JP2017105078A - Rubber member molding method and rubber member molding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber member molding method and a rubber member molding device capable of extrusion molding a plurality of rubber members having same cross section shape from one extruder at same time.SOLUTION: There is provided a rubber member molding method for extrusion molding a plurality of rubber members A and B having same cross section shape from one extruder at same time, having a process for measuring weight corresponding to rubber amount regarding each rubber members A and B extruded from the extruder 1 and a process for controlling transportation speed of transportation rollers 31 and 32 for transporting each of rubber members A and B after the measurement.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rubber member molding method and a rubber member molding apparatus for simultaneously extruding a plurality of rubber members having the same cross-sectional shape from one extruder.

  Generally, when manufacturing pneumatic tires, each tire component such as inner liner, sidewall, bead, and tread is bonded together in an unvulcanized state to form a green tire, which is then vulcanized. To make it.

  Among the tire constituent members, for example, the sidewall is formed by extruding a band-shaped rubber having a predetermined cross-sectional shape from an extruder, cutting it into a predetermined length, and joining the end portions thereof. Patent Document 1 below describes an extrusion molding machine that can maintain a substantially constant weight even under changing operating conditions.

  By the way, in order to manufacture a pneumatic tire with good uniformity, it is preferable to form the two sidewalls in the same shape as much as possible. At this time, it is conceivable to simultaneously extrude two sidewalls having the same cross-sectional shape from one extruder from the viewpoint of improving work efficiency. However, the two sidewalls extruded at the same time may have a shape difference depending on the rotational direction of the screw, the amount of wear of the screw, the rubber viscosity of the day, and the like.

Japanese Patent Laid-Open No. 10-6382

  Accordingly, an object of the present invention is to provide a rubber member molding method and a rubber member molding apparatus capable of simultaneously extruding a plurality of rubber members having the same cross-sectional shape from a single extruder.

The above object can be achieved by the present invention as described below.
That is, the rubber member molding method of the present invention is a rubber member molding method of simultaneously extruding a plurality of rubber members having the same cross-sectional shape from one extruder,
Measuring an index value corresponding to the amount of rubber for each rubber member extruded from the extruder; and
And a step of controlling a conveyance speed of each conveyance path for conveying each rubber member after the measurement based on the measured index value.

  When simultaneously extruding a plurality of rubber members from one extruder, there may be a difference in shape even if the rubber members are respectively extruded from a plurality of discharge ports having the same cross-sectional shape. In the present invention, an index value corresponding to the rubber amount is measured for each rubber member extruded from the extruder, and the conveyance speed of each conveyance path of each rubber member after measurement is controlled based on the measured index value. To do. For example, when the conveyance speed of the rubber member after measurement is increased, the amount of rubber conveyed increases, while the amount of rubber at the measurement point decreases, so the measured index value tends to decrease. Conversely, when the conveyance speed of the rubber member after measurement is slowed, the amount of rubber conveyed decreases, while the amount of rubber at the measurement point increases, so the measured index value tends to increase. Therefore, by controlling the conveyance speed based on the measured index value, the index value measured for each rubber member, that is, the rubber amount can be controlled. As a result, according to the present invention, it is possible to eliminate the shape difference between the plurality of rubber members, and it is possible to simultaneously extrude a plurality of rubber members having the same cross-sectional shape from one extruder.

  In the rubber member molding method of the present invention, the method further includes a step of presetting an index value corresponding to a target rubber amount as a target value, and the conveyance speed is controlled so as to bring the measured index value closer to the target value. It is preferable to do.

  In the rubber member molding method of the present invention, when the measured index value is lower than the target value, the transport speed is decreased, and when the measured index value is higher than the target value. It is preferable to increase the conveyance speed.

  According to these structures, a plurality of rubber members can be made exactly the same cross-sectional shape.

Further, in the rubber member molding method of the present invention, the method further comprises a step of winding the plurality of conveyed rubber members around one winding roller,
It is preferable that the winding speed of the winding roller is equal to or lower than the slowest transport speed among the transport speeds of a plurality of transport paths.

  In the rubber member molding method of the present invention, a plurality of rollers are disposed between the transport path and the winding roller, and the rubber member transported at a transport speed faster than the winding speed is between the plurality of rollers. It is preferable to form sagging.

  According to these configurations, a plurality of rubber members having different conveying speeds can be simultaneously wound on the winding roller.

Further, the rubber member molding apparatus of the present invention is a rubber member molding apparatus for simultaneously extruding a plurality of rubber members having the same cross-sectional shape from one extruder,
A measuring instrument that measures an index value corresponding to the amount of rubber for each rubber member extruded from the extruder;
A plurality of conveyance paths for conveying each rubber member, provided on the conveyance downstream side of the measuring instrument;
A control device for controlling the conveyance speed of each conveyance path based on the measured index value;
It is characterized by providing.

  The effect of the rubber member molding apparatus according to this configuration is the same as that of the rubber member molding method described above, and according to the present invention, it is possible to eliminate the shape difference between the plurality of rubber members, and from one extruder. A plurality of rubber members having the same cross-sectional shape can be simultaneously extruded.

Perspective view of rubber member molding equipment Functional block diagram showing a configuration example of a rubber member molding apparatus The figure which shows a mode that two or more rubber members are extrusion-molded

  Preferred embodiments of a rubber member molding method and a rubber member molding apparatus according to the present invention will be described with reference to the drawings.

<Rubber member molding device>
FIG. 1 is a perspective view showing the overall configuration of the rubber member molding apparatus. FIG. 2 is a functional block diagram showing a configuration example of the rubber member molding apparatus.

  In the present embodiment, an example is shown in which two rubber members, specifically, the first rubber member A and the second rubber member B are simultaneously extruded from one extruder 1. The first rubber member A and the second rubber member B are respectively extruded from two discharge ports 11 and 12 formed in a base 10 provided at the tip of the extruder 1. The discharge ports 11 and 12 have the same cross-sectional shape. The first rubber member A and the second member B are conveyed by different conveyance paths.

  The first rubber member A and the second rubber member B extruded from the extruder 1 are conveyed to the measurement region 2. In the measurement area 2, a first conveyor 21 for conveying the first rubber member A and a second conveyor 22 for conveying the second rubber member B are provided. Further, in the measurement region 2, a measuring instrument that measures an index value corresponding to the amount of rubber for each rubber member is installed. Here, the index value corresponding to the rubber amount is a physical property value having a correlation with the rubber amount, such as the weight of the rubber member, the width of the rubber member, and the thickness of the rubber member. In this embodiment, the 1st conveyor scale 23 and the 2nd conveyor scale 24 are each provided under the 1st conveyor 21 and the 2nd conveyor 22 as a measuring device. The first conveyor scale 23 can measure the weight of the first rubber member A placed on the first conveyor 21. The second conveyor scale 24 can measure the weight of the second rubber member B placed on the second conveyor 22. The weight measurement data of the first rubber member A measured by the first conveyor scale 23 and the weight measurement data of the second rubber member B measured by the second conveyor scale 24 are transmitted to the control device 60.

  A conveyance area 3 is provided on the conveyance downstream side of the measurement area 2. In the conveyance area 3, a plurality of first conveyance rollers 31 (corresponding to the conveyance path of the present invention) for conveying the first rubber member A and a plurality of second conveyance rollers 32 for conveying the second rubber member B are provided. (Corresponding to the conveyance path of the present invention) is provided. In addition, the number of the 1st conveyance rollers 31 and the 2nd conveyance rollers 32 is not limited to the thing of FIG. The 1st conveyance roller 31 and the 2nd conveyance roller 32 are rotationally driven by the motor not shown. The rotation speed of the first conveyance roller 31 and the rotation speed of the second conveyance roller 32 are controlled by the control device 60.

  An adjustment area 4 is provided on the conveyance downstream side of the conveyance area 3. In the adjustment area 4, when there is a speed difference between the conveyance speeds of the first rubber member A and the second rubber member B, the first rubber member A and the second rubber member B are simultaneously and appropriately placed in the winding area 5 described later. A process for enabling the take-up roller 50 to take up is performed. The adjustment region 4 includes a plurality of first adjustment rollers 41 for adjusting the conveyance speed of the first rubber member A and a plurality of second adjustment rollers 42 for adjusting the conveyance speed of the second rubber member B. Is provided. As described above, by providing the first adjustment roller 41 on the downstream side of the conveyance of the first conveyance roller 31, the first rubber is obtained when the conveyance speed of the first rubber member A is higher than the winding speed of the winding roller 50. A slack can be formed in the member A between the plurality of first adjustment rollers 41. Similarly, by providing the second adjustment roller 42 on the downstream side of the conveyance of the second conveyance roller 32, the second rubber member can be used when the conveyance speed of the second rubber member B is faster than the winding speed of the winding roller 50. A slack can be formed between the plurality of second adjustment rollers 42 in B. The plurality of first adjustment rollers 41 may be all drive rollers, but some may be drive rollers and others may be free rollers. Similarly, the plurality of second adjustment rollers 42 may be all drive rollers, but some may be drive rollers and others may be free rollers. The rotation speed of the first adjustment roller 41 and the rotation speed of the second adjustment roller 42 are controlled by the control device 60.

  A winding area 5 is provided on the conveyance downstream side of the adjustment area 4. In the winding area 5, the first rubber member A and the second rubber member B are wound around one winding roller 50. The winding roller 50 is rotatably supported on a cart (not shown). The winding roller 50 is rotationally driven by a motor (not shown). The rotation speed of the winding roller 50 is controlled by the control device 60.

  The control device 60 controls the conveyance speed of the first rubber member A by controlling the rotation speed of the first conveyance roller 31 based on the weight of the first rubber member A measured by the first conveyor scale 23. be able to. Similarly, the control device 60 controls the rotational speed of the second transport roller 32 based on the weight of the second rubber member B measured by the second conveyor scale 24, so that the transport speed of the second rubber member B is controlled. Can be controlled.

  Further, the control device 60 can control the winding speed of the first rubber member A and the second rubber member B by controlling the rotation speed of the winding roller 50.

  Further, a setting unit 61 is provided, and an index value corresponding to a target rubber amount can be set as a target value for the first rubber member A and the second rubber member B. In the present embodiment, the weight at which the first rubber member A and the second rubber member B have a desired cross-sectional shape is set as the target value.

<Rubber member molding method>
Next, a rubber member molding method using the rubber member molding apparatus will be described. The rubber member molding method of the present invention is a rubber member molding method for simultaneously extruding a plurality of rubber members having the same cross-sectional shape from one extruder, and the amount of rubber for each rubber member extruded from the extruder And a step of controlling the conveyance speed of each conveyance path for conveying each rubber member after measurement based on the measured index value.

  FIG. 3 shows a state in which the first rubber member A and the second rubber member B having the same cross-sectional shape are simultaneously extruded from one extruder 1. First, the 1st rubber member A and the 2nd rubber member B are extruded from the nozzle | cap | die 10 of the extruder 1 simultaneously. The first rubber member A and the second rubber member B are pushed out from the two discharge ports 11 and 12 of the base 10, respectively. Although the discharge ports 11 and 12 have the same cross-sectional shape, there may be a difference in shape between the first rubber member A and the second rubber member B. Specifically, a difference in weight, width, thickness, or the like may occur between the first rubber member A and the second rubber member B.

  The 1st rubber member A and the 2nd rubber member B which were extruded from the nozzle | cap | die 10 of the extruder 1 are sent to the 1st conveyor 21 and the 2nd conveyor 22, respectively. Here, the weight of the first rubber member A placed on the first conveyor 21 is measured by the first conveyor scale 23 provided below the first conveyor 21. Further, the weight of the second rubber member B placed on the second conveyor 22 is measured by the second conveyor scale 24 provided below the second conveyor 22. The weight measurement data measured by the first conveyor scale 23 and the second conveyor scale 24 is transmitted to the control device 60.

The first rubber member A and the second rubber member B whose weights are measured are sent to the first transport roller 31 and the second transport roller 32. The control device 60 controls the rotational speed of the first transport roller 31 on the basis of the weight measurement data related to the first rubber member A transmitted from the first conveyor scale 23, and the transport speed V of the first rubber member A. _A is controlled. Similarly, the control device 60 controls the rotational speed of the second transport roller 32 based on the weight measurement data related to the second rubber member B transmitted from the second conveyor scale 24, so that the second rubber member B controlling the conveying speed _{V B.} Incidentally, the speed difference between the conveying speed V _B of the conveying speed V _A of the first rubber member A second rubber member B is preferably within 5% ±. If the speed difference between the first rubber member A and the second rubber member B is greater than ± 5%, it is difficult to adjust the speed difference in the adjustment region 4.

Here, it is assumed that the rubber amount of the first rubber member A extruded from the extruder 1 for some reason is larger than the rubber amount of the second rubber member B. That is, it is assumed that the weight measured by the first conveyor scale 23 is larger than the weight measured by the second conveyor scale 24. At this time, the control device 60 increases the rotational speed of the first transport roller 31 to increase the transport speed of the first rubber member A (the new transport speed is set to V _A ′). As a result, the rubber amount of the first rubber member A conveyed by the first conveying roller 31 increases, while the rubber amount conveyed by the first conveyor 21 decreases. As a result, the rubber amount of the first rubber member A approaches the rubber amount of the second rubber member B.

  Further, the control device 60 can reduce the conveyance speed of the second rubber member B by decreasing the rotation speed of the second conveyance roller 32. As a result, the amount of rubber of the second rubber member B conveyed by the second conveying roller 32 decreases, while the amount of rubber conveyed by the second conveyor 22 increases. As a result, the rubber amount of the second rubber member B approaches the rubber amount of the first rubber member A.

  Further, the control device 60 increases the rotational speed of the first transport roller 31 to increase the transport speed of the first rubber member A, and decreases the rotational speed of the second transport roller 32 to transport the second rubber member B. The rubber amount of the first rubber member A and the second rubber member B may be brought closer to each other by slowing down the speed.

Thereafter, the first rubber member A and the second rubber member B are simultaneously wound around the winding roller 50. Winding speed of the take-up roller 50 V _C is less slowest conveying speed of the conveying speed of the plurality of transport paths. In the present embodiment, the winding speed V _C of the winding roller 50 is the same as the conveying speed V _B of the second rubber member B. Same as the winding speed V _C of the conveying speed V _B is the take-up roller 50 of the second rubber member B, as shown in FIG. 3, the second rubber member B is wound just proportion to the take-up roller 50 Go. On the other hand, since the conveying speed V _A ′ of the first rubber member A is faster than the winding speed V _C of the winding roller 50, the first rubber member A gradually moves between the first conveying roller 31 and the winding roller 50. There will be a surplus. In the present embodiment, since the plurality of first adjustment rollers 41 are disposed between the first conveyance roller 31 and the take-up roller 50, the first rubber member A is slack between the plurality of first adjustment rollers 41. Can be formed. In this embodiment, the conveyance speed V _B of the second rubber member B is the same as the conveyance speed V _C of the winding roller 50, but the conveyance speed V _B of the second rubber member B is the conveyance speed of the winding roller 50. If faster than the speed V _C, it is possible to form the slack between the plurality to the second rubber member B second adjustment roller 42 (see Figure 1).

  The rubber member molding method according to the present invention further includes a step of presetting an index value corresponding to a target rubber amount as a target value, and the conveyance speed so as to bring the measured index value closer to the target value. May be controlled. For example, the weight at which the first rubber member A and the second rubber member B have a desired cross-sectional shape is preset as a target value. If the weight of the second rubber member B measured by the second conveyor scale 24 is lower than the target value, the second conveying roller 32 is controlled to reduce the conveying speed of the second rubber member B. On the other hand, if the weight of the first rubber member A measured by the first conveyor scale 23 exceeds the target value, the first conveying roller 31 is controlled to increase the conveying speed of the first rubber member A. To do. Thereby, the weight of the 1st rubber member A and the 2nd rubber member B can be brought close to a target value.

<Other embodiments>
(1) In the above-described embodiment, an example in which a conveyor scale is used as a measuring instrument that measures an index value corresponding to the amount of rubber for each rubber member has been described. However, the measuring instrument has a width that measures the width of the rubber member. A sensor, a thickness sensor that measures the thickness of the rubber member, or the like may be used. A plurality of these measuring instruments may be used simultaneously. The positions where the width sensor and the thickness sensor are installed are between the first conveyor 21 and the first transport roller 31 and between the second conveyor 22 and the second transport roller 32.

  (2) In the above-described embodiment, an example in which two rubber members are simultaneously extruded from one extruder is shown. However, even when three or more rubber members are simultaneously extruded from one extruder, Good.

  (3) The rubber member molding method and rubber member molding apparatus of the present invention are particularly useful when two sidewalls are extruded simultaneously.

DESCRIPTION OF SYMBOLS 1 Extruder 2 Measurement area 3 Conveyance area 4 Adjustment area 5 Winding area 21 1st conveyor 22 2nd conveyor 23 1st conveyor scale 24 2nd conveyor scale 31 1st conveyance roller 32 2nd conveyance roller 41 1st adjustment roller 42 Second adjustment roller 50 Winding roller A First rubber member B Second rubber member

Claims (6)

A rubber member molding method for simultaneously extruding a plurality of rubber members having the same cross-sectional shape from one extruder,
Measuring an index value corresponding to the amount of rubber for each rubber member extruded from the extruder; and
And a step of controlling the conveyance speed of each conveyance path for conveying each rubber member after measurement based on the measured index value. A step of presetting an index value corresponding to a target rubber amount as a target value;
The rubber member molding method according to claim 1, wherein the conveyance speed is controlled so that the measured index value approaches the target value.   When the measured index value is lower than the target value, the transport speed is decreased, and when the measured index value is higher than the target value, the transport speed is increased. The rubber member molding method according to claim 2. A step of winding the conveyed plurality of rubber members around one winding roller;
The rubber member molding method according to any one of claims 1 to 3, wherein a winding speed of the winding roller is set to be equal to or lower than a slowest conveying speed among the conveying speeds of a plurality of conveying paths.   A plurality of rollers are arranged between the conveyance path and the winding roller, and a slack is formed between the plurality of rollers on a rubber member conveyed at a conveyance speed faster than the winding speed. The rubber member molding method according to claim 4. A rubber member molding apparatus for simultaneously extruding a plurality of rubber members having the same cross-sectional shape from one extruder,
A measuring instrument that measures an index value corresponding to the amount of rubber for each rubber member extruded from the extruder;
A plurality of conveyance paths for conveying each rubber member, provided on the conveyance downstream side of the measuring instrument;
And a control device that controls the conveyance speed of each conveyance path based on the measured index value.

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