JP4501413B2 - Tire molding die and tire manufactured using the tire molding die - Google Patents

Description

  The present invention relates to a tire molding die and a tire manufactured using the tire molding die. More specifically, the present invention relates to a tire formed by suppressing the generation of spew during tire molding and the generation of spew scraps. The present invention relates to a tire molding die with improved appearance and a tire manufactured using the tire molding die.

  Conventionally, a tire molding die used in a tire vulcanization process has a vent hole for exhausting air accumulated between the inner surface of the die and an unvulcanized tire to the outside of the die during tire vulcanization molding. A large number of narrow exhaust holes called “a” are formed.

  In particular, the mold part that forms the tire tread portion has a large number of uneven portions, and these uneven portions are isolated by groove blocks, and air tends to accumulate at the base end corners of the uneven portions, so the air is efficiently collected. A large number of vent holes are processed for exhaust (see, for example, Patent Document 1 and Patent Document 2).

  However, when a tire is vulcanized and molded with a mold having a large number of vent holes, the vulcanized rubber flows into the large number of vent holes, and a large number of spider-like protrusions (spews) are generated on the surface of the product tire.

For this reason, in the tire finishing process after the molding of the tire, it is indispensable to cut out the above spew, and it is not only possible to improve workability and productivity, but also a lot of cut spew scraps are scattered in the work environment. There is a problem that it is difficult to improve the appearance of the product tire.
Japanese Utility Model Publication No. 7-33615 Japanese Utility Model Publication No. 62-13611

    This invention was devised by paying attention to such conventional problems, and can be molded with good air bleeding without generating a large number of spews on the tire surface during tire vulcanization molding, and a tire finishing process A tire molding die that can simplify the spew removal work, improve the working environment, and improve the appearance of the product tire, and a tire manufactured using the tire molding die are provided. It is intended to do.

  In order to achieve the above object, the first tire molding die according to the present invention includes a first vent hole penetrating a skirt of a convex portion in a belt-like convex portion formed on the surface of the mold. And at least one vent hole assembly comprising a second vent hole that communicates with the first vent hole and communicates with the outside of the mold, and is formed on the mold surface and the mold surface. The present invention is summarized in that a concave groove is formed at the intersection with the belt-shaped convex portion along the bottom portion of the convex portion, and the concave groove is connected to the first vent hole.

  Here, the concave groove is formed so that the depth is different from one end side to the other end side along the skirt of the convex portion, and the first vent hole is formed in the deep portion of the concave groove. .

In addition, the tire molded with the first tire molding die described above is characterized in that minute protrusions are formed on the groove wall of the groove of the tire tread portion formed by the belt-like convex portion of the mold. To do.

According to a second tire molding die of the present invention, a first vent hole penetrating the skirt of the convex portion is formed in a belt-like convex portion formed on the surface of the mold, and communicated with the first vent hole. And at least one vent hole assembly including a second vent hole communicating with the outside of the mold, and an intersection of the surface of the mold and a belt-like convex portion formed on the surface of the mold A concave groove is formed along the bottom of the convex portion, and the concave groove and the first vent hole are connected to each other before the tire is inserted into the mold at both ends of the first vent hole. The gist is that both ends of the first vent hole are opened, and a plug for closing the vent hole by tire pressure is detachably mounted after the tire is inserted.

The tire molded by the second tire molding die is characterized in that minute crater-like protrusions are formed on the groove wall of the concave groove of the tire tread portion formed by the belt-like convex portion of the die. It is what.

  Since the mold of the present invention is configured as described above, it can be molded with good air venting without generating a large number of spews on the tire surface during tire vulcanization molding, and the spew removal work of the tire finishing process can be performed. It can be simplified and has the effect of improving the working environment.

Also, by molding the tire with the tire molding die of the present invention , crater-like minute protrusions are formed on the groove wall of the concave groove of the tire tread portion, so that the product with a good appearance with few traces of spew removal There is an effect which can be used as a tire.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a sectional view of a split mold showing a first embodiment of the present invention, FIG. 2 is a perspective view of the split mold, 1 is a mold, 2 is a surface 1a (inner surface) of the mold 1 ), And the uneven block 3 is formed on the tread portion Wa of the tire W as shown in FIG. 6, for example, by the surface 1 a of the mold 1 and the belt-shaped protrusion 2. Is.

  A first vent hole 4 having a diameter of about 1.5 mm to 2.5 mm that penetrates the skirt of the convex portion 2 is formed in both ends of the belt-shaped convex portion 2 formed on the surface 1a of the mold 1, and the first A substantially T-shaped vent hole assembly 6 is formed which is formed in a direction perpendicular to the vent hole 4 and communicates with the outside of the mold and having a second vent hole 5 having a diameter of about 1.5 mm to 2.5 mm. At least one vent hole assembly 6 is formed in the belt-like convex portion 2.

  At the intersection X between the surface 1a of the mold 1 and the belt-like convex part 2 formed on the surface 1a of the mold 1, a concave groove 7 is formed along the bottom part of the convex part 2. The concave groove 7 is formed to have different depths from one end side to the other end side along the skirt of the convex portion 2, and the first vent hole 4 is connected to a deep portion of the concave groove 7. It is formed to do.

In this way, at the intersection X between the vent hole assembly 6 composed of the first vent hole 4 and the second vent hole 5 and the belt-like convex portion 2 formed on the surface 1 a of the mold 1, the convex portion When the tire W is molded by a tire molding die in which a concave groove 7 connected to the first vent hole 4 is formed along the bottom portion of the groove 2 , the groove wall of the concave groove of the tread portion Wa as shown in FIG. A minute protrusion Q is formed on the surface. Therefore, the surface of the tread portion Wa of the tire W can be a product tire having a good appearance with few traces of spew removal.

Next, as shown in FIGS. 3 to 5, the mold 1 according to the reference embodiment of the present invention has a skirt of the convex portion 2 in the belt-shaped convex portion 2 formed on the surface 1 a of the mold 1. At least one vent hole assembly 6 including a first vent hole 4 that penetrates and a second vent hole 5 that communicates with the first vent hole 4 and communicates with the outside of the mold is formed. Plugs 8 as shown in FIGS. 4 and 5 are detachably attached to the openings at both ends of the vent hole 4.

  The plug 8 opens both ends of the first vent hole 4 before the tire W is inserted into the mold 1 and closes the first vent hole 4 by the pressure of the tire W after the tire W is inserted. It comprises a cylindrical portion 9 that fits into the exhaust cylinder portion 4a of the first vent hole 4, and a head portion 11 that abuts against a recess 10 having a step, and the exhaust cylinder portion 4a The head portion 11 is formed with an on-off valve portion 12 that communicates or blocks the first vent hole 4 and the concave groove 7 inside the mold.

  The on-off valve portion 12 has a valve function of opening the first vent hole 4 before inserting the tire into the mold 1 and closing the first vent hole 4 by the crimping force of the tire W after inserting the tire. Thus, at least one portion on the bottom surface side of the head portion 11 that contacts the concave portion 10 is cut to reduce the thickness, and the cut portion 13 is cut to the communication passage 9 a of the tubular portion 9.

  Therefore, when the tire W is inserted into the mold 1, the thin head portion 11 contacts the recess 10 by the pressure to block the communication path 9 a from the interior of the mold 1, Before inserting the tire into the mold 1, the air between the mold 1 and the tire W can be exhausted to the outside with the first vent hole 4 opened. Therefore, the vulcanized rubber in the molten state at the time of tire vulcanization does not flow into the first vent hole 4, and spew can be prevented.

In the tire molded by the mold 1 according to the reference embodiment , the crater-shaped minute protrusion Q is formed on the groove wall of the concave groove of the tire tread portion Wa, and therefore, the spew is formed on the surface of the tread portion Wa of the tire W. It is possible to obtain a product tire having a good appearance with few traces of removal.

Next, a mold 1 according to a second embodiment of the present invention is a combination of the first embodiment and the reference embodiment . In the belt-like convex portion 2 formed on the surface 1a of the mold 1, the mold 1 At least one vent hole assembly 6 comprising a first vent hole 4 penetrating the skirt of the convex portion 2 and a second vent hole 5 communicating with the first vent hole 4 and communicating with the outside of the mold. The above is formed.

  A groove 7 is formed along the hem of the protrusion 2 at the intersection X between the surface 1a of the mold 1 and the belt-like protrusion 2 formed on the surface 1a of the mold 1. The concave groove 7 is connected to the openings at both ends of the first vent hole 4. Further, both end openings of the first vent hole 4 are opened at both ends of the first vent hole 4 before the tire is inserted into the mold 1 and the first vent hole 4 is opened by the pressure of the tire W after the tire is inserted. A plug 8 as shown in FIGS. 4 and 5 for closing the opening at both ends of the vent hole 4 is detachably mounted.

And as the tire W shape | molded by the metal mold | die 1 of such 2nd Embodiment , the crater-like microprotrusion is formed in the groove wall of the ditch | groove of the tire tread part Wa, and the tread part Wa of the tire W is formed. The surface of the tire can be a product tire having a good appearance with few traces of spew removal.

Since other configurations and operations are the same as those in the first embodiment and the reference embodiment , the same reference numerals are given and description thereof is omitted.

1 is a sectional view of a split mold showing a first embodiment of the present invention. It is a perspective view of the division type metal mold | die of 1st Embodiment of this invention. It is the perspective view which the metal mold | die which shows the reference form of this invention cut away partially. It is an AA arrow expanded sectional view of FIG. It is an expansion perspective view of the plug with which both ends opening parts of the 1st vent hole are equipped. It is explanatory drawing of the tire shape | molded by the metal mold | die of 1st Embodiment , reference form, and 2nd Embodiment .

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mold 1a Surface 2 Convex part 3 Block 4 1st vent hole 5 2nd vent hole 4a Exhaust cylinder part 6 Vent hole assembly 7 Concave groove 8 Plug 9 Cylindrical part 9a Communication path 10 Concave part 11 Head part 12 Opening and closing valve part 13 Notch W Tire Wa Tread X Crossing

Claims (5)

  In a belt-like convex portion formed on the surface of the mold, a first vent hole that penetrates the bottom of the convex portion, a second vent hole that communicates with the first vent hole and communicates with the outside of the mold, Forming at least one bent hole assembly comprising a groove at the intersection of the surface of the mold and the belt-shaped protrusion formed on the surface of the mold along the bottom of the protrusion. A tire molding die characterized by being formed and connecting the concave groove and the first vent hole.   2. The concave groove according to claim 1, wherein the concave groove is formed to have different depths from one end side to the other end side along a skirt of the convex portion, and a first vent hole is formed in a deep portion of the concave groove. Tire mold. A tire formed by forming minute protrusions on a groove wall of a concave groove of a tire tread portion formed by a belt-like convex portion of the die by using the tire molding die according to claim 1 .   In a belt-like convex portion formed on the surface of the mold, a first vent hole that penetrates the bottom of the convex portion, a second vent hole that communicates with the first vent hole and communicates with the outside of the mold, At least one vent hole assembly made of the above is formed, and a groove is formed at the intersection of the surface of the mold and the belt-shaped protrusion formed on the surface of the mold along the bottom of the protrusion. In addition, the concave groove is connected to the first vent hole, and both end openings of the first vent hole are opened at both end openings of the first vent hole before the tire is inserted into the mold. A tire molding die that is detachably mounted with a plug that closes the vent hole due to the pressure of the tire after insertion. A tire formed by forming minute crater-like protrusions on a groove wall of a concave groove of a tire tread portion formed by a belt-like convex portion of the die by using the tire molding die according to claim 4. .

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