JP4986224B2 - Rubber mold back cylinder, rubber mold manufacturing method using the same, and rubber mold - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a rubber mold back cylinder (hereinafter also simply referred to as “back cylinder”), a rubber mold manufacturing method using the rubber mold (hereinafter also simply referred to as “manufacturing method”), and a rubber mold. The present invention relates to a rubber mold back cylinder used in a rubber mold manufacturing process which is one process of manufacturing an aluminum (AL) alloy mold, a rubber mold manufacturing method using the rubber mold, and a rubber mold.

  When manufacturing a tire, a pressure is applied to the molded green tire from the inside, the outer surface is brought into close contact with the inner wall of the heated mold, and a vulcanizing mold (hereinafter referred to as vulcanized rubber) is vulcanized by heat and pressure. , Referred to as “tire mold”). Such a tire mold is generally made of an AL alloy or the like, and is manufactured by a casting method in which a mold on which a tire tread pattern is transferred is placed in the center of a mold and molten metal is poured into the mold (for example, a patent) Literature 1 etc.).

  Specifically, in this method, first, a tread pattern of a tire to be cast is precisely processed and manufactured with a wooden mold (wood resin). Next, the obtained wood resin tread model is molded with rubber to produce a tire pattern (design) and a rubber mold that is an inverted mold of the tire tread shape. Thereafter, a mold compounding composition such as gypsum is poured onto a rubber mold from which the tread pattern is cast and cured to obtain a mold on which the tread pattern is transferred. By pouring a molten metal such as an AL alloy into the mold thus produced, a tire mold as the final object is produced.

  Conventionally, when a wood resin tread model in which a tire pattern shape is dug as described above is molded with rubber, a method as shown in FIG. 2 has been used.

  First, as shown in FIG. 2 (a), a tread model 30 and a back serving as a rubber-type support are placed in a core frame (frame body) 20 assembled with parts called upper and lower plates and left and right side frames. Set the barrel 11. Here, the back cylinder 11 needs to be manufactured in consideration of dimensions in advance so that a space for allowing rubber to flow between the tread model 30 and the tread model 30 when set in the core frame 20.

  In addition, a through hole 12 is provided in the back cylinder 11 in advance for pouring liquid rubber between the tread model 30 and the back cylinder 11. Furthermore, a primer-based adhesive 13 for securing adhesiveness to the rubber is applied to the back cylinder 11 before pouring the liquid rubber (before setting it on the core frame 20).

In this state, as shown in FIG. 2 (b), the liquid rubber 14 is poured into the core frame 20 in which the tread model 30 and the back cylinder 11 are set, from the through holes 12 formed in the back cylinder 11. Thereafter, heating for promoting vulcanization is performed, the liquid rubber 14 is cured, and then demolded, whereby a desired rubber mold 40 as shown in FIG. 2C can be obtained. .
JP 2005-169929 A

  In the manufacturing process of the rubber mold as described above, in order to prevent air from remaining in the rubber part in the rubber mold, after the pouring of the liquid rubber is completed, the core frame is vacuum-released before heating. The internal air is evacuated by a gas device.

  However, in this case, since the air escape path is one place of the through hole into which the liquid rubber has been poured, the internal air is difficult to escape and a sufficient deaeration effect cannot be obtained, and the air remains in the rubber part. In some cases, the rubber would harden. If air remains inside the rubber part, this residual air expands and contracts due to changes in the environmental temperature during use of the rubber mold, and changes the rubber mold dimensions, making it impossible to accurately replicate the tire tread. There was a need to manage the environment and rubber mold temperature very nervously.

  Further, as described above, in the obtained rubber mold 40, the rubber part 15 formed by curing the liquid rubber and the back cylinder 11 are usually bonded with the primer adhesive 13, but the rubber part is externally applied. 15 may peel off from the back cylinder 11. If foreign matter such as mold gypsum debris enters between the peeled rubber and the back cylinder, the rubber part will rise and deform the rubber mold shape, making it impossible to accurately replicate the tire tread. It is important to integrate the part and the back cylinder more securely.

  Furthermore, since the primer-based adhesives that are conventionally used have a bad odor and high volatility, there is a problem that special handling is required at the time of use. Specifically, it is obliged to work at a designated place with a local exhaust system, and to wear protective glasses and a mask, and sufficient care is required for handling. Therefore, it is desirable that the rubber part and the back cylinder can be integrated without using a primer-based adhesive.

  From the above, the object of the present invention is to firmly fix the rubber part and the back cylinder without using a primer-based adhesive to prevent the rubber part from peeling off, and to ensure more reliable degassing from the rubber part. It is an object of the present invention to provide a technique for preventing the occurrence of a rubber mold defect and enabling accurate tire tread replication.

  As a result of intensive studies, the inventor has improved the shape of the back cylinder so that the entire rubber part can be held by the back cylinder, so that the rubber and the back cylinder can be more firmly integrated. The inventors have found that this can be solved, and have completed the present invention.

  That is, the present invention relates to a rubber mold back cylinder that is fixed to a rubber part having a mold surface obtained by molding a tread pattern of a tire and reinforces the rubber part, and the back surface of the rubber part mold surface A rubber mold manufacturing method using a rubber mold back cylinder made of gypsum or an aluminum alloy having a plurality of through holes provided in a direction, wherein the tread pattern of the tire is formed in a frame A model is arranged, and after the rubber mold back cylinder is arranged in the frame and above the tread model, the liquid is introduced into the frame through the plurality of through holes of the rubber mold back cylinder. After injecting the rubber composition and filling the liquid rubber composition to a position beyond the through hole of the rubber mold back cylinder, the liquid rubber composition is vulcanized and cured to form the rubber part. It is characterized by.

  In the rubber mold manufacturing method of the present invention, it is not necessary to apply an adhesive to the surface of the rubber mold back cylinder that comes into contact with the rubber part.

  Furthermore, the present invention is a rubber mold manufactured by the method for manufacturing a rubber mold of the present invention.

  According to the present invention, with the above-described configuration, the rubber and the back cylinder can be firmly fixed without using a primer-based adhesive, and the peeling of the rubber can be prevented. Certain degassing is also possible. Therefore, it is possible to prevent the occurrence of defective rubber molds in the next process of manufacturing the tire mold, thereby contributing to accurate duplication of the tire tread.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.
The present invention relates to an improvement in the shape of a rubber mold back cylinder which is fixed to a rubber part having a mold-taking surface obtained by shaping a tread pattern of a tire and reinforces the rubber part.

  FIG. 1A to FIG. 1C are explanatory views relating to a rubber mold manufacturing method using the rubber mold back cylinder 1 of the present invention. As shown in the figure, the rubber mold back cylinder 1 of the present invention has a plurality of through-holes 1 </ b> A provided in the back direction of the mold taking surface X of the rubber part 3.

  Thereby, in the rubber mold 10 to be obtained, the rubber part 3 has the back cylinder 1, the tread-shaped part rubber 3a on the mold taking surface X side, the intermediate part rubber 3b filled in the through hole 1A, and the back side rubber. The structure is to be sandwiched between the reservoir rubber 3c (see FIG. 1C), and the rubber part 3 and the back cylinder 1 are firmly integrated and fixed without using a primer-based adhesive. be able to. Accordingly, it is possible to reliably ensure the quality (shape) of the product tire by preventing the rubber portion 3 from peeling off from the back cylinder 1 and maintaining the shape of the rubber mold 10.

  Further, by providing a plurality of through holes 1A in the back cylinder 1, the liquid rubber composition 2 can be poured through the through holes 1A, and at the time of degassing after pouring, the liquid rubber composition 2 The air remaining in the inside can be discharged more easily and effectively, and sufficient deaeration can be performed. As a result, in the rubber mold 10 obtained by using the back cylinder 1, the expansion and contraction of the remaining air due to the temperature change do not occur, so the rubber mold dimensions are not changed, and as a result, the original dimensions are accurately guaranteed. It is possible to make a precise replica of the tire tread.

  Furthermore, since it is not necessary to use an adhesive such as a conventional primer-based adhesive in the present invention, local exhaust equipment is not required, and the use of protective glasses, a mask, etc. is not required. It is possible to improve the environment in a safer direction.

  The back cylinder 1 of the present invention may be formed of any material as long as the shape does not change during the production and use of the rubber mold, and preferably has a shape such as a metal such as gypsum or an aluminum alloy. A material with very little change can be used. Moreover, if the back cylinder 1 of the present invention has a plurality of through-holes 1A capable of fixing the rubber part 3, pouring and degassing the liquid rubber, the overall shape thereof is particularly It is not limited. Further, the number of through-holes 1A can be appropriately determined according to the size of the tire to be molded, the size of the tread surface, and the like, and is not particularly limited. However, the fixing of the rubber part 3, the pouring of liquid rubber and the like From the viewpoint of easily degassing, it is preferable to provide three or more. Moreover, as a diameter of 1 A of through-holes, it can be set as (phi) 10-50 mm from the same viewpoint, for example.

Next, the procedure for manufacturing the rubber mold 10 using the back cylinder 1 of the present invention will be described below.
First, as shown in FIG. 1A, a tread model 30 in which a tread pattern of a tire is formed is arranged in a frame (core frame) 20, and inside the frame 20 and above the tread model 30. The back cylinder 1 is arranged.

  Next, the liquid rubber composition 2 is injected into the frame body 20 through the plurality of through holes 1A of the back cylinder 1, and the liquid rubber composition 2 is filled to a position beyond the through holes 1A of the back cylinder 1 ( FIG. 1 (b)). Then, the rubber mold 10 in which the back cylinder 1 and the rubber part 3 are integrated can be obtained by vulcanizing and curing the liquid rubber composition 2 to form the rubber part 3 (FIG. 1 (c)). ). In this case, as described above, it is not necessary to apply an adhesive to the surface of the back cylinder 1 that contacts the rubber part 2.

(A)-(c) is explanatory drawing which shows the manufacturing method of the rubber type | mold which concerns on one embodiment of this invention. (A)-(c) is explanatory drawing which shows the manufacturing method of the conventional rubber mold.

Explanation of symbols

1,11 Rubber mold back cylinder 1A, 12 Through hole 2,14 Liquid rubber composition 3,15 Rubber part (3a tread shape part rubber, 3b intermediate part rubber, 3c rubber reservoir part rubber)
10, 40 Rubber mold 13 Primer adhesive 20 Frame (core frame)
30 Tread model X

Claims (3)

A rubber mold back cylinder that is fixed to a rubber portion having a molding surface obtained by molding a tread pattern of a tire and reinforces the rubber portion, and is provided facing the back side of the molding surface of the rubber portion. , A rubber mold manufacturing method using a rubber mold back cylinder made of gypsum or aluminum alloy having a plurality of through holes , wherein a tread model in which a tread pattern of the tire is formed in a frame body, After the rubber mold back cylinder is disposed in the frame and above the tread model, the liquid rubber composition is injected into the frame through the plurality of through holes of the rubber mold back cylinder. The rubber part is formed by filling the liquid rubber composition to a position beyond the through hole of the rubber mold back cylinder, and then vulcanizing and curing the liquid rubber composition to form the rubber part. Manufacturing method. The rubber mold for back barrel, The process according to claim 1 Rubber-type wherein no adhesive is applied to the surface in contact with the rubber portion.   A rubber mold manufactured by the method for manufacturing a rubber mold according to claim 1.

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