JP2013059985A - Grooving device of member for tire molding, apparatus and method for manufacturing member for tire molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique that can replace the grooving roll without stopping the production equipment of the sheet-like unvulcanized rubber.SOLUTION: The device has a grooving roll including a projection and forms an air release groove on an unvulcanized rubber surface by arranging a grooving roll at a grooving position where the projection can be pressed against the sheet-like unvulcanized rubber surface transported along the conveyance path. The device includes: a rotary shaft; a plurality of kinds of grooving roll that can be installed to the rotary shaft; a lifting means to make the grooving roll go into the grooving position or retract by lifting and lowering the rotary shaft. When changing the grooving roll in the grooving position to another grooving roll, the device retreats the grooving roll from the grooving position by lifting the rotary shaft, and after rotating the rotary shaft, arranges the other grooving roll to the grooving position by lowering the rotary shaft, and when not using the grooving roll, retreats the grooving roll from the grooving position by lifting the rotary shaft.

Description

  The present invention relates to a grooving device for a tire molding member that forms an air escape groove on the surface of a sheet-like unvulcanized rubber, a manufacturing apparatus and a manufacturing method for a tire molding member.

  The raw cover before vulcanization molding of the tire is formed by pasting multiple types of unvulcanized rubber such as IL (inner liner), insulation, BES (breaker edge strip), etc. There is a problem that air remains sealed between the vulcanized rubbers.

  Further, when the sheet-like unvulcanized rubber has a two-layer structure, there is a problem that air remains sealed when the sheet is doubled in the production of the sheet-like unvulcanized rubber (for example, Patent Document 1).

  In order to release the remaining air to the outside, pre-pricking, ply-pricking, etc. are performed, but the holes opened by the pre-kicking etc. are blocked at the time of tire molding, so the air cannot be released sufficiently There is a problem. Further, there is a method of putting an identification yarn (bleeder yarn) on the TOP side, but a sufficient effect is not obtained.

  Therefore, a technique has been proposed in which a grooved roll is arranged in a production line for a sheet-like unvulcanized rubber, and an air escape groove is formed on the surface of the sheet-like unvulcanized rubber while conveying the unvulcanized rubber ( For example, Patent Document 2).

  However, in the conventional case, when it becomes necessary to replace the grooving roll with a grooving roll of another groove pattern during the manufacturing process, it is necessary to stop the production equipment and perform the grooving roll replacement work. there were.

JP 2010-173223 A JP 2005-145011 A

  In view of the above problems, an object of the present invention is to provide a technique capable of exchanging the grooving roll without stopping the production facility for the sheet-like unvulcanized rubber.

The invention described in claim 1
It has a grooving roll in which ridges for groove formation are formed on the outer peripheral surface of the roll, and the grooving position can press the ridges on the surface of the sheet-like unvulcanized rubber conveyed along the conveyance path. By arranging a grooving roll, a tire molding member grooving device that forms an air escaping groove on the surface of the unvulcanized rubber sheet,
A rotating shaft arranged so that an axial direction coincides with a width direction of the transport path;
A plurality of types of the grooving rolls that are attached to the rotary shaft at appropriate intervals around the axis of the rotary shaft, and the rotary shaft is moved up and down to allow the grooving roll to enter the grooving position or from the grooving position. Elevating means for evacuation,
When changing the grooving roll at the grooving position to another grooving roll, the rotary shaft is raised by the elevating means to retract the grooving roll at the grooving position from the grooving position, and the rotation After rotating the shaft, by lowering the rotating shaft by the lifting means, another grooving roll is arranged at the grooving position,
When the grooved roll is not used, the rotating shaft is raised by the elevating means so that all the grooved rolls are retracted from the grooved position. Grooving device.

The invention described in claim 2
A rolling means for rolling unvulcanized rubber into a sheet shape, and a groove forming means for forming an air escape groove on the surface of the sheet-shaped unvulcanized rubber using the groove forming device for a tire forming member according to claim 1. And a winding means for winding up the sheet-like unvulcanized rubber in which an air escape groove is formed.

The invention according to claim 3
The grooved roll is provided with a groove in an oblique direction from the center in the width direction of the sheet-like unvulcanized rubber toward the upstream side of conveyance to form the groove for air escape having a V-shape in plan view. It is a manufacturing apparatus of the member for tire fabrication of Claim 2 characterized by the above-mentioned.

The invention according to claim 4
A tire molding member manufacturing method using the tire molding member manufacturing apparatus according to claim 2 or 3,
During the conveyance of the production line for the sheet-like unvulcanized rubber, the rotator is rotated to change the grooving roll at the grooving position to another grooving roll, or all the grooving rolls by the lifting means The tire molding member is manufactured by retracting the tire from the grooved position.

  According to the present invention, there is provided a tire molding member grooving device, a tire molding member manufacturing apparatus, and a manufacturing method capable of replacing a grooving roll without stopping production equipment for sheet-like unvulcanized rubber. can do.

It is a figure which shows typically the manufacturing apparatus of the member for tire shaping | molding of embodiment of this invention. 1 is a side view schematically showing a grooving device for a tire molding member according to an embodiment of the present invention. It is a top view which shows the sheet-like unvulcanized rubber in which the groove | channel for air escape was formed. It is a figure which shows typically the manufacturing apparatus of the member for tire shaping | molding of other embodiment of this invention.

(1) Manufacturing Line of Tire Molding Member Manufacturing Apparatus FIG. 1 is a diagram schematically showing a tire molding member manufacturing apparatus according to the present embodiment. As shown in FIG. 1, a tire molding member manufacturing apparatus includes a calendar 11 having first and second calendar portions 111 and 112, a tire molding member grooving device 1, a pull roll 12, and a cooling drum. 13, a winding conveyor 14, and control means (not shown) for controlling the entire apparatus.

  The production line of the tire molding member production apparatus is configured to roll unvulcanized rubber at a high temperature by the first and second calendar portions 111 and 112 to form the sheet-like unvulcanized rubber 3a and 3b, and then pull rolls. 12, the sheet-like unvulcanized rubber 3 a and 3 b are overlapped to form the sheet-like unvulcanized rubber 3, the sheet-like unvulcanized rubber 3 is cooled by the cooling drum 13, and the sheet-like unvulcanized rubber 3 is cooled by the winding conveyor 14. The vulcanized rubber 3 is wound up.

(2) Tire forming member grooving device The present embodiment is characterized in that a tire forming member grooving device 1 described below is arranged in the middle of the production line.

(A) Configuration of Tire Forming Member Grooving Device FIG. 2 is a side view schematically showing a tire shaping member grooving device according to an embodiment of the present invention. As shown in FIG. 2, the tire molding member grooving apparatus 1 includes a rotating shaft 2g disposed in the conveyance path of the sheet-like unvulcanized rubber 3a so that the axial direction matches the width direction of the conveyance path; The two grooving rolls 2 and 2 'supported by the supports 2e and 2f, the support roll 2b, a rotation drive means (not shown) for rotating the rotary shaft 2g, and a rotary drive means (not shown) for raising and lowering the rotary shaft 2g. And a lifting cylinder.

  On the roll outer peripheral surface of the grooving rolls 2 and 2 ', protrusions 2m and 2n having different shapes for forming an air escape groove on the surface of the sheet-like unvulcanized rubber 3a are formed.

  The grooving rolls 2 and 2 'are arranged with an interval of 180 degrees around the axis of the rotating shaft 2g. Three or more grooving rolls each having a different grooving pattern may be arranged, but it is preferably four or less.

(B) Explanation of operation of the grooving device When the grooving roll 2 is positioned at the grooving position, the rotary shaft 2g is rotated by a rotation driving means constituted by a motor, a transmission mechanism, etc. After positioning the grooving roll 2 directly above the rubber 3a, the rotary shaft 2g is lowered by the elevating cylinder.

  Thereafter, when the other grooving roll 2 ′ is positioned at the grooving position, the rotary shaft 2g is raised by the elevating cylinder so that the grooving roll 2 at the grooving position is retracted from the grooving position and then rotated. After rotating the shaft 2g and positioning the other grooved roll 2 'directly above the sheet-like unvulcanized rubber 3a, the rotating shaft 2g is lowered by the lifting cylinder.

  When the sheet-like unvulcanized rubber 3a is not grooved, the rotary shaft 2g is raised by the lifting cylinder to retract the grooved rolls 2, 2 'from the grooved position.

  As described above, it is possible to select whether or not to use a grooving roll and to select a grooving roll to be used without stopping the production facility.

(C) Groove pattern by grooving roll FIG. 3 is a plan view showing a sheet-like unvulcanized rubber in which an air escape groove is formed. As shown in FIG. 3, the groove pattern of the air escaping groove 4 attached to the sheet-like unvulcanized rubber 3a is such that a plurality of V-shaped grooves are arranged in the length direction of the sheet-like unvulcanized rubber 3a. Each V-shaped groove starts from the center in the width direction of the sheet-like unvulcanized rubber 3a, and is at an angle of 10 to 45 ° with respect to the center line of the sheet-like unvulcanized rubber 3a. It is formed in an oblique direction toward the transport upstream side of 3a.

(3) Manufacturing apparatus for tire molding member according to another embodiment FIG. 4 is a diagram schematically showing a manufacturing apparatus for a tire molding member according to another embodiment of the present invention.

  As shown in FIG. 4, in another embodiment of the present invention, the tire shaping member grooving device 1 is arranged on the cooling drum 13 on the downstream side of the pull roll 12, and the tire shaping member groove The grooving roll of the attaching device 1 sandwiches the sheet-like unvulcanized rubber 3 with the cooling drum 13. For this reason, it is not necessary to provide the support roll 2b of the grooving device 1 for the tire forming member.

  Thus, the installation location of the grooving device 1 for forming a tire is not particularly limited, but it is preferable that the temperature of the sheet-like unvulcanized rubber 3a is 60 ° C. or higher.

(4) Advantages of the above-described embodiment (a) In the above-described embodiment, a plurality of grooving rolls are arranged on a rotatable shaft and a grooving device for a tire molding member is configured. Therefore, the grooving roll can be easily replaced by rotating the rotating shaft. Further, when grooving is unnecessary, it can be dealt with by raising the grooving device. As a result, it is not necessary to stop the production facility when replacing the grooving roll, and this can greatly contribute to the improvement of productivity.

(B) Further, the installation position of the grooving device is not limited to a conventional roll head, and between the calendar roll and the pull roll or on the cooling drum, and the rubber material temperature is 60 ° C. or more. If there is, it can be installed freely and the installation space can be utilized efficiently.

(C) In particular, by forming a V-shaped air relief groove in the sheet-like unvulcanized rubber, sufficiently reducing the occurrence of air residue when pasting with other sheet-like unvulcanized rubber. In addition, the sheet-like unvulcanized rubber can be stretched and the occurrence of defects can be effectively reduced.

  In this example, workability was compared between the above-described rotary grooving apparatus having a plurality of grooving rolls and the conventional grooving apparatus having only one grooving roll. Is.

  First, two grooving rolls A and B in which predetermined grooves different from each other were provided on the roll surface of Φ148 mm × W1000 mm were prepared.

  The two grooving rolls were attached to symmetrical positions with the rotation axis as the center to obtain the grooving apparatus of Example 1.

  As shown in FIG. 1, the grooving device was disposed between a calendar roll and a pull roll to produce a sheet-like unvulcanized rubber. At the time of production, a predetermined length of grooving was first performed by the grooving roll A and then changed to the grooving roll B to produce a sheet-like unvulcanized rubber.

  At this time, the rotation from the grooving roll A to the grooving roll B could be performed without any trouble by rotating the rotating shaft without stopping the production apparatus. The time required for the rotation of the rotating shaft was about 15 seconds.

  On the other hand, when a conventional grooving apparatus having one grooving roll is used, it is necessary to stop the production apparatus and replace the grooving roll A with the grooving roll B. It took about 30 minutes.

  As a result, by using a grooving device having a plurality of grooving rolls, the time for replacing the grooving rolls becomes almost unnecessary, and replacement work is also unnecessary, which greatly contributes to the improvement of productivity. I was able to confirm that it was possible.

  In the present embodiment, the relationship between the groove shape and the air remaining in the grooving roll is compared.

  On the roll surface of Φ148 mm × W1000 mm, the groove interval is 15 mm, the groove angle is 45 degrees, and the groove height is 1 mm with respect to the roll circumferential direction of the V-shaped groove extending obliquely from the center in the roll width direction to the left and right sides. A grooving roll C provided with grooves and a grooving roll D provided with grooves having a groove interval of 2 mm, a groove angle of 30 °, and a groove height of 1 mm on the same size roll surface are symmetrical about the rotation axis. The grooved device of Example 2 was obtained.

  In the same manner as in Example 1, the grooving device was disposed between a calendar roll and a pull roll to produce an insulation. In addition, the grooving roll C was used as the grooving roll. As a result, an insulation in which a V-shaped groove was formed on one side was obtained.

  The obtained insulation was bonded to a separately prepared ply with the grooved surface inside, and the degree of air leakage, that is, the state of remaining air was observed to determine the incidence of light defects. The minor defects mentioned here are defects such as air remaining at the insulation side (A / IN side), air remaining at the installation center (A / IN center), and air remaining at the inner liner joint (A / INJ). Pointing.

  Similarly, the bead is produced, and the grooved surface is placed on the inside, and is bonded to a separately produced tie gum, and the degree of air leakage, that is, the state of the remaining air is observed, and minor defects are generated. The rate was determined. In addition, the light defect here refers to defects, such as the air remaining (A / BD toe) in a bead toe.

  Thereafter, two types of tires, SP and ST, were produced using the laminated sheet-like unvulcanized rubber.

  In the case of this example, the incidence of light defects was 0.014%.

  In addition, it was confirmed that when the V-shaped grooves were appropriately formed, the resistance due to the roll pressure bonding was eased during bonding, and the wrinkles of the sheet-like unvulcanized rubber were stretched.

  As a comparative example, a sheet-like unvulcanized rubber similar to that of Example 2 was prepared using a roll having the same size and not provided with a groove, and the incidence of light defects was similarly determined. In the case of this comparative example, the incidence of light defects was 0.045%.

  From the above results, it was confirmed that the occurrence of minor defects can be significantly reduced in the case of this example. As described above, since the V-shaped groove is appropriately formed on the sheet-like unvulcanized rubber, air is sequentially sent to the side via the formed groove, and the air remaining It is considered that the occurrence of the above has been reduced.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to said embodiment. Various modifications can be made to the above-described embodiment within the same and equivalent scope as the present invention.

DESCRIPTION OF SYMBOLS 1 Tire shaping member grooving apparatus 2, 2 'Grooving roll 2b Support roll 2e, 2f Support body 2g Rotating shaft 2m, 2n Projection 3, 3a, 3b Sheet-like unvulcanized rubber 4 Air escape groove 11 Calendar 12 Pull roll 13 Cooling drum 14 Winding conveyor 111 First calendar section 112 Second calendar section

Claims (4)

It has a grooving roll in which ridges for groove formation are formed on the outer peripheral surface of the roll, and the grooving position can press the ridges on the surface of the sheet-like unvulcanized rubber conveyed along the conveyance path. By arranging a grooving roll, a tire molding member grooving device that forms an air escaping groove on the surface of the unvulcanized rubber sheet,
A rotating shaft arranged so that an axial direction coincides with a width direction of the transport path;
A plurality of types of the grooving rolls that are attached to the rotary shaft at appropriate intervals around the axis of the rotary shaft, and the rotary shaft is moved up and down to allow the grooving roll to enter the grooving position or from the grooving position. Elevating means for evacuation,
When changing the grooving roll at the grooving position to another grooving roll, the rotary shaft is raised by the elevating means to retract the grooving roll at the grooving position from the grooving position, and the rotation After rotating the shaft, by lowering the rotating shaft by the lifting means, another grooving roll is arranged at the grooving position,
When the grooved roll is not used, the rotating shaft is raised by the elevating means so that all the grooved rolls are retracted from the grooved position. Grooving device.   A rolling means for rolling unvulcanized rubber into a sheet shape, and a groove forming means for forming an air escape groove on the surface of the sheet-shaped unvulcanized rubber using the groove forming device for a tire forming member according to claim 1. And a wind-up means for winding up the sheet-like unvulcanized rubber in which the air escape groove is formed.   The grooved roll is provided with a groove in an oblique direction from the center in the width direction of the sheet-like unvulcanized rubber toward the upstream side of conveyance to form the groove for air escape having a V-shape in plan view. The apparatus for manufacturing a tire molding member according to claim 2, wherein A tire molding member manufacturing method using the tire molding member manufacturing apparatus according to claim 2 or 3,
During the conveyance of the production line for the sheet-like unvulcanized rubber, the rotator is rotated to change the grooving roll at the grooving position to another grooving roll, or all the grooving rolls by the lifting means The tire molding member is produced by retracting the tire from the grooved position.

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