JP3950469B2 - Raw tire preheating method and apparatus - Google Patents

Description

  The present invention relates to a raw tire preheating method and apparatus for preheating a raw tire before vulcanization molding.

  Conventionally, green tires molded by a molding machine are stored in a rack at a storage location set in a building of a vulcanization facility in a room temperature environment, taken out from the rack based on a production plan, and then sent to a vulcanizer. Transported. When raw tires are brought into the vulcanizer, for example, in a bladder type vulcanizer, after the raw tires are loaded into the mold by clamping the mold, high-temperature and high-pressure heat is put into the bladder inserted into the tire holes. By supplying the medium, the bladder is extended and brought into close contact with the inner wall surface of the tire. And the tire groove of a mold is formed in the tread part of a green tire by pressing in the mold direction, heating a tire inner wall surface via a bladder. In addition, by heating the raw tire from the outside and inside with a heated mold and a bladder in contact with a high-temperature heat medium, the raw tire is quickly heated to a vulcanization start temperature (100 ° C. to 120 ° C. or higher). The vulcanization molding is completed in a short time.

JP-A-9-76238

  However, when the raw tire is stored in a room temperature environment for a long time as in the conventional case, the raw tire becomes a temperature close to room temperature, for example, 25 ° C., so when the raw tire is vulcanized with a vulcanizer. It is necessary to raise the temperature of the green tire from room temperature to the vulcanization start temperature. Conventionally, as described above, vulcanization molding is completed in a short time by heating from the outside and inside of the raw tire with a mold and a bladder. However, the raw tire is mainly made of rubber with low thermal conductivity. Therefore, even if the temperature on the surface side of the green tire is raised in a short time, the temperature rise on the inner side is delayed, especially the temperature rise at the center of the tread thick part or bead part with a large thickness is delayed. Becomes prominent. Therefore, even after the vulcanization of the front side of the green tire is completed, it is necessary to continue the vulcanization molding until the inside of the green tire is heated to the vulcanization temperature and the vulcanization is completed. There is a problem that it cannot be completed in a sufficiently short time.

  In addition, a method of preheating the raw tire before vulcanization molding may be adopted by irradiating the raw tire with microwaves during storage of the raw tire. What is the fundamental solution to complete the vulcanization molding in a short time because the front side is mainly preheated (heated) and the internal side where the temperature rise is most delayed during vulcanization molding cannot be sufficiently preheated Don't be.

  Such problems occur in various types of vulcanizers such as the bladder system and the bladderless system, and in particular in the bladder system vulcanizer, the bladder itself is also formed of rubber having a low thermal conductivity. Therefore, it is a bigger problem.

The present invention, as can be completed in a short time vulcanization sufficiently, the raw tire preheating method can be sufficiently preheated to the tire, and is intended to provide the apparatus.

Means for Solving the Problems and Effects of the Invention

In order to solve the above problems, the first invention is a raw tire preheating method, in which a raw tire is inflated by a holding mechanism before vulcanization molding of a raw tire in which a metal member is embedded inside the tire. holding Te, and the metal member to the induction heating and before molding vulcanization, is characterized by storing while preheating the green tire by the induction heating. According to the above configuration, since the metal member is induction-heated before vulcanization molding, it is possible to preheat while preferentially heating the tire inner side where the temperature rise is most delayed during vulcanization molding. Molding can be completed in a short time. Further, it is possible to prevent the raw tire from being deformed and the support center from being displaced.
The second invention is a raw tire preheating method, in a storage warehouse having a plurality of storage units for storing raw tires before vulcanization molding of the raw tires in which a metal member is embedded inside the tire, Between the induction heating of the metal member and the vulcanization molding, the raw tire is stored while being preheated by the induction heating. According to the above configuration, since the metal member is induction-heated before vulcanization molding, it is possible to preheat while preferentially heating the tire inner side where the temperature rise is most delayed during vulcanization molding. Molding can be completed in a short time. In addition, the raw tire can be temporarily stored according to the production plan before vulcanization molding.

At least one of the ◆ third invention, the first invention or a green tire preheating method of the second invention, the tread portion, bead portion and the metallic member embedded within the tire sidewall portion Is characterized by induction heating. According to said structure, since the inside of the tire of the tread part and / or bead part which has especially big thickness can be preheated, vulcanization molding can be completed more reliably in a short time.
The fourth invention is a raw tire preheating device for preheating a raw tire embedded with a metal member inside the tire, the holding mechanism for inflating and holding the raw tire, and the raw tire A tire support unit that is detachably supported in a predetermined posture, and a coil that induction-heats the metal member of the raw tire by the high frequency magnetic field by applying a high frequency magnetic field to the raw tire supported by the tire support unit The raw tire is inflated and held by the holding mechanism, and is stored while preheating the raw tire by the induction heating until it is vulcanized and molded. According to said structure, a metal member can be induction-heated with the high frequency magnetic field of a coil means, attaching a green tire to a tire support means and storing temporarily before vulcanization molding. Therefore, since the tire inner side where the temperature rise is most delayed at the time of vulcanization molding can be preheated while being preferentially heated, the vulcanization molding can be completed in a short time. Further, it is possible to prevent the raw tire from being deformed and the support center from being displaced.
The fifth invention is a raw tire preheating device for preheating a raw tire in which a metal member is embedded in the tire, and a storage warehouse having a plurality of storage units for storing the raw tire, In the storage unit, a tire support means for placing either the raw tire inflated and held by the holding mechanism or only the raw tire and detachably supporting the raw tire in a predetermined posture, and supported by the tire support means Coil means for inductively heating the metallic member of the raw tire by the high-frequency magnetic field by applying a high-frequency magnetic field to the formed raw tire, and the raw tire is inflated and held by the holding mechanism. In addition, the green tire is stored while being preheated by the induction heating until vulcanization molding is performed. According to the said structure, a metal member can be induction-heated with the high frequency magnetic field of a coil means, attaching a green tire to a tire support means and temporarily storing it before vulcanization molding. Therefore, since the tire inner side where the temperature rise is most delayed at the time of vulcanization molding can be preheated while being preferentially heated, the vulcanization molding can be completed in a short time. In addition, the raw tire can be temporarily stored according to the production plan before vulcanization molding.
The sixth invention is a raw tire preheating device according to the fourth or fifth invention, wherein the coil means is a metal member embedded in the tire in the tread part, bead part and side wall part. At least one of them is induction-heated. According to the above configuration, since the inside of the tire in the tread portion and / or the bead portion having a particularly large thickness can be preheated, vulcanization molding can be completed more reliably in a short time.

◆ A seventh invention is a green tire preheating method of the third invention is characterized in that induction heating the metal member embedded in the inside of the tread portion from the inside of the raw tire. According to the above configuration, the thickness of the inside of the raw tire is sufficiently thin with little variation in the type of tire, so that the distance between the coil means for induction heating and the metal member is reduced, and a sufficient alternating magnetic field is generated from the metal. It can be applied to the member, and the metal member can be efficiently induction-heated.

◆ An eighth invention is a green tire preheating method of the first to third invention, the induction heating is performed by a coil for generating a high frequency magnetic field, the frequency of the high frequency magnetic field, the raw tire inner metal It is characterized by being changed according to the structure of the manufactured member. According to the above configuration, the configuration of the metal member embedded in the tire varies depending on the type or size of the tire, and can be changed to an appropriate frequency according to the wire diameter or current penetration depth. It is possible to efficiently induction-heat metal members.

◆ A ninth invention is a green tire preheating method of the first to third invention, the induction heating is performed by a coil for generating a high frequency magnetic field, the relative distance of the raw tire and the coil, the raw It is characterized by being adjusted according to the configuration of the metal member inside the tire. According to said structure, since the magnetic flux density which passes a metal member can be adjusted according to the material structure or shape of a metal member, it is possible to induction-heat a metal member efficiently.

◆ A tenth invention is a green tire preheating method of the first to third invention and before shaping vulcanization, as characterized by incubating a green tire has been completed of the induction heating and during heating Yes. According to the above configuration, it is possible to prevent a decrease in temperature due to heat radiation from the preheated raw tire by induction heating the metal member inside the raw tire and to improve the heat uniformity of the raw tire. .

◆ An eleventh invention is a green tire preheating apparatus which performs preheating the raw tire metal member is embedded in the green tire, and the tire support means for detachably supporting the raw tire in a predetermined orientation And a coil means for inductively heating a metal member of the raw tire by the high frequency magnetic field by applying a high frequency magnetic field to the raw tire supported by the tire support means. According to said structure, a metal member can be induction-heated with the high frequency magnetic field of a coil means, attaching a green tire to a tire support means and storing temporarily before vulcanization molding. Therefore, since the tire inner side where the temperature rise is most delayed at the time of vulcanization molding can be preheated while being preferentially heated, the vulcanization molding can be completed in a short time.

◆ twelfth invention is the green tire preheating apparatus of the eleventh aspect, the raw tire, wherein the metallic member is buried respectively inside the tire at least the tread portion and the bead portion, said coil means The tread portion preheating coil means arranged along the tread portion of the raw tire and generating the high frequency magnetic field, and the bead portion preheating arranged along the bead portion of the raw tire and generating the high frequency magnetic field. And coil means for use. According to said structure, the tread part preheating coil means arrange | positioned along the tread part of a green tire applies a high frequency magnetic field with high magnetic flux density with respect to a tread part, The metal member of a tread part is made. Efficient induction heating. On the other hand, the bead part preheating coil means arranged along the bead part of the raw tire applies a high frequency magnetic field to the bead part with a high magnetic flux density, thereby efficiently induction-heating the metal member of the bead part. .

◆ A thirteenth invention is a green tire preheating apparatus of the eleventh aspect, the raw tire, wherein the metallic member is buried respectively inside the tire at least the tread portion and the bead portion, said coil means Further, the present invention is characterized by comprising columnar preheating coils that can be inserted into the tire holes of the green tire and that are formed and arranged so that both end portions are positioned at both bead portions of the green tire. According to the above configuration, the high-frequency magnetic field generated from the columnar preheating coil inserted through the tire hole inductively heats the metal member in the tread portion and the metal member in the bead portion. It is possible to sufficiently preheat the tire inside the tread portion and bead portion having a large wall thickness where the temperature is delayed. Furthermore, since the metal member of the tread portion and the bead portion can be induction-heated with only one columnar preheating coil, the component cost and the assembly cost can be reduced.

◆ A fourteenth invention is a one of the raw tire preheating apparatus of the eleventh invention to the thirteenth, a high-frequency magnetic field by the coil means as characterized in that a magnetic material for guiding the metallic member Yes. According to the above configuration, since the high frequency magnetic field generated by the coil means passes through the metal member and converges to the magnetic material, the magnetic flux density passing through the metal member increases, The member can be efficiently induction-heated.

◆ A fifteenth invention is a green tire preheating apparatus of the eleventh aspect, so that relative movement of said coil means along supported green tire on the tire support means in a circumferential direction of the raw tire, It has the moving means which performs at least one of the rotational movement of the said tire support means, and the turning movement of the said coil means. According to the above configuration, since the coil means relatively moves along the raw tire, even if the coil means applies a strong high-frequency magnetic field to a part of the raw tire due to low assembling accuracy or processing accuracy. In addition, a strong high-frequency magnetic field can be applied uniformly over the entire raw tire for induction heating. Therefore, the coil means can be reduced in size, and the assembly work of the coil means can be facilitated.

◆ A sixteenth aspect of the present invention, the invention of eleventh to thirteenth, 11th be any raw tire preheating apparatus of the invention, the high frequency power supply for generating a high-frequency magnetic field to said coil means and a variable its frequency It is characterized by comprising frequency changing means. According to the above configuration, the configuration of the metal member embedded in the tire varies depending on the type or size of the tire, and the appropriate frequency can be changed according to the wire diameter or current penetration depth. It is possible to efficiently induction-heat metal members.

◆ The seventeenth aspect of the invention is the raw tire preheating device of the sixteenth aspect of the invention, characterized in that a capacitor for generating a resonance current is connected to the coil means. According to the above configuration, since the resonance circuit is formed by the capacitor, the heat generation efficiency of the entire apparatus is improved, the power factor can be improved, and the metal member can be efficiently induction-heated. .

◆ eighteenth aspect of the present invention, the invention of eleventh to thirteenth, be any of the raw tire preheating apparatus of the sixteenth aspect, with respect to the metal member embedded in the tire, near the coil unit It is characterized by having a relative distance adjusting means so as to be adjustable in a separable manner. According to the above configuration, it is possible to adjust the magnetic flux density passing through the metal member according to the material configuration or shape of the metal member, and thus it is possible to efficiently induction heat the metal member. is there.

◆ nineteenth aspect of the present invention, a fifteenth green tire preheating apparatus of the invention, the moving stage, as the tire center axis of the green tire supported by the tire supporting means is a rotation center, the tire support A rotational movement mechanism for rotating the means, wherein the coil means is disposed along a part of the tread portion and the bead portion of the raw tire and has a partial preheating coil for generating the high-frequency magnetic field. It is a feature. According to said structure, since the coil for partial preheating can be formed in small size, a preheating apparatus can be reduced in size.

◆ twentieth aspect of the present invention, a green tire preheating apparatus of the nineteenth invention, the coil means forming part preheat for said tread portion is characterized in that disposed inside the raw tire. According to the above configuration, the thickness of the inside of the raw tire is sufficiently thin with little thickness variation depending on the type of tire, so the distance between the tread portion preheating coil means and the metal member is reduced, and a sufficient alternating magnetic field is applied to the metal member. It becomes possible to apply, and it is possible to induction-heat a metal member efficiently.

An embodiment of the present invention will be described below with reference to FIGS.
The raw tire preheating apparatus according to the present embodiment is provided in a storage process as shown in FIG. The storage process is arranged between the molding process for molding the raw tire 4 and the vulcanization process for vulcanizing the raw tire 4, and the raw tire 4 is temporarily stored in accordance with the production plan before vulcanization molding. Keep. In addition, operation | movement of the raw tire preheating apparatus in a storage process and the raw tire preheating method by this apparatus are mentioned later.

  The vulcanization process in which the raw tire 4 is supplied from the storage process includes a vulcanizer 1 that vulcanizes and molds the raw tire 4. As shown in FIG. 3, the vulcanizer 1 includes a mold fixing unit 2 set at a predetermined height position and a mold lifting unit 3 that moves up and down with respect to the mold fixing unit 2. As shown in FIG. 7, the raw tire 4 includes a carcass assembly 51 having both ends bent, a metal bead wire 52 provided at a bent portion of the carcass assembly 51, and a carcass assembly 51. Rubber inner liner 53 affixed to the peripheral surface, rubber tread member 54 and side wall member 55 respectively affixed to the outer peripheral surface and the side peripheral surface of carcass assembly 51, tread member 54 and carcass By having the metal belt member 56 provided between the assemblies 51, the metal members (the bead wire 52 and the belt member 56) are placed inside the tire of the large-thick tread portion 4a and the bead portions 4c and 4c ′. It has the composition which it has.

  As shown in FIG. 3, the mold elevating unit 3 includes an upper side mold 25 that contacts the upper side wall 4 b ′ of the raw tire 4, a split mold 26 positioned in the outer peripheral direction of the tread portion 4 a of the raw tire 4, and the upper side A first mold elevating mechanism 27 that elevates and lowers the slide segment 26a of the mold 25 and the split mold 26, an upper heating mechanism 28 that heats the upper side mold 25 to a predetermined temperature, and a fixing ring 26b of the upper heating mechanism 28 and the split mold 26 are provided. It has the 2nd mold raising / lowering mechanism 29 to raise / lower, and the supporting member 30 which supports these mechanisms 27-29 grade | etc.,.

  The upper heating mechanism 28 has a disk-shaped upper platen 32. The upper platen 32 has an internal space to which high-temperature steam is supplied. The upper platen 32 generates heat by the steam supplied to the internal space and heats the upper side mold 25 in a planar shape. Further, the upper heating mechanism 28 includes a platen support 33 that supports the upper platen 32, and a heat insulating plate 34 that is interposed between the upper platen 32 and the platen support 33 so that the heat of the upper platen 32 is not transmitted to the platen support 33. have.

  Further, a rod-shaped member 35 of the first mold lifting mechanism 27 is inserted through the central portion of the upper heating mechanism 28 so as to be movable up and down. As shown in FIG. 4, a disc-shaped slide plate 36 is provided at the lower end of the rod-shaped member 35. At the center of the lower surface of the slide plate 36, the upper side mold 25 is fixed on the center side. An upper bead ring 40 formed so as to contact the upper bead portion 4 c ′ of the raw tire 4 is provided on the inner peripheral portion of the upper side mold 25. An annular third induction heating coil 41 is provided inside the upper bead ring 40. The high frequency power supply 24 of FIG. 6 is connected to the third induction heating coil 41, and the third induction heating coil 41 is supplied with high frequency power to the upper bead portion 4c ′ of the raw tire 4 with a high frequency magnetic field. Is applied, the bead wire 52 of the upper bead portion 4c ′ is preferentially induction-heated.

  A slide segment 26 a having a plurality of segment molds 26 a ′ formed of a nonmagnetic material such as aluminum is provided on the outer periphery of the lower surface of the slide plate 36. The slide segments 26a are arranged at equal intervals on the same circumference around the upper side mold 25, and are engaged so as to be movable in the center direction. A fixing ring 26b made of a nonmagnetic material is disposed in the outer direction of these slide segments 26a. The fixing ring 26b is fixed to the peripheral surface of the lower surface of the upper platen 32, and moves the slide segment 26a forward and backward in the radial direction while engaging the outer surface of the slide segment 26a. The slide segment 26a forms a cylindrical mold corresponding to the tread portion 4a of the raw tire 4 when moved in the center direction by the fixing ring 26b.

  A mold fixing unit 2 is disposed below the mold lifting unit 3. The mold fixing unit 2 includes a lower side mold 5 that contacts the lower side wall 4 b of the raw tire 4, a lower heating mechanism 9 that heats the lower side mold 5 to a predetermined temperature, and the centers of the lower heating mechanism 9 and the lower side mold 5. And a base frame 11 that supports the center mechanism 10 and the lower heating mechanism 9.

  The lower heating mechanism 9 has a disk-shaped lower platen 6 that supports the lower side mold 5 in a planar shape. The lower platen 6 has an internal space to which high-temperature steam is supplied. The lower platen 6 generates heat by the steam supplied to the internal space and heats the lower side mold 5 in a planar shape. Further, the lower heating mechanism 9 includes a platen support 7 that supports the lower platen 6, and a heat insulating plate 8 that is interposed between the lower platen 6 and the platen support 7 so that the heat of the lower platen 6 is not transmitted to the platen support 7. have. And the center mechanism 10 is provided in the center part of the lower heating mechanism 9 comprised in this way, and the center mechanism 10 is provided with the holding mechanism 71 as the main part.

  The holding mechanism 71 is detachably attached to the mold fixing portion 2 (the lower heating mechanism 9 and the lower side mold 5). As shown in FIGS. 1 and 3, the bladder 20 and the lower edge portion of the bladder 20 are provided. The lower ring mechanism 12 holding the upper ring 19, the upper ring 19 holding the upper edge of the bladder 20, and the lower ring mechanism 12 and the center of the upper ring 19 are slidably penetrated to connect the rings 12, 19. The center post 22 that can be fixed has the following connection relationship and positional relationship.

  That is, as shown in FIG. 4, the lower ring mechanism 12 is provided on the lower bead ring 13 formed so as to contact the lower bead portion 4 c of the raw tire 4 and the upper surface of the lower bead ring 13. The lower bladder ring 14 sandwiches the lower edge portion of the bladder 20 and the clamp ring hub 15 provided on the inner peripheral side of the lower bladder ring 14. Inside the clamp ring hub 15, supply / discharge passages 15 a and 15 a for circulating a pressurized heating medium such as steam and nitrogen gas are formed. These supply / discharge passages 15a and 15a communicate with each other from the upper end surface to the lower end surface of the clamp ring hub 15, and the lower supply / discharge passages 15a and 15a are connected via pipes 17a and 17a and open / close valves 17b and 17b. It is in contact with a pressurizing / heating medium supply device (not shown) so as to be able to contact and separate.

  An annular first induction heating coil 18 is provided inside the lower bead ring 13. The first induction heating coil 18 is connected to a high frequency power source 24 shown in FIG. And the 1st induction heating coil 18 preferentially heats the bead wire 52 of the lower bead part 4c by applying a high frequency magnetic field to the lower bead part 4c of the raw tire 4 by supplying high frequency power.

  A center post 22 is erected at the center of the lower ring mechanism 12 so as to be slidable in the vertical direction. An upper ring 19 is provided at the upper end of the center post 22. The upper ring 19 has an upper bladder ring 21, and the upper bladder ring 21 sandwiches the upper edge portion of the bladder 20. On the other hand, a post elevating mechanism (not shown) that raises and lowers the center post 22 to an arbitrary height position is connected to the lower end portion of the center post 22 so as to be able to contact and separate. 10 is constituted. Then, the post lifting mechanism raises the center post 22 to the upper limit position so that the upper edge of the bladder 20 is lifted and the bladder 20 is set to a diameter smaller than the tire hole of the tire 4 when the vulcanized tire is carried out. On the other hand, at the time of vulcanization molding of the raw tire 4, the center post 22 is lowered so as to expand the bladder 20 to a diameter that can contact the inner wall surface of the raw tire 4.

  The bladder 20 expanded and contracted by the center post 22 presses the inner wall surface of the tire in the molding direction by supplying a pressurizing medium when the raw tire 4 is vulcanized and molded, and is hardly deteriorated in a high temperature environment. It has an extensible material as a constituent member. This low-stretchability material is formed in substantially the same shape as the inner wall surface of the tire when the raw tire 4 is vulcanized and formed into a vulcanized tire. That is, as shown in FIG. 6, the bladder 20 employs a low-stretching material that hardly changes in quality in a high-temperature environment, and this material is formed to have the same shape as the inner wall surface of the vulcanized tire. And a plurality of magnetic members 20b provided at equal intervals on the surface of the bladder body 20a. The magnetic member 20b is made of a metal thin film having magnetism such as a mesh metal or a metal vapor deposition film, for example, so that a portion corresponding to the tread portion 4a of the raw tire 4 has a larger area than other portions. Is formed.

  The low stretchable material is a material having a physical property value with a smaller elongation rate than a conventional rubber for bladder (for example, butyl rubber) in a high temperature environment of the vulcanization temperature, and particularly in a high temperature environment of 200 ° C. The elongation is preferably in the range of 5% to 15%. The reason why the elongation rate is preferably in the above range is that when it is less than 5%, the force for uniformly pressing the whole raw tire 4 at the time of vulcanization molding is lowered and the moldability becomes insufficient. If it exceeds 15%, it becomes difficult to vulcanize and mold the raw tire 4 with high accuracy, as in the case of conventional rubber for bladder (for example, butyl rubber).

  In addition, low stretch materials that do not easily change in high temperature environments include knitted and woven fabrics using fibers such as polyester, nylon, aramid, polyparaphenylene benzobisoxazole (PBO), mesh metal, high density fibers, and carbon. A fiber, a metal-coated fiber, a resin-coated fiber, or the like can be used, and a mixture of one or more of these materials can be used. Examples of the mixed form include a laminated structure in which a mesh film is laminated on a polyester film, a metal film is deposited on a polyester film, and a form in which metal-coated fibers and high-density fibers are woven while being evenly or unevenly distributed. . Further, in order to provide airtightness, there is also a form in which a substrate such as a knitted fabric or a woven fabric is impregnated or coated with at least one of a resin such as fluorine and silicon and an elastomer. These forms are appropriately selected according to the design specifications of the bladder (the presence or absence of heat generated by induction heating, the strength, etc.).

  A second induction heating coil 23 is arranged inside the bladder 20. The second induction heating coil 23 is provided around the center post 22 and is set to a coil height smaller than the distance when the upper bladder ring 21 and the lower bladder ring 14 are closest to each other, and the reduced bladder. The coil diameter is set to be smaller than the outer diameters of both the rings 21 and 14 so as not to contact the ring 20. Further, the second induction heating coil 23 is arranged so as not to contact both the rings 21 and 14 even when the upper bladder ring 21 is lowered to the lower limit position. A high frequency power supply 24 is connected to the second induction heating coil 23 so as to be able to contact and separate, and the second induction heating coil 23 applies a high frequency magnetic field to the bladder 20 by supplying high frequency power. The magnetic member 20b of the bladder 20 is preferentially induction heated.

  As shown in FIG. 2, the holding mechanism 71 is conveyed between the vulcanization process, the storage process, and the molding process by the conveying device 43 of FIG. And in the molding process, it functions as a molding drum, and during the storage process and transport between processes, it functions to prevent the raw tire 4 from being deformed and to prevent the shift of the support center. Functions as the main part of the central mechanism 10 described above.

  The molding process includes a single stage type tire molding machine 61. The tire molding machine 61 may be a two-stage system. As shown in FIG. 2, the tire forming machine 61 has a first drive device 62 and a second drive device 63. The first driving device 62 and the second driving device 63 are provided with a first chuck mechanism 64 and a second chuck mechanism 65, respectively. These chuck mechanisms 64 and 65 have chuck members 64 a and 65 a that can hold the center portions of the upper ring 19 and the lower ring mechanism 12 of the holding mechanism 71, respectively. The chuck mechanisms 64 and 65 are arranged to face each other so that the rotation axes are on the same straight line, and are interlocked so as to rotate at the same rotation speed and stop at the same rotation angle. Further, one of the first chuck mechanisms 64 is configured to be movable back and forth in the direction of the rotation axis, and the ring interval between the upper ring 19 and the lower ring mechanism 12 of the holding mechanism 71 is increased and reduced when the green tire 4 is molded and taken out. Reduce. Further, the tire molding machine 61 has a pressure gas supply device (not shown) that supplies pressure gas into the bladder 20 when the raw tire 4 is taken out.

  As shown in FIG. 2, the raw tire 4 created in the molding process is transported while being held by the holding mechanism 71 and is transported to a storage process or a vulcanization process, which are subsequent processes. The storage process has a storage warehouse 80. The storage warehouse 80 has a plurality of storage units 81 that store the raw tire 4 while holding it with a holding mechanism 71. Each storage unit 81 includes a raw tire preheating device as shown in FIG. The raw tire preheating device includes a cylindrical mounting table 82 formed so as to contact the lower surface of the lower ring mechanism 12, and a preheating induction heating coil 83 provided so as to surround the raw tire 4 on the mounting table 82. And a high-frequency power source 84 for supplying high-frequency power to the preheating induction heating coil 83. The preheating coil 83 preferentially induction-heats the belt member 56 of the tread portion 4a by applying a high frequency magnetic field to the tread portion 4a of the raw tire 4 by supplying high frequency power from the high frequency power source 84. .

  In the above configuration, the raw tire preheating method will be described through the operation of the raw tire preheating device.

  First, as shown in FIG. 2, in the molding process, when the green tire 4 composed of a plurality of layers having the belt member 56 and the bead wire 52 therein is created by the tire molding machine 61, the upper ring 19 and the lower portion of the holding mechanism 71 are formed. The ring mechanism 12 is connected and fixed to the center post 22, and the first chuck mechanism 64 is separated from the upper ring 19. Then, after gripping the center portion of the upper ring 19 by the transport device 43 in FIG. 1, the chuck mechanism 65 is separated from the lower ring 12, and the holding mechanism 71 is pulled upward to form the tire 4 together with the holding mechanism 71. Remove from machine 61. When there is a waiting time until the raw tire 4 is vulcanized, the holding mechanism 71 inflates and holds the raw tire 4 and conveys it to the raw tire preheating device in the storage process. The raw tire 4 is stored while preheating.

  That is, as shown in FIG. 1, the holding mechanism 71 holding the raw tire 4 is positioned above the mounting table 82 in the raw tire preheating device. Then, the raw tire 4 is stored together with the holding mechanism 71 by lowering the holding mechanism 71 and placing it on the mounting table 82. After that, by supplying high frequency power from the high frequency power supply 84 to the preheating coil 83, a high frequency magnetic field is applied to the tread portion 4a of the raw tire 4 to inductively heat the belt member 56 of the tread portion 4a. The high frequency magnetic field generated by the preheating coil 83 also induction heats the bead wires 52 of the bead portions 4c and 4c '. Thereby, even if the raw tire 4 is stored in an environment at room temperature, the large-thick tread portion 4a and the bead portions 4c and 4c ′ of the raw tire 4 are heated from the inside of the tire by the raw tire preheating device. The temperature of the green tire 4 is not lowered, and the green tire 4 is heated to a temperature close to the vulcanization temperature depending on the degree of application of the high-frequency magnetic field.

  Next, when the raw tire 4 is vulcanized and molded, the raw tire 4 is conveyed to the vulcanization process while being held by the holding mechanism 71, and the raw tire 4 is vulcanized and molded by the following operation. That is, first, as shown in FIG. 3, the mold elevating part 3 is positioned above the mold fixing part 2 by raising the mold elevating part 3. Thereafter, the raw tire 4 is transported between the mold fixing unit 2 and the mold lifting / lowering unit 3 together with the holding mechanism 71 by the transport device 43. As shown in FIG. 4, when the holding mechanism 71 is positioned above the center portion of the mold fixing portion 2, the holding mechanism 71 is lowered to engage the holding mechanism 71 with the mold fixing portion 2. Then, after the connection and fixing of the upper ring 19 and the lower ring mechanism 12 by the center post 22 are released, the center post 22 of the holding mechanism 71 is connected to a post lifting mechanism (not shown), and the open / close valves 17a and 17b and the induction heating coil are connected. 18, 23, and 41 are connected to a gas supply device (not shown) and the high-frequency power source 24 of FIG. 6 to function as the central mechanism 10.

  Next, while the cylinder rod 38a is advanced from the second cylinder member 38 of FIG. 3 and the rod-like member 35 is advanced from the first cylinder member 37, the upper heating mechanism 28 and the slide plate 36 are respectively lowered and separated. The slide segment 26a is moved in the outer peripheral direction. Thereafter, as shown by a two-dot chain line in FIG. 4, the mold elevating unit 3 is lowered while maintaining the separated state of the upper heating mechanism 28 and the slide plate 36, and the raw tire 4 is positioned on the inner peripheral side of the slide segment 26a. Then, the slide segment 26a is moved in the center direction by the fixing ring 26b. As shown in FIG. 5, the slide segments 26a are brought into contact with each other to form a cylindrical mold corresponding to the tread portion 4a of the raw tire 4, and the upper side mold 25 and The mold clamping of the mold is completed by bringing the lower side molds 5 into contact with each other.

  High temperature steam is supplied to the upper platen 32, the lower platen 6, and the fixing ring 26 a of the split mold 26, and the upper and lower side molds 25, 5 are heated by both the platens 6, 32 and the split mold 26. By heating the slide segment 26a, the green tire 4 surrounded by the molds 25, 5, 26a ′ is heated from the outer surface side. Further, by supplying a pressure medium such as high-temperature and high-pressure steam or nitrogen gas into the bladder 20 through the gas pipe 17a, the bladder 20 presses the raw tire 4 against the inner wall surface of the mold. Then, the raw tire 4 is heated from the inner surface side by transmitting the amount of heat of the high-temperature and high-pressure medium to the raw tire 4 through the bladder 20.

  Further, as shown in FIG. 6, high frequency power is supplied from the high frequency power supply 24 to the induction heating coils 18, 23, 41, and 39. The first induction heating coil 18 and the third induction heating coil 41 to which the high frequency power is supplied apply both high-frequency magnetic fields to the lower bead portion 4c and the upper bead portion 4c ′ of the raw tire 4 to thereby form both bead portions. The bead wires 52 and 52 provided inside 4c and 4c ′ are preferentially induction-heated. The fourth induction heating coil 39 is provided inside the tread portion 4a by applying a strong high-frequency magnetic field to the tread portion 4a of the raw tire 4 because the split mold 26 is formed of a nonmagnetic material. The belt member 56 is preferentially heated by induction. Thereby, in addition to the heating from the outer surface side and the inner surface side, the raw tire 4 is also heated from the tire inner side in the bead portions 4c and 4c ′ and the tread portion 4a having a large thickness. The temperature of the entire tire is raised to the vulcanization temperature in a short time.

  In addition, the raw tire 4 conveyed from the storage process has the bead portions 4c and 4c ′ and the tread portion 4a having a large thickness added even when stored in a room temperature environment for a long time. Since it is preheated to a temperature close to the vulcanization temperature, the entire raw tire 4 is heated to the vulcanization temperature in a very short time after the heating for vulcanization is started. Moreover, you may provide the process of heat-retaining the induction-heated raw tire 4 until it vulcanizes and molds. Specifically, the preheated raw tire 4 is put in a heat insulating box, and then heated so as to keep the raw tire 4 near the preheating temperature until just before reaching the vulcanization step. Thereby, while preventing the temperature fall by the heat radiation from the raw tire 4 which has been preheated to a predetermined temperature, the heat uniformity of the raw tire 4 can be improved.

  The second induction heating coil 23 supplied with the high frequency power applies a high frequency magnetic field to the magnetic member 20b of the bladder 20 to cause the bladder 20 itself to generate heat. Therefore, when the heat quantity of the pressure medium is transmitted to the raw tire 4 via the bladder 20, the delay of the heat quantity transmission time by the bladder 20 is minimized, so that the raw tire 4 is vulcanized in a shorter time. Raise to temperature. The raw tire 4 is vulcanized and molded while the raw tire 4 is maintained at the vulcanization temperature.

  Further, while the raw tire 4 is being vulcanized and molded, the bladder 20 is molding the raw tire 4 by pressing the raw tire 4 in the molding direction. At this time, since the bladder 20 is formed of a low-stretch material having substantially the same shape as the inner wall surface of the vulcanized tire, the vulcanized tire can be used even when the pressure of the pressure medium varies slightly. The shape of the inner wall surface of the tire surely appears. Therefore, when the green tire 4 is pressed by the bladder 20 and molding is performed, a vulcanized tire molded with high accuracy is obtained.

  When the vulcanized tire is obtained in this manner, as shown in FIG. 4, the mold is opened by an operation opposite to the above-described operation, and then the center post 22 is raised to reduce the bladder 20. Then, after the vulcanized tire 4 'is removed from the holding mechanism 71 and taken out to the outside, the holding mechanism 71 is taken out to the outside, and the vulcanized tire 4' is conveyed to a subsequent process, while the holding mechanism 71 is formed in the molding process Transport to. Thereafter, the fresh green tire 4 is carried in and vulcanization molding is repeated by the above operation. Even when such vulcanization formation is repeated, the low-stretch material of the bladder 20 is in a high temperature environment. The low stretch material maintains the initial properties because it is difficult to change below. Therefore, even when the number of repetitions of vulcanization molding increases, the bladder 20 can surely appear the shape of the tire inner wall surface of the vulcanized tire, so that the bladder 20 can be used for a long period of time.

  As described above, as shown in FIG. 1, in the present embodiment, the raw tire preheating method in which the metal member is induction-heated before vulcanization molding of the raw tire 4 in which the metal member is embedded inside the tire. By carrying out the above, it is possible to complete the vulcanization molding in a short time by preheating while preferentially heating the inner side of the raw tire where the temperature rise is most delayed during the vulcanization molding. Specifically, by induction heating at least one of a belt member 56 (metal member) and a bead wire 52 (metal member) embedded in the tire of the tread portion 4a and the bead portions 4c and 4c ′, respectively. In particular, the inside of the tire of the tread portion 4a and / or the bead portions 4c and 4c ′ having a particularly large thickness is preheated, thereby making it possible to complete the vulcanization molding more reliably in a short time. In addition, in this embodiment, although the case where a metal member was embedded in tread part 4a and bead parts 4c * 4c 'was explained, it was not limited to this but had big thickness The present invention can be applied even when a metal member is embedded in an arbitrary portion. For example, when a metal member is embedded in the side walls 4b and 4b ′ which are the side wall portions, among the metal members embedded in the tread portion 4a, the bead portions 4c and 4c ′ and the side walls 4b and 4b ′. At least one of them may be induction-heated.

  In the present embodiment, the raw tire preheating method includes a mounting table 82 (tire support means) that detachably supports the raw tire 4 in a predetermined posture, and a raw tire 4 supported by the mounting table 82 (tire support means). This is implemented by a raw tire preheating device having a preheating coil 83 that induction-heats the metal member of the raw tire 4 by a high frequency magnetic field by applying a high frequency magnetic field.

  The raw tire preheating device according to the present embodiment is configured so that the tread portion 4a and the bead portions 4c and 4c are provided by the preheating coil 83 disposed around the raw tire 4 while holding the raw tire 4 from the inside by the holding mechanism 71. However, the present invention is not limited to this, and is not limited to this, so that it can be applied to general bladder type or bladderless type vulcanizers. It may be configured to preheat while storing only the tire 4.

  Therefore, the raw tire preheating device may be configured as shown in FIGS. 8 (a) and 8 (b) will be described in detail. The raw tire preheating device is arranged along the mounting table 90 on which the raw tire 4 is mounted and the tread portion 4a of the raw tire 4 on the mounting table 90. And a tread portion preheating coil 91 that generates a high frequency magnetic field. A rotation driving device (not shown) is connected to the center of the lower surface of the mounting table 90 via a rotation shaft 95, and the rotation driving device rotates the raw tire 4 together with the mounting table 90 in the horizontal direction when the raw tire 4 is stored. Let A lower bead portion preheating coil 92 is provided inside the mounting table 90, and the lower bead portion preheating coil 92 applies a strong high-frequency magnetic field to the bead wire 52 (metal member) of the lower bead portion 4c. Therefore, it arrange | positions along the lower bead part 4c.

  A support member 93 is erected at the center of the upper surface of the mounting table 90. The support member 93 supports the upper bead portion preheating coil 94, and the upper bead portion preheating coil 94 is set to have a smaller coil diameter than the tire hole of the raw tire 4. The upper bead portion preheating coil 94 applies a high-frequency magnetic field to the bead wire 52 (metal member) of the upper bead portion 4c ′, and therefore the upper bead portion 4c is positioned at substantially the same height as the upper bead portion 4c ′. It is arranged along '.

  In the above configuration, when the raw tire 4 is stored, the raw tire 4 is moved in the horizontal direction by a conveying device (not shown), positioned above the mounting table 90, and then lowered in the vertical direction to preheat the upper bead portion in the tire hole. The coil 94 is placed on the mounting table 90 while being inserted. Thereafter, the mounting table 90 and the raw tire 4 are rotated in the horizontal direction via a rotating shaft 95 by a rotation driving device (not shown), and high frequency power is supplied to each preheating coil 91, 92, 94 from a high frequency power source (not shown). .

  The coil 91 for preheating the tread portion supplied with the high frequency power efficiently inductively heats the belt member 56 of the tread portion 4a by applying a high frequency magnetic field to the tread portion 4a with a high magnetic flux density. On the other hand, the bead portion preheating coils 92 and 94 efficiently induction heat the bead wires 52 of the bead portions 4c and 4c ′ by applying a high frequency magnetic field to the bead portions 4c and 4c ′ at a high magnetic flux density. To do. As a result, it is possible to sufficiently preheat the inside of the tire in the large-thickness tread portion 4a and bead portions 4c and 4c 'that are particularly delayed in temperature during vulcanization molding.

  Further, since the raw tire 4 is rotated in the horizontal direction, the tread portion preheating coil 91 and the upper bead portion preheating coil 94 are relatively moved along the raw tire 4. Therefore, even if the preheating coils 91 and 94 are applied with a high frequency magnetic field non-uniformly to the tread portion 4a and the upper bead portion 4c ′ of the raw tire 4 due to low assembly accuracy and processing accuracy, the raw tire 4 Inductive heating can be performed by uniformly applying a high-frequency magnetic field throughout. Thereby, since it is not necessary to assemble or process the preheating coils 91 and 94 with high accuracy, the assembling operation and the processing operation can be facilitated.

  9A and 9B will be described in detail. The raw tire preheating device includes a mounting table 96 on which the raw tire 4 is mounted. The mounting table 96 is fixed while being supported by a support table 97. A through hole 96a is formed at the center of the mounting table 96, and a rotation support shaft 98 is rotatably inserted into the through hole 96a. A columnar preheating coil 99 is fixed to the upper portion of the rotation support shaft 98 above the mounting table 96. The columnar preheating coil 99 is set to have a smaller coil diameter than the tire hole of the raw tire 4 so as to be inserted into the tire hole of the raw tire 4. Further, the columnar preheating coil 99 applies a high-frequency magnetic field to the bead wires 52 (metal members) of the bead portions 4c and 4c ′ and the belt member 56 (metal member) of the tread portion 4a. 4c 'and 4c are formed and arranged so that both ends are located. On the other hand, a rotation drive device (not shown) is connected to the lower end portion of the rotation support shaft 98, and the rotation drive device rotates the rotation support shaft 98 when the raw tire 4 is stored, so that the columnar preheating coil 99 is rotated. Turn on the inner side of the raw tire 4.

  When storing the raw tire 4, the raw tire 4 is moved in the horizontal direction by a conveying device (not shown), positioned above the mounting table 90, then lowered in the vertical direction, and placed while inserting the columnar preheating coil 99 through the tire hole. It is mounted on the mounting table 90. Thereafter, the columnar preheating coil 99 is turned inside the raw tire 4 via the rotation support shaft 98 by a rotation driving device (not shown), and high frequency power is supplied to the columnar preheating coil 99 from a high frequency power source (not shown).

  The columnar preheating coil 99 supplied with the high frequency power efficiently induces the bead wires 52 of the bead portions 4c and 4c ′ by applying a high frequency magnetic field to the tread portion 4a and the bead portions 4c and 4c ′ with a high magnetic flux density. While heating, the belt member 56 of the tread portion 4a is efficiently induction-heated. As a result, it is possible to sufficiently preheat the inside of the tire in the large-thickness tread portion 4a and bead portions 4c and 4c 'that are particularly delayed in temperature during vulcanization molding.

  Further, since the columnar preheating coil 99 is turned around the rotation support shaft 98, the columnar preheating coil 99 is relatively moved along the raw tire 4. Therefore, even if the columnar preheating coil 99 applies a high-frequency magnetic field nonuniformly to the tread portion 4a and the bead portions 4c and 4c ′ of the raw tire 4 due to low assembly accuracy and processing accuracy, the raw tire 4 Inductive heating can be performed by uniformly applying a high-frequency magnetic field throughout. Thereby, since it is not necessary to assemble or process the columnar preheating coil 99 with high accuracy, the assembling operation and the processing operation can be facilitated.

  10A and 10B will be described in detail. The raw tire preheating device includes a mounting table 90 on which the raw tire 4 is mounted. A rotation driving device and a lifting device (not shown) are connected to the center of the lower surface of the mounting table 90 via a rotation shaft 95. The rotation driving device horizontally holds the raw tire 4 together with the mounting table 90 when the raw tire 4 is stored. Rotate in the direction. Further, the lifting device raises the mounting table 90 to the storage position indicated by a solid line during storage, and lowers the raw tire 4 to a loading / unloading position indicated by a two-dot chain line when the raw tire 4 is loaded / unloaded.

  A lower bead portion preheating coil 92 is provided in the mounting table 90. The lower bead portion preheating coil 92 is disposed along the lower bead portion 4c in order to apply a high-frequency magnetic field to the bead wire 52 (metal member) of the lower bead portion 4c. On the other hand, an upper bead portion preheating coil 100 is disposed above the mounting table 90. The upper bead portion preheating coil 100 is set to have a coil diameter substantially equal to the tire diameter of the raw tire 4. The upper bead portion preheating coil 100 applies a high-frequency magnetic field to the bead wire 52 (metal member) of the upper bead portion 4c ′, and therefore the upper bead portion 4c ′ is slightly above the upper bead portion 4c ′. It is arranged along.

  Furthermore, the raw tire preheating device has a partial preheating coil 101 formed in an inverted U shape. The partial preheating coil 101 is arranged along a part of the tread portion 4a of the raw tire 4 when the raw tire 4 is placed on the mounting table 90 and raised to the storage position (the solid line in the drawing). Yes. The partial preheating coil 101 is connected to a high-frequency power source 102 and applies a high-frequency magnetic field to the tread portion 4 a by supplying power from the high-frequency power source 102.

  When storing the raw tire 4, the mounting table 90 is lowered to the loading / unloading position, and then the raw tire 4 is moved by a transport device (not shown) between the mounting table 90 and the upper bead portion preheating coil 100. Position it. Then, the raw tire 4 is lowered in the vertical direction and placed on the placing table 90. Thereafter, the mounting table 90 is raised to the storage position indicated by the solid line in the drawing, whereby the raw tire 4 on the mounting table 90 is brought close to the partial preheating coil 101 and the upper bead portion preheating coil 100.

  When the raw tire 4 is set in the storage position as described above, the raw tire 4 is rotated in the horizontal direction via the mounting table 90 by a rotation driving device (not shown), and high frequency power is supplied from the high frequency power source 102 and the like to each preheating coil. 92, 100, and 101. The lower bead portion preheating coil 92 and the upper bead portion preheating coil 100 to which the high frequency power is supplied apply a high frequency magnetic field to the whole bead portions 4c and 4c ′ at a high magnetic flux density, thereby making the bead portions 4c and 4c ′. The entire bead wire 52 is efficiently induction-heated.

  The partial preheating coil 101 efficiently induction-heats a part of the belt member 56 of the tread portion 4a, that is, a part closest to the coil 101. At this time, since the raw tire 4 is rotated, the partial preheating coil 101 is relatively moved along the tread portion 4 a of the raw tire 4. Therefore, even when the partial preheating coil 101 heats a part of the tread portion 4a, the same state as when induction heating is performed by uniformly applying a high-frequency magnetic field over the entire tread portion 4a by rotation of the raw tire 4 become. As a result, since the preheating coil 101 can be formed in a smaller size than when the preheating coil is formed so as to surround the entire tread portion 4a, the raw tire preheating device can be reduced in size and power consumption. be able to.

  Further, since the raw tire 4 is rotated, the upper bead portion preheating coil 100 is also relatively moved along the raw tire 4. Therefore, even if the upper bead portion preheating coil 100 is to apply a high-frequency magnetic field non-uniformly to the upper bead portion 4c ′ of the raw tire 4 due to low assembly accuracy or processing accuracy, the entire raw tire 4 is covered. A high frequency magnetic field can be applied uniformly to perform induction heating. Thereby, since it is not necessary to assemble or process the upper bead portion preheating coil 100 with high accuracy, the assembling operation and the processing operation can be facilitated.

  In the raw tire preheating device of FIG. 8 or FIG. 10, either the raw tire 4 or the preheating coil (upper bead portion preheating coil 94, etc.) is rotated by a rotation driving device, a rotating shaft 95 or the like (not shown). However, the present invention is not limited to this. That is, the moving mechanism rotates and moves the preheating coil of the mounting table 90 so as to relatively move the preheating coil in the circumferential direction of the raw tire 4 along the raw tire 4 on the mounting table 90 (tire support means). What is necessary is just to have the structure provided with the moving means which performs at least one of turning movement.

  Moreover, as shown in FIG. 11, the partial preheating coil 111 can be disposed inside the raw tire 4. The difference from FIG. 10 is that the tread portion preheating coil 111 of the raw tire 4 is arranged inside the raw tire 4 so as to be along a part of the tread 4a. Since the other points are the same as those in FIG. 11, the same reference numerals are given and detailed description is omitted. The partial preheating coil 111 moves outward when the raw tire 4 is placed on the mounting table 90 and raised to the storage position (the solid line in the figure), and is moved to a part of the tread portion 4a of the raw tire 4. It arrange | positions inside the raw tire 4 so that it may follow.

  As shown in FIG. 10, when the partial preheating coil 101 is disposed outside the raw tire 4, the distance between the coil 101 and the metal belt member 56 may be long depending on the type of tire. However, unlike the thick tread layer on the outer side of the raw tire 4, the inner-liner portion on the inner surface side of the raw tire 4 has a sufficiently thin structure and little variation in thickness. Therefore, as shown in FIG. 11, by disposing the partial preheating coil 111 inside the raw tire 4 along a part of the tread portion 4a of the raw tire, the distance between the coil 111 and the metal belt member 56 is reduced. Thus, a sufficient alternating magnetic field can be applied to the belt member (metal member) 56.

  Further, in order to guide the high-frequency magnetic field formed by the partial preheating coil 111 to the metal belt member 56, the magnetic materials 112 and 112 can be arranged along a part of the tread portion 4a of the raw tire. . The alternating magnetic field generated around the partial preheating coil 111 passes through the metal belt member 56 inside the raw tire 4 through the magnetic materials 112 and 112, and therefore the magnetic flux density passing through the metal belt member 56 increases. A part of the belt member 56 in the circumferential direction of the tread portion 4a is efficiently induction-heated. At this time, since the raw tire 4 is rotated, the partial preheating coil 111 and the magnetic material 112 are relatively moved along the tread portion 4 a of the raw tire 4. Therefore, even when the partial preheating coil 111 heats a part of the tread portion 4a, the same state as when induction heating is performed by uniformly applying a high-frequency magnetic field over the entire tread portion 4a by rotation of the raw tire 4 become.

  Moreover, as shown in FIG. 12, the relative positional relationship between the partial preheating coil and the green tire can be changed. 10 is different from that of FIG. 10 in that the hydraulic servo actuators 125, 126, 127 in which the partial preheating coil 121, the lower bead part preheating coil 122, and the upper bead part preheating coil 123 are relative distance adjusting means, respectively. It is a point connected to. The other points are the same as those in FIG. 10, and the same reference numerals are given and detailed description thereof is omitted. By operating the hydraulic servo actuators 125, 126, 127, the partial preheating coil 121 can be moved in the radial direction of the raw tire 4, and the lower bead part preheating coil 122 and the upper bead part preheating are used. Each of the coils 123 can be moved in the vertical direction.

  Here, the magnetic flux density of the alternating magnetic field generated around the induction heating coil differs depending on the distance from the induction heating coil. Therefore, by moving each preheating coil and adjusting the distance from the raw tire, the magnetic flux density passing through each metal member can be appropriately adjusted according to the material configuration and shape of each metal member. Therefore, the raw tire can be efficiently heated.

  In FIG. 12, hydraulic servo actuators 125, 126, and 127 are used as the relative distance adjusting means. However, even if the design is changed as appropriate, for example, a mechanism combining a motor and a rack and pinion is used. Good. Further, here, the coils 121, 122, and 123 are moved with respect to the raw tire 4, but on the contrary, the raw tire 4 is provided with relative distance adjusting means, and the raw tire 4 is moved with respect to the coils 121, 122, and 123. It may be moved.

  Moreover, as shown in FIG. 13, the frequency in the partial preheating coil or the like can be changed. 10 is different from that shown in FIG. 10 in that a high frequency power supply circuit having a frequency changing means for the partial preheating coil 101 is shown. Since the other points are the same as those in FIG. 10, the same reference numerals are given and the detailed description is omitted. The high frequency power supply circuit 131 includes an AC power supply 132, a rectifier circuit 133, an inverter 134, a driver 135, a voltage detector 136, and a resonance capacitor 137.

  The AC power supply 132 is converted to DC by the rectifier circuit 133 and converted to AC power having a predetermined frequency by opening and closing the switching element of the inverter 134. Opening and closing of the switching element of the inverter 134 is controlled by the driver 135. That is, the driver 135 can change the frequency over a wide range. It is preferable that the AC power supply frequency can be changed preferably by 50 Hz to 100 KHz, more preferably from 10 to 30 KHz by the driver 135 which is a frequency changing means. Since the configuration of the metal belt member 56 varies depending on the size and type of the raw tire 4, the heat generation efficiency is improved by changing the frequency to an appropriate frequency according to the wire diameter and current penetration depth. Further, variation in heat generation of the belt member 56 can be suppressed.

  Since the belt member 56 is inside the insulator and is formed of a thin metal wire or metal plate, the cross-sectional area perpendicular to the magnetic field generated from the partial preheating coil 101 is small, and the induced eddy current hardly flows. That is, the power factor of the high frequency power supply circuit 131 is lowered. Therefore, it is desirable to connect a capacitor 137 that generates a resonance current in parallel or in series with the partial preheating coil 101. For example, when the switching frequency of the inverter 134 is f0, the capacitance of the capacitor 137 is determined so that the resonance frequency of the capacitor 137 is f1 = f0 × n (an integer greater than or equal to 2). Then, the current i1 flowing through the coil 101 is more than twice the current i0 in the inverter 134, the current amount of the wiring to the inverter 134 and the capacitor 137 is reduced and heat generation is suppressed, and the entire high frequency power supply circuit 131 is suppressed. Power factor is improved.

  Although the method for uniquely determining the resonance frequency f1 of the capacitor 137 from the frequency f0 of the inverter 134 has been described, as shown in the figure, a voltage detection unit 136 for detecting the voltage of the capacitor 137 is provided to cope with an arbitrary frequency of the inverter 134. It can be a method to do. The voltage at both ends of the capacitor 137 is measured in real time by the voltage detector 136, and the ON / OFF timing of the switching element of the inverter 134 is performed using the feedback value of the voltage value. Specifically, control is performed to turn on switching of the inverter in the vicinity of completion of one cycle of resonance between the capacitor 137 and the coil 101.

  Although the high frequency power supply circuit provided with the frequency changing means for the tread preheating coil 101 has been shown, the high frequency power supply circuit provided with the frequency changing means for the bead portion preheating coil may be formed. There is a similar effect.

  Further, referring to FIG. 14, a preferred form of induction heating will be described. 14 (a) and 14 (b) will be described in detail. The raw tire preheating device is arranged so as to follow the mounting table 140 on which the raw tire 4 is mounted and the tread portion 4a of the raw tire 4 on the mounting table 140. The tread part preheating coil 144 that generates a high frequency magnetic field and the bead part preheating coils 146 and 147 that generate the high frequency magnetic field are disposed along the bead parts 4c and 4c ′ of the raw tire 4. Yes. A rotation driving device (not shown) is connected to the center of the lower surface of the mounting table 140 via a rotation shaft 141, and the rotation driving device rotates the raw tire 4 together with the mounting table 140 in the horizontal direction when the raw tire 4 is stored. Let Further, a support member 142 is disposed above the mounting table 140, and a lifting device (not shown) is connected to the center of the upper surface of the support member 142 via a support shaft 143.

  The tread portion preheating coil 144 is disposed outside the raw tire 4 so as to be along a part of the tread portion 4 a of the raw tire 4. The tread portion preheating coil 144 is formed by winding a coil in a spiral shape, and a core (magnetic material) is disposed at the center thereof. The tread portion preheating coil 144 has a shape that follows the shape of the tread portion 4a. Here, it arrange | positions so that the direction of the magnetic field of the high frequency magnetic field formed around the coil 144 for tread part preheating may correspond to the direction in alignment with a part of circumferential direction of the metal belt members 56 of the tread part 4a.

  Further, the lower bead portion preheating coil 146 applies a high-frequency magnetic field to the bead wire 52 (metal member) of the lower bead portion 4c so that it follows the lower bead portion 4c slightly below the lower bead portion 4c. Is arranged. The lower bead portion preheating coil 146 is obtained by winding a coil into a spiral shape, and the spiral coil is configured by a wire winding portion in which coils are bundled so as to surround a central through portion. . Here, the wire winding portion is 60 mm or more and the width of the central through portion is about the same as that of the wire winding portion.

  On the other hand, the upper bead portion preheating coil 147 applies a strong high-frequency magnetic field to the bead wire 52 (metal member) of the upper bead portion 4c ′, so that the upper bead portion 4c ′ is slightly above the upper bead portion 4c ′. It is arranged along. The upper bead portion preheating coil 147 has the same shape as the lower bead portion preheating coil 146.

  One temperature sensor 148 is disposed on each of the outer surface and the inner surface of the tread portion of the raw tire 4. The temperature sensor 148 detects the temperatures of the outer surface and the inner surface of the raw tire 4 and thereby performs control such that the temperature of the metal belt member 56 of the tread portion 4a is estimated and maintained at a desired temperature. Is possible. Here, the number and the position of the temperature sensors arranged for detecting the surface temperature of the raw tire 4 may be appropriately changed. Furthermore, as the temperature sensor, either a contact type or a non-contact type may be used. In addition, the temperature sensor can be used not only for control but also for error detection. For example, the temperature rise (ΔT ° C.) 2 to 3 minutes after the start of preheating is determined, and it is determined whether or not the preheating state is good.

  Further, a guide roller 149 is installed so as to contact the outer surface of the raw tire 4. When the raw tire 4 rotates in the horizontal direction together with the mounting table 140 and the rotation support member 142 during storage, the outer surface of the raw tire 4 rotates while being guided by the guide roller 149. Moreover, the guide roller 149 can also be arrange | positioned so that the inner surface of a green tire may be contact | connected.

  Further, the tread portion preheating coil 144 is disposed so as to be sandwiched between the raw tire 4 and the raw tire 4 ′ installed on the opposite side of the raw tire 4, and each of the tread portions 4 a of the raw tire 4 and the raw tire 4 ′. And 4a ′.

  In the above configuration, when the raw tire 4 is stored, it is moved in the horizontal direction by a conveying device (not shown) and positioned above the mounting table 90, and then the support member 142 is lowered in the vertical direction above the mounting table 140. Place. Thereafter, the mounting table 140 and the raw tire 4 are rotated in the horizontal direction via the rotating shaft 141 by a rotation driving device (not shown), and high-frequency power is supplied from a high-frequency power source (not shown) to the preheating coils 144, 146, and 147. .

  The tread portion preheating coil 144 supplied with the high frequency power efficiently inductively heats the belt member 56 of the tread portion 4a by applying a high frequency magnetic field to the tread portion 4a with a high magnetic flux density. In particular, when a high frequency magnetic field is formed in the circumferential direction with respect to the metal belt member 56 of the tread portion 4a, the high frequency magnetic field is formed along the metal belt member 56. The magnetic flux density passing through the belt member 56 increases, and a part of the tread portion 4a in the circumferential direction of the belt member 56 can be efficiently induction-heated.

  On the other hand, each bead part preheating coil 146, 147 efficiently induction heats the bead wire 52 of each bead part 4c, 4c 'by applying a high frequency magnetic field to each bead part 4c, 4c' at a high magnetic flux density. To do. In particular, when the spiral bead part preheating coils 146 and 147 are used, a high-frequency magnetic field is formed along the circumferential direction of the bead wire 52 (metal member) of the lower bead part 4c and the upper bead part 4c ′. . Therefore, even when the outer surface of the green tire and the coil are separated from each other, a sufficient alternating magnetic field should be applied to the bead wires 52 of the large-thickness bead portions 4c and 4c ′ that are particularly delayed in temperature during vulcanization molding. Is possible.

  Since the raw tire 4 is rotated in the horizontal direction, the tread portion preheating coil 144, the lower bead portion preheating coil 146, and the upper bead portion preheating coil 147 are relatively moved along the raw tire 4. . Therefore, the preheating coils 144, 146, and 147 apply non-uniform high-frequency magnetic fields to the tread portion 4a, lower bead portion 4c, and upper bead portion 4c ′ of the raw tire 4 due to low assembly accuracy and processing accuracy. Even in this case, the high frequency magnetic field can be uniformly applied over the entire raw tire 4 to perform induction heating. Thereby, since it is not necessary to assemble and process the preheating coils 144, 146, and 147 with high accuracy, the assembling operation and the processing operation can be facilitated.

  Further, by providing a guide roller capable of guiding the outer surface of the raw tire 4, the relative distance between the metal belt member 56 of the tread portion 4a and the tread portion preheating coil 144 is kept constant, and the belt member. Since the magnetic flux density of the magnetic field passing through 56 can be kept constant, the temperature unevenness of the heating section can be reduced.

  Further, the tread portion preheating coil 144 is disposed so as to be sandwiched between the raw tire 4 and the raw tire 4a ′, and is rotated so that the tread portions 4a and 4a ′ of the raw tire 4 and the raw tire 4a ′ are metal. The manufactured belt member 56 can be induction-heated simultaneously. It is also possible to control a plurality of raw tire preheating devices collectively by connecting a plurality of coils to one high-frequency power source. With the above configuration, since it is not necessary to separately install a high frequency power source and a coil for each raw tire preheating device, it is possible to reduce the cost of the raw tire preheating device.

The first invention is a raw tire preheating method, in which a raw tire is inflated and held by a holding mechanism before vulcanization molding of a raw tire in which a metal member is embedded inside the tire , and the metal the manufacturing members induction heating and before molding vulcanization, is configured to store while preheating the green tire by the induction heating. According to the above configuration, since the metal member is induction-heated before vulcanization molding, it is possible to preheat while preferentially heating the tire inner side where the temperature rise is most delayed during vulcanization molding. There is an effect that the molding can be completed in a short time. In addition, it is possible to prevent the raw tire from being deformed and to prevent the support center from being displaced.
The second invention is a raw tire preheating method, in a storage warehouse having a plurality of storage units for storing raw tires before vulcanization molding of the raw tires in which a metal member is embedded inside the tire, Between the induction heating of the metal member and the vulcanization molding, the raw tire is stored while being preheated by the induction heating. According to the above configuration, since the metal member is induction-heated before vulcanization molding, it is possible to preheat while preferentially heating the tire inner side where the temperature rise is most delayed during vulcanization molding. There is an effect that the molding can be completed in a short time. In addition, the green tire can be temporarily stored according to the production plan before vulcanization molding.

At least one of the ◆ third invention, the first invention or a green tire preheating method of the second invention, the tread portion, bead portion and the metallic member embedded within the tire sidewall portion Is configured to be induction-heated. According to the above configuration, since the inside of the tire in the tread portion and / or the bead portion having a particularly large thickness can be preheated, the effect that the vulcanization molding can be completed more reliably in a short time is obtained. Play.
The fourth invention is a raw tire preheating device for preheating a raw tire embedded with a metal member inside the tire, the holding mechanism for inflating and holding the raw tire, and the raw tire A tire support unit that is detachably supported in a predetermined posture, and a coil that induction-heats the metal member of the raw tire by the high frequency magnetic field by applying a high frequency magnetic field to the raw tire supported by the tire support unit The raw tire is inflated and held by the holding mechanism, and is stored while preheating the raw tire by the induction heating until it is vulcanized. According to said structure, a metal member can be induction-heated with the high frequency magnetic field of a coil means, attaching a green tire to a tire support means and storing temporarily before vulcanization molding. Therefore, since the tire inner side where the temperature rise is most delayed during vulcanization can be preheated while being preferentially heated, vulcanization molding can be completed in a short time. In addition, it is possible to prevent the raw tire from being deformed and to prevent the support center from being displaced.
The fifth invention is a raw tire preheating device for preheating a raw tire in which a metal member is embedded in the tire, and a storage warehouse having a plurality of storage units for storing the raw tire, In the storage unit, a tire support means for placing either the raw tire inflated and held by the holding mechanism or only the raw tire and detachably supporting the raw tire in a predetermined posture, and supported by the tire support means Coil means for inductively heating the metallic member of the raw tire by the high-frequency magnetic field by applying a high-frequency magnetic field to the formed raw tire, and the raw tire is inflated and held by the holding mechanism. In addition, the raw tire is stored while being preheated by the induction heating until vulcanization molding is performed. According to the said structure, a metal member can be induction-heated with the high frequency magnetic field of a coil means, attaching a green tire to a tire support means and temporarily storing it before vulcanization molding. Therefore, since the tire inner side where the temperature rise is most delayed during vulcanization can be preheated while being preferentially heated, vulcanization molding can be completed in a short time. In addition, the green tire can be temporarily stored according to the production plan before vulcanization molding.
The sixth invention is a raw tire preheating device according to the fourth or fifth invention, wherein the coil means is a metal member embedded in the tire in the tread part, bead part and side wall part. It is the structure which induction-heats at least one of them. According to the above configuration, since the inside of the tire in the tread portion and / or the bead portion having a particularly large thickness can be preheated, there is an effect that the vulcanization molding can be completed more reliably in a short time. .

◆ A seventh invention is a green tire preheating method of the third invention, is configured to induction heating the metal member embedded in the inside of the tread portion from the inside of the raw tire. According to the above configuration, the thickness of the inside of the raw tire is sufficiently thin with little variation in the type of tire, so that the distance between the coil means for induction heating and the metal member is reduced, and a sufficient alternating magnetic field is generated from the metal. It becomes possible to apply to the member, and there is an effect that the metal member can be efficiently induction-heated.

◆ An eighth invention is a green tire preheating method of the first to third invention, the induction heating is performed by a coil for generating a high frequency magnetic field, the frequency of the high frequency magnetic field, the green tire inside the metallic member The configuration is changed according to the configuration. According to the above configuration, the configuration of the metal member embedded in the tire varies depending on the type or size of the tire, and the appropriate frequency can be changed according to the wire diameter or current penetration depth. It is possible to efficiently induction-heat metal members. As a result, there is an effect that the tire can be sufficiently preheated in the tread portion and / or the bead portion having a large thickness, in which the temperature rise is particularly delayed during vulcanization molding.

◆ A ninth invention is a green tire preheating method of the first to third invention, the induction heating is performed by a coil for generating a high-frequency magnetic field, the coil and the relative distance of the raw tire, the green tire inside the metal It is the structure adjusted according to the structure of a manufacturing member. According to said structure, since the magnetic flux density which passes a metal member can be adjusted according to the material structure or shape of a metal member, it is possible to induction-heat a metal member efficiently. As a result, there is an effect that the tire can be sufficiently preheated in the tread portion and / or the bead portion having a large thickness, in which the temperature rise is particularly delayed during vulcanization molding.

◆ A tenth invention is a green tire preheating method of the first to third invention and before shaping vulcanization, is configured to kept the finished green tire induction heating and in heating. According to said structure, while reducing the temperature by the heat radiation from the raw tire preheated by carrying out induction heating of the metal members inside a raw tire, there exists an effect of improving the thermal uniformity of a raw tire.

◆ An eleventh invention is a green tire preheating apparatus, a green tire preheating apparatus which performs preheating the raw tire metal member is embedded inside the tire, removably green tire at a predetermined position The structure includes tire supporting means for supporting, and coil means for inductively heating a metal member of the raw tire by a high frequency magnetic field by applying a high frequency magnetic field to the raw tire supported by the tire supporting means. According to said structure, a metal member can be induction-heated with the high frequency magnetic field of a coil means, attaching a green tire to a tire support means and storing temporarily before vulcanization molding. Therefore, since the tire inner side where the temperature rise is most delayed during vulcanization can be preheated while being preferentially heated, vulcanization molding can be completed in a short time.

◆ twelfth invention is the green tire preheating apparatus of the eleventh invention, the raw tire, the metal member are embedded respectively in the interior of the tire at least the tread portion and the bead portion, the coil means, the green tire The tread part preheating coil means that is arranged along the tread part of the tire and generates a high frequency magnetic field, and the bead part preheating coil means that is arranged along the bead part of the raw tire and generates a high frequency magnetic field It is. According to said structure, the tread part preheating coil means arrange | positioned along the tread part of a green tire applies a high frequency magnetic field with high magnetic flux density with respect to a tread part, The metal member of a tread part is made. Efficient induction heating. On the other hand, the bead part preheating coil means arranged along the bead part of the raw tire applies a high frequency magnetic field to the bead part with a high magnetic flux density, thereby efficiently induction-heating the metal member of the bead part. . As a result, there is an effect that it is possible to sufficiently perform preheating inside the tire of the large-thick tread portion and bead portion that are particularly delayed in temperature increase during vulcanization molding.

◆ A thirteenth invention is a green tire preheating apparatus of the eleventh invention, the raw tire, the metal member are embedded respectively in the interior of the tire at least the tread portion and the bead portion, the coil means, the green tire And a columnar preheating coil formed and arranged so that both end portions are positioned at both bead portions of the raw tire. According to the above configuration, the high-frequency magnetic field generated from the columnar preheating coil inserted through the tire hole inductively heats the metal member in the tread portion and the metal member in the bead portion. It is possible to sufficiently preheat the tire inside the tread portion and bead portion having a large wall thickness where the temperature is delayed. Furthermore, since the metal member of the tread portion and the bead portion can be induction-heated with only one columnar preheating coil, there is an effect that the component cost and the assembly cost can be reduced.

◆ A fourteenth invention is a one of the raw tire preheating apparatus of the eleventh invention to the thirteenth, a configuration in which a high-frequency magnetic field was placed a magnetic material for guiding the metal member by said coil means. According to the above configuration, since the high frequency magnetic field generated by the coil means passes through the metal member and converges to the magnetic material, the magnetic flux density passing through the metal member is increased, and vulcanization is performed. In particular, there is an effect that the tire can be sufficiently preheated at the tread portion and the bead portion having a large thickness, in which the temperature rise is delayed at the time of molding.

The fifteenth aspect of the present invention is the raw tire preheating device according to the eleventh aspect of the present invention, wherein the coil supporting means is moved relative to the raw tire in the circumferential direction along the raw tire supported by the tire supporting means. It is the structure which has a moving means to perform at least one of the rotational movement of this, and the turning movement of a coil means. According to the above configuration, since the coil means relatively moves along the raw tire, even if the coil means applies a strong high-frequency magnetic field to a part of the raw tire due to low assembling accuracy or processing accuracy. In addition, a strong high-frequency magnetic field can be applied uniformly over the entire raw tire for induction heating. Therefore, the coil means can be reduced in size, and the coil means can be easily assembled.

◆ sixteenth invention, eleventh to thirteenth invention, be any of the raw tire preheating apparatus of the eleventh aspect, the high frequency power supply for generating a high frequency magnetic field for the coil means to the frequency variable This is a configuration provided with frequency changing means. According to the above configuration, the configuration of the metal member embedded in the tire varies depending on the type or size of the tire, and the appropriate frequency can be changed according to the wire diameter or current penetration depth. It is possible to efficiently induction-heat metal members. As a result, there is an effect that it is possible to sufficiently perform preheating inside the tire of the large-thick tread portion and bead portion that are particularly delayed in temperature increase during vulcanization molding.

◆ The seventeenth aspect of the invention is the raw tire preheating apparatus of the sixteenth aspect of the invention, wherein the coil means is connected to a capacitor that generates a resonance current. According to the above configuration, since the resonance circuit is formed by the capacitor, the heat generation efficiency of the entire apparatus is improved, the power factor can be improved, and the metal member can be efficiently induction-heated. . As a result, there is an effect that it is possible to sufficiently perform preheating inside the tire of the large-thick tread portion and bead portion that are particularly delayed in temperature increase during vulcanization molding.

◆ eighteenth aspect of the present invention, the eleventh to thirteenth invention, be any of the raw tire preheating apparatus of the sixteenth aspect, with respect to the metal member embedded within the tire, freely close to and away from the coil means It is the structure which has a relative distance adjustment means so that adjustment is possible. According to the above configuration, it is possible to adjust the magnetic flux density passing through the metal member according to the material configuration or shape of the metal member, and thus it is possible to efficiently induction heat the metal member. is there. As a result, there is an effect that it is possible to sufficiently perform preheating inside the tire of the large-thick tread portion and bead portion that are particularly delayed in temperature increase during vulcanization molding.

◆ nineteenth aspect of the present invention, a green tire preheating apparatus of the invention of a 15, moving as the tire center axis of the green tire supported on the tire supporting means is the rotational center, is rotated moving the tire support means It has a rotational movement mechanism, and a coil means is a structure which has the coil for partial preheating which is arrange | positioned along a part of the tread part and / or bead part of a raw tire, and produces | generates a high frequency magnetic field. According to said structure, since the coil for partial preheating can be formed by small size, there exists an effect that a preheating apparatus can be reduced in size.

◆ twentieth invention is a green tire preheating apparatus of the nineteenth invention, the coil means forming part preheat for said tread portion, a structure disposed on the inside of the raw tire. According to the above configuration, the inside of the green tire is sufficiently thin with little variation in thickness depending on the type of tire, so the distance between the tread portion preheating coil means and the metal member is reduced. It is possible to apply a sufficient alternating magnetic field to the metal member, and the metal member can be efficiently induction-heated.

It is typical sectional drawing of the side surface of the vulcanizer in the storage process which concerns on one embodiment of this invention. It is the schematic which shows the tire manufacturing process which concerns on one embodiment of this invention. It is typical sectional drawing of the side surface of the vulcanizer (at the time of raw tire carrying-in) in the vulcanization | cure process which concerns on one embodiment of this invention. It is typical sectional drawing of the side surface of the vulcanizer (at the time of green tire mold clamping) in the vulcanization | cure process which concerns on one embodiment of this invention. It is typical sectional drawing of the side surface of the vulcanizer (at the time of green tire mold clamping completion) in the vulcanization | cure process which concerns on one embodiment of this invention. 1 is a schematic cross-sectional view of a tire mold and a raw tire during vulcanization. It is a disassembled perspective view which shows the principal part of a green tire. It is explanatory drawing which shows the state stored while preheating a raw tire at a storage process, (a) is the state seen planarly, (b) is the state of the XX arrow cross section of (a). It is explanatory drawing which shows the state stored while preheating a raw tire at a storage process, (a) is the state seen planarly, (b) is the state of the XX arrow cross section of (a). It is explanatory drawing which shows the state stored while preheating a raw tire at a storage process, (a) is the state seen planarly, (b) is the state of the XX arrow cross section of (a). It is explanatory drawing which shows the state stored while preheating a raw tire at a storage process, (a) is the state seen planarly, (b) is the state of the XX arrow cross section of (a). It is explanatory drawing which shows the state stored while preheating a raw tire at a storage process, (a) is the state seen planarly, (b) is the state of the XX arrow cross section of (a). It is explanatory drawing which shows the state stored while preheating a raw tire at a storage process, (a) is the state seen planarly, (b) is the state of the XX arrow cross section of (a). It is explanatory drawing which shows the state stored while preheating a raw tire at a storage process, (a) is the state seen planarly, (b) is the state of the XX arrow cross section of (a).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vulcanizer 2 Mold fixing part 3 Mold raising / lowering part 4 Raw tire 5 Lower side mold 6 Lower platen 10 Center mechanism 12 Lower ring 18 First induction heating coil 19 Upper ring 20 Bladder 22 Center post 23 Second induction heating coil 24 High frequency Power source 25 Upper side mold 26 Split mold 27 First mold lifting mechanism 28 Upper heating mechanism 29 Second mold lifting mechanism 39 Fourth induction heating coil 41 Third induction heating coil 61 Tire molding machine 62 First drive device 63 Second drive device 64 First chuck mechanism 65 Second chuck mechanism 71 Holding mechanism 80 Storage warehouse 81 Storage unit 83 Preheating induction heating coil 90 Mounting table 91 Tread unit preheating coil 92 Lower bead unit preheating coil 94 Upper bead unit preheating coil 95 Rotation Shaft 98 Rotating support shaft 99 Columnar preheating Coil 100 Upper bead part preheating coil 101 Partial preheating coil 102 High frequency power supply

Claims (6)

Before the vulcanization molding of the raw tire in which the metal member is embedded inside the tire, the raw tire is inflated and held by a holding mechanism, and the metal member is induction-heated,
A raw tire preheating method, wherein the raw tire is stored while being preheated by induction heating before vulcanization molding. Before vulcanization of the green tire metal member is embedded inside the tire, the storage warehouse having a plurality of storage portions storing the green tire, and induction heating the metal member,
A raw tire preheating method, wherein the raw tire is stored while being preheated by induction heating before vulcanization molding. The raw tire preheating method according to claim 1 or 2 , wherein at least one of metallic members embedded in the tire in the tread portion, the bead portion, and the sidewall portion is induction-heated. A raw tire preheating device for preheating a raw tire in which a metal member is embedded inside the tire,
A holding mechanism for inflating and holding the raw tire;
Tire support means for detachably supporting the raw tire in a predetermined posture;
Coil means for inductively heating the metallic member of the raw tire by the high frequency magnetic field by applying a high frequency magnetic field to the raw tire supported by the tire supporting means;
Have
A raw tire preheating apparatus, wherein the raw tire is inflated and held by the holding mechanism and stored while preheating the raw tire by the induction heating until vulcanization molding is performed. A raw tire preheating device for preheating a raw tire in which a metal member is embedded inside the tire,
A storage warehouse having a plurality of storage units for storing the raw tires;
In each storage unit, a tire support means for placing either a raw tire inflated and held by a holding mechanism or only a raw tire and detachably supporting the raw tire in a predetermined posture;
Coil means for inductively heating the metal member of the raw tire by the high frequency magnetic field by applying a high frequency magnetic field to the raw tire supported by the tire supporting means;
Have
A raw tire preheating device, wherein the raw tire is inflated and held by the holding mechanism and is stored while preheating the raw tire by the induction heating until vulcanization molding is performed. 6. The raw tire preheating according to claim 4 , wherein the coil means performs induction heating of at least one of metallic members embedded in a tire in a tread portion, a bead portion, and a sidewall portion. apparatus.

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