JP4726165B2 - Tire secondary molding method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tire secondary molding method in which a cylindrical carcass obtained by primary molding of a tire is formed into a toroidal shape, and a bonding member such as a belt or a tread is bonded to the surface thereof to obtain a green tire. More specifically, the present invention relates to a tire secondary molding method in which these steps can be continuously produced on a series of production lines using a strip build method.
[0002]
[Prior art]
Conventionally, as secondary molding of a tire, for example, a bead is set from both ends into a cylindrical carcass obtained by primary molding, and then the carcass is formed in a toroidal shape by shaping from the inside with air or a bladder. Then, there is a molding method in which both ends of the carcass are folded and wound up, and a belt and a tread ring formed separately on a belt drum are transferred and combined.
[0003]
[Problems to be solved by the invention]
Originally, as a method for secondary molding of a tire, a method of directly sticking a sticking member such as a belt or a tread on the surface of a carcass formed in a toroidal shape is preferable in order to improve tire quality. Among these, it is particularly preferable to employ a so-called strip build method in which a strip member such as a tread is wound as the affixing member, but it has been difficult to adopt the above method in the conventional tire secondary molding method. This is because it is difficult to inflate the cylindrical carcass with high dimensional accuracy to the shape of the vulcanized tire depending on the air pressure from the inside by air or a bladder. The same applies to a molding method in which a carcass previously bonded on a drum is expanded in a toroidal shape by air or air pressure from the inside by a bladder.
[0004]
In addition, the conventional molding method requires a carcass molding or primary molding apparatus, a belt drum for forming a belt and a tread ring, and a transfer device for transferring the belt and the tread ring. In the loading device, the belt and the tread ring may be displaced, and the belt and the tread ring may not be accurately combined on the carcass.
[0005]
Further, when the cylindrical carcass is shaped by air, the carcass ply under the bead is displaced by the air pressure, and it may be difficult to maintain a constant bead lock state for a long time.
[0006]
On the other hand, when the carcass is shaped with a bladder, such a problem is unlikely to occur, but it may be difficult to shape the carcass uniformly due to uneven tension of the bladder. In addition, since shaping with such air or bladder uses air pressure, as described above, it is unsuitable to directly apply an affixing member such as a belt or a tread on a carcass shaped in a toroidal shape. is there. In particular, as described above, it was not suitable for the so-called strip build method in which a strip member such as a tread strip is directly wound.
[0007]
An object of the present invention is to allow a reinforcing member such as a belt and a tread to be uniformly and easily attached directly to the carcass surface while the carcass surface formed in a toroidal shape is held in a stable shape, so-called It is also suitable for the strip building method, providing a secondary molding method for tires that enables continuous production of high-quality tires, has excellent productivity, and has a small equipment layout floor space.
[0008]
[Means for Solving the Problems]
As a result of intensive studies to achieve the above object, the present invention provides:
A toroidal carcass in which a bead-locked cylindrical carcass is formed in a toroidal shape from the inner surface to a shape close to a vulcanized tire by radially expanding from the inner surface by a core device, and the inner surface is held by the core device. Shaping shaping process,
A member affixing step for forming a raw tire by sequentially affixing affixing members such as a belt and a tread on the surface of the toroidal carcass;
A tire removing step of taking out a raw tire from the core device,
Each of these processes is composed of continuous processes using the core device as a transfer unit. The affixing member includes a strip member; The tire secondary molding method characterized by this was adopted.
[0009]
Here, the “core device” is defined as a device that expands a cylindrical carcass radially from the inner surface and molds it into a toroidal shape. Further, this core device is arranged between a pair of bead lock drums arranged to face each other in the axial direction, and expands a cylindrical carcass bead-locked by the bead lock drum in a radial direction from the inner surface, An apparatus for forming a toroidal shape, which is a device that forms a shaping molding drum together with the bead lock drum, is desirable. As a particularly preferable core device, the core device is composed of a plurality of core segments arranged radially with a drum axis as a central axis, and each core segment has a radially leading end portion that is expanded with respect to the cylindrical carcass. It is an apparatus having an expanding segment having a surface and a link mechanism for imparting a radial opening / closing motion to the expanding segment. Further, in the present invention, the “sticking member” refers to various members that include a reinforcing member such as a belt and a tread, and are sequentially attached to or from the surface of the toroidal carcass. This is a concept including a strip member.
[0010]
In the shaping molding process, the present invention can form a bead-locked cylindrical carcass in a toroidal shape, and a belt, tread, etc. on the toroidal carcass surface held from the inner surface by the core device. Affixing members (including strip members) can be directly affixed sequentially. In addition, since the carcass formed into a toroidal shape is held while being expanded from the inner surface by the core device, it can be formed into a shape close to a vulcanized tire and maintained for a long time, such as a tread. A so-called strip build method can be employed in which the strip is wound and molded, and high-quality tire molding is possible.
[0011]
In particular, the core device is composed of a plurality of core segments arranged radially with the drum axis as a central axis, and each of the core segments is provided with an expanding surface with respect to the cylindrical carcass at a radial tip. When a molding method using an expansion segment and a forming drum having a link mechanism for giving a radial opening / closing motion to the expansion segment is incorporated in the shaping process, the core device mechanically controls the opening / closing amount of the link mechanism. Since the link mechanism itself can be replaced structurally, various tires having different tire diameters and widths can be efficiently manufactured.
[0012]
In addition, the method of the present invention is notable in that at least the shaping process, the strip build process, and the tire take-out process can be continued on a series of production lines by using the core device as a transfer unit. Is a point. Therefore, in the present invention, it is preferable that moving means for the core device is provided between the steps. Further, it is desirable that a moving means for circulating the core device through each process is provided. As a result, the core device can be optimally transported as a transfer unit, whereby the tire secondary molding can be efficiently and continuously produced as a series of production lines.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a schematic process diagram of a production line for realizing the tire secondary molding method of the present invention. FIG. 2 is a schematic sectional view showing an example of a shaping molding drum.
[0014]
In FIG. 1, PD is a primary molding drum in which a sheet member is wound around a drum and molded into a cylindrical shape. Reference numeral 1 denotes a bead-locked cylindrical carcass CC formed into a toroidal shape by the core device 2, and a shaping molding drum to which the side wall SW is attached, and 3 a surface of the toroidal carcass TC molded by the shaping molding drum 1. A member affixing device for affixing a reinforcing member such as a belt and a strip member such as a tread to the belt, 400 is a toroidal carcass in which a reinforcing member such as a belt and a strip member such as a tread are affixed by the member affixing device 3 A tire take-out device that removes the raw tire GT from the core device 2, and arrows indicate a process flow and a flow of the core device 2.
[0015]
In addition, in the member sticking apparatus 3 in this embodiment, as shown in FIG. 1, the belt sticking process which sticks the 1st belt member 301a and the 2nd belt member 301b sent out to a sheet form on the surface of toroidal-shaped carcass TC. Spiral cap attachment for attaching the core drums 301A and 301B in the (device) and the spiral cap member 302a sent out in the form of a ribbon as a reinforcing member to the surface of the toroidal carcass TC to which the belt members 301a and 301b are attached. A tread base member 303a and a tread cap member 303b, which are similarly fed as ribbons, are attached to the surface of the core drum 302 of the process (device) and the toroidal carcass TC to which the spiral cap member 302a is attached. The core drums 303A and 303B are shown in the tread application process (apparatus).
[0016]
The primary molding drum PD realizes a tire primary molding process, the shaping molding drum 1 realizes a shaping molding process, the member affixing device 3 realizes a strip build process, and the tire take-out device 400 a tire removing process. Is realized. And as above-mentioned, the said member sticking process is divided | segmented into the belt sticking process and the spiral cap sticking process and tread sticking process which comprise what is called a strip building process, and each said process continues as a production line. It consists of processes.
[0017]
Therefore, in the method of the present embodiment, as shown in FIG. 1, the cylindrical carcass TC, which has been bead-locked by the shaping molding process, is expanded from the inner surface thereof in the radial direction by the core device 2 and vulcanized tires are obtained. After forming a toroidal carcass TC that has an inner surface held by the core device 2,
In the member pasting step, various pasting members (belt members 301a and 301b, spiral cap members 302a and tread members 303a and 303b) are sequentially pasted on the surface of the toroidal carcass TC to form a raw tire GT.
In the tire take-out process, the raw tire GT is taken out from the core device 2 to obtain a final raw tire FGT before vulcanization. And these each process is comprised by the continuous process by making the said core apparatus 2 into a transfer unit.
[0018]
Therefore, as shown in FIG. 1, in the method of the present invention, the moving means TM of the core device 2 is provided between the steps, and the core device 2 after the tire is taken out in the tire taking-out step. 1 returns to the molding drum 1 in the shaping molding process again as shown in FIG. 1. In this embodiment, the moving means TM of the core device 2 that circulates through each process is installed, and the core device 2 The secondary molding of the tire proceeds through circulation.
[0019]
In the present embodiment, the toroidal carcass TC is held with the core device 2 locked in the open state, and the step of taking out the raw tire GT unlocks the core device 2 in the open state. And a step of removing the raw tire GT from the core device 2 after unlocking. However, before the step of taking out the raw tire GT, it includes a step of releasing the lock of the core device 2 in the open state, and the raw tire GT after being unlocked in the step of taking out the raw tire GT is removed from the core device 2. There is no problem even if it is taken out.
[0020]
In the conventional construction method, from carcass shaping to tread pasting on the same drum, by adopting the method as described above, in the present invention, only the design of the core device 2 is adjusted, for example, By using one or more types of core devices with different expansion diameters and / or expansion widths, small or large quantities of tires of different sizes on the same production line Continuous molding becomes possible. In other words, it becomes possible to flexibly and efficiently cope with the production environment from a small amount of many varieties to a large amount of small varieties.
[0021]
FIG. 2 is a schematic sectional view showing an example of a shaping molding drum for realizing the method of the present invention. In FIG. 2, reference numeral 1 denotes a shaping molding drum, with the drum shaft Xa as the central axis, the upper cross section shows a state before molding, and the lower cross section shows a state after molding. Further, in the lower cross section, the right cross section across the Yc-Yc line of the drum center portion 10 is a schematic cross sectional view showing the winding state of the end portion of the carcass CC, and the left cross section is the end portion of the carcass CC. It is a schematic sectional drawing which shows the state after winding up (or before). FIG. 3 is an enlarged schematic cross-sectional view of a main part of the shaping molding drum. 4 is a schematic cross-sectional view of the drum center portion 10 in FIG. 2 taken along line Yc-Yc. FIG. 5 is a schematic cross-sectional view taken along the line Yb1 and a line Yb2 of the bead lock portion 11 in FIG. 2, with the right side being a schematic cross-sectional view taken along the line Yb1 and the left side being a schematic cross-sectional view taken along the line Yb2. 6 is a schematic sectional view taken along line Yt1 and a schematic line sectional view taken along line Yt2 of the turn-up portion 12 in FIG. 2. The schematic sectional view taken along line Yt1 is shown by a solid line, and the schematic sectional view taken by line Yt2 is shown by a virtual line.
[0022]
As shown in FIGS. 2 and 3, the shaping molding drum 1 has a core device 2 installed in the drum center portion 10, and the bead lock portions 11, 11 on both the left and right sides sandwich the core device 2. A pair of beadlock / turnup portions 101 and 102 are provided opposite to each other in the axial direction. Note that CC indicated by an imaginary line is a cylindrical carcass set between the beadlock / turnup portions 101 and 102.
[0023]
As shown in FIG. 4, the core device 2 includes a plurality of core segments 210 that are radially arranged with the drum axis Xa as a central axis. Each core segment 210 has an expansion segment 211 having an expansion surface 212 with respect to the cylindrical carcass CC at the radial tip, and a link mechanism 213 that gives the expansion segment 211 a radial opening and closing motion. ing. In particular, in this embodiment, the expansion surface 212 of the core segment 210 is designed by the link mechanism 213 to have a reduced diameter smaller than the inner diameter of the cylindrical carcass CC when fully closed, and to have a toroidal enlarged diameter when fully opened. ing. As shown in FIG. 4, the core device 2 includes a small-diameter core segment 210a having a large link with a large link lever ratio and a large-diameter medium segment having a small link with a smaller link lever ratio than the small-diameter segment. The child segments 210b are alternately arranged. Further, the expanded surface 212 is also a crescent-shaped expanded surface 212b in the core segment 210b, whereas the expanded surface 212a of the core segment 210a has a quadrangular cross section, and its end is the above-mentioned The end of the expanded surface 212b is inclined so that a continuous outer circumferential surface can be formed. Therefore, as shown in FIG. 4, the small-diameter core segment 210a and the large-diameter core segment 210b are integrated with each other at the toroidal enlarged diameter Re, and the expanded surface 212 forms an outer peripheral surface 212c continuous with the circumference. To do. In FIG. 4, 212B is a diagram showing an expansion process of the expansion surface 212b of the core segment 210b, and 212A is a diagram showing an expansion process of the expansion surface 212a of the core segment 210a. These follow the expansion of the expansion surface 212b of the preceding large-diameter core segment 210b, so that the small-diameter core segment 210a having a large link lever ratio is tracked and integrated at the toroidal expansion diameter Re. Show. When the core segment 210 is closed (reduced), the process reverses to the above process, and the small-diameter core segment 210a having the large link lever ratio is first contracted, and the medium-diameter medium having the small link lever ratio is reduced. The child segment 210b is subsequently reduced.
[0024]
As shown in FIGS. 2 and 3, the link mechanism 213 employs a structure that opens and closes in the radial direction in synchronization with the movement of the connecting sleeves 31 and 32 that are displaced in the axial direction. The connecting sleeves 31 and 32 are mechanically displaceable in the axial direction by a screw mechanism inside the main shaft body, but are further designed to be displaceable in the axial direction by a pair of first cylinders 80. . As can be understood from FIGS. 2 and 3, a stopper for adjusting the approach distance between the connecting sleeves 31 and 32 in the axial operation line of the connecting sleeves 31 and 32 by the first cylinder 80 or the like (see FIG. 2). It is possible to determine the opening diameter of the core segment 210. The opening diameter of the core segment 210 can be adjusted by opening and closing the link mechanism 213 driven by a motor. Further, the opening / closing mechanism itself of the core segment 210 can be driven by a motor to adjust the opening diameter of the core segment 210. Moreover, it is also possible to adjust the opening diameter and width of the core device 2 by attaching a cover rubber that can be attached to the expansion surface 212 of the expansion segment 211. The segment width of the core segment 210 can be adjusted by exchanging the segments or adopting a structure in which the segments are slid in the axial direction.
[0025]
2 and 3, the core device 2 includes a pair of sliders 311 and 312 that approach or leave the surface of the cylindrical main shaft body 4 in the axial direction. A pair of links 213a and 213b that apply a radial opening / closing motion to the link mechanism 213 in synchronization with the movement of the sliders 311 and 312 toward or away from each other are coupled (supported) to the sliders 311 and 312 respectively. ing. Further, as shown in the figure, these sliders 311 and 312 are connected to the connecting sleeves 31 and 32 and slide on the cylindrical main shaft body 4 together with the connecting sleeves 31 and 32 to be displaced in the axial direction. It is configured as follows. Therefore, in this drum, the sliders 311 and 312 move the surface of the cylindrical main shaft body 4 in the axial direction in accordance with the movement of the connecting sleeves 31 and 32 moving toward and away from each other in the axial direction on the surface of the cylindrical main shaft body 4. Similarly, the link mechanism 213 opens and closes in the radial direction according to the movement, and the expansion surface 212 of the core segment 210 expands or contracts in the radial direction according to the opening and closing operation.
[0026]
On the connecting sleeves 31 and 32, as shown in FIGS. 2 and 3, bead lock / turn-up portions 101 and 102 are also attached. Accordingly, the beadlock / turnup portions 101 and 102 also approach or separate from each other in accordance with the movement of the connecting sleeves 31 and 32 sliding on the cylindrical main shaft 4 and moving toward or away from each other in the axial direction. The bead portions CB1 and CB2 of the cylindrical carcass CC spanned between the lock and turnup portions 101 and 102 are configured to be close to each other according to the radial opening of the link mechanism 213. Further, second cylinders 51 and 52 are provided outside the connecting sleeves 31 and 32, and are displaced in the axial direction together with the connecting sleeves 31 and 32, and further independent of the connecting sleeves 31 and 32. It can be displaced in the axial direction. In addition, the second cylinders 51 and 52 are provided with second link mechanisms 111 and 112 so that the bead lock and turnup portions 101 and 102 described above can be slightly opened and closed in the radial direction in both bead lock portions 11 and 11. The second cylinders 51 and 52 and the bead locks 11 and 11 are connected. Therefore, since the bead locks 11 and 11 can be opened and closed in the radial direction by further displacing the second cylinders 51 and 52 in the axial direction with respect to the connecting sleeves 31 and 32, in this embodiment, The core segment 210 opens and closes in response to the approach or separation of the sleeves 31 and 32, and the bead lock and turn-up portions 101 and 102 open and close in the radial direction while approaching or separating from the core segment 210. In addition, 11a and 11b are bead receiving parts, respectively, and 110a and 110b are bead receiving grooves.
[0027]
In particular, in the present embodiment, as shown in FIG. 5, the bead receiving portion 11b of the beadlock / turnup portion 102 also has a small diameter having a large link 112a having a large link lever ratio, similar to the core segment 210 described above. The bead lock segments 102a and the large diameter bead lock segments 102b having the small links 112b having a smaller link lever ratio than the small diameter bead lock segments 102a are alternately arranged, and are arranged radially around the drum axis Xa. Yes. Therefore, as shown in FIGS. 2 and 3, the connecting sleeve 32 advances in the direction of the core device 2 from the position shown in the upper half section from the drum axis Xa to the position shown in the lower half section, Further, when the second cylinder 52 advances in the same direction toward the core device 2, the bead lock segment 102a, from the position shown in the right cross section of FIG. 5 to the position shown in the left cross section by the opening operation of the second link mechanisms 111 and 112, The bead receiving portions 11b1 and 11b2 that are continuous as the circumferential surface are configured by being pushed up and expanded. The same applies to the bead receiving portion 11a of the beadlock / turnup portion 101.
[0028]
Further, as shown in FIGS. 2 and 3, the drum can be provided with an independent axial movement that is different from the connecting sleeves 31 and 32, like the second cylinders 51 and 52. Third cylinders 61 and 62 are provided. The third cylinders 61 and 62 are provided with lift fingers 71 and 72 that wind up the cylindrical carcass CC installed in the bead lock / turn-up portions 101 and 102 from both sides of the bead core. . In particular, in the present embodiment, as shown in FIG. 6, a plurality of lift finger segments 720 having a pair of rotating rollers 721 and 721 attached to the distal end portions are axially supported on the third cylinder 62 around the drum axis Xa. Attached. In this way, when the third cylinders 61 and 62 approach each other in the direction of the core device 2, the plurality of lift finger segments 720 located at the position of the solid line in FIG. It moves to the position, hits both ends of the cylindrical carcass CC installed in the beadlock turn-up portions 101, 102, and moves up in the direction of lifting both ends in the radial direction and turning up to perform turn-up operation. . The above turn-up action can also be achieved by a bladder.
[0029]
Since this shaping drum has the above-described configuration, a bead is driven from both ends of the cylindrical carcass CC, and the carcass CC is inserted into a bead receiving portion 11b (bead bead) of the bead lock segment 102b in the bead lock / turn-up portion 102. After the bead is locked in the receiving groove 110b) (the same applies to the bead lock / turn-up portion 101), the pressure is reduced (for example, 0.5 kgf / cm). ² ) Air is introduced, and the bead lock / turn-up portions 101 and 102 are moved closer to each other in the axial direction. As a result, the core segment 210 is expanded. After the core segment 210 is fully opened, air blow is performed to move the bead lock / turn-up portions 101 and 102 outward in the axial direction. Then, high pressure (eg 1.2 kgf / cm ² ) Air is introduced, the third cylinders 61 and 62 are brought close to each other in the axial direction, and both ends of the carcass CC are bent and wound up according to the operation of the bead lock segment 102b. Then, after affixing the sidewall, affixing members such as a belt and a tread are adhered in order. The same applies to the bead lock turn-up unit 101 (not shown).
[0030]
Therefore, in the shaping molding drum of this embodiment, the second cylinders 51 and 52 and the third cylinders 61 and 62 move in the axial direction in synchronization with the movement of the connecting sleeves 31 and 32 in the axial direction. Opening and closing, opening and closing of the beadlock / turnup portions 101 and 102, and lifting or lifting of the lift finger segment 720 are continuously performed, and a toroidal carcass having good dimensional accuracy can be continuously formed. . Furthermore, since the toroidal carcass is held in the expanded state by the core segment 210 from the inside, as described above, the core device is used as a transfer unit, and after the strip build process, Affixing members such as belts and treads are directly affixed from above. As shown in FIG. 1, the carcass or green tire GT formed in this way is reduced in the radial direction in the tire take-out device 400 so that the inner surface holding state of the core device 2 is maintained. After the release, the raw tire GT is removed from the core device 2 to obtain a high-quality toroidal final raw tire FGT with good dimensional accuracy.
[0031]
An air outlet hole (not shown) through which air can be fed into the bead-locked carcass is provided at the opening / closing position of the core segment 210 in the radial direction. Thus, after bead-locking the cylindrical carcass, low-pressure air can be inserted into the carcass through this air outlet hole while bringing the beads into place, and the core segment 210 that expands thereby, and the carcass extending in a toroidal shape Rub between the two can be prevented. Further, when the core segment 210 is fully opened, by blowing air from the air outlet hole into the toroidal carcass, a bead interval can be widened to form a toroidal carcass without sagging.
[0032]
Therefore, in this molding method, after the cylindrical carcass is bead-locked, low-pressure air is inserted into the carcass through the air outlet hole while moving the bead, and then the core segment described above is gradually opened and the air is fully opened. In this molding method, air is blown from the outlet hole to widen the bead interval to form a toroid.
[0033]
The air outlet hole is preferably provided at the opening / closing position of the core segment 210 in the radial direction. Specifically, in the drum, an air introduction path is provided inside the cylindrical main shaft body 4 and the core segment 210 is provided. It is desirable to provide an air outlet hole communicating with the air introduction path at the radial opening / closing position 210.
[0034]
By the way, although the tire forming drum described above is not limited, it is constituted by a main shaft body 4 that can be connected in the axial direction so that it can be formed in a continuous cylindrical shape, and the main shaft body 4 is a pair of bead locks. -It has the structure provided with the core apparatus between the turn-up part and a pair of bead lock * turn-up part. Specifically, in this embodiment, as shown in FIG. 7, the main shaft body 4 is constituted by a left main shaft body 4 a and a right main shaft body 4 b, and in the axial direction in the vicinity of the left bead lock portion 11. Can be connected and separated. Then, the connecting shaft 400 that is provided in the axial direction in the main shaft body 4 and has a structure that is integrated with the main shaft body 4 is engaged in the axial direction with the clutch mechanism or released, thereby releasing the main shafts 4a and 4b. It is a structure that establishes connection and separation.
[0035]
By the way, the molding drum 1 described above has a configuration in which a continuous cylindrical main shaft body 4 is provided with a pair of bead lock drums and a core device 2 between the pair of bead lock drums. However, in order to realize the method of the present invention, for example, as shown in FIG. 8, the main shaft body is attached with the main shaft body 40 to which the core device 2 is attached and the bead lock / turn-up portions 101 and 102. It is desirable that the main shaft bodies 41 and 42 be configured to be detachably connected to each other.
[0036]
That is, as shown in FIG. 8, the main shaft body 40 to which the core device 2 is attached is a cylinder including an inner hole 401 that can penetrate one main shaft body 42 in the axial direction. Further, the other main shaft body 41 is provided with a fitting groove 411 for receiving the tip portion 421 of the main shaft body 42. By doing so, the main shaft body 42 to which the bead lock / turn-up portion 102 is attached is inserted into the inner hole 401 of the main shaft body 40 to which the core device 2 is mounted, and the bead lock / turn-up portion 101 is inserted. The cylindrical carcass can be formed into a toroidal shape by connecting and integrating with the other main shaft body 41 to which is attached. Further, after the molding, the core device 2 is mounted by pulling out the main shaft body 42 to which the bead lock / turn-up portion 102 is attached from the inner hole 401 of the main shaft body 40 to which the core device 2 is mounted. The main shaft body 40 can be removed from the main shaft bodies 41 and 42 to which the bead lock and turnup portions 101 and 102 are attached. As a result, the toroidal carcass TC (or raw tire) held on the inner surface by the core device 2 can be transferred alone along with the main shaft body 40, and the core device 2 can be optimally transported as a transfer unit. It becomes possible and productivity is greatly improved.
[0037]
In realizing the method of the present invention, the configuration of the various drums is not limited. For example, in FIG. 1, a member is wound around a drum with a primary molding drum PD and formed into a cylindrical shape, and then the cylindrical carcass CC bead-locked with a shaping molding drum 1 is formed into a toroidal shape with a core device 2. Both the molding and the side wall SW are affixed. The first molding drum PD completes the above-described side wall SW affixing, and then the member affixing device 3 uses a belt, a tread. A pasting member such as a tread strip (including a strip member such as a tread strip) can also be pasted. In this case, the shaping molding drum 1 is necessary, but the lift fingers 71 and 72 are not necessary for this drum. The method of the present invention can further include various steps. What is important is a method of molding a secondary tire using a core device that expands in a toroidal shape as a moving unit, and all methods including this element are included in the present invention.
[0038]
【The invention's effect】
The present invention is to form a bead-locked cylindrical carcass in a toroidal shape from the inner surface to a shape close to the vulcanized tire by radially expanding the core device, and winding up both ends of the carcass, A shaping molding step for obtaining a toroidal carcass whose inner surface is held by the core device, and a sticking member (including a strip member) such as a belt and a tread are sequentially attached to the surface of the toroidal carcass to form a raw tire. A member affixing step and a tire take-out step for taking out a raw tire from the core device, and each of these steps is a tire secondary molding method configured by a continuous process using the core device as a transfer unit. Therefore, belts, treads and other pasting members, especially belts and other seats on the carcass surface formed in a toroidal shape to a shape close to that of vulcanized tires. Jobutsu and, by attaching the strip member, such as a tread strip can be directly continuously produce high quality tires at high productivity.
[0039]
In addition, as described above, since each process is a method configured by continuous processes using the core device as a transfer unit, the installation of the facility is space-saving compared to the conventional installation as an individual device, Costs can be reduced. In addition, if the same inch is used, a plurality of sizes of tires can be produced simultaneously by installing different size core devices. In addition, if the core device is automatically replaced, the size can be changed instantaneously, and this is an epoch-making tire molding method that has not existed before.
[Brief description of the drawings]
FIG. 1 is a schematic process diagram of a production line for realizing a tire secondary molding method of the present invention.
FIG. 2 is a schematic sectional view showing an example of a shaping molding drum.
FIG. 3 is an enlarged schematic cross-sectional view of a main part of the shaping molding drum.
4 is a schematic cross-sectional view of the drum center portion in FIG. 2 taken along line Yc-Yc.
5 is a schematic cross-sectional view taken along line Yb1 and a schematic cross-sectional view taken along line Yb2 of the bead lock portion in FIG. 2;
6 is a schematic cross-sectional view taken along line Yt1 and a schematic cross-sectional view taken along line Yt2 of the turn-up portion in FIG.
7 is an enlarged schematic cross-sectional view of a main part showing a connection / separation structure of the main shaft body in FIG. 1. FIG.
FIG. 8 is a schematic sectional view showing another example of a shaping molding drum.
[Explanation of symbols]
1 Shaping molding drum
2 Core device
3. Member pasting device
301 Core drum for belt application process
302 Core drum for spiral cap process
303 Core drum for tread application process
400 Tire take-out device
CC cylindrical carcass
TC toroidal carcass
GT raw tire
TM transportation means

Claims (7)

A toroidal carcass in which a bead-locked cylindrical carcass is formed in a toroidal shape from the inner surface to a shape close to a vulcanized tire by radially expanding from the inner surface by a core device, and the inner surface is held by the core device. Shaping shaping process,
A member affixing step for forming a raw tire by sequentially affixing affixing members such as a belt and a tread on the surface of the toroidal carcass;
A tire removing step of taking out a raw tire from the core device,
Each of these processes is comprised by a continuous process by making the said core apparatus into a transfer unit, and a sticking member contains a strip member, The secondary molding method of the tire characterized by the above-mentioned. Member attaching process is divided into a belt attaching step and the spiral cap attaching step and the tread attaching step, the tire of claim 1 Symbol mounting, characterized in that said steps are composed of a continuous process continuing as a production line Secondary molding method. The tire secondary molding method according to claim 1 or 2, wherein means for moving the core device is provided between the steps. The tire secondary molding method according to claim 3, wherein the core device is provided with moving means for circulating each process. The toroidal carcass is held with the core device locked in the open state, and the green tire taking-out process includes a step of unlocking the open state of the core device, and a step of releasing the green tire after unlocking. The tire secondary molding method according to any one of claims 1 to 4 , further comprising a step of taking out from the slave device. The toroidal carcass is held by locking the core device in the open state, and includes a step of releasing the lock of the core device in the open state before the step of taking out the raw tire. The tire secondary molding method according to any one of claims 1 to 4 , wherein the unlocked green tire is taken out from the core device in a process. A tire in which tires of different sizes are molded on the same production line by a method according to any one of claims 1 to 6 , using a plurality of types of core devices in which at least one of an expanded diameter and an expanded width is different. Secondary molding method.

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