JP2008188852A - Tire vulcanization molding device and vulcanization molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To exfoliate a bladder by surely introducing pressurized gas between a tire and the bladder after vulcanization molding. <P>SOLUTION: A pressurized gas introducing path 40 having an opening 41 of one end side abutting on the bladder 20 is formed at an underside bead ring 14 of a tire vulcanization molding device 1. A pressurized gas supply fixture 52 for supplying the pressurized gas is constituted there so as to approach and separate from the opening 42 at the other end side to be moved by a moving means 54. A contact displacement member 61 is mounted to the pressurized gas supply fixture 52 to be inserted in the pressurized gas introducing path 40. When supplying the pressurized gas, the pressurized gas supply fixture 52 is moved to a position where the supply port 52A communicates with the pressurized gas introducing path 40. The tip of the contact displacement member 61 is brought in contact with the bladder 20, thereby to be displaced to the inner side to get the bladder 20 separated from the opening 41 where the pressurized gas is introduced between a tire 5' after vulcanization and the bladder 20 to exfoliate the bladder 20. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a tire vulcanization molding apparatus and a vulcanization molding method for inflating and vulcanizing a bladder in a green tire (green tire), and in particular, the bladder can be reliably peeled from the tire after vulcanization molding. The present invention relates to a tire vulcanization molding apparatus and a vulcanization molding method.

  A pneumatic tire is generally formed into a predetermined shape by molding a raw tire by combining various tire constituent members made of unvulcanized rubber or the like, and vulcanizing and molding the tire. In this vulcanization molding process, conventionally, a tire vulcanization molding apparatus is widely used in which a raw tire is housed in a rigid outer mold, a bladder is expanded inside and the raw tire is pressed against the outer mold to vulcanize and mold. ing.

FIG. 4 is a main part cross-sectional view schematically showing an example of such a conventional tire vulcanization molding apparatus, and shows a cross section in a direction corresponding to the width direction of a raw tire to be vulcanized and molded. It is a semi-sectional view which expands and shows one side (right side in a figure).
As shown in the drawing, the tire vulcanization molding apparatus 90 includes an outer mold 10 that defines the outer shape of the tire, an inflatable substantially bag-like bladder 20 disposed inside thereof, and a radially inner side of the bladder 20 ( And clamping means 30 for locking and holding both end portions 21 on the left side in the figure.

  The outer mold 10 includes an upper mold 11 and a lower mold 12 that mold an outer surface shape from a tread portion to a side portion of the green tire 5, an upper bead ring 13 and a lower bead ring 14 that mold an outer surface shape near the bead portion, and the like. For example, the upper mold 11 and the upper bead ring 13 are moved up and down to open and close the internal space (cavity). The clamp means 30 includes outer bladder rings 31 and 32 disposed on both outer sides of the bladder 20 and inner bladder rings 33 and 34 disposed on the inner side of the end portion 21 of the bladder 20. The end portion 21 is sandwiched and locked from both sides.

  In the tire vulcanization molding apparatus 90, the raw tire 5 is accommodated in the outer mold 10, a hot fluid such as high-temperature / high-pressure steam is supplied into the bladder 20 disposed therein, and the bladder 20 is expanded. The internal pressure is raised, and the raw tire 5 is pressed against the inner surface of the outer mold 10 with this pressure, and the raw tire 5 is heated and molded to perform vulcanization molding. By this heat and pressure, the rubber and sulfur of the green tire 5 undergo a cross-linking reaction (vulcanization reaction), and the members constituting the green tire 5 are bonded to each other, so that the strength and Various performances such as elasticity and durability are imparted. At the same time, the heated green tire 5 is pressed against the outer mold 10 and deformed, and the final shape and tread pattern (tread pattern) are also formed. Thereafter, the internal pressure of the bladder 20 is reduced, the bladder 20 is peeled off from the inner surface of the vulcanized tire 5 ′ and extracted from the tire 5 ′, and the tire 5 ′ is taken out from the outer mold 10 to complete the product tire. .

  However, in such a conventional tire vulcanization molding apparatus 90, due to heat and pressure during vulcanization molding, the outer surface of the bladder 20 is in close contact with the inner surface of the tire 5 ′, and their peeling tends to be incomplete. There is a problem. As a result, when the bladder 20 is pulled out or when the tire 5 ′ after vulcanization molding is taken out, a part of the tire 5 ′ such as the bead portion is deformed due to being pulled by the closely attached bladder 20 to cause a product defect. Sometimes. On the other hand, when the bladder 20 is peeled off from the tire 5 ′ or the like that is in close contact with the bladder 20, a large stress or the like acts on the bladder 20 in particular, and the outer bladder rings 31 and 32 and the bead ring 13 on the radially inner side are particularly affected. Cracks and the like are likely to occur in the vicinity of the vicinity in contact with 14. As a result, there is a problem that the bladder 20 is damaged relatively early, the life (number of times of use) is shortened, the number of replacements is increased, and the productivity of vulcanization molding is lowered.

  Therefore, conventionally, a pressurized gas such as high-pressure air (so-called peeling air) is introduced between the tire 5 ′ and the bladder 20 before the tire 5 ′ after vulcanization molding is taken out, and these are peeled off in advance. (See Patent Document 1).

  Here, this conventional tire vulcanization molding apparatus 90 (see FIG. 4) also supplies pressurized gas from the end 21 side of the bladder 20, introduces it between the bladder 20 and the tire 5 ', and peels them off. For this purpose, a pressurized gas supply means 50 and the like are provided.

FIG. 5 is a main part sectional view schematically showing a configuration for introducing the pressurized gas provided in the conventional tire vulcanization molding apparatus 90, and shows the vicinity of the X region in FIG. 4 in an enlarged manner.
In the tire vulcanization molding apparatus 90, as shown in the drawing, the lower bead ring 14 is formed with a through hole in which the opening 41 on one end side (upper side in the figure) contacts the bladder 20, and the pressurized gas introduction path 40. The pressurized gas supply means 50 is attached to the opening 42 on the other end side (lower side in the figure). The pressurized gas supply means 50 includes a pressurized gas source 51 such as a compressor, a pressurized gas supply jig 52 provided with a pressurized gas discharge port (supply port) 52A, and a tube such as a hose connecting them. The supply port 52A of the pressurized gas supply jig 52 is connected to the pressurized gas introduction channel 40, and the pressurized gas from the pressurized gas source 51 is supplied from the supply port 52A via the conduit 53. Supply to the pressurized gas introduction path 40 (arrow K in FIG. 5).

  The tire vulcanization molding apparatus 90 introduces the supplied pressurized gas from the opening 41 of the pressurized gas introduction path 40 between the inner surface of the tire 5 ′ after vulcanization molding and the outer surface of the bladder 20 (FIG. 5). Arrow D), and the bladder 20 is peeled off from the tire 5 ′ by the force. This prevents the bladder 20 from being pulled out or the tire 5 ′ after vulcanization molding from being taken out in a state where the bladder 20 and the tire 5 ′ are in close contact with each other, thereby suppressing the deformation of the tire 5 ′ described above. However, the cycle time of the vulcanization molding is shortened by extending the life of the bladder 20 and reducing the time required for peeling the bladder 20 and the like.

  However, in this conventional tire vulcanization molding apparatus 90, the outer surface of the bladder 20 is in close contact with the lower bead ring 14 and the surroundings of the pressurized gas introduction path 40 (opening 41) and the tire 5 ′ and the bladder. 20 may be difficult to introduce a pressurized gas, and the amount of introduction may be reduced or stopped, and a sufficient peeling effect of the bladder 20 may not be obtained. Further, when the number of times of use of the bladder 20 is increased, the bladder 20 repeatedly contacting the opening 41 of the pressurized gas introduction path 40 is marked with a mark of the opening 41 to form a convex portion, which is the pressurized gas introduction path 40. The opening 41 may be blocked by entering inside. As a result, in the tire vulcanization molding apparatus 90, with the use of the bladder 20, there is a tendency that the bladder 20 is gradually peeled off even when the pressurized gas is introduced, and in some cases, the opening 41 is completely removed. There is a problem that the introduction of the pressurized gas is stopped due to the blockage.

  As a method of dealing with such a problem, a plurality of pressurized gas introduction paths 40 are formed along the circumferential direction of the lower bead ring 14 to increase the number thereof, and pressurized gas is supplied from the plurality of locations. It is conceivable to introduce between the bladder 20 and the tire 5 '. By doing in this way, while the quantity etc. by which pressurized gas is introduce | transduced increase, even if some pressurized gas introduction paths 40 are obstruct | occluded, pressurized gas is received from other pressurized gas introduction paths 40. Since it is introduced, peeling of the bladder 20 from the tire 5 'can be performed more reliably. However, in this case, the structure of the tire vulcanization molding apparatus 90 becomes complicated and the number of parts and the like increases because it is necessary to provide the pressurized gas supply means 50 for each pressurized gas introduction path 40. Further, there arises a new problem that the cost required for manufacturing the tire vulcanization molding apparatus 90 and the labor required for maintenance and the like increase.

JP 59-20645 A

  The present invention has been made in view of the above-described conventional problems, and the object thereof is to remove a bladder by introducing a pressurized gas between a tire and a bladder after vulcanization molding with a simple configuration. It is to extend the life of the bladder while suppressing the occurrence of product defects in the tire.

The invention according to claim 1 includes an outer mold that can store a raw tire and an inflatable bladder disposed in the raw tire, and the bladder is inflated in the raw tire stored in the outer mold. A tire vulcanization molding apparatus that presses the green tire against the outer mold to perform vulcanization molding, wherein an opening on one end abuts the expanded bladder, and the tire and the bladder after vulcanization molding from the opening A pressurized gas introduction path for introducing a pressurized gas between them, a pressurized gas supply means for supplying the pressurized gas to the opening on the other end side of the pressurized gas introduction path, and the pressurization Displacement means for displacing the bladder in contact with the opening on one end side of the pressurized gas introduction path when the pressurized gas is supplied by the gas supply means and separating the bladder from the opening. To do.
According to a second aspect of the present invention, in the tire vulcanization molding apparatus according to the first aspect, the displacement means is inserted into the pressurized gas introduction path, and moves in the pressurized gas introduction path to It has a contact displacement member that contacts and displaces the bladder in contact with the opening on one end side.
A third aspect of the present invention is the tire vulcanization molding apparatus according to the second aspect, wherein the pressurized gas supply means is a movable pressurized gas provided with a supply port for supplying the pressurized gas. A supply jig, and a supply position of the pressurized gas, wherein the supply port communicates with the pressurized gas introduction path, and a separation position spaced apart from the opening on the other end side. And moving the contact displacement member in the pressurized gas introduction path by the pressurized gas supply jig that moves from the separated position to the supply position. Displaced by contact.
The invention according to claim 4 is the tire vulcanization molding apparatus according to claim 3, wherein the contact displacement member is attached to a position facing the opening on the other end side of the pressurized gas supply jig, It moves integrally with the pressurized gas supply jig.
The invention according to claim 5 is a tire vulcanization molding method in which a bladder is inflated in a raw tire housed in an outer mold, an internal pressure of the bladder is increased, and the raw tire is pressed against the outer mold to be vulcanized. A step of reducing the internal pressure of the bladder after completion of vulcanization molding, a step of supplying pressurized gas between the tire after vulcanization molding and the bladder, and at the time of supplying the pressurized gas, Displacing the bladder at the supply position of the pressurized gas to move away from the supply position; introducing the pressurized gas between the tire after vulcanization molding and the bladder from the separated position; And a step of peeling the bladder from the vulcanized tire.
According to a sixth aspect of the present invention, in the tire vulcanization molding method according to the fifth aspect, the step of supplying the pressurized gas is performed from a pressurized gas introduction path in which an opening on one end side contacts the expanded bladder. The step of supplying and separating the pressurized gas is characterized by displacing the bladder in contact with the opening on one end side of the pressurized gas introduction path so as to be separated from the opening.

  According to the present invention, it is possible to reliably introduce a pressurized gas between a tire after vulcanization molding and a bladder with a simple configuration to separate the bladder, and to suppress the occurrence of product defects in the tire. However, the life of the bladder can be extended.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view schematically illustrating a main part of a tire vulcanization molding apparatus according to the present embodiment. A cross section in a direction corresponding to a width direction of a raw tire to be vulcanized and one side of the cross section It is a half sectional view showing an enlarged view of the right side in the figure.

  As shown in the figure, the tire vulcanization molding apparatus 1 includes an outer mold 10 that can store a raw tire 5, a bladder 20 that is disposed in the raw tire 5, and a radially inner side (left side in the drawing) of the bladder 20. Clamping means 30 for holding both end portions 21, and the raw tire 5 is housed in a space (cavity) formed in the outer mold 10 and vulcanized.

  The outer mold 10 is a mold that defines the outer shape of the tire, and is made of a rigid body such as an aluminum-based material or an iron-based material. In addition, the outer mold 10 includes an upper mold 11 and a lower mold 12 which are arranged vertically so as to cover the whole with the raw tire 5 interposed therebetween, and the radial tire inner side (the left end in the drawing) of the raw mold 5 side. It is comprised from the substantially cyclic | annular upper side bead ring 13 and the lower side bead ring 14 which are arrange | positioned at the edge part (the lower side of the upper mold | type 11 and the upper side of the lower mold | type 12).

  The upper mold 11 and the lower mold 12 are for molding the outer surface shape from the tread portion to the side portion of the raw tire 5, and are combined from the vertical direction around the equator plane of the raw tire 5, and in that state, As a result, a concave cavity that can accommodate the raw tire 5 is formed on the inner periphery. The inner surfaces of the upper mold 11 and the lower mold 12 on the raw tire 5 side are formed in a substantially toroidal shape as a whole corresponding to the outer surface shape of the tire to be molded, and on the lower surface of the upper mold 11 and the upper surface of the lower mold 12. The side molding surface that molds the outer shape of the side part of the green tire 5 corresponds to the tread molding surface that consists of various grooves that mold the outer shape of the tread part of the raw tire 5 on each side surface (inner circumferential surface). It is formed in the shape to do.

  The upper bead ring 13 and the lower bead ring 14 form an outer surface shape in the vicinity of the bead portion of the raw tire 5 (from the side surface to the inner peripheral surface of the bead portion), and each raw tire 5 side has a cross-section of the bead portion. It is cut into a shape corresponding to the shape to form a concave curved surface. On the other hand, the surface (opposite surface) on the bladder 20 side of each of the rings 13 and 14 abuts on the end portion 21 side of the outer surface of the bladder 20 that expands during vulcanization molding, and supports the bladder 20 in the vicinity thereof in a predetermined position. It is the positioning surface to be placed.

  Further, at least one of the upper mold 11 and the lower mold 12 stores the raw tire 5 in the cavity and takes out the tire 5 ′ after vulcanization molding, so that the upper bead ring 13 or the lower bead ring 14 is respectively removed. In addition, it is configured to be movable in the mold opening direction. In this tire vulcanization molding apparatus 1, the upper mold 11 and the upper bead ring 13 can be moved up and down, and moved up and down by an elevating means (not shown) using a piston / cylinder mechanism. The outer mold 10 is opened and closed.

  The bladder 20 expands in the raw tire 5 accommodated in the outer mold 10 during vulcanization molding and presses the raw tire 5 against the inner surface of the outer mold 10 and has heat resistance such as rubber. However, it is formed in a substantially bag shape that can be expanded and contracted by a stretchable material. Although not shown, the bladder 20 is connected with a means for supplying a high-temperature and high-pressure thermal fluid such as steam or heated gas and a means for exhausting the fluid inside the bladder 20. During vulcanization molding, the raw tire 5 is heated to a predetermined temperature while being expanded by the supplied hot fluid and pressing the raw tire 5 against the outer mold 10 with a predetermined pressure. On the other hand, after completion of the vulcanization molding, the inside is released to the atmosphere to release the pressing to the tire 5 ', and the internal fluid is exhausted, contracted, etc., and extracted from the tire 5'. Further, both ends 21 of the bladder 20 are formed in a substantially T-shaped cross section, and are respectively engaged with the clamping means 30.

  The clamp means 30 includes outer bladder rings 31 and 32 disposed outside the both ends 21 of the bladder 20 and inner bladder rings 33 and 34 disposed inside the both ends 21 of the bladder 20 so as to face each other. The upper end 21 of the bladder 20 is sandwiched by the outer bladder ring 31 and the inner bladder ring 33 and the lower end 21 is sandwiched and locked by the outer bladder ring 32 and the inner bladder ring 34, respectively. The upper bladder rings 31 and 33 and the lower bladder rings 32 and 34 are both formed in a substantially annular shape, firmly hold the end portion 21 of the bladder 20 and sandwich the end portion 21 in an airtight state. In such a state that they are combined, they are formed in a shape corresponding to the cross-sectional shape of the end portion 21. Further, the outer bladder rings 31 and 32 extend from the end portion 21 of the bladder 20 to the respective bead rings 13 and 14 along the outer surface thereof, and the surface on the bladder 20 side is the bladder of each of the bead rings 13 and 14. It is formed to be smoothly continuous with the surface on the 20 side.

  In addition to the above, the tire vulcanization molding apparatus 1 introduces a pressurized gas (for example, high-pressure air or nitrogen) between the tire 5 ′ after vulcanization molding and the bladder 20, For this purpose, a pressurized gas introduction path 40 and a pressurized gas supply means 50 are provided.

FIG. 2 is an enlarged cross-sectional view of the main part showing the vicinity of the Y region of the tire vulcanization molding apparatus 1 of FIG. 1, and schematically shows a configuration for introducing pressurized gas.
As shown in the drawing, the tire vulcanization molding apparatus 1 according to the present embodiment includes a pressurized gas introduction path 40 provided in the lower bead ring 14, a pressurized gas supply means 50 for supplying the pressurized gas thereto, Displacement means 60 for displacing the bladder 20 at a predetermined position.

  The pressurized gas introduction path 40 is disposed at a position where the opening 41 on one end side (the upper end side in the drawing) contacts the expanded bladder 20 during vulcanization molding, and the opening on the other end side (the lower end side in the drawing). This is a passage for introducing the pressurized gas from the pressurized gas supply means 50 supplied to the portion 42 between the tire 5 ′ and the bladder 20 from the opening 41 on the one end side. In the present embodiment, the pressurized gas introduction path 40 is formed at one place in the circumferential direction of the lower bead ring 14 from the contact surface (upper surface in the drawing) to the bladder 20 to the other surface (lower surface). The extending through hole is formed so that the cross-sectional shape including the upper and lower openings 41 and 42 is a circular shape having a predetermined radius and extends substantially linearly in the vertical direction.

  The pressurized gas supply means 50 includes a pressurized gas source 51 such as a compressor, a pressurized gas supply jig 52 provided with a pressurized gas supply port 52A, a deformable pipe 53 such as a hose connecting them, The moving means 54 for moving the pressurized gas supply jig 52 and the supply of the pressurized gas from the pressurized gas source 51 are adjusted and blocked, for example, provided between the pressurized gas source 51 and the conduit 53. And a solenoid valve (not shown).

  The pressurized gas supply jig 52 has a substantially plate shape, and its supply port 52A (here, a substantially circular port) is formed in a size corresponding to the size of the pressurized gas introduction path 40, and in the inside thereof. A passage 52B is formed that guides the pressurized gas sent from the pressurized gas source 51 through the conduit 53 to the supply port 52A. The pressurized gas supply jig 52 is configured to be movable in a direction approaching and separating from the lower bead ring 14, and the supply port 52 </ b> A is maintained substantially concentric with the pressurized gas introduction path 40. The supply port 52A is moved closer to and away from the opening 42 of the pressurized gas introduction path 40.

  The moving means 54 is for moving the pressurized gas supply jig 52 as described above. For example, a pneumatic or hydraulic piston / cylinder mechanism, a driving mechanism including a stepping motor, a rack and a pinion, and the like are well known. It consists of means. In this pressurized gas supply means 50, a pneumatic piston / cylinder mechanism is used as the moving means 54, the piston rod 54 </ b> P is arranged upward, and a pressurized gas supply jig 52 is attached to the tip thereof. . Further, the moving means 54 moves the piston rod 54P in and out of the cylinder 54S to advance and retreat, and the pressurized gas supply jig 52 (supply port 52A) approaches and separates from the pressurized gas introduction path 40 (opening 42). Let The moving means 54 moves the pressurized gas supply jig 52 in this way, and the supply port 52A communicates with the pressurized gas introduction path 40 (opening 42) to supply the pressurized gas (see FIG. 2B) and a reciprocating position (see FIG. 2A) spaced apart from the opening 42 by a predetermined distance downward.

  The pressurized gas supply means 50 causes the moving means 54 to move the pressurized gas supply jig 52 from the separation position to the supply position, and to supply the pressurized gas from the pressurized gas source 51 via the pipe line 53. The pressurized gas introduction path 40 is supplied from the supply port 52A. A pressurized gas sealing member (not shown) such as an O-ring is attached around the supply port 52A of the pressurized gas supply jig 52, and the supply port 52A is added at the supply position described above. It is arranged substantially concentrically with the opening 42 of the pressurized gas introduction path 40, and the portion around the supply port 52A and the opening 42 (opposing surface) sandwiches the sealing member. The pressurized gas supply means 50 is sealed by this sealing member to connect the supply port 52A and the pressurized gas introduction path 40 to each other, and prevents the pressurized gas from the supply port 52A from leaking to the surroundings. While being supplied to the pressurized gas introduction path 40.

  The pressurized gas supply jig 52 of the pressurized gas supply means 50 has a displacement means 60 for displacing a part of the expanded bladder 20 from the outside to the inside (from the bottom to the top in the figure). It is attached.

  The displacement means 60 displaces the bladder 20 in contact with the opening 41 on one end side of the pressurized gas introduction path 40 (see FIG. 2B) when the pressurized gas is supplied by the pressurized gas supply means 50, so The bladder 20 is separated from the opening 41. Thereby, the displacing means 60 applies a force in the inner (upper side in the drawing) direction to the opening 41 and the surrounding bladder 20, and peels off the portion that is in close contact with the lower bead ring 14 from the surface thereof. The inlet (introduction part) of the pressurized gas from the introduction path 40 is ensured to assist the introduction of the pressurized gas between the outer surface of the bladder 20 and the inner surface of the lower bead ring 14 and the tire 5 ′. .

  In this embodiment, the displacement means 60 has a substantially rod-shaped contact displacement member 61 disposed in the pressurized gas introduction path 40, and the lower end thereof is on the lower bead ring 14 side of the pressurized gas supply jig 52. It is attached to the surface (upper side in the figure) and is configured integrally with the pressurized gas supply means 50. That is, in the tire vulcanization molding apparatus 1, the pressurized gas supply jig 52 is moved from the above-described separated position (see FIG. 2A) to the supply position (see FIG. 2A) with the contact displacement member 61 inserted into the pressurized gas introduction path 40. 2B), the contact displacement member 61 is moved in the pressurized gas introduction path 40. By this movement, the tip of the contact displacement member 61 is brought close to and brought into contact with the bladder 20 in contact with the opening 41, and the bladder 20 at that portion is displaced upward (see FIG. 2B) to be separated from the opening 41. .

  Accordingly, the contact displacement member 61 of the displacing means 60 is attached at a position facing the pressurized gas introduction path 40 (opening 42) of the pressurized gas supply jig 52 and is inserted into the pressurized gas introduction path 40. It is formed in a size and shape that can be moved. Here, it is formed in a substantially straight line shape that is narrower than the pressurized gas introduction path 40. Further, the contact displacement member 61 is disposed at a predetermined position in the pressurized gas introduction path 40 where the tip thereof does not contact the bladder 20 when the pressurized gas supply jig 52 is in the above-described separated position, and is pressurized. While the gas supply jig 52 moves to the supply position, the tip contacts the bladder 20, and the bladder 20 is displaced by a predetermined distance at the supply position. Therefore, the contact displacement member 61 has a predetermined length longer than that of the pressurized gas introduction path 40 according to the amount (distance) by which the bladder 20 is displaced, the movement amount (stroke) of the pressurized gas supply jig 52, and the like. Is formed. Further, the contact displacement member 61 is provided with a gap between the inner surface of the pressurized gas introduction path 40 in order to smoothly flow the pressurized gas in the pressurized gas introduction path 40 and ensure a sufficient flow rate. For example, the pressurized gas introduction passage 40 is formed in a shape that allows the pressurized gas to flow without being blocked.

Hereinafter, the shape and the like of the contact displacement member 61 will be described more specifically.
3 is an enlarged schematic view showing the displacement means 60 (contact displacement member 61) and the pressurized gas supply jig 52. FIG. 3A is a side view seen from the same direction as FIG. 2, and FIG. FIG.

  As shown in the figure, the contact displacement member 61 of the present embodiment is formed in a cross shape (see FIG. 3B) in a direction orthogonal to the longitudinal direction by combining substantially rectangular plate-like members 61A, and has a lower end portion. Crosses the supply port 52A of the pressurized gas supply jig 52 in the diameter direction, and each of the substantially cross-shaped tips is fixed to the edge of the supply port 52A. Further, the contact displacement member 61 extends from the fixed end in a direction (upward in FIG. 3A) to a surface 52C (surface facing the lower bead ring 14) where the supply port 52A of the pressurized gas supply jig 52 is formed. A substantially cylindrical contact portion 61 </ b> B that extends in a substantially linear shape toward the direction) and that contacts the bladder 20 is provided at the tip thereof. The contact displacement member 61 comes into contact with the bladder 20 at the tip surface 61C of the contact portion 61B. However, the tip surface 61C is formed as a flat smooth surface to prevent the bladder 20 at the contact position from being damaged. ing.

  The contact displacement member 61 is moved integrally with the pressurized gas supply jig 52 by the moving means 54 (see FIG. 2), and moves in the pressurized gas introduction path 40 toward the bladder 20 when the pressurized gas is supplied. Then, the front end surface 61C is brought into contact (contact) with the bladder 20, and the bladder 20 at the contact position is pushed up and displaced inward. At that time, when the pressurized gas supply jig 52 is moved to the pressurized gas supply position (see FIG. 2B), the contact displacement member 61 is entirely outside the pressurized gas introduction path 40. Protruding. Thus, the contact displacement member 61 (displacement means 60) peels the bladder 20 from the lower bead ring 14 to secure the above-described pressurized gas introduction port and the pressurized gas supplied from the supply port 52A. Is guided between the bladder 20 and the tire 5 'through the gap between the substantially cross-shaped plate member 61A and the pressurized gas introduction path 40, the space on the lower surface of the contact portion 61B, and the like.

Next, the procedure, operation | movement, etc. which vulcanize-mold the raw tire 5 with the tire vulcanization molding apparatus 1 demonstrated above are demonstrated.
The following procedures and the like are controlled by a control device (not shown) such as a microcomputer, and each part of the device is operated at a predetermined timing based on a predetermined program or preset conditions. , Run in conjunction with each other.

  At the time of vulcanization molding, first, the raw tire 5 is accommodated in the outer mold 10 (see FIG. 1), and a thermal fluid such as high-temperature and high-pressure steam is supplied into the bladder 20 disposed therein, and the bladder 20 is It is inflated and brought into contact with the inner surface of the green tire 5. Subsequently, the internal pressure of the bladder 20 is increased to a predetermined pressure, the outer surface of the raw tire 5 is pressed against the inner surface (molded surface) of the outer mold 10, and the raw tire 5 is heated to a predetermined vulcanization temperature. With this heat and pressure, the raw tire 5 is deformed into a shape corresponding to the inner shape of the outer mold 10 and shaped, and the vulcanization reaction proceeds while being molded. Produce product tires with performance. After the vulcanization molding is completed in this way, the outer mold 10 is opened by releasing the air inside the bladder 20 to lower the internal pressure and raising the upper mold 11 and the upper bead ring 13.

  Subsequently, the pressurized gas supply means 50 supplies pressurized gas from the pressurized gas introduction path 40 between the tire 5 ′ after vulcanization molding and the bladder 20, and the bladder 20 is connected to the inner surface of the tire 5 ′. The peeling process to peel from is performed. When supplying the pressurized gas, first, the moving means 54 moves the pressurized gas supply jig 52 from the separated position (see FIG. 2A) to approach the lower bead ring 14. As a result, the supply port 52A of the pressurized gas supply jig 52 is moved toward the opening 42 of the pressurized gas introduction path 40, and the contact displacement member 61 is moved in the pressurized gas introduction path 40. The tip surface 61C of the contact portion 61B is moved toward the opening 41 (the bladder 20) of the pressurized gas introduction path 40.

  Subsequently, the pressurized gas supply jig 52 is moved to the pressurized gas supply position (see FIG. 2B), and is brought into close contact with the lower bead ring 14 with a sealing member (not shown) interposed therebetween. 52A is communicated with the pressurized gas introduction path 40 (opening 42). At the same time, the contact displacement member 61 (displacement means 60) that moves integrally with the pressurized gas supply jig 52 displaces the bladder 20 at the supply position of the pressurized gas and separates it from the supply position. Specifically, the distal end surface 61C of the contact portion 61B is displaced by being brought into contact with the bladder 20 in contact with the opening 41 of the pressurized gas introduction path 40, and the bladder 20 at the contact position is pushed inward. In this manner, the bladder 20 around the opening 41 is peeled off from the lower bead ring 14 and displaced to a spaced position away from the opening 41 to secure the above-described pressurized gas inlet.

  Next, pressurized gas is supplied from the pressurized gas supply means 50 (supply port 52A) to the pressurized gas introduction path 40, and the tire 5 ′ after vulcanization molding is supplied from the separation position (introduction port) of the bladder 20. A pressurized gas is introduced between the inner surface and the outer surface of the bladder 20. The pressurized gas is continuously supplied from the opening 41 on the bladder 20 side of the pressurized gas introduction path 40 for a predetermined time, and is introduced over the entire area between the tire 5 ′ and the bladder 20. Remove from '. Next, the supply of the pressurized gas is stopped, and the pressurized gas supply jig 52 and the contact displacement member 61 are moved to the separation position (see FIG. 2A). Thereafter, the bladder 20 is extracted from the inside of the tire 5 ′ by exhausting the fluid from the inside of the bladder 20 and contracting, and the tire 5 ′ is taken out from the inside of the outer mold 10 to complete the vulcanization molding process.

  As described above, in this embodiment, when the pressurized gas is introduced, the bladder 20 is separated from the opening 41 by the displacing means 60. For example, the bladder 20 is firmly attached to the lower bead ring 14 or the like. Sometimes, the bladder 20 around the opening 41 can be forcibly removed from the lower bead ring 14. Thus, since the inlet for introducing the pressurized gas around the opening 41 can be reliably ensured, the pressurized gas from the pressurized gas introduction path 40 is used as the bladder 20 and the tire 5 ′ after vulcanization molding. The bladder 20 can be surely introduced between the tires 5 ′ and reliably peeled off. In addition, the bladder 20 peels off as the number of uses increases, such as the introduction of pressurized gas, even when the convex portion is formed in the bladder 20 with the above-described use and the opening 41 is thereby blocked. It can be prevented from becoming difficult, and a sufficient peeling effect can be maintained over a long period of time.

  Accordingly, since the bladder 20 and the tire 5 ′ after vulcanization molding are in close contact with each other, it is possible to prevent the bladder 20 from being pulled out or the tire 5 ′ from being taken out. It is also possible to suppress the occurrence of product defects due to deformation or the like. Further, since it is possible to suppress the occurrence of cracks, damage, and the like due to pulling in the bladder 20, the number of times that the bladder 20 can be used increases, and the life of the bladder 20 can be extended. At the same time, operations such as peeling of the bladder 20 and extraction from the tire 5 'can be performed smoothly, and the time required for them can be shortened, so that the cycle time of the vulcanization molding process can be shortened and the productivity can be improved. .

  In the tire vulcanization molding apparatus 1, the contact displacement member 61 is moved in the pressurized gas introduction path 40 to displace the bladder 20, so that the bladder 20 in contact with the opening 41 is displaced reliably and accurately. Can be separated. In addition, since the contact displacement member 61 is moved together with the pressurized gas supply jig 52 that moves to the pressurized gas supply position to displace the bladder 20, the bladder 20 is moved from the opening 41 during the supply of pressurized gas. It can be reliably separated. Therefore, the introduction of the pressurized gas between the bladder 20 and the tire 5 'and the peeling of the bladder 20 by it can be performed reliably.

  Further, in the tire vulcanization molding apparatus 1, it is not necessary to increase the number of the pressurized gas introduction passages 40, the pressurized gas supply means 50, etc. in order to peel the bladder 20 reliably, and the contact displacement member 61 is added. Since the displacement means 60 of the bladder 20 is configured by being attached to the compressed gas supply jig 52 and moved integrally, the structure and mechanism of the apparatus are not complicated, and a large peeling effect can be obtained with a relatively simple configuration. As a result, the number of parts or the like does not increase greatly, and the occurrence of a failure or the like can be suppressed. Therefore, it is possible to suppress an increase in costs and labor required for manufacturing the tire vulcanization molding apparatus 1 and maintaining it. You can also

  Therefore, according to the present embodiment, with a simple configuration, the pressurized gas can be introduced between the tire 5 ′ after vulcanization and the bladder 20 and the bladder 20 can be peeled off reliably, and the tire 5 ′. The life of the bladder 20 can be extended while suppressing the occurrence of product defects.

  In the present embodiment, the pressurized gas introduction path 40 is formed in the lower bead ring 14, but the pressurized gas introduction path 40 is configured by the upper bead ring 13 (see FIG. 1) and the upper and lower outer bladder rings 31 and 32. For example, the opening on one end side may be in contact with the bladder 20 and may be formed at another position where the pressurized gas can be introduced between the bladder 20 and the tire 5 '.

  Also, the contact displacement member 61 is not attached to the pressurized gas supply jig 52, but has a cut portion (convex portion) that hooks the contact portion 61B and prevents its fall in the pressurized gas introduction path 40, for example. For example, it may be arranged so as to be movable in the pressurized gas introduction path 40. In this case, the moving pressurized gas supply jig 52 is pushed up by contacting the lower end of the contact displacement member 61, thereby moving the contact displacement member 61 in the pressurized gas introduction path 40. Similarly, the pressurized gas supply jig 52 is fixed to the lower bead ring 14, a through hole connected to the pressurized gas introduction path 40 is formed therein, and a longer contact than this embodiment is formed in this through hole. The displacement member 61 may be inserted through a sealing member or the like, and the contact displacement member 61 may be moved by a moving unit to be brought into contact with or separated from the bladder 20. Thus, the contact displacement member 61 (displacement means 60) is configured separately from the pressurized gas supply jig 52 (pressurized gas supply means 50), and is moved independently to displace the bladder 20. May be.

  Furthermore, in the tire vulcanization molding apparatus 1 described above, the side part is molded from the tread part of the raw tire 5 by two molds (upper mold 11 and lower mold 12). You may be comprised from several metal mold | dies, such as what consists of a pair of side part shaping | molding metal mold | die to shape | mold, and a tread part shaping | molding metal mold | die which has a some segment which shape | molds a tread part. In addition, in this embodiment, the case where the tire 5 ′ is taken out from the outer mold 10 after the bladder 20 is peeled off from the tire 5 ′ after vulcanization molding has been described as an example. This is also applicable to the case where the bladder 20 is peeled off at another place or timing, such as performing the peeling step of the bladder 20 in the same manner as described above after the tire 20 is removed from the outer mold 10 without being peeled off. Can do.

(Tire vulcanization molding test)
In order to confirm the effect of the present invention, the tire vulcanization molding apparatus 1 (see FIGS. 1, 2, and 3) of the present embodiment described above (referred to as examples hereinafter) and the displacement means 60 (contact displacement member) of the bladder 20 are described. 61) and the above-described conventional tire vulcanization molding apparatus 90 (see FIGS. 4 and 5) (hereinafter referred to as a conventional example), the raw tire 5 is vulcanized and molded, and the tire 5 ′ after vulcanization molding is obtained. The tire vulcanization molding test for removing the bladder 20 and taking out the tire 5 ′ was repeated, and the results were compared and evaluated.

  In the conventional example, the pressurized gas is interposed between the tire 5 ′ after vulcanization molding and the bladder 20 without displacing (separating from the opening 41) the bladder 20 that contacts the opening 41 of the pressurized gas introduction path 40. (Here, peeling air) was introduced, but all other than that, vulcanization molding was performed under the same conditions as in the examples.

  In this test, each device 1 and 90 performs vulcanization molding 1000 times, inspects the bead portion of the tire 5 ′ after vulcanization molding, and the bladder 20 adheres to the inner surface of the tire 5 ′. The number of defective products due to the deformation of the generated bead portion was measured, and the defect rate was compared to evaluate the peeling effect by introducing pressurized gas. Further, the number of times until the bladder 20 was replaced was counted and the number of usable times was compared, and the influence on the life of the bladder 20 was also evaluated.

  As a result, the defect rate of the conventional example was 0.7%, whereas the defect rate of the example was 0%, and in the example, the deformation failure occurred in the bead portion of the tire 5 ′ after vulcanization molding. It was found that can be completely prevented. The life of the bladder 20 was 363 times on average in the conventional example, whereas it was 412 times on average in the example, and it was found that the life of the bladder 20 was significantly increased. From this, it was found that, in the example, the pressurized gas can be reliably introduced even when the number of times of use of the bladder 20 is increased, and the bladder 20 in close contact with the tire 5 'can be reliably peeled off.

  From the above results, according to the present invention, it is possible to reliably introduce the pressurized gas between the tire 5 ′ after vulcanization molding and the bladder 20 to separate the bladder 20, resulting in a product defect in the tire 5 ′. It has been proved that the life of the bladder 20 can be extended while suppressing this.

It is principal part sectional drawing which shows the tire vulcanization molding apparatus of this embodiment typically. It is principal part sectional drawing which expands and shows the Y area | region vicinity of the tire vulcanization molding apparatus of FIG. It is a schematic diagram which expands and shows the displacement means and pressurized gas supply jig | tool of this embodiment. It is principal part sectional drawing which shows typically an example of the conventional tire vulcanization molding apparatus. It is principal part sectional drawing which shows typically the structure for introduce | transducing the pressurized gas with which the conventional tire vulcanization molding apparatus is provided.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Tire vulcanization molding apparatus, 5 ... Raw tire, 5 '... Tire, 10 ... Outer type, 11 ... Upper type, 12 ... Lower type, 13 ... Upper side Bead ring, 14 ... lower bead ring, 20 ... bladder, 21 ... end, 30 ... clamping means, 31 ... outer bladder ring, 32 ... outer bladder ring, 33 ... Inner bladder ring, 34 ... inner bladder ring, 40 ... pressurized gas introduction path, 41 ... opening, 42 ... opening, 50 ... pressurized gas supply means, 51 ... pressurized Gas source, 52 ... pressurized gas supply jig, 52A ... supply port, 52B ... passage, 53 ... pipe, 54 ... moving means, 54P ... piston rod, 54S. ..Cylinder, 60 ... displacement means, 61 ... contact displacement member, 61A ... plate member 61B · · · contact portion, 61C · · · tip surface.

Claims (6)

An outer mold capable of storing a raw tire; and an inflatable bladder disposed in the raw tire, wherein the bladder is inflated in the raw tire stored in the outer mold, and the raw tire is used as the outer mold. A tire vulcanization molding device that presses against a vulcanization molding,
An opening on one end side contacts the expanded bladder, and a pressurized gas introduction path for introducing pressurized gas between the tire after vulcanization molding and the bladder from the opening;
Pressurized gas supply means for supplying the pressurized gas to the opening on the other end of the pressurized gas introduction path;
Displacement means for displacing the bladder abutting against the opening on one end side of the pressurized gas introduction path when the pressurized gas is supplied by the pressurized gas supply means, and separating the bladder from the opening.
A tire vulcanization molding apparatus comprising: In the tire vulcanization molding apparatus according to claim 1,
The displacement means includes a contact displacement member that is inserted into the pressurized gas introduction path, moves in the pressurized gas introduction path, and contacts and displaces the bladder that contacts the opening on the one end side. A tire vulcanization molding apparatus characterized by that. In the tire vulcanization molding apparatus according to claim 2,
The pressurized gas supply means is a movable pressurized gas supply jig provided with a supply port for supplying the pressurized gas,
Movement for moving the pressurized gas supply jig between the pressurized gas supply position where the supply port communicates with the pressurized gas introduction path and a separated position separated from the opening on the other end side Means, and
The tire adding device is characterized in that the contact displacement member is moved in the pressurized gas introduction path by the pressurized gas supply jig that moves from the separated position to the supply position, and is displaced by being brought into contact with the bladder. Sulfur molding equipment. In the tire vulcanization molding apparatus according to claim 3,
A tire vulcanization molding characterized in that the contact displacement member is attached to a position facing the opening on the other end side of the pressurized gas supply jig and moves integrally with the pressurized gas supply jig. apparatus. A tire vulcanization molding method in which a bladder is inflated in a raw tire housed in an outer mold, an internal pressure of the bladder is increased, the raw tire is pressed against the outer mold, and vulcanized and molded.
Reducing the internal pressure of the bladder after completion of vulcanization molding;
Supplying a pressurized gas between the tire after vulcanization molding and the bladder;
Displacing the bladder at the supply position of the pressurized gas at the time of supplying the pressurized gas and separating the bladder from the supply position;
Introducing the pressurized gas between the vulcanized tire and the bladder from the spaced position, and peeling the bladder from the vulcanized tire;
A tire vulcanization molding method comprising: In the tire vulcanization molding method according to claim 5,
The step of supplying the pressurized gas includes supplying the pressurized gas from a pressurized gas introduction path where an opening on one end side contacts the expanded bladder,
The tire vulcanization molding method characterized in that the step of separating includes displacing the bladder in contact with the opening at one end of the pressurized gas introduction path to separate the bladder from the opening.

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