JP2006150603A - Tire mold, plug therefor and tire manufactured using tire mold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vent hole plug for a tire mold which enables the omission of spew removing work of a tire or the improvement of a work environment, the enhancement of the appearance of a product tire and the easy cleaning or the like of the mold, and the tire manufactured using the tire mold. <P>SOLUTION: A holder 4 made of a metal is constituted by providing guide holes 6a and 6b to the opposed positions of the side surface of an exhaust cylinder part 4a and forming the lower guide hole 6b as the slot in its axial direction and a tapered recessed fitting part is formed to the upper part of the exhaust cylinder part 4a. A plug member 5 is constituted of the tray-shaped head part 5a fitted to the fitting part and a shaft part 5b to which through-holes 9a and 9b permitting the insertion of guide elastically deformable spring pins 8a and 8b formed thereto a formed. A gap is formed between the holder 4 and the plug member 5 by the elastic force of the spring pin 8a before the insertion of the tire of the mold and closed by the pressure of the tire after the insertion of the tire. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a tire molding die, a plug for a tire molding die, and a tire manufactured using the tire molding die, and more particularly, without generating spew on the tire surface during tire vulcanization molding. Tire molding mold that can be molded, improved tire finishing process work, and can improve the appearance of the product tire, plug used in the vent hole of the tire molding mold, and tire manufactured using this tire molding mold It is about.

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

  These numerous vent holes are generally machined into areas where mold air is likely to remain. For example, they are machined into 8 or more places on the same circumference of the mold corresponding to bead rings, rims, side portions, etc. The number of circumferential rows varies depending on the tire shape.

  Further, one or more vent holes in the mold design block surrounded by the groove of the tire tread portion are processed (for example, see Patent Document 1).

  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 molding the tire, it is indispensable to excise the above spew, which not only hinders workability and productivity, but also a lot of excised spew scraps are scattered to deteriorate the working environment. There was a problem that it was difficult to improve the appearance of the product tire.

  In addition, tire vulcanization molds have been proposed in which each vent hole is provided with a valve configured to close the vent hole during tire vulcanization and open the opening of the vent hole when the tire is released (for example, , See Patent Document 2).

However, the valve used for the vent hole of such a tire vulcanizing mold may adhere to the tire when it is released from the tire, and when the mold is cleaned, the abrasive flows into the valve and the valve operates. There was a problem of being lost.
Japanese Utility Model No.7-33615 microfilm JP 9-141660 A

  This invention has been devised by paying attention to such conventional problems, can be molded without generating spew on the tire surface during tire vulcanization molding, can eliminate the spew removal work of the tire finishing process work, A tire molding die that can improve the working environment, improve the appearance of the product tire, and can easily clean the mold, a plug for the tire molding die, and the tire molding An object of the present invention is to provide a tire manufactured using a mold.

  In order to achieve the above object, according to the present invention, a tire mold according to the present invention is provided with a guide hole at least at one or more positions opposite to each other in the longitudinal side surface of each vent hole formed in the mold. And a plug made of a cylindrical metal holder having a long hole, and a resin plug member having a through hole connected to the holder through a spring pin so as to be slidable in the longitudinal direction. Before inserting the tire into the mold, the member forms a gap between the holder and the head portion of the plug member by the elastic force of the spring pin, and after inserting the tire, the upper portion of the holder and the head portion of the plug member are The gist is that the gap is closed.

  Further, the tire molding die plug according to the present invention includes a cylindrical metal holder that is detachably attached to a vent hole formed in the die, and a resin plug member that is fitted to the holder. A plug for a tire molding die connected through the metal holder, wherein the metal holder includes at least one guide hole and a guide hole at opposite positions on the side surface of the exhaust tube portion formed in the center portion. A long hole is formed, and a tapered concave fitting portion is formed at the upper portion of the exhaust tube portion. The stopper member is a dish-shaped head portion that fits into the tapered concave fitting portion of the holder, and a guide It is composed of a shaft portion provided with at least one through hole through which the spring pin can be inserted, and a spring pin that connects the hole and elongated hole of the holder and the through hole of the plug member. is there.

  Here, a guide hole and a long hole are formed at predetermined positions in the longitudinal direction at opposite positions on the side surfaces of the exhaust tube portion of the metal holder, and the resin plug member is A long hole-like through hole into which a spring pin can be inserted is formed in the shaft portion corresponding to the guide hole and the long hole of the holder, and the resin plug member is a heat-resistant resin material. Is formed integrally.

  In addition, a tire manufactured using the tire molding die has a metal die fitted with a metal holder and a resin plug member fitted to the holder in a number of vent holes formed in the die. The tire is manufactured by molding the surface smoothly with a mold.

  In this way, each of the vent holes formed in the mold has a cylindrical metal holder in which a guide hole and a long hole are formed in at least one of the opposing positions on the side surfaces in the longitudinal direction, A plug made of a resin plug member having a through hole connected to a holder through a spring pin so as to be slidable in the longitudinal direction is mounted. The plug member is inserted into the mold before the tire is inserted into the holder and the plug member. A gap is formed by the elastic force of the spring pin between the head part of the tire and the gap between the upper part of the holder and the head part of the plug member is closed by the tire pressure after inserting the tire. Can be formed without generating spew on the tire surface, can eliminate the spew removal work of the tire finishing process work, can improve the working environment, and can improve the appearance of the product tire .

Since the present invention is configured as described above, the following excellent effects can be obtained. (a) During tire vulcanization molding, molding can be performed without generating spew on the tire surface.
(b) The spew removal work of the tire finishing process can be omitted.
(c) The work environment can be improved because there is little spew scrap.
(d) It is possible to reduce the cost of materials.
(e) The appearance of the product tire can be improved.
(f) When the mold is cleaned, since the bottom surface of the plug composed of the holder and the plug member is opened, no abrasive is deposited in the plug.
(g) When the tire is released from the mold, the plug is not dropped or removed, so that the workability can be improved.

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

  FIG. 1 is a partially enlarged cross-sectional view of a tire molding die in which a plug is attached to a vent hole formed in a die embodying the present invention, where 1 is a tire molding die and 2 is a tire vulcanization molding. A vent hole 3 formed in the mold 1 for exhausting the air accumulated between the mold 1 and the tire W, 3 is a metal holder 4 mounted on the vent hole 2, and a resin plug member 5. A plug consisting of is shown.

  In this embodiment, each vent hole 2 formed in the mold 1 is formed with a through hole 2a penetrating from the inner surface 1a of the mold 1 to the outside, and inside the through hole 2a of each vent hole 2 1 to FIG. 3 is fitted into a cylindrical holder 4 integrally formed of a heat-resistant metal material such as stainless steel or aluminum alloy, and an exhaust tube portion 4 a of the holder 4. A plug 3 comprising a plug member 5 integrally formed of a heat resistant resin material (for example, polytetrafluoroethylene) is detachably mounted.

  As shown in FIGS. 1 and 2, the metal holder 4 has at least one or more positions opposed to each other on the side surface of the exhaust cylinder portion 4a formed at the center portion, and in this embodiment, has a predetermined interval. Guide holes 6a and 6b are formed at two locations. In the first embodiment, one of the lower guide holes 6b is formed as an elongated hole extending in the axial direction, and the exhaust tube portion 4a. A tapered fitting portion 7 is formed on the upper portion of the.

  Further, as shown in FIG. 3, the plug member 5 fitted to the exhaust cylinder portion 4a includes a dish-shaped head portion 5a fitted to the tapered concave fitting portion 7 of the holder 4, and a guide. The shaft portion 5b is formed with through holes 9a, 9b into which elastically deformable spring pins 8a, 8b can be inserted, and the through holes 9a corresponding to the guide holes 6a on the upper side of the holder 4 extend in the axial direction. The guide spring pin 8a is inserted and connected to the through hole 9a and the guide hole 6a, and the through hole 9b corresponding to the lower guide hole 6b is The guide spring pin 8b has a slightly larger diameter, and the one-side elongated hole 6b and the through hole 9b are connected by a guide spring pin 8b.

  The guide holes 6a and 6b and the through holes 9a and 9b through which the spring pins 8a and 8b are formed in the shaft portion 5b of the metal holder 4 and the plug member 5 can be inserted into the spring pins 8a and 8b. Any number of holes and long holes can be formed, and the number can be set arbitrarily.

  With this configuration, the plug member 5 and the holder 4 are always connected by spring pins 8 a and 8 b that are elastically deformable, and the plug member 5 slides in the vertical direction along the exhaust tube portion 4 a of the holder 4. It is possible. That is, before inserting the tire W into the mold 1, as shown in FIGS. 1 and 4, the head portion 5a of the plug member 5 is tapered on the upper portion of the exhaust cylinder portion 4a by the spring pins 8a and 8b for guide. It is in a state where it is lifted upward from the concave fitting portion 7.

  As a result, air flows between the tapered concave fitting portion 7 of the metal holder 4 and the dish-like head portion 5a of the plug member 5 during tire vulcanization, but rubber does not flow into 0.02-2.0. A gap H of mm is formed, and the air in the mold enters the exhaust cylinder portion 4a through the gap H between the holder 4 and the plug member 5, and is exhausted from the lower part of the vent hole 2 to the outside of the mold. The

  When the tire W is inserted into the mold 1, as shown in FIGS. 1 and 5, the dish-shaped head portion 5 a is elastically deformed by the guide spring pins 8 a and 8 b by the pressing force of the tire W. Therefore, the dish-shaped head portion 5a is brought into close contact with the tapered fitting portion 7 of the holder 4 to close the upper opening portion of the exhaust tube portion 4a. As a result, the rubber material melted at the time of vulcanization does not flow into the exhaust cylinder portion 4a.

  In this embodiment, the inclination angle α1 of the tapered concave fitting portion 7 is formed around 20 °, but is not limited to this angle, and the tapered concave shape of the plug member 5 is not limited thereto. In this embodiment, the inclination angle α2 of the dish-like head portion 5a fitted to the fitting portion 7 is formed at around 45 °, but is not limited to this angle.

  6 and 7 show the guide holes 6a and 6b of the metal holder 4, the through holes 9a and 9b of the plug member 5 fitted to the exhaust tube portion 4a, and an elastically deformable guide. A second embodiment showing the relationship with the spring pins 8a, 8b is shown. In this embodiment, one of the upper and lower opposing guide holes 6a, 6b formed in the metal holder 4 is shaped like a long hole. The elongated holes 6a and 6b are connected to the through holes 9a and 9b of the plug member 5 by spring pins 8a and 8b that can be elastically deformed.

  Similarly to the first embodiment, this embodiment also uses the spring pins 8a and 8b to plug the tire W before insertion of the tire W into the mold 1 due to the elastic force of the spring pins 8a and 8b, as shown in FIG. 5 head portion 5a is in a state of being lifted upward from the tapered concave fitting portion 7 on the upper portion of the exhaust tube portion 4a, thereby the tapered fitting portion 7 of the metal holder 4; A gap H of 0.02 to 2.0 mm is formed between the plug member 5 and the dish-shaped head portion 5a when the tire is vulcanized, but rubber does not flow. Passing through the gap between the holder 4 and the plug member 5 enters the exhaust cylinder portion 4a and is exhausted from the bottom of the vent hole 2 to the outside of the mold.

  When the tire W is inserted into the mold 1, the dish-shaped head portion 5a resists the elastic deformation force of the guide spring pins 8a and 8b by the pressing force of the tire W as shown in FIG. As a result, the dish-shaped head portion 5a is brought into close contact with the tapered concave fitting portion 7 of the holder 4 to close the upper opening of the exhaust tube portion 4a. As a result, the rubber material melted at the time of vulcanization does not flow into the exhaust cylinder portion 4a.

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

  When the tire W is molded by the mold 1 in which the plug 3 composed of the metal holder 4 and the resin plug member 5 is mounted in the large number of vent holes 2 as described above, as described above, the mold 1 Before inserting the tire into the inside, the exhaust is exhausted from the lower part of the exhaust cylinder part 4a of the holder 4 and the plug member 5 to the outside of the mold. After the tire W is inserted, the dish-shaped head portion 5a is brought into close contact with the tapered concave fitting portion 7 of the holder 4 due to the pressure of the tire 1 to close the upper opening of the exhaust tube portion 4a. At this time, the vulcanized rubber in a molten state does not flow into the exhaust tube portion 4a or the vent hole 2, and therefore, spew is not generated. Therefore, the surface having a smooth surface as shown in FIG. Tires can be manufactured.

It is a partial expanded sectional view of the tire shaping die which attached the plug to the vent hole formed in the metallic mold of this invention. It is an expanded sectional view of the holder in a 1st embodiment of this invention. It is an expanded sectional view of the stopper member in a 1st embodiment of this invention. It is a principal part expanded sectional view which shows the relationship between the holder and tire plug member before tire insertion. It is a principal part expanded sectional view which shows the relationship between the holder and tire plug member after tire insertion. It is an expanded sectional view which shows the relationship between the holder before the tire insertion which shows other embodiment of this invention, and a plug member. It is an expanded sectional view which shows the relationship between the holder after tire insertion which shows other embodiment of this invention, and a plug member. It is a partial perspective view of the tire manufactured with the tire shaping die of this invention.

Explanation of symbols

W Tire 1 Mold 1a Inner surface 2 Vent hole 2a, 2b Through hole 3 Plug 4 Holder 4a Exhaust cylinder 4b Exhaust hole 5 Plug member 5a Head 5b Shaft 6a, 6b Guide hole 7 Fitting 8a , 8b Spring pin 9a, 9b Through hole W Tire H Gap α1, α2 Inclination angle

Claims (6)

In a tire molding die provided with a number of vent holes for exhausting air accumulated between the die and the tire during tire vulcanization molding,
A cylindrical metal holder in which a guide hole and an elongated hole are formed in at least one of the opposing positions on the side surfaces in the longitudinal direction in each vent hole formed in the mold, and a spring pin in the holder A plug made of a resin plug member having a through hole connected so as to be slidable in the longitudinal direction through the plug is mounted, and the plug member is a holder and a head portion of the plug member before inserting the tire into the mold. Is formed by a spring pin elastic force between the upper portion of the holder and the tire pressure after the tire is inserted to close the gap between the upper portion of the holder and the head portion of the plug member. This is a tire molding die plug in which a cylindrical metal holder detachably mounted in a vent hole formed in a die and a resin plug member fitted to the holder are connected via a spring pin. And
The metal holder has at least one guide hole and a long hole at opposite positions on the side surface of the exhaust tube portion formed in the center portion, and has a tapered concave shape at the upper portion of the exhaust tube portion. Forming a fitting portion, the plug member is provided with a dish-shaped head portion that fits into the tapered concave fitting portion of the holder and at least one through hole through which a spring pin for guide can be inserted. A tire molding die plug comprising a shaft portion and a spring pin that connects the hole and slot of the holder and the through hole of the plug member. The tire mold plug according to claim 2, wherein a guide hole and a long hole are formed at predetermined positions in the longitudinal direction at opposite positions on the side surfaces of the exhaust tube portion of the metal holder. . 3. The tire molding according to claim 2, wherein the resin-made plug member has a long hole-like through hole into which a spring pin can be inserted, corresponding to the guide hole and the long hole of the holder, in the shaft portion. Plug for mold. 5. The plug for a tire molding die according to claim 2, 3 or 4, wherein the resin plug member is integrally formed of a heat-resistant resin material. A tire having a smooth surface formed by a mold having a metal holder and a resin plug member fitted to the holder in a number of vent holes formed in the mold.

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