JP2000108129A - Tire vulcanizing mold and tire vulcanizing molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To contrive to save the space of the storage place of core segments under the conditions not being used for manufacturing a tire and to reduce the production cost of segments in response to a size. SOLUTION: This vulcanizing mold is equipped with a rigid outer mold having a molding surface for forming the outside shape and a rigid inner mold 3 with a toroidal member 2 having a molding surface 1 for forming the inner surface shape of the tire. In addition, the toroidal member 2 of the inner mold 3 consists of a large number of core segments 5a and 5b movably and radically inward and out. The respective core segments 5a and 5b composing the toroidal member 2 of the inner mold 3 consists of a base core member 6, which is common irrespective of the size of the outer mold, and a changing-over core member 7, which can detachably connect to the base core member 6 and fits to every size and is used exclusively.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rigid outer mold having a molding surface for forming an outer shape of a tire and a rigid body having a toroidal member having a molding surface for forming an inner shape of the tire. The present invention relates to a tire vulcanization molding die having an inner mold and a tire vulcanization molding method using the same, and more specifically, a core segment constituting a toroidal member of an inner mold is reduced to an outer mold size. By using a member that can be shared independently of each other and a dedicated member that fits the size of each outer die, it is possible to save space for the storage space of members that constitute the inner die that does not fit the size of the green tire to be vulcanized and molded. ,
It is intended to reduce the manufacturing cost in the case of manufacturing a member constituting an inner die adapted to each size.

[0002]

2. Description of the Related Art Conventional vulcanization molding dies include a rigid outer mold having a molding surface for forming an outer shape of a tire, such as a tread ring for forming a tread portion of a tire, and a tire for a tire. A rigid body having an outer mold composed of both side mold members for forming side portions and a toroidal member having a molding surface for forming an inner surface shape of the tire as shown in FIGS. 7 and 8. There is a mold provided with an inner mold for performing so-called core vulcanization molding, and such a mold is described, for example, in Japanese Patent Publication No. Hei 6-28863.

In the case of vulcanizing and molding a tire using the mold described in the above-mentioned publication, a carcass layer is formed by knitting a rubberized cord around the outer periphery of the toroidal member 101 of the inner mold. A green tire is manufactured by winding a rubberized cord spirally around the outer periphery of the carcass layer to form a belt layer, and further winding a belt-like raw rubber (tread rubber) around the outer periphery of the carcass layer and the belt layer. This is performed by inserting the inner mold with the raw tires directly into the outer mold and closing the outer mold.

[0004] Since the toroidal member 101 of the inner mold constituting such a mold is made of a rigid body such as an aluminum casting, in consideration of the mold removal from the tire after vulcanization molding, as shown in FIG. Many divided core segments 102a, 102b
And some of its core segments
Both ends of 102a are provided with draft angles.

[0005] Further, the core segments 102a and 102b
As shown in FIG. 8, there are a case where a hollow cross-sectional shape is taken in consideration of steam heating or the like at the time of vulcanization molding, and a case where a solid cross-sectional shape is used as shown in FIG. Generally, they are formed integrally.

[0006] As described above, in the conventional mold, the core segment is formed of a single body. Therefore, when tires of different sizes are manufactured using such a mold, the tires are accordingly required.
Since the inner surface shape of the tire is different, the core segment cannot be used, and when vulcanizing and molding tires of different sizes, the core segments have to be totally replaced. However, the conventional method of totally replacing a single core segment every time tires of different sizes are manufactured has a problem that a considerably large space is required for storing the core segments.

[0007] Therefore, the present inventors have conducted intensive studies in order to solve such problems, and have obtained the following findings. That is, if the core segment is not composed of a single body but composed of a composite of a member that can be shared regardless of the outer mold size and a dedicated member that is adapted only to each outer mold size, different sizes of the core segment can be obtained. Even in the case of manufacturing a tire, the common member does not need to be newly manufactured for each of the sizes, and as a result, the core segment when not used for manufacturing the tire is made up of only the dedicated members among them. As a result, they found that the storage space could be saved. Further, it has been found that if the core segment is formed of the above-described composite, the core segment according to the size can be manufactured only by the dedicated member constituting the core segment, and as a result, the manufacturing cost can be reduced.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a tire manufacturing method by constructing a composite of a member that can be shared regardless of the outer die size and a dedicated member that is adapted only to each outer die size. Tire vulcanization mold and tire vulcanization molding using the same, which can save the space for storing the core segment when not being used and reduce the production cost of the core segment according to the size It is to provide a method.

[0009]

In order to achieve the above object, a vulcanization mold according to the present invention comprises a rigid outer mold having a molding surface for forming an outer surface shape of a tire, and a tire inner surface shape. A toroidal member having a toroidal member having a molding surface for forming, wherein the toroidal member of the inner die comprises a number of core segments movable in and out of its radial direction, Each core segment constituting the member was composed of a composite of a base core member that can be shared regardless of the size of the outer mold and a dedicated switching core member that is detachably connected to the base core member and adapted to the size. Things.

Preferably, the core member is made of an iron-based material, and the switching core member is made of an aluminum-based material.

Further, it is preferable that both end faces of the base core member and the both end faces of the switching core member constituting the segment are in the same plane.

Further, the vulcanization molding method of the present invention is a method of vulcanizing a green tire using the above-mentioned mold, and when the outer mold size is changed according to the tire size, the inner mold toroidal member is used. In each of the core segments, first, the switching core member used before the change is removed from the base core member, and then, the switching core member adapted to the changed outer die size is connected to the base core member. It is to reconfigure by.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a typical sectional view of a toroidal member constituting an inner mold of a vulcanization mold according to the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is an inner mold having the toroidal member of FIG. 2 is a cross-sectional view in the width direction of FIG.
Is a molding surface, 2 is a toroidal member, 3 is an inner mold, 4 is a radial direction of the toroidal member, 5a and 5b are core segments, 6 is a base core member, and 7 is a switching core member.

The vulcanization mold of the present invention comprises a rigid outer mold (not shown) having a molding surface for forming the outer shape of the tire and a molding surface 1 for forming the inner shape of the tire. And a rigid inner mold 3 having a toroidal member 2 having the same.

The toroidal member 2 of the inner mold 3 is composed of a large number of core segments 5a and 5b that can move in and out in the radial direction 4.

Since the inner mold 3 needs to be configured to be removable from the vulcanized tire after vulcanization molding, a part of the core segments 5a and 5b of the core segments 5a and 5b constituting the toroidal member 2 is required. About its end faces 5a ₁ ,
It is preferable to provide, for example, a draft so that 5a ₂ can be moved radially inward.

In FIG. 2, as an example, both end faces 5a ₁ , 5a
and five core segments 5a imparted with draft to a _2,
A case is shown in which the toroidal member 2 is formed by alternately arranging five core segments 5b having corresponding end surfaces 5b ₁ and 5b ₂ along the circumferential direction 9, but in the present invention, The types of the core segments and the number of the core segments, the size of the draft applied to the end face, and the like can be appropriately changed according to the size of the mold.

The main feature of the configuration of the vulcanization mold of the present invention is that each core segment 5a, 5b constituting the toroidal member 2 of the inner mold 3 can be shared regardless of the size of the outer mold. The core member 6 and a dedicated switching core member 7 detachably connected to the core member 6 and adapted to the above-mentioned size are constituted.

By adopting this configuration,
Even when the size of the outer die is changed, the inner die 3 needs only to be replaced with the switching core member 7 and the base core member 6
Since the core segment of the inner mold 3 that cannot be used for vulcanization molding because of its different size can be used even after the change, the base core member can be used, so the storage space is a space where only the switching core member 7 can be stored. Is enough to save space. In addition,
Since the base core member 6 can be shared irrespective of the outer mold size, cost reduction can be achieved.

The base core member 6 is preferably made of an iron-based material which is excellent in durability and strength and advantageous in terms of material cost, since it is used repeatedly and repeatedly, but is not limited thereto. , And relatively expensive materials such as alloy materials such as titanium and magnesium.

Although the base core member 6 has a U-shaped cross section in FIG. 1, other shapes may be used.

The switching core member 7 is preferably made of an aluminum-based material having excellent workability, light weight, and thermal conductivity.

The switching core member 7 is a solid switching core member in FIG. 3, but is not limited to this.
As shown in FIG. 6, if a hollow member is used, the thickness of the switching core member 7 can be reduced, so that the heat conductivity is improved and the heating efficiency from the inside of the tire can be increased.

As means for detachably connecting the switching core member 7 to the base core member 6, for example, as shown in FIG. 1, it is preferable to use a fastening bolt 8, but the present invention is not limited to this. Fastening means may be used.

When the switching core member 7 is solid, the fastening bolt 8 is positioned radially outside the base core member 6 (FIG. 3).
In addition, when the switching core member 7 is hollow, it is preferable that the switching core member 7 be disposed at least at one side position (FIG. 6) of both ends of the base core member 6.

Further, one core segment 5a or 5b is formed.
Both end surfaces 6a of the base core member 6 to be formed ₁, 6a_TwoOr 6b₁, 6b_Two
And both end surfaces 7a of the switching core member 7.₁, 7a_TwoOr 7b₁, 7b_TwoIs
Make sure each end face is in the same plane
For example, the core segment diameter when removing the inner mold from the tire
The movement inward in the direction can be performed smoothly.

In consideration of the removal of the inner mold 3 from the tire, the allowable range of the size that can share the base core member 6 is limited, but if the size exceeds the allowable range, the number of divided core segments is It is apparent from the geometric calculation that the allowable range of the size in which the base core member 6 can be shared is further widened by increasing the number.

FIGS. 4 (a) and 4 (b) show an inner mold toroidal member 2A used for vulcanizing and molding a small-sized tire, respectively, and FIGS. An example of a cross section of the toroidal member 2B to be used is shown. From these figures, the base core member 6 can be used in any size regardless of the size, and only the switching core member has different dimensions and shapes. Stuff 7
It can be seen that by using A and 7B, respectively, toroidal members that fit various sizes can be constructed.

FIG. 3 shows an example of an inner mold 3 formed by using the toroidal member 2 shown in FIG.
The inner die 3 shown in FIG. 3 includes the toroidal member 2, a cylindrical sleeve 10 disposed at a position maintaining the coaxial relationship inside the radial direction 4, and both-side ring members 11 for detachably fastening these members. , 12 mainly.

The cylindrical sleeve 10 has a flange 13 formed on the outer periphery of one end in the axial direction.

The ring member 11 on one side is
And is rotatably supported at one axial end of the sleeve 10. This ring member 11
Is fixed on the outer peripheral surface of the sleeve 10 by being gripped from both sides by the flange 13 and the retaining ring 14 attached to the outer periphery of the sleeve 10. An outer flange 16 having an annular projection 15 is formed at one axial end of the ring member 11. The ring member 11 engages with the flange 17 provided at the radially inner end of the base core member 6 constituting the core segments 5a, 5b so that the annular projections 15 form the core segments 5a, 5b.
Is connected to one radial inner end.

Sleeve 10 and ring member 11 on one side
Constitutes a substantially cylindrical main fastening body 18 whose one axial end is connected to a radially inner end of one side of the toroidal member 2 as a whole, and the sleeve 10 of the main fastening body 18 has a toroidal shape. The member 2 is inserted into the center space from one side while maintaining the coaxial relationship.

On the other hand, the ring member 12 on the other side has a role of a sub-fastening body, so that an outer flange 20 having an annular projection 19 is formed at the other end in the axial direction.
A female screw portion 21 is formed on the inner peripheral surface.

The female screw portion 21 formed on the ring member 12 is screw-connected to the male screw portion 22 formed on the outer periphery of the other end of the sleeve 10 in the axial direction. 18 (more specifically, the sleeve 10). When the ring member 12 on the other side is thus fastened to the main fastening body 18, the annular projection 19 of the ring member 12 on the other side engages with the flange 17 of the base core member 6, whereby the other side Ring member 12 is connected to a radially inner end on the other side of toroidal member 2.

As described above, the inner mold 3 is formed by connecting and combining the toroidal member 2, the main fastening member 18 composed of the sleeve 10 and the one-side ring member 11, and the other-side ring member 12. However, the present invention is not limited to this configuration.

Next, an example of a method of removing the inner mold 3 from the vulcanized tire after vulcanization molding will be described. As a method of removing the inner mold 3 from the tire, after removing the other side ring member 12 and the main fastening member 18 from the toroidal member 2 in a procedure opposite to the above-described method of forming the inner mold, FIG. As shown in FIG. 5, first, five core segments 5a having both end faces 5a ₁ and 5a ₂ with draft angles are moved radially inward and are sequentially extracted, and then, as shown in FIG. (5 in FIG. 5 (b)) It is preferable to carry out by sequentially extracting the core segments 5b.

Finally, a method for vulcanizing a green tire using the above-described mold will be described. The vulcanization molding method of the present invention,
As a general rule, the vulcanization is performed according to the conventional method of core vulcanization.However, the difference from the conventional method is that when the outer die size is changed according to the tire size, the inner die is vulcanized to form tires of different sizes. Each core segment 5a or 5b constituting the toroidal member 2 of No. 3 is first detached from the base core member 6 by switching the switching core member used before the change.
Then, by connecting another switching core member adapted to the changed outer die size to the base core member 6,
This is to reconfigure the core segments 5a and 5b.

The above is only an example of the embodiment of the present invention, and various changes can be made within the scope of the claims.

[0039]

According to the present invention, even when the size of the outer die is changed, the inner die can be used only after replacing the switching core member, and the base core member can be used after the change. The storage space for core segments that do not fit the size of the core segment is sufficient as long as there is enough space to store the switching core member, saving space and sharing the base core member regardless of the outer die size As a result, manufacturing costs can be reduced accordingly.

[Brief description of the drawings]

FIG. 1 is a sectional view of a toroidal member constituting an inner mold of a vulcanization mold according to the present invention.

FIG. 2 is a plan view of the toroidal member shown in FIG.

FIG. 3 is a sectional view of an inner mold formed by combining the toroidal member shown in FIG. 1 with a main fastening body and the other-side ring member.

4 (a) is a cross-sectional view of a toroidal member adapted to a small-sized outer die, and FIG. 4 (b) is a cross-sectional view of a toroidal member adapted to a large-sized outer die.

FIGS. 5A and 5B are diagrams for explaining a method of removing an inner mold from a vulcanized tire after vulcanization molding.

6 is a cross-sectional view of the inner die shown in FIG. 3 when a switching core member is hollow.

FIG. 7 is a plan view of a toroidal member constituting an inner mold used for a conventional vulcanization mold.

FIG. 8 is a sectional view of the toroidal member shown in FIG. 7;

FIG. 9 is a sectional view of a conventional toroidal member.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molding surface 2 Toroidal member 3 Inner die 4 Radial direction of toroidal member 5a, 5b Core segment 6 Base core member 7 Switching core member 8 Fastening bolt 9 Peripheral direction of toroidal member 2 10 Sleeve 11 Ring member 12 Ring member 13 Flange of the sleeve 10 14 Stop ring 15 Annular projection of the ring member 11 16 Outer flange of the ring member 17 Flange of the base core member 6 18 Main fastening body 19 Annular projection of the ring member 12 20 Outer flange 21 of the ring member 12 Ring Female thread of member 12 Male thread of sleeve 10 Toroidal member 102a, 102b Core segment

Claims (4)

[Claims] 1. A rigid outer mold having a molding surface for forming an outer surface shape of a tire, and a rigid inner mold having a toroidal member having a molding surface for forming an inner surface shape of the tire, The toroidal member of the inner mold is a tire vulcanization mold composed of a large number of core segments movable in and out in the radial direction, wherein each core segment constituting the toroidal member of the inner mold is
A tire vulcanization molding comprising a composite of a base core member that can be shared regardless of the size of an outer mold and a dedicated switching core member detachably connected to the base core member and adapted to each size. Mold. 2. The tire vulcanization mold according to claim 1, wherein the base core member is made of an iron-based material, and the switching core member is made of an aluminum-based material. 3. An end face of a base core member and an end face of a switching core member constituting one core segment, each end face being in the same plane.
Or the tire vulcanization mold according to 2. 4. A method for vulcanizing a green tire using the mold according to any one of claims 1 to 3, wherein when changing the outer mold size according to the tire size, the inner mold toroid. For each core segment that constitutes the shape member, first remove the switching core member used before the change from the base core member, and then connect the switching core member that fits the changed outer die size to this base core member A tire vulcanization molding method, wherein the tire is reconstituted.