JP2017001352A - Method of manufacturing unvulcanized tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively discharge residual air.SOLUTION: A method of manufacturing an unvulcanized tire includes a molding step of forming an unvulcanized tire molding 10 by stacking a plurality of constructional elements, and a discharge step of discharging residual air between the constructional elements to an inner chamber 31 or an outside space 32 by making a difference between pressure of the inner chamber 31 defined by an inner surface of the unvulcanized tire molding 10 and internal pressure of the outside space 32 covering an outer surface of the unvulcanized tire molding 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for producing an unvulcanized tire.

  Conventionally, for example, a method for producing an unvulcanized tire as described in Patent Document 1 below is known. This method has a step of discharging residual air remaining between constituent members in an unvulcanized tire molded body formed by laminating a plurality of constituent members.

JP 2005-238654 A

  However, in the conventional method for producing an unvulcanized tire, there is room for improvement in effectively discharging residual air.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to effectively discharge residual air.

In order to solve the above problems, the present invention proposes the following means.
An unvulcanized tire manufacturing method according to the present invention includes a molding step in which a plurality of constituent members are laminated to form an unvulcanized tire molded body, and an inner chamber defined by an inner surface of the unvulcanized tire molded body And a discharge step of discharging the residual air between the constituent members to the inner chamber or the outer space, with the pressure of the inner space being different from the inner pressure of the outer space covering the outer surface of the unvulcanized tire molded body. It is characterized by that.

In this case, the pressure in the inner chamber and the inner pressure in the outer space are made different during the discharging process. Therefore, when the pressure in the inner chamber is higher than the inner pressure in the outer space, the residual air is pushed out from the inner surface side of the unvulcanized tire molded body toward the outer surface side and discharged into the outer space. Further, when the internal pressure in the outer space is higher than the pressure in the inner chamber, the residual air is pushed out from the outer surface side to the inner surface side of the unvulcanized tire molded body and discharged into the inner chamber.
As described above, by making the pressure in the inner chamber different from the inner pressure in the outer space during the discharging process, residual air is pushed out of the unvulcanized tire molded body and discharged into the outer space or the inner chamber. Therefore, for example, the residual air can be discharged from the unvulcanized tire molded body regardless of its size and position, and the residual air can be discharged effectively. In addition, for example, when the residual air is discharged from the unvulcanized tire molded body by pressing the outer surface of the unvulcanized tire molded body with a pressing body, the residual air is discharged while being dispersed in a small manner by the press, which is large. It may take a long time to discharge the residual air.
Further, since the residual air can be effectively discharged, it is possible to prevent air from entering the product tire after vulcanization, and the yield of the product tire can be improved.
In addition, by making the pressure in the inner chamber different from the pressure in the outer space, the residual air is pushed out from the unvulcanized tire molded body and discharged. For example, a through hole for discharging the residual air is formed in the component member Even if it does not do, residual air can be discharged | emitted. In this case, an increase in the number of manufacturing steps can be easily suppressed, and an unexpected air leak in the product tire can be reliably prevented.

  In the discharging step, the pressure in the inner chamber may be higher than the inner pressure in the outer space.

  In this case, the pressure in the inner chamber is made higher than the inner pressure in the outer space during the discharging process, so that unintended deformation of the unvulcanized tire molded body can be suppressed, and the shape of the unvulcanized tire can be made with high accuracy. Maintain and improve quality.

  In the discharging step, the internal pressure of the outer space may be lower than atmospheric pressure.

  In this case, since the internal pressure of the outer space is made lower than the atmospheric pressure during the discharge process, the residual air can be easily discharged positively.

  The discharging step increases the internal pressure of the outer space by discharging air from the outer space between the cover sheet covering the outer surface of the unvulcanized tire molded body and the outer surface of the unvulcanized tire molded body. It may be lower than the atmospheric pressure.

  In this case, the internal pressure of the outer space is made lower than the atmospheric pressure by discharging air from the outer space between the cover sheet and the outer surface of the unvulcanized tire molded body during the discharging process. The internal pressure of the space can be lowered.

  In the discharging step, when air is discharged from the outer space, the flexible cover sheet may be brought into close contact with the outer surface of the unvulcanized tire molded body.

  In this case, when the air is discharged from the outer space, the flexible cover sheet is brought into close contact with the outer surface of the unvulcanized tire molded body. It is possible to facilitate the discharge of residual air, making it easy to positively discharge residual air.

  In the discharging step, the pressure in the inner chamber may be higher than atmospheric pressure.

  In this case, since the pressure in the inner chamber is made higher than the atmospheric pressure during the discharge process, the residual air can be easily discharged positively.

  In the discharging step, the pressure in the inner chamber may be made higher than the atmospheric pressure by inflating and deforming a bladder disposed in the inner chamber and pressing the bladder on the inner surface of the unvulcanized tire molded body.

  In this case, the pressure in the inner chamber is made higher than the atmospheric pressure by inflating and deforming the bladder and pressing it against the inner surface of the unvulcanized tire molded body during the discharging step. Therefore, the inner surface of the unvulcanized tire molded body can be pressed toward the outer surface over the entire region by the bladder. As a result, it becomes possible to effectively apply a pressing force from the inner surface side to the outer surface side to the unvulcanized tire molded body, and it is possible to more easily discharge residual air, and the unvulcanized tire This shape can be maintained with higher accuracy.

  According to the present invention, residual air can be effectively discharged.

It is a figure explaining the manufacturing method of the unvulcanized tire which concerns on one Embodiment of this invention.

Hereinafter, with reference to drawings, the manufacturing method of the unvulcanized tire concerning one embodiment of the present invention is explained.
In the method for manufacturing an unvulcanized tire, first, a molding process is performed in which a plurality of constituent members are laminated to form the unvulcanized tire molded body 10. In this molding process, residual air may be generated between the constituent members due to, for example, variations in the lengths of the constituent members or poor adhesion.

Therefore, in the present embodiment, a discharge process for discharging residual air between the constituent members is performed.
In this discharging process, an air bleeder 20 (hereinafter referred to as “air bleeder 20”) for an unvulcanized tire molded body as shown in FIG. 1 is used. The air bleeding device 20 includes a base plate 21, a center post 22, a clamp ring 23, a bladder 24, a cover sheet 25, a fixing ring 26, an inner pressure adjusting unit 27, and an outer pressure adjusting unit 28. ing.

  Here, the base plate 21 is formed in a circular shape in plan view, and the base plate 21, the center post 22 and the clamp ring 23 are arranged on a common axis extending in the vertical direction and orthogonal to the horizontal direction. Hereinafter, this common axis is referred to as an apparatus axis O, and in a plan view of the air bleeding apparatus 20 viewed from the vertical direction, a direction orthogonal to the apparatus axis O is referred to as a radial direction, and a direction around the apparatus axis O is referred to as a radial direction. It is called the circumferential direction.

The base plate 21 is along the horizontal direction and orthogonal to the vertical direction.
The center post 22 protrudes upward from the base plate 21. The center post 22 is formed so as to be vertically movable or vertically extendable, and the size of the portion of the center post 22 protruding upward from the base plate 21 can be adjusted. The center post 22 is inserted into the unvulcanized tire molded body 10 disposed on the base plate 21 and is disposed in the inner chamber 31 defined by the inner surface of the unvulcanized tire molded body 10.

A pair of upper and lower clamp rings 23 are provided. The lower clamp ring 23 is fixed to the upper surface of the base plate 21, and the upper clamp ring 23 is fixed to the upper end of the center post 22. Both of these clamp rings 23 are divided into two in the vertical direction.
The bladder 24 is disposed in the inner chamber 31. The bladder 24 is expanded and deformed into a donut shape when air is supplied to the inside thereof. The bladder 24 has flexibility, and the upper end opening edge and the lower end opening edge of the bladder 24 are airtightly held by the clamp rings 23 respectively.

The cover sheet 25 covers the outer surface of the unvulcanized tire molded body 10. The cover sheet 25 has flexibility and is detachably attached to the unvulcanized tire molded body 10. The cover sheet 25 has its upper end opening edge and lower end opening edge respectively wound around the bead portion 11 of the unvulcanized tire molded body 10 from the outside in the vertical direction toward the inside, thereby the unvulcanized tire molded body 10. It is attached to. The cover sheet 25 defines an outer space 32 between the outer surface of the unvulcanized tire molded body 10. The outer space 32 covers the outer surface of the unvulcanized tire molded body 10 and extends over the entire circumference in the circumferential direction.
The fixing ring 26 sandwiches the unvulcanized tire molded body 10 with the base plate 21 in the vertical direction.

The inner pressure adjustment unit 27 adjusts the pressure in the inner chamber 31. The inner pressure adjustment unit 27 includes an air supply / exhaust passage 27 a for supplying and exhausting air into the bladder 24. The air supply / exhaust passage 27 a opens from the surface of the center post 22 into the bladder 24. The inner pressure adjusting unit 27 can increase the pressure in the inner chamber 31 by inflating and deforming the bladder 24 and pressing the bladder 24 against the inner surface of the unvulcanized tire molded body 10, and by changing the degree of pressing. The pressure in the inner chamber 31 is adjusted.
The outer pressure adjustment unit 28 adjusts the inner pressure of the outer space 32. The outer pressure adjustment unit 28 adjusts the internal pressure of the outer space 32 by supplying and exhausting air in the outer space 32. The outer pressure adjusting unit 28 supplies and exhausts air in the outer space 32 through the cover sheet 25.

  An example of the discharge process using the air bleeding device 20 will be described. In the discharging step, it is preferable to carry out in a temperature environment lower than the vulcanization temperature of the unvulcanized tire molded body 10 in order to prevent unintended vulcanization of the unvulcanized tire molded body 10.

  First, the cover sheet 25 is attached to the unvulcanized tire molded body 10, and the unvulcanized tire molded body 10 is disposed on the base plate 21. At this time, in a state where the bladder 24 is contracted and deformed by the inner pressure adjusting portion 27, the unvulcanized tire molded body 10 is inserted into the center post 22, and one bead portion 11 of the unvulcanized tire molded body 10 is inserted into the base plate. 21.

  Thereafter, the fixing ring 26 is disposed on the other bead portion 11 of the unvulcanized tire molded body 10, and the unvulcanized tire molded body 10 is sandwiched between the base plate 21 and the fixing ring 26 in the vertical direction. At this time, a part of the upper end opening edge of the cover sheet 25 is sandwiched between the other bead part 11 and the fixing ring 26, and a part of the lower end opening edge of the cover sheet 25 is one of the bead part 11 and the base plate. 21.

  Then, the pressure in the inner chamber 31 and the inner pressure in the outer space 32 are made different. In the present embodiment, the pressure in the inner chamber 31 is made higher than atmospheric pressure, the internal pressure in the outer space 32 is made lower than atmospheric pressure, and the pressure in the inner chamber 31 is made higher than the inner pressure in the outer space 32. At this time, the inner pressure adjusting unit 27 expands and deforms the bladder 24 and presses it against the inner surface of the unvulcanized tire molded body 10, thereby making the pressure in the inner chamber 31 higher than the atmospheric pressure. In addition, the outer pressure adjusting unit 28 discharges air from the outer space 32 to make the inner pressure of the outer space 32 lower than the atmospheric pressure. Note that the cover sheet 25 may be brought into close contact with the outer surface of the unvulcanized tire molded body 10 by discharging air from the outer space 32.

  Thus, by making the pressure of the inner chamber 31 higher than the inner pressure of the outer space 32, the residual air is pushed out from the inner surface side of the unvulcanized tire molded body 10 toward the outer surface side and discharged into the outer space 32. The Thereby, an unvulcanized tire is formed, and then a product tire is formed by vulcanizing the unvulcanized tire.

  As described above, according to the method for manufacturing an unvulcanized tire according to the present embodiment, the residual air is changed from the pressure in the inner chamber 31 and the inner pressure in the outer space 32 so that the residual air is formed into the unvulcanized tire molded body 10. And is discharged into the outer space 32. Therefore, for example, the residual air can be discharged from the unvulcanized tire molded body 10 regardless of its size and position, and the residual air can be discharged effectively. In addition, for example, when residual air is discharged from the unvulcanized tire molded body 10 by pressing the outer surface of the unvulcanized tire molded body 10 with a pressing body, the residual air is discharged while being dispersed in a small amount by pressing. It may take a long time to discharge large residual air.

Further, since the residual air can be effectively discharged, it is possible to prevent air from entering the product tire after vulcanization, and the yield of the product tire can be improved.
Further, since the residual air is pushed out from the unvulcanized tire molded body 10 and discharged by making the pressure in the inner chamber 31 different from the internal pressure in the outer space 32, for example, a through hole for discharging the remaining air to the constituent members Residual air can be discharged without forming holes. In this case, an increase in the number of manufacturing steps can be easily suppressed, and an unexpected air leak in the product tire can be reliably prevented.

  Further, since the pressure in the inner chamber 31 is made higher than the internal pressure in the outer space 32 during the discharging process, it is possible to suppress unintended deformation of the unvulcanized tire molded body 10 and to increase the shape of the unvulcanized tire. The accuracy can be maintained and the quality can be improved.

Moreover, since the internal pressure of the outer space 32 is made lower than the atmospheric pressure during the discharge process, it is possible to easily discharge the residual air.
Furthermore, since the air is discharged from the outer space 32 between the cover sheet 25 and the outer surface of the unvulcanized tire molded body 10 during the discharging process, the internal pressure of the outer space 32 is made lower than the atmospheric pressure. With the configuration, the internal pressure of the outer space 32 can be lowered.
When air is discharged from the outer space 32, when the cover sheet 25 having flexibility is brought into close contact with the outer surface of the unvulcanized tire molded body 10, the unvulcanized tire molded body 10 is stimulated from the outer surface side. This makes it possible to promote the discharge of residual air, and makes it easy to positively discharge residual air.

Moreover, since the pressure of the inner chamber 31 is made higher than the atmospheric pressure during the discharging process, it is possible to easily discharge the residual air.
Furthermore, the pressure of the inner chamber 31 is made higher than the atmospheric pressure by inflating and deforming the bladder 24 and pressing the inner surface of the unvulcanized tire molded body 10 during the discharging process. Therefore, the inner surface of the unvulcanized tire molded body 10 can be pressed toward the outer surface over the entire area by the bladder 24. Accordingly, it is possible to effectively apply a pressing force from the inner surface side to the outer surface side to the unvulcanized tire molded body 10, and it is possible to more easily discharge residual air, The shape of the tire can be maintained with higher accuracy.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

  In the above-described embodiment, the pressure in the inner chamber 31 is set higher than the atmospheric pressure and the inner pressure in the outer space 32 is set lower than the atmospheric pressure during the discharging process, but the present invention is not limited to this. For example, the pressure in the inner chamber 31 may be higher than the internal pressure in the outer space 32 in a state where both the pressure in the inner chamber 31 and the inner pressure in the outer space 32 are higher than atmospheric pressure. Furthermore, the pressure in the inner chamber 31 may be higher than the inner pressure in the outer space 32 in a state where both the pressure in the inner chamber 31 and the inner pressure in the outer space 32 are lower than the atmospheric pressure.

  In the embodiment, the outer space 32 is defined between the outer surface of the unvulcanized tire molded body 10 and the cover sheet 25, but the present invention is not limited to this. Instead of the cover sheet 25, a vacuum chamber capable of accommodating the unvulcanized tire molded body 10 is adopted, the inside of the vacuum chamber is defined as the outer space 32, and the inner pressure of the outer space 32 is adjusted by reducing the pressure inside the vacuum chamber. It is also possible.

  In the embodiment, the inner chamber 31 adjusts the pressure of the inner chamber 31 by inflating and deforming the bladder 24 and pressing it against the inner surface of the unvulcanized tire molded body 10, but the present invention is not limited to this. For example, the pressure of the inner chamber 31 may be adjusted by adopting a metal core that can be expanded and contracted in the inner chamber 31 and expanding the metal core and pressing it against the inner surface of the unvulcanized tire molded body 10.

  In the said embodiment, the pressure of the inner chamber 31 was made higher than the internal pressure of the outer space 32 at the time of a discharge | emission process, but this invention is not limited to this. For example, the internal pressure of the outer space 32 may be higher than the pressure of the inner chamber 31. In this case, the residual air can be pushed out from the outer surface side of the unvulcanized tire molded body 10 toward the inner surface side and discharged into the inner chamber 31.

  The discharging step may be performed in a vulcanizer.

  In addition, it is possible to appropriately replace the constituent elements in the embodiment with known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

10 Unvulcanized tire molded body 24 Bladder 25 Cover sheet 31 Inner chamber 32 Outer space

Claims (7)

A molding step of laminating a plurality of constituent members to form an unvulcanized tire molded body;
The pressure of the inner chamber defined by the inner surface of the unvulcanized tire molded body and the inner pressure of the outer space covering the outer surface of the unvulcanized tire molded body are made different, and the residual air between the constituent members is changed. And a discharging step of discharging to the inner chamber or the outer space.   The method for producing an unvulcanized tire according to claim 1, wherein in the discharging step, the pressure in the inner chamber is made higher than the inner pressure in the outer space.   The method for producing an unvulcanized tire according to claim 2, wherein in the discharging step, an internal pressure of the outer space is made lower than an atmospheric pressure.   The discharging step increases the internal pressure of the outer space by discharging air from the outer space between the cover sheet covering the outer surface of the unvulcanized tire molded body and the outer surface of the unvulcanized tire molded body. The method for producing an unvulcanized tire according to claim 3, wherein the pressure is lower than the atmospheric pressure.   5. The non-added portion according to claim 4, wherein, in the discharging step, when the air is discharged from the outer space, the cover sheet having flexibility is brought into close contact with an outer surface of the unvulcanized tire molded body. Manufacturing method of sulfur tire.   The method for producing an unvulcanized tire according to any one of claims 2 to 5, wherein, in the discharging step, the pressure in the inner chamber is made higher than atmospheric pressure.   The discharge step is characterized in that the pressure in the inner chamber is made higher than the atmospheric pressure by inflating and deforming a bladder disposed in the inner chamber and pressing the bladder on the inner surface of the unvulcanized tire molded body. 6. The method for producing an unvulcanized tire according to 6.

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