JPH09323323A - Method and apparatus for vulcanizing tire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To largely contribute to the shortening of manufacturing steps and automatic conveyance of a molded green tire by omitting a conventional special purpose green tire release agent coating step. SOLUTION: The method for vulcanizing a tire comprises the steps of setting a lower side bead part T1 to the lower mold bead ring 5b of an apparatus for vulcanizing the tire while holding the upper side bead part T2 of a green tire T by a vertical loader X, coating the inner surface T3 of the tire or at least one surface 7a of a bladder opposed to the inner surface T3 with a mold release agent before starting shaping of the tire T, then shaping the tire T, and vulcanizing to mold it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tire vulcanizing method and apparatus for vulcanizing and molding a green tire, and more specifically, omits a conventional dedicated green tire release agent coating step and shortens the manufacturing step. The present invention relates to a tire vulcanizing method and apparatus.

[0002]

2. Description of the Related Art Generally, a pneumatic tire is manufactured by vulcanizing and curing a green tire with a molding press. During the molding press, the green tire is vulcanized while being pressed against the inner surface of the mold by the high temperature steam and high pressure inert gas supplied into the bladder. By the way, the inner surface of the green tire to be vulcanized in this way is made of a silicone emulsion or the like for the purpose of improving the lubricity and releasability of the inner surface of the green tire and the bladder and eliminating the occurrence of tire vulcanization defects. A mold is applied.

Conventionally, the release agent is applied to the inner surface of the green tire by sending the green tire to a release agent applying step before vulcanization and applying the collected green tires collectively. This work is complicated and has been an obstacle to automatic transportation of the molded green tire. Further, since the coating time of the release agent is significantly shorter than the vulcanization time, it is necessary to temporarily stock the green tire after coating the release agent, which causes a problem that a large stock space is required. .

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the step of applying a green tire release agent, shorten the manufacturing process, and eliminate the need for a space for stocking the green tire after application of the release agent, and It is an object of the present invention to provide a tire vulcanizing method and apparatus that can greatly contribute to automatic conveyance of a molded green tire.

[0005]

The tire vulcanizing method of the present invention which achieves the above-mentioned object is a device for vulcanizing a lower bead portion of a green tire while holding the upper bead portion of the green tire by a vertical loader. Set on the lower bead ring of the green tire, before starting the shaping of the green tire, after applying a release agent to at least one of the inner surface of the green tire or the bladder surface facing the inner surface of the green tire, the green tire Is shaped and vulcanized and molded.

In the tire vulcanizing apparatus of the present invention, the lower bead ring of the green tire is set on the lower die bead ring while the upper bead portion of the green tire is held by the vertical loader. In a tire vulcanizer configured to inflate low-pressure gas into a bladder whose lower end is fixed to the ring inner peripheral side to shape the green tire, the inner surface of the green tire set on the lower bead ring or It is characterized in that an injection nozzle portion capable of applying a release agent is provided on at least one of the surfaces of the bladder facing the inner surface of the green tire.

After the lower bead portion of the green tire is set on the lower bead ring while being held by the vertical loader, the release agent is vulcanized to each green tire before the shaping of the green tire is started. It is not necessary to collect the green tires molded in the conventional way and apply the release agent all together in order to apply them in the device.Therefore, the conventional dedicated green tire release agent application configuration is required. It can be omitted. As a result, the manufacturing process is shortened, and a space for stocking the green tire after the release agent is applied is not needed, and it is possible to greatly contribute to the automatic transportation of the molded green tire.

[0008]

DETAILED DESCRIPTION OF THE INVENTION The configuration of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 shows an example of a tire vulcanizing apparatus according to the present invention, wherein 1 is an upper mold and 2 is a lower mold. Reference numeral 3 denotes a bag cylinder that stands upright on the center axis of the lower die 2. The bag cylinder 3 includes a lifting rod 4 that is vertically movable by a drive mechanism (not shown). A lower clamp ring 5 is attached to the upper hub of the bag cylinder 3.

The lower clamp ring 5 is composed of a clamp ring portion 5a fixed to the bag cylinder 3 and a lower bead ring 5b fixed to the outer periphery thereof, and the lower end portion of a cylindrical bladder 7 made of thin rubber. Are gripped and fixed between the outer peripheral surface of the clamp ring portion 5a and the inner peripheral surface of the lower bead ring 5b. An upper clamp ring 6 is attached to the upper end of the lifting rod 4 protruding above the bag cylinder 3, and the bladder 7 is attached to the upper clamp ring 6.
The upper end of is attached.

Above the bag cylinder 3, a bladder 7 is provided.
Supply passages 8 and 9 for supplying steam and an inert gas (nitrogen gas or the like) are formed therein, and the supply passage 8 for steam is connected to a steam source 11 for supplying high-temperature steam through a steam pipe 10. ing. A switching valve 12 is connected in the middle of the steam pipe 10 to turn on / off the supply of steam from the steam source 11.

The inert gas supply passage 9 is provided with a gas pipe 13
High-pressure gas source 14 for supplying an inert gas at room temperature via
It is connected to the. A switching valve 15 is provided in the middle of the gas pipe 13.
And a heater 16 for heating an inert gas at room temperature supplied from the gas source 14 is installed in the middle of the gas pipe 13 located between the switching valve 15 and the gas source 14. .

A low pressure gas source 17 for supplying a low pressure inert gas is connected to a switching valve 15 via a gas pipe 18, and by switching the three-position switching valve 15, the low pressure inert gas is supplied to the gas pipe. 13 can be supplied into the bladder 7 through the supply passage 9. 19 is, after vulcanization,
It is a discharge pipe for discharging the vapor and the inert gas in the bladder 7, and is connected to a discharge passage (not shown) formed in the upper clamp ring 6. Reference numeral 20 is an upper mold bead ring fixed to the upper mold 1.

According to the present invention, in the tire vulcanizing apparatus having the above-described structure, the lower bead ring 5b is provided with good lubricity and releasability of the inner surface of the green tire and the bladder to eliminate the occurrence of tire vulcanization defects. An injection nozzle portion 21 is provided for applying a release agent made of silicone emulsion or the like. The injection nozzle portion 21 has an injection port 22 that is open to the upper surface 5b ₂ on the inner peripheral side of the outer peripheral bead contact portion 5b _{1 of the} lower bead ring 5b with which the lower bead portion T1 of the green tire T that has been laid sideways is in contact. And the lower bead ring 5
and a supply passage portion 23 formed through b.
As shown in, while holding the upper bead portion T2 of the green tire T by the arm X1 of the vertical loader X,
When the lower bead portion T1 of the green tire T is set on the lower mold bead ring 5b, the green tire T is set on at least one of the inner surface T3 or the surface 7a of the bladder 7 facing the inner surface T3 of the green tire. It is configured so that a release agent can be applied.

The supply passage portion 23 is a release agent supply tank 2 capable of pressure-feeding the release agent through a flexible release agent pipe 25.
6 is connected. A switching valve 27 is connected in the middle of the release agent pipe 25 to turn on / off the supply of the release agent from the tank 26. In the present invention, a green tire can be vulcanized and molded by the above tire vulcanizing apparatus as follows.

First, as shown in FIG. 3, while holding the upper bead portion T2 of the green tire T by the arm X1 of the vertical loader X, the lower bead portion T1 of the green tire T is set on the lower mold bead ring 5b. Do (carry in green tires). Next, the switching valve 27 is turned on,
The release agent is supplied from the release agent supply tank 26 to the injection nozzle portion 21 via the release agent pipe 25, and the release agent is applied from the injection port 22 to at least one of the green tire inner surface T3 and the bladder surface 7a. .

After the coating is completed, the ascending / descending rod 4 descends and the switching valve 15 switches so that the low-pressure gas source 1
An inert gas at a low temperature and a room temperature (for example, 40 ° C. at 50 kPa) is supplied from 7 into the bladder 7, and shaping of the green tire T is started. As a result, the shape of the green tire T is maintained, and the shaped green tire T is set in the lower mold 2. The arm X1 of the vertical loader X separates and retracts at a predetermined time before the end of shaping.

On the other hand, as the lifting rod 4 descends, the upper mold 1
When the elevating rod 4 reaches the lower end of descent by a driving mechanism (not shown), the upper mold 1 closes the lower mold 2 from above and the green tire T is set in the mold as shown in FIG. Become. Subsequently, while the switching valve 15 is switched to the closed state, the switching valve 12 is opened, and the steam of the steam source 11 in the bladder 7 is passed through the steam pipe 10 to generate high-temperature and high-pressure steam (for example, 1.4 MPa at 200 ° C.). ) Is filled. Next, the switching valve 12 is switched to the closed state and the switching valve 15 is switched to the open state, and is heated from the high-pressure gas source 14 (for example, an inert gas of 40 ° C. at 1.4 MPa) via the heater 16. The inert gas is injected into the bladder 7, the inert gas is filled, and vulcanization molding is performed.

After the completion of vulcanization, steam and an inert gas are discharged from the discharge pipe 19, and then the upper mold 1 is retracted and the elevating rod 4 is moved up to open the lower mold 2. And
The vulcanized tire is taken out by the vertical loader X. As described above, in the present invention, the lower bead portion T1 is set on the lower mold bead ring 5b while the upper bead portion T2 of the green tire T is held by the vertical loader X, and before the shaping of the green tire T is started. Since the release agent is applied to the individual green tires in the vulcanizer, it is not necessary to apply the collected green tires in a lump as in the conventional case.
It is possible to omit the conventional dedicated green tire release agent coating step. Therefore, it is possible to shorten the manufacturing process, eliminate the need for a space for stocking the green tire after the release agent is applied, and it is possible to greatly contribute to the automatic transportation of the molded green tire. Become.

According to the present invention, in the above embodiment, FIG.
As shown in FIG.
It is preferable to provide them at a plurality of positions of b and arrange them at equal intervals. Since the release agent injected thereby can be uniformly applied to the inner surface T3 of the green tire and the bladder surface 7a, the lubricity and releasability of the inner surface of the green tire and the bladder can be improved. Injection nozzle 21
The number of installed can be about 2 to 8 places.

In the above-mentioned embodiment, the upper and lower mold halves are described, but the present invention is not limited to this, and the present invention is
It goes without saying that even a sectional type mold can be preferably used.

[0021]

As described above, the present invention sets the lower bead portion of the green tire on the lower bead ring of the tire vulcanizing device while holding the upper bead portion of the green tire by the vertical loader. Before starting the shaping of the green tire, after applying a release agent to at least one of the inner surface of the green tire or the bladder surface facing the inner surface of the green tire, shaping the green tire, for vulcanization molding, Since the conventional dedicated release agent coating process can be omitted, the manufacturing process can be shortened, the space for stocking the green tire after the release agent coating is unnecessary, and the molded green tire can be automatically conveyed. Can greatly contribute to

[Brief description of drawings]

FIG. 1 is an explanatory view showing an example of a tire vulcanizing apparatus of the present invention.

FIG. 2 is a plan view of a lower bead ring.

FIG. 3 is an explanatory cross-sectional view showing the main parts of the tire vulcanizing method of the present invention.

[Explanation of symbols]

1 Upper mold 2 Lower mold 4 Lifting rod 5 Lower clamp ring 5b Lower mold bead ring 6 Upper clamp ring 7 Bladder 7a Bladder surface 21 Injection nozzle part 26 Release agent supply tank T Green tire T1 Lower bead part T2 Upper bead part T3 Inner surface of green tire X Vertical loader

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location B29L 30:00

Claims (4)

[Claims] 1. A vertical loader holds the upper bead portion of a green tire while setting the lower bead portion of the green tire on a lower bead ring of a tire vulcanizing device before starting shaping of the green tire. In, after applying a release agent to at least one of the inner surface of the green tire or the bladder surface facing the inner surface of the green tire, shaping the green tire,
A method for vulcanizing and vulcanizing a tire. 2. The lower bead portion of the green tire is set on the lower die bead ring while the upper bead portion of the green tire is held by a vertical loader, and then the lower end portion is fixed to the inner peripheral side of the lower die bead ring. In a tire vulcanizing device for inflating low pressure gas into the formed bladder to shape the green tire, an inner surface of the green tire set on the lower bead ring or a bladder surface facing the inner surface of the green tire. A tire vulcanizing apparatus provided with an injection nozzle portion capable of applying a release agent to at least one of the above. 3. The tire vulcanizing apparatus according to claim 2, wherein the injection nozzle portions are provided at a plurality of locations on the lower mold bead ring. 4. The tire vulcanizing apparatus according to claim 3, wherein the injection nozzle portions are arranged at equal intervals.