JP2011042084A - Tire vulcanizing apparatus and tire vulcanizing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tire vulcanizing apparatus and method, which surely reduces bare defects due to air remaining between a raw tire and a mold while suppressing cost increase when forming vent holes in the mold. <P>SOLUTION: The tire vulcanizing apparatus 1 is equipped with a plurality of molds (sector mold 30, upper side mold 33, and lower side mold 31) in which an unvulcanized raw tire TR having a steel member is formed and in which vent holes 60-63 are formed communicating from the surface in contact with the raw tire TR to the outside. At least in some molds, electromagnets 50-52 that generate a magnetic force for attracting the steel member, are equipped. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a tire vulcanizing apparatus and a tire vulcanizing method, and more particularly, to a tire vulcanizing apparatus and a tire vulcanizing method that can reduce a bear defect during vulcanization.

  Conventionally, a pneumatic tire manufacturing process includes a vulcanizing process for vulcanizing a raw tire (so-called green tire). In this vulcanization step, a tire vulcanizing apparatus including a plurality of sector molds that form a tread portion of a green tire and a side mold that forms a side portion of the green tire is used. The sector mold and the side mold (hereinafter simply referred to as a mold) are formed with vent holes that communicate from the surface of the mold that contacts the green tire to the outside.

  In the vulcanization process described above, after setting a raw tire in a tire vulcanizer, air inside the tire vulcanizer is discharged to the outside by a vacuum device (for example, a vacuum pump) (for example, a patent) Reference 1). Thereby, generation | occurrence | production (so-called bear defect) of the dent of a tread part by air remaining between a green tire and a mold can be suppressed.

JP-A-11-58388

  However, the conventional tire vulcanizing apparatus described above has a problem in that the vacuum apparatus has a complicated configuration, resulting in high costs.

  Therefore, an object of the present invention is to add a tire that can more reliably reduce bear defects caused by air remaining between a green tire and a mold while suppressing cost increase when a vent hole is formed in the mold. An object of the present invention is to provide a vulcanizing apparatus and a tire vulcanizing method.

  A first feature of the present invention is that a vent hole (vent holes 60 to 63) that forms an unvulcanized raw tire (raw tire TR) having a steel member and communicates from the surface in contact with the raw tire to the outside. Is a tire vulcanizer (tire vulcanizer 1) including a plurality of molds (sector mold 30, upper side mold 33, and lower side mold 31), and at least one of the molds includes The gist is that an electromagnet (electromagnets 50 to 52) that generates a magnetic force to attract the steel member is provided.

  Thus, at least one of the molds is provided with an electromagnet that generates a magnetic force that attracts the steel member. For this reason, the green tire is attracted to the mold by the steel member of the green tire. As a result, the air remaining between the green tire and the mold passes through the vent hole and is discharged to the outside, so that the green tire is easily adapted to the mold. Accordingly, it is possible to more reliably reduce bear defects caused by air remaining between the green tire and the mold. In addition, since the electromagnet has a simple configuration as compared with a general vacuum device (for example, a vacuum pump), the cost can be suppressed.

  A second feature of the present invention relates to the first feature of the present invention, wherein the steel member includes a bead portion (bead portion 100A), a carcass layer (carcass layer 100B), and a belt layer (belt layer 100C). The mold has an arc shape, and a plurality of sector molds (sector mold 30) for forming a tread portion of the green tire, and a plurality of side molds (upper side mold 33) for forming a side portion of the green tire. And a lower side mold 31), and the electromagnet is provided in the sector mold, and is provided in the side mold, a sector electromagnet (electromagnet 52) that generates a magnetic force that attracts the carcass layer and the belt layer, Side electromagnets (electromagnets 51, 51 that generate magnetic force that attracts the bead portion and the carcass layer. And summarized in that a and.

  A third feature of the present invention relates to the second feature of the present invention, wherein the sector electromagnet extends along a direction corresponding to a tread width direction of the green tire, and the side electromagnet is the green tire. The main point is that the tire extends along a direction corresponding to the tire radial direction.

  A fourth feature of the present invention relates to the first to third features of the present invention, in which the electromagnet includes electric power between the time when the green tire is set in the tire vulcanizer and the time when it is vulcanized. Is a summary.

  According to a fifth aspect of the present invention, there is provided a tire vulcanization that includes a plurality of molds that form an unvulcanized raw tire having a steel member and that have vent holes that communicate from the surface in contact with the raw tire to the outside. A tire vulcanizing method for vulcanizing the raw tire using an apparatus, wherein the raw tire is set in the tire vulcanizing apparatus and the electromagnet provided in at least one of the molds. In the step B of generating a magnetic force that attracts the steel member from the electromagnet by supplying, and the step B, the raw tire is attracted to the mold by the magnetic force.

  According to the present invention, in a case where a vent hole is formed in a mold, a tire vulcanizing apparatus that can more reliably reduce a bear defect due to air remaining between a green tire and a mold while suppressing an increase in cost. And a tire vulcanizing method.

1 is a front view showing a tire vulcanizing apparatus according to an embodiment of the present invention. It is a perspective view which shows the state which the sector mold by embodiment of this invention opened. FIG. 3 is a perspective view showing a state where the sector mold of FIG. 2 is closed. It is sectional drawing of the mold and tire during tire vulcanization.

  Hereinafter, details of a tire vulcanizing apparatus according to an embodiment of the present invention will be described with reference to the drawings. However, it should be noted that the drawings are schematic, and the thicknesses and ratios of the material layers are different from actual ones. Therefore, specific thicknesses and dimensions should be determined in consideration of the following description. Moreover, the part from which the relationship and ratio of a mutual dimension differ also in between drawings is contained.

(Tire vulcanizer)
FIG. 1 is a front view showing a tire vulcanizing apparatus according to an embodiment of the present invention.

  The vulcanizer 1 includes a base support part 11, a lower base 12, an upper base 13, and a support rod 14. The base support 11 is installed on the foundation B. The lower base 12 has a square shape and is supported by the base support portion 11. The lower base 12 is disposed horizontally with respect to the foundation B.

  The support rod 14 has a predetermined length. The support rod 14 is disposed along the vertical direction. The vulcanizer 1 has four support rods 14. The four support rods 14 are respectively arranged at the four corners of the lower base 12.

  An upper base 13 is attached to the upper end portion of the support rod 14. The four support rods 14 support the upper base 13.

  The upper base 13 has substantially the same shape as the lower base 12. The upper base 13 is separated from the lower base 12 by a predetermined distance. The upper base 13 is formed with insertion holes 13a and 13b through which a piston rod 41 and a guide rod 43 described later are inserted. The upper base 13 is disposed horizontally with respect to the foundation B.

  An opening 12 a is provided at the center of the lower base 12. A bladder device 20 is installed in the opening 12a. The bladder device 20 is installed to be movable up and down in the vertical direction.

  The bladder device 20 includes a bladder 21, a piston rod 22, a control cylinder 23, and a supply / exhaust pipe 24.

  The bladder 21 is formed of a flexible material (for example, butyl rubber). An upper end 21 a of the bladder 21 is fixed to the upper clamp 25. The lower end 21 b of the bladder 21 is fixed to the lower clamp 26. An unadded raw tire TR is placed on the outside of the bladder 21. The bladder 21 is fed with heated and pressurized fluid R. The bladder 21 is inflated inside the raw tire TR by the fluid R that has been sent in to form a donut shape.

  The central axis of the piston rod 22 is arranged along the vertical direction, that is, along the direction perpendicular to the foundation B. A control cylinder 23 is connected to the lower end of the piston rod 22. The piston rod 22 and the control cylinder 23 are disposed along the approximate center of the lower base 12.

  The control cylinder 23 is provided below the piston rod 22. The control cylinder 23 controls the movement of the piston rod 22. That is, the control cylinder 23 moves the piston rod 22 along the vertical direction (arrow V).

  The supply / discharge pipe 24 is connected to the lower clamp 26. The supply / discharge pipe 24 introduces a fluid R set to a predetermined temperature and a predetermined pressure into the bladder 21. Alternatively, the introduced fluid R is discharged. The fluid R is heated or pressurized steam, nitrogen gas, or the like. The supply / discharge pipe 24 is connected to an introduction device (not shown).

  The vulcanizing apparatus 1 includes a plurality of molds that form the raw tire TR and have vent holes that communicate from the surface in contact with the raw tire TR to the outside. Specifically, the vulcanizing apparatus 1 includes a sector mold 30, a lower side mold 31, and an upper side mold 33. The sector mold 30 and the lower side mold 31 are arranged around the bladder device 20 of the lower base 12.

  The sector mold 30 is a mold for forming the tread portion TR1 (see FIG. 4) of the raw tire TR. The sector mold 30 is a mold having an arc shape and forming a tread pattern on the tread portion TR1 of the raw tire TR.

  The lower side mold 31 and the upper side mold 33 mold the sidewall portion of the raw tire TR. The lower side mold 31 is a mold for molding one sidewall portion TR2 (see FIG. 4) of the raw tire TR. The upper side mold 33 is a mold for molding one sidewall portion TR3 (see FIG. 4) of the raw tire TR.

  The sector mold 30, the lower side mold 31, and the upper side mold 33 are provided with a heating unit (not shown) such as a heater.

  The vulcanizing apparatus 1 has a moving unit 32 that moves the sector mold 30. The moving unit 32 has a predetermined movable range. The moving part 32 moves the sector mold 30 along the tire radial direction of the raw tire TR placed on the vulcanizer 1 (arrow H). In FIG. 1, the sector mold 30 is located at the outer limit of the movable range in the tire radial direction. That is, the movement part 32 comprises an expansion / contraction mechanism.

  The vulcanizing device 1 has a plate 40. The plate 40 is disposed between the lower base 12 and the upper base 13. Support rods 14 are inserted into the four corners of the plate 40.

  The vulcanizer 1 includes a piston rod 41, a control cylinder 42, and a guide rod 43 as a mechanism for moving the plate 40 up and down. The piston rod 41 is inserted through an insertion hole 13 a provided at a substantially central portion of the upper base 13. The guide rod 43 is inserted through an insertion hole 13 b provided at a predetermined position of the upper base 13.

  The piston rod 41 is connected to the substantially central portion of the plate 40. The guide rod 43 is connected to a predetermined position of the plate 40. The piston rod 41 can be moved in the vertical direction (arrow V) with respect to the foundation B by the control cylinder 42. Accordingly, the plate 40 is moved along the support rod 14. In FIG. 1, the plate 40 is located at the upper limit in the vertical direction.

  An outer ring 34 is disposed on the lower surface of the plate 40. The outer ring 34 has an annular shape. The inner diameter of the ring is substantially the same as the outer shape of the sector mold 30 when a plurality of sector molds 30 are combined. The ring center of the outer ring 34 is coaxial with the center axis of the bladder device 20. The outer ring 34 regulates the expansion / contraction range of the sector mold 30.

  The vulcanizing device 1 has a side plate 44. The side plate 44 is attached to the plate 40 via the support rod 45. An upper side mold 33 is provided on the side plate 44. The upper side mold 33 molds the sidewall of the raw tire TR.

  The upper side mold 33 is a mold for forming a tire side surface portion along the tire radial direction of the unvulcanized raw tire TR. The upper side mold 33 has a heating part (not shown).

  In this embodiment, the base support part 11, the lower base 12, the upper base 13, the support rod 14, the plate 40, and the piston rod 41 constitute a container part. That is, the outer ring 34 disposed on the plate 40 and the sector mold 30 movably installed on the lower base 12 are included in the container portion.

  FIG. 2 is a perspective view illustrating a state where the sector mold is opened according to an embodiment of the present invention, and FIG. 3 is a perspective view illustrating a state where the sector mold of FIG. 2 is closed.

  The sector mold 30 is a mold for forming a tread portion of the raw tire TR, and is divided into a plurality (for example, nine) along the tire circumferential direction. The sector mold 30 is circumferentially arranged on the lower base 12 of the vulcanizing apparatus 1 via the moving unit 32.

  FIG. 2 shows an arrangement state of each sector mold 30 when the unvulcanized raw tire TR is placed inside the vulcanizing device or when the vulcanized tire is taken out from the inside of the vulcanizing device. In FIG. 3, the arrangement | positioning state of each sector mold 30 at the time of vulcanization | cure is shown. The direction of arrow V shown in FIG. 2 is the same as the direction of arrow V in FIG.

  As shown in FIGS. 2 and 3, the sector mold 30 expands and contracts along a radial line L that passes through the midpoint M of the inner peripheral surface of the sector mold 30 and the center line CL of the ring formed by the plurality of sector molds 30. That is, the sector mold 30 expands and contracts along the H direction.

  The unvulcanized green tire TR is placed around the bladder device 20 of the vulcanizing device 1. A carcass portion (not shown) of the unvulcanized green tire TR is fixed to the upper clamp 25 and the lower clamp 26.

  The vulcanizing device 1 pushes down the piston rod 41 by the control cylinder 42. Thereby, the plate 40 descends. That is, the outer ring 34 attached to the lower surface of the plate 40 is lowered toward the lower base 12. Further, as the plate 40 is lowered, the upper side mold 33 provided on the side plate 44 is lowered.

  The sector mold 30 moves from the outer side in the tire radial direction toward the center in synchronization with the lowering operation of the outer ring 34. The outer ring 34 comes into contact with the sector mold 30 and further descends to the lower limit of movement.

  FIG. 4 is a cross-sectional view of the mold and the green tire during tire vulcanization.

  As shown in FIG. 4, the unvulcanized raw tire TR is accommodated in a vulcanization space formed between the bladder 21, the sector mold 30, the lower side mold 31, and the upper side mold 33. Is done. The raw tire TR includes a bead portion 100A (core), a carcass layer 100B (cord), and a belt layer 100C (cord) that constitute a steel member attracted to a magnet. The raw tire TR has a tread portion TR1, a sidewall portion TR2, and a sidewall portion TR3. In addition, the lower side mold 31 and the upper side mold 33 form the sidewall portions TR2 and TR3 of the raw tire TR, respectively.

  The sector mold 30 has a tread pattern forming surface 30a on which irregularities for forming a tread pattern are formed, and an inclined surface 30b. The tread pattern forming surface 30 a forms the inner peripheral surface of the sector mold 30. In the sector mold 30, the length of the end attached to the moving part 32 is longer than the length of the upper end in the cross section in the tire width direction.

  The sector mold 30 is embedded with an electromagnet 52 (sector electromagnet) that generates a magnetic force that attracts the steel members, that is, the carcass layer 100B and the belt layer 100C. The electromagnet 52 extends along a direction corresponding to the tread width direction of the raw tire TR. In the present embodiment, the electromagnet 52 has a flat plate shape extending along the inclined surface 30b in the vicinity of the inclined surface 30b. The electromagnet 52 is connected to a power source via a wiring not shown.

  The sector mold 30 is formed with vent holes 61 and 62 penetrating from the surface in contact with the tread portion TR1 of the raw tire TR to the outside (lateral direction in the drawing). These vent holes 61 and 62 communicate the interior of the vulcanization space with the outside air, and act to discharge the air in the vulcanization space to the outside air or to introduce the air of the outside air into the vulcanization space. Have

  The lower side mold 31 has a sidewall forming surface 31a that forms the sidewall portion TR2 of the green tire TR. The lower side mold 31 is provided with an electromagnet 51 (side electromagnet) that generates a magnetic force that attracts the steel members, that is, the bead portion 100A and the carcass layer 100B. The electromagnet 51 extends along a direction corresponding to the tire radial direction of the raw tire TR. In the present embodiment, the electromagnet 51 has a flat plate shape extending in the lateral direction at the lower end portion of the lower side mold 31.

  Further, the lower side mold 31 is formed with a vent hole 63 penetrating from the surface in contact with the sidewall portion TR2 of the raw tire TR to the outside (vertical direction in the drawing).

  Further, the upper side mold 33 has a sidewall forming surface 33a that forms the sidewall portion TR3 of the raw tire TR. The upper side mold 33 is provided with an electromagnet 50 (side electromagnet) that generates a magnetic force that attracts the steel members, that is, the bead portion 100A and the carcass layer 100B. The electromagnet 50 extends along a direction corresponding to the tire radial direction of the raw tire TR. In the present embodiment, the electromagnet 50 has a flat plate shape extending in the lateral direction at the upper end portion of the upper side mold 33.

  Further, the upper side mold 33 is formed with a vent hole 60 penetrating from the surface in contact with the sidewall portion TR3 of the raw tire TR to the outside (vertical direction in the drawing).

  The outer ring 34 has an inclined surface 34a that contacts the inclined surface 30b. In the cross section in the tire width direction of the outer ring 34, the length of the end attached to the lower surface of the plate 40 is longer than the length of the lower end.

(Tire vulcanization method)
Next, the procedure of the tire vulcanizing method according to the present embodiment will be briefly described.

  First, an unvulcanized raw tire TR is set in the molds 30, 31, 33 (tire vulcanizing apparatus 1). Thereafter, when the outer ring 34 is lowered in the downward direction of the arrow V, the inclined surface 34a of the outer ring 34 and the inclined surface 30b of the sector mold 30 slide.

  As a result, the sector mold 30, the lower side mold 31, and the upper side mold 33 move toward the raw tire TR, and the sector mold 30, the lower side mold 31, and the upper side mold 33 are mutually strong. A closed vulcanization space is formed by being in close contact with each other.

  Next, by supplying electric power to the electromagnets 50 to 52 provided in the respective molds 30, 31, and 33, a magnetic force that attracts the bead portion 100 </ b> A, the carcass layer 100 </ b> B, and the belt layer 100 </ b> C constituting the electromagnets 50 to 52 is generated. Perform the process.

  In addition, it is preferable that electric power is supplied to the electromagnets 50 to 52 from when the green tire TR is set in each mold 30, 31, 33 (tire vulcanizing apparatus 1) to vulcanization. In particular, electric power is preferably supplied to the electromagnets 50 to 52 immediately after the raw tire TR is set.

  Thereby, bead part 100A, carcass layer 100B, and belt layer 100C which constitute a steel member provided in green tire TR are attracted to molds 30, 31, and 33 by the magnetic force of electromagnets 50-52. Therefore, the raw tire TR itself is attracted to the molds 30, 31, and 33, and the air in the vulcanization space is discharged to the outside through the vent holes 60, 61, 62, and 63.

  During vulcanization, the heated and pressurized fluid R is blown into the bladder 21, so that the bladder 21 expands inside the raw tire TR. The raw tire TR is molded into the sector mold 30, the lower side mold 31, and the upper side mold 33 by the expanded bladder 21. Thereby, the external appearance shape including the tread pattern of the raw tire TR is formed.

(Action / Effect)
In the embodiment described above, each of the molds 30, 31, and 33 is provided with electromagnets 50 to 52 that generate a magnetic force that attracts the steel member of the raw tire TR. For this reason, the raw tire TR is attracted to the molds 30, 31, 33 by the magnetic force of the steel member of the raw tire TR. Thereby, the air remaining between the raw tire TR and each of the molds 30, 31, 33 passes through the vent holes 60, 61, 62, 63 and is discharged to the outside. It becomes easy to become familiar with 31,33. Therefore, it is possible to more reliably reduce bear defects caused by air remaining between the raw tire TR and the molds 30, 31, 33. Moreover, since the electromagnets 50-52 are a simple structure compared with a general vacuum apparatus (for example, vacuum pump), the high cost can also be suppressed.

  In the embodiment, the electromagnet 52 extends along the direction corresponding to the tread width direction of the raw tire TR, and the electromagnets 50 and 51 extend along the direction corresponding to the tire radial direction of the raw tire TR. For this reason, the raw tire TR can be covered over a wide range by the electromagnets 50 to 52. Accordingly, the raw tire TR is more easily attracted to the molds 30, 31, and 33.

  In the embodiment, electric power is supplied to the electromagnets 50 to 52 from when the raw tire TR is set in each mold 30, 31, 33 (tire vulcanizing apparatus 1) to vulcanization. preferable. In particular, electric power is preferably supplied to the electromagnets 50 to 52 immediately after the raw tire TR is set. As a result, the air remaining between the raw tire TR and each of the molds 30, 31, 33 immediately after the raw tire TR is molded into the molds 30, 31, 33 forms vent holes 60, 61, 62, 63. It can pass through and be discharged to the outside, and the raw tire TR can be more easily adapted to the molds 30, 31, and 33.

(Other embodiments)
Although the contents of the present invention have been disclosed through the embodiments of the present invention as described above, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  Of course, the vulcanizing device 1 is not limited to the one described in the embodiment, and may have other configurations. For example, although the sector mold 30 is divided into nine, the number of divisions is not particularly limited.

  Further, although the electromagnet is disposed in all of the sector mold 30, the upper side mold 33, and the lower side mold 31, for example, even if the electromagnet is disposed only in the sector mold 30 or only in the lower side mold 31, a certain effect is obtained. be able to.

  Further, the electromagnet 52 extends along a direction corresponding to the tread width direction of the raw tire TR, and the electromagnets 50 and 51 extend along a direction corresponding to the tire radial direction of the raw tire TR. 50 to 52 may be provided along the outer shape of the raw tire TR.

  As described above, the present invention naturally includes various embodiments that are not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

  Next, the present invention will be described in more detail through examples.

  About the conventional example and this invention example, the radial tire for trucks and buses (TBR tire) was vulcanized, and the incidence rate of the bear defect generated in each tire was compared.

  The tire size used in Invention Example 1 and Comparative Example 1 was TBR 11R22.5 14 (M890Z), and 1750 tires were vulcanized. Vulcanization was performed for 7 days using a sector mold divided into 10 along the tire circumferential direction. The vulcanization condition of Invention Example 1 was that a magnetic force was generated by applying a current to the electromagnet for 180 seconds after closing the mold. A magnetic force with a magnetic flux density of 1.8 k Tesla was generated in both the crown portion and the sidewall portion in the raw tire. In Comparative Example 1, no magnetic force was generated.

  The tire size used in Invention Example 2 and Comparative Example 2 was TBR 225 / 70R175 12 (M810Z), and 1680 tires were vulcanized. Vulcanization was carried out for 7 days using a sector mold divided into six along the tire circumferential direction. The vulcanization condition of Invention Example 2 was that a magnetic force was generated by applying a current to the electromagnet for 120 seconds after closing the mold. A magnetic force with a magnetic flux density of 1.8 k Tesla was generated in both the crown portion and the sidewall portion in the raw tire. In Comparative Example 2, no magnetic force was generated.

  When the occurrence rates of the bears of the present invention examples 1 and 2 and comparative examples 1 and 2 were examined, the present invention example 1 was 0.12%, the present invention example 2 was 0.18%, the comparative example 1 54% and Comparative Example 2 were 1.37%. Thus, it was found that the bear occurrence rates of Invention Examples 1 and 2 were significantly lower than those of Comparative Examples 1 and 2.

DESCRIPTION OF SYMBOLS 1 Tire vulcanizer 30 Sector mold 31 Lower side mold 33 Upper side mold 50-52 Electromagnet 60-63 Vent hole

Claims (5)

A tire vulcanizing apparatus comprising a plurality of molds formed with vent holes communicating from the surface in contact with the raw tire to the outside while forming an unvulcanized raw tire having a steel member,
A tire vulcanizing apparatus in which at least one of the molds is provided with an electromagnet that generates a magnetic force to attract the steel member. The steel member is constituted by a bead portion, a carcass layer and a belt layer,
The mold is
A plurality of sector molds having an arc shape and forming a tread portion of the green tire;
A plurality of side molds forming the side portions of the green tire,
The electromagnet
A sector electromagnet provided in the sector mold and generating a magnetic force to attract the carcass layer and the belt layer;
The tire vulcanizing apparatus according to claim 1, further comprising a side electromagnet provided in the side mold and generating a magnetic force that attracts the bead portion and the carcass layer. The sector electromagnet extends along a direction corresponding to the tread width direction of the green tire,
The tire vulcanizer according to claim 2, wherein the side electromagnet extends along a direction corresponding to a tire radial direction of the green tire.   The tire vulcanizing apparatus according to any one of claims 1 to 3, wherein electric power is supplied to the electromagnet from when the green tire is set to the tire vulcanizing apparatus to when it is vulcanized. . Using a tire vulcanizing apparatus comprising a plurality of molds formed with a vent hole communicating from the surface in contact with the green tire to the outside while forming an unvulcanized green tire having a steel member, the green tire is A tire vulcanizing method for vulcanizing,
Step A for setting the raw tire in the tire vulcanizer;
A step B of generating a magnetic force that attracts the steel member from the electromagnet by supplying electric power to an electromagnet provided in at least one of the molds;
In the step B, a tire vulcanizing method in which the green tire is attracted to the mold by the magnetic force.

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