JP2013086299A - Method for manufacturing tire, pressing apparatus used for it and tire molding machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for manufacturing a tire capable of suppressing generation of failure of a product by decreasing or making unevenness of joint part of tire constituting members disappear when a green tire is molded, a pressing apparatus used for it and a tire molding machine.SOLUTION: The method for manufacturing the tire includes a step for molding a green tire by successively winding tire constitutional members 11 on a molding drum 10. After the tire constitutional members are wound on the molding drum, when the jointing parts 11A of the tire constitutional members are pressed by using the pressing apparatus arranged oppositely to the outer peripheral face of the molding drum, as the pressing apparatus, an apparatus which has a plurality of pressing parts 21 divided in the tire width direction, is used, to press the jointing parts of the tire constitutional members by a plurality of the pressing parts.

Description

  TECHNICAL FIELD The present invention relates to a tire manufacturing method, a pressing device used therefor, and a tire molding machine (hereinafter also simply referred to as “manufacturing method” and “molding machine”). The present invention relates to a tire manufacturing method according to an improvement, a pressing device used for the method, and a tire molding machine.

  In general, a tire is manufactured by sequentially winding constituent members such as an inner liner and a carcass ply on a molding drum to form a green tire, and then vulcanizing the green tire. In the green tire molding process, when winding the tire constituent member, it is necessary to join the winding start end and the winding end end of the tire constituent member.

  As a technique related to joining of both end portions of such a tire constituent member, for example, there are a carcass ply both end joining device disclosed in Patent Literature 1 and a sheet-like material joining method disclosed in Patent Literature 2. . Further, Patent Document 3 discloses an improved technique related to a synthetic resin drum mold press using a drum mold receiving plate and a pressure plate surrounding the drum mold receiving plate.

JP 2001-179846 A (Claims etc.) JP 2003-080611 A (Claims etc.) JP 50-8855 A (claims, etc.)

  By the way, when the tire constituent members are joined, irregularities having a size of about 5 mm at the maximum may be formed at the overlapping portions at both ends of the tire constituent members. If such unevenness remains, it may cause various product defects such as poor bonding and accumulation of air at the joint during vulcanization. Conventionally, the bonding part has been crimped by a roll-shaped or plate-shaped member, but the crimping alone has almost no effect on suppressing the unevenness, so the tire molding must be finished while leaving the unevenness of the bonded part. As a result, the occurrence of product defects could not be prevented.

  Therefore, an object of the present invention is to solve the above problems and reduce or eliminate the unevenness of the joint portion of the tire constituent member at the time of raw tire molding, thereby producing a tire manufacturing method capable of suppressing the occurrence of product defects, It is providing the press apparatus and tire molding machine used for it.

  As a result of intensive studies, the present inventors have found that the above problem can be solved by using a pressing device that presses the joint portion of the tire constituent member, which has a plurality of pressing portions divided in the tire width direction. The present invention has been completed.

That is, the tire manufacturing method of the present invention is a method for manufacturing a tire including a step of forming a raw tire by sequentially winding tire components on a molding drum,
After the tire component member is wound on the molding drum, the joint portion of the tire component member is pressed using a pressing device disposed relative to the outer peripheral surface of the molding drum.
As the pressing device, a device having a plurality of pressing portions divided in the tire width direction is used, and the joining portions of the tire constituent members are pressed by the plurality of pressing portions.

Further, the pressing device of the present invention is a pressing device that is disposed relative to the outer peripheral surface of a molding drum used for molding a raw tire and includes a pressing portion that presses a joining portion of a tire constituent member wound around the molding drum. Because
The pressing portion is divided into a plurality in the tire width direction.

Furthermore, the tire molding machine of the present invention is a tire molding machine including a molding drum used for molding a raw tire,
A pressing device that is disposed relative to the outer peripheral surface of the molding drum and presses a joining portion of a tire constituent member wound around the molding drum; and the pressing device is divided into a plurality of tire width directions. It has a pressing part.

  In this invention, it is preferable that the said press part is heatable, and, thereby, the junction part of the said tire structural member can be pressed with the said heated press part. Moreover, in this invention, it is preferable that the surface facing the outer peripheral surface of the said forming drum of the said press part exhibits R shape along a tire circumferential direction.

  According to the present invention, a tire manufacturing method that can reduce or eliminate unevenness of a joint portion of a tire constituent member that occurs at the time of green tire molding and suppress the occurrence of product defects by using the above configuration, and the tire manufacturing method can be used for it. A pressing device and a tire molding machine can be realized.

It is a schematic explanatory drawing which shows the structure of the tire molding machine of this invention. (A) is explanatory drawing which shows an example of the press part which concerns on this invention, (b) is explanatory drawing which shows the state which is pressing the junction part by the press part. It is a graph which shows the relationship between the heating conditions of a press part and an uneven | corrugated suppression amount in an Example.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, the schematic explanatory drawing which shows the structure of the tire molding machine of this invention is shown. As shown in the figure, the tire molding machine of the present invention includes a molding drum 10 used for molding a raw tire.

  The molding machine of the present invention is provided with a pressing device (not shown) that is disposed relative to the outer peripheral surface of the molding drum 10 and presses the joining portion 11A of the tire constituent member 11 wound around the molding drum 10. This pressing device is characterized in that it has a plurality of pressing portions 21 divided in the tire width direction. By providing a pressing device for pressing the joint portion relative to the outer peripheral surface of the molding drum 10, the unevenness of the joint portion that could not be reduced only by the crimping operation using a conventional roller or the like is reliably reduced or eliminated. Thus, it has become possible to reduce the occurrence of manufacturing defects due to the unevenness, which accounts for many of the tire product defects.

  Here, the joining portion 11A of the tire constituent member 11 specifically refers to the tire constituent member 11 generated when the tire constituent member 11 is wound on the outer peripheral surface of the molding drum 11 and the end portions are joined together. The overlapping part. Further, the tire constituent member in the present invention is a constituent member of a raw tire assembled on the molding drum 10, and specifically includes a carcass ply, a belt, and the like.

  Further, as shown in the drawing, the tire constituent member 11 on the molding drum 10 generally has large unevenness due to an inner pad or the like in the tire width direction, but the pressing portion 21 according to the present invention is divided into a plurality in the tire width direction. Therefore, the inclination of the unevenness in the tire width direction can be easily followed. Therefore, the unevenness | corrugation of a junction part can be reduced reliably over a tire width direction. Here, about the division | segmentation number of the press part 21 which concerns on this invention, it does not restrict | limit in particular, It can select suitably according to a tire size, Specifically, it shall be about 20-100 pieces, for example. Can do. If the number of divisions is too small, the effect of dividing may not be sufficiently obtained, and if the number of divisions is too large, no further effect can be obtained.

  FIG. 2A shows an explanatory view showing an example of the pressing portion 21 according to the pressing device of the present invention. FIG. 2B is an explanatory diagram showing a state in which the joining portion 11A is being pressed by the pressing portion 21. FIG. The pressing device of the present invention includes a driving mechanism 22 made of, for example, an air cylinder, and the pressing mechanism 21 illustrated in FIG. Press. Moreover, it is preferable to form so that the surface 21a opposite to the outer peripheral surface of the molding drum 10 of the press part 21 may exhibit R shape along a tire circumferential direction so that it may illustrate. Thereby, since the press part 21 follows the outer peripheral surface of the forming drum 10, the effect which reduces the unevenness | corrugation of a junction part more effectively can be acquired. The radius of curvature R of the R shape in the pressing portion 21 can be set for each molding drum 10 according to the curvature of the outer peripheral surface of the molding drum 10, and is not particularly limited.

  Furthermore, it is preferable that the press part 21 which concerns on this invention is formed so that heating is possible. By making the pressing portion 21 heatable, the tire constituent member 11 can be pressed while being heated, so that the unevenness of the joint portion can be more reliably reduced. There is no restriction | limiting in particular about the heating mechanism of the press part 21, Various heating systems, such as an energization heating and induction heating, are employable. Specifically, for example, a sheathed heater 23 that can be stored in the pressing portion 21 can be suitably used.

  In the molding machine of this invention, what is necessary is just to have arrange | positioned the said press apparatus facing the outer peripheral surface of the molding drum 11, and, thereby, the effect of this invention can be acquired. Other points such as a specific structure of the molding drum can be configured according to a conventional method, and are not particularly limited. Further, the pressing device of the present invention may be provided with the pressing portion 21 divided in plural in the tire width direction, and the other specific configuration is configured in the same manner as the conventional pressing device. There is no particular limitation.

Next, a tire manufacturing method using the tire molding machine of the present invention will be described.
In the tire manufacturing method of the present invention, when the tire constituent member 11 is sequentially wound around the molding drum 10 to form a raw tire, the tire constituent member 11 is wound after the tire constituent member 11 is wound around the molding drum 10. 11 </ b> A is pressed using a pressing device disposed so as to face the outer peripheral surface of the molding drum 10. As a pressing device used at this time, a device having a plurality of pressing portions 21 divided in the tire width direction according to the present invention is used, and the joining portions 11A of the tire constituent member 11 are pressed by the plurality of pressing portions 21. Thus, it is possible to effectively suppress the occurrence of unevenness in the joint portion 11A.

  In the present invention, specifically, for example, it is preferable to press the plurality of pressing portions against the bonding portion at a heating temperature of 60 ° C. to 80 ° C. for about 5 to 10 seconds. If the pressing time is too short, a sufficient unevenness suppressing effect may not be obtained. On the other hand, if the pressing time is too long, no further effect can be obtained. On the other hand, if the heating temperature is too low, the effect of heating cannot be sufficiently obtained, and if it is too high, vulcanization proceeds and the rubber physical properties change, which is not preferable. Furthermore, the pressing pressure of the pressing portion can be specifically set to 0.5 to 5 MPa, for example. If the pressing pressure is too small, a sufficient unevenness suppressing effect may not be obtained.On the other hand, if it is too large, no further effect can be obtained. Since unevenness may occur, it is not preferable.

  Also in the production method of the present invention, in the molding process of the raw tire, it is sufficient if the joining portion of the tire constituent member is pressed using the pressing device disposed relative to the outer peripheral surface of the molding drum, As a result, the intended effect of the present invention can be obtained, and the other points can be configured according to a conventional method, and are not particularly limited. The green tire molded by the molding process is then expanded and vulcanized according to a conventional method using a vulcanizing device to become a product tire. According to the present invention, since the unevenness of the joint portion of the tire constituent member in the molding step can be reduced or eliminated, occurrence of product defects can be greatly reduced in the obtained product tire.

Hereinafter, the present invention will be described in more detail with reference to examples.
<Example 1>
As shown in FIG. 1, a pressing device having a molding drum 10 (outer diameter: 1820 mm) and 92 pressing portions 21 (material: iron) that are arranged to face the outer peripheral surface and are divided in the tire width direction. A green tire (tire size: 59 / 80R63) was molded using a tire molding machine including As shown in FIG. 2, the pressing portion 21 is driven by an air cylinder 22 and includes a sheathed heater 23. A surface 21 a of the pressing portion 21 that faces the outer peripheral surface of the molding drum 10 is arranged in the tire circumferential direction. It exhibited an R shape (curvature radius R: 900 mm) along.

  Specifically, after winding up to the carcass ply as a tire constituent member sequentially on the molding drum, the joining portion as the overlapping portion of the carcass ply generated when the ends are joined together is pressed by the pressing device. Pressed by part 21. As pressing conditions, when pressing was performed for 10 seconds at a pressing temperature of 80 ° C. and a pressing pressure of 5.0 MPa, the unevenness having a size of about 1.8 mm that was present in the joint portion disappeared.

<Example 2>
When pressing was carried out in the same manner as in Example 1 except that the pressing condition was set at a heating temperature of the pressing portion of 80 ° C. and a pressing pressure of 0.7 MPa for 2 seconds, a size of about 1.8 mm existing in the joint portion was obtained. The roughness was reduced to a size of 0.6 mm.

<Example 3>
When the pressing was performed in the same manner as in Example 1 except that the pressing part was not heated (room temperature) and the pressing pressure was 5.0 MPa for 20 seconds, a size of about 1.8 mm existing in the joint part was obtained. The roughness was reduced by about 0.1 mm to 0.2 mm. This result is shown in the graph of FIG. 3 together with the result when only the heating condition of the pressing part is changed to 60 ° C. and 80 ° C. From the graph results, it was found that an unevenness suppression effect of about 10% was obtained at room temperature, whereas a greater unevenness suppression effect of about 56 to 83% was obtained at 60 to 80 ° C.

  From the above results, by performing the tire molding process using the tire molding machine of the present invention, it is possible to reduce or eliminate irregularities in the joints of the tire constituent members, thereby suppressing the occurrence of product defects. It was confirmed that a great effect was obtained.

DESCRIPTION OF SYMBOLS 10 Molding drum 11 Tire structural member 11A Joint part 21 Press part 21a Surface 22 of a press part facing the outer peripheral surface of a molding drum Drive mechanism 23 Seeds heater

Claims (9)

In a tire manufacturing method including a step of forming a raw tire by sequentially winding tire components on a molding drum,
After the tire component member is wound on the molding drum, the joint portion of the tire component member is pressed using a pressing device disposed relative to the outer peripheral surface of the molding drum.
A method for manufacturing a tire, characterized in that, as the pressing device, one having a plurality of pressing portions divided in the tire width direction is used to press the joint portion of the tire constituent member by the plurality of pressing portions.   The tire manufacturing method according to claim 1, wherein the joined portion of the tire constituent member is pressed by the heated pressing portion.   The tire manufacturing method according to claim 1, wherein a surface of the pressing portion that faces the outer peripheral surface of the molding drum has an R shape along the tire circumferential direction. A pressing device that is disposed relative to the outer peripheral surface of a molding drum used for molding a raw tire and includes a pressing portion that presses a joining portion of a tire constituent member wound around the molding drum,
The pressing device, wherein the pressing portion is divided into a plurality in the tire width direction.   The pressing device according to claim 4, wherein the pressing portion can be heated.   The pressing device according to claim 4 or 5, wherein a surface of the pressing portion that faces the outer peripheral surface of the molding drum has an R shape along a tire circumferential direction. A tire molding machine including a molding drum used for molding a raw tire,
A pressing device that is disposed relative to the outer peripheral surface of the molding drum and presses a joining portion of a tire constituent member wound around the molding drum; and the pressing device is divided into a plurality of tire width directions. A tire molding machine having a pressing portion.   The tire molding machine according to claim 7, wherein the pressing portion can be heated.   The tire molding machine according to claim 7 or 8, wherein a surface of the pressing portion that faces the outer peripheral surface of the molding drum has an R shape along the tire circumferential direction.

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