JP2000334740A - Segment drive apparatus and method for tire mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a segment drive apparatus and method for a tire mold capable of eliminating such a phenomenon that a green tire is put between segments to prevent the generation of flashing, extending the life of a tire mold and capable of enhancing the quality of a tire and productivity while achieving cost reduction. SOLUTION: In a segment drive apparatus of a tire mold constituted so as to move a plurality of segments, which are divided in a peripheral direction, in a diameter direction to open and close a tread mold 8 of an inner peripheral surface, a plurality of the segments are divided into two groups of first and second segments 11, 12 different in kind and these first and second segments are alternately arranged on the side of a lower mold 7 in a non-lifted state and drive cylinders 20 are provided in relation to the first and second segments 11, 12 and the first segments 11 are moved prior to the second segments 12 by the drive cylinders 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving apparatus and a driving method for a segment forming a container of a tire mold.

[0002]

2. Description of the Related Art Conventionally, a tire vulcanizer as shown in FIG. 9 has a base frame 51 disposed on a lower side, and a lower heat plate 53 bolted to the base frame 51 via a heat insulating plate 52. , A central mechanism 54 for bladder operation incorporated inside the lower heating plate 53, a bolster plate 55 assembled upwardly and vertically, and a bolster plate 5
5 is provided with an upper heating plate 57 which is bolted via an insulating plate 56. The tire vulcanizer incorporates a tire mold 60 for vulcanizing the tire T. The tire mold 60 is a split mold in which a tread mold portion is divided into a plurality in the circumferential direction, is housed and arranged in a container 61, and includes an upper mold 62, a lower mold 63, and a tread mold 64. Have been.

[0003] The container 61 has a bottom plate 65 bolted to the lower hot plate 53 and a top plate 66.
Is mounted on the top plate 66 via a guide member (not shown) so as to be movable in the radial direction.
5 has a plurality of (for example, 12) segments 67 slidably in contact with each other, and an inner inclined surface engaged with an outer inclined surface of the segment 67, and is relative to the segment 67 via a guide member (not shown). The upper hot plate 57
And an outer ring 68 bolted to the outer ring. The upper mold 62 is bolted to the top plate 66, the lower mold 63 is bolted to the bottom plate 65, and the tread mold 64 is fixed to the inner peripheral surface of the segment 67. A hydraulic cylinder 71 for opening and closing the container is attached to the bolster plate 55 via a bracket 69 and a flange 70, and the tip of a piston rod 71 a of the hydraulic cylinder 71 is connected to a top plate 66 via a flange 72. The tread mold 64 is opened and closed by the operation of the hydraulic cylinder 71.

That is, when the bolster plate 55 is raised by extending the piston rod 71a of the hydraulic cylinder 71, the outer ring is formed by the bolster plate 55 while the segment 67 is pressed against the bottom plate 65 via the top plate 66. When the top plate 66 and the upper heating plate 57 are separated from each other, the segments 67 are moved radially outward by the guide action of the outer ring 68, and the tread mold 64 is opened. When the bolster plate 55 is further raised, the upper mold 62 and the segment 67 are moved to the top plate 6.
6 and is suspended by the flange 72, rises while leaving the bottom plate 65 and the lower mold 63, and the tire mold 60 is opened. On the other hand, when closing the tire mold 60, when the bolster plate 55 is lowered while the piston rod 71a of the hydraulic cylinder 71 is kept in the extended state, the lower surface of the enlarged segment 67 contacts the bottom plate 65, and the piston While the rod 71a is being pushed back, the operation is reversed, and the tire mold 60 is closed.

[0005]

However, in the above-described conventional tire mold 60, a plurality of (for example, 12) segments 67 constituting the container 61 are simultaneously moved by one hydraulic cylinder 71 so as to be tread. Type 64
, The green tire (raw tire) is sandwiched between the segments 67, and there is a problem that large flushing (rubbing of rubber) occurs. When such flushing occurs, the life of the tire mold 60 may be shortened. Therefore, an operation process for removing the flushing is required, which may lead to an increase in cost and a decrease in productivity.

The present invention has been made in view of such circumstances, and has as its object to eliminate the occurrence of flushing by eliminating the pinching of a raw tire between segments, to extend the life of a tire die, It is an object of the present invention to provide a segment driving device and a segment driving method for a tire mold capable of improving the quality, cost and productivity of the tire mold.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention is directed to an outer ring and a segment that constitute a container of a tire mold are engaged with each other, and the outer ring is moved up and down. In the tire mold segment driving device for opening and closing the tread mold portion provided on the inner circumferential surface by moving a plurality of segments divided in the circumferential direction by a guiding action accompanying the Are divided into two groups, a first segment and a second segment, which are different from each other.
The segments are alternately arranged on the lower mold side without being moved up and down, and a driving cylinder is provided in association with the first segment and the second segment, and the first segment is moved by the driving cylinder to the second segment. Is moved ahead of it.

In another aspect of the present invention, there is provided a tire mold container in which an outer ring and a segment are engaged with each other, and a plurality of circumferentially divided outer rings are guided by an up and down movement of the outer ring. In a tire mold segment driving method for opening and closing a tread portion provided on an inner peripheral surface by moving a segment in a radial direction, a first segment and a second segment in which the plurality of segments are divided into two types of groups. Are alternately arranged on the lower mold side in a state in which the first segment and the second segment are not raised and lowered, and the outer ring is raised while leaving the first segment and the second segment on the lower mold side. Disengage the engagement with the outer ring, and then move the first segment and the second segment continuously or intermittently in the radial direction. Are controlled to reach the closed position of the tread mold portion said first segment always precedes the second segment.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments. Here, FIGS. 1 to 5 are sectional views showing the operation of the segment driving device for a tire mold according to the embodiment of the present invention and the positional relationship between the segments in the order of steps, and FIGS. FIG. 8 is a plan view showing a state in which a driving cylinder of the segment driving device is provided in each segment, and lines XX in FIGS. 3 shows a movement guide surface of a container.

A tire mold 1 and a container 2 for accommodating the same according to an embodiment of the present invention are, as shown in FIGS. 1 to 5, a moving mold type which is carried into a mold opening / closing station after tire vulcanization. In the mold opening / closing station, there is provided a central mechanism driving section fixed to a base (not shown), and heating and pressurization supplied to the inside of the tire T via a bladder B near the periphery of the central mechanism driving section. A conduit attachment / detachment device for the medium is provided. A support (not shown) is provided on the base, and a bolster plate 3 is attached to the support via a guide device (not shown) so as to be able to move up and down. The bolster plate 3 is provided with a top plate lifting cylinder 4 used to open and close the container 2. A guide roller 5 for transferring the tire mold 1 and the container 2 is rotatably mounted on the base.

The tire mold 1 is a split mold in which a tread mold portion is divided into a plurality in the circumferential direction, and is housed and arranged in a container 2 as in the prior art. 7 and a tread mold 8. Further, the container 2 is provided with a base plate 9 disposed on the lower side.
And a plurality of top plates 10 disposed on the lower surface of the bolster plate 3 on the upper side and a plurality of (for example, mounted on the upper surface of the base plate 9 via grooves (not shown) and movably mounted in the radial direction. 6), the first and second segments 11 and 12 having different types, and the first and second segments 11 and 12 having different types.
The bolster plate 3 has an inner inclined surface that engages with the outer inclined surface of the segment 11, 12 and is slidable relative to the first and second segments 11, 12 via a guide member (not shown). The outer ring 13 is fastened.

The upper die 6 is bolted to the top plate 10, the lower die 7 is bolted to the base plate 9, and the tread die 8 is provided with the first and second segments 11, 12.
Are fixed to the respective inner peripheral surfaces of the inner and outer surfaces. Also, top plate 1
Numeral 0 is detachably connected to the piston rod of the top plate lifting cylinder 4 and is configured to be moved up and down by the top plate lifting cylinder 4 to move the upper die 6 up and down when the tire die 1 is opened and closed. ing. on the other hand,
A pair of rails 14 that engage with the guide rollers 5 are fixed to the lower surface of the base plate 9.

The first and second segments 11, 12
Belong to two groups of different types, and as shown in FIGS. 6 and 7, they are alternately arranged along the circumferential direction without moving up and down on the base plate 9 on the lower mold 7 side. ing. First and second segments 11, 1
On the inner peripheral surface side of 2, upper and lower portions of the tread mold 8 are formed with concave and convex portions 18 and 19 to be fitted with concave and convex portions 16 and 17 provided on the outer peripheral surfaces of the top plate 10 and the base plate 9 respectively. The fitting makes the mold clamping of the tire mold 1 strong. Moreover, the first segment 1
The left and right sides of the first segment 12 are formed in a radial shape that expands outward in plan view, and the left and right sides of the second segment 12 are formed in parallel shapes parallel to each other in plan view. The first segment 11 and the second segment 12 adjacent to each other are smoothly slid and arranged at predetermined positions.

The drive cylinders 20 constituting the segment drive device according to the embodiment of the present invention are provided, for example, at twelve in relation to the first and second segments 11 and 12 at intervals along the circumferential direction. Have been. In other words, the driving cylinder 20 includes the first and second segments 11 and 12.
And the first and second segments 11, 12 can be individually moved. In addition, these drive cylinders 20 can be freely moved ahead of the second segment 12, that is, with a time lag by operating a number of solenoid valves and the like by a speed controller (not shown). Is controlled as follows. For this purpose, the driving cylinder 20 includes a reciprocally operable rod 21 having a hook portion 21a provided at a tip thereof.
Connects the hook portion 21a to the first and second segments 11, 1
The first and second segments 11 and 12 are configured to move in the radial direction by engaging with a concave portion 22 provided at the lower rear end of the second segment 2.

As shown in FIGS. 1 and 8, the driving cylinder 20 is provided on the bolster plate 3 side on which the outer ring 13 is mounted. For this reason, a welding structure 25 composed of a rib 23, a ring-shaped plate 24, and the like is suspended outside the lower surface of the bolster plate 3,
The outer surface of the bolster plate 3 and the welded structure 2
The upper and lower ends of a plurality of (four in the present embodiment) lifting cylinders 26 are attached to the reference numeral 5 at regular intervals in the circumferential direction. A ring-shaped support bracket 27 on which the driving cylinder 20 is fixed and placed is disposed below the welding structure 25.
Is suspended by being connected to the distal end of a piston rod 26a of a lifting cylinder 26, and is raised and lowered. Therefore, the driving cylinder 20 is moved by the lifting cylinder 26 via the support bracket 27 in a state where the engagement between the outer ring 13 and the first and second segments 11 and 12 due to the lifting of the bolster plate 3 is released. The hook portion 21a of the operating rod 21 is lowered, and the concave portions 2 of the first and second segments 11 and 12 respectively.
2, the first and second segments 11 and 12 are moved.

On the base plate 9 side, there is provided a center mechanism operating section 28 driven by the above-mentioned center mechanism driving section (not shown). This center mechanism operation unit 28
An outer cylinder 29 suspended from the base plate 9;
An inner cylinder 30 inserted and arranged on the inner periphery of the inner cylinder 30 so as to be able to move up and down, a center post 31 inserted and arranged inside the inner cylinder 30 so as to be able to move up and down, and a nozzle which is bolted to the outside of the upper end of the inner cylinder 30 A member 32, a spacer rod 33 and a heating / pressurizing medium introduction pipe 34 fixed to the lower surface of the nozzle member 32, and a lower flange 35 fixed to the upper surface side of the nozzle member 32 to sandwich the lower end opening of the bladder B And an upper flange 36 for holding the upper end opening of the bladder B, and a fixture 37 for connecting the upper flange 36 and the center post 31. In addition, loading of unvulcanized tires and vulcanized tires T
1 is carried out by a raw tire loading / unloading device 39 having a chucking means 38 as shown in FIG.

Next, the operation of the segment driving device according to the embodiment of the present invention and the segment driving method will be described. FIG. 1 shows a state after the tire mold 1 and the container 2 have been transferred to the mold opening / closing station. The bolster plate 3 is raised, and accordingly, the upper mold 6, the outer ring 13 and the driving cylinder 20 rises while leaving the first and second segments 11 and 12 on the base plate 9 on the lower mold 7 side, and the first and second segments 11 and 12 disengaged from the outer ring 13. The tread mold 8 also moves outward in the radial direction and also separates from the vulcanized tire T, and the tire mold 1 in the container 2 is open. When the tire mold 1 is completely opened, the inside of the bladder B is set to a negative pressure, and the lower flange 35 for holding the end of the bladder B is held.
After the bladder B is extended and pulled out from the inside of the vulcanized tire T, the chucking means 38 of the raw tire loading or unloading device 39
The vulcanized tire T is peeled off from the lower mold 7 and lifted, and the raw tire to be vulcanized next is lifted by the chucking means 38 of the raw tire loading / unloading device 39.

When the suspension of the raw tires is completed, bladder B
While supplying steam or inert gas at a slight pressure (commonly referred to as primary shaping pressure) into the inside of the bladder B, the flanges 35 and 36 sandwiching the end of the bladder B are approached so as to be equal to the bead interval of the raw tire, The bladder B is inserted inside the tire to expand the diameter. After the bladder B is inserted, as shown in FIG. 2, the bolster plate 3 is lowered to the intermediate position and stopped, and the upper die 6 is lowered by the top plate lifting / lowering cylinder 4 via the top plate 10. The drive cylinder 20 is lowered by the lifting cylinder 26 via the support bracket 27 while the mold part is closed until it comes into contact with the raw tire. And the driving cylinder 2
The hook portions 21a of the zero operation rod 21 are engaged with and connected to the recesses 22 of the first and second segments 11, 12, respectively.

In this state, the operating rod 21 of the driving cylinder 20 is driven to move the first and second segments 11 and 12 continuously or intermittently in the radial direction on the raw tire side as shown in FIG. While moving, the first segment 11 is controlled to reach the closed position of the tread die 8 always ahead of the second segment 12, and the tread die 8 is moved until the inner peripheral portion thereof comes into contact with the raw tire. close. Then, the pressure inside the bladder B is increased to a low pressure (commonly referred to as a secondary shaping pressure), and a well-known shaping performed while closing the container 2 and the tire mold 1 is performed. When the tire mold 1 is closed,
As shown in FIG. 4, the bolster plate 3 is lowered, and the inner inclined surface of the outer ring 13 is engaged with the outer inclined surfaces of the first and second segments 11, 12, and the first and second segments 11 are guided by the guiding action. , 12 are further moved in the radial direction to lock the container 2. Further, the piston rod of the hydraulic cylinder 15 is engaged with the base plate 9 to perform mold clamping.

Thereafter, as shown in FIG. 5, the lock between the top plate lifting / lowering cylinder 4 and the container 2 is released, and the connection between the operating rod 21 of the driving cylinder 20 and the first and second segments 11, 12 is released. Then, when the bolster plate 3 is raised, the preparation for moving the tire mold 1 and the container 2 is completed. Thereafter, the tire mold 1 and the container 2 are transferred to a vulcanization station, where a high-temperature, high-pressure pressurized heating medium is supplied into the green tire via the bladder B at the vulcanization station, and the vulcanization process is started. . When the vulcanization process starts, the pipe attaching / detaching device (not shown) is lowered to disconnect the center mechanism driving unit (not shown) from the center post 31 of the center mechanism operating unit 28. During this time, as shown in FIG. 5, the tire mold 1 and the container 2 for taking out the vulcanized tire T next
Transfer and accept.

Next, as shown in FIG. 4, the bolster plate 3 is lowered to lock the piston rod of the top plate lifting / lowering cylinder 4 and the top plate 10 of the container 2, and the operating rod 21 of the driving cylinder 20
Hook portion 21a and first and second segments 11, 12
Is connected to the concave portion 22. Then, as shown in FIG. 3, the first and second segments 11, 12 and the driving cylinder 20
Bolster plate 3 while leaving
To the intermediate position, and the first and second segments 1
The engagement between the outer rings 13 and 1 and 12 is released. In this state, the operating rod 21 of the driving cylinder 20 is driven as shown in FIG.
The tread die 8 is opened by moving the tires 1 and 12 in the radial direction opposite to the vulcanized tire T. Thereafter, the same operation as the procedure shown in FIG. 1 is repeated to take out the vulcanized tire T.

The segment driving device and the segment driving method for the tire mold 1 according to the embodiment of the present invention are the same as those of the first and second, except that the segments constituting the container 2 are of different types.
Divided into two groups, segments 11 and 12,
The segments 11 and the second segments 12 are alternately arranged on the base plate 9 on the lower mold 7 side in a state where the segments 11 and the second segments 12 are not moved up and down, and the driving cylinders 20 are respectively corresponding to the first and second segments 11 and 12. Bolster plate 3
The first and second segments 11 and 12 are lifted up and down via a support bracket 27 and the like, and the first and second segments 11 and 12 are raised by leaving the first and second segments 11 and 12 on the base plate 9 side. The engagement with the outer ring 13 is released, and the first and second segments 1 are released.
Since the first segment 11 always reaches the closed position of the tread mold 8 ahead of the second segment 12 while moving the first and second segments 12 continuously or intermittently in the radial direction, each segment 11 , 12 can prevent the occurrence of large flushing, and the life of the tire mold 1 can be extended. Therefore, the flushing removal operation is not required, and the productivity can be improved. Further, in the segment driving device of the present embodiment, even if the first and second segments 11 and 12 are slightly shifted, the driving cylinder 20 is connected to each of the segments 11 and 12.
And the first and second segments 1
The movement of the tires 1 and 12 can be controlled freely, the opening and closing operation of the tire mold 1 can be performed smoothly, and the quality of the vulcanized tire T can be improved.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications and changes may be made without departing from the spirit of the present invention. What you get. For example, in the above-described embodiment, the driving cylinder 20 is provided corresponding to each of the first and second segments 11 and 12, so that the first and second segments 11 and 12 can be individually moved. However, one driving cylinder 20 is provided corresponding to each of the first and second segments 11 and 12, and the group of the first segment 11 and the group of the second segment 12 are linked via a link mechanism or the like. You may comprise so that it may be moved for every group. In addition, the segment driving device and the segment driving method of the present invention are applied to a moving mold type, but may be applied to a fixed type tire mold and container.

[0024]

As described above, the segment driving apparatus for a tire mold according to the present invention engages the outer ring and the segment constituting the container of the tire mold with each other, and guides the outer ring in accordance with the vertical movement of the outer ring. By operation, a plurality of segments divided in a circumferential direction are moved in a radial direction to open and close a tread-shaped portion provided on an inner peripheral surface, and the plurality of segments are different from each other in a first segment and a second segment. The first segment and the second segment are divided into two groups, and the first segment and the second segment are alternately arranged on the lower mold side without moving up and down, and a driving cylinder is associated with the first segment and the second segment. Since the first segment is moved ahead of the second segment by the driving cylinder, the raw tire is sandwiched between the segments. It is possible to eliminate only, it is possible to prevent the occurrence of flashing, extends the life of the tire mold, improve the quality of the tire, it is possible to improve the cost and productivity.

Further, in the method for driving a segment of a tire mold according to the present invention, the outer ring and the segment constituting the container of the tire mold are engaged with each other, and the outer ring is guided by the vertical movement of the outer ring. A plurality of segments divided in two directions, which are moved in the radial direction to open and close a tread-shaped portion provided on an inner peripheral surface, wherein the plurality of segments are divided into two types of first segments; The second segment and the second segment are alternately arranged on the lower mold side without being raised and lowered, and the first segment and the second segment are raised by leaving the first segment and the second segment on the lower mold side and raising the outer ring. Disengaging the two segments from the outer ring, and then moving the first segment and the second segment continuously or intermittently in the radial direction. However, since the first segment is always controlled to reach the closed position of the tread mold portion ahead of the second segment, the same effect as the above invention can be obtained, and the first and second segments can be obtained. The segments can be moved quickly, freely and reliably.

[Brief description of the drawings]

FIG. 1 is a sectional view of a tire mold segment drive device according to an embodiment of the present invention, showing a state in which a bolster plate and a drive cylinder are raised and first and second segments are open. .

FIG. 2 is a cross-sectional view showing a state in which the bolster plate stops descending at an intermediate position and first and second segments are opened by a driving cylinder.

FIG. 3 is a cross-sectional view showing a state in which the bolster plate stops descending at an intermediate position and first and second segments are closed by a driving cylinder.

FIG. 4 is a sectional view showing a state in which the tire mold is fully closed.

FIG. 5 is a cross-sectional view showing a state in which the bolster plate and the driving cylinder are raised, and preparation for moving the tire mold and the container is completed.

FIG. 6 is a plan view showing a state where the first segment is fully closed and the second segment is fully open, and a right side in the figure is a plan view showing a state where the first and second segments are fully closed.

FIG. 7 is a plan view showing a state where the first and second segments are half open, and a right side in the figure is a plan view showing a state where the first and second segments are fully open.

FIG. 8 is a plan view showing a state where drive cylinders provided in each of the first and second segments are arranged along a circumferential direction.

FIG. 9 is a sectional view showing a conventional tire mold segment driving device.

[Explanation of symbols]

 Reference Signs List 1 tire mold 2 container 3 bolster plate 4 top plate lifting cylinder 6 upper mold 7 lower mold 8 tread mold 9 base plate 10 top plate 11 first segment 12 second segment 13 outer ring 20 driving cylinder 21 operating rod 21a hook Part 22 Concave part 25 Welded structure 26 Elevating cylinder 27 Support bracket 39 Raw tire loading or unloading device T Vulcanized tire

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F202 AH20 AM32 CA21 CB01 CU03 CX04 CX06 CY02 CY21 4F203 AH20 AM32 DA11 DB01 DC02 DL10

Claims (6)

[Claims] An outer ring and a segment constituting a container of a tire mold are engaged with each other, and a plurality of segments divided in a circumferential direction are moved in a radial direction by a guiding action accompanying the vertical movement of the outer ring. In the tire mold segment driving device for opening and closing the tread mold portion provided on the inner peripheral surface, the plurality of segments are divided into two groups of a first segment and a second segment of different types. And the second segment are alternately arranged on the lower mold side without lifting and lowering, and a driving cylinder is provided in association with the first segment and the second segment, and the first segment is moved by the driving cylinder. A segment drive device for a tire mold, wherein the segment drive device is moved prior to the second segment. 2. The driving cylinder is provided so as to correspond to each of the first segment and the second segment, and is configured such that the first segment and the second segment can move individually. The segment drive device for a tire mold according to claim 1. 3. The driving cylinder is provided corresponding to each group of the first segment and the second segment.
The tire mold segment drive device according to claim 1, wherein the group of segments is configured to move for each group. 4. The drive cylinder is provided on a bolster plate side on which the outer ring is mounted, and the bolster plate is provided with a lift cylinder for lifting and lowering the drive cylinder. In a state where the engagement between the outer ring and the first segment and the second segment is released, the operating rod of the driving cylinder lowered by the lifting cylinder is attached to the first segment and the second segment. The segment driving device for a tire mold according to any one of claims 1 to 3, wherein the first segment and the second segment are configured to be moved by being locked and operated. . 5. The left and right sides of the first segment are formed in a radial shape that expands outward, and the left and right sides of the second segment are formed in a parallel shape parallel to each other. The tire mold segment drive device according to claim 1. 6. An outer ring and a segment constituting a container of a tire mold are engaged with each other, and a plurality of segments divided in a circumferential direction are moved in a radial direction by a guiding action accompanying the vertical movement of the outer ring. In the tire mold segment driving method for opening and closing a tread mold portion provided on an inner peripheral surface, the plurality of segments are divided into two types of groups, and a first segment and a second segment are not moved up and down. Alternately arranged on the lower mold side, the first
By lifting the outer ring while leaving the segment and the second segment on the lower mold side, the engagement between the first segment and the second segment and the outer ring is released, and then the first segment and the second While moving the two segments continuously or intermittently in the radial direction,
A method for driving a segment of a tire mold, wherein the first segment is controlled so as to always reach the closed position of the tread mold portion before the second segment.