JP2020011383A - Tire vulcanizing container and tire vulcanizing method - Google Patents

Abstract

To provide a tire vulcanizing technique capable of maintaining slidability of a sliding surface of a tire vulcanizing container for a long period of time and extending a period until re-application of a lubricant.SOLUTION: A tire vulcanizing container stores a tire mold having a plurality of segments divided in circumferential direction and a pair of upper and lower side plates. The tire vulcanizing container has a plurality of sector shoes for storing each of the plurality of segments, a pair of upper and lower plates holding the pair of upper and lower side plates, and an actuator that is engaged with the outer surface of a sector shoe, thereby opening and closing the tire mold. The tire mold is configured to open and close, by sliding the plurality of sector shoes, the pair of upper and lower plates, and the actuator, with a mating member respectively, and a groove for holding a lubricant is formed on at least one of sliding surfaces that slide on each other.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a tire vulcanizing container and a tire vulcanizing method, and more particularly, to a tire vulcanizing container having excellent sliding characteristics and a tire vulcanizing method for vulcanizing a tire using the tire vulcanizing container.

  Since vulcanization molding of a tire is performed by applying heat and pressure to a green tire housed in a tire mold (mold), in a tire vulcanizing apparatus, a tire mold includes a tire vulcanization container (hereinafter simply referred to as a “vulcanization container”). (Also referred to as a "container") and transmit heat and pressure from the container to the tire mold.

  FIG. 1 is a schematic perspective view showing a general configuration of a tire vulcanizing container. As shown in FIG. 1, the tire vulcanizing container is composed of various members such as a pair of upper and lower plates (upper plate 6 and lower plate 7), a plurality of sector shoes 9 divided into a plurality in the circumferential direction, an actuator 10, and the like. These members are slid with each other when the container is opened and closed. At this time, if the sliding in the sliding portion is not uniform, the mold cannot be opened and closed uniformly, and during vulcanization, rubber enters the gap generated by the uneven sliding and causes burrs (overspew). : OV / SP). In addition, uneven sliding may cause abrasion on surfaces that slide on each other (sliding surfaces), and the frequency of maintenance increases.

  Therefore, in order to uniformly slide the container under severe conditions of high temperature and high pressure, a lubricant such as grease has conventionally been applied to the sliding surface. It has been proposed to arrange a lubricating plate made of a metal to form a sliding surface, and apply a lubricant to the surface (for example, see Patent Document 1).

JP 2014-113717 A

  However, in the case of the above-mentioned conventional technology, the effect of maintaining the slidability is limited, and it is necessary to periodically replenish the lubricant in a short cycle and reapply.

  Therefore, an object of the present invention is to provide a tire vulcanization technique capable of maintaining the slidability on the sliding surface of a tire vulcanization container for a long period of time and extending the period until re-application of the lubricant. .

  The present inventors have conducted intensive studies and found that the above-mentioned problems can be solved by the invention described below, and have completed the present invention.

The invention described in claim 1 is
A tire vulcanizing container for storing a tire mold including a plurality of segments divided in a circumferential direction and a pair of upper and lower side plates,
A plurality of sector shoes accommodating each of the plurality of segments;
A pair of upper and lower plates holding the pair of upper and lower side plates,
An actuator engaged with an outer surface of the sector shoe to open and close the tire mold,
The plurality of sector shoes, the pair of upper and lower plates, the actuator is configured to open and close the tire mold by sliding with a mating member, respectively.
A tire vulcanizing container characterized in that a groove for retaining a lubricant is formed on at least one of the surfaces sliding with each other.

The invention described in claim 2 is
The groove for holding the lubricant is formed by attaching a metal lubrication plate having a groove for holding the lubricant on at least one of the sliding surfaces. The tire vulcanizing container according to claim 1, wherein:

The invention according to claim 3 is
3. The tire vulcanizing container according to claim 2, wherein the lubricating plate is made of iron.

The invention described in claim 4 is
The tire vulcanizing container according to any one of claims 1 to 3, wherein the groove in which the lubricant is held is formed so as to be parallel to a sliding direction.

The invention according to claim 5 is
The tire vulcanizing container according to any one of claims 1 to 4, wherein a plurality of grooves for holding the lubricant are formed with a width of 1.0 to 3.0 mm. It is.

The invention according to claim 6 is
6. The groove according to claim 1, wherein a plurality of grooves for holding the lubricant are formed, each being formed at a distance of 1.0 to 3.0 mm. 5. The tire vulcanizing container according to item 1.

The invention according to claim 7 is
The tire vulcanizing container according to any one of claims 1 to 6, wherein a depth of the groove in which the lubricant is retained is 0.5 to 1.0 mm.

The invention according to claim 8 is
The tire mold is stored in the tire vulcanizing container according to any one of claims 1 to 7,
Tire vulcanization characterized by applying a lubricant to a groove in which the lubricant is retained, and opening and closing the tire vulcanizing container to open and close the tire mold to perform vulcanization of a green tire. Is the way.

The invention according to claim 9 is
The tire vulcanizing method according to claim 8, wherein fluorine grease is used as the lubricant.

  According to the present invention, it is possible to provide a tire vulcanizing technique capable of maintaining the slidability on the sliding surface of a tire vulcanizing container for a long period of time and extending the period until re-application of the lubricant.

It is a typical perspective view showing the general composition of a tire vulcanization container. It is a typical sectional view showing the general composition and operation of a tire vulcanizing device. (A) shows a state in which vulcanization is performed with the tire mold closed, and (b) shows a state in which the tire mold is opened after vulcanization. It is a typical perspective view showing appearance of a sliding part of a tire vulcanization container of an example of this embodiment. (A) shows the inner surface of the actuator, (b) shows the rear surface of the sector shoe, and (c) shows the upper surface of the lower die plate 7. FIG. 4 is a diagram illustrating a preferred mode of a groove for retaining a lubricant according to the present embodiment. (A) is a schematic perspective view and (b) is a schematic sectional view.

[1] Outline of the present invention The tire vulcanizing container of the present invention relates to a plurality of sector shoes each accommodating a plurality of segments, a pair of upper and lower plates holding a pair of upper and lower side plates, and an outer surface of the sector shoes. And an actuator for opening and closing the tire mold, wherein these members are slidably opened and closed so that the tire mold is opened and closed. The fact that the lubricant is applied to the (sliding surface) is the same as in the prior art.

  However, the present invention is different from the related art in that a groove for holding a lubricant is formed on at least one of the sliding surfaces.

  In this way, a groove for holding the lubricant is formed on at least one of the surfaces sliding with each other, and the lubricant is applied to this groove, so that the slidability on the sliding surface can be extended for a long time. Can be maintained over time. Further, since such a groove is formed, the contact area between the sliding surfaces is reduced, so that the slidability can be further improved.

  The lubricant is not limited as long as it has a lubricating effect, but fluorine grease is preferable because it has excellent heat resistance.

[2] Embodiment of the Present Invention Next, an embodiment of the present invention will be described.

1. Tire vulcanizing container and tire vulcanizing apparatus The basic configuration of the tire vulcanizing container of the present embodiment is the same as that of a conventional tire vulcanizing container. Will be described below.

  As described above, the tire vulcanizing container includes the upper die plate 6, the lower die plate 7, the sector shoe 9, and the actuator 10 (see FIG. 1).

  2A and 2B are schematic cross-sectional views showing a general configuration and operation of a tire vulcanizing apparatus. FIG. 2A shows a state in which a tire mold is closed and vulcanization is performed, and FIG. The figure shows a state in which the tire mold is opened after vulcanization. In FIG. 2, 1 is a tire vulcanizing device, and 5 is a tire mold. The tire mold 5 includes upper and lower side molds 2 and 3 and a tread segment 4 (hereinafter, also simply referred to as a “segment”) divided in a circumferential direction, and is held in the tire vulcanizing container as described above. ing. In addition, T is a tire to be vulcanized.

  In this tire vulcanizing container, an upper platen plate 11 is attached to the lift 13, and the actuator 10 is fixed to the upper platen plate 11. The actuator 10 moves up and down integrally with the elevator 13. Further, a sector shoe 9 and an upper die plate 6 are suspended from the actuator 10, and the actuator 10 moves up and down when the actuator 10 moves up and down. On the other hand, the lower mold plate 7 is fixed to the lower platen plate 12.

  Here, sliding surfaces are formed on the inner surface of the actuator 10, the back surface of the sector shoe 9, the upper end surface, the lower end surface, the outer edge of the lower surface of the upper die plate 6, and the outer edge of the upper surface of the lower die plate 7, respectively. The sector shoe 9 is in contact with the inner surface of the actuator 10, the outer edge of the lower surface of the upper die plate 6, and the outer edge of the upper surface of the lower die plate 7 through sliding surfaces.

  When the mold is opened, the elevator 13 is raised, and the actuator 10 is slid upward with respect to the sector shoe 9. The inner peripheral surface of the actuator 10 and the back surface of the sector shoe 9 are inclined, and the diameter of the sector shoe 9 expands as the actuator 10 slides. Due to this diameter expansion, the sector shoe 9 slides radially outward with respect to the upper die plate 6 and the lower die plate 7. After the diameter of the sector shoe 9 has been expanded to a predetermined position, the diameter expansion stops, and thereafter, the expanded sector shoe 9 and the upper die plate 6 are suspended by the actuator 10 and rise as the actuator 10 rises. .

  On the other hand, when the mold is closed, the tire mold 5 is closed by an operation reverse to that when the mold is opened. A guide key 17 (hereinafter, also referred to as a “T guide”) is provided on the inner surface of the actuator 10 in the height direction. The T guide 17 is slidably engaged with a sector guide 16 provided in the height direction along the back surface of the sector shoe 9, and the position of the sector shoe 9 in the circumferential direction of the tire mold 5 is changed. Fixed. When the T guide 17 reaches the upper limit, the sliding of the actuator 10 with respect to the sector shoe 9 is stopped, and the sector shoe 9 and the upper die plate 6 are suspended by the actuator 10.

2. Operation of Tire Vulcanizing Container Next, the operation of the tire vulcanizing container during tire vulcanization will be described.

  The vulcanization of the tire is performed by setting the tire T (green tire) on the lower side mold 3 and then lowering the high-temperature heated elevator 13 as shown in FIG. The mold 5 is closed. Thereby, the side surfaces of the plurality of tread segments 4 divided in the circumferential direction, the inner surface on the upper end side of the tread segment 4 and the side surface of the upper side mold 2, the inner surface on the lower end side of the tread segment 4 and the lower side mold The three side surfaces contact each other at the mating surface. Then, in accordance with this, a bladder (not shown) inside the tire T is inflated with a high-temperature heating medium to press the tire T against the tire mold 5. Thereby, the tire T is heated and pressurized from both the front and back sides, and vulcanization is performed.

  After the vulcanization, the heating medium is discharged from the bladder to stop the pressurization, and as shown in FIG. 2 (b), the elevator 13 is raised to open the container and the tire mold 5, and Remove the tire T (vulcanized tire).

3. Groove Holding Lubricant Next, a groove (hereinafter, also simply referred to as a “groove”), which is a feature of the present embodiment, that holds a lubricant will be described.

  In the present embodiment, the groove is provided on at least one of the sliding surfaces. More specifically, the mutual sliding surfaces between the inner surface of the actuator 10 and the rear surface of the sector shoe 9 and the mutual sliding surfaces between the upper end surface of the sector shoe 9 and the lower peripheral edge of the upper die plate 6. Surface, the sliding surface between the lower end surface of the sector shoe 9 and the outer edge of the upper surface of the lower die plate 7 is provided on any one of the sliding surfaces. In addition, you may provide on both sliding surfaces as needed.

  When the grooves are provided on the sliding surfaces of each other as described above, the applied lubricant is held in the grooves, and a new lubricant is sequentially applied to the sliding surfaces according to the consumption of the lubricant on the sliding surfaces. , The state of application of the lubricant on the sliding surface can be stably maintained, and stable sliding can be obtained on the sliding portion for a long period of time. Surface wear can also be suppressed.

  In addition, this groove may be provided directly on the sliding surface of the tire vulcanizing container na itself, but by attaching a metal lubricating plate provided with a groove on which lubricant is held on the surface. Preferably, a sliding surface is formed. By using a lubricated plate with grooves, if the depth of the groove is reduced due to wear due to wear, it is only necessary to replace it with a new lubricated plate with a sufficiently deep groove. And sufficient slidability can be maintained for a long period of time. Also, the life of the tire vulcanizing container can be extended.

  The “lubricating plate” referred to here is a metal plate that is attached to improve the slidability of the sliding portion of the tire vulcanizing container. The lubricating plate may be attached to a part of each sliding surface, or may be attached to the entire sliding surface. As a specific lubricating plate, a lubricating plate made of metal such as iron is preferable from the viewpoint of retaining sufficient lubrication and exhibiting sufficient lubricating properties, and further, a solid lubricant such as graphite is used for these metals. A dispersed lubricating plate is more preferable because lubricity can be more sufficiently secured. Examples of such a metal include Debametal (trade name) (registered trademark) of Daido Metal Industry Co., Ltd. The lubricating plate preferably has a thickness of about 1 to 5 mm in consideration of the depth of the groove to be formed.

  FIG. 3 is a schematic perspective view showing an appearance of a sliding portion of the tire vulcanizing container. (A) shows the inner surface of the actuator 10 and (b) shows the back surface of the sector shoe 9. These two sliding surfaces are in contact with each other and slide in the height direction of the actuator 10 and the sector shoe 9. A lubrication plate 15 is attached to the inner surface of the actuator 10, and in this case, a groove for holding the lubricant is formed on the surface of the lubrication plate 15. (C) shows the upper surface of the lower mold plate 7, a lubrication plate 18 is attached to the outer edge portion, and the sector shoes 9 slide on the lubrication plate 18 in the radial direction of the lower mold plate 7. . In this case, a groove for holding the lubricant is formed on the surface of the lubrication plate 18.

  FIGS. 4A and 4B are diagrams showing a preferred embodiment of a groove for holding a lubricant, wherein FIG. 4A is a schematic perspective view and FIG. 4B is a schematic sectional view. Although FIG. 4 shows an example in which the groove G for holding the lubricant is provided on the surface of the lubricating plate P, the case where the groove G is provided on the sliding surface may be similarly considered. it can. In FIG. 4, S indicates the sliding direction of the container.

  In the present embodiment, the groove G in which the lubricant is held is preferably provided in parallel with the sliding direction S of the tire vulcanizing container. Since the grooves are provided in parallel with the sliding direction, friction during sliding can be reduced, and slidability can be improved.

  Specifically, for example, on the inner surface of the actuator 10 and the back surface of the sector shoe 9, the grooves G for holding the lubricant are provided in parallel with the respective height directions. On the other hand, in the case of the lower surface of the upper die plate 6 and the upper surface of the lower die plate 7, the outer edge portion is equally divided into the same number of sections as the sector shoes 9 in the circumferential direction of the plate, and the groove G in which the lubricant is held is Each section is provided in parallel with the sliding direction of the sector shoe 9 in each section.

  At this time, the groove G holding the lubricant has a width (W1) of 1.0 to 3.0 mm and a plurality of grooves G from the viewpoint of holding a sufficient amount of the lubricant and ensuring sufficient slidability. Preferably, it is formed. In addition, it is preferable that they are formed at a distance (W2) of 1.0 to 3.0 mm. When the groove G is formed in the lubricating plate as shown in FIG. 4, if the width and distance of the groove are too small, the strength is reduced and the life of the lubricating plate is shortened. The setting is made in consideration of the fact that the contact area on the moving surface increases and the frictional force increases.

  In addition, the depth D of the groove G in which the lubricant is held is preferably 0.5 to 1.0 mm, particularly preferably 0.5 mm, from the viewpoint of holding a sufficient amount of the lubricant. .

  At this time, by setting the depths of the plurality of grooves to the same value, it is possible to easily visually check the degree of wear of the grooves and to know an appropriate replacement time.

4. Tire vulcanizing method By vulcanizing a green tire using a tire vulcanizing apparatus incorporating the tire vulcanizing container having the above-described configuration, a high-quality tire without OV / SP can be stably manufactured. .

  Specifically, by holding the lubricant in the groove provided on each sliding surface of the tire vulcanizing container, it is not necessary to replenish the lubricant in a short cycle, and the tire vulcanizing container can be used for a long time. Can be smoothly opened and closed to vulcanize the green tire. Therefore, a high-quality tire without OV / SP can be stably manufactured.

  Next, the present invention will be described more specifically based on examples.

1. Experimental Conditions A tire vulcanizing container according to the present embodiment (example) in which lubricating plates having grooves for holding a lubricant are stuck to each other's sliding surfaces, and lubrication not having such grooves. The vulcanization of 1500 green tires (size: 195 / 65R15 DURAGRP) was continuously performed using a conventional tire vulcanization container to which a plate was attached (comparative example), and the OV / The generation status of SP and the remaining amount (%) of grease after use were evaluated.

(1) Example As a container, a groove (groove having a width of 10.0 mm and a depth of 0.5 mm) for holding a lubricant is provided at a distance of 10.0 mm between the inner surface of the actuator and the outer edge of the lower mold plate. The container to which the lubricated plate was attached was used. Vulcanization was performed using a vulcanizing device after applying a lubricant to a lubricating plate of the container. As a lubricant, commercially available grease (trade name: Tribon LCO, manufactured by Daizo Co., Ltd.) was used.

(2) Comparative Example After a lubricant was applied to a container having the same configuration as that of the example except that no groove was provided in the lubricating plate, vulcanization was performed using a vulcanizing apparatus.

2. Table 1 shows the results of the experiment. Note that the remaining amount of grease indicates the remaining amount of grease when the amount of grease at the start of use is 100%.

  As a result of the experiment, as shown in Table 1, in the tire vulcanizing container of the example, 90% of grease was retained even after use, and generation of OV / SP was only 20%. On the other hand, in the tire vulcanized container of the comparative example, the amount of retained grease after use was reduced to 80%, and the slidability was reduced, so that the generation of OV / SP was increased to 50%.

  Thus, it was confirmed that by applying the present embodiment, sufficient sliding performance can be maintained and occurrence of OV / SP can be reduced.

  As described above, the present invention has been described based on the embodiments, but the present invention is not limited to the above embodiments. Various changes can be made to the above embodiment within the same and equivalent scope as the present invention.

1 Tire vulcanizer 2, 3 Side mold 4 Tread segment (segment)
5 Tire Mold 6 Upper Die Plate 7 Lower Die Plate 9 Sector Shoe 10 Actuator 11 Upper Platen Plate 12 Lower Platen Plate 13 Lifting Platforms 15, 18, P Lubrication Plate 16 Sector Guide 17 Guide Key (T Guide)
D Groove depth G Lubricant holding groove S Sliding direction T Tire W1 Groove width W2 Distance

Claims (9)

A tire vulcanizing container for storing a tire mold including a plurality of segments divided in a circumferential direction and a pair of upper and lower side plates,
A plurality of sector shoes accommodating each of the plurality of segments;
A pair of upper and lower plates holding the pair of upper and lower side plates,
An actuator engaged with an outer surface of the sector shoe to open and close the tire mold,
The plurality of sector shoes, the pair of upper and lower plates, the actuator is configured to open and close the tire mold by sliding with a mating member, respectively.
A tire vulcanizing container, wherein a groove for retaining a lubricant is formed on at least one of the surfaces sliding with each other.   The groove for holding the lubricant is formed by attaching a metal lubrication plate having a groove for holding the lubricant on at least one of the sliding surfaces. The tire vulcanizing container according to claim 1, wherein:   The tire vulcanizing container according to claim 2, wherein the lubricating plate is made of iron.   The tire vulcanizing container according to any one of claims 1 to 3, wherein the groove for holding the lubricant is formed to be parallel to the sliding direction.   The tire vulcanizing container according to any one of claims 1 to 4, wherein a plurality of grooves for holding the lubricant are formed with a width of 1.0 to 3.0 mm. .   6. The groove according to claim 1, wherein a plurality of grooves for holding the lubricant are formed, each being formed at a distance of 1.0 to 3.0 mm. A tire vulcanizing container according to claim 1.   The tire vulcanizing container according to any one of claims 1 to 6, wherein a depth of the groove in which the lubricant is held is 0.5 to 1.0 mm. The tire mold is stored in the tire vulcanizing container according to any one of claims 1 to 7,
Tire vulcanization characterized by applying a lubricant to a groove in which the lubricant is retained, and opening and closing the tire vulcanizing container to open and close the tire mold to perform vulcanization of a green tire. Method.   The tire vulcanizing method according to claim 8, wherein fluorine grease is used as the lubricant.

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