JP3938325B2 - Tire pre-forming method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tire pre-molding method and apparatus, and more particularly, in a pre-process for putting an unvulcanized tire into a vulcanizing apparatus, in a state in which the outer surface of the unvulcanized tire is gripped. The present invention relates to a tire preforming method and an apparatus for performing preforming.
[0002]
[Prior art]
Conventionally, in a tire vulcanizing apparatus, for example, as shown in FIG. 4, an unvulcanized tire (raw tire) W is installed on a lower mold 2 fixed on the vulcanizing apparatus 1 and then unvulcanized. A method of assembling the tire W and the bladder 4 of the bladder mechanism 3, closing the upper mold 5 and the divided mold 6, and fitting the bead ring 7 to the upper and lower bead portions Wa of the unvulcanized tire W is performed. .
[0003]
[Problems to be solved by the invention]
However, the mounting operation of the bead ring 7 on the unvulcanized tire W is asymmetrical in the vertical direction, and there is a problem that the unvulcanized tire W and the bladder 4 cannot be assembled with high accuracy due to misalignment. The assembly accuracy was further deteriorated due to non-uniform elongation due to manufacturing variations.
[0004]
Further, when assembling the unvulcanized tire W and the bladder 4, the bladder 4 and the gripping member are in contact with each other because the inner diameter portion of the unvulcanized tire W is gripped by gripping members such as gripping claws. There was a problem of adverse effects such as rubbing the bladder.
[0005]
Although a method of assembling the bladder and the unvulcanized tire outside the vulcanizer is also conceivable, the assembling accuracy is not good on the vulcanizer due to the asymmetrical vertical motion.
[0006]
This invention pays attention to such conventional problems, and since the unvulcanized tire, the bladder and the bead ring are pre-assembled on the basis of the bead ring outside the tire vulcanizer, the bladder is accurately inserted into the unvulcanized tire. Further, it is an object of the present invention to provide a tire pre-forming method and apparatus capable of accurately inserting a preformed unvulcanized tire into a mold of a vulcanizer without causing deformation.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a tire preforming method in which a bladder unit is inserted into the center of an unvulcanized tire in a state where the outer peripheral surface of the molded unvulcanized tire is gripped. After introducing a preheated fluid into the bladder of this bladder unit, the pair of bladder clamp rings are pulled together to store the bladder in the unvulcanized tire, and then the pair of bead rings provided on the coaxial line with the central mechanism of the bladder are pulled together. The gist of the invention is to engage the bead portion of the unvulcanized tire and further introduce a preheated fluid into the bladder to perform preforming, and in this state, to convey the tire to the tire vulcanizer.
[0008]
Further, in the above preforming method, the pair of bladder clamp rings of the bladder unit and the pair of bead rings are simultaneously drawn and engaged with the bead portion of the unvulcanized tire, and at the same time, the preheating fluid is introduced into the bladder. Introduced and preformed.
[0009]
In this way, since the unvulcanized tire and the bladder and bead ring of the bladder unit are pre-assembled on the basis of the bead ring outside the tire vulcanizer, the bladder can be accurately inserted into the unvulcanized tire and pre-molded. Therefore, the unvulcanized tire can be inserted with high accuracy into the mold of the vulcanizer without being deformed.
[0010]
Also, by gripping and gripping the unvulcanized tire, the bladder can be accurately inserted into the unvulcanized tire without contact between the gripping claws and the bladder, and the bead portion of the unvulcanized tire is beaded. Because it is fitted to the ring, even if there is an uneven part of the bladder, it does not affect the accuracy, and the bead ring is fitted to the bead part of the unvulcanized tire, so it is highly accurate even at low pressure. Can be assembled.
[0011]
Further, the tire preforming device of the present invention has a support member standing vertically or horizontally outside the tire vulcanizing device, and a pair of approaching and separating can be performed on the support member via a guide means and a moving means. A movable member is disposed, and a bladder unit is disposed on the same axis line of the opposing surfaces of the movable member. The bladder unit is provided with a pair of bead rings that can be moved via a cylinder. The gist is that a bladder provided with a bladder clamp ring is configured to be able to approach and separate on the same axis as the bead ring via a bladder center mechanism.
[0012]
The bladder center mechanism includes a cylinder that draws one bladder clamp ring through a rod, and an introduction mechanism that introduces a preheated fluid into the bladder. A gripping means for detachably gripping the outer peripheral surface of the unvulcanized tire at the time of vulcanization molding is installed. In addition, an electric heater is attached to the bladder clamp ring or bead ring.
[0013]
In this way, it is molded by installing a compact and simple preforming device that pre-assembles the unvulcanized tire and the bladder and bead ring of the bladder unit on the basis of the bead ring outside the tire vulcanizing device. The bladder and bead ring can be easily assembled to the unvulcanized tire based on the bead ring, and the unvulcanized tire assembly can be accurately inserted into the mold of the vulcanizer to improve the accuracy of the product tire. Can be increased.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0015]
In addition, the same component as a prior art example attaches | subjects the same code | symbol, and abbreviate | omits description.
[0016]
FIG. 1 is a front view of a preforming apparatus installed outside a tire vulcanizing apparatus for carrying out a tire preforming method. The preforming apparatus 10 vertically supports a support member 12 on a base plate 11. A pair of moving members 15 a and 15 b that can be moved toward and away from each other via guide means 13 and moving means 14 are disposed on the side surface of the support member 12. In this embodiment, the preforming apparatus 10 is erected in the vertical direction, but can be installed horizontally.
[0017]
The guide means 13 includes guide rails 16a and 16b attached to the side surface of the support member 12, and a slide guide 17 of a moving member 15 slidably engaged with the guide rails 16a and 16b. 14, drive motors 19 capable of normal rotation or reverse rotation are respectively installed on support plates 18 a and 18 b that are mounted in directions orthogonal to the upper and lower portions of the support member 12, and feed screws that are rotated by the drive motor 19. 20 is screwed onto a nut member (not shown) of the moving members 15a and 15b.
[0018]
Therefore, when the drive motor 19 is driven forward or backward, the moving members 15a and 15b are configured to move up and down as well as to move away from the guide means 13 via the feed screw 20.
[0019]
A bladder unit 30 is disposed on the same axis XX of the opposing surfaces of the moving members 15a and 15b. The bladder unit 30 is a pair of bead rings 22a movable via cylinders 21a and 21b. , 22b, and a bladder 24 having upper and lower bladder clamp rings 23a, 23b on the same axis XX as the upper side bead ring 22a can be approached and separated via a bladder center mechanism 25 such as a guide rod. It is configured. The upper and lower bladder clamp rings 23a and 23b and the pair of bead rings 22a and 22b are provided with electric heaters (not shown).
[0020]
The bladder center mechanism 25 includes a cylinder 26 that draws one bladder clamp ring 23b through a rod 25a, and an introduction mechanism 27 that introduces a preheated fluid Q into the bladder 24. The introduction mechanism 27 includes: It is connected to a preheating fluid Q installed outside the apparatus.
[0021]
Also, in the vicinity of the preforming device 10, a ring-shaped openable / closable gripping means 28 for detachably gripping the outer peripheral surface of the unvulcanized tire W at the time of preliminary vulcanization molding of the unvulcanized tire W is installed. Yes, this gripping means 28 reciprocates between the second stage molding machine while gripping the unvulcanized tire W.
[0022]
As described above, the unvulcanized tire W, the bladder 24, and the bead rings 22a and 22b are simply assembled on the outside of the tire vulcanizing apparatus with reference to the bead rings 22a and 22b. The bladder 24 and the bead rings 22a and 22b can be easily assembled to the sulfurized tire W on the basis of the bead rings 22a and 22b. The assembly can be inserted with high accuracy.
[0023]
Next, a tire preforming method will be described.
[0024]
2A to 2D are process diagrams showing a first embodiment of the preforming method of the present invention.
[0025]
As shown in FIG. 2 (a), the pre-molding method of the first embodiment is the unvulcanized tire in a state where the outer peripheral surface of the molded unvulcanized tire W is gripped by the gripping means 28 that can be opened and closed. The bladder 24 of the bladder unit 30 is inserted into the center of W, and the pair of bladder clamp rings 23a and 23b are pulled through the cylinder 26 while introducing the preheated fluid Q into the bladder 24 (see FIG. 2B). ).
[0026]
Then, as shown in FIG. 2C, after the bladder 24 is accommodated in the unvulcanized tire W, a pair of bead rings 22a and 22b provided on the coaxial line XX with the bladder center mechanism 25 of the bladder 24. Is drawn by the guide means 13 and the moving means 14 through the moving members 15a and 15b and engaged with the bead portion Wa of the unvulcanized tire W, and the preheating fluid Q is further introduced into the bladder 24 to perform the pre-molding. (Refer to FIG. 2D).
[0027]
Then, the assembly body of the unvulcanized tire W and the bladder unit 30 is conveyed to a tire vulcanizing device in a state where the above state is maintained.
[0028]
Next, FIGS. 3A to 3C are process diagrams showing a second embodiment of the preforming method of the present invention.
[0029]
In the following description, the same description as in the first embodiment will be given with the same reference numerals.
[0030]
The preforming method of the second embodiment includes a pair of bladder clamp rings 23a, 23b and a pair of bead rings 22a, 22b of the first embodiment, a cylinder 26, and guide means 13 for moving members 15a, 15b. By simultaneously driving the means 14, the means 14 is drawn and engaged with the bead portion Wa of the unvulcanized tire W, and the preliminary heating fluid Q is further introduced into the bladder 24 to perform preliminary molding. Thereby, the process can be shortened.
[0031]
Since other processes are the same as those in the first embodiment, description thereof will be omitted.
[0032]
【The invention's effect】
Since the present invention is configured as described above, the following excellent effects can be obtained.
(a) Since the unvulcanized tire and the bladder and bead ring of the bladder unit are pre-assembled on the basis of the bead ring outside the tire vulcanizer, the bladder can be accurately inserted into the unvulcanized tire.
(b) The preformed unvulcanized tire can be accurately inserted into the mold of the vulcanizer without being deformed.
(c) By gripping and gripping the unvulcanized tire, the bladder can be accurately inserted into the unvulcanized tire without the gripping claws and the bladder coming into contact with each other.
(d) Since the bead portion of the unvulcanized tire is fitted to the bead ring, even if there is a non-uniform portion in the elongation of the bladder, the accuracy is not affected.
(e) Since the bead ring is fitted to the bead portion of the unvulcanized tire, accurate assembly can be performed even at a low pressure.
(f) The unvulcanized tire assembly can be accurately inserted into the mold of the vulcanizing apparatus, and the accuracy of the product tire can be improved.
[Brief description of the drawings]
FIG. 1 is a front view of a preforming apparatus installed outside a tire vulcanizing apparatus for carrying out a tire preforming method.
FIGS. 2A to 2D are process diagrams showing a first embodiment of a preforming method of the present invention.
FIGS. 3A to 3C are process diagrams showing a second embodiment of the preforming method of the present invention. FIGS.
FIG. 4 is an explanatory view of a general tire vulcanizing apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vulcanizer 2 Lower mold 3 Bladder mechanism 4 Bladder 5 Upper mold 6 Split mold 7 Bead ring W Unvulcanized tire Wa Upper / lower bead part 10 of unvulcanized tire Preliminary molding apparatus 11 Base plate 12 Support member 13 Guide means 14 moving means 15a, 15b moving members 16a, 16b guide rails 17 slide guides 18a, 18b support plates 19 drive motors 20 feed screws 21a, 21b cylinders 22a, 22b bead rings 23a, 23b bladder clamp rings 24 bladders 25 bladder central mechanisms 25a rods 26 Cylinder 27 Introduction mechanism 28 Gripping means 30 Bladder unit Q Preheated fluid

Claims (6)

While holding the outer peripheral surface of the molded unvulcanized tire, insert a bladder unit into the center of the unvulcanized tire, and introduce a pair of bladder clamp rings while introducing preheated fluid into the bladder of the bladder unit. After pulling and storing the bladder in the unvulcanized tire, the pair of bead rings provided on the coaxial line with the central mechanism of the bladder are pulled and engaged with the bead portion of the unvulcanized tire, and the preheated fluid in the bladder Is further introduced to perform preforming, and in this state, the tire is preformed and conveyed to a tire vulcanizer. A pair of bladder clamp rings and a pair of bead rings of the bladder unit are simultaneously pulled and engaged with a bead portion of an unvulcanized tire, and at the same time, preheating fluid is introduced into the bladder to perform pre-molding. Item 2. A method for preforming a tire according to Item 1. A support member is erected vertically or horizontally outside the tire vulcanizing apparatus, and a pair of movable members that can be moved toward and away from each other are disposed on the support member via guide means and moving means. A bladder unit is arranged on the same axis line of the facing surface, and this bladder unit is provided with a pair of bead rings movable via a cylinder, and a bladder clamp ring is arranged on the same axis line as the upper side bead ring. A tire pre-molding apparatus, wherein a bladder provided is configured to be able to approach and separate through a bladder central mechanism. The tire pre-forming apparatus according to claim 3, wherein the bladder center mechanism includes a cylinder that draws one bladder clamp ring through a rod, and an introduction mechanism that introduces a pre-heating fluid into the bladder. The tire preforming device according to claim 3 or 4, wherein gripping means is provided in the vicinity of the preforming device so as to detachably grip the outer peripheral surface of the unvulcanized tire during preliminary vulcanization molding of the unvulcanized tire. The tire pre-forming apparatus according to claim 3, 4 or 5, wherein an electric heater is attached to the bladder clamp ring or bead ring.

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