KR100550426B1 - Bladder Inserted Reinforced Material and the Apparatus of Manufacturing the Same - Google Patents

Abstract

The present invention relates to a bladder for vulcanizing a tire and an apparatus for manufacturing the same.

The bladder manufacturing apparatus of the present invention includes a core mold 33 for forming the inner surface of the bladder 1, and upper and lower detachable outer molds 31 and 32 for forming the outer shape of the bladder 1, ; A plurality of radial grooves 34 are formed in the upper surface of the core mold 33 toward the center direction, and a bar-shaped reinforcement 2 is inserted into the grooves 34.

In the bladder 1 manufactured by such an apparatus, a plurality of reinforcing members 2 are inserted radially from the position corresponding to the bead portion of the green tire 3 toward the center direction.

The bladder 1 thus manufactured is suppressed from excessive expansion in the vulcanization process due to the low pressure expansion of the green tire as compared to the conventional bladder, which not only prolongs the life of the bladder itself but also reduces the residual air between the bladder and the green tire. Since the discharge is smooth, the vulcanization failure of the green tire can be prevented, and it is particularly suitable for the manufacture of low flat tires.

Tires, green tires, bladder, reinforcement, vulcanization

Description

Bladder with Reinforcement and Apparatus for Manufacturing the Same {Bladder Inserted Reinforced Material and the Apparatus of Manufacturing the Same}

1 is a configuration diagram of a vulcanizer for explaining a step of vulcanizing a tire using a conventional bladder.

2 is a configuration diagram of an apparatus for manufacturing a conventional bladder.

3 is a configuration diagram of an apparatus for manufacturing the bladder of the present invention.

4 is a configuration diagram of a core mold in the apparatus of FIG. 3.

5 is a configuration diagram of a vulcanizer for explaining a step of vulcanizing a tire using the bladder of the present invention.

Explanation of symbols on the main parts of the drawings

1 ..... Bladder

2 ..... reinforcement

3 ..... Green Tire

10 .... vulcanizer

12 .... Clamp

30 .... Bladder Manufacturing Equipment

31, 32 ..... top and bottom separation mold

33 ..... Core Mold

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bladder for vulcanizing a tire and an apparatus for manufacturing the same, and more particularly, to a bladder in which a reinforcement having an extended life is inserted and a device for manufacturing the same.

In general, green tires formed in a tire manufacturing process are subjected to a curing process for increasing strength. 1 shows a schematic configuration of a vulcanizer for explaining the process of vulcanizing the green tire. As shown in FIG. 1, the vulcanization process of the green tire is mounted on the upper and lower molds 12 and 13 in the vulcanizer 10, and the bladder 11 is inserted into the inside of the bladder 11. By expansion, heat is transferred to the green tire 3 and vulcanized. Green tires vulcanized in the vulcanizer, because the cord shrinks due to the internal heat, in order to prevent this by blowing air into the green tires to maintain the original shape of the tire by expanding for a certain time. Therefore, in the vulcanizer 10, the bladder 11 serves as a low pressure expansion to make a constant shape to allow the green tire 3 to enter the molds 12 and 13 in addition to the function of transferring internal pressure and heat. do.

There are a variety of conventional apparatus for manufacturing bladder having this function. As a representative example, Republic of Korea Utility Model Model No. 292759, as shown in Figure 2, the core mold (Core Mold, 23) for forming the inner surface of the bladder 11, and the appearance of the bladder 11 The bladder manufacturing apparatus 20 including the upper and lower detachable outer molds 21 and 22 for forming is disclosed.

However, when the green tire 3 is vulcanized by the vulcanizer 10 as shown in FIG. 1 using the bladder manufactured by the above apparatus, in the low pressure expansion process, the vulcanizer ( There arises a problem that the portion 11b between the clamp 12 of 10) and the beads 3b of the green tire 3 are excessively expanded. As a result, the expansion of the other contact portion of the green tire is lowered, thereby preventing the remaining air between the green tire and the bladder to be discharged, resulting in poor vulcanization. In addition, the life of the bladder is not only lowered, but also frequent stamping occurs when the outer press of the vulcanizer descends. In particular, although the conventional tire bead is mainly 15 to 16 inches, a low flat tire of 20 inches or more has recently been developed. That is, the low flatness high performance tire has a smaller side width and a larger outer diameter of the bead. Because of the increase in outer diameter of the bead, the distance between the green tire bead portion and the cramp becomes longer during the vulcanization of the vulcanizing bladder. Severe. In order to solve the defects caused by the bladder in the production of high-inch low flat tires, it is necessary to enlarge the bladder clamp diameter, but to change the bladder clamp specification, the specification of the vulcanizer must be changed. Accordingly, enormous costs are incurred and improvement of the vulcanization bladder is required for the production of high performance tires at low cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and its object is to insert a bladder partial reinforcement located between the bead portion and the bladder clamp of the green tire, thereby suppressing the expansion of the bladder for the green tire. The present invention provides a bladder in which a reinforcement material is inserted to provide a constant internal pressure of the fuel cell and at the same time, to extend the service life of the remaining air.

Another object of the present invention is to provide an apparatus for manufacturing a bladder in which the above reinforcement is inserted.

Bladder in which the reinforcing material of the present invention is inserted for achieving the above object, in the bladder used in the vulcanization process of the green tire, a plurality of reinforcing materials from the position corresponding to the bead portion of the green tire (3) toward the center direction (2) is inserted, each reinforcement (2) is characterized in that it is inserted in a radial form.

In addition, the bladder manufacturing apparatus inserted into the reinforcing material according to the present invention includes a core mold for forming the inner surface of the bladder, and the top and bottom separate type mold for forming the outer shape of the bladder; The upper surface of the core mold is formed with a plurality of radial grooves toward the center direction, characterized in that the bar-shaped reinforcement is inserted into the groove.

Hereinafter, the present invention will be described in detail.

In the bladder in which the reinforcing material according to the present invention is inserted, unlike the conventional bladder, the reinforcing material is inserted into the bladder from the position corresponding to the bead portion of the green tire toward the center direction. In the bladder of the present invention, it is preferable that a plurality of the reinforcing members are provided in a radial form toward the center direction. Specifically, the position where the reinforcing material is inserted may correspond to a position from 20-30 mm front end to the bead end of the green tire when the bladder is hooked to the clamp of the bladder manufacturing apparatus.

In addition, in the present invention, the reinforcing material is preferably a bar (Bar) made of a metal material, such as mild steel (Mild Steel).

Hereinafter, the apparatus used for manufacturing the bladder will be described in detail with reference to the drawings.

3 is a configuration diagram of an apparatus for manufacturing the bladder of the present invention, Figure 4 is a diagram showing a detailed configuration of the core mold of the apparatus.

Bladder manufacturing apparatus 30 of the present invention, as shown in Figure 3, the core mold 33 for forming the inner surface of the bladder 1, and the upper and lower for forming the outer shape of the bladder 1 It comprises a separate outer mold 31, 32.

Bladder manufacturing apparatus 30 of the present invention, as shown in Figure 4, characterized in that a plurality of radial grooves 34 are formed on the upper surface of the core mold 33 toward the center direction. The groove 34 is formed so that the bar-shaped metal reinforcement 2 can be inserted. In FIG. 4, the groove 34 is disclosed as sixteen, but the number thereof is not particularly limited.

In order to manufacture the bladder 1 using the bladder manufacturing apparatus 30, the reinforcing material 2 is first placed in the groove 34 of the core mold 33, and then the top and bottom separation type molds 31 and 32 are used. ) And the bladder rubber is injected through the injection hole (35). At this time, the pressure of the bladder rubber is directed downward (arrow direction), so that the rubber is cured while the reinforcing material 2 is maintained in the groove 34, thereby producing a bladder. Then, when the upper and lower detachable molds 31 and 32 are demolded and the bladder 1 is pulled out of the core mold 33, a bladder in which the reinforcing material is inserted is manufactured.

When the green tire 3 is vulcanized by the vulcanizer 10 using the bladder 1 manufactured as described above, since the reinforcing material 2 is inserted into the bladder, as shown in FIG. Since the bladder 1 does not expand upward in the portion between the clamp 12 of the vulcanizer and the bead portion 3b of the green tire 3 in the low pressure expansion process, no deformation of the bladder occurs. Accordingly, the remaining air between the bladder and the green tire can be smoothly discharged to prevent the poor vulcanization of the green tire, and can also extend the life of the bladder itself.

As described above, the bladder in which the reinforcing material is inserted according to the present invention is suppressed from excessive expansion in the vulcanization process due to the low pressure expansion of the green tire as compared with the conventional bladder, which not only prolongs the life of the bladder itself, Discharge of remaining air between the green tires can be smoothly prevented, so that poor vulcanization of the green tires can be prevented. In particular, the bladder of the present invention is very suitable for the production of low flat tires of tires.

In addition, the apparatus of the present invention for manufacturing the bladder in which the reinforcing material is inserted, there is an advantage that can produce a low flat tire at low cost production cost without modifying the existing vulcanizer.

Claims (3)

In the bladder used for the vulcanization process of the green tire, A plurality of reinforcement 2 is inserted from the position corresponding to the bead portion of the green tire 3 toward the center direction, each of the reinforcement 2 is inserted into the radial shape bladder inserted . The method of claim 1, The reinforcement (2) is a bladder inserted into the reinforcement, characterized in that the bar (Bar) metal material. In the bladder manufacturing apparatus, A core mold 33 for forming an inner surface of the bladder 1, An upper and lower detachable outer molds 31 and 32 for forming an outer shape of the bladder 1; A plurality of radial grooves 34 are formed in the upper surface of the core mold 33 toward the center direction, and a reinforcement member is inserted into the grooves 34 with a bar reinforcement member 2 inserted therein. Apparatus for manufacturing bladders.

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