JPH085066B2 - Tire vulcanization mold - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a tire vulcanizing mold. More specifically, the so-called split mold,
The present invention relates to a tire vulcanizing mold capable of preventing rubber from protruding, distortion of the mold, and damage.

[0002]

2. Description of the Related Art Conventionally, there are two methods for vulcanizing and manufacturing tires, one is using a full mold and the other is using a split mold, but recently, the use of split molds has been increasing for the purpose of improving tire uniformity. There is a tendency.

[0003]

However, since the split mold constitutes a set of molds by combining a plurality of divided parts, the divided boundaries (hereinafter, referred to as
The burrs occur on the tire product surface due to the split position). Especially when the split position overlaps with the groove in the tire pattern, that is, when it is in the groove, the mold rigidity of that part is lower than other parts, and its durability deteriorates. However, there is a problem that the rubber tends to be squeezed out, the mold is distorted, and the mold is damaged. Also, when manufacturing a tire with siping in the tire pattern,
If the split position is too close to the siping knife blade, in the worst case, it may lead to missing siping.

In view of the above circumstances, it is an object of the present invention to provide a tire vulcanizing mold capable of preventing rubber from protruding, distortion of the mold, and damage.

[0005]

[MEANS FOR SOLVING THE PROBLEMS] According to the present invention, a mold used for vulcanizing and manufacturing a tire, the mold comprising a plurality of molds, among the split positions in the direction along the outer periphery of the tire, Those located in the buttress portion are formed at positions corresponding to side surfaces other than the decoupling groove that extends in the circumferential direction, and those located in the tread crown portion are formed at positions that do not overlap with the groove extending in the tire outer circumferential direction. There is provided a tire vulcanizing mold formed such that a split position in the width direction of the tire does not overlap with a groove extending in the tire width direction.

Further, according to the present invention, a mold comprising a plurality of molds, which is used when vulcanizing and manufacturing a tire having sipings in a tire pattern, among the split positions in the direction along the outer periphery of the tire. , The decoupling located in the buttress of the tire extends in the circumferential direction.
It is formed at a position corresponding to the side surface portion other than the groove, and the one located at the tread crown portion is formed at a position that does not overlap with the groove extending in the tire outer circumferential direction, and the split position in the width direction of the tire is in the tire width direction. There is provided a tire vulcanizing mold which is formed at a position that does not overlap the extending groove and has a split position at a position separated by 1.5 mm or more from the end of the knife blade.

In the present specification, "not overlapping" means that the split position is not located in the groove or is not formed.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, in the mold of the present invention, the outermost split position 7 (located at the buttress portion of the tire) in the direction along the tire outer periphery is located further outside than the decoupling groove 5. The other split positions 6 (positions on the tread crown portion) are formed at positions that do not overlap the circumferential groove 3 extending in the tire outer circumferential direction. Further, the split position 8 in the tire width direction is formed at a position not overlapping the radial groove 4 extending in the tire width direction. Further, in the mold of the present invention, when manufacturing a tire in which the siping 11 exists in the tire pattern, a split position is formed at a position separated by 1.5 mm or more from the end of the knife blade. If the split position is closer than 1.5 mm from the edge of the knife blade, rubber will easily stick out on the tire. That is, there arises a problem that the mold durability of the portion is lowered.

Since the mold of the present invention is constructed as described above, the durability of the mold can be secured and stabilized, and rubber squeezing out, distortion of the mold, and damage generated on the tire product after vulcanization can be prevented. It can be greatly reduced. Further, the improvement in durability also leads to maintenance and stabilization of molding accuracy, which is also excellent in mold maintainability.

EXAMPLES AND COMPARATIVE EXAMPLES Tires were continuously vulcanized using the mold of the present invention in which the split positions were arranged as shown in FIG. Further, as a comparative example, continuous vulcanization of the tire was performed using a mold whose split position was arranged as shown in FIG. Continuous vulcanization was performed using a new mold, the number of vulcanizations until the first occurrence of rubber delamination on the tire, and the first rubber delamination occurred. When vulcanization was carried out, the number of vulcanizations until the next occurrence of rubber delamination was as shown in Table 1. The tires used were 175 / 70R13 82Q in size.

[0011]

[Table 1]

[0012]

According to the present invention, it is possible to prevent the rubber from sticking out on the outer appearance of the tire. Furthermore, distortion and damage of the mold are prevented, and the life and durability of the mold are significantly improved. Further, it also has an excellent effect on mold maintainability.

[Brief description of drawings]

FIG. 1 is an explanatory view illustrating a correspondence between a mold of the present invention and a tire surface.

FIG. 2 is an explanatory diagram illustrating a correspondence between a conventional mold and a tire surface.

[Explanation of symbols]

 1 mold 2 tire 3 circumferential groove 4 radial groove 6 circumferential split position 7 circumferential split position 8 radial split position 11 siping

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area B29K 105: 24 B29L 30:00

Claims (2)

[Claims] 1. A mold used for vulcanizing and manufacturing a tire, the mold comprising a plurality of molds, which is located at a buttress portion of the tire among split positions in a direction along the outer periphery of the tire. Is formed at a position corresponding to the side surface portion other than the decoupling groove extending in the direction, and the one located in the tread crown portion is formed at a position that does not overlap with the groove extending in the tire outer circumferential direction. A mold for tire vulcanization, characterized in that the position is formed so as not to overlap a groove extending in the tire width direction. 2. A mold used for vulcanizing and manufacturing a tire having sipings in a tire pattern, the mold comprising a plurality of molds. Those located in the buttress portion are formed at positions corresponding to side surfaces other than the decoupling groove that extends in the circumferential direction, and those located in the tread crown portion are formed at positions that do not overlap with the groove extending in the tire outer circumferential direction. The split position in the width direction of the tire is formed at a position that does not overlap with the groove extending in the tire width direction, and 1.5 m from the end of the knife blade.
A tire vulcanizing mold characterized in that a split position is formed at a position separated by m or more.