WO2017209057A1 - Method for manufacturing tire and apparatus for manufacturing tire - Google Patents

Abstract

Provided are a method for manufacturing a tire and an apparatus for manufacturing a tire capable of making a tire manufacturing step more efficient. The method for manufacturing a tire according to the present invention comprises: a step of injecting unvulcanized tread rubber, being extruded using an extrusion molding unit, into an air gap part formed by an external surface of a green case arranged between a vulcanization mold and a bladder positioned inside the vulcanization mold and by a molding surface of the vulcanization mold; and a step of vulcanizing the unvulcanized tread rubber after injecting the unvulcanized tread rubber into the air gap part. The apparatus for manufacturing a tire according to the present invention is provided with a vulcanization mold having a molding surface, a diametrically expansible and contractible bladder, and an extrusion molding unit that extrudes unvulcanized tread rubber. The vulcanization mold comprises: a joining part connectable to the extrusion molding unit; and an inflow path that causes the unvulcanized tread rubber to flow from the outside to the inside of the vulcanization mold.

Description

Tire manufacturing method and tire manufacturing apparatus

The present invention relates to a tire manufacturing method and a tire manufacturing apparatus.

Normally, a tire is formed by winding and laminating a sheet of unvulcanized tread rubber on the outer peripheral surface of an unvulcanized green case formed by laminating members such as carcass and belt. An unvulcanized tread is then formed, and then the obtained unvulcanized tire (also referred to as a green tire) is vulcanized in a vulcanization mold.

Here, in tires for passenger cars and the like, the formation of a dread pattern such as a groove is caused by causing the tread rubber to flow by heat at the time of vulcanization in the vulcanization process, so that the tread pattern inside the vulcanization mold, etc. This is done by transferring the molding surface defining the outer shape of the tire to the tread.
On the other hand, in large tires such as construction and mining vehicle tires (OR tires), when the tread groove is formed by pressing the molding surface of the vulcanization mold against the tread rubber, the construction and mining vehicle Since the tire for use is large and the groove volume of the tread is large, the convex part for forming the groove in the molding surface of the vulcanization mold does not enter or break in the desired posture with respect to the tread rubber. Can occur.
Therefore, in some conventional construction and mining vehicle tires, a tread is formed on an unvulcanized green case, and then a groove corresponding to the tread pattern is formed on the tread (unvulcanized). Before being put in, it is formed by grinding in advance (for example, see Patent Document 1).

JP 2010-240888 A

By the way, since construction and mining vehicle tires (OR) are large tires, in the manufacture of tires, a large amount of sheet-shaped unvulcanized tread rubber laminate on the outer peripheral surface of the green case, Grinding to form grooves in the tread requires a long work, which has been a cause of increased costs in the manufacture of tires.

Therefore, an object of the present invention is to provide a tire manufacturing method and a tire manufacturing apparatus capable of improving the efficiency of the tire manufacturing process.

The tire manufacturing method according to the present invention is formed by an outer surface of a green case disposed between a vulcanization mold and a bladder located inside the vulcanization mold, and a molding surface of the vulcanization mold. A step of injecting unvulcanized tread rubber extruded using an extrusion molding portion into the void portion,
And a step of vulcanizing the unvulcanized tread rubber after injecting the unvulcanized tread rubber into the gap.

In addition, the tire manufacturing apparatus of the present invention includes a vulcanization mold having a molding surface that defines the outer shape of the tire, a bladder that can expand and contract so as to press the tire radially outward, An extrusion molding unit for extruding sulfur tread rubber, and a tire manufacturing apparatus comprising:
The vulcanization mold includes a joint that can be connected to the extrusion molding section, and an inflow passage through which unvulcanized tread rubber flows from the outside to the inside of the vulcanization mold.

According to the present invention, it is possible to provide a tire manufacturing method and a tire manufacturing apparatus capable of improving the efficiency of the tire manufacturing process.

1 is a side view with a part cut away, schematically showing a tire manufacturing apparatus according to an embodiment of the present invention. It is sectional drawing which expands and shows a part of tire manufacturing apparatus shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a side view with a part cut away schematically showing a tire manufacturing apparatus according to an embodiment of the present invention. Further, FIG. 2 is an enlarged sectional view showing a part of the tire manufacturing apparatus shown in FIG. The tire manufacturing apparatus can also be suitably used to implement the tire manufacturing method according to an embodiment of the present invention.
Here, the tire manufacturing apparatus 1 shown in FIG. 1 includes a vulcanizing device section 3 and an extrusion molding section 4 each having a vulcanization mold 31 and a bladder 32, and includes a vulcanization mold 31, a bladder 32 and an extrusion molding section. 4 is combined, and the green case 2 is disposed inside the vulcanization mold 31.

[Tire and green case]
First, a tire manufactured by the tire manufacturing method and manufacturing apparatus of the present invention, and a green case used for the tire manufacturing method and manufacturing apparatus will be described.
The tire manufactured by the tire manufacturing method and manufacturing apparatus of the present invention can be a large tire such as a tire for construction and mining vehicles.
The tire 2 is an annular tire body having a structure that serves as a base of the tire 2 and is a tread as a land portion provided with various grooves extending in the tire circumferential direction and the tire width direction, and a portion excluding the tread. It consists of parts. And this tire 2 prepares separately the green case corresponding to a tire main-body part, and the unvulcanized tread rubber which forms a tread, These are vulcanized | cured using the manufacturing apparatus 1 shown in FIG. Thus, they are formed by being bonded to each other.

The green case 2 includes, for example, a carcass having a radial structure extending in a toroidal shape between a pair of bead portions, and a belt disposed on the outer side in the tire radial direction of the carcass in the tread portion. Further, although the tread rubber is basically not provided on the outer peripheral surface of the green case 2, a thin tread rubber can be provided as necessary. Further, the green case 2 is not vulcanized but is in an unvulcanized state, a semi-vulcanized state in which vulcanization is separately performed halfway before being loaded into the vulcanizer unit 3, or vulcanization. Although it is possible to use a completely vulcanized state, it is preferable to use the green case 2 before vulcanization from the viewpoint of improving the efficiency of the production process.

The unvulcanized tread rubber is a rubber that constitutes the tread of the tire 2 by being vulcanized, and various rubbers are selected according to the intended performance of the tire, and various additives are contained. ing. Specifically, the unvulcanized tread rubber is not limited as long as it has a flow characteristic that can be extruded and can be vulcanized. For example, natural rubber, diene series such as IR, SBR, and BR Rubber or rubber such as butyl rubber, halogenated butyl rubber, non-diene rubber such as EPDM, carbon black, oil, anti-aging agent, processing aid, softener, plasticizer, vulcanizing agent, vulcanization accelerator, Various additives such as a vulcanization retarder can be appropriately contained and configured.

[Tire manufacturing equipment]
Next, a tire manufacturing apparatus will be described with reference to FIGS.
As shown in FIGS. 1 and 2, in this embodiment, the tire manufacturing apparatus 1 includes a vulcanizing unit 3 having a vulcanizing mold 31 and a bladder 32, and an extrusion molding unit 4.
As shown in FIG. 2, the vulcanization mold 31 of the vulcanization unit 3 has a molding surface 31 s that defines the outer surface shape of the tire 2 such as a tread pattern on the inner surface of the vulcanization mold 31. As described later, the molding surface 31s of the metal mold 31 is transferred to unvulcanized tread rubber injected into the metal mold 31 so that various grooves are formed on the outer surface of the tire 2 after vulcanization. A tread pattern including the like can be formed.
Further, the vulcanization mold 31 has a joint portion 33 that can be connected to the extrusion molding portion 4 to be described later, and an inflow passage 34 through which unvulcanized tread rubber flows from the outside to the inside of the vulcanization die 31. is doing.
In the present embodiment, in the state where the tire 2 is disposed in the vulcanization mold 31, the direction that becomes the width direction of the tire 2 is the mold width direction, and the direction that becomes the radial direction of the tire 2 is the mold radial direction. And the direction used as the circumferential direction of the tire 2 is called a metal mold | die circumferential direction.

In this embodiment, the vulcanization mold 31 can be divided into a plurality of parts in the mold width direction or the mold circumferential direction. In the example shown in FIG. 2, the vulcanization mold 31 is divided into two in the mold width direction. In addition, it has a structure composed of a lower mold 31a and an upper mold 31b. Inside the lower mold 31a and the upper mold 31b, a lower mold tire molded part 31c and an upper mold tire molded part 31d are formed by dividing the tire molded part into two parts, and molded on the inner surface of each molded part. A surface 31s is provided. Moreover, the lower mold tire molding part 31c and the upper mold tire molding part 31d can also be constituted by a plurality of division molds divided in the mold circumferential direction, thereby facilitating the assembly of the vulcanization mold 31. Further, the vulcanization mold 31 can be easily removed from the tire 2 after the green tire 2 is vulcanized.

The vulcanization mold 31 has a joint portion 33 that can be connected to an extrusion molding portion 4 to be described later. In the illustrated example, the vulcanization die 31 is in the upper die 31b. The joining portion 33 has a corresponding shape so that one end on the inflow passage 34 side, which will be described later, and the other end on the extrusion portion 4 side can be connected to the inflow passage 34 and the discharge port of the extrusion portion 4, respectively. . Further, the joint portion 33 is hollow so that the unvulcanized tread rubber extruded by the extrusion molding portion 4 can pass through the inside, and can be kept warm during transportation of the unvulcanized tread rubber. Temperature control means.

The vulcanization mold 31 has an inflow passage 34 through which unvulcanized tread rubber flows from the outside to the inside of the vulcanization mold 31. Specifically, one end of the inflow passage 34 (inside of the vulcanization mold 31) opens into a gap (cavity) formed inside the vulcanization mold 31 and the other end of the inflow passage 34 (vulcanization). The outer side of the mold 31 is formed so as to be connectable to the joint 33.
In the example shown in the figure, the inflow passage 34 is a single unbranched passage, but the mold circumferential direction in the vulcanization mold 31 opens a plurality of inflow passages 34 into the vulcanization mold 31. It can also be branched to. Further, a plurality of inflow passages 34 that are not branched can be provided in the vulcanization mold 31 by branching the joint portion 33. Further, in the illustrated example, one end (opening portion) of the inflow passage 34 is positioned on the molding surface 31s corresponding to the outer portion (buttress portion) in the tire width direction of the tread (unvulcanized from the side surface of the tire 2). The tread rubber is injected), but it can also be positioned on the molding surface 31s corresponding to the tire radial outer portion of the tread (unvulcanized tread rubber is injected from the tire radial outer side of the tire 2). Furthermore, although one end (opening) of the inflow passage 34 can be positioned on the molding surface 31s corresponding to the land portion or groove of the tread, the one end is positioned on the molding surface 31s corresponding to the land portion. Inflow path traces (gate marks) that can be formed in the tread of the tire 2 can be easily processed, which is preferable.

The vulcanization mold 31 has an exhaust port for discharging air staying in the vulcanization mold 31 from the inside of the vulcanization mold 31 to the outside, and a temperature adjustment path for flowing a heating medium and a cooling medium. Can be provided.

Here, the tire manufacturing apparatus 1 includes a bladder 32 that can expand and contract so as to press the tire 2 radially outward. Specifically, in the illustrated example, the vulcanization mold 31 is provided at the center of the lower mold 31 a so as to expand and contract in the mold radial direction of the vulcanization mold 31. More specifically, the bladder 32 is formed in a bag shape having airtightness, with one end held by the lower clamp ring 32a and the other end held by the upper clamp ring 32b. The lower clamp ring 32a and the upper clamp ring 32b are attached to the center post 32c so that the thermal fluid supplied to the inside of the bladder 32 does not leak to the outside. Note that an inert gas, nitrogen gas, saturated water vapor, or the like is employed as the thermal fluid.
Thermal fluid is supplied into the bladder 32 through a thermal fluid supply path (not shown) provided in the center post 32c. The bladder 32 expands with the supply of the thermal fluid, and can press the green case 2 from the inside toward the outside.
The bladder 32 can be made of, for example, a butyl rubber composition having a low gas permeability.

Further, in the tire manufacturing apparatus 1, as shown in FIG. 1, the upper mold 31 b of the vulcanization mold 31 is fitted to the lower mold 31 a, and the upper mold 31 b is brought into close contact with each other. A press machine 35 is provided for removal.

As shown in FIG. 1, the extrusion molding portion 4 can be arranged adjacent to the vulcanization mold 31.
As shown in FIG. 2, the extrusion molding unit 4 includes an extrusion molding machine 41 for kneading and extruding a rubber material, a metering pump connected to the leading end side in the extrusion direction of the extrusion molding machine 41, here a gear pump 42, and a tip. And a base 43 connected to the side. The extrusion machine 41 includes a cylindrical barrel 41a, a hopper 41b connected to a supply port of the barrel, a screw 41c that kneads and feeds a rubber material, and a drive motor 41d that rotationally drives the screw 41c. Have. A metering pump can be omitted.
The gear pump 42 has a pair of gears 42 a and has a function of feeding the rubber material toward the outlet 43 toward the base 43. The gears 42a are each driven to rotate by a gear pump drive motor 41d, and by setting their rotational speed to a predetermined rotational speed, the rubber material (unvulcanized tread rubber) can be quantitatively extruded. Instead of a metering pump such as a gear pump, a flow meter for measuring the amount of fluid can be used with or without a pump.
The base 43 has a shape that allows the tip of the base 43 to be connected to the end of the joint 33 of the vulcanization mold 31 described above, and the unvulcanized tread rubber supplied from the gear pump 42 to the base 43 is connected to the joint 43. 33, extruded into the vulcanization mold 31 through the inflow passage 34. In addition, it is also possible to directly connect to the joint without providing either one or both of the base and the gear pump.

In this embodiment, one extrusion molding unit 4 is provided for the vulcanization mold 31, but a plurality of extrusion molding units 4 may be provided as necessary.

The operation and effect of the tire manufacturing apparatus of this embodiment will be described.
Conventionally, since tires for construction and mining vehicles are large tires, in the manufacture of tires, a large amount of sheet-shaped unvulcanized tread rubber laminate on the outer peripheral surface of the green case, and in addition to the tread in advance Grinding to form the grooves requires a long work, which has been a cause of increased costs in the manufacture of tires.
On the other hand, according to the tire manufacturing apparatus 1, the outer surface of the green case 2 in the process of loading the green tire 2 into the vulcanization mold 31 in the manufacturing process of the large tire 2. Since the step of laminating the unvulcanized tread rubber and the step of grinding the groove on the tread surface can be omitted, the manufacturing process of the tire 2 can be made efficient.
Specifically, the tire manufacturing apparatus 1 includes a vulcanization mold 31 and an extrusion molding unit 4, and the vulcanization mold 31 includes a joint 33 that can be connected to the extrusion molding unit 4, and an unvulcanized product. And an inflow passage 34 for allowing the tread rubber to flow from the outside to the inside of the vulcanization mold 31, so that the outer surface of the green case 2 disposed inside the vulcanization mold 31 and the vulcanization mold 31 If a tread is formed by injecting unvulcanized tread rubber, which is extruded using the extrusion molding portion 4, into the gap portion 31 e formed by the molding surface 31 s through the inflow passage 34, the vulcanized gold in the production of the conventional tire Since the above-mentioned process performed before loading the green tire into the mold 31 can be omitted, the tire manufacturing process can be made more efficient.

In the tire manufacturing apparatus 1, when forming an unvulcanized tread rubber on the outer surface of the green case 2 inside the vulcanization mold 31, the green case 2 disposed inside the vulcanization mold 31. Can be pressed and supported by the bladder 32, for example, while assembling a large amount of rigid bodies inside the large green case 2 as compared with the case where the green case 2 is supported using a rigid body such as metal. There is no need to arrange the tires, and therefore the tire manufacturing process can be made more efficient. Further, since the bladder 32 can be expanded and contracted, the pressure on the green case 2 can be adjusted depending on the degree of injection of the unvulcanized tread rubber into the vulcanizing mold 31 and the uniformity of the tire 2 is reduced. The tire 2 can be manufactured without any problems.
Further, in the tire manufacturing apparatus 1, since the unvulcanized tread rubber is injected by extrusion of the extrusion molding portion 4, the temperature of the unvulcanized tread rubber is maintained directly from the extrusion molding portion 4. It can be poured into the vulcanization mold 31 in a fluid state without any problems. For example, when unvulcanized tread rubber is injected using an injection molding machine, the rubber composition is kneaded and extruded by an extrusion molding machine to pre-manufacture unvulcanized tread rubber as a separate intermediate member. Although it is necessary, or a large amount of unvulcanized tread rubber cannot be injected into the vulcanization mold at once, the use of the extrusion molding part 4 can improve the efficiency of the production process.
As described above, according to the tire manufacturing apparatus 1, the tire manufacturing process can be made more efficient.

Further, as described above, when the extruded portion 4 has the gear pump 42 as in the tire manufacturing apparatus 1, the gear pump 42 can quantitatively extrude unvulcanized tread rubber. For example, the end point of the injection of the unvulcanized tread rubber into the interior of the vulcanization mold 31 can be the time point when a predetermined amount of the unvulcanized tread rubber is extruded, and the accuracy of manufacturing the tire 2 is sufficiently high Can be improved.

[Tire manufacturing method]
Next, a tire manufacturing method according to an embodiment of the present invention will be described using the tire manufacturing apparatus 1 shown in FIGS.
The tire manufacturing method of the present embodiment includes an inflow passage 34 for allowing unvulcanized tread rubber to flow into the inside from the outside, and a vulcanizing mold 31 having a molding surface 31 s that defines the outer shape of the tire 2, In this method, the tire 2 is manufactured by performing vulcanization molding using a bladder 32 that can expand and contract so as to press the tire 2 radially outward.

In this tire manufacturing method, first, as shown in FIG. 1, the green case 2 is disposed on the lower mold 31a with the upper mold 31b removed. At this time, the bladder 32 is in a reduced diameter state. After the green case 2 is disposed, the upper mold 31b and the lower mold 31a are closed to make the inside of the vulcanization mold 31 a closed space.
Next, the joint portion 33 is connected to the inflow passage 34 of the upper mold 31 b, and the extruded portion 4 is connected to the joint portion 33. When the extrusion molding part 4 is connected to the joint part 33, it is preferable to prepare an unvulcanized tread rubber in a state where it can be extruded. Specifically, an amount of rubber material capable of forming a tread of at least one tire 2 and an additive added as necessary are prepared in a state where the extruded portion 4 can be filled and continuously extruded.
In addition, as the green case 2, it is also possible to use a semi-vulcanized state or a vulcanized state after complete vulcanization.

Subsequently, as shown in FIG. 2, the outer surface of the green case 2 disposed between the vulcanization mold 31 and the bladder 32 located inside the vulcanization mold 31, and the vulcanization mold 31. Unvulcanized tread rubber extruded using the extrusion molding portion 4 is injected through the inflow passage 34 into the gap portion 31e formed by the molding surface 31s.
Specifically, first, the bladder 32 is expanded (expanded) with respect to the green case 2 disposed inside the vulcanization mold 31 to press the green case 2 from the inside to the outside. Thereby, the green case 2 is shaped.

Next, after pressing the green case 2 from the inside to the outside with the bladder 32, the unvulcanized tread rubber is extruded using the extrusion molding portion 4 and injected into the void portion 31 e inside the vulcanizing mold 31. Thus, the unvulcanized tread rubber gradually fills the gap 31e while flowing, and a tread is formed while a predetermined tread pattern is formed by the molding surface 31s of the vulcanization mold 31. Therefore, while the unvulcanized tread rubber is injected into the gap portion 31e and vulcanized, the bladder 32 is expanded in diameter to press the green case 2 from the inner side in the tire radial direction to the outer side, for example. As a result, the shape of the green case 2 is retained, and when the unvulcanized tread rubber is injected into the vulcanizing mold 31, the sidewall of the tire 2, for example, other than the gap 31e inside the vulcanizing mold 31 The unvulcanized tread rubber can be prevented from flowing into the portion. Further, when unvulcanized tread rubber is injected into the inside of the vulcanizing mold 31, it is possible to prevent the green case 2 from being deformed and the arrangement positions of the constituent members of the tire 2 from being displaced and the uniformity being lowered. Can do.

By the way, the end point of the injection of the unvulcanized tread rubber into the gap portion 31e can be the time when the inside of the vulcanization mold 31 reaches a predetermined pressure (for example, confirm by the internal pressure of the bladder) It is preferable that a predetermined amount of unvulcanized tread rubber be extruded from the extruded portion 4. In this tire manufacturing method, the bladder 32 is used to support the green case 2 from the inside. However, the bladder 32 and the green case 2 may expand and deform over time due to heat during the injection of unvulcanized tread rubber. This is because the volume of the tread may fluctuate from a predetermined amount when extended.

And after filling the unvulcanized tread rubber into the gap portion 31e, the unvulcanized tread rubber and the green case 2 are vulcanized with the vulcanization mold 31 heated. When the unvulcanized tread rubber is vulcanized, the tread made of the vulcanized rubber is vulcanized and bonded to the outer peripheral surface of the green case 2 integrally with the outer peripheral surface of the green case 2. In addition, after the filling of the unvulcanized tread rubber into the gap portion 31e, the extrusion molding portion 4 can be separated from the vulcanization mold 31. For example, a backflow prevention valve or the like is provided in the inflow passage 34 of the vulcanization mold 31. By providing the shut-off valve, the unvulcanized tread rubber can be prevented from backflow after the extrusion molding portion 4 is separated from the vulcanization mold 31.

After the green tire 2 is vulcanized, the diameter of the expanded bladder 32 is reduced, the upper mold 31b of the vulcanizing mold 31 is separated from the lower mold 31a, and the vulcanized tire 2 is Take out. Thereafter, for example, spew (formed by the tread rubber flowing into the exhaust port of the vulcanization mold 31 together with the air inside the vulcanization mold 31 when the tire 2 is vulcanized) existing on the surface of the tire 2. The tire 2 is completed through steps such as removal.

Here, when the unvulcanized tread rubber is injected into the inside of the vulcanizing mold 31, the vulcanizing mold 31 including the joint portion 33, the vulcanizing device section 3 such as the bladder 32 (particularly, the unvulcanized tread rubber). And the portion where the green case 2 comes into contact) is preferably preheated to about 80 to 170 ° C., for example, and the unvulcanized tread rubber is preferably injected within the temperature range. This is because the fluidity of the unvulcanized tread rubber can be made appropriate.
Further, when vulcanizing the unvulcanized tread rubber and the green case 2, it is preferable to heat at least the vulcanization mold 31 and the bladder 32 to about 100 to 170 ° C. The green tire 2 can be sufficiently vulcanized.

In addition, the internal pressure of the bladder 32 is set to 0.02 to 0.10 MPa, for example, to maintain the shape of the green case 2 at the start of injection of the unvulcanized tread rubber into the gap portion 31e. The green case 2 is gradually increased so as not to be deformed by the pressure of the sulfur tread rubber. When filling the gap portion 31e and heating and vulcanizing by heat transfer from the vulcanization mold 31 and the bladder 32, the internal pressure of the bladder 32 is applied to the outer surface of the tread as described above. In order to sufficiently transfer and form the shape (tread pattern), for example, 1.5 to 3.0 MPa.

As described above, according to the tire manufacturing method of this embodiment, in the process of manufacturing a large tire, the process performed before loading the green tire 2 into the vulcanizing mold 31 is performed on the outer surface of the green case 2. Since the unvulcanized tread rubber laminating step and the step of grinding the groove on the tread surface can be omitted, the tire manufacturing step can be made more efficient.
Specifically, the extruded portion 4 is used to extrude a gap portion 31e formed by the outer surface of the green case 2 disposed inside the vulcanizing mold 31 and the molding surface 31s of the vulcanizing die 31. Since the unvulcanized tread rubber is injected through the inflow passage 34, the above-described unvulcanized tread rubber winding process and tread surface, which are performed before the green tire is loaded into the vulcanization mold in the conventional tire manufacture, Since the step of grinding the groove can be omitted, the tire manufacturing process can be made more efficient.
In this tire manufacturing method, a bladder 32 is used, and the green case 2 disposed inside the vulcanizing mold 31 can be pressed and supported by the bladder 32. Compared to the case where the green case 2 is supported using a rigid body, it is not necessary to assemble and arrange a large amount of rigid bodies inside the large-scale green case 2, and therefore the tire manufacturing process can be made more efficient. . Further, since the bladder 32 can be expanded and contracted, the pressure on the green case 2 can be adjusted depending on the degree of injection of the unvulcanized tread rubber into the vulcanizing mold 31 and the uniformity of the tire 2 is reduced. The tire 2 can be manufactured without any problems.
Moreover, in this tire 2 manufacturing method, since the unvulcanized tread rubber is injected by extrusion of the extrusion molding portion 4, the temperature of the unvulcanized tread rubber is maintained directly from the extrusion molding portion 4. It can be poured into the vulcanization mold 31 in a fluid state without any problems. For example, when unvulcanized tread rubber is injected using an injection molding machine, the rubber composition is kneaded and extruded by the extrusion molding machine 41, and unvulcanized tread rubber as a separate intermediate member is manufactured in advance. Or a large amount of unvulcanized tread rubber cannot be injected into the vulcanization mold 31 at once. However, the use of the extrusion molding unit 4 can improve the efficiency of the manufacturing process. it can.
As mentioned above, according to the manufacturing method of this tire 2, a tire manufacturing process can be made efficient.

As mentioned above, although embodiment of this invention was described with reference to drawings, the manufacturing method and tire manufacturing apparatus of this invention are not limited to the said example, A change can be added suitably. The tire manufacturing method and tire manufacturing apparatus of the present invention are preferably applied to large tires such as construction and mining vehicle tires, but can also be applied to tires other than the large tires.

According to the present invention, it is possible to provide a tire manufacturing method and a tire manufacturing apparatus capable of improving the efficiency of the tire manufacturing process.

1: tire manufacturing equipment, 2: tire, green case, green tire, 3: vulcanizing equipment section, 31: vulcanizing mold, 31a: lower mold, 31b: upper mold, 31c: lower tire molding section, 31d : Upper tire molding part, 31e: gap part, 31s: molding surface, 32: bladder, 32a: lower clamp ring, 32b: upper clamp ring, 32c: center post, 33: joint part, 34: inflow passage, 35: Press machine, 4: Extrusion part, 41: Extruder machine, 41a: Barrel, 41b: Hopper, 41c: Screw, 41d: Drive motor, 42: Gear pump, 42a: Gear, 43: Base

Claims (3)

An extrusion molded portion is formed in a gap formed by the outer surface of the green case disposed between the vulcanization mold and the bladder located inside the vulcanization mold and the molding surface of the vulcanization mold. Injecting unvulcanized tread rubber extruded using
After injecting the unvulcanized tread rubber into the gap, vulcanizing the unvulcanized tread rubber;
A method for manufacturing a tire, comprising: 2. The tire manufacturing method according to claim 1, wherein the diameter of the bladder is expanded and the green case is pressed while the unvulcanized tread rubber is injected into the gap. A vulcanization mold having a molding surface that defines the outer shape of the tire, a bladder capable of expanding and contracting so as to press the tire radially outward, and an extrusion molding section for extruding unvulcanized tread rubber. A tire manufacturing apparatus comprising:
The vulcanization mold is a tire manufacturing apparatus including a joint portion connectable to the extrusion molding portion, and an inflow passage through which unvulcanized tread rubber flows from the outside to the inside of the vulcanization die.

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