold, and vulcanizing the unvulcanized tire by supplying a vulcanized medium to the inner mold and the outer mold. And a tire manufacturing method using an inner mold for manufacturing a tire.

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