JP2015104906A - Tire vulcanizing machine and tire production method using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tire vulcanizing machine in which the phase angle of rigidity core having raw tire with respect to vulcanizing mold can be adjusted prior to the introduction into vulcanizing mold, and to provide a tire production method using the same.SOLUTION: The tire vulcanizing machine central mechanism includes: a core support shaft part 15 that supports a rigidity core 2 having raw tire; a core support shaft guide part 16 that can vertically move this core support shaft part 15 and that rotatably extrapolation-holds this core support shaft part 15 around the shaft core; and a relative angle adjustment means that adjusts the phase angle of rigidity core 2 having raw tire with respect to vulcanizing mold 3 prior to the introduction into vulcanizing mold 3 by rotating the core support shaft part 15 together with the rigidity core 2 having raw tire around the shaft core and by stopping at a predetermined rotation position.

Description

  The present invention relates to a tire vulcanizer that performs vulcanization by putting a raw tire formed on a tire molding surface of a rigid core into a vulcanization mold together with the rigid core, and a tire manufacturing method using the same. .

  In order to improve the formation accuracy of a pneumatic tire, a tire forming method using a hollow toroid-shaped rigid core having an outer shape corresponding to the tire inner surface shape (hereinafter, sometimes referred to as a “core method”) has been proposed. Yes. In this core method, a tire is formed by sequentially sticking tire components on the outer surface of a rigid core, and the raw tire is put together with the rigid core into a vulcanization mold for vulcanization. Molding is performed.

  And the following patent document 1 proposes a rigid core that is applied to the construction method. This proposed rigid core has an airtight chamber chamber filled with a thermal fluid inside a plurality of core segments forming the core body, thereby enabling the internal heating of the rigid core during vulcanization. It is possible. The supply and exhaust of the thermal fluid to the chamber chamber was provided on the upper surface of a lower mold (for example, a bead ring) that forms part of the vulcanization mold and a supply / exhaust port provided on the lower surface of the rigid core. The connection port portion is connected by connecting the rigid core into the vulcanization mold.

  However, in this case, prior to the introduction into the vulcanizing mold, the rigid core with the green tire supported by the central mechanism of the vulcanizer is rotated around its axis to adjust the phase angle with respect to the vulcanizing mold. It is necessary to adjust the position of the supply / exhaust port portion to coincide with the position of the connection port portion, and the central mechanism requires a new structure.

  In addition, the tire uniformity formed by the core construction method is the raw tire formation factor that occurs when forming raw tires by sequentially sticking various tire components on the rigid core, and molding of rigid core tires. There are core factors due to the shape of the surface, mold factors due to the shape of the mold surface of the vulcanization mold, and the like. And in order to improve the said uniformity, it is preferable to cancel the influence by each factor mutually and to reduce a comprehensive influence. In this case, it is necessary to optimally adjust the phase angle of the rigid core with the green tire relative to the vulcanization mold, and the central mechanism requires a new structure for that purpose.

JP 2013-6367 A

  Therefore, the invention can adjust the phase angle of the rigid core with the green tire relative to the vulcanization mold prior to the introduction into the vulcanization mold, for example, in the rigid core capable of inner heating, A tire vulcanizer that enables automatic connection at the time of insertion between the core side supply / discharge port and the mold side connection port, or cancels out the deterioration factors of the uniformity to improve the uniformity. It is an object to provide a tire manufacturing method using the same.

The first invention of the present application is a tire vulcanization having a central mechanism for feeding a raw tire formed on the tire molding surface of a rigid core having a tire molding surface on the outer surface into the vulcanization mold together with the rigid core. Machine,
The central mechanism is
The rigid core with the green tire can be supported concentrically and moved up and down to receive the rigid core with the green tire at the raised position and the rigid core with the green tire received at the lowered position. A core support shaft that can be put into the vulcanization mold;
A core support shaft guide portion that extrapolates and holds the core support shaft portion so as to be movable up and down and rotatable around an axis;
Prior to the introduction, by rotating the core support shaft portion around the axis and stopping at a predetermined rotational position together with the received rigid core with the raw tire, the rigidity with the raw tire with respect to the vulcanization mold is reduced. Relative angle adjusting means for adjusting the phase angle of the child is provided.

In the tire vulcanizer according to the present invention, the rigid core has an inner heating chamber chamber filled with a thermal fluid inside, and a supply / discharge unit for supplying and exhausting the thermal fluid to the chamber chamber on a lower surface. While having a mouth,
The vulcanization mold includes a lower mold provided with a connection port portion connectable to the supply / discharge port portion on an upper surface,
And it is preferable that the said predetermined rotation position is a position where the said supply / discharge port part corresponds with a connection port part.

  In the tire vulcanizer according to the present invention, the relative angle adjustment means includes a drive means for rotationally driving the core support shaft portion, a rotation amount detection means for detecting the rotation amount of the core support shaft portion, and a predetermined amount. It is preferable to provide fixing means for fixing the core support shaft at the rotational position.

  In the tire vulcanizer according to the present invention, the fixing means can be integrally rotated with the core support shaft portion and has a V-shaped locking groove on the outer periphery or can be engaged with the locking groove. A rotary plate having a first engagement portion made of one of the locking projections and a second engagement portion made of the other of the locking groove or the locking projection in the radial direction toward the first engagement portion It is preferable to provide a stopper that can be freely advanced and retracted.

The second invention of the present application is a tire manufacturing method including a vulcanization step of vulcanizing a raw tire using the tire vulcanizer of the first invention,
Prior to the insertion of the rigid core with the green tire into the vulcanization mold, the core support shaft portion is rotated around the shaft core together with the received rigid core with the green tire and at a predetermined rotational position. It is characterized by comprising a relative angle adjustment step of adjusting the phase angle of the rigid core with the green tire relative to the vulcanization mold by stopping.

In the tire manufacturing method according to the present invention, the rigid core has an inside heating chamber chamber filled with a thermal fluid inside, and a supply / exhaust port for supplying and exhausting the thermal fluid to the chamber chamber on a lower surface. Has a part,
The vulcanization mold includes a lower mold provided with a connection port portion connectable to the supply / discharge port portion on an upper surface,
And the predetermined rotation position is a position where the supply / exhaust port portion coincides with the connection port portion,
Moreover, the number n of the supply / exhaust port portions and the connection port portions are the same and the same, and the supply / discharge port portions coincide with the connection port portions by being formed at equal intervals on the same circumferential line. While there are n rotational positions,
6. The rigid core with a raw tire is stopped at the rotation position that is optimal for the uniformity of the vulcanized tire among the n rotation positions in the relative angle adjustment step. The tire manufacturing method as described.

  The central mechanism of the tire vulcanizer according to the present invention is a core that extrapolates and holds a core support shaft portion that can support a rigid core with a green tire concentrically and is movable up and down and rotatable around an axis. A support shaft guide portion and a relative angle adjusting means capable of rotating the core support shaft portion around a shaft core together with a rigid core with a green tire and stopping at a predetermined rotational position. Accordingly, prior to the introduction of the rigid core with the green tire into the vulcanization mold, the phase angle of the rigid core with the green tire relative to the vulcanization mold can be adjusted.

  Therefore, for example, in a rigid core capable of inner heating, the core-side supply / discharge port portion and the mold-side connection port portion can be aligned, and automatic connection at the time of charging can be enabled. In addition, by adjusting the phase angle, for example, the influence of core factors and mold factors that cause deterioration of tire uniformity can be canceled out to reduce the overall effect, thereby improving uniformity. Is possible.

It is sectional drawing of the axial direction which shows the center mechanism of the tire vulcanizer of 1st invention. It is a perspective view which shows a center mechanism notionally. (A), (B) is a top view which shows a rotation position with a stopper. (A), (B) is sectional drawing which shows an automatic attachment / detachment connector pair. It is a disassembled perspective view which shows a rigid core. It is a bottom view of a rigid core.

Hereinafter, embodiments of the present invention will be described in detail.
As shown in FIG. 1, the tire vulcanizer 1 of the present embodiment puts the raw tire T formed on the tire molding surface S of the rigid core 2 into the vulcanization mold 3 together with the rigid core 2. The center mechanism 4 is included.

  In this example, the rigid core 2 can be heated inside by a thermal fluid, and a supply / discharge port portion 5 for supplying and exhausting the thermal fluid into the chamber chamber H of the rigid core 2 is provided on the lower surface thereof. It is done.

  Specifically, as shown in FIG. 5, the rigid core 2 of the present example includes a hollow toroid-shaped core body 60 having a tire molding surface S on the outer surface, and a central hole 60 </ b> H of the core body 60. It includes a cylindrical core 61 to be inserted, and a pair of side wall bodies 62L and 62U arranged on both sides in the axial direction of the core body 60.

  The core body 60 is composed of a plurality (n) of core segments 63 divided in the tire circumferential direction. The core segment 63 includes a first core segment 63A that is inclined in such a direction that both circumferential end surfaces thereof are radially inward and the circumferential width is reduced, and both circumferential end surfaces are circumferentially directed radially inward. The first core segments 63A are inclined in the direction in which the direction width increases and are alternately arranged with the first core segments 63A.

  As shown in FIG. 6, the core segment 63 includes a radially outer outer segment portion 64o constituting the tire molding surface S, and a block-shaped inner segment portion integrally connected to the radially inner side via bolts or the like. 64i. An inner heating chamber chamber H filled with a thermal fluid is recessed in the outer segment portion 64o, and the opening of the chamber chamber H is sealed by the inner segment portion 64i. A supply / exhaust port portion 5 communicating with the chamber chamber H is provided on the lower surface in the axial direction of the inner segment portion 64i. The core body 60 is formed with the same number n of core segments 63 as the number of core segments 63 (in this example, n = 8 is illustrated), and the supply / discharge ports 5 are formed. The mouth portions 5 are formed at equal intervals on the same circumferential line. In addition, in this example, the case where the supply / exhaust port part 5 consists of the intake port part 5i for intake, and the exhaust port part 5o for exhaust_gas | exhaustion is illustrated. Reference numeral 68 denotes guide fins that guide the heat fluid from the supply side to the exhaust side in the chamber chamber H.

  As shown in FIG. 5, the core 61 has a cylindrical shape and is inserted into the central hole 60 </ b> H of the core body 60 to prevent the core segments 63 from moving inward in the radial direction. A side wall 62L is fixed to one end in the axial direction of the core 61, and a side wall 62U is detachably connected to the other end by, for example, screwing or the like. Formed on the outer peripheral surface of the core 61 is a first dovetail joint 65 made of one of an ant groove or an ant tenon extending continuously in the axial direction. In addition, the other of the dovetail grooves or dovetails extending in the axial direction on the inner peripheral surface of each core segment 63 (in this example, the inner peripheral surface of the inner segment portion 64i) and engaging with the first dovetail joint portion 65. A second dovetail portion 66 made of is formed. As a result, the core 61 and the core segment 63 are connected so as to be movable only in the axial direction, and this movement is blocked by the side wall bodies 62L and 62U on both sides. A central shaft portion 67 projects from the outer end surface of each side wall body 62L, 62U in the axial direction. The central shaft portion 67 is, for example, a gripping portion for gripping and moving the rigid core 2 by a conveying device, and the moved rigid core 2 to, for example, a raw tire forming machine, a vulcanizer 1, and a cooler. Functions as a gripping part for mounting.

  Next, the tire vulcanizer 1 includes a vulcanizer body 6 that supports the vulcanization mold 3 and a rigid core 2 that is attached to the vulcanizer body 6 and that has a green tire in the vulcanization mold 3. And a central mechanism 4 to be charged.

  As shown in FIG. 1, the vulcanizing mold 3 includes a lower mold 8 that receives the lower side surface of the green tire T and an upper mold (not shown) that receives the upper side surface portion as in the conventional case. And a tread mold (not shown) for receiving the tread surface. A connection port portion 10 that can be connected to the supply / discharge port portion 5 is formed on the upper surface of the lower mold 8, in this example, the upper surface of the lower bead ring 8A. The number of connection ports 10 formed is the same number (n) as that of the supply / discharge ports 5 and is formed at equal intervals on the same circumferential line. A well-known thermal fluid supply / discharge device (not shown) is electrically connected to the connection port 10 via a thermal fluid flow path 11 a passing through the lower mold 8 and a thermal fluid flow path 11 b passing through the central mechanism 4. The

  As the vulcanizer body 6, the same structure as the conventional one can be suitably employed. In this example, as shown in FIG. 1, the vulcanizer body 6 includes a lower plate 13 that supports the lower mold 8, and an upper plate that can be raised and lowered to support the upper mold and the tread mold (not shown). ) Is shown. The lower plate 13 and the upper plate include a lower mold 8 and a platen plate for heating the upper mold. The lower plate 13 is formed with a central hole 13H that penetrates in the vertical direction and in which the central mechanism 4 is disposed.

  The center mechanism 4 includes a core support shaft portion 15 that can concentrically support the rigid core 2 with a green tire, and the core support shaft portion 15 can be moved up and down and rotated about an axis. Relative angle adjustment for adjusting the phase angle of the rigid core 2 with the raw tire relative to the vulcanization mold 3 by rotating and stopping the core support shaft guide portion 16 to be held and the core support shaft portion 15 around the axis. Means 17.

  The core support shaft portion 15 includes a chuck portion 15B that holds the center shaft portion 67 on an upper portion of a straight shaft-like base body 15A that extends vertically through the center hole 13H. The chuck portion 15B has a so-called ball lock mechanism 14 in this example, and can detachably and concentrically hold the central shaft portion 67 by, for example, remote operation with working air. In addition, in order to rotate the core support shaft portion 15 and the rigid core 2 integrally without a phase shift, the upper end of the chuck portion 15B is engaged with the tapered tapered locking pin 12a or the locking pin 12a. One locking hole 12b (in this example, the locking pin 12a) is formed, and the other lower end (locking hole 12b in this example) is formed at the lower end of the central shaft portion 67.

  The core support shaft portion 15 is moved up and down by lifting means 18 attached to the vulcanizer body 6. The lifting / lowering means 18 of this example includes a pair of downward-facing cylinders 18A fixed to the lower surface of the lower plate 13, and the core support shaft portion 15 is erected on a lifting / lowering plate 18B attached to the lower end of the rod. As the core support shaft 15 moves up and down, the core support shaft 15 receives the rigid core 2 with the green tire from a transport device (not shown) or the like at the raised position, and at the lowered position. Then, the received rigid core 2 with the green tire is put into the vulcanizing mold 3.

  The core support shaft guide portion 16 includes an inner cylinder portion 16A on the radially inner side and an outer cylinder portion 16B on the outer side. The outer cylinder portion 16B has a cylindrical shape fixed to the center hole 13H, and the thermal fluid channel 11b is formed in the outer cylinder portion 16B. The inner cylinder part 16A has a cylindrical shape fixed to the outer cylinder part 16B, and the core support shaft part 15 is slidably movable up and down on its inner peripheral surface and is rotatable around the axis. A bearing member 16A1 is disposed.

  The relative angle adjusting means 17 is supported by the elevating plate 18B and can move up and down integrally with the core support shaft portion 15. Further, the relative angle adjusting means 17 is arranged so that the core support shaft portion 15 is moved around the shaft core together with the rigid core 2 with the green tire before the rigid core 2 with the green tire is put into the vulcanizing mold 3. Rotate and stop at a predetermined rotational position P. Thereby, the phase angle of the rigid core 2 with the green tire with respect to the vulcanization mold 3 is adjusted.

  Specifically, the relative angle adjusting means 17 includes a drive means 20 that rotationally drives the core support shaft portion 15, a rotation amount detection means 21 that detects the rotation amount of the core support shaft portion 15, and a predetermined rotation. And fixing means 22 for fixing the core support shaft 15 at the position P.

  As shown in FIG. 2, the driving means 20 includes a motor 20 </ b> A that is attached to the elevating plate 18 </ b> B and a transmission means 20 </ b> B that transmits the output to the core support shaft portion 15. The transmission means 20B of the present example includes a first gear 20B1 that is integrally rotatable with and concentrically fixed to the lower end portion of the core support shaft portion 15, and meshes with the first gear 20B1 and is output from the motor 20A. And a second gear 20B2 linked to the shaft.

  The rotation amount detection means 21 includes an encoder 21A attached to the lifting plate 18B, and a transmission means 21B that transmits the rotation amount of the core support shaft portion 15 to the encoder 21A. The transmission means 21B of the present example includes a first chain wheel 21B1 that is integrally rotatable and concentrically fixed to the lower end portion of the core support shaft portion 15, and a second chain wheel that is linked to the input shaft of the encoder 21A. 21B2, and the first and second chain wheels 21B1 and 21B2 are connected via an endless string. Then, the motor 20A is controlled based on the rotation amount of the core support shaft portion 15 detected by the rotation amount detection means 21, and the core support shaft portion 15 is stopped at a predetermined rotation position P.

  The fixing means 22 includes a rotating plate 22A and a stopper 22B. The rotating plate 22 </ b> A can be integrally rotated and fixed concentrically to the lower end portion of the core support shaft portion 15. On the outer periphery of the rotating plate 22A, there is a first formed of one of V-shaped locking grooves 23A or one of V-shaped locking projections 23B that can be engaged with the locking grooves 23A (in this example, the locking grooves 23A). One or more engaging portions 24 are arranged. In this example, n first engaging portions 24 having the same number as that of the supply / discharge port portions 5 and the connection port portions 10 are formed at equal intervals in the circumferential direction.

  The stopper 22B includes a second engagement portion 25 formed of the other of the locking groove 23A or the locking projection 23B (in this example, the locking projection 23B), and the second engagement portion 25 as the first engagement portion 25. An advancing / retracting tool 26 such as a cylinder that moves forward / backward in the radial direction toward the engaging portion 24 is provided.

  Therefore, as shown in FIG. 3 (A), the first engagement portion 24 is moved forwardly by the second engagement portion 25 at the rotational position where the first engagement portion 24 faces the second engagement portion 25 in the radial direction. The first engaging portion 24 and the second engaging portion 25 are engaged with each other, and the rotary plate 22A (that is, the core support shaft portion 15) can be fixed. Therefore, the rotation position where the first engagement portion 24 and the second engagement portion 25 face each other in the radial direction means the predetermined rotation position P. In addition, at the predetermined rotation position P, the attachment position of the stopper 22B, the attachment angle of the rotary plate 22A, etc. are appropriately set so that the supply / discharge port portion 5 and the connection port portion 10 coincide with each other. In this example, n rotational positions P exist at an angular pitch of 360 / n degrees. That is, the rotating plate 22A can be fixed at an angular pitch of 360 / n degrees.

  In this example, since the locking groove 23A and the locking projection 23B are V-shaped, the rotating plate 22A can be fixed at an accurate rotational position without being displaced. In particular, even when the position of the rotating plate 22A is slightly deviated at the time of stopping, the fixing means 22 can fix the rotating plate 22A at an accurate rotational position while correcting the position. The fixing means 22 is preferably provided with a sensor for detecting that the first engaging portion 24 and the second engaging portion 25 are fitted. Such detection can be performed, for example, by detecting the position or amount of movement of the second engagement portion 25 when moving forward. The fixing means 22 is controlled based on the rotation amount of the core support shaft portion 15 detected by the rotation amount detection means 21.

  In the tire vulcanizer 1, when the rigid core 2 with the green tire conveyed by the conveying device is received by the core support shaft portion 15, the rigid core side locking hole 12b and the core support shaft portion side are received. It is necessary to engage the locking pin 12a. Therefore, in this example, as shown in FIG. 3B, a stopper 27 for stopping the core support shaft portion 15 at the rotation position Q where the positions of the locking holes 12b and the locking pins 12a coincide with each other. Provided. The stopper 27 has substantially the same configuration as the stopper 22B. Providing such a stopper 27 has the advantage that the rotational position Q of the core support shaft portion 15 can be freely set in accordance with the position of the locking hole 12b on the rigid core side. When the position of the locking hole 12b on the rigid core side can be adjusted, the stopper 27 is eliminated and the locking hole 12b and the locking pin 12a are set to coincide with each other at the rotational position P. You can also.

  Thus, since the center mechanism 4 includes the core support shaft portion 15, the core support shaft guide portion 16, and the relative angle adjusting means 17, the vulcanization die 3 prior to the introduction into the vulcanization die 3 is provided. The phase angle of the rigid core 2 with the green tire can be adjusted. In this example, the supply / exhaust port portion 5 and the connection port portion 10 can be aligned prior to the input, and automatic connection at the time of input is possible.

  The supply / discharge port portion 5 and the connection port portion 10 are formed of a pair of automatic detachable connectors 41 and 42 that can be automatically detachable from each other. As shown in FIG. 4, one connector 41 includes a base tube portion 44 having a center hole 43, a valve shaft 45 that can open and close a valve seat 43 a provided in the center hole 43, and the valve shaft 45. And a spring piece 46 biased toward the valve seat 43a. The base tube portion 44 of this example has a stepped tube shape in which a small diameter connection tube portion 44b is provided in front of a body portion 44a that is attached to an attached object (for example, the core segment 63, the lower mold 8). A seal ring 47 that seals between the body portion 44a and an object to be attached is disposed on the body portion 44a. The center hole 43 includes the valve seat 43a having a cone surface shape having a small diameter toward the front at a front end portion thereof. The valve shaft 45 is slidable back and forth by a head 45a that abuts the valve seat 43a and closes the valve seat 43a, and a holding cylinder 48 that extends rearward from the head 45a and is fixed to the center hole 43. And a shaft portion 45b to be held. The spring piece 46 is extrapolated to the shaft portion 45b and normally closes the valve seat 43a.

  The other connector 42 also has a base tube portion 54 having a center hole 53, a valve shaft 55 that can open and close a valve seat 53a provided in the center hole 53, and biases the valve shaft 55 toward the valve seat 53a. And a spring piece 56. In this example, the base tube portion 54 has a stepped tube shape in which a large-diameter connecting tube portion 54b is provided on the front end side of a body portion 54a that is attached to an attached object (for example, the core segment 63 and the lower mold 8). None, the body portion 54a is provided with a seal ring 57 that seals the body 54a. The center hole 53 includes a cone-shaped valve seat 53a having a small diameter toward the front, a connection hole 53b that is disposed on the front side of the valve seat 53a and fits into the connection cylinder portion 44b, An accommodation hole 53c is provided on the rear side of the seat 53a and accommodates the valve shaft 55. A seal ring 59 that seals between the connection tube portion 44b is disposed in the connection hole portion 53b. The valve shaft 55 is slidable back and forth by a head 55a that contacts the valve seat 53a and closes the valve seat 53a, and a holding cylinder 58 that extends backward from the head 55a and is fixed to the receiving hole 53c. And a projecting pin portion 55c extending forward from the head portion 55a. The spring piece 56 is extrapolated to the shaft portion 55b, and normally closes the valve seat 53a.

  The connectors 41 and 42 are connected by inserting the connecting tube portion 44 b of the connector 41 into the connecting hole portion 53 b of the connector 42. In this connected state (inserted state), the protruding pin portion 55c of the valve shaft 55 of the connector 42 comes into contact with the head portion 45a of the valve shaft 45 of the connector 41, so that both valve shafts 45 and 55 are retracted. The valve seats 43a and 53a can be opened. As a result, the connectors 41 and 42 are electrically connected. In this example, the case where the connector 41 is employed for the supply / exhaust port portion 5 and the connector 42 is employed for the connection port portion 10 is shown, but the reverse is also possible.

  Next, the tire manufacturing method according to the second aspect of the invention includes a vulcanization step of vulcanizing the raw tire T using the tire vulcanizer 1. This vulcanization step includes a relative angle adjustment step of adjusting the phase angle of the rigid core 2 with the green tire with respect to the vulcanization die 3 prior to the introduction into the vulcanization die 3. In this relative angle adjusting step, the relative angle adjusting means 17 is operated to rotate the core support shaft portion 15 around the shaft core together with the rigid core 2 with the green tire and to stop at a predetermined rotational position P. . Thereby, the supply / exhaust port part 5 and the connection port part 10 are aligned, and the automatic connection at the time of insertion is performed.

  In particular, in the relative angle adjustment step of the present example, among the n rotational positions P described above, the rotational position P0 (not shown) that is optimal for the uniformity of the vulcanized tire is being rigid with the raw tire. Child 2 is stopped. Thereby, the uniformity of the vulcanized tire can be improved.

  As described above, the uniformity of the tire formed by the core method includes the raw tire formation factor generated when the raw tire T is formed on the rigid core 2, the shape of the tire molding surface S of the rigid core 2, and the like. There are a core factor due to the above, a mold factor due to the shape of the mold surface of the vulcanizing mold 3 and the like. Therefore, it is possible to improve the uniformity by canceling the influences of these factors and reducing the overall influence.

  Accordingly, among the n rotational positions P, a rotational position P0 that is less affected by the above factors and is optimal for the uniformity is selected, and the rigidity with the raw tire is selected at the optimal rotational position P0. By introducing the child 2 into the vulcanizing mold 3, the uniformity of the tire can be improved.

  The optimum rotational position P0 can be selected by the following method. For example, the phase angle at the time of charging into the vulcanizing mold 3 is set on a trial basis, and a tire is prototyped. From the results of measuring the FV (force variation) of the prototype tire, the raw tire formation factor, core factor, mold factor, vulcanizer factor, etc. are analyzed to determine the phase angle at which FV is the smallest, and n Among these rotational positions P, the one closer to the phase angle at which the FV becomes the smallest is adopted as the optimum rotational position P0.

  Other methods include, for example, RRO on the tire forming surface of the rigid core 2 (hereinafter referred to as “core RRO”) and RRO on the mold surface of the vulcanizing mold 3 before the green tire T is molded. (Hereinafter referred to as “mold RRO”) is measured in advance. Based on the measurement results, the core RRO and the mold RRO are superposed at each rotational position P, and the rotational position when the distribution of the superposed RRO is the most uniform and small over one round is optimal. This is adopted as the correct rotation position P0.

  Note that the rotation time when the core support shaft 15 is rotated from the phase angle (reference position) of the core support shaft 15 when the raw tire T is received from the transport device to the optimum rotation position P0 is shortened. Therefore, it is preferable to change the rotation direction of the core support shaft portion 15 forward and backward depending on whether the rotation angle from the reference position to the optimum rotation position P0 exceeds 180 degrees or not.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.

DESCRIPTION OF SYMBOLS 1 Tire vulcanizer 2 Rigid core 3 Vulcanization mold 4 Center mechanism 5 Supply / discharge port 8 Lower mold 10 Connection port 15 Core support shaft portion 16 Core support shaft guide portion 17 Relative angle adjustment means 20 Drive Means 21 Rotation amount detection means 22 Fixing means 22A Rotating plate 22B Stopper 23A Locking groove 23B Locking protrusion 24 First engagement portion 25 Second engagement portion H Chamber chamber P Rotation position S Tire molding surface T Raw tire

Claims (6)

A tire vulcanizer having a central mechanism for feeding a raw tire formed on the tire molding surface of a rigid core having a tire molding surface on the outer surface into a vulcanization mold together with the rigid core,
The central mechanism is
The rigid core with the green tire can be supported concentrically and moved up and down to receive the rigid core with the green tire at the raised position and the rigid core with the green tire received at the lowered position. A core support shaft that can be put into the vulcanization mold;
A core support shaft guide portion that extrapolates and holds the core support shaft portion so as to be movable up and down and rotatable around an axis;
Prior to the introduction, by rotating the core support shaft portion around the axis and stopping at a predetermined rotational position together with the received rigid core with the raw tire, the rigidity with the raw tire with respect to the vulcanization mold is reduced. A tire vulcanizer comprising a relative angle adjusting means for adjusting the phase angle of the child. The rigid core has an inner heating chamber chamber filled with a thermal fluid, and has a supply / discharge port portion for supplying and exhausting the thermal fluid to the chamber chamber on the lower surface,
The vulcanization mold includes a lower mold provided with a connection port portion connectable to the supply / discharge port portion on an upper surface,
2. The tire vulcanizer according to claim 1, wherein the predetermined rotational position is a position where the supply / discharge port portion coincides with a connection port portion.   The relative angle adjusting means includes a driving means for rotationally driving the core support shaft portion, a rotation amount detecting means for detecting a rotation amount of the core support shaft portion, and a core support shaft portion at a predetermined rotational position. The tire vulcanizer according to claim 1 or 2, further comprising fixing means for fixing.   The fixing means is a first engagement comprising either a V-groove-shaped locking groove or an V-shaped locking protrusion that can be engaged with the locking groove on the outer periphery, and can rotate integrally with the core support shaft portion. A rotating plate having a mating portion; and a stopper having a second engaging portion made of the other of the locking groove or the locking protrusion so as to be movable forward and backward in the radial direction toward the first engaging portion. The tire vulcanizer according to any one of claims 1 to 3. A tire manufacturing method comprising a vulcanization step of vulcanizing a raw tire using the tire vulcanizer according to claim 1,
Prior to the insertion of the rigid core with the green tire into the vulcanization mold, the core support shaft portion is rotated around the shaft core together with the received rigid core with the green tire and at a predetermined rotational position. A tire manufacturing method comprising a relative angle adjustment step of adjusting a phase angle of a rigid core with a green tire with respect to a vulcanization mold by stopping. The rigid core has an inner heating chamber chamber filled with a thermal fluid inside, and has a supply / exhaust port portion for supplying and exhausting the thermal fluid to and from the lower surface on the lower surface,
The vulcanization mold includes a lower mold provided with a connection port portion connectable to the supply / discharge port portion on an upper surface,
And the predetermined rotation position is a position where the supply / exhaust port portion coincides with the connection port portion,
Moreover, the number n of the supply / exhaust port portions and the connection port portions are the same and the same, and the supply / discharge port portions coincide with the connection port portions by being formed at equal intervals on the same circumferential line. While there are n rotational positions,
6. The rigid core with a raw tire is stopped at the rotation position that is optimal for the uniformity of the vulcanized tire among the n rotation positions in the relative angle adjustment step. The tire manufacturing method as described.

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