JP2010158838A - Tire molding apparatus and tire manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To mold an unvulcanized tire by simultaneously winding rubber extruded from a plurality of extruders onto an object to be molded while preventing the rubber from being crosslinked. <P>SOLUTION: Rubber strips GA and GB are supplied simultaneously from a plurality of the extruders to the object H to be molded and wound to mold the unvulcanized tire. The extrusion upper limit speed of each extruder is compared, and the object H is rotated at a rotation speed corresponding to the lowest extrusion upper limit speed, so that the rubber strips GA and GB are supplied from each extruder and wound. Each rubber strip GA or GB is laminated to form each rubber member. With the end of the supply of the rubber strip GA by the extruder of the lowest extrusion upper limit speed and in accordance with the lowest extrusion upper limit speed among the extruders supplying the rubber strip GB, the rotation speed of the object H and the extrusion speed of the rubber strip GB by each extruder are changed. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a tire forming apparatus and a tire manufacturing method for forming an unvulcanized tire by simultaneously winding rubber extruded from a plurality of extruders around a rotating molded body.

  In general, a pneumatic tire is manufactured by vulcanizing and molding an unvulcanized tire by sequentially arranging each tire constituent member made of unvulcanized rubber or the like on a molded body with a tire molding apparatus. . Also, at the time of molding this unvulcanized tire, conventionally, rubber extruded from an extruder is spirally wound around a rotating molded body and laminated to form a rubber member for each part of the tire such as tread rubber. Has been done.

  By the way, in such a conventional tire molding apparatus, the molded body is moved to each installation position of a plurality of extruders each time, and a rubber member is sequentially formed on the molded body at each position to mold an unvulcanized tire. It is common. For this reason, in this conventional apparatus, it is necessary to repeat the movement and rotation of the molded body every time a rubber member is formed, and accordingly, time and energy are consumed, molding time is increased, and energy is consumed. Cost tends to increase. In order to prevent the temperature inside the extruder from rising and scorching of the internal rubber during standby until the next rubber lamination, a so-called emptying operation is performed in which the rubber is pushed out from the extruder during the standby. There is also a need. As a result, it becomes necessary to perform the kneading work again by kneading the empty rubber again with an extruder, and accordingly, rubber waste is generated and the amount of rubber to be discarded may increase.

  In contrast, conventionally, a rubber strip extruded from a plurality of extruders is wound around a molded body at the same time to form a tread rubber, thereby improving the efficiency of molding an unvulcanized tire and reducing the molding time and energy cost. A molding apparatus is known (see Patent Document 1).

  However, in this conventional tire molding apparatus, depending on which extruder the extrusion speed of the extruder is adjusted to, for example, the extrusion speed of some of the extruders becomes too high, the rubber is excessive in the rubber. Heat is generated and the rubber may be heated to the crosslinking temperature to cause crosslinking. In particular, when forming different rubber members or extruding different types of rubber, it is difficult to adjust the extrusion speed between the extruders, and there is a greater possibility that the rubber will be crosslinked.

JP 2004-25535 A

  The present invention has been made in view of such a conventional problem, and its object is to simultaneously unwrap rubber extruded from a plurality of extruders around a molded body while preventing crosslinking of the rubber. It is possible to form a vulcanized tire, reduce the molding time and energy cost of the unvulcanized tire, and reduce the rubber reworking operation and the generation of rubber scraps by an extruder.

The present invention comprises a plurality of extruders that can extrude rubber and simultaneously supply the object to be molded, and a winding means that wraps the rubber supplied from the plurality of extruders around the object to be rotated. A tire molding apparatus for forming an unvulcanized tire by winding each rubber supplied to a body at the same time, and means for storing an upper limit speed of extrusion of each rubber by a plurality of extruders, and supplying the rubber to a molded body Means for obtaining and comparing the extrusion upper limit speed of each extruder, means for determining the slowest extrusion upper limit speed from the compared extrusion upper limit speed, and rotating the molding at a rotation speed corresponding to the determined extrusion upper limit speed Means, means for supplying rubber from each extruder to the rotating molded body, and the slowest extrusion in each extruder that supplies rubber following the end of rubber supply by the extruder at the determined upper limit extrusion speed To upper speed limit Flip it, characterized in that and a speed changing means for changing the extrusion rate of the rubber by the rotational speed and the extruder the molded body.
The present invention also relates to a tire manufacturing method for forming an unvulcanized tire by extruding rubber from a plurality of extruders, supplying the rubber to a molded body, and simultaneously winding each rubber around a rotating molded body. The process of obtaining and comparing the rubber extrusion upper limit speed of each extruder for supplying rubber to the body, the process of determining the slowest upper extrusion speed limit from the compared extrusion upper limit speed, and the rotation according to the determined extrusion upper limit speed The process of rotating the molded body at a speed, the process of supplying and winding rubber from each extruder to the rotating molded body, and the rubber supply by the extruder with the determined upper limit extrusion speed, It has a speed changing step of changing the rotation speed of the molded body and the extrusion speed of rubber by each extruder according to the slowest upper limit speed of extrusion in each extruder to be supplied.

  According to the present invention, an unvulcanized tire can be formed by simultaneously wrapping rubber extruded from a plurality of extruders around a molded body while preventing the rubber from being crosslinked. In addition, it is possible to reduce the amount of rubber scraping and rubber waste generated by the extruder.

It is a principal part top view which shows typically schematic structure of the tire shaping | molding apparatus of this embodiment. It is a principal part side view which extracts and shows a support body and one extruder from FIG. It is a flowchart which shows the winding procedure of the rubber strip by the tire shaping | molding apparatus of this embodiment. It is principal part sectional drawing which shows the state of winding of a rubber strip typically. It is a graph which shows the change of the rotational speed of a to-be-molded body.

Hereinafter, an embodiment of a tire forming device and a tire manufacturing method of the present invention will be described with reference to the drawings.
The tire molding apparatus of the present embodiment is a rubber member that forms each part of a tire, such as a tread rubber, a sidewall rubber, or a rubber chafer, by simultaneously winding each rubber supplied from a plurality of extruders around a rotating molded body. To form an unvulcanized tire. At this time, in the tire molding apparatus, the rotational speed of the molded body and the extrusion speed of the rubber are sequentially changed according to the extrusion speed of the rubber by each extruder.

FIG. 1 is a main part plan view schematically showing a schematic configuration of the tire molding apparatus.
As shown in the figure, the tire molding apparatus 1 includes a support 10 having an axis disposed horizontally, and a plurality (four in this case) of extruders 21, 22, 23, and 24 (in the drawing, the front end). And a control device 40 that controls the entire apparatus. Further, the tire molding apparatus 1 includes a transport means (not shown) for the support 10, thereby transporting the support 10 and moving between the extruders 21, 22, 23, and 24 from the outside (in the drawing). The rubber is wound by the arrow S1), and moved to the outside in the reverse direction after the winding (arrow S2 in the figure).

  The support 10 is a means for supporting the molded body H so as to be rotatable around the axis when molding an unvulcanized tire. For example, the support 10 can be expanded or contracted according to a cylindrical molding drum or an inner shape of the unvulcanized tire. And a rigid core having an outer shape. Here, the support 10 is composed of a molding drum that can rotate around an axis, and on the outer peripheral side thereof, tire constituent members and rubber from the extruders 21, 22, 23, and 24 are sequentially arranged, laminated, and the like to be molded. The body H is formed, and the molded body H is held concentrically in an expanded state. In addition, the support 10 includes a rotation unit (not shown) that can continuously change the rotation speed (the number of rotations), which includes a drive source such as a motor, a transmission mechanism for the rotational power, and the like. The support body 10 is rotationally driven by this, and rotates the molding H at a predetermined rotation speed around the axis (arrow K in the figure), stops at an arbitrary rotation angle, and continuously rotates the rotation speed. Change.

  Here, the to-be-molded body H is an object on which rubber from the extruders 21, 22, 23, and 24 is wound at the time of molding an unvulcanized tire. These are vulcanized tires, work-in-progress products, and intermediate molded products. Alternatively, when the rubber from the extruders 21, 22, 23, and 24 is directly wound on the support 10, a molding drum or a rigid core constitutes the molded body H.

  The plurality of extruders 21, 22, 23, and 24 are rubber supply means that extrude the rubber that is wound around the molded body H and that can be supplied to the molded body H at the same time. These are arranged at predetermined positions corresponding to the winding positions of the rubber. In addition, the extruders 21, 22, 23, 24 have the caps 21A, 22A, 23A, 24A attached to a rubber extrusion tip (rubber discharge port) via an extrusion head, a gear pump, etc. (not shown), Each is disposed so as to face the outer peripheral portion of the molded body H. These extruders 21, 22, 23, and 24 operate independently of each other, and extrude unheated rubber that has been heated and kneaded at a predetermined speed from the openings of the caps 21A, 22A, 23A, and 24A, respectively, It is molded into a predetermined cross-sectional shape corresponding to the above. As a result, the extruders 21, 22, 23, and 24 supply a continuous extruded rubber H at a predetermined speed while forming a long extruded rubber having a ribbon shape, a strip shape, a strip shape, or the like. . At that time, each of the extruders 21, 22, 23, and 24 is configured to be able to continuously change the rubber extrusion speed (extrusion length, extrusion amount, etc. per unit time), and each of the predetermined extrusion speeds set in advance. While extruding rubber, each extrusion speed is continuously changed.

  In addition, the extruders 21, 22, 23, and 24 can start and stop rubber extrusion from the caps 21A, 22A, 23A, and 24A at a predetermined timing based on a control signal from the control device 40. It has become. Each extruder 21, 22, 23, 24 includes, for example, a means for traveling on a rail laid on the floor surface, a means for moving in the axial direction, the tire radial direction, and the like along the outer surface of the molded body H, In addition, means (not shown) for changing the distance between the bases 21A, 22A, 23A, 24A and the molding body H by approaching and separating from the molding body H is provided. As a result, the extruders 21, 22, 23, and 24 move in each direction independently of each other in accordance with the rubber extrusion speed, the winding position around the molded body H, and the like to rotate the extruded rubber. It supplies to the predetermined position of the molded object H. The plurality of rubbers supplied in this way are wound around the respective winding positions of the body H to be rotated by the winding means provided for each of the extruders 21, 22, 23, and 24.

FIG. 2 is a side view of the main part of the support 10 and one extruder 21 extracted from FIG. 1 and schematically showing each stage of rubber winding in order. The other extruders 22, 23, and 24 are each provided with a winding means 30 similar to that of the extruder 21 described below, and perform the winding operation in the same manner.
As shown in the figure, the winding means 30 has a pair of rollers 31 and 32 supported so as to be rotatable about an axis, and a rotation driving means (not shown) for the extruder 21 and the support 10. It is arranged between. At that position, the winding means 30 causes the rubber (here, rubber strip) G supplied from the extruder 21 to pass between a pair of rotating rollers 31, 32, and is formed on the molding H by one roller 31. Wrap.

  The rollers 31 and 32 have a cylindrical shape or a disk shape, and a lower roller 31 having a larger diameter is disposed near the outer surface of the support 10, and an upper roller 32 having a smaller diameter is disposed above the lower roller 31. Are arranged to face each other with a predetermined interval between the outer peripheral portions. These rollers 31 and 32 (see FIG. 2A) are winding (lamination) and rolling rollers for the rubber strip G, respectively, and are supported with their axes parallel to each other, and one side between them (the right side in the figure) The rubber strip G pushed out from the base 21A is guided and continuously supplied to the rubber inlet side.

  The winding means 30 rotates these rollers 31 and 32 in opposite directions in synchronization with each other (see arrows in the figure), rolls the supplied rubber strip G between the outer peripheral portions of the rollers 31 and 32, It is formed in a predetermined cross-sectional shape with a thickness corresponding to the outer peripheral space. Subsequently, the winding means 30 guides the rubber strip G that has passed between the rollers 31 and 32 to the lower roller 31 side for winding, and holds the rubber strip G by the rotating lower roller 31 to the predetermined object H. Is moved to the winding position of, and pressed against the outer surface of the molding body H that rotates in conjunction with the wrapping position to be crimped. In this way, the winding means 30 attaches the rubber strip G to the molded body H, for example, the outer surface of the support 10 or the lower rubber strip G or the already arranged tire constituent member, and continuously in the tire circumferential direction. A rubber member such as a tread rubber having a predetermined shape is formed by being wound around and spirally laminated.

  At this time, in the tire molding apparatus 1, the extruder 21 is moved so that the rubber extrusion tip portion of the base 21A is disposed at a separation position (steady winding position) T that is a predetermined distance away from the winding means 30. The rubber strip G is extruded from the machine 21 and supplied. Further, the rotational speed (winding speed) of the rollers 31 and 32 is relatively increased with respect to the extrusion speed of the extruder 21 to provide a predetermined speed difference, and tension is applied to the rubber strip G between them. Then, the rubber is stretched and deformed. In this manner, the tire molding apparatus 1 applies the rubber strip G to be supplied to a predetermined position on the outer surface of the molded body H that is rotated by the lower roller 31 while being rolled while being stretched by the winding means 30. This pasting is continuously performed by gradually moving the winding means 30 together with the extruder 21, and the rubber strip G is wound around the molding H while being partially overlapped, and is bonded to each other, thereby laminating one or more layers. Etc. to form a rubber member having a predetermined shape.

  Further, the tire molding apparatus 1 moves the extruder 21 toward the winding means 30 side (see FIG. 2B) in accordance with the end of the formation of the rubber member, thereby bringing the base 21A and the winding means 30 into a predetermined proximity. It approaches to the position (cutting position) S, and the extrusion of the rubber strip G by the extruder 21 is stopped. In this state, the rubber strip G that has been pushed out to the base 21A is pulled by the winding means 30 that continues the winding operation in accordance with the winding around the molded body H, and tension is applied to the rubber strip G in the same range. Append. By this tension, the rubber strip G is cut so as to be torn between the base 21A and the winding means 30 that are close to each other, and the rubber strip G remaining on the tip end side of the base 21A is shortened (reduced). On the other hand, the rubber strip G on the winding means 30 side is stuck to the molded body H up to the cut end while being rolled by the winding means 30.

  The tire molding apparatus 1 (see FIG. 1) can be used by two or more extruders 21, 22, 23, 24 at the same time or by any one of the extruders 21, 22, 23, 24, and the rubber strip G. Is extruded and supplied to each winding position of the molded body H, wound and laminated to form a rubber member at each position. Further, the tire molding apparatus 1 includes various sensors (not shown) such as rotation and position detection means provided in each part of the apparatus in addition to the extruders 21, 22, 23, 24 and the winding means 30. Each unit and sensor are connected to the control device 40, respectively.

  The control device 40 includes, for example, a microprocessor (MPU) 41 that performs various data processing, analysis, calculation, and the like, a ROM (Read Only Memory) 42 that stores various programs, and a RAM that temporarily stores data that the MPU 41 directly accesses. (Random Access Memory) 43 and the like. Further, the control device 40 includes storage means such as a hard disk drive for storing various data necessary for control and molding of the unvulcanized tire, and connection means (not shown) connected to each part of the device. Control signals and various data are transmitted / received to / from each unit, and each operation related to unvulcanized tire molding is executed. In this way, the control device 40 operates each stage connected to each other based on a predetermined program at preset timings and conditions, and operates (steps) for molding (manufacturing) an unvulcanized tire ( Step). In addition, the control device 40 controls the operation of the plurality of extruders 21, 22, 23, 24 and the rotation of the support 10 so that the rubber strip G is extruded or wound simultaneously or sequentially. Therefore, the control device 40, together with the extruders 21, 22, 23, 24, the support 10 and the like, winds the rubber strip G described below, and forms each procedure and operation for forming a tire by molding an unvulcanized tire. Each means for performing is comprised.

  Here, in the present embodiment, the upper limit speed of extrusion of each rubber strip G by the plurality of extruders 21, 22, 23, 24 is stored in advance in the storage means of the control device 40, and these are compared by the control device 40. Thus, winding or lamination is performed while sequentially changing the extrusion speed of the rubber strip G and the rotation speed of the molded body H. The upper limit speed of the rubber strip G is such that the rubber temperature of the extruders 21, 22, 23, and 24 increases as the extrusion speed increases, whereas the rubber strip G can be extruded without cross-linking. The standard extruding speed (lamination speed) is set in advance, and the rubber is extruded at an extruding speed equal to or lower than that speed. For the upper limit of extrusion speed, the extrusion speed at which the rubber temperature becomes, for example, the crosslinking temperature or the extrusion speed at which the rubber temperature becomes constant at a predetermined temperature lower than the crosslinking temperature is investigated in advance for each of the extruders 21, 22, 23, and 24. Then, it is set and stored based on the result. At this time, the upper limit of extrusion speed is an appropriate extrusion speed (extrudable speed) at which crosslinking does not occur, such as the fastest extrusion speed obtained through investigation, or an extrusion speed with a certain margin for the extrusion speed. Is set.

  Next, a procedure and operation for manufacturing a tire by forming a rubber member of each part of the tire by simultaneously winding a plurality of rubber strips G around the molding body H by the tire molding apparatus 1 and molding an unvulcanized tire will be described. . Here, after the base rubber (base tread) of the inner layer portion of the tread rubber and the rubber chafer of both tire bead portions are formed simultaneously, the cap rubber (cap tread) of the outer layer portion of the tread rubber and the side wall rubber on the side surfaces of both tires. An example of forming these simultaneously will be described.

FIG. 3 is a flowchart showing a procedure for winding the rubber strip G by the tire molding device 1 and is executed under the control of the control device 40.
In the tire molding apparatus 1, as shown in the drawing, first, each extruder (here, extruders 22, 23, and 24) that supplies the rubber strip G to the molded body H from the above-described storage means of the control device 40. The upper limit speed of extrusion is acquired (S101). Next, when the rubber strip G is extruded at the extrusion upper limit speed from the acquired extrusion upper limit speed and the radius of the molding H at the position where each extruder 22, 23, 24 winds the rubber strip G, A corresponding rotation speed of the molding H that allows appropriate winding of each rubber strip G is calculated (S102). Also, the obtained plurality of extrusion upper limit speeds are compared (S103), and based on the comparison result, the relatively slowest extrusion upper limit speed (hereinafter referred to as the slowest extrusion upper limit speed) is compared among the compared extrusion upper limit speeds. A determination is made (S104).

  Subsequently, the rotational speed of the molded body H corresponding to the determined maximum extrusion upper limit speed is selected from the plurality of rotational speeds calculated as described above, and the support 10 (see FIG. 1) is rotated. The workpiece H is rotated in a predetermined direction at a rotation speed corresponding to the slowest extrusion upper limit speed (S105). Further, the extruders 22, 23, and 24 are operated in synchronization, and each rubber strip G is extruded at a predetermined extrusion speed that is equal to or less than the upper limit of extrusion speed. The extrusion speed at this time is calculated according to the moving speed (circumferential speed) of the molded body H at the winding position of each rubber strip G.

  Specifically, here, rubber strips G extruded from a pair of extruders 22 and 23 are respectively wound around a pair of tire beads to form rubber chafers, and rubber strips G extruded from other extruders 24 are A base rubber is formed by winding the tire shoulder portion around the tread portion (outer peripheral portion). At that time, the extrusion upper limit speed of the pair of extruders 22 and 23 is the slowest extrusion upper limit speed, and the upper limit speed of extrusion (or from the pair of extruders 22 and 23 while rotating the molding H in accordance with this. The rubber strip G is extruded at an extrusion speed close to that. On the other hand, the other extruder 24 pushes the rubber strip G toward the outer peripheral portion side of the molded body H, which has a faster moving speed in the tire circumferential direction. The rubber strip G is extruded at a higher extrusion speed.

  The tire molding apparatus 1 pushes the rubber strip G from each of the extruders 22, 23, 24 according to the extruders 22, 23 having the slowest extrusion upper limit speed in this way, and simultaneously supplies them to the rotating molded body H. (S106), each is wound around the molding H. That is, the tire molding apparatus 1 rotates the support 10 and the molded body H in synchronism with the extrusion of the rubber strip G by the extruders 22 and 23 having the slowest extrusion upper limit speed, and further in synchronization with this rotation. The rubber strip G is extruded from another extruder 24 at a predetermined extrusion speed. These extruded rubber strips G are wound around the respective winding positions of the molded body H by the winding means 30 (see FIG. 2), and the extruders 22, 23, 24, etc. are moved along the outer surfaces to sequentially laminate them. A plurality of rubber members are formed simultaneously.

  In this state, the tire molding apparatus 1 continues to rotate the molding H and supply the rubber strip G until the winding of the rubber strip G supplied from any of the extruders 22, 23, 24 is completed ( S107, NO). Thereby, when one or more windings are completed (S107, YES), the extrusion of the rubber strip G by the extruder (here, the extruders 22 and 23) is stopped, and the rubber strip G is cut as described above. Then, the supply ends (S108). Further, the winding by the other extruder 24 is also completed at the same time, and when the supply of the rubber strip G is not continued (S109, NO), the extruder 24 also stops the extrusion and all the winding (formation of the rubber member) is completed. It is determined whether or not (S112). On the other hand, when the supply of the rubber strip G is continued by the extruder 24 (S109, YES), the rotational speed of the molding H is changed according to the speed based on the faster extrusion upper limit speed of the extruder 24. The speed is increased (S110), and the extrusion speed by the extruder 24 is also changed to increase the speed (S111).

  As described above, the tire molding apparatus 1 is configured to perform the extrusion of the remaining extruders that supply the rubber strip G following the end of the supply of the rubber strip G by the extruders 22 and 23 having the slowest upper extrusion speed determined first. Compare the maximum speed. Based on the comparison result, the slowest upper limit speed of the extrusion is determined again, and the controller 40 controls the rotational speed of the molding H and each extruder according to the new slowest upper limit speed of extrusion. Here, the extrusion speed of the rubber strip G by the extruder 24 is changed to a speed higher than before the change. Accordingly, the control device 40 constitutes a speed changing means for changing each speed, and the slowest extruder 24 is next as soon as the lamination of the rubber strips G by the slowest extruders 22 and 23 is completed based on each upper limit speed of extrusion. The extrusion speed is increased to a predetermined speed equal to or lower than the upper limit speed of extrusion, and at the same time, the rotational speed of the molding H is increased in synchronization. In this way, the tire molding apparatus 1 changes the rotational speed of the molded body H and the extrusion speed of the rubber strip G in accordance with the slowest upper limit speed of extrusion, among those that continue extrusion, and more Move to higher speed in order. Here, the extrusion speed of the extruder 24 is increased to extrude the rubber strip G, and the lamination is continued by winding around the molded body H at a higher speed, thereby completing the formation of the rubber member.

FIG. 4 is a main part cross-sectional view schematically showing a winding state of each rubber strip G, and shows a part of a cross section in the width direction of the molded body H. FIG. 5 is a graph showing changes in the rotational speed of the molded body H, where the horizontal axis represents time and the vertical axis represents the rotational speed.
As shown in FIG. 4, the tire molding apparatus 1 extrudes the rubber strip GA from the pair of extruders 22 and 23 at an extrusion speed D1 corresponding to the upper limit speed of the extrusion, and rotates at a predetermined speed synchronously (in the drawing). Supply to the molding H to be arrow K). The rubber strip GA is wound around the outer surfaces of a pair of tire bead portions V (only one is shown in the figure) of the molded body H in order from the inner side in the tire radial direction to the outer side (from the lower side to the upper side in the figure). A rubber chafer having a predetermined shape is formed.

  At the same time, the tire molding apparatus 1 extrudes the rubber strip GB from the other extruder 24 at a predetermined extrusion speed D2 and winds the rubber strip GB around the tire shoulder SH of the molding H in order from the inner side to the outer side in the tire radial direction. Stack up to the part T. Further, when the formation of the rubber chafer by the rubber strip GA is completed, the extrusion speed of the rubber strip GB by the extruder 24 is changed to a higher extrusion speed D3 and, as shown in FIG. Synchronize the speed and change to a faster speed. In this way, the extrusion speed of the rubber strip GB and the rotation speed of the molded body H are changed during winding (Z in FIGS. 4 and 5), and the rubber strip GB is changed in the tire width direction (right direction in FIG. 4). A base rubber having a predetermined shape is formed by wrapping around the tread portion T toward the other side and laminating the tire shoulder portion SH on the other side.

  At this time, in the tire molding apparatus 1, the rubber strips GA and GB simultaneously supplied from the respective extruders 22, 23, and 24 by the winding means 30 are aligned in the same direction along the outer surface of the rotating molded body H (see FIG. Each rubber member is formed by winding in order toward each arrow 4). Further, when changing each speed, it is controlled by the control device 40 as speed changing means, and the rotational speed of the molding H and the extrusion of the rubber strip G by each extruder (here, the rubber strip GB by the extruder 24). The speed is continuously changed at a constant rate of increase (see FIG. 5) from the speed before the change to the speed after the change. During this continuous change in speed, the extruders 22 and 23 that have finished supplying the rubber strip GA cause the cutting operation of each rubber strip GA to be executed in conjunction with each other.

  Next, the tire molding device 1 (see FIG. 3) determines whether or not the winding of all the rubber strips G is completed when the winding of the rubber strips G by the extruder 24 is completed. The above steps are repeated until the end (S112, YES) (S112, NO). Here, the rubber strip G is subsequently extruded from the extruder 21 or the like, and similarly, the cap rubber and the side wall rubber are simultaneously formed at the respective positions, and the winding of all the rubber strips G is completed. With this termination, the tire molding apparatus 1 stops the rotation of the molded body H and moves each of the extruders 21, 22, 23, 24 to a position that does not hinder the movement of the molded body H. (S113), the molding H is moved to the outside, and the winding process is completed. As described above, the tire molding apparatus 1 extrudes the rubber strips G from the plurality of extruders 21, 22, 23, and 24, supplies the rubber strips G to the moldings H, and simultaneously winds the rubber strips G around the rotating moldings H. Etc. to form an unvulcanized tire. Thereafter, the molded unvulcanized tire is vulcanized and molded to produce a product tire.

  As described above, in the present embodiment, since a plurality of rubber strips G are simultaneously wound around the molded body H to form an unvulcanized tire, the plurality of rubber members are moved without moving the molded body H each time. Can be formed simultaneously. Accordingly, the time required for the winding process can be shortened, energy consumed can be reduced, and the efficiency of unvulcanized tire molding can be improved. In addition, since the waiting time until the next rubber lamination can be shortened, the temperature rise of the rubber in each of the extruders 21, 22, 23, 24 can be suppressed, and the emptying operation performed during standby to prevent the above-mentioned rubber scorching. The amount of rubber to be discarded can be reduced by reducing the amount of rubber, reducing the amount of rubber scraped and the generation of rubber scraps associated therewith.

  At that time, in the tire molding apparatus 1, the molding body H is rotated at a rotational speed corresponding to the slowest upper limit speed of extrusion in each of the extruders 21, 22, 23, and 24 for supplying the rubber strip G. The rubber strip G is extruded from each of the extruders 21, 22, 23, and 24 at the extrusion speed in accordance with the above and wound around the molding H at the same time. Therefore, each extrusion speed does not become too fast, it is possible to suppress the heat generated in the rubber and prevent the rubber from being heated to the crosslinking temperature to cause crosslinking, especially when forming different rubber members or different types When extruding the rubber, each extrusion speed can be adjusted appropriately. In addition, with the end of the supply of the rubber strip G by the extruder (here, the extruders 22 and 23) with the slowest upper limit of extrusion speed, in each extruder (here, the extruder 24) that supplies the rubber strip G subsequently. The rotational speed of the molding H and the extrusion speed of the rubber strip G are changed according to the slowest upper extrusion speed. Accordingly, the winding speed of the rubber strip G can be sequentially increased while reliably preventing the occurrence of cross-linking, and the time required for winding can be appropriately shortened to ensure efficient molding of the unvulcanized tire. .

  Therefore, according to this embodiment, the rubber strip G extruded from the plurality of extruders 21, 22, 23, and 24 is simultaneously wound around the molded body H while preventing the rubber from being crosslinked and maintaining the quality. Thus, an unvulcanized tire can be formed. As a result, the molding time and energy cost of the unvulcanized tire can be reduced, and the rubber reworking operation and the generation of rubber waste by the extruders 21, 22, 23, and 24 can be reduced.

  Further, here, the rotational speed of the molding H and the extrusion speed of the rubber strip G by the extruders 21, 22, 23, 24 are continuously changed from the speed before the change to the speed after the change, respectively. The rubber strip G is continuously wound without stopping. Therefore, the heating operation for warm-up accompanying the stop of the extruders 21, 22, 23, and 24 becomes unnecessary, and the time required for them can be shortened. At the same time, the extruders 21, 22, 23, and 24 that terminate the supply of the rubber strip G perform the cutting operation of the rubber strip G (see FIG. 2) while changing the respective speeds. In 21, 22, 23, and 24, the extrusion speed is gradually adjusted and changed. Thus, since the operation | movement for every extruder 21,22,23,24 can be performed continuously simultaneously, each operation | movement can be performed smoothly and efficiently, and the efficiency of the winding operation | work of the rubber strip G can be improved. .

  Here, as described above, it is desirable that the plurality of rubber strips G to be simultaneously wound around the molding target H are sequentially wound in the same direction (see FIG. 4) along the outer surface of the rotating molding target H. In this way, for example, when forming adjacent rubber members at the same time, winding can be started and ended smoothly and appropriately without interfering with each other at the winding start and end, and the ends are set as set. It is possible to effectively prevent the occurrence of a defect at the overlapping portion by overlapping and winding the film without a defect. However, some or all of the plurality of rubber strips G may be partially or entirely attached to the outer surface of the molded body H depending on their winding positions or the position and shape of each rubber member to be formed in the molded body H. You may make it wind toward different directions along.

  In the present embodiment, four extruders 21, 22, 23, and 24 are installed surrounding the molding H, but two, three, or five or more extruders are installed, and rubber is thereby used. The strip G may be simultaneously extruded and wound around the molded body H. At that time, in addition to simultaneous winding of a plurality of rubber strips G, only one rubber strip G is wound before and after that, or three or more rubber members are formed at the same time, and each time the formation is finished, What is necessary is just to shape | mold a rubber member by arbitrary formation patterns, such as changing the rotational speed of the molded object H, and each extrusion speed one by one, and shape | mold an unvulcanized tire.

  Moreover, this tire shaping | molding apparatus 1 shall be used for shaping | molding of various tires before vulcanization, such as an unvulcanized retreaded tire which winds rubber strip G and forms tread rubber etc. besides a green tire (green tire). Can do. Therefore, the unvulcanized tire of the present invention includes various tires that are formed by winding the extruded rubber around the molded body H in addition to the raw tire.

  DESCRIPTION OF SYMBOLS 1 ... Tire shaping | molding apparatus, 10 ... Support body, 21, 22, 23, 24 ... Extruder, 30 ... Winding means, 31 ... Lower roller, 32 ... Upper roller, 40 ... control device, 41 ... MPU, 42 ... ROM, 43 ... RAM, H ... molding object, G ... rubber strip.

Claims (6)

A plurality of extruders that can extrude rubber and simultaneously supply the object to be molded, and a wrapping means that wraps the rubber supplied from the plurality of extruders around the respective objects to be rotated, are supplied to the object to be molded. A tire molding apparatus for simultaneously molding each rubber to form an unvulcanized tire,
Means for storing an upper limit speed of extrusion of each rubber by a plurality of extruders;
Means for obtaining and comparing the upper limit of extrusion speed of each extruder for supplying rubber to the molded body;
Means for determining the slowest extrusion upper limit speed from the compared extrusion upper limit speeds;
Means for rotating the workpiece at a rotation speed according to the determined extrusion upper limit speed;
Means for supplying rubber from each extruder to a rotating molded body;
With the end of the rubber supply by the extruder with the determined upper limit extrusion speed, the rotation speed of the molded body and the extrusion of the rubber by each extruder according to the slowest upper extrusion speed in each extruder that subsequently supplies the rubber Speed changing means for changing the speed;
A tire forming apparatus comprising: In the tire forming apparatus according to claim 1,
A tire molding apparatus, wherein the winding means winds the rubber supplied simultaneously from each extruder sequentially in the same direction along the outer surface of the rotating molded body. In the tire forming apparatus according to claim 1 or 2,
A tire molding apparatus characterized in that the speed changing means has means for continuously changing the rotational speed of the molded body and the extrusion speed of rubber by each extruder from the speed before the change to the speed after the change. It is a tire manufacturing method in which rubber is extruded from a plurality of extruders and supplied to a molded body, and each rubber is simultaneously wound around a rotating molded body to form an unvulcanized tire,
A step of acquiring and comparing the upper limit speed of rubber extrusion of each extruder for supplying rubber to the molded body;
Determining the slowest extrusion upper limit speed from the compared extrusion upper limit speed,
A step of rotating the workpiece at a rotation speed according to the determined upper limit extrusion speed;
A process of supplying rubber from each extruder and winding it around a rotating molded body;
With the end of the rubber supply by the extruder with the determined upper limit extrusion speed, the rotation speed of the molded body and the extrusion of the rubber by each extruder according to the slowest upper extrusion speed in each extruder that subsequently supplies the rubber A speed changing step for changing the speed;
A tire manufacturing method comprising: In the tire manufacturing method according to claim 4,
In the tire manufacturing method, the step of winding winds rubbers supplied simultaneously from the respective extruders sequentially in the same direction along the outer surface of the rotating molded body. In the tire manufacturing method according to claim 4 or 5,
A tire manufacturing method, wherein the speed changing step includes a step of continuously changing the rotational speed of the molded body and the extrusion speed of rubber by each extruder from the speed before the change to the speed after the change.

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