JP2019199023A - Tire vulcanization mold device - Google Patents

Abstract

To provide a tire vulcanization mold device capable of reducing a number of repairs and extending a service life by preventing segment damage and wear, improving an assembly accuracy of an annular mold and preventing damage to a produced tire, and improving productivity by quickly moving.SOLUTION: A tire vulcanization mold device has a constitution in which: each segment 7 is pushed by an outer ring 4 while an outer ring side guide flat surface 42 comes into contact with a segment side guide flat surface 72 from open position of each segment 7 to a middle position just before reaching a closing position; and each segment 7 is pushed by the outer ring 4 while an outer ring side truncated inner side surface 41 directly contacts with each segment side truncated outer side surface 71 from the middle position to a closing position of each segment 7. A length N and L in a circumferential direction of the segment side guide flat surface 72 and the outer ring side guide flat surface 42 are configured to be 40% to 60% of a length M in a circumferential direction of an outer surface of each segment 7.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a tire vulcanization mold apparatus, and more particularly to a tire vulcanization mold apparatus for vulcanizing an automobile tire or the like.

2. Description of the Related Art Conventionally, as a mold apparatus for molding an automobile tire, a mold apparatus called a tire vulcanization mold for molding a tire while vulcanizing the tire has been provided. The tire vulcanizing mold apparatus includes an annular mold that molds the tread portion of the tire.
In recent years, as the annular mold for forming the tread portion of the tire, an annular mold formed by dividing the annular mold into a plurality of parts in the circumferential direction is often used. Each of these divided molds is referred to as a segment. As a tire vulcanization mold provided with such an annular mold composed of a plurality of segments, for example, there is Patent Document 1 below.

JP 60-78711 A

The above-mentioned Patent Document 1 is an invention relating to a tire vulcanizer having an annular mold made up of a plurality of segments. In this tire vulcanizer, since the thickness of the segment in the radial direction can be reduced, there is an advantage that the outer dimensions of the vulcanizable tire can be increased.
As shown in FIG. 10, the conventional tire vulcanizing mold as shown in Patent Document 1 has a frustoconical surface 21a inside the outer ring 21 located radially outward of each segment 22, and each The outer side of the segment 22 is a frustoconical surface 22a, and the outer ring 21 is moved downward from above to move each segment 22 from the outside in the radial direction to close the annular mold. Thus, the annular mold is assembled. When the annular mold is closed and assembled, the frustoconical surface 21a on the inner side of the outer ring 21 is in close contact with the frustoconical surface 22a on the outer side of each segment 22.
On the other hand, after the vulcanization molding is completed, the outer ring 21 is moved upward from below to move each segment 22 from the inside in the radial direction to the outside, thereby opening the annular mold. Specifically, the T-shaped block 21b on the outer ring 21 side is loosely fitted to the T-shaped groove 22b on each segment 22 side, so that the T-shaped block 21b is moved into the T-shaped groove 22b by the rising of the outer ring 21 In this state, each segment 22 is moved radially outward (in the direction of the hollow arrow shown in FIG. 10B) to open the annular mold.
However, as shown in FIG. 10 (a), the conventional tire external vulcanization mold apparatus is a region where the ring is moved from the upper side to the lower side, that is, the outer ring 21 completely closes each segment 22. In the entire region before reaching the lower position, the radius of curvature of the arc of the frustoconical surface 21a of the outer ring 21 in contact with each other is larger than the radius of curvature of the arc of the frustoconical 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 very unstable during movement, and repeats local contact and contact with the outer ring 21, which easily causes wear and damage to the segment and decreases dimensional accuracy. There was a problem of inviting. In addition, there is a problem that the posture of each segment 22 is collapsed and a smooth operation cannot be obtained, and that a good assembly accuracy of the annular mold is difficult to obtain.
Further, as shown in FIG. 10B, after the vulcanization molding is completed, 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. The load when opening is not a uniform load on each segment. For this reason, each segment 22 is in an extremely unstable state even during movement when the annular mold is opened. Particularly when the movement of the segment 22 is large, local contact with the T-shaped block 21b ( For example, a portion indicated by a contact portion U surrounded by a broken line in FIG. 10B and a biting into the tire 30 (for example, a portion indicated by a biting portion T surrounded by a broken line in FIG. 10B) are generated. There is a problem that damage occurs to the tire part and the tire 30. In addition, since the end of the segment 22 bites into the tire 30, there is a problem that the end of the segmented surface of the segment 22 is easily damaged.

  Therefore, the present invention solves the above-mentioned problems of the prior art, and can reduce the number of repairs and increase the life by preventing damage and wear of the annular mold segment, and can also be assembled by closing each segment. Improves the accuracy and stability of mold assembly (mold assembly), prevents damage to the product tire, and stabilizes the posture of the segment while moving. It is an object of the present invention to provide a tire vulcanization mold apparatus capable of improving the quality.

A tire vulcanization mold apparatus according to the present invention includes a plurality of segments constituting an annular split mold for molding a tread portion of a tire, and an outer ring disposed radially outward of the plurality of segments, By moving the outer ring in one axial direction, the outer ring pushes each segment radially inward to close the annular split mold, and the outer ring is opposite to the one axial direction. A tire vulcanization mold apparatus configured to move each segment radially outward by moving in a direction to open an annular split mold,
The outer surface of each segment and the inner surface of the outer ring facing it are configured as a segment side frustoconical outer surface and an outer ring side frustoconical inner surface facing each other,
A part of each segment side frustoconical outer surface and a part of the outer ring side frustoconical inner surface constitute a segment side guide flat surface and an outer ring side guide flat surface facing each other. In addition, the length in the circumferential direction of the segment side guide flat surface and the outer ring side guide flat surface is a length within the range of 40% to 60% of the length in the circumferential direction of the outer side surface of each segment. Configured
In addition, the pushing of each segment by the outer ring pushes the outer ring side guide flat surface into contact with the segment side guide flat surface until the middle position just before reaching the closing position of each segment. And the outer ring side frustoconical inner surface instead of the contact between the outer ring side guide flat surface and the segment side guide flat surface from the midway position to the closing position of each segment. The first feature is that the structure is configured such that each segment side frustoconical outer surface is in direct contact with and pushed.

  Further, in addition to the first feature, the tire vulcanizing mold apparatus according to the present invention includes an outer ring-side frustoconical inner surface and each of the outer ring-side frustoconical inner surface and the contact between the outer ring-side guide flat surface and each segment-side guide flat surface. The second feature is that the intermediate position instead of the contact with the segment side frustoconical outer surface is adjustable.

  Further, in the tire vulcanization mold apparatus according to the present invention, in addition to the first or second feature, the segment side guide flat surface formed on a part of the segment side frustoconical outer surface is the guide flat surface. Is configured to be disposed at a retracted position that is retracted from the arcuate locus of the convex curved surface constituting the segment-side frustoconical outer surface, and is configured as a part of the outer ring-side frustoconical inner surface. The outer ring-side guide flat surface is configured so that the guide flat surface is arranged at an advanced position that is advanced from the arc trajectory of the concave conical curved surface constituting the outer ring-side truncated conical inner surface. 3 features.

Further, in addition to any of the first to third features, the tire vulcanizing mold apparatus according to the present invention can attach or detach either one or both of the segment side guide flat surface and the outer ring side guide flat surface. The fourth feature is that the metal plate is used.
In addition to the fourth feature, the tire vulcanization mold of the present invention has a fifth feature that the thickness of the metal plate can be adjusted by cutting or polymerization.
In the tire vulcanization mold apparatus according to the present invention, in addition to the fourth feature described above, the metal plate is made of a copper alloy or a surface-treated iron alloy such as soft nitriding, or other material suitable for sliding. Is the sixth feature.

According to the tire vulcanization mold apparatus according to claim 1, a part of each segment side frustoconical outer surface and a part of the outer ring side frustoconical inner surface are opposed to each other on the segment side. Since the guide flat surface and the outer ring side guide flat surface are configured,
Each segment can be pushed by the outer ring by bringing the outer ring side guide flat surface into contact with the segment side guide flat surface. Accordingly, each segment is stably pushed in a surface contact state with respect to the outer ring, and the posture is not fluctuated. Therefore, it is possible to sufficiently reduce the damage and wear of the segment due to unnecessary contact with or contact with the outer ring, and it is possible to reduce the number of repairs and extend the life.
In addition, the pushing of each segment by the outer ring can be performed by bringing the outer ring side guide flat surface into contact with the segment side guide flat surface, thereby preventing the posture of the segment from wobbling during movement of the outer ring. Therefore, the movement of the outer ring can be made faster and the segment can be pushed more quickly. Therefore, the time required for assembling the annular mold (mold assembly) can be shortened to improve productivity.
In addition, the pushing of each segment by the outer ring pushes the outer ring side guide flat surface into contact with the segment side guide flat surface until the middle position just before reaching the closing position of each segment. And the outer ring side frustoconical inner surface instead of the contact between the outer ring side guide flat surface and the segment side guide flat surface from the midway position to the closing position of each segment. Since it is configured to push directly in line contact with each segment side frustoconical outer surface,
From the middle position to the closing position, the outer ring side frustoconical inner surface pushes each segment while directly contacting the segment side frustoconical outer surface. There is some play in the movement of the movement, so that the mutual positional relationship between each segment and the outer ring is reliably corrected. Therefore, at the final closing position of each segment, it can be assembled into a highly accurate annular mold accurately centered.
In addition, up to a midway position, each segment can be quickly moved by the surface contact between the outer ring and each segment, so that the entire segment moving time can be shortened.
Furthermore, the length in the circumferential direction of the segment side guide flat surface and the outer ring side guide flat surface is configured to be within a range of 40% to 60% of the length in the circumferential direction of the outer side surface of each segment. Thus, the segment side guide flat surface and the outer ring side guide flat surface can be made flat surfaces having a certain length (width). Therefore, when the segments are pushed by the outer ring, the segments can be pushed more stably by the outer ring, and the wobble of the posture can be further prevented. Also, when opening the annular mold after the vulcanization molding is completed, the segment-side guide flat surface and the outer ring-side guide flat surface can be brought into contact with each other even when a load that greatly moves the segment is applied. , Prevent unnecessary movement of the segment. Therefore, by preventing the wobbling of the posture of the segment, it is possible to sufficiently reduce the damage and wear of the segment due to unnecessary contact with and contact with the outer ring, and it is possible to reduce the number of repairs and extend the life. Moreover, it can prevent that a segment bites into the tire which is a product, and can prevent that the edge part of the division surface of a tire or a segment arises.

According to the tire vulcanizing mold apparatus of the second aspect, in addition to the function and effect by the configuration of the first aspect, the contact between the outer ring side guide flat surface and each segment side guide flat surface is achieved. Because the middle position to replace the contact between the outer ring side frustoconical inner surface and each segment side frustoconical outer surface is configured to be adjustable,
The middle position, that is, the position where the flat surface is replaced by the line contact between the frustoconical outer surface and the frustoconical inner surface, the size of each segment according to the size of the annular mold, division It is possible to adjust to an optimal position while adjusting according to various conditions such as the number, the moving distance of each segment, the size of the outer ring, and the moving distance.
The optimum position is the most suitable position where the wear and damage of the segment is reduced, and the annular mold assembly can be quickly and accurately performed. As described above, the optimum position varies 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 outer 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 performing adjustment while performing a trial run of the apparatus.

Further, according to the tire vulcanizing mold apparatus of the third aspect, in addition to the function and effect of the configuration according to the first or second aspect, the segment configured on a part of the segment side frustoconical outer surface. The side guide flat surface is configured such that the guide flat surface is disposed at a retracted position that is retracted from the arc trajectory of the convex curved surface constituting the segment side frustoconical outer surface. The outer ring side guide flat surface that is configured as a part of the inner side surface of the ring is located at the advanced position where the guide flat surface has advanced beyond the arc trajectory of the concave conical curved surface that forms the outer ring side truncated conical inner surface. Because it is configured to
As a specific configuration of the tire vulcanizing mold apparatus, the outer ring side guide flat surface is actually in surface contact with the segment side guide flat surface from the open position of each segment to the middle position before reaching the closed position. From the midway position to the closing position, the outer ring-side frustoconical inner surface can directly abut against each segment-side frustoconical outer surface and can be pushed.

According to the tire vulcanization mold apparatus of the fourth aspect, in addition to the function and effect of the configuration according to any one of the first to third aspects, the segment side guide flat surface and the outer ring side guide flat surface Since either or both are made up 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, one or both of the segment side guide flat surface and the outer ring side guide flat surface made of a metal plate can be changed by detachably replacing the metal plate even if the surface is worn or damaged. Can be updated again. Therefore, the life of the segment and the outer ring can be extended.
Further, according to the tire vulcanization mold apparatus according to claim 5, in addition to the function and effect of the configuration according to claim 4, the thickness of the metal plate can be adjusted by cutting or polymerization.
The height adjustment on the segment side guide flat surface and the outer ring side guide flat surface can be easily performed by adjusting the thickness with a metal plate without adjusting the segment body itself or the outer ring body itself. It becomes possible.
According to the tire vulcanization mold apparatus of claim 6, in addition to the function and effect of the configuration of claim 4, the metal plate is a copper alloy or a surface-treated iron alloy such as soft nitriding, In addition, because it is made of a material suitable for sliding,
In the surface contact between the guide flat surfaces, the sliding in the moving direction of the outer ring can be favorably maintained. In addition, in the case of a copper alloy, when the counterpart flat surface is an iron alloy, the wear can be concentrated on the metal plate made of the copper alloy to reduce the wear of the counterpart flat surface. In addition, when a soft nitriding iron alloy is used for both guide flat surfaces, a long life can be achieved by a flat surface with little wear.

1 is a perspective view schematically showing a tire vulcanization mold apparatus according to an embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a horizontal sectional view which shows the relationship between each segment and outer ring which comprise the cyclic | annular division mold of the tire vulcanization mold apparatus which concerns on embodiment of this invention, (a) is an initial state before a die assembly is made. The horizontal sectional view which shows is, and (b) is a horizontal sectional view which shows the state after a type | mold assembly was made. It is a longitudinal cross-sectional view of the principal part of the tire vulcanization mold apparatus concerning the embodiment of the present invention, and is a figure showing the state before a model combination is made. It is a longitudinal cross-sectional view of the principal part of the tire vulcanization mold apparatus concerning the embodiment of the present invention, and is a figure showing the state after a die assembly was made. It is a horizontal sectional view of the principal part of the tire vulcanization mold device concerning an embodiment of the present invention, and (a) is in the state before a die is assembled, and an outer ring side guidance flat surface is still a segment side guidance flat surface. The figure which shows the state which has not contact | abutted, (b) is a figure which shows the state which the outer ring side guide flat surface started contact | abutting to the segment side guide flat surface in the initial stage of mold assembly start. BRIEF DESCRIPTION OF THE DRAWINGS It is a horizontal sectional view of the principal part of the tire vulcanization mold device concerning an embodiment of the present invention, and (a) is in the middle of a mold assembly, and the outer ring side guide flat surface contacted the segment side guide flat surface. FIG. 5B is a diagram showing a state in which the outer ring-side frustoconical inner surface is switched to a state in which the outer ring-side frustoconical inner surface abuts on the segment-side frustoconical outer surface. FIG. It is a figure which shows the state which completed. It is a perspective view of the principal part of the tire vulcanization mold device concerning the embodiment of the present invention. It is a perspective view of the principal part which shows the modification of the tire vulcanization mold apparatus which concerns on embodiment of this invention. It is a horizontal sectional view of the important section showing still another modification of the tire vulcanization mold device concerning the embodiment of the present invention. It is the horizontal sectional view of the principal part which shows the conventional tire vulcanization mold apparatus, (a) is a figure which shows the state before a mold assembly is made, (b) is a figure which shows the state by which a mold assembly is released.

  The tire vulcanization mold apparatus of the present invention will be described with reference to the following drawings for understanding of the present invention. However, the following description does not limit the invention described in the claims of the present invention.

First, with reference to FIGS. 1-2, the tire vulcanization mold apparatus 1 which concerns on embodiment of this invention is demonstrated.
As shown in FIG. 1, a tire vulcanization mold apparatus 1 according to an embodiment of the present invention has an upper mold plate 2, a lower mold plate 3, and an outer ring 4 as outer shells, and a tread portion of the tire is provided inside them. An upper mold 5 for molding, a lower mold 6, and a plurality of annularly arranged segments 7 constituting an annular split mold are provided. Vulcanization molding of automobile tires is performed with an upper mold 5 and a lower mold 6 that form the tread portion, and an annular divided mold including a plurality of segments 7.

As shown in FIG. 2, the number of segments 7 is nine, for example, nine in this embodiment, but the plurality of segments 7 are arranged in a ring to form an annular split mold. The annular split mold composed of a plurality of segments 7 has an open state in which the segments 7 are opened in a ring shape as shown in FIG. 2A, and each segment 7 as shown in FIG. It is possible to change to a closed state in close contact with the ring. The mold assembly by the annular split mold is completed in the state of being in close contact with the closed state.
Each segment 7 may further be configured by a plurality of portions.
One outer ring 4 is arranged outside each segment 7. As the outer ring 4 moves, the segments 7 move inward and outward in the radial direction.

Referring also to FIGS. 3 and 4, the outer ring 4 is moved in one axial direction and in the opposite direction via a piston rod 8 of a cylinder (not shown). That is, the outer ring 4 is moved in the vertical direction in FIGS. More specifically, in the apparatus of the present embodiment, when the outer 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 to the right). 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 a ring shape to complete the mold assembly.
Preparation of the tire vulcanization molding is completed by completing the mold of the annular split mold by each segment 7.
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 radially outward (leftward 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 outer ring 4 and the segment 7 which are main components of the present invention will be described in more detail.
Referring also 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 a frustoconical inner surface tapering upward, The outer ring side frustoconical inner side surface 41 is formed.
A part of the outer ring side truncated conical inner side surface 41 is provided with a belt-like outer ring side guide flat surface 42 extending in the axial direction at a position facing each segment 7. The outer ring side guide flat surface 42 is configured to be inclined with the same gradient as the outer ring side frustoconical inner side surface 41.
Each of the segments 7 has a radially outer surface, which is a surface facing the outer ring 4, formed into a frustoconical outer surface tapering upward, that is, a segment side frustoconical outer surface 71. . The segment side frustoconical outer side surface 71 is configured as a conical curved surface having the same gradient as the outer ring side frustoconical inner side surface 41.
A belt-like segment-side guide flat surface 72 is provided in the axial direction at a central portion in the circumferential direction, which is a part of the segment-side truncated conical outer surface 71. The segment side guide flat surface 72 is inclined with the same gradient as the segment side frustoconical outer surface 71.
The outer ring side guide flat surface 42 and the segment side guide flat surface 72 are in a position facing each other, and when the outer ring 4 is lowered, the outer ring side guide flat surface 42 and the segment side guide flat surface 72 It is set as the structure which carries out surface contact.
In addition, the said outer ring 4 and each segment 7 can be comprised with metals, such as iron and aluminum.
Also, as shown in FIGS. 3 and 4, each segment 7 has a smooth movement between the upper mold plate 2 and the lower mold plate 3, so that copper alloy, soft nitriding iron alloy, and other good sliding The plate 9 is interposed in a replaceable manner.

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 main body of the outer ring 4. In this case, a band-shaped recess 44 is formed in a part of the outer ring-side truncated conical inner side surface 41 in the axial direction, and the outer ring-side metal plate 43 is detachably attached to the recess 44 in a band shape. can do.
The upper surface of the outer ring side metal plate 43 attached to the recess 44 becomes 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 outer ring side metal plate 43 can be attached to the recess 44 in a detachable manner using other attachment means such as the screw 10.
The outer ring side metal plate 43 may be made of a copper alloy, a surface-treated iron alloy such as soft nitriding, or other materials suitable for sliding.

Referring to FIG. 7, the outer ring side guide flat surface 42 has an advanced position where the flat surface 42 has advanced more than the arc-shaped locus 41 a of the concave conical curved surface constituting the outer ring side truncated conical inner surface 41. It is arranged to be. More specifically, the outer ring side guide is provided by setting the step S1 between the upper surface of the outer ring side metal plate 43 (outer ring side guide flat surface 42) and the recess 44 to be zero or more. The flat surface 42 is disposed at the advanced 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 advancement height of the outer ring side guide flat surface 42 cannot be adjusted.
By arranging the outer ring side guide flat surface 42 at the advanced position advanced from the circular arc locus 41a of the outer ring side frustoconical inner side surface 41, the contact between the outer ring 4 and each segment 7 can be improved. Instead of the frustoconical inner side surface 41 and the segment side frustoconical outer surface 71, the outer ring side guide flat surface 42 and the segment side guide flat surface 72 can be used.
That is, when the annular divided mold is assembled from the open state, at least in the initial stage, the outer ring 4 is still in a high position, and therefore 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. For this reason, 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 denotes a T-shaped block. The T-shaped block 11 is detachably attached to the outer ring 4 so as to penetrate the outer ring-side metal plate 43 by attaching means such as screws 12.
The T-shaped block 11 is configured to be loosely fitted in a T-shaped groove 13 formed on the segment 7 side.
When the T-shaped block 11 and the T-shaped groove 13 are loosely fitted, the external plate 4 and each segment 7 are connected in a loosely fitted state. The loose coupling between the external 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, the segments 7 loosely fitted on the outer plate 4 are moved outward in the radial direction, and the mold assembly is released.
3 and 4, reference numeral 14 denotes a stopper, and reference numeral 15 denotes a stopper groove. The upper limit and the lower limit of the movable range of the outer ring 4 are determined by the stopper 14 and the stopper groove 15.

Referring to FIG. 7, the segment side guide flat surface 72 is in a retreat position where the flat surface 72 is retracted from the arcuate locus 71 a of the convex conical curved surface constituting the segment side frustoconical outer surface 71. Are arranged as follows. In other words, the segment side guide flat surface 72 is configured as a flat surface obtained by cutting a circular arc of a convex conical curved surface constituting the segment side frustoconical outer surface 71 into a chord.
By arranging the segment side guide flat surface 72 at the retracted position that is retracted from the arc locus 71a of the concave conical curved surface of the segment side frustoconical outer surface 71, the contact between the outer ring 4 and each segment 7 can be Instead of the ring-side guide flat surface 42 and the segment-side guide flat surface 72, the outer ring-side frustoconical inner surface 41 and the segment-side frustoconical outer surface 71 can be used.
That is, when the annular divided mold is assembled from the open state, the outer ring 4 descends to the vicinity of the lowest lowered position at the position near the mold assembly completion position. The radius of curvature decreases to the vicinity of the same diameter as the radius of curvature of the segment 7. For this reason, the outer ring 4 has an outer ring-side frustoconical inner side surface 41 that is outside the segment-side frustoconical outer shape than the outer ring-side guiding flat surface 42 abuts against the segment-side guiding flat surface 72 in the retracted position. It tends to abut against the side surface 71.

The segment side guide flat surface 72 can also be configured by using a segment side metal plate 73 that is separate from the segment 7 body. In this case, a recess 74 is formed in the cut surface 75 in a state where a part of the segment side truncated 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 becomes 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 from the cut surface 75 with a step S2 (see FIG. 8). When the step S <b> 2 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 retracted position that is retracted from the arc locus 71 a of the segment side frustoconical 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 attachment means such as screws (not shown).
Further, the segment side metal plate 73 can be made of a copper alloy, a surface-treated iron alloy such as soft nitriding, or other materials suitable for sliding.

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

Furthermore, in the present embodiment, the segment side guide flats arranged at the position facing the outer ring side guide flat surface 42 and the length L in the circumferential direction of the outer ring side guide flat surface 42 shown in FIG. The length N in the circumferential direction of the surface 72 is configured to be in a range of 40% to 60% of the length M in the circumferential direction of the outer surface of each segment 7. When the length is shorter than 40%, when the segments 7 are closed, the segments 7 cannot be stably pushed by the outer ring 4 and the postures are wobbled, and the segments 7 are opened. When a load is applied to move each segment 7 at a time, the segment side guide flat surface 72 and the outer ring side guide flat surface 42 cannot be brought into contact with each other. This is because the tire 30 is damaged. If the length exceeds 60%, the outer ring-side frustoconical inner surface 41 and the segment-side frustoconical outer surface 71 are in line contact with each other in a state just before reaching the closed position of the annular mold. This is because sufficient movement play 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 outer ring side guide flat surface 42” is a length connecting both ends of the outer ring side guide flat surface 42 (outer ring side metal plate 43) including the T-shaped block 11. It means that. In addition, “the length (width) N in the circumferential direction of the segment side guide flat surface 72” means the circumferential direction of a 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 the outer ends.

Operation | movement of the tire vulcanization mold apparatus which concerns on embodiment of this invention is demonstrated using FIGS.
As shown in FIG. 3, when the outer ring 4 is at the uppermost position, each segment 7 constituting the annular split mold is at the outermost side in the radial direction. As shown, the mold assembly is in its most open state.
In the state where the mold assembly shown in FIG. 5A is most opened, the outer ring 4 and each segment 7 are not in contact with each other. That is, the outer ring side frustoconical inner surface 41 and the outer ring side guide flat surface 42 are both separated from the segment side frustoconical outer surface 71 and the segment side guide flat surface 72.
The segments 7 are also separated from each other.
Of course, the outer ring 4 and each segment 7 are connected by the T-shaped block 11 and the T-shaped groove 13 in a loosely fitted state.

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. Accordingly, as shown in FIG. 5B, the outer ring side guide flat surface 42 eventually comes into contact (sliding contact) with the segment side guide flat surface 72 as shown in FIG.
On the other hand, the outer ring-side frustoconical inner side surface 41 is kept away from the segment 7 side, i.e., non-contact.
The outer ring side guide flat surface 42 abuts on the segment side guide flat surface 72, whereby the outer ring 4 starts to push the segments 7, and each segment 7 starts moving inward in the radial direction.
Since the pushing of the segment 7 by the outer ring 4 in this case is due to the surface contact between the guide flat surfaces 42 and 72, the posture of the segment 7 during the movement is stable and the peristalsis occurs even if the speed is increased. hard. That is, the segment 7 is prevented from hitting the outer ring 4 and being 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 set as the length in the circumferential direction of the outer surface of each segment 7. The outer ring side guide flat surface 42 and the segment side guide flat surface 72 have a certain length (width) by being configured to have a length within a range of 40% to 60% of the length M. It can be configured as a flat surface. Therefore, when the segments 7 are pushed by the outer ring 4, the segments can be pushed more stably by the outer ring 4, and the wobble of the posture can be further prevented.

  As the outer ring 4 is further lowered, each of the outer rings 4 in the state shown in FIG. 5B, that is, the outer ring side guide flat surface 42 is in contact with the segment side guide flat surface 72 for a while. The pushing of the segment 7 inward in the radial direction is continued.

When the outer ring 4 is lowered to the middle position before reaching the lowest position (closed position of each segment 7) of the outer ring 4 shown in FIG. Since the ring radius becomes smaller, the state shown in FIG.
That is, the outer ring 4 and each segment 7 are in contact with the outer ring-side guide flat surface 42 and the segment-side guide flat surface 72, as well as the outer ring-side frustoconical inner side surface 41 and the segment-side frustoconical shape. Line contact by the outer 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 both 42 and 72 are separated from each other. That is, the pushing of the segment side guide flat surface 72 by the outer ring side guide flat surface 42 is completed.
Instead, the outer ring-side frustoconical inner surface 41 is pushed by direct line contact with the segment-side frustoconical outer surface 71 to move each segment 7.
This pushing by the line contact between the outer ring side frustoconical inner side surface 41 and the segment side frustoconical outer side surface 71 continues to the closing position of the segment 7.

When the outer ring 4 is lowered to the lowest position shown in FIG. 4, as shown in FIG. 6 (b), each segment 7 reaches its closed position, and the assembly of the annular split mold is completed.
At the closed position of each segment 7 in which the assembly of the annular split mold is completed, the outer ring side truncated conical inner surface 41 and the segment side truncated conical outer surface 71 are in close contact with each other with the same radius of curvature. 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 are not in contact with each other and are separated from each other with a gap.

  In a state just before reaching the closing position, it is preferable that the outer ring side truncated conical inner surface 41 and the segment side truncated conical outer surface 71 be pushed by line contact. In the case of the line contact, movement of each segment 7 can be performed, so that the posture can be adjusted during that time. For this reason, 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. An accurate and precise annular division mold assembly with matching can be made.

When each segment 7 in the closed state is opened, 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 by the rising of the outer ring 4. Thus, the segment 7 is dragged radially outward.
At this time, in this 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. The segment side guide flat surface 72 and the outer ring are configured so that the segment 7 has a length within the range of 40% to 60%, even if a load that greatly moves the segment 7 is applied. The side guide flat surface 42 can be brought into contact with each other, and unnecessary movement of the segment 7 can be prevented. Therefore, by preventing the wobbling of the posture of the segment 7, it is possible to sufficiently reduce the damage and wear of the segment 7 due to unnecessary contact with and contact with the outer ring 4, and to reduce the number of repairs and extend the life. it can. Moreover, it can prevent that the segment 7 bites into the tire 30 which is a product, and can prevent that the edge part of the division surface of the tire 30 or the segment 7 arises.
The T-shaped block 11 is dimensioned so that it does not come into contact with any inner wall of the T-shaped groove 13 while the outer ring 4 is lowered downward.

In the present invention, when each segment 7 is pushed from the open position to the closed position by the lowering of the outer ring 4, the outer ring side guide flat surface 42 and the segment side guide flat surface are moved to the middle position before reaching the closed position. The surface contact with the outer ring side frustoconical inner surface 41 and the segment side frustoconical outer surface 71 is in direct line contact from the midway position to the closing position of the segment 7. It is configured to hold.
The “intermediate position” at which switching from the surface abutment to the line abutment by the outer ring 4 and the segment 7 is a position between the open position and the closed position. This “intermediate position” is the closed position. The closer it is to, there is an advantage that the mold assembly operation of the annular split mold can be performed quickly and stably. There is also an advantage that the segment 7 is hardly damaged. On the other hand, if the “intermediate position” is set so as to be too close to the closing position, the opportunity to adjust the final posture of each segment 7 is lost sufficiently, and the mold assembly may not be performed accurately. .
Therefore, the “intermediate position” in which the contact between the outer ring 4 and the segment 7 is changed from the surface contact to the line contact, the size of the radius of curvature of the annular split mold, the number of segments 7 divided, 7 when assembling the device, depending on the material, the moving speed of the segment 7, the length L of the outer ring side guide flat surface 42 in the circumferential direction, the length N of the segment side guide flat surface 72 in the circumferential direction, and other conditions. In addition, it is preferable to be able to make adjustments during trial operation after assembly, during subsequent repairs, and the like.

Referring to FIG. 7, the adjustment of the “intermediate position” can be performed on the outer ring 4 side by adjusting the advancing amount Q <b> 1 of the advancing position with respect to the circular arc locus 41 a of the outer ring side guide flat surface 42. .
Further, the adjustment of the “halfway position” can be performed on the segment 7 side by adjusting the retraction amount Q2 of the retreat 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 makes it easier to contact the segment side guide flat surface 72. On the other hand, it becomes difficult for the outer ring side frustoconical inner surface 41 and the segment side frustoconical outer surface 71 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 72 is long, and the contact between the outer ring side truncated conical inner surface 41 and the segment side truncated cone outer surface 71 is shortened. Thus, the “halfway position” is close to the closing position.
When the advance amount Q1 of the outer ring side guide flat surface 42 is reduced, the “halfway position” becomes far from the closed position.
Further, when the retraction amount Q2 of the segment side guide flat surface 72 is increased, it is difficult to make contact with the outer ring side guide flat surface 42. On the other hand, the outer ring side frustoconical inner side surface 41 and the segment side frustoconical outer side surface 71 are easily brought 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 frustoconical inner surface 41 and the segment side frustoconical outer surface 71 is long. Thus, the “halfway position” is far from the closed position.
When the retraction amount Q2 of the segment side guide flat surface 72 is reduced, the “halfway position” becomes closer to the closing position.

Adjustment of the advance amount Q1 of the outer ring side guide flat surface 42 is specifically performed by adjusting the thickness of the outer ring side metal plate 43 at the time of assembling the tire vulcanizing mold apparatus, at the time of trial operation after assembly, and at the subsequent repair. Can be adjusted.
Specifically, it can be performed by adjusting the size of the step S1 between the upper surface of the outer ring side metal plate 43 constituting the outer ring side guide flat surface 42 and the recess 44.
More specifically, it can be performed by adjusting the thickness of the outer ring side metal plate 43. The thickness adjustment of the outer ring side metal plate 43 having the step S1 can be performed by cutting the upper surface or the lower surface of the outer ring side metal plate 43. The outer ring side metal plate 43 can be replaced with a metal plate having a different thickness.
The outer ring side metal plate 43 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 retraction 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 vulcanizing mold apparatus, at the time of trial operation after assembly, and at the subsequent repairing. 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 midway position is adjusted mainly 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 attachment means such as screws (not shown). When the step is not provided, the segment side metal plate 73 is not necessarily provided. A 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 modification shown in FIG. 8, as a means for adjusting the advance amount Q1 of the outer ring-side guide flat surface 42, a plurality of outer ring-side metal plates 43 are provided so as to be increased or decreased. The advance amount Q1 can also be adjusted by changing the number of overlapping of the outer ring side metal plates 43.
In FIG. 8, the thickness adjustment by increasing / decreasing the number of the outer ring side metal plates 43 is performed by detaching the metal plate 43 and the T-shaped block 11 from the main body of the outer ring 4 with screws 10 and 12. After changing the number of 43, the screws 10 and 12 can be fixed again.
Further, in the modification shown in FIG. 8, as a means for adjusting the retraction amount Q2 of the segment side guide flat surface 72, the segment side metal plate 73 protrudes from the cut surface 75 with a step S2, and this protruding segment side metal plate 73 is provided. This can be done by scraping the upper surface or the lower surface. In this case, the segment side metal plate 73 is detachably attached to the main body of the segment 7 by attachment means such as screws (not shown).

Still another modification shown in FIG. 9 shows an example in which the mounting arrangement of the T-shaped block 11 and the T-shaped groove 13 is reversed. That is, a T-shaped groove 13 is formed on the outer ring 4 side, and a T-shaped block 11 is formed on the segment 7 side. In this case, the outer ring side metal plate 43 is divided to receive the T-shaped block 11. Therefore, in this case, a length P connecting both ends on the outer side in the circumferential direction of the pair of outer ring side guide flat surfaces 42 (outer ring side metal play 43) arranged with the T-shaped groove 13 interposed therebetween is set to each segment. 7 is configured to have a length in the range of 40% to 60% of the length M in the circumferential direction of the outer surface.
The same members and the same functions as those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted.

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

DESCRIPTION OF SYMBOLS 1 Tire vulcanizing mold apparatus 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-shaped block 12 Screw 13 T-shaped groove 14 Stopper 15 stopper groove 21 outer ring 21a frustoconical surface 21b T block 22 segment 22a frustoconical surface 22b T groove 30 tire 41 outer ring side frustoconical inner surface 41a circular locus 42 outer ring side guide flat Surface 43 External ring side metal plate 44 Recess 71 Segment side frustoconical outer surface 71a Circular 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 Advancing amount Q2 Retraction amount S1 Step S2 Step T Tapping 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 disposed radially outward of the plurality of segments, the outer ring being moved in one axial direction Thus, the outer ring pushes each segment inward in the radial direction to close the annular split mold, and moves the outer ring in a direction opposite to the one direction in the axial direction, thereby causing each segment to have a radius. A tire vulcanization mold apparatus configured to move outward in the direction and open the annular split mold,
The outer surface of each segment and the inner surface of the outer ring facing it are configured as a segment side frustoconical outer surface and an outer ring side frustoconical inner surface facing each other,
A part of each segment side frustoconical outer surface and a part of the outer ring side frustoconical inner surface constitute a segment side guide flat surface and an outer ring side guide flat surface facing each other. In addition, the length in the circumferential direction of the segment side guide flat surface and the outer ring side guide flat surface is a length within the range of 40% to 60% of the length in the circumferential direction of the outer side surface of each segment. Configured
In addition, the pushing of each segment by the outer ring pushes the outer ring side guide flat surface into contact with the segment side guide flat surface until the middle position just before reaching the closing position of each segment. And the outer ring side frustoconical inner surface instead of the contact between the outer ring side guide flat surface and the segment side guide flat surface from the midway position to the closing position of each segment. A tire vulcanization mold apparatus characterized in that is configured to directly abut against each segment side frustoconical outer surface and push.   Adjustable midway position to replace abutment by outer ring side frustoconical inner surface and segment side frustoconical outer surface from abutment by outer ring side guide flat surface and each segment side guide flat surface The tire vulcanization mold apparatus according to claim 1, wherein the tire vulcanization mold apparatus is configured as described above.   The segment side guide flat surface formed as a part of the segment side frustoconical outer surface retreats from the arc trajectory of the convex curved surface constituting the segment side frustoconical outer surface. The outer ring side guide flat surface configured to be disposed at a position and configured as a part of the outer ring side frustoconical inner surface has a guide flat surface that is different from the outer ring side frustoconical inner surface. The tire vulcanization mold apparatus according to claim 1, wherein the tire vulcanization mold apparatus is configured to be disposed at an advanced position that is advanced from an arc locus of the concave conical curved surface.   The tire vulcanized metal according to any one of claims 1 to 3, wherein either one or both of the segment side guide flat surface and the outer ring side guide flat surface is constituted by a detachable metal plate. Mold device.   The tire vulcanization mold apparatus according to claim 4, wherein the thickness of the metal plate can be adjusted by cutting or polymerization.   5. The tire vulcanization mold apparatus according to claim 4, wherein the metal plate is made of a copper alloy or a surface-treated iron alloy such as soft nitriding or other material suitable for sliding.

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