JPH06106540A - Metal mold for tire-vulcanization molding - Google Patents

Abstract

PURPOSE:To provide a metal mold for tire-vulcanization molding wherein no spew is generated on a surface of a tire. CONSTITUTION:A metal mold for tire-vulcanization molding consists of a plurality of parts 2 arranged with a micro spacing peripherally, a holder 1 holding a plurality of those parts 2, and a side plate 4 which abuts against the holder 1 and holds its side face. A part 1a in contact with the side plate 4 of a front face of the holder 1 is inclined near to a tire center from a state normal to an advance direction of the holder 1, and upper and lower faces of the holder is so constructed as to be capable of sticking fast to the upper and lower side plates 4, 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for tire vulcanization molding, and more specifically, during the tire vulcanization process, raw rubber and air and gas enclosed in the mold are pressurized and heated to the outside. The present invention relates to a tire vulcanization molding die having a gap to be discharged to the inside.

[0002]

2. Description of the Related Art Conventionally, a tire vulcanization molding die has a sector 3 in which a plurality of parts 2 are housed in a holder 1, and a holder of the sector 3, as shown in a sectional explanatory view of FIG. 1 and the side plates 4 contacting the front surfaces of both ends. The gap S between the plurality of parts 2 is for discharging unnecessary gas to the outside during vulcanization.
The surfaces of the contact portions 1A on both front surfaces of the holder 1 where the holder 1 contacts the side plates 4 and the contact portions 4A on the side of the side plate 4 are conventionally the traveling direction when a force P is applied to the holder 1. It was formed to be at a right angle.

[0003]

When a force P is applied to the holder 1 in the arrow direction during vulcanization, the holder 1
Causes a phenomenon of warping, and the contact portions 1 at both ends of the holder 1
A.1A will be deformed so as to slide and spread on the surfaces of the upper and lower side plate side contact portions 4A and 4A. Due to the deformation of the holder 1, the gaps S between the plurality of parts 2 in the holder 1 become wider. The widening of the gap S causes the raw rubber to enter the gap S from the tire side together with air and gas due to the pressure during vulcanization, so that unnecessary spews are generated on the tire surface T and the post-treatment is performed. There was a problem that not only it became complicated, but also the beauty was impaired. The present invention aims to solve such problems.

[0004]

In order to achieve the above object, the present invention provides the following mold for tire vulcanization molding. That is, the present invention is a tire vulcanization molding die having slits for allowing air and gas to pass therethrough in the circumferential direction and discharging to the outside, and a plurality of parts 2 arranged with a minute gap S, A holder 1 that holds the plurality of parts 2 from the circumferential direction so as to wrap the parts 2 and a side plate 4 that contacts the holder 1 and holds the side surface thereof. A contact portion 1a with the side plate 4 on the front surface of the holder 1 is A mold for tire vulcanization molding, which is inclined toward the center of the tire from a state perpendicular to the traveling direction of the holder 1.
And a plurality of plates 2 for vulcanizing and molding a tire having slits for allowing air and gas to pass through in the circumferential direction and discharging the air to the outside, the plates being provided with a minute gap S.
And a holder 1 which holds the plurality of plates 2 from the circumferential direction so as to wrap the plate 2 and a side plate 4 which contacts the holder 1 and holds a side surface, and a contact portion 1a with the side plate 4 on the front surface of the holder 1 is A metal for tire vulcanization molding, characterized in that the holder 1 is inclined toward the center of the tire from a state perpendicular to the traveling direction, and the upper and lower surfaces of the holder 1 and the upper and lower side plates 4 and 4 can be closely attached to each other. Type. Is.

[0005]

In the above structure, when the holder receives a force of P, the contact surfaces of the side plates are inclined toward the center of the tire, so that the front surfaces of both ends of the holder receive a component force in the closing direction. Therefore, when the front surfaces of both ends of the holder act in the closing direction, the gap S between the plurality of plates 2 does not widen,
It has the function of preventing spews. Further, the upper and lower abutting portions of the holder 1 are pressed by the upper and lower side plate horizontal abutting portions during vulcanization to be in a close contact state. for that reason,
The gap S does not widen and acts to prevent spews.

[0006]

Embodiments of the present invention will now be described with reference to the drawings, showing how the construction of the present invention is actually embodied, together with its operation. FIG. 1 is a cross-sectional explanatory view of an embodiment of the invention of claim 1, in which 1 is a metallic holder in which a plurality of metallic tires are divided in the circumferential direction. The parts 2 are accommodated with a minute gap S in the circumferential direction. The holder 1 and the plurality of parts 2 form a sector 3. Side plates 4 are symmetrically placed on both upper and lower surfaces of the holder 1.
Tire vulcanization molding is performed on the inside surrounded by the sector 3 including the holder 1 and the plurality of parts 2 and the upper and lower side plates 4 and 4 under pressure and heating. The angle of the upper and lower front surfaces of the holder 1 is different from the conventional vertical one, and is inclined toward the center of the tire to form inclined contact portions 1a, 1a that contact the side plate.
The contact portions 4a and 4a of the side plates 4 and 4 of the holder 1 which are in contact with the inclined contact portions 1a and 1a are also
Of course, similarly, it is inclined toward the center of the tire. The reason why the inclined contact portions 1a, 1a and the corresponding inclined contact portions 4a, 4a are inclined toward the center of the tire is that when a force P is applied to the holder 1, This is to prevent the phenomenon that each gap S between the parts 2 widens.

That is, the force P applied to the holder 1
In the upper and lower two inclined contact portions 1a and 1a,
It is divided into P / 2 and P / 2, each half in the traveling direction. Regarding the force in the traveling direction of P / 2 on the one hand,
When disassembled in a direction parallel to the direction perpendicular to the surface of the contact portion, the component force in the direction perpendicular to the abutment part is (P / 2) cos α, and the component force in the parallel direction is (P / 2) sin α. Here, it is important that the direction of the component force represented by (P / 2) sin α is a force acting in the direction of closing the front surfaces of both ends of the holder 1. Then, the two inclined contact portions 1
Since a and 1a are on both the upper and lower sides of the front surface of the holder 1 and the upper and lower sides in the figure work in symmetrical directions, two component forces (P / P
2) sinα and (P / 2) sinα are added together as forces to close each other, resulting in Psinα. in this way,
In the holder 1, the surfaces of the front abutting portions 1a and 1a are inclined toward the tire center, and the abutting portions 4a and 4a of the upper and lower side plates 4 and 4 are also inclined in a corresponding manner. When force P is applied to the holder 1 from the outside during the vulcanization,
The component of the force P acts in the direction in which the front surface of the holder 1 is closed. Therefore, in the plurality of parts 2 held so as to be wrapped in the holder 1, the mutual gap S does not expand, and therefore, the plurality of gaps S are
Air is discharged at the time of vulcanization, but rubber is not passed through, and spews are not generated on the tire surface.

FIG. 2 is a sketch of the sector 3 of this embodiment. There is a circumferential gap between the part 2 and the holder 1 even when the part 2 is divided in the tire radial direction, and when a force P is applied to the holder 1, the inclined contact portion 1a, 1a and corresponding inclined contact portions 4a, 4a
Is inclined toward the center of the tire, so that it is possible to prevent the circumferential gap from widening. This sketch is also applied to the invention of claim 2 below.

FIG. 3 shows an embodiment of the invention of claim 2. In this embodiment, in addition to the inclined structure of the front surface of the holder of the above embodiment, the upper and lower contact portions 1b and 1b of the holder 1 are also provided.
Is characterized in that the upper and lower side plate horizontal abutting portions 4b and 4b are pressed during vulcanization to be in a close contact state. Since the holder 1 is brought into the close contact state, even if the holder 1 is pushed in the traveling direction by the force P, the upper and lower contact portions 1b and 1b are connected to the horizontal contact portions 4 of both side plates 4 and 4.
Since it is pressed by b4b and does not open, the gap S between the plurality of internal parts 2 does not open, and therefore spews are further prevented from occurring. As described above with reference to the embodiments, the present invention is a tire vulcanization molding die having a slit for passing air and gas in the circumferential direction and discharging the air to the outside, and is provided with a minute gap S. Multiple parts 2
And a holder 1 for holding the plurality of parts 2 in the circumferential direction so as to wrap the plurality of parts 2 and a side plate 4 for holding the side surface of the holder 1 in contact with the side plate 4 on the front surface of the holder 1. Is characterized in that it is inclined toward the center of the tire from a state perpendicular to the traveling direction of the holder 1, and therefore, the holder 1 is vulcanized during tire vulcanization.
When a force P is applied from the outside, the component force in the direction along the inclined surface acts in the direction of closing the holder 1, and therefore,
Even if a force P is applied to the holder 1, the gap S between the plurality of parts 2 held by the holder 1 is not likely to widen, and spews can be prevented from occurring. In addition to the above-mentioned structure, the horizontal contact portions 4b of the upper and lower side plates 4
4b and the upper and lower abutting portions 1b and 1b of the holder 1 are configured to be in close contact with each other with no gap during tire vulcanization,
Since the holder 1 is pressed up and down, the gap S between the plurality of parts 2 is not likely to widen, and the effect of preventing spews is further enhanced.

[0010]

As described above, according to the present invention, the tire vulcanizing mold has a plurality of parts arranged with minute gaps, a holder for enclosing the plurality of parts in the circumferential direction, and the holder. And a side plate that holds the side surface of the holder, and the contact portion of the front surface of the holder with the side plate is inclined toward the tire center from a state perpendicular to the traveling direction of the holder. When a force P is applied to the
The component force in the direction along the inclined surface acts in the direction of closing the holder. Therefore, even if the force P is applied to the holder, the gap between the plurality of parts held by the holder is not likely to widen, and spew is generated. It can be prevented. Further, in addition to the above effects, the invention of claim 2 is configured such that the horizontal abutting portions of the upper and lower side plates and the upper and lower abutting portions of the holder can be adhered to each other without a gap during tire vulcanization. Because there is
The upper and lower sides of the holder are directly pressed by the side plates, so that the gap between the plurality of plates is not more surely widened, and the effect of preventing the spew is further enhanced. And so on.

[Brief description of drawings]

FIG. 1 is a sectional explanatory view of an embodiment of the invention of claim 1;

FIG. 2 is a sector sketch of the embodiment.

FIG. 3 is a sectional explanatory view of an embodiment of the invention of claim 2;

FIG. 4 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1 Holder 1a 1 Inclined contact part 1b Vertical contact part 1b 1 2 Parts 4 Side plate 4a 4 contact part 4b 4 Horizontal contact part

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B29L 30:00 4F

Claims (2)

[Claims] 1. A tire vulcanization molding die having a slit for allowing air and gas to pass therethrough in the circumferential direction to be discharged to the outside, and a plurality of parts arranged with a minute gap, and a plurality of these parts. A holder for holding the parts, and a side plate for contacting the holder and holding the side surface, the contact portion with the side plate on the front surface of the holder,
A tire vulcanization molding die, which is inclined toward a tire center from a state perpendicular to the holder traveling direction. 2. A tire vulcanization molding die having a slit for passing air in the circumferential direction and discharging the air to the outside,
A plurality of parts arranged with a minute gap S, a holder for holding the plurality of parts, and a side plate for abutting the holder and holding a side surface of the holder. Is a tire vulcanization molding die characterized in that the holder is inclined toward the center of the tire from a state perpendicular to the traveling direction of the holder, and the upper and lower side plates and the upper and lower side plates can be brought into close contact with each other.