JP6977482B2 - Manufacturing method of rubber parts for tires - Google Patents

Description

The present invention relates to a manufacturing method for forming an annular rubber member for a tire.

Conventionally, a manufacturing method for forming an annular rubber member for a tire by attaching an unvulcanized rubber strip extruded from a rubber extruder to a rotating wrapped body using an applicator has been known. ing.

For example, Patent Document 1 below describes a method for manufacturing a rubber member for a tire, in which a rubber strip extruded by the operation of a gear pump arranged in a rubber extruder is attached to a rotating wrapped body by using an applicator. Proposed. In the manufacturing method of Patent Document 1, when the rotation of the wound body and the supply of the rubber strip by the applicator are stopped, the operation of the gear pump is stopped and the extrusion of the rubber strip is stopped.

Japanese Unexamined Patent Publication No. 2014-069561

In the manufacturing method of Patent Document 1, when the operation of the gear pump is stopped and then the operation of the gear pump is restarted to form the next rubber member for a tire, the width of the rubber strip immediately after being extruded becomes non-uniform. There was a problem that a part (also called a stop mark) was generated. Since such a non-uniform portion may deteriorate the quality of the rubber member for the tire, it was discharged without being used for forming the rubber member for the tire. Therefore, the manufacturing method of Patent Document 1 requires time for discharging the non-uniform portion, and the discharged rubber strip is also discarded, so that a lot of time loss and physical loss occur. Was.

The present invention has been devised in view of the above circumstances, and an object of the present invention is to provide a manufacturing method capable of efficiently forming a rubber member for a tire.

The present invention is a manufacturing method for attaching an unvulcanized rubber strip to a rotating rubberized body to form an annular rubber member for a tire, in which a rubber material extruded by a rubber extruder is used as a gear pump. The rubber strip for tires is supplied to a predetermined position on the wound body by using an applicator and an extrusion step of ejecting and continuously extruding the rubber strip. A winding step of forming the member, and a stop step of stopping the rotation of the wrapped body and the supply of the rubber strip by the applicator after the rubber member for the tire is formed on the wound body. The extrusion step is characterized in that during the stop step, the rubber strip is continuously extruded without stopping the operation of the gear pump.

In the method for manufacturing a rubber member for a tire of the present invention, in the extrusion process, the gear pump is operated at the first speed during the winding process, and the gear pump is operated at the first speed during the stopping process. It is desirable to include a second operation step of operating at a second speed smaller than one speed.

In the method for manufacturing a rubber member for a tire of the present invention, the extrusion step includes a deceleration step of gradually decelerating the operation of the gear pump from the first speed to the second speed during the stop step. desirable.

In the method for manufacturing a rubber member for a tire of the present invention, it is desirable that the deceleration step decelerates the operation of the gear pump step by step in at least two steps.

In the method for manufacturing a rubber member for a tire of the present invention, it is desirable that the second speed is 0.5 rpm or less.

In the method for manufacturing a rubber member for a tire of the present invention, it is desirable that the stopping step activates a festoon for stocking the rubber strip extruded from the gear pump to increase the stock amount of the festoon.

The method for manufacturing a rubber member for a tire of the present invention is a method of ejecting a rubber material extruded by a rubber extruder by operating a gear pump to continuously extrude the rubber strip, and an applicator. After the winding step of supplying the rubber strip to a predetermined position on the wound body to form the tire rubber member and after the tire rubber member is formed on the wound body. It includes the rotation of the wound body and the stopping step of stopping the supply of the rubber strip by the applicator.

In such a method for manufacturing a rubber member for a tire, the rubber member for a tire is formed from a rubber strip, so that the rubber member for a tire having a desired shape can be easily formed. Further, after the tire rubber member is formed, the tire rubber member can be safely removed from the wound body.

In the method for manufacturing a rubber member for a tire of the present invention, the extrusion process continues to extrude the rubber strip without stopping the operation of the gear pump during the stop process. In such an extrusion process, non-uniform parts of the rubber strip due to the stoppage of the operation of the gear pump do not occur. Therefore, in the method for manufacturing a rubber member for a tire of the present invention, it is not necessary to discharge the non-uniform portion of the rubber strip, so that the rubber member for a tire can be efficiently formed.

It is a schematic diagram which shows one Embodiment of the manufacturing apparatus of the rubber member for a tire used in this invention. It is a flowchart which shows one Embodiment of the manufacturing method of the rubber member for a tire of this invention. It is a flowchart about the operation of the gear pump of the extrusion process. It is a graph which shows the deceleration process.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic view showing an example of a manufacturing apparatus 1 for a tire rubber member G1 used in the method for manufacturing a tire rubber member G1 according to the present embodiment. As shown in FIG. 1, the manufacturing apparatus 1 of the rubber member G1 for a tire of the present embodiment has an extrusion device 2 for extruding the rubber strip G2 and a winding for forming the rubber member G1 for a tire from the rubber strip G2. It includes a rubber wheel 3.

The manufacturing apparatus 1 of the rubber member G1 for a tire further includes a calendar 4 for uniformly adjusting the shape of the rubber strip G2 extruded from the extruding apparatus 2, and a festival 5 for stocking the extruded rubber strip G2. It is desirable to include it.

The extruder 2 of the present embodiment includes a rubber extruder 6 that extrudes the rubber material G3 while kneading it, and a gear pump 7 for discharging the rubber material G3 extruded by the rubber extruder 6 to the outside of the extruder 2. I'm out.

The rubber extruder 6 includes, for example, a barrel 6A having a substantially cylindrical shape and a screw 6B arranged in the barrel 6A. It is desirable that the rubber extruder 6 operates the screw 6B at a substantially constant speed in order to stabilize the quality of the rubber material G3.

The gear pump 7 includes, for example, a casing 7A, a pair of gears 7B arranged in the casing 7A, and a base portion 7C for discharging the rubber material G3. It is desirable that the gear pump 7 is configured so that the operating speed of the gear 7B can be freely changed in order to change the discharge amount of the rubber material G3 according to the operating state of the device on the downstream side of the extruder 2.

The calendar 4 includes, for example, a pair of calendar rolls 4A. It is desirable that the pair of calendar rolls 4A are configured so that the distance between the axes can be freely changed. In such a calendar 4, the shape of the rubber strip G2 can be uniformly adjusted by inserting the rubber strip G2 between the pair of calendar rolls 4A.

The festival 5 stocks the rubber strip G2 by, for example, passing the rubber strip G2 between the first support portion 5A and the second support portion 5B. The first support portion 5A of the present embodiment is arranged above the festival 5, and its position is fixed. It is desirable that the second support portion 5B is arranged below the first support portion 5A and is configured to be movable in the vertical direction.

The winding device 3 of the present embodiment includes a rotating wound body 8 and an applicator 9 that supplies the rubber strip G2 to a predetermined position on the wound body 8.

The wound body 8 is, for example, a drum 8B supported by the support 8A. The wound body 8 may be a rigid core. It is desirable that the wound body 8 is rotatably configured by a motor (not shown).

The applicator 9 includes, for example, a conveyor 9A capable of supplying the rubber strip G2. It is desirable that the conveyor 9A is configured to be movable in the vertical direction and the axial direction of the conveyor 9A, and can be changed to a predetermined position with respect to the wound body 8. In such an applicator 9, the rubber strip G2 can be attached onto the wound body 8 to form an annular tire rubber member G1 having a desired shape.

Next, with reference to FIG. 1, a method for manufacturing the rubber member G1 for a tire according to the present embodiment will be described using the above-mentioned manufacturing apparatus 1 for the rubber member G1 for a tire. In the method for manufacturing the rubber member G1 for a tire of the present embodiment, the unvulcanized rubber strip G2 is attached to the rotating wound body 8 to form an annular rubber member G1 for a tire.

FIG. 2 is a flowchart of a method for manufacturing the rubber member G1 for a tire according to the present embodiment. As shown in FIG. 2, the manufacturing method of the present embodiment includes an extrusion step S1 for continuously extruding a rubber strip G2, a winding step S2 for forming a rubber member G1 for a tire, and a rubber strip G2 by an applicator 9. At least includes a stop step S4 for stopping the supply of the tire. In the manufacturing method of the present embodiment, the extrusion step S1 and the winding step S2 and the stopping step S4 are performed in parallel.

In the extrusion step S1, for example, the rubber material G3 is extruded to the gear pump 7 by operating the rubber extruder 6 at a substantially constant speed. In the extrusion step S1 of the present embodiment, the rubber material G3 extruded by the rubber extruder 6 is discharged by the operation of the gear pump 7, and the rubber strip G2 is continuously extruded from the base portion 7C thereof in a predetermined cross-sectional shape.

In the winding step S2 of the present embodiment, the rubber strip G2 extruded by the operation of the gear pump 7 is supplied to a predetermined position on the rotating wound body 8 by using the applicator 9, and the rubber member for the tire is supplied. Form G1. In the winding step S2, for example, the position of the conveyor 9A of the applicator 9 can be moved in the vertical direction and the axial direction of the conveyor 9A to form the rubber member G1 for a tire having a desired shape.

In the stop step S4 of the present embodiment, after the annular tire rubber member G1 is formed on the wound body 8, the rotation of the wound body 8 and the supply of the rubber strip G2 by the applicator 9 are stopped. In the stop step S4, the operator cuts the rubber strip G2 and then reduces the diameter of the wrapped body 8 to reduce the diameter of the wrapped body 8 to form a tire rubber member G1 on the wrapped body 8. Can be removed. When the wound body 8 is a rigid core, the rigid core on which the tire rubber member G1 is formed may be removed from the support 8A.

In such a method of manufacturing the rubber member G1 for a tire, since the rubber member G1 for a tire is formed from the rubber strip G2, the rubber member G1 for a tire having a desired shape can be easily formed. Further, after the tire rubber member G1 is formed, the tire rubber member G1 can be easily removed from the wound body 8.

In the extrusion process S1 of the present embodiment, the rubber strip G2 is continuously extruded without stopping the operation of the gear pump 7 during the stop process S4. In such an extrusion step S1, a non-uniform portion of the rubber strip G2, which tends to occur when the operation of the gear pump 7 is stopped and restarted, does not occur. Therefore, in the method for manufacturing the rubber member G1 for a tire of the present embodiment, it is not necessary to discharge the non-uniform portion of the rubber strip G2, so that the rubber member G1 for a tire can be efficiently formed.

FIG. 3 is a flowchart relating to the operation of the gear pump 7 in the extrusion process S1. As shown in FIG. 3, in the extrusion step S1 of the present embodiment, first, a speed increasing step S11 for accelerating the operation of the gear pump 7 to the first speed SP1 is performed. Here, the first speed SP1 is the rotation speed of the gear 7B of the gear pump 7 that discharges the rubber strip G2 while the rubber strip G2 is being supplied by the applicator 9 in the winding step S2.

In the speed increasing step S11, for example, the operation of the gear pump 7 is gradually increased. It is desirable that the speed increasing step S11 is gradually increased in at least two steps. Such a speed increasing step S11 can suppress a large change in the operating speed of the gear pump 7, and can further stabilize the quality of the rubber strip G2.

The speed increasing step S11 of the present embodiment is repeated until the operating speed of the gear pump 7 reaches the first speed SP1 (S12). In the extrusion step S1, it is desirable that the first operation step S13 is performed when the operation speed of the gear pump 7 becomes the first speed SP1. In the extrusion process S1, if the operating speed of the gear pump 7 at the start of the extrusion process S1 is the first speed SP1, the speed increasing step S11 is omitted.

In the first operation step S13 of the present embodiment, the gear pump 7 is operated at the first speed SP1 during the winding step S2. It is desirable that the first speed SP1 is appropriately set according to the supply status of the rubber strip G2 by the applicator 9. In such a first operation step S13, the rubber strip G2 can be extruded according to the amount of the rubber strip G2 supplied in the winding step S2.

The first operation step S13 is repeated, for example, until the winding step S2 is completed and the stop step S4 is performed (S14). In the extrusion step S1, it is desirable that a deceleration step S15 for decelerating the operation of the gear pump 7 from the first speed SP1 to the second speed SP2 is performed during the stop step S4.

FIG. 4 is a graph showing an example of the deceleration step S15. As shown in FIG. 4, the deceleration step S15 gradually decelerates, for example, the operation of the gear pump 7. The deceleration step S15 is decelerated stepwise in at least two steps, and in the present embodiment, in three steps. Such a deceleration step S15 can suppress a large change in the operating speed of the gear pump 7, and can further stabilize the quality of the rubber strip G2.

The deceleration step S15 of the present embodiment decelerates the operation of the gear pump 7 to the third speed SP3 when the stop step S4 is started. The third speed SP3 is, for example, 50% to 90% of the first speed SP1. In the deceleration step S15, it is desirable that the operation of the gear pump 7 at the third speed SP3 is continued from the start of deceleration from the first speed SP1 until the first time t1 elapses.

The deceleration step S15 of the present embodiment decelerates the operation of the gear pump 7 to the fourth speed SP4, which is smaller than the third speed SP3, after the lapse of the first time t1. The fourth speed SP4 is, for example, 10% to 60% of the first speed SP1. In the deceleration step S15, it is desirable that the operation of the gear pump 7 at the fourth speed SP4 is continued from the start of deceleration from the third speed SP3 until the second time t2 elapses. The second time t2 is set to, for example, 0.5 to 1.5 times the first time t1.

The deceleration step S15 of the present embodiment decelerates the operation of the gear pump 7 to the fifth speed SP5, which is smaller than the fourth speed SP4, after the lapse of the second time t2. The fifth speed SP5 is, for example, 5% to 30% of the first speed SP1. In the deceleration step S15, it is desirable that the operation of the gear pump 7 at the fifth speed SP5 is continued from the start of deceleration from the fourth speed SP4 until the third time t3 elapses. The third time t3 is set to, for example, 5 to 15 times the first time t1.

In the deceleration step S15 of the present embodiment, after the lapse of the third time t3, the operation of the gear pump 7 is made smaller than the fifth speed SP5, and the operation is decelerated to the second speed SP2 which is the operation speed of the gear pump 7 in the stop step S4. Such a deceleration step S15 is suitable for continuing the extrusion of the rubber strip G2 without stopping the operation of the gear pump 7.

As shown in FIGS. 2 and 3, the deceleration step S15 of the present embodiment is repeated until the operating speed of the gear pump 7 reaches the second speed SP2 (S17). In the extrusion step S1, it is desirable that the second operation step S18 is performed when the operation speed of the gear pump 7 becomes the second speed SP2. The extrusion step S1 ends the deceleration step S15 as soon as the next winding step S2 is started, and the next extrusion step S1 is started (S16).

In the second operation step S18 of the present embodiment, the gear pump 7 is operated at the second speed SP2, which is smaller than the first speed SP1, during the stop step S4. The second speed SP2 is preferably 0.5 rpm or less. Such a second operation step S18 is suitable for continuing the extrusion of the rubber strip G2 without stopping the operation of the gear pump 7.

In the winding step S2, for example, the amount of the rubber strip G2 supplied in the winding step S2 and the amount of the rubber strip G2 extruded in the first operation step S13 of the extrusion step S1 are set to be substantially equal. In the winding step S2 when the extrusion step S1 is the first operation step S13, the amount of the rubber strip G2 stocked in the festival 5 does not change. Therefore, in the winding step S2, it is not necessary to operate the festival 5 when the extrusion step S1 is the first operation step S13.

The winding step S2 is repeated until the formation of the tire rubber member G1 on the wound body 8 is completed (S3). In the method for manufacturing the tire rubber member G1 of the present embodiment, when the formation of the tire rubber member G1 on the wound body 8 is completed, the stop step S4 for stopping the supply of the rubber strip G2 is performed.

In the stop step S4, for example, the festoon 5 for stocking the rubber strip G2 extruded from the gear pump 7 is operated to increase the stock amount of the festoon 5. In such a stop step S4, the supply of the rubber strip G2 on the downstream side of the festival 5 can be stopped while the rubber strip G2 is continuously extruded without stopping the operation of the gear pump 7.

In the manufacturing method of the present embodiment, it is determined whether or not the rubber member G1 for a tire to be formed next is present after the stop step S4 (S5). In the present embodiment, when the rubber member G1 for a tire to be formed next is present, the next winding step S2 is started. In this case, the extrusion step S1 also starts the next extrusion step S1. If there is no tire rubber member G1 to be formed next, a series of steps is completed.

The increase in the rubber strip G2 stocked in the festival 5 can be decreased, for example, in the speed-increasing step S11 of the next extrusion step S1. In the next winding step S2, when the stock amount of the rubber strip G2 of the festival 5 reaches a specified amount, it is desirable that the next extrusion step S1 performs the first operation step S13.

It should be noted that during the stop step S4, setup changes for forming different rubber members G1 for tires and maintenance of the winding device 3 may be performed. In such a case, the time of the stop step S4 is long, and the stock amount of the rubber strip G2 of the festival 5 may exceed the upper limit during the stop step S4. If the stock amount of the rubber strip G2 of the festival 5 exceeds the upper limit, the applicator 9 may be operated to reduce the rubber strip G2 stocked in the festival 5 to a specified amount.

Although the particularly preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the above-described embodiment and can be modified into various embodiments.

6 Rubber extruder 7 Gear pump 8 Winding body 9 Applicator S1 Extrusion process S2 Winding process S4 Stop process G1 Rubber member for tire G2 Rubber strip G3 Rubber material

Claims (5)

It is a manufacturing method for attaching an unvulcanized rubber strip to a rotating object to form an annular rubber member for a tire.
An extrusion process in which the rubber material extruded by the rubber extruder is discharged by the operation of a gear pump to continuously extrude the rubber strip.
Using an applicator, the extruded rubber strip is supplied to a predetermined position on the wound body to form the rubber member for the tire, and a winding step.
A step of stopping the rotation of the wrapped body and the supply of the rubber strip by the applicator after the rubber member for the tire is formed on the wrapped body is included.
In the extrusion process, during the stop process, the rubber strip is continuously extruded without stopping the operation of the gear pump .
In the extrusion process, a first operation step of operating the gear pump at a first speed during the winding process and a second speed of operating the gear pump at a second speed smaller than the first speed during the stop process are performed. Including 2 operation processes
The extrusion step includes a deceleration step of decelerating the operation of the gear pump from the first speed to the second speed during the stop step.
The deceleration step decelerates the operation of the gear pump when the stop step is started .
A method for manufacturing rubber members for tires. The method for manufacturing a rubber member for a tire according to claim 1 , wherein the deceleration step decelerates the operation of the gear pump step by step in at least two steps. The method for manufacturing a rubber member for a tire according to claim 1 or 2 , wherein the second speed is 0.5 rpm or less. The method for manufacturing a rubber member for a tire according to any one of claims 1 to 3, wherein the extrusion step operates the rubber extruder at a constant speed. The rubber member for a tire according to any one of claims 1 to 4 , wherein the stopping step activates a festoon for stocking the rubber strip extruded from the gear pump to increase the stock amount of the festoon. Production method.

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