JP3237977U - Tire vulcanization mold equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of repairs and extend the life by preventing damage and wear of a segment, improve the assembly accuracy of an annular mold, prevent damage to a tire as a product, and promptly. The challenge is to provide a tire vulcanization die device that can improve productivity by moving. SOLUTION: When pushing each segment 7 by an external ring 4, the external ring side guide flat surface 42 faces the segment side guide flat surface 72 from the open position to the intermediate position before reaching the closed position of each segment 7. It abuts and pushes, and from the intermediate position to the closing position of each segment 7, the outer ring-side sword-shaped inner side surface 41 directly abuts and pushes each segment-side sword-shaped outer surface 71. The lengths N and L of the segment side guide flat surface 72 and the outer ring side guide flat surface 42 in the circumferential direction are 40% to 60% of the length M in the circumferential direction of the outer surface of each segment 7. It is a tire sulfurizing mold device configured in%. [Selection diagram] Fig. 5

Description

The present invention relates to a tire vulcanizing die device, and more particularly to a tire vulcanizing die device for vulcanizing automobile tires and the like.

Conventionally, as a mold device for molding an automobile tire, a mold device called a tire vulcanization mold for molding while vulcanizing a tire has been provided. The tire vulcanization mold device is provided with an annular mold for forming the tread portion of the tire.
In recent years, as an annular mold for forming a tread portion of this tire, a mold having an annular split mold formed by dividing the annular mold into a plurality of portions in the circumferential direction is often used. Each of these split dies is called a segment, and as a tire vulcanization die provided with an annular die composed of such a plurality of segments, for example, Patent Document 1 below is provided.

Japanese Unexamined Patent Publication No. 60-78711

The above-mentioned Patent Document 1 is a device relating to a tire vulcanizer provided with an annular mold composed of a plurality of segments. In this tire vulcanizer, since the wall thickness in the radial direction of the segment can be reduced, there is an advantage that the external dimensions of the vulcanizable tire can be increased.
In the conventional tire vulcanization die as shown in the above-mentioned practical novel registration document 1, as shown in FIG. 10, the inside of the outer ring 21 located on the outer side in the radial direction of each segment 22 has a conical surface 21a. At the same time, the outer side of each segment 22 is a vulcanized conical surface 22a, and the outer ring 21 is moved from the upper side to the lower side to move each segment 22 from the outer side to the inner side in the radial direction and close the annular mold. However, the structure is such that the annular mold is assembled by this. When the annular mold is closed and assembled, the inner conical surface 21a of the outer ring 21 is in close contact with the outer conical surface 22a of each segment 22.
On the other hand, after the completion of vulcanization molding, the outer ring 21 is moved from the lower side to the upper side to move each segment 22 from the inner side to the outer side in the radial direction to open the annular mold. Specifically, by loosely fitting the T-shaped block 21b on the outer ring 21 side into the T-shaped groove 22b on the side of each segment 22, the T-shaped block 21b becomes the T-shaped groove 22b due to the rise of the outer ring 21. In the hooked state, each segment 22 is moved outward in the radial direction (in the direction of the white arrow shown in FIG. 10B) to open the annular mold.
However, as shown in FIG. 10A, in the conventional tire external vulture mold device, the entire area in the process of moving the ring from the upper side to the lower side, that is, the outer ring 21 completely closes each segment 22. In the entire area before reaching the lower position, the radius of curvature of the arc of the head conical surface 21a of the outer ring 21 that is in contact with each other is larger than the radius of curvature of the arc of the head conical surface 22a of each segment 22. , Each segment 22 makes a very local contact with the outer ring 21 as a line contact. For this reason, each segment 22 becomes extremely unstable during movement and repeats local contact and contact with the external ring 21, so that the segments are easily worn or damaged, and the dimensional accuracy is deteriorated. There was a problem of inviting. Further, there is a problem that the posture of each segment 22 collapses and smooth operation cannot be obtained, and there is a problem that it is difficult to obtain good assembly accuracy of the annular mold.
Further, as shown in FIG. 10B, after the completion of vulcanization molding, each segment 22 is in close contact with the uneven pattern (not shown) of the tread portion of the tire 30 to be a product, so that the annular mold is formed. The load at the time of opening does not become a uniform load for each segment. For this reason, each segment 22 becomes extremely unstable even during movement when the annular mold is opened, and when the movement of the segment 22 is particularly large, local contact with the T-shaped block 21b ( For example, a contact portion U surrounded by a broken line in FIG. 10 (b) and a bite into the tire 30 (for example, a portion indicated by a bite portion T surrounded by a broken line in FIG. 10 (b)) occur, and the end face of the segment 22 occurs. There was a problem that the portion and the tire 30 were damaged. Further, there is a problem that the end portion of the divided surface of the segment 22 is easily damaged because the end portion of the segment 22 bites into the tire 30.

Therefore, the present invention solves the above-mentioned problems of the prior art, can reduce the number of repairs and extend the life by preventing damage and wear of the segments of the annular mold, and can also extend the life of the annular mold, and the annular metal assembled by closing each segment. It is possible to improve the accuracy and stability of mold assembly (mold assembly), prevent damage to the tires that are the products, stabilize the posture during the movement of the segment, and be productive by swift movement. The challenge is to provide a tire vulcanization die device that can improve the tire vulcanization.

The tire vulcanization die apparatus of the present invention includes a plurality of segments constituting an annular split die for forming a tread portion of a tire, and an external ring arranged radially outward of the plurality of segments. By moving the outer ring in one direction in the axial direction, the outer ring pushes each segment inward in the radial direction to close the annular split mold, and the outer ring is moved in the opposite direction to the one direction in the axial direction. A tire vulcanization die device configured to open an annular split die by moving each segment outward in the radial direction by moving in the direction.
The outer surface of each of the segments and the inner surface of the outer ring facing the outer surface are formed into a segment-side conical outer surface and an outer ring-side conical inner surface facing each other.
A part of the outer surface of the side cone of each segment and a part of the inner side surface of the cone of the outer ring form a segment side guide flat surface and an outer ring side guide flat surface facing each other. The length of the segment-side guide flat surface and the external ring-side guide flat surface in the circumferential direction is within the range of 40% to 60% of the circumferential length of the outer surface of each segment. It is configured in
In addition, the push of each segment by the external ring is such that the outer ring side guide flat surface comes into surface contact with the segment side guide flat surface and pushes from the open position to the intermediate position before reaching the closing position of each segment. From the intermediate position to the closing position of each segment, the outer ring-side guide flat surface and the segment-side guide flat surface are replaced with the outer ring-side guide flat inner surface. The first feature is that the surface is directly in contact with the outer surface of the conical outer surface on the side of each segment and pushed.

Further, in the tire vulcanization mold device of the present invention, in addition to the above-mentioned first feature, from the contact between the outer ring side guide flat surface and each segment side guide flat surface, the outer ring side side conical inner side surface and each The second feature is that the intermediate position instead of the contact with the segment-side vulcanized outer surface is configured to be adjustable.

Further, in the tire sulfurizing mold apparatus of the present invention, in addition to the above-mentioned first or second feature, the segment-side guide flat surface formed as a part of the segment-side side conical outer surface is the guide flat surface thereof. Is configured to be placed at a receding position recessed from the arc locus of the convex curved surface constituting the segment-side conical outer surface, and is configured as a part of the outer ring-side conical inner surface. The outer ring-side guide flat surface is configured such that the guide flat surface is arranged at an advance position that is advanced from the arc locus of the concave conical curved surface constituting the outer ring-side radial inner surface. It is the feature of 3.

Further, in the tire vulcanization mold apparatus of the present invention, in addition to any one of the above-mentioned first to third features, one or both of the segment side guide flat surface and the external ring side guide flat surface can be attached and detached. The fourth feature is that it is composed of a metal plate.
Further, in addition to the above-mentioned fourth feature, the tire vulcanization die of the present invention has a fifth feature that the thickness of the metal plate can be adjusted by cutting or polymerization.
Further, in the tire vulcanization die apparatus of the present invention, in addition to the above-mentioned fourth feature, the metal plate is made of a copper alloy, a surface-treated iron alloy such as a soft nitriding treatment, or other materials suitable for sliding. Is the sixth feature.

According to the tire vulcanization mold apparatus according to claim 1, a part of the outer surface of the side cone of each segment and a part of the inner side surface of the cone of the outer ring side face each other on the segment side. Since the guide flat surface and the external ring side guide flat surface are configured,
The pushing force of each segment by the external ring can be performed by bringing the external ring-side guide flat surface into contact with the segment-side guide flat surface. Therefore, each segment is stably pushed with respect to the external ring in a surface contact state, and the posture does not wobble. Therefore, it is possible to sufficiently reduce the damage and wear of the segment due to unnecessary contact and contact with the external ring, and it is possible to reduce the number of repairs and extend the service life.
In addition, the push of each segment by the external ring can be performed by bringing the external ring-side guide flat surface into contact with the segment-side guide flat surface, thus preventing the posture of the segment from wobbling while the external ring is moving. Therefore, the movement of the external ring can be made faster, and the push of the segment can be made faster. Therefore, it is also possible to shorten the time required for assembling the annular mold (mold assembly) and improve the productivity.
In addition, the push of each segment by the external ring is such that the outer ring side guide flat surface comes into surface contact with the segment side guide flat surface and pushes from the open position to the intermediate position before reaching the closing position of each segment. From the intermediate position to the closing position of each segment, the outer ring-side guide flat surface and the segment-side guide flat surface are replaced with the outer ring-side guide flat inner surface. Is configured to directly contact the outer surface of the conical outer surface on each segment side and push it.
From the middle position to the closing position, the inner surface of the outer ring-side conical cone directly contacts the outer surface of each segment-side conical cone while pushing each segment. There is some play in the movement of the, so that the mutual positional relationship between each segment and the external ring is definitely corrected. Therefore, at the final closing position of each segment, it is possible to mold into a highly accurate annular mold that is accurately centered.
In addition, up to the middle position, the surface contact between the external ring and each segment enables the movement of each segment to be performed quickly, and thus the movement time of the segment as a whole can be shortened.
Further, the length of the segment side guide flat surface and the outer ring side guide flat surface in the circumferential direction is configured to be within the range of 40% to 60% of the length in the circumferential direction of the outer surface of each segment. As a result, the segment-side guide flat surface and the external ring-side guide flat surface can be made into a flat surface having a certain length (width). Therefore, when each segment is pushed by the external ring, each segment can be pushed more stably by the external ring, and the wobbling of the posture can be further prevented. Further, when opening the annular mold after the completion of vulcanization molding, the segment side guide flat surface and the external ring side guide flat surface can be brought into contact with each other even when a load that greatly moves the segment is applied. , Unnecessary movement of the segment can be prevented. Therefore, by preventing the posture of the segment from wobbling, it is possible to sufficiently reduce the damage and wear of the segment due to unnecessary contact or contact with the external ring, and it is possible to reduce the number of repairs and extend the service life. Further, it is possible to prevent the segment from biting into the tire as a product, and it is possible to prevent damage to the end portion of the tire or the divided surface of the segment.

Further, according to the tire vulcanization mold apparatus according to claim 2, in addition to the action and effect of the configuration according to claim 1, from the contact between the outer ring side guide flat surface and each segment side guide flat surface. Since the intermediate position that replaces the contact between the inner surface of the outer ring-side vulcanized cone and the outer surface of each segment-side vulcanized cone is adjustable.
The size of each segment according to the size of the annular mold, the position where the intermediate position, that is, the position where the surface contact between the flat surfaces is replaced with the line contact between the outer surface of the conical cone and the inner surface of the conical cone, is divided. It can be adjusted to the optimum position while adjusting according to various conditions such as the number, the moving distance of each segment, the size of the external ring, and the moving distance.
The optimum position is the most suitable position where the segment is less worn or damaged and the annular mold can be quickly and accurately assembled. As described above, such an optimum position changes depending on various conditions such as the size of each segment, the number of divisions, the moving distance of each segment, the size of the external ring, and the moving distance according to the size of the annular mold. Therefore, it is difficult to obtain the optimum from the beginning of the device. The optimum position can be obtained by making adjustments while performing a trial run of the device.

Further, according to the tire smelting mold apparatus according to claim 3, in addition to the action and effect by the configuration according to claim 1 or 2, the segment formed in a part of the segment-side conical outer surface. The side guide flat surface is configured such that the guide flat surface is arranged at a receding position recessed from the arc locus of the convex curved surface constituting the segment side head cone outer surface, and the outer ring side head cone is formed. The outer ring-side guide flat surface formed as a part of the inner side surface of the shape is arranged at an advance position where the guide flat surface is advanced from the arc locus of the concave conical curved surface constituting the outer ring-side conical inner surface. Because it is configured to be
As a specific configuration of the tire vulcanization mold device, the outer ring side guide flat surface actually contacts the segment side guide flat surface from the open position to the intermediate position before reaching the closed position of each segment. From the intermediate position to the closed position, the inner surface of the outer ring-side vulcanized cone can be pushed directly in contact with the outer surface of each segment-side vulcanized cone.

Further, according to the tire vulcanization die apparatus according to claim 4, in addition to the action and effect of the configuration according to any one of claims 1 to 3, the segment side guide flat surface and the external ring side guide flat surface are Since either one or both are composed of removable metal plates,
By using the metal plate, the segment side guide flat surface and the outer ring side guide flat surface can be easily formed.
In addition, even if the surface of either or both of the segment side guide flat surface and the external ring side guide flat surface composed of the metal plate is worn or damaged, the metal plate can be detachably replaced. It can also be updated. Therefore, the life of the segment or the external ring can be extended.
Further, according to the tire vulcanization die apparatus according to claim 5, in addition to the action and effect of the configuration according to claim 4, the thickness of the metal plate can be adjusted by cutting or polymerization.
The height of the segment side guide flat surface and the external ring side guide flat surface can be easily adjusted by adjusting the thickness with a metal plate without making adjustments such as scraping the segment body itself or the external ring body itself. It will be possible.
Further, according to the tire vulcanization die apparatus according to claim 6, in addition to the action and effect of the configuration according to claim 4, the metal plate is a copper alloy or a surface-treated iron alloy such as a soft nitriding treatment. In addition, because it is made of a material suitable for sliding,
In the surface contact between the guide flat surfaces, it is possible to maintain good sliding of the outer ring in the moving direction. In addition, in the case of a copper alloy, when the mating flat surface is an iron alloy, the wear can be concentrated on the metal plate made of the copper alloy to reduce the wear on the mating flat surface. When a ferroalloy treated with soft nitriding is used for both guide flat surfaces, it is possible to extend the life of the flat surface with less wear.

It is a perspective view which shows schematic the tire vulcanization die apparatus which concerns on embodiment of this invention. It is a horizontal sectional view which shows the relationship between each segment constituting the annular division mold of the tire vulcanization mold apparatus which concerns on embodiment of this invention, and an external ring, and (a) shows the initial state before the mold is assembled. The horizontal cross-sectional view shown, (b) is a horizontal cross-sectional view showing a state after the mold is assembled. It is a vertical cross-sectional view of the main part of the tire vulcanization die apparatus which concerns on embodiment of this invention, and is the figure which shows the state before the mold assembly is made. It is a vertical cross-sectional view of the main part of the tire vulcanization die apparatus which concerns on embodiment of this invention, and is the figure which shows the state after the mold assembly is made. In the horizontal cross-sectional view of the main part of the tire vulcanization mold apparatus according to the embodiment of the present invention, (a) is a state before the mold is assembled, and the outer ring side guide flat surface is still the segment side guide flat surface. The figure which shows the state which is not in contact, (b) is the figure which shows the state which the outer ring side guide flat surface has started contact with the segment side guide flat surface in the state at the initial stage of the mold assembly start. In the horizontal cross-sectional view of the main part of the tire vulcanization mold apparatus according to the embodiment of the present invention, (a) is a state in which the outer ring side guide flat surface is in contact with the segment side guide flat surface in the middle of the mold assembly. A diagram showing a state in which the inner side surface of the outer ring-side vulcanized cone abuts on the outer surface of the segment-side vulcanized cone. It is a figure which shows the completed state. It is a perspective view of the main part of the tire vulcanization die apparatus which concerns on embodiment of this invention. It is a perspective view of the main part which shows the modification of the tire vulcanization die apparatus which concerns on embodiment of this invention. It is a horizontal sectional view of the main part which shows the further modification of the tire vulcanization die apparatus which concerns on embodiment of this invention. It is a horizontal cross-sectional view of the main part which shows the conventional tire vulcanization die apparatus, (a) is a figure which shows the state before the mold assembly is made, (b) is the figure which shows the state which the mold assembly is unraveled.

The tire vulcanization mold apparatus of the present invention will be described with reference to the following drawings, and the present invention will be understood. However, the following description does not limit the invention described in the scope of claims for utility model registration of the present invention.

First, the tire vulcanization die device 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 2.
As shown in FIG. 1, the tire vulcanization die apparatus 1 according to the embodiment of the present invention has an upper die plate 2, a lower die plate 3, and an outer ring 4 as outer shells, and a tread portion of a tire is provided inside them. It includes an upper mold 5 for molding, a lower mold 6, and a plurality of annularly arranged segments 7 constituting an annular split mold. Vulcanization molding of automobile tires is performed by an upper mold 5 and a lower mold 6 for forming the tread portion, and an annular split mold composed of a plurality of segments 7.

As shown in FIG. 2, the segment 7 is composed of a plurality of segments 7, for example, nine in the present embodiment, and the plurality of segments 7 are arranged in a ring shape to form an annular split mold. In the annular split mold composed of a plurality of segments 7, the open state in which the segments 7 are opened in a ring shape as shown in FIG. 2A and the segments 7 as shown in FIG. 2B are mutually open. It can change to a closed state in which it is in close contact with the ring. Molding by the annular split mold is completed in a state of being in close contact with the closed state.
It should be noted that each segment 7 may be further composed of a plurality of parts.
One outer ring 4 is arranged on the outer side of each of the segments 7. The movement of the outer ring 4 causes each segment 7 to move inward and outward in the radial direction.

With reference to FIGS. 3 and 4, the external ring 4 is moved in one direction in the axial direction and in the opposite direction via a piston rod 8 of a cylinder (not shown). That is, the external ring 4 is moved in the vertical direction in FIGS. 3 and 4. More specifically, in the apparatus of the present embodiment, when the external ring 4 is moved from the upper side shown in FIG. 3 to the lower side shown in FIG. 4, each segment 7 is radially inward from the state shown in FIG. 3 (FIG. 3). Move to the right on 3). Then, as shown in FIG. 4, each segment 7 comes into contact with the upper mold 5 and the lower mold 6, and the segments 7 are in close contact with each other in an annular shape to complete the mold assembly.
By completing the mold assembly of the annular split mold by each segment 7, the tire vulcanization molding is ready.
On the other hand, when the outer ring 4 is moved upward from the state shown in FIG. 4 after the vulcanization molding is completed, each segment 7 is moved outward in the radial direction (to the left in FIG. 4). As a result, as shown in FIG. 3, each segment 7 is opened, and the mold is released and opened.

Hereinafter, the configuration and operation of the external ring 4 and the segment 7, which are the main components of the present invention, will be described in more detail.
With reference to FIGS. 5 to 7, the inner surface of the outer ring 4, that is, the inner surface in the radial direction, which is the surface facing each segment 7, is the inner surface having a conical shape that tapers upward. It constitutes the outer ring-side radial inner surface 41.
A band-shaped outer ring-side guide flat surface 42 extending in the axial direction is provided at a position facing each segment 7 on a part of the outer ring-side conical inner side surface 41. The outer ring-side guide flat surface 42 is configured to be inclined with the same slope as the outer ring-side head cone-shaped inner side surface 41.
Each of the segments 7 has a radial outer surface that is a surface facing the outer ring 4 and is configured as a head-conical outer surface that tapers upward, that is, a segment-side head-conical outer surface 71. .. The segment-side conical outer surface 71 is configured as a conical curved surface having the same slope as the outer ring-side conical inner surface 41.
A band-shaped segment-side guide flat surface 72 is provided in the central portion in the circumferential direction, which is a part of the segment-side conical outer surface 71. The segment-side guide flat surface 72 is configured to be inclined with the same slope as the segment-side truncated conical outer surface 71.
The external ring-side guide flat surface 42 and the segment-side guide flat surface 72 are located at positions facing each other, and when the external ring 4 descends, they mutually reach a position before reaching the final descending position. It is configured to be in surface contact.
The external ring 4 and each segment 7 can be made of a metal such as iron or aluminum.
Further, as shown in FIGS. 3 and 4, each segment 7 has a copper alloy, a soft nitrided iron alloy, or other good sliding in order to smoothly move between the upper plate 2 and the lower plate 3. The plate 9 is intervened so as to be replaceable.

The outer ring-side guide flat surface 42 can be configured by using an outer ring-side metal plate 43 that is separate from the outer ring 4 main body. In this case, a strip-shaped recess 44 is formed in a part of the outer ring-side conical inner side surface 41 in the axial direction, and the strip-shaped outer ring-side metal plate 43 is detachably attached to the recess 44. can do.
The upper surface of the outer ring-side metal plate 43 attached to the recess 44 serves as the outer ring-side guide flat surface 42.
The outer ring side guide flat surface 42 is configured as a surface perpendicular to the radial direction of the outer ring 4.
The external ring-side metal plate 43 can be attached to the recess 44 in a detachable manner by using other attaching means such as a screw 10.
Further, for the outer ring side metal plate 43, a copper alloy, a surface-treated iron alloy such as a soft nitriding treatment, or another material suitable for sliding can be used.

With reference to FIG. 7, the outer ring-side guide flat surface 42 has an advance position where the flat surface 42 advances from the arc locus 41a of the concave conic section curved surface constituting the outer ring-side conical inner surface 41. It is arranged so as to be. More specifically, the external ring side guide is set so that the step S1 between the upper surface (external ring side guide flat surface 42) and the recess 44 of the external ring side metal plate 43 becomes zero or more. The flat surface 42 will be arranged at the advance position.
By forming the step S1, the thickness of the outer ring-side metal plate 43 can be adjusted, and the advance position of the outer ring-side guide flat surface 42 can be adjusted.
It is also possible to configure the step S1 as zero. However, in this case, the advance height of the external ring side guide flat surface 42 cannot be adjusted.
By arranging the outer ring side guide flat surface 42 at the advance position advanced from the arc locus 41a of the outer ring side conical inner side surface 41, the contact between the outer ring 4 and each segment 7 can be brought into contact with the outer ring side. It is possible to use the outer ring-side guide flat surface 42 and the segment-side guide flat surface 72 instead of the vertical cone-shaped inner side surface 41 and the segment-side vertical cone-shaped outer surface 71.
That is, when the annular split mold is assembled from the open state, at least at the initial stage, the outer ring 4 is still in a high position, so that the radius of curvature of the portion of the outer ring 4 in contact with the segment 7 is the curvature of the segment 7. Large enough compared to the radius. Therefore, the outer ring 4 tends to come into surface contact with the segment side guide flat surface 72 at the outer ring side guide flat surface 42 at the advanced position.

Reference numeral 11 is a T-shaped block. The T-shaped block 11 is detachably attached to the external ring 4 so as to penetrate the external ring-side metal plate 43 by an attachment means such as a screw 12.
The T-shaped block 11 is configured to be loosely fitted in the T-shaped groove 13 formed on the segment 7 side.
By loosely fitting the T-shaped block 11 and the T-shaped groove 13, the outer plate 4 and each segment 7 are connected to each other in a loosely fitted state. The loose fitting connection between the outer plate 4 and each segment 7 is used when the segment 7 is moved from the closed state to the open state. That is, by moving the outer plate 4 upward, each segment 7 loosely fitted in the outer plate 4 is moved outward in the radial direction, and the mold assembly is opened.
In FIGS. 3 and 4, reference numeral 14 is a stopper, and reference numeral 15 is a groove for a stopper. The upper limit and the lower limit of the movable range of the external ring 4 are determined by the stopper 14 and the stopper groove 15.

With reference to FIG. 7, the segment-side guide flat surface 72 has a receding position in which the flat surface 72 recedes from the arc locus 71a of the convex conic-shaped curved surface constituting the segment-side conical outer surface 71. Arranged like this. In other words, the segment-side guide flat surface 72 is configured as a flat surface in which the arc of the convex conic section curved surface constituting the segment-side conic-shaped outer surface 71 is cut into strings.
By arranging the segment-side guide flat surface 72 at a receding position recessed from the arc locus 71a of the concave conic curved surface of the segment-side conical outer surface 71, the contact between the external ring 4 and each segment 7 can be made external. Instead of the ring-side guide flat surface 42 and the segment-side guide flat surface 72, the outer ring-side head conic inner side surface 41 and the segment-side head conic-shaped outer surface 71 can be used.
That is, when the annular split mold is assembled from the open state, the outer ring 4 descends to the vicinity of the lowest lower position at the position near the mold assembly completion position, so that the portion of the outer ring 4 in contact with the segment 7 The radius of curvature becomes smaller to the vicinity of the same diameter as the radius of curvature of the segment 7. Therefore, in the outer ring 4, the outer ring-side guide flat surface 42 is in contact with the segment-side guide flat surface 72 in the retracted position, but the outer ring-side guide flat surface 41 is outside the segment-side head cone shape. It tends to come into contact with the side surface 71.

The segment-side guide flat surface 72 can also be configured by using the segment-side metal plate 73 that is separate from the segment 7 main body. In this case, a recess 74 is formed in the cut surface 75 in a state where a part of the segment-side conical outer surface 71 is cut, and the segment-side metal plate 73 is detachably attached to the recess 75. be able to.
The upper surface of the segment-side metal plate 73 attached to the recess 74 serves as the segment-side guide flat surface 72.
The segment-side guide flat surface 72 is usually configured to be flush with the cut surface 75. However, the segment-side guide flat surface 72 may protrude with a step S2 (see FIG. 8) with respect to the cut surface 75. When the step S2 is provided, the retracted position of the segment-side guide flat surface 72 can be adjusted by adjusting the thickness of the segment-side metal plate 73.
In any case, the segment-side guide flat surface 72 is in a receding position recessed from the arc locus 71a of the segment-side conical outer surface 71.
The segment side guide flat surface 72 is configured as a surface perpendicular to the radial direction of the segment 7 (radial direction of the outer ring 4).
The segment-side metal plate 73 can be attached to the recess 74 in a detachable manner by using an attaching means such as a screw (not shown).
Further, for the segment side metal plate 73, a copper alloy, a surface-treated iron alloy such as a soft nitriding treatment, or any other material suitable for sliding can be used.

The T-shaped groove 13 can be formed in a T-shape by utilizing the recess 74 and a pair of segment-side metal plates 73 attached to the recess 74.

Further, in the present embodiment, the length L of the external ring side guide flat surface 42 in the circumferential direction shown in FIG. 5A and the segment side guide flat surface arranged at a position facing the external ring side guide flat surface 42 are arranged. The length N in the circumferential direction of the surface 72 is configured to be within the range of 40% to 60% of the length M in the circumferential direction of the outer surface of each segment 7. If the length is shorter than 40%, when each segment 7 is closed, the external ring 4 cannot stably push each segment 7, causing a wobbling of the posture and opening each segment 7. When a load that causes each segment 7 to move significantly is applied, the segment side guide flat surface 72 and the external ring side guide flat surface 42 cannot be brought into contact with each other, and each segment 7 is greatly tilted, and each segment 7 is tilted significantly. This is because the tire 30 is damaged. If the length exceeds 60%, the outer ring-side conical inner surface 41 and the segment-side conical outer surface 71 are in line contact with each other in a state slightly before reaching the closing position of the annular mold. This is because sufficient play of movement cannot be generated in each segment 7, and the mutual positional relationship between each segment 7 and the outer ring 4 and between each segment 7 cannot be sufficiently corrected.
Here, the "length L in the circumferential direction of the external ring-side guide flat surface 42" is the length connecting both ends of the external ring-side guide flat surface 42 (external ring-side metal plate 43) provided with the T-shaped block 11. It means that. Further, the "length (width) N in the circumferential direction of the segment side guide flat surface 72" is the circumferential direction of the pair of segment side guide flat surfaces 72 (segment side metal plate 73) arranged with the T-shaped groove 13 interposed therebetween. It means the length connecting both ends on the outside.

The operation of the tire vulcanization die apparatus according to the embodiment of the present invention will be described with reference to FIGS. 3 to 6.
Now, as shown in FIG. 3, when the outer ring 4 is in the uppermost position, each segment 7 constituting the annular split mold is on the outermost side in the radial direction, and is shown in FIG. 5 (a). As shown, the mold is in the most open state.
In the state where the mold shown in FIG. 5A is most open, the outer ring 4 and each segment 7 are in a non-contact state. That is, the outer ring-side conical inner surface 41 and the outer ring-side guide flat surface 42 are both separated from the segment-side conical outer surface 71 and the segment-side guide flat surface 72.
Further, the segments 7 are also separated from each other.
Of course, the outer ring 4 and each segment 7 are connected to each other in a loosely fitted state by the T-shaped block 11 and the T-shaped groove 13.

When the outer ring 4 is lowered downward from the uppermost position (open position of each segment 7) of the outer ring 4 shown in FIG. 3, the ring radius of the outer ring 4 portion facing each segment 7 becomes smaller. Eventually, as shown in FIG. 5B, the outer ring-side guide flat surface 42 abuts (sliding) with the segment-side guide flat surface 72.
On the other hand, the outer ring-side cone-shaped inner side surface 41 maintains a state of being separated from the segment 7 side, that is, non-contact.
When the outer ring-side guide flat surface 42 abuts on the segment-side guide flat surface 72, the external ring 4 starts pushing the segment 7, and each segment 7 starts moving inward in the radial direction.
In this case, the pushing force of the segment 7 by the external ring 4 is due to the surface contact between the guide flat surfaces 42 and 72, so that the posture of the segment 7 is stable during movement and the segment 7 is swayed even if the speed is increased. hard. That is, it is prevented that the segment 7 hits the outer ring 4 and is damaged. In particular, in the present embodiment, the length L in the circumferential direction of the outer ring side guide flat surface 42 and the length N in the circumferential direction of the segment side guide flat surface 72 are the lengths in the circumferential direction of the outer surface of each segment 7. By being configured to have a length within the range of 40% to 60% of the M, the external ring side guide flat surface 42 and the segment side guide flat surface 72 have a certain length (width). It can be configured as a flat surface. Therefore, when each segment 7 is pushed by the external ring 4, each segment can be pushed more stably by the outer ring 4, and the wobbling of the posture can be further prevented.

With the further descent of the outer ring 4, each by the outer ring 4 in the state shown in FIG. 5B for a while, that is, the state where the outer ring side guide flat surface 42 is in surface contact with the segment side guide flat surface 72. The radial inward push of segment 7 continues.

When the outer ring 4 is lowered to an intermediate position before reaching the lowest position (closed position of each segment 7) of the outer ring 4 shown in FIG. 4, the outer ring 4 portion with respect to each segment 7 is divided even during that time. As the ring radius becomes smaller, the state shown in FIG. 6A is eventually reached.
That is, the outer ring 4 and each segment 7 have a surface contact between the outer ring-side guide flat surface 42 and the segment-side guide flat surface 72, as well as the outer ring-side sword-shaped inner side surface 41 and the segment-side sword-head conical shape. Line contact by the outer side surface 71 is started.

When the outer ring 4 is further lowered, the contact between the outer ring side guide flat surface 42 and the segment side guide flat surface 72 is eliminated, and the two 42 and 72 are separated from each other. That is, the pushing of the segment-side guide flat surface 72 by the external ring-side guide flat surface 42 ends.
Instead, the outer ring-side cone-shaped inner side surface 41 is pushed by the direct line contact with the segment-side head cone-shaped outer surface 71, and each segment 7 is moved.
The pushing force due to the line contact between the outer ring-side conical inner surface 41 and the segment-side conical outer surface 71 then continues to the closing position of the segment 7.

Then, when the outer ring 4 is lowered to the lowest position shown in FIG. 4, each segment 7 reaches the closed position as shown in FIG. 6 (b), and the molding of the annular split mold is completed.
At the closed position of each segment 7 at which the molding of the annular split mold is completed, the outer ring-side truncated cone-shaped inner surface 41 and the segment-side truncated cone-shaped outer surface 71 are in close contact with each other with the same radius of curvature, and each of them is in close contact with each other. Adjacent segments 7 are also in close contact with each other to complete the annular ring. On the other hand, the outer ring-side guide flat surface 42 and the segment-side guide flat surface 72 do not come into contact with each other and are separated from each other with a gap.

In a state slightly before reaching the closing position, it is preferable to push the outer ring-side conical inner surface 41 and the segment-side conical outer surface 71 by line contact. In the case of line contact, play of movement is possible in each segment 7, so that the posture can be adjusted during that time. Therefore, each segment 7 can sufficiently correct the mutual positional relationship between each segment 7 and the outer ring 4 and between each segment 7 before the final closing position, and the axis can be sufficiently corrected. Accurate and precise ring-shaped split molds can be assembled.

When opening each segment 7 in the closed state, the outer ring 4 descending to the lowest position is raised.
Since the T-shaped block 11 on the outer ring 4 side is loosely fitted to the T-shaped groove 13 on the segment 7 side, the T-shaped block 11 is caught in the T-shaped groove 13 due to the rise of the outer ring 4. Then, the segment 7 is dragged outward in the radial direction.
At this time, in the present embodiment, the length L in the circumferential direction of the outer ring side guide flat surface 42 and the length N in the circumferential direction of the segment side guide flat surface 72 are set in the circumferential direction of the outer surface of each segment 7. By configuring the length to be within the range of 40% to 60% of the length M in the above, even if a load that greatly moves the segment 7 is applied, the segment side guide flat surface 72 and the external ring The side guide flat surface 42 can be brought into contact with the side guide flat surface 42, and unnecessary movement of the segment 7 can be prevented. Therefore, by preventing the posture of the segment 7 from wobbling, it is possible to sufficiently reduce the damage and wear of the segment 7 due to unnecessary contact and contact with the external ring 4, and it is possible to reduce the number of repairs and extend the service life. can. Further, it is possible to prevent the segment 7 from biting into the tire 30 which is a product, and it is possible to prevent the tire 30 and the end portion of the divided surface of the segment 7 from being damaged.
The T-shaped block 11 is dimensionally designed so as not to come into contact with any inner wall of the T-shaped groove 13 while the outer ring 4 is descending downward.

In the present invention, when each segment 7 is pushed from the open position to the closed position by the descent of the external ring 4, the external ring side guide flat surface 42 and the segment side guide flat surface are reached up to the intermediate position before reaching the closed position. Surface contact with 72 is established, and direct line contact between the outer ring-side conical inner surface 41 and the segment-side conical outer surface 71 is established from the intermediate position to the closing position of the segment 7. It is configured to hold.
The "intermediate position" in which the external ring 4 and the segment 7 switch from the surface contact to the line contact is a position between the open position and the closed position, and this "intermediate position" is the closed position. The closer it is, the faster and more stable the mold assembly operation of the annular split mold can be performed. There is also an advantage that the segment 7 is not easily scratched. On the other hand, if the "intermediate position" is set too close to the closed position, the opportunity to adjust the final posture of each segment 7 with sufficient accuracy may be lost, and the molding may not be performed accurately. ..
Therefore, regarding the "intermediate position" where the contact between the outer ring 4 and the segment 7 replaces the surface contact with the line contact, the size of the radius of curvature of the annular division mold, the number of divisions of the segment 7, and the segment When assembling the device according to the material of 7, the moving speed of the segment 7, the length L in the circumferential direction of the external ring side guide flat surface 42, the length N in the circumferential direction of the segment side guide flat surface 72, and other conditions. It is preferable to configure it so that it can be adjusted at the time of trial run after assembly, at the time of subsequent repair, and the like.

With reference to FIG. 7, the adjustment of the "intermediate position" can be performed by adjusting the advance amount Q1 of the advance position with respect to the arc locus 41a of the outer ring side guide flat surface 42 on the outer ring 4 side. ..
Further, the adjustment of the "intermediate position" can be performed on the segment 7 side by adjusting the receding amount Q2 of the receding position with respect to the arc locus 71a of the segment side guide flat surface 72.

Increasing the advance amount Q1 of the outer ring-side guide flat surface 42 facilitates contact with the segment-side guide flat surface 72. On the other hand, it becomes difficult for the outer ring-side conical inner surface 41 to come into contact with the segment-side conical outer surface 71. That is, the contact between the outer ring-side guide flat surface 42 and the segment-side guide flat surface 72 is long, and the contact between the outer ring-side head conical inner side surface 41 and the segment-side head conical outer surface 71 is short. Then, the "intermediate position" becomes closer to the closed position.
When the advance amount Q1 of the external ring side guide flat surface 42 is reduced, the "intermediate position" becomes far from the closed position.
Further, if the retreat amount Q2 of the segment side guide flat surface 72 is increased, it becomes difficult to come into contact with the external ring side guide flat surface 42. On the other hand, the outer ring-side conical inner side surface 41 and the segment-side conical outer surface 71 are more likely to come into contact with each other. That is, the contact between the outer ring-side guide flat surface 42 and the segment-side guide flat surface 42 is short, and the contact between the outer ring-side head conical inner side surface 41 and the segment-side head conical outer surface 71 becomes longer. Then, the "midway position" becomes far from the closed position.
When the retreat amount Q2 of the segment side guide flat surface 72 is reduced, the "intermediate position" becomes closer to the closed position.

To adjust the advance amount Q1 of the external ring side guide flat surface 42, specifically, the thickness of the external ring side metal plate 43 is adjusted at the time of assembling the tire vulcanization mold device, at the time of trial run after assembly, and at the time of subsequent repair. , Can be adjusted.
Specifically, this can be done by adjusting the step S1 dimension between the upper surface of the external ring-side metal plate 43 constituting the external ring-side guide flat surface 42 and the recess 44.
More specifically, this can be done by adjusting the thickness of the outer ring-side metal plate 43. The thickness of the outer ring-side metal plate 43 having the step S1 can be adjusted by scraping the upper surface or the lower surface of the outer ring-side metal plate 43. Further, it can be performed by replacing the metal plate 43 on the outer ring side with a metal plate having a different thickness.
The metal plate 43 on the outer ring side and the T-shaped block 11 are detachably attached to the main body of the outer ring 4 by screws 10 and 12.

On the other hand, the adjustment of the retreat amount Q2 of the segment side guide flat surface 72 is specifically performed by adjusting the thickness of the segment side metal plate 73 at the time of assembling the tire vulcanization die device, at the time of trial run after assembly, and at the time of subsequent repair. It can be adjusted.
However, in the embodiment shown in FIGS. 3 to 7, no step is provided between the upper surface of the segment-side metal plate 73 constituting the segment-side guide flat surface 72 and the recess 74. Therefore, in the embodiment shown in FIGS. 3 to 7, the adjustment of the intermediate position is mainly performed by adjusting the thickness of the outer ring side metal plate 43.
The segment-side metal plate 73 can be detachably attached to the main body of the segment 7 by an attachment means such as a screw (not shown). When the step is not provided, the segment side metal plate 73 does not necessarily have to be provided. The cut surface 75 may be formed on the segment 7 itself to form the segment side guide flat surface 72, and the T-shaped groove 13 may be formed on the segment 7 itself.

In the modified example shown in FIG. 8, as a means for adjusting the advance amount Q1 of the external ring side guide flat surface 42, a plurality of external ring side metal plates 43 are used so that the number can be increased or decreased. It is also possible to adjust the advance amount Q1 by changing the number of superposed metal plates 43 on the outer ring side.
In FIG. 8, the thickness of the external ring-side metal plate 43 is adjusted by increasing or decreasing the number of the external ring-side metal plates 43 by detachably removing the metal plate 43 and the T-shaped block 11 from the main body of the external ring 4 with screws 10 and 12. It can be done by changing the number of 43 and fixing the screws 10 and 12 again.
Further, in the modified example shown in FIG. 8, as a means for adjusting the receding amount Q2 of the segment side guide flat surface 72, the segment side metal plate 73 is made to protrude from the cut surface 75 with a step S2, and the protruding segment side metal plate 73. It is possible to do this by scraping the upper or lower surface of the. In this case, the segment-side metal plate 73 is detachably attached to the main body of the segment 7 by an attachment means such as a screw (not shown).

In yet another modification shown in FIG. 9, an example in which the mounting arrangement of the T-shaped block 11 and the T-shaped groove 13 is reversed is shown. That is, the T-shaped groove 13 is formed on the outer ring 4 side, and the T-shaped block 11 is formed on the segment 7 side. In this case, the outer ring-side metal plate 43 is in a divided state for receiving the T-shaped block 11. Therefore, in this case, the length P connecting both ends of the pair of external ring-side guide flat surfaces 42 (external ring-side metal play 43) arranged across the T-shaped groove 13 in the circumferential direction is set to each segment. The length is configured to be within the range of 40% to 60% of the length M in the circumferential direction of the outer surface of 7.
The same members and the same functions as those in the above-described embodiment are assigned the same numbers, and the description thereof will be omitted.

The tire vulcanization mold device of the present invention is useful in the field of manufacturing automobile tires and has great industrial applicability.

1 Tire smelting mold device 2 Upper mold plate 3 Lower mold plate 4 External ring 5 Upper mold 6 Lower mold 7 Segment 8 Piston rod 9 Good sliding plate 10 Screw 11 T-block 12 Screw 13 T-groove 14 Stopper 15 Stopper groove 21 External ring 21a Vertical conical surface 21b T-shaped block 22 Segment 22a Vertical conical surface 22b T-shaped groove 30 Tire 41 External ring side Horizontal conical inner surface 41a Arc locus 42 External ring side guide flat Surface 43 External ring-side metal plate 44 Recess 71 Segment-side conical outer surface 71a Arc locus 72 Segment-side guide flat surface 73 Segment-side metal plate 74 Recess 75 Cut surface L Length M Length N Length P Length Q1 Advance amount Q2 Retreat amount S1 Step S2 Step T Biting point U Contact point

Claims (6)

A plurality of segments constituting an annular split mold for forming a tread portion of a tire and an outer ring arranged radially outward of the plurality of segments are provided, and the outer ring is moved in one direction in the axial direction. As a result, the outer ring pushes each segment inward in the radial direction to close the annular split mold, and the outer ring is moved in the direction opposite to the one direction in the axial direction to move each segment into a radius. It is a tire vulcanization die device configured to open the annular split die by moving it outward in the direction.
The outer surface of each of the segments and the inner surface of the outer ring facing the outer surface are formed into a segment-side conical outer surface and an outer ring-side conical inner surface facing each other.
A part of the outer surface of the side cone of each segment and a part of the inner side surface of the cone of the outer ring form a segment side guide flat surface and an outer ring side guide flat surface facing each other. The length of the segment-side guide flat surface and the external ring-side guide flat surface in the circumferential direction is within the range of 40% to 60% of the circumferential length of the outer surface of each segment. It is configured in
Further, the push of each segment by the external ring is such that the outer ring side guide flat surface comes into surface contact with the segment side guide flat surface and is pushed until the intermediate position before reaching the closed position from the open position of each segment. From the intermediate position to the closing position of each segment, instead of the contact between the external ring-side guide flat surface and the segment-side guide flat surface, the external ring-side vulcanized inner surface surface is formed. Is a tire vulcanization mold device characterized in that it is configured to directly contact and push against the outer surface of the cone on the side of each segment. Adjustable intermediate position to replace the contact between the outer ring-side guide flat surface and each segment-side guide flat surface with the contact between the outer ring-side vulcanized inner surface and each segment-side vulcanized outer surface. The tire vulcanization mold apparatus according to claim 1, wherein the tire vulcanization mold apparatus is configured in the above. The segment-side guide flat surface, which is composed of a part of the segment-side cone-shaped outer surface, is a receding guide whose guide flat surface recedes from the arc locus of the convex curved surface constituting the segment-side head cone-shaped outer surface. The outer ring-side guide flat surface, which is configured to be placed in position and is part of the outer ring-side sword-conical inner surface, is such that the guide flat surface is the outer ring-side sword-conical inner surface. The tire sulfurizing mold apparatus according to claim 1 or 2, wherein the conical conical curved surface is configured to be arranged at an advanced position that is advanced from the arc locus of the curved surface. The tire vulcanizing die according to any one of claims 1 to 3, wherein either one or both of the segment side guide flat surface and the external ring side guide flat surface are formed of a detachable metal plate. Mold device. The tire vulcanization die apparatus according to claim 4, wherein the thickness of the metal plate can be adjusted by cutting or polymerization. The tire vulcanization die device according to claim 4, wherein the metal plate is made of a copper alloy, a surface-treated iron alloy such as a soft nitriding treatment, or a material suitable for sliding.

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