JP3191363U - Tire vulcanizing mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire vulcanization mold capable of effectively improving the accuracy of a mold during tire vulcanization by accurately operating a segment which is an annular split mold during tire vulcanization. do. SOLUTION: A plurality of segments 10 which are annular division molds for forming a tread portion of a tire, and a plurality of segments 10 are arranged outside the segments 10 and moved in the axial direction to open and close the plurality of segments 10 in the radial direction. A tire vulcanization mold having a flexible outer ring 4 and having a surface facing the segment 10 and the outer ring 4 as conical surfaces 21 and 4a, wherein the segment 10 and the outer ring 4 face each other. In addition to being loosely coupled to 4, a pair of guide flat surfaces 22, 4b that face each other in the axial direction and guide the segment 10 and the outer ring 4 to each other are provided on a part of the conical surface 21, 4a. It is a tire vulcanization mold provided. [Selection diagram] Fig. 5

Description

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

2. Description of the Related Art Conventionally, as a mold for molding an automobile tire, what is called a tire vulcanization mold for molding a tire while vulcanizing the tire is provided. The tire vulcanization mold 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, a mold made of a segment obtained by dividing the annular mold into a plurality of parts in the circumferential direction is often used.
As a tire vulcanization mold provided with such an annular mold composed of a plurality of segments, there is Patent Document 1 below.

JP 60-78711 A

The above Patent Document 1 is an invention related to a tire vulcanizer, and has an advantage that the radial dimension of the segment can be reduced and the outer dimensions of the vulcanizable tire can be increased.
However, in the conventional tire vulcanization mold as shown in Patent Document 1, the inner periphery of the outer ring that moves each segment in the radial direction is formed as a frustoconical surface, and the outer periphery of each segment is formed on the outer ring. It was common to form a frustoconical surface with the same gradient as the frustoconical surface.
Therefore, when the outer ring is lowered in the axial direction and each segment is moved radially inward until it comes into close contact with the upper and lower molds, the frustoconical surface of the outer ring and the wharf of each segment The conical surface is in full contact.
On the other hand, when the outer ring is pulled away from the segment in the axial direction and each segment is moved radially outward, the frustoconical surface has different curvature radii depending on the axial position. A gap is created between the outer ring and the frustoconical surface of the outer ring, and the outer ring and each segment are in line contact. As a result, local wear occurs on the outer ring and each segment, which causes a problem that the mold is easily damaged. Further, the posture of each segment collapses and smooth operation cannot be obtained. Further, since the movement is not constant, there is a problem that the core circularity of the mold is difficult to assemble during vulcanization and the mold is easily damaged.

  Therefore, the present invention solves the above-mentioned problems of the prior art, and can accurately operate the segment which is an annular split mold during tire vulcanization, thereby effectively improving the precision of the mold during tire vulcanization. An object is to provide a tire vulcanization mold that can be used.

  The tire vulcanization mold according to the present invention includes a plurality of segments that are annular division molds for forming a tread portion of a tire, and the plurality of segments that are disposed outside the segments and move in an axial direction. An outer ring that can be opened and closed in the radial direction, and a surface of the segment and the outer ring that are opposed to each other as a frustoconical surface. The outer ring and the outer ring are loosely coupled, and a pair of guide flat surfaces for guiding the segment and the outer ring to each other are provided in a part of the frustoconical surface so as to face each other in the axial direction. Is the first feature.

  Further, in the tire vulcanization mold according to the present invention, in addition to the first feature, the guide flat surface of the segment and / or the guide flat surface of the outer ring is formed of a detachable metal plate. This is the second feature.

  In the tire vulcanization mold according to the present invention, in addition to the second feature described above, the metal plate is made of a copper alloy or a surface-treated iron alloy such as a tafflide treatment, or other materials suitable for sliding. 3 features.

  According to the tire vulcanization mold according to the first aspect, by providing the guide flat surfaces in pairs, the segments and the outer ring can be guided to each other over a wide plane. Therefore, it is possible to effectively prevent the posture of each segment from collapsing when the segment is opened and closed, and the movement of the segment can be made constant. Accordingly, it is possible to effectively prevent the segment from being damaged. In addition, by adopting a configuration in which the segment and the outer ring are loosely coupled, the outer ring and the segment can be moved relative to each other with a play width when the segment is opened and closed, and a plurality of segments are In the closed state, the mold can be positioned by the circular shape (inner circumference) of the outer ring and the circular shape (outer circumference) of the segment. Therefore, the segments can be operated accurately during tire vulcanization, and the precision of the mold during tire vulcanization can be effectively improved.

  Moreover, according to the tire vulcanization mold according to claim 2, in addition to the function and effect of the configuration according to claim 1, the guide flat surface can be easily formed. Moreover, it is possible to easily replace only the guide flat surface.

  Moreover, according to the tire vulcanization mold according to claim 3, in addition to the function and effect of the configuration according to claim 2, a guide flat surface having sufficient strength can be formed. Therefore, damage to the guide flat surface can be effectively prevented. Moreover, it can be set as a guide flat surface with good sliding.

1 is a perspective view schematically showing a tire vulcanization mold according to an embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows the tire vulcanization metal mold | die which concerns on embodiment of this invention, (a) is a figure which shows the state before a type | mold assembly is made, (b) is a figure which shows the state after the type | mold assembly was made. is there. It is a longitudinal cross-sectional view of the principal part of the tire vulcanization mold 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 concerning an embodiment of the present invention, and is a figure showing the state after a die assembly was made. BRIEF DESCRIPTION OF THE DRAWINGS It is a horizontal sectional view of the principal part of the tire vulcanization mold concerning the embodiment of the present invention, (a) is a figure showing the state before a mold assembly is made, (b) is the state after a mold assembly is made. FIG. It is a horizontal sectional view of the important section in the modification of the tire vulcanization metallic mold concerning the embodiment of the present invention. It is a horizontal sectional view of the principal part showing the conventional tire vulcanization metallic mold, and is a figure showing the state before a die set is made.

  The tire vulcanization mold according to the present invention will be described with reference to the following drawings to provide an understanding of the present invention. However, the following description does not limit the invention described in the claims of the utility model registration of the present invention.

  First, a tire vulcanization mold 1 according to an embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, a tire vulcanizing mold 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 bolts (not shown) inside them. An upper mold 5, a lower mold 6, and an intermediate mold 7 for forming a tread portion of the tire are provided. Vulcanization molding of automobile tires is performed by an upper mold 5, a lower mold 6 and an intermediate mold 7 that form the tread portion.

Further, as shown in FIG. 2, the intermediate mold 7 includes a segment 10 divided into a plurality of segments.
As shown in FIG. 1, the segment 10 includes a slider 20 and a side mold 30.

As shown in FIGS. 2 to 4, when performing vulcanization molding, the outer ring 4 moves downward (in the axial direction) via a piston rod 50 of a cylinder (not shown), so that the slider 20 moves inward ( (Radial direction). As a result, as shown in FIG. 4, the side mold 30 moves inward (in the radial direction), and the plurality of segments 10 are closed to form a mold.
After the vulcanization molding is completed, the outer ring 4 moves upward (in the axial direction) via the piston rod 50 of a cylinder (not shown), so that the slider 20 moves outward (in the radial direction). As a result, as shown in FIG. 3, the side mold 30 moves outward (in the radial direction), the plurality of segments 10 are opened, and the mold assembly is released.

  Hereinafter, the structure and operation of the outer ring 4 and the segment 10 (slider 20 and side mold 30), which are main components of the present invention, will be described in more detail.

As shown in FIGS. 3 to 5, the slider 20 includes a frustoconical surface 21 that is tapered upward on a radially outer peripheral surface that is a surface facing the outer ring 4.
Further, a part of the frusto-conical surface 21 (circumferential center) is inclined with the same gradient as the frusto-conical surface 21, and the outer ring 4 is slidably guided so as to face the axial direction. A guide flat surface 22 is provided as a flat surface for this purpose.
The slider 20 can be made of, for example, iron or aluminum.
As shown in FIGS. 3 and 4, the slider 20 is provided with a rectangular metal plate 24 between the upper mold plate 2 and the lower mold plate 3. The metal plate 24 may be made of a copper alloy, a surface-treated iron alloy such as a taffle treatment, or other materials suitable for sliding.

Further, the outer ring 4 is provided with a frustoconical surface 4 a having the same gradient as the frustoconical surface 21 on the inner peripheral surface which is a surface facing the slider 20.
Further, a flat guide flat surface 4b is provided on a part of the frustoconical surface 4a (a position facing the guide flat surface 22) so as to oppose the slider 20 in sliding contact with the axial direction. is there.
Thus, in this embodiment, it is set as the structure which provides the guide flat surfaces 22 and 4b for guiding the slider 20 and the outer ring 4 mutually.
In the present embodiment, the guide flat surface 4b is formed by a rectangular metal plate 4c that is detachably attached to the outer ring 4. More specifically, as shown in FIG. 5A, a rectangular recess 4d is provided in the truncated conical surface 4a of the outer ring 4, and a rectangular metal plate 4c is attached to the recess 4d. A guide flat surface 4b is formed. At this time, the metal plate 4c is mounted so that the surface thereof is flush with the truncated conical surface 4a.
As shown in FIGS. 3 and 4, the metal plate 4c can be attached to the recess 4d using a countersunk screw 4e.
The outer ring 4 can be formed of iron or the like. Further, as the metal plate 4c, a copper alloy, a surface-treated iron alloy such as a taffle treatment, or other materials suitable for sliding can be used.

In this embodiment, the guide flat surface 22 of the slider 20 is provided with a T-shaped groove 23 having a T-shaped inclined section extending in the axial direction, and the T-shaped groove 23 has an external portion as shown in FIG. A T-shaped block 4f having a T-shaped cross section provided on the guide flat surface 4b of the ring 4 is slidably inserted.
The T-shaped groove 23 serving as the fitting concave portion and the T-shaped block 4f serving as the fitting convex portion constitute a joint T that loosely couples the segment 10 and the outer ring 4 together.
3 and 4, the T-shaped block 4f can be attached to the outer ring 4 via a bolt B.

Next, a specific operation when the tire vulcanizing operation is performed using the tire vulcanizing mold 1 having such a configuration will be described.
First, a raw tire (not shown) is carried into the mold.
3 and 4, the outer ring 4 is lowered in the axial direction via a piston rod 50 of a cylinder (not shown). At this time, the outer ring 4 descends along the T-shaped groove 23 with the frustoconical surface 4 a in sliding contact with the frustoconical surface 21. More specifically, as shown in FIG. 5A, the guide flat surface 4 b of the outer ring 4 is brought into sliding contact with the guide flat surface 22 of the slider 20 and lowered.
As the outer ring 4 is lowered, the side mold 30 moves inward in the radial direction.
As shown in FIG. 4, when the outer ring 4 is lowered to the lowest position, the side mold 30 comes into close contact with the upper mold 5 and the lower mold 6. As a result, the plurality of segments 10 are closed to form a mold, and a vulcanization space K for vulcanizing the tire is formed inside the mold. At this time, since the outer ring 4 and the slider 20 are loosely coupled to each other via the joint T, a small amount is provided between the guide flat surface 4b and the guide flat surface 22 as shown in FIG. A gap S is formed, and between the adjacent sliders 20, the truncated conical surface 4a (the inner periphery of the outer ring 4) and the truncated conical surface 21 (the outer periphery of the slider 20) are in close contact.
When the vulcanization of the tire is completed, the outer ring 4 is raised in the axial direction via the piston rod 50 of a cylinder (not shown) with reference to FIGS. At this time, the outer ring 4 rises along the T-shaped groove 23 with the frustoconical surface 4 a in sliding contact with the frustoconical surface 21. More specifically, as shown in FIG. 5A, the guide flat surface 4 b of the outer ring 4 is brought into sliding contact with the guide flat surface 22 of the slider 20 and is raised.
As the outer ring 4 is raised, the side mold 30 moves outward in the radial direction. As a result, the plurality of segments 10 are opened and the mold set is solved.
Then, after raising the outer ring 4 to the highest position, the tire is taken out from the mold.
This completes the tire vulcanization operation.

  The tire vulcanization mold 1 according to the present embodiment having such a configuration has the following effects.

The guide flat surface 22 and the guide flat surface 4b are provided as a pair, and when the plurality of segments 10 are opened and closed, the guide flat surface 22 and the guide flat surface 4b are brought into sliding contact with each other to move the outer ring 4 in the axial direction. By adopting a configuration in which 20 is moved in the radial direction, the slider 20 (segment 10) and the outer ring 4 can be brought into sliding contact with each other on a wide plane during sliding.
Therefore, the pressure applied to the center of the slider 20 during vulcanization can be transmitted in a plane, and the movement of the slider 20 can be made constant. Therefore, it is possible to effectively prevent the posture of each segment 10 from being collapsed when the segment 10 is opened and closed. Therefore, damage to the segment 10 can be effectively prevented.
In addition, by adopting a structure in which the segment 10 and the outer ring 4 are loosely coupled, the outer ring 4 and the segment 10 can be moved relative to each other with a play width when the segment 10 is opened and closed. In a state where the plurality of segments 10 are closed, the mold can be positioned by the circular shape (inner circumference) of the outer ring 4 and the circular shape (outer circumference) of the segment 10 (slider 20). Therefore, the segment 10 can be accurately operated during tire vulcanization, and the accuracy of the mold during tire vulcanization can be effectively improved.

  Further, by providing the guide flat surface 4b, it is possible to effectively increase the area of the attachment portion of the T-type block 4f. Therefore, the T-type block 4f can be firmly attached.

  Further, the guide flat surface 4b can be easily formed by forming the guide flat surface 4b with a detachable rectangular metal plate 4c. Further, only the guide flat surface 4b can be easily replaced, and the tire vulcanization mold 1 having excellent durability can be obtained.

  Moreover, the guide flat surface 4b provided with sufficient intensity | strength can be formed by setting it as the structure which uses the iron alloy by which surface treatment, such as a copper alloy or a taffle treatment, and the other material suitable for sliding is used as the metal plate 4c. Therefore, the guide flat surface 4b can be effectively prevented from being damaged. Moreover, it can be set as the guidance flat surface 4b with a sufficient slip.

On the other hand, as shown in FIG. 7, the conventional tire vulcanizing mold 100 has an inner periphery of the outer ring 40 that moves each slider 200 (segment) in the radial direction as a truncated conical surface 40a. In general, the outer periphery of each slider 200 is formed as a frustoconical surface 210 having the same gradient as the frustoconical surface 40 a of the outer ring 40.
Therefore, when the outer ring 40 is lowered in the axial direction and moved inward in the radial direction until the sliders 200 are in close contact with the upper mold (not shown) and the lower mold (not shown), The frustoconical surface 40a and the frustoconical surface 210 of each slider 200 are in full contact.
On the other hand, when the outer ring 40 is pulled away from the slider 200 in the axial direction and each slider 200 is moved radially outward, the frustoconical surface 40a and the frustoconical surface 210 have different radii of curvature depending on the axial positions. Therefore, a gap is generated between the circumferential ends of each slider 200 and the frustoconical surface 40a of the outer ring 40, and the outer ring 40 and each slider 200 are in line contact or point contact. As a result, local wear occurs on the outer ring 40 and each slider 200, which causes a problem that the mold is easily damaged. Further, the posture of each slider 200 collapses (causes rattling), and a smooth operation cannot be obtained. Also, since the movement is not constant, it is difficult to assemble the core degree of the mold during vulcanization, and the mold is easily damaged. There was a problem.

  Therefore, by adopting the configuration of the present invention, the segment 10 which is an annular split mold can be accurately operated during tire vulcanization. Therefore, the precision of the metal mold | die at the time of tire vulcanization can be improved effectively.

  Next, modified examples 1 and 2 of the tire vulcanization mold according to the embodiment of the present invention will be described with reference to FIG.

First, a first modification will be described with reference to FIG.
The first modification is different from the above-described embodiment only in the configuration of the guide flat surface 22 provided on the slider 20. Therefore, the same members and the same functions as those of the embodiment of the present invention described above are denoted by the same reference numerals, and the following detailed description is omitted.

Specifically, as shown in FIG. 6A, the guide flat surface 22 of the slider 20 is formed by a rectangular metal plate 24.
In the first modification, a recess 25 is formed in a portion of the frustoconical surface 21 of the slider 20 that faces the guide flat surface 4b of the outer ring 4, and a countersunk screw 26 is provided in the recess 25. A rectangular metal plate 24 is detachably attached. At this time, the metal plate 24 is mounted so that the surface thereof is flush with the truncated conical surface 21.

With such a configuration, even when the slider 20 is formed of a metal material having low strength such as aluminum, it is possible to effectively prevent the slider 20 from being damaged.
Further, only the guide flat surface 22 can be replaced, and the tire vulcanization mold 1 having excellent durability can be obtained.

  Next, referring to FIG. 6B, the present modification 2 is different from the above-described embodiment in the configuration of the guide flat surface 22 provided on the slider 20, the guide flat surface 4 b provided on the outer ring 4, and the joint T. Only a different configuration is used. Accordingly, the same members and the same functions as those of the above-described embodiment are denoted by the same reference numerals, and the following detailed description is omitted.

Specifically, as shown in FIG. 6B, the guide flat surface 22 of the slider 20 is formed by a rectangular metal plate 24.
In the second modification, a recess 27 is formed in a portion of the frustoconical surface 21 of the slider 20 facing the guide flat surface 4b of the outer ring 4, and a rectangular shape is formed in the recess 27 via a bolt B. A shaped metal plate 24 is detachably attached. At this time, the metal plate 24 is mounted so that the surface thereof is flush with the truncated conical surface 21.
Further, a T-shaped block 28 having a T-shaped cross section is provided on the slider 20 via a bolt B.
On the other hand, a flat guide flat surface 4 b is provided in a portion of the outer ring 4 facing the guide flat surface 22. Further, an inclined T-shaped groove 4g extending in the axial direction is provided at the center in the circumferential direction of the guide flat surface 4b, and a T-shaped block 28 provided on the guide flat surface 22 of the slider 20 in the T-shaped groove 4g. Is slidably inserted.
The T-shaped groove 4g and the T-shaped block 28 constitute a joint T that loosely couples the segment 10 and the outer ring 4.
Such a configuration is also included in the scope of the present invention. That is, the T-shaped groove and the T-shaped block constituting the joint may be provided on either the slider 20 or the outer ring 4.

  In addition, the radial thickness of the rectangular metal plate constituting the guide flat surfaces 22 and 4b can be changed as appropriate. In the present embodiment, the fitting concave portion is formed by a T-shaped groove and the fitting convex portion is formed by a T-shaped block. The shapes of the fitting concave portion and the fitting convex portion provided on the slider 20 can be appropriately changed.

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

DESCRIPTION OF SYMBOLS 1 Tire vulcanization mold 2 Upper mold plate 3 Lower mold plate 4 External ring 4a Frustum cone surface 4b Flat guide surface 4c Metal plate 4d Recess 4e Countersunk screw 4f T block 4g T mold groove 5 Upper mold 6 Lower mold Mold 7 Intermediate mold 10 Segment 20 Slider 21 Frustum cone surface 22 Guide flat surface 23 T-shaped groove 24 Metal plate 25 Recess 26 Countersunk screw 27 Recess 28 T-shaped block 30 Side mold 40 External ring 40a Frustum cone surface 40d T-shaped block 50 Piston rod 100 Tire vulcanization mold 200 Slider 210 Frustum cone surface 230 T-shaped groove B Bolt K Vulcanization space S Clearance T Joint

Claims (3)

  A plurality of segments that are annular division molds for forming a tread portion of a tire, and an outer ring that is disposed outside the segments and that can be opened and closed in the radial direction by moving in the axial direction A vulcanizing mold in which the surfaces of the segment and the outer ring facing each other are configured as frustoconical surfaces, and the segment and the outer ring are loosely coupled to each other. In addition, a tire vulcanization mold, wherein a pair of guide flat surfaces for guiding the segment and the outer ring to each other are provided on a part of the frustoconical surface so as to face each other in the axial direction.   The tire vulcanization mold according to claim 1, wherein the guide flat surface of the segment and / or the guide flat surface of the outer ring is formed of a detachable metal plate.   3. The tire vulcanization mold according to claim 2, wherein the metal plate is made of a copper alloy or a surface-treated iron alloy such as a tafflide treatment, or other material suitable for sliding.

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