JP5699020B2 - How to create a bladder - Google Patents

Description

  The present invention relates to a bladder creation method for creating a bladder used for tire vulcanization molding.

  A tire vulcanization molding apparatus for vulcanizing and molding a raw tire is equipped with a bladder. Specifically, after opening the mold and placing the raw tire, the bladder is inflated while the mold is closed and the raw tire is heated, so that the tire is added by pressing the raw tire with the bladder from the inside. Sulfur molding is performed.

  The tire vulcanization molding apparatus includes a tire vulcanization molding apparatus using an AFV (Autoform Vulcanizer) type bladder and a tire vulcanization molding apparatus using a center post type bladder.

  FIG. 6 is a diagram schematically showing a tire vulcanization molding apparatus using an AFV type bladder, where (a) is a diagram showing a state of the bladder before being peeled off from a vulcanized tire; b) is a diagram showing the state of the bladder after being peeled off from the vulcanized tire. FIG. 7 is a view schematically showing a bladder of a tire vulcanization molding apparatus using a center post type bladder.

  In a tire vulcanization molding apparatus using an AFV type bladder, a ball nose portion 101 is provided on a bladder 100 as shown in FIG. Then, as shown in FIG. 6B, the bladder 100 is peeled from the vulcanized tire by pushing down the ram cylinder 102 while the front end of the ram cylinder 102 is fitted in the ball nose portion 101.

  However, at present, as shown in FIG. 7, a center post type tire vulcanization molding apparatus including an AFV type bladder 200 is also used. This tire vulcanization molding apparatus has a configuration in which a mounting hole 202 for mounting a component for mounting the center post 201 is provided in the bladder 200 in place of the ball nose, and the center post 201 is mounted in the component mounting hole 202. By pulling down the center post 201, the bladder 100 is peeled from the vulcanized tire.

  Therefore, when creating a bladder, it is necessary to create an AFV type bladder and a center post type bladder having mounting holes in order to correspond to the above-described two types of tire vulcanization molding apparatuses.

JP 2006-56172 A

  When creating a center post type bladder having a component mounting hole, after creating a bladder by a bladder creation device (eg, Patent Document 1) for creating an AFV type bladder having a ball nose portion, The ball nose cut M / C was used to cut the ball nose portion of the bladder to form a component mounting hole.

  In the case of creating a center post type bladder having component mounting holes in this way, it is necessary to install a ball nose cut M / C in the production line in addition to the bladder creation device, which increases the equipment cost. There is a problem. Moreover, since the cutting work by ball nose cut M / C is required, there exists a problem that productivity falls. Furthermore, since the cut ball nose portion is disposed of, the material (slab) is wasted.

  The present invention creates a center post type bladder having a component mounting hole without performing a cutting operation of the ball nose portion, while using a bladder creation device for creating an AFV type bladder having a ball nose portion. An object is to provide a method of creating a bladder that can be used.

  Hereinafter, each claim will be described.

The invention described in claim 1
Create a bladder that has a die with a ball nose cavity for creating the ball nose part of the bladder and creates a bladder with component mounting holes by using a bladder creation device that creates a bladder by press vulcanization A method,
A cup body arranging step of arranging a cup body having the same shape as the ball nose part in a ball nose cavity of the mold for forming a ball nose part;
A press vulcanization process that performs press vulcanization of bladder material,
A bladder creation method comprising creating a bladder having a component mounting hole so that the bladder material does not enter the ball nose cavity during press vulcanization due to the presence of the cup body.

The invention described in claim 2
2. The method for creating a bladder according to claim 1, wherein the cup body is a cut product of the ball nose portion created by separating the ball nose portion from a bladder having a used ball nose portion. It is.

  According to the present invention, a center post type bladder having a component mounting hole is created without performing a cutting operation of the ball nose portion while using a bladder creation device for creating an AFV type bladder having a ball nose portion. A method of creating a bladder that can be provided can be provided.

It is a schematic diagram for demonstrating the creation method of the bladder which concerns on embodiment of this invention. It is a perspective view of the cup body used for the creation method of the bladder concerning an embodiment of the invention. It is a perspective view which shows the state which set the cup body to the lower mold | type of the production apparatus of the bladder which produces the AFV type bladder which has a ball nose part. It is a perspective view which shows the state which set the cup body to the lower mold | type of the production apparatus of the bladder which produces the AFV type bladder which has a ball nose part. It is a schematic diagram for demonstrating the creation method of the bladder which concerns on embodiment of this invention. It is a figure which shows typically the tire vulcanization molding apparatus using an AFV type bladder, (a) is a figure which shows the state of the bladder before peeling from a vulcanized tire, (b) is a figure. It is a figure which shows the state of the bladder after peeling off from the vulcanized tire. It is a figure which shows typically the bladder of the tire vulcanization molding apparatus using the center post type bladder.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 are schematic diagrams for explaining a method of creating a bladder according to an embodiment of the present invention.

1. Bladder Creation Device As shown in FIG. 1, the bladder creation device includes a mold 2 for creating a bladder having a ball nose portion for creating a bladder by press vulcanization, and a mechanism for opening and closing the mold 2. ing. The mold 2 includes an upper mold 3, a core mold 4, and a lower mold 5, and a central recess 4 a for ball nose formation is formed on the lower side of the core mold 4. The mold 5 is formed with a central protrusion 5a for forming a ball nose.

2. Cup Body FIG. 2 is a perspective view of a cup body used in the method for creating a bladder according to an embodiment of the present invention. As shown in FIG. 2, the cup body 6 is formed in the same shape as the ball nose portion of the bladder having the ball nose portion. In the present embodiment, the cup body 6 is a cut product of the ball nose portion that is created by separating the ball nose portion from a bladder (waste material) having the ball nose portion.

3. FIG. 3 is a perspective view showing a state of the lower mold in a normal state in which the cup body is not set in the lower mold of the bladder creating apparatus for creating the AFV type bladder having the ball nose portion. FIG. 4 is a perspective view showing a state in which a cup body is set in a lower mold of a bladder creating apparatus for creating an AFV type bladder having a ball nose portion.

  The method of creating a bladder according to the present embodiment is a method of creating a bladder having no ball nose part and having a part mounting hole by using the AFV type bladder creating apparatus 1. A sulfur process and a bladder take-out process.

(1) Cup body arrangement | positioning process In a cup body arrangement | positioning process, as shown to FIG. 3, FIG. 4, the cup body 6 is set to the lower mold | type 5 of the production apparatus 1 of a bladder. This is shown in FIG.

(2) Press vulcanization process In the press vulcanization process, an unvulcanized rubber bladder material 7 (slab) is placed in the lower mold 5, the lower mold 5 is raised and the mold 2 is closed, and then the press Vulcanize.

  At this time, as shown in FIG. 5, a cavity 2 a for creating a bladder is formed by the upper mold 3, the core mold 4, and the lower mold 5. However, the cup body 6 is disposed in the ball nose cavity 2b.

  For this reason, the bladder material 7 does not enter the ball nose cavity 2b portion, and a bladder having no ball nose portion can be created.

(3) Bladder removal step Open the mold, blow out air from the bottom of the core mold 4 to inflate the bladder and take out the bladder. At this time, since the cup body 6 is in close contact with the bladder, it is possible to prevent the cup body 6 from being inadvertently detached and causing the bladder to bulge out and the bladder to be taken out. On the other hand, since the cup body 6 is vulcanized, the cup body can be easily separated by inserting the tip of a jig such as a flat-blade screwdriver into the boundary between the bladder and the cup body.

  Since the cup body 6 is cured after being used (vulcanized) many times, the cup body 6 is easily detached from the bladder. For this reason, it is appropriate that the cup body 6 be used about 10 times.

4). Effects of this embodiment

(1) According to the present embodiment, since the ball nose cavity of the mold for forming the ball nose part includes the cup body arranging step of arranging the cup body having the same shape as the ball nose part, the press During vulcanization, the presence of the cup body prevents the bladder material from entering the ball nose cavity, thereby creating a bladder having component mounting holes.

  For this reason, it is possible to create a center post type bladder having a component mounting hole without performing a cutting operation of the ball nose portion while using a bladder creation device for creating an AFV type bladder having a ball nose portion. it can.

  Accordingly, it is not necessary to install the ball nose cut M / C in the production line in addition to the bladder creation device, so that the equipment cost is reduced. Further, the productivity can be improved by the amount that the cutting work by the ball nose cut M / C becomes unnecessary.

(2) When a cup body prepared by separating the ball nose portion of a used bladder is used as the cup body, it is possible to save the trouble of separately creating the cup body and to effectively use the waste material. Further, since the cup body has been vulcanized, the cup body does not adhere to the bladder due to a chemical reaction during the press vulcanization of the bladder. For this reason, the cup body can be easily separated by inserting the tip of a jig such as a flathead screwdriver into the boundary between the bladder and the cup body.

(3) After creating a bladder with a ball nose part, a method that does not create a ball nose part is used instead of a method that cuts the ball nose part. The amount can be reduced.

(4) As a result of applying the method of creating a bladder of the present embodiment to an actual factory, cutting work with a ball nose cut M / C of about 2 minutes per piece becomes unnecessary, and the material cost is reduced by about 6.0%. I was able to confirm that it was possible.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above embodiments. Various modifications can be made to the above-described embodiment within the same and equivalent scope as the present invention.

DESCRIPTION OF SYMBOLS 1 Bladder making apparatus 2 Mold 2a Cavity 2b Ball nose cavity 3 Upper mold 4 Core mold 4a Central concave part 5 for ball nose formation Lower mold 5a Central protrusion 6 for ball nose formation Cup body 7 Bladder material (slab)
100, 200 Bladder 101 Ball nose 102 Ram cylinder 201 Center post

Claims (2)

Create a bladder that has a die with a ball nose cavity for creating the ball nose part of the bladder and creates a bladder with component mounting holes by using a bladder creation device that creates a bladder by press vulcanization A method,
A cup body arranging step of arranging a cup body having the same shape as the ball nose part in a ball nose cavity of the mold for forming a ball nose part;
A press vulcanization process that performs press vulcanization of bladder material,
A bladder creation method comprising creating a bladder having a component mounting hole so that the bladder material does not enter the ball nose cavity during press vulcanization due to the presence of the cup body. 2. The method for creating a bladder according to claim 1, wherein the cup body is a cut product of the ball nose portion created by separating the ball nose portion from a bladder having a used ball nose portion. .

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