JP4236527B2 - Tire molding die and tire molded using the tire molding die - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tire molding die and a tire manufactured using the tire molding die. More specifically, the invention eliminates a vent hole and suppresses the generation of spew dust, and further improves the appearance of the molded tire. The present invention relates to a tire mold and a tire manufactured using the tire mold.
[0002]
[Prior art]
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.
[0003]
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).
[0004]
[Patent Document 1]
Japanese Utility Model Publication No. 7-33615 microfilm (pages 1-3)
[Patent Document 2]
Japanese Utility Model Publication No. 62-13611 microfilm (pages 1-3)
[0005]
[Problems to be solved by the invention]
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.
[0006]
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.
[0007]
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.
[0008]
[Means for Solving the Problems]
Tire mold of the present invention for achieving the above Symbol purpose, a metal material are laminated through the joints cast by die casting, forming a fine gap by differential shrinkage of the metal material into the casting joints in the tire mold, to form a convex portion of the strip that the cast along the joints protrude from the surface of the mold, at the intersection between said mold surface the strip of protrusions The gist is that the concave groove is formed so that the depth gradually increases along the intersecting portion, and the deepest portion of the concave groove communicates with the cast joint portion .
[0010]
Moreover, it is good to manufacture a tire using the tire mold for this invention .
[0011]
In this way, when the mold is manufactured, a strip-shaped convex portion protruding from the mold surface is formed along the cast joint portion of the mold, and the intersection is formed in the intersecting portion between the mold surface and the strip-shaped convex portion. By forming a concave groove that communicates with the cast joint along the part, the tire can be molded with good air bleeding without generating many spews on the tire surface during tire vulcanization molding. It is possible to simplify the spew removal work of the process work and improve the work environment.
[0012]
Further, a tire molding die in which a concave groove communicating with the cast joint portion along the intersecting portion is formed in the intersecting portion between the surface of the mold and the belt-shaped convex portion. By making the tire formed with minute protrusions on the inner side, it is possible to obtain a product tire having a good appearance with few traces of spew removal.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0014]
FIG. 1 is a perspective view of one sector constituting a split-type tire molding die embodying the present invention. This tire molding die 1 is divided into a plurality of shots by die casting. The materials 1A and 1B are laminated, and a fine gap (for example, 0.005 to 0.08 mm, preferably 0.02 mm) is formed in the cast joint X of the laminated metal materials 1A and 1B due to a difference in metal shrinkage. is there.
[0015]
In other words, due to the difference in metal shrinkage, air and gas can pass through fine gaps, but rubber cannot pass through.If it is less than 0.005 mm, exhaust performance is insufficient, and conversely 0.08 If it exceeds mm, it becomes easy to form a spew.
[0016]
2 is a perspective view of a belt-like convex portion formed on the mold surface of the tire molding mold 1 of FIG. 1, and FIG. 3 is an enlarged cross-sectional view taken along line AA of FIG.
[0017]
In FIG. 1, reference numeral 2 denotes a buckling, 3 denotes a split mold attached to the buckling 2, 4 denotes a belt-like convex portion formed on the surface 3 a (inner surface) of the mold 3, and the tread of the tire W The concave / convex block 5 as shown in FIG. 4 is formed in the portion Wa.
[0018]
That is, according to the present invention, when the mold 3 is cast in a plurality of shots by die casting (see the Japanese Patent Application Laid-Open No. 2000-229322 for the manufacturing method of the mold), the mold A band-like convex portion 4 protruding from the surface 3 a of the mold 3 is formed along the cast joint portion 3 of the mold 3, and the intersection is formed in the intersection 4 a between the surface 3 a of the mold 3 and the belt-like convex portion 4. A concave groove 6 communicating with the cast joint portion X is formed along the portion 4a.
[0019]
The concave groove 6 is formed to be inclined at different depths toward the intersecting portion 4a, thereby making it possible to eliminate residual air.
[0020]
In addition, 7 shows the exhaust hole formed in the casting joint part X in the middle, This exhaust hole 7 is connected to the back surface side of the metal mold | die 3, and the air and gas which remain | survive in a metal mold | die are said groove | channel 6 and It is comprised so that it may discharge | release to air | atmosphere through the clearance gap between the casting joint parts X. FIG.
[0021]
Further, the depth of the concave groove 6 communicating with the cast joint portion X is preferably formed so as to continuously change from 0.1 mm to 0.5 mm, for example. Is slightly inferior, but the air removal function can be kept sufficiently.
[0022]
The tire molding die according to the present invention is configured as described above, so that at the time of tire vulcanization molding, a large number of spews are not generated on the surface of the tire, and air bleeding is performed on the concave groove 6 and the casting joint X. It can be efficiently performed through the clearance and the exhaust hole 7. Therefore, there is no spew, the spew removal work of the tire finishing process can be simplified, and the work environment can be improved.
[0023]
Further, when the tire W is vulcanized by the tire molding die thus configured, for example, as shown in FIG. 4, the minute protrusions 8 are formed inside the concave groove surface of the concave-convex block 4 of the tire tread portion Wa. Therefore, it is possible to obtain a product tire having a good appearance with few traces of spew removal.
[0024]
【The invention's effect】
Since the tire molding die 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. can be simplified spew removal work, Ru can to improve the work environment.
[0025]
In addition, by manufacturing a tire using the tire molding die of the present invention, a product tire having a good appearance with few traces of spew removal can be obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view of one sector constituting a split mold for molding a tire embodying the present invention.
FIG. 2 is a perspective view of a belt-like convex portion formed on the surface of a mold.
FIG. 3 is an enlarged cross-sectional view taken along the line AA in FIG.
FIG. 4 is a partial perspective view of a tire molded by the tire molding die according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tire shaping | molding metal mold | die 1A, 1B Metal material 2 Buckling 3 Split type | mold 3a Mold surface 4 Band-shaped convex part 4a Intersection part 5 Concavity and convexity block 6 Concave groove 7 Exhaust hole 8 Minute protrusion X Casting part W Tire Wa Tread

Claims (2)

The metal material layered with the joints cast by die casting, in tire mold forming a fine gap by differential shrinkage of the metal material into the casting joints,
To form the convex portions of the strip which along the cast joints protrude from the surface of the mold, at the intersection between said mold surface the strip of protrusions, depth along the crossing unit A tire molding die in which a concave groove is formed so as to be gradually deepened, and the deepest portion of the concave groove communicates with the cast joint . A tire manufactured using the tire molding die according to claim 1 .

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