JP2020059190A - Rubber member molding apparatus and rubber member molding method - Google Patents

Abstract

To provide a rubber member molding apparatus and a rubber member molding method capable of setting a depth of a recess provided in a rubber strip within a certain range.SOLUTION: A rubber member molding apparatus 1 is for molding a rubber member G1 by spirally winding a strip-shaped and unvulcanized rubber strip G on a cylindrical drum D. The rubber member molding apparatus 1 includes a recess forming tool 2 for forming a plurality of recesses on an outer surface Gs of the rubber strip G, a transfer tool 3 for transferring the rubber strip G provided with the recess to the drum D, and a measuring tool 4 for measuring a depth of the recess during transportation.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rubber member molding apparatus and a rubber member forming method in which a recess is provided on the outer surface of a rubber strip.

  Patent Document 1 below describes an apparatus for forming a plurality of recesses on the outer surface of a rubber strip. This device includes a transport unit that transports the rubber strip, a roller provided with a protrusion for forming the recess, and a drum that winds the rubber strip. The recess is formed by contacting the rubber strip with the protrusion of the roller.

  The recess functions, for example, as a groove for discharging air between the rubber strips when the rubber strip is wound around the drum. Therefore, the recess is required to have a certain depth.

JP, 2017-202621, A

  Further, when the depth of the recess becomes large, the thickness of the rubber strip at that part becomes small, and for example, there is a risk of breakage during transportation. Therefore, the depth of the recess is required to be within a certain range.

  However, the depth of the recess varies depending on changes in the physical properties of the rubber strip, the degree of wear of the roller, and the like. In the device of Patent Document 1, the depth of the recess is set within a certain range. Was not considered.

  The present invention has been devised in view of the above circumstances, and a main object of the present invention is to provide a rubber member molding apparatus and a rubber member molding method capable of keeping the depth of the recess of the rubber strip within a certain range. I am trying.

  The present invention is a device for forming a rubber member by spirally winding a strip-shaped and unvulcanized rubber strip on a cylindrical drum, and forming a plurality of recesses on the outer surface of the rubber strip. And a conveyer that conveys the rubber strip provided with the concave portion to the drum, and a measuring instrument that measures the depth of the concave portion during the conveyance.

  In the rubber member molding device according to the present invention, it is desirable that the measuring tool includes a non-contact displacement meter.

  It is preferable that the rubber member molding device according to the present invention includes a determination unit that determines whether or not the measured value of the depth of the recess by the measuring tool is within a predetermined reference range.

  In the rubber member molding device according to the present invention, the recess forming tool controls the depth of the recess based on the difference between the measured value and the reference range when the measured value deviates from the reference range. It is desirable to have control means.

  In the rubber member molding device according to the present invention, the recess forming tool includes a roller provided with a protrusion for forming the recess on a cylindrical outer peripheral surface, and a pressing means for pressing the roller against the rubber strip. Preferably, the control means controls at least one of a pressing force of the roller against the rubber strip or a pressing distance of the roller against the rubber strip.

  The present invention is a molding method for forming a rubber member by spirally winding a strip-shaped and unvulcanized rubber strip on a cylindrical drum, and forming a plurality of recesses on the outer surface of the rubber strip. And a conveying step of conveying the rubber strip provided with the concave portion to the drum, and a measuring step of measuring the depth of the concave portion of the rubber strip during the conveying.

  The apparatus of the present invention includes a measuring tool for measuring the depth of the recess of the rubber strip during transportation. Thereby, for example, by adjusting the recess forming tool that forms the recess based on the measurement result of the measuring tool, the depth of the recess can be kept within a certain range.

It is a side view which shows notionally the rubber member molding apparatus of one Embodiment of this invention. It is an expanded perspective view of the rubber strip provided with the recessed part. It is an enlarged view of the recessed part formation tool of FIG.

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a side view conceptually showing a rubber member molding apparatus 1 (hereinafter, may be simply referred to as “molding apparatus 1”) of one embodiment of the present invention. In the present embodiment, a molding apparatus 1 for molding a rubber member G1 that is a tire constituent member such as a tread rubber or a sidewall rubber is shown as a preferable mode. However, the rubber member G1 molded by the molding device 1 of the present invention is not limited to the tire constituent member.

  As shown in FIG. 1, the molding apparatus 1 of the present embodiment includes a recess forming tool 2, a carrying tool 3, a measuring tool 4, and a drum D. Moreover, the molding apparatus 1 further includes a rubber extruder 5 and a winding tool 6 in the present embodiment.

  The rubber extruder 5 can continuously extrude, for example, an unvulcanized strip-shaped rubber strip G and supply it to the downstream side.

  The carrying tool 3 of the present embodiment carries the rubber strip G along its longitudinal direction. The carrier 3 is arranged, for example, on the downstream side of the rubber extruder 5. In the present embodiment, the transport tool 3 includes a transport belt 8 that is guided by a plurality of guide rollers 7 so as to be capable of rotating. The rubber strip G is held, for example, on the outer surface of the conveyor belt 8 by utilizing the adhesive force of rubber, and is conveyed to the downstream side.

  The recess forming tool 2 of the present embodiment can form a plurality of recesses 10 (shown in FIG. 2) on the outer surface Gs of the rubber strip G. The recess 10 functions as a groove that effectively discharges air between the rubber strips G and G when the rubber strip G is wound, for example, and can prevent air from remaining inside.

  FIG. 2 shows a perspective view of the rubber strip G provided with the recess 10. As shown in FIG. 2, the rubber strip G has a flat cross section and extends in a strip shape. The rubber strip G has a width w1 of about 5.0 to 50.0 mm and a thickness t1 of about 0.5 to 4.0 mm, for example. The rubber strip G is not limited to such dimensions.

   The depth d1 of the recess 10 is smaller than the thickness t1 of the rubber strip G, for example. That is, the recess 10 of the present embodiment does not penetrate the rubber strip G.

  A plurality of recesses 10 are provided at intervals in the longitudinal direction of the rubber strip G. The recess 10 of the present embodiment has a groove shape extending in the width direction of the rubber strip G. The concave portion 10 may extend obliquely with respect to the width direction, for example.

  The depth d1 of the recess 10 is preferably 0.3 to 0.5 times the thickness t1 of the rubber strip G, for example. If the depth d1 of the recess 10 is less than 0.3 times the thickness t1 of the rubber strip G, air may not be effectively discharged. When the depth d1 of the recess 10 exceeds 0.5 times the thickness t1 of the rubber strip G, the rigidity of the rubber strip G is reduced, and for example, there is a possibility that the rubber strip G may be broken by a tensile force when the rubber strip G is wound around the drum D. .

  FIG. 3 is an enlarged view of the vicinity of the recess forming tool 2. As shown in FIG. 3, the recess forming tool 2 of the present embodiment is provided on top of the transport tool 3. In the present embodiment, the recess forming tool 2 includes a roller 13 and a pressing means 14 for pressing the roller 13 against the rubber strip G.

  The roller 13 has, for example, a cylindrical outer peripheral surface 18. In the present embodiment, the circumferential direction of the outer peripheral surface 18 is aligned with the longitudinal direction of the rubber strip G. The central axis 13a of the roller 13 is orthogonal to the longitudinal direction of the rubber strip G.

  A plurality of protrusions 19 for forming the recess 10 are provided on the outer peripheral surface 18 at intervals. Each protrusion 19 extends, for example, along the central axis 13a of the roller 13. The protrusion 19 may be tilted with respect to the central axis 13a, for example. The roller 13 may have a mode in which the rotational force about the central axis 13a is applied by a rotational force application tool (not shown) including an electric motor, for example.

  In the present embodiment, the pressing means 14 includes a roller holding portion 20 that holds the roller 13, and a moving tool 21 that moves the roller holding portion 20 in the vertical direction.

  The roller holding unit 20 of the present embodiment supports a main body 22 provided on the upper part of the roller 13, a support frame 23 attached to the main body 22 and extending downward from the main body 22, and the roller 13 rotatably. And a support shaft 24. The support shaft 24 is supported by the support frame 23. The support shaft 24 supports the roller 13 via, for example, a bearing (not shown).

  The moving tool 21 of the present embodiment includes a slide mechanism 25 and an actuator 26. The slide mechanism 25 supports the roller holding unit 20 so as to be vertically movable. The slide mechanism 25 has a well-known structure including, for example, a guide rail 25a extending in the vertical direction and a slide portion 25b such as a bearing attached to the main body 22 and guided by the guide rail 25a. In this embodiment, the actuator 26 can move the main body 22 supported by the slide mechanism 25 up and down. The actuator 26 preferably has a well-known structure such as an electric cylinder including a rod, an air cylinder, or a ball screw. The moving tool 21 can move the roller 13 held by the roller holding portion 20 to a position where the roller 13 contacts the rubber strip G being conveyed, and press the roller 13 against the rubber strip G. As described above, the moving tool 21 can adjust the pressing distance of the roller 13 to the rubber strip G and the pressing force to the rubber strip G by controlling the actuator 26, for example.

  As shown in FIG. 1, in the present embodiment, the winding tool 6 is capable of spirally winding a rubber strip G provided with a recess 10 on a cylindrical drum D. As a result, the rubber strip G is formed as the rubber member G1. The winding tool 6 is provided, for example, on the downstream side of the recess forming tool 2 and the transport tool 3.

  In the present embodiment, the winding tool 6 includes an applicator 6A that supplies the rubber strip G to the drum D, and a sticking roller 6B that sticks the rubber strip G to the drum D.

  The applicator 6A is a transport conveyor in this embodiment. In this embodiment, the applicator 6A includes a lower conveyor unit 28 and an upper guide roller 29. The lower conveyor unit 28 has, for example, a conveyor belt 28A that can rotate around an upward surface as a conveyor surface. The upper guide roller 29, for example, sandwiches the rubber strip G together with the conveyor belt 28A and suppresses the displacement thereof.

  In this embodiment, the sticking roller 6B sticks the rubber strip G on the outer peripheral surface of the drum D. The sticking roller 6B is rotatably supported by, for example, a roller holder. The sticking roller 6B is connected to, for example, an actuator 30 having a well-known structure. The actuator 30 presses the rubber strip G against the outer peripheral surface of the drum D via the sticking roller 6B. As a result, a pressing force is applied to the rubber strip G. As such an actuator 30, for example, a pneumatic cylinder or an electric cylinder having a well-known rod is suitable.

  The measuring tool 4 of the present embodiment measures the depth d1 of the recess 10 of the rubber strip G being conveyed. In the present embodiment, the measuring tool 4 can output an electric signal corresponding to the measured value k of the measured depth d1 of the recess 10.

  In the present embodiment, the measuring tool 4 is arranged downstream of the recess forming tool 2 and above the transport tool 3. The measuring tool 4 is, for example, a non-contact type displacement meter 4A. The displacement meter 4A is preferably, for example, a laser displacement meter that detects the depth d1 and the displacement amount of the recess 10 by irradiating the recess 10 with laser light and detecting the reflected light. As the laser displacement meter, for example, the LK series manufactured by Keyence Corporation is suitable.

  In the present embodiment, the recess forming tool 2 further includes a control unit 15 that controls the depth d1 of the recess 10.

  In the present embodiment, the control unit 15 includes a determination unit 15a that determines whether the measured value k of the depth d1 measured by the measuring tool 4 is within a predetermined reference range s. Then, for example, when the determination unit 15a determines that the measurement value k is out of the reference range s, the control unit 15 determines the depth d1 of the recess 10 based on the difference between the measurement value k and the reference range s. To control.

  The reference range s is preferably a narrower range included in the constant range s1 that is the target value (design value) of the depth d1, for example. As a result, the depth of the recess 10 can be more accurately set to the constant range s1. The reference range s may be a fixed range s1 that is the target value.

  In the present embodiment, the control means 15 receives an electric signal corresponding to the measurement value k of the depth d1 output from the measuring tool 4. Then, the determination unit 15a of the control unit 15 makes a determination by comparing the reference range s input in advance in the control unit 15 with the measured value k. When the determination unit 15a determines that the measurement value k is out of the reference range s, the control unit 15 outputs the electric signal P1 based on the difference between the measurement value k and the reference range s, for example, the recess forming tool. It outputs to the actuator 26 of No. 2 or the actuator 30 connected to the sticking roller 6B. In the present embodiment, the actuator 26 controls at least one of the pressing force of the roller 13 or the pressing distance of the roller 13 to the rubber strip G based on the electric signal P1 input from the control means 15. The actuator 30 adjusts the pressing force of the sticking roller 6B based on the electric signal P1, for example, so that the depth d1 of the recess 10 of the rubber strip G wound around the drum D is set to a constant range s1. To control.

  For example, when it is determined that the measured value k is smaller (shallow) than the reference range s, the control unit 15 controls the pressing force of the roller 13, the pressing distance of the roller 13 to the rubber strip G, or the pressing of the sticking roller 6B. At least one of the pressures is controlled to be large. On the contrary, when the measured value k is determined to be larger (deeper) than the reference range s, the control unit 15 causes the pressing force of the roller 13, the pressing distance of the roller 13 to the rubber strip G, or the sticking roller 6B. At least one of the pressing forces is controlled to be small. As a result, the depth d1 of the recess 10 of the rubber strip G can be set within the fixed range s1.

  When the determination means 15a determines that the measured value k is slightly out of the reference range s, the control means 15 outputs, for example, the electric signal P1 only to the actuator 26 to control only the pressing force of the roller 13. Then, the depth d1 of the recess 10 of the rubber strip G is set to a constant range s1. When the determination unit 15a determines that the measured value k is largely outside the reference range s, the control unit 15 outputs the electric signal P1 to the actuator 26 and the actuator 30 to push the roller 13. Even if the depth d1 of the concave portion 10 of the rubber strip G is set to a constant range s1 by controlling either one of the pressure, the pressing distance of the roller 13 to the rubber strip G, or the pressing force of the sticking roller 6B. good. Further, when the determination means 15a determines that the measured value k is further out of the reference range s, the control means 15 outputs, for example, the electric signal P1 to the actuator 26 and the actuator 30, and the controller 13 outputs the electric signal P1. The depth d1 of the concave portion 10 of the rubber strip G may be set to a constant range s1 by controlling all the pressing force, the pressing distance of the roller 13 to the rubber strip G, and the pressing force of the sticking roller 6B.

  Although not particularly limited, it is desirable that the pressing force of the roller 13 and the pressing force of the sticking roller 6B can be controlled at a pitch of 0.1 kPa. Further, it is desirable that the pressing distance of the roller 13 against the rubber strip G can be controlled at a pitch of 0.01 mm.

  Even if the determination means 15a determines that the measured value k of the depth d1 is within the reference range s, the control means 15 recesses the electric signal P2 based on the difference between the reference range s and the measured value k, for example. It is desirable to output to the actuator 26 of the forming tool 2. In this case, the actuator 26 of the recess forming tool 2 applies at least one of the pressing force or the pressing distance so as to maintain the state in which the depth d1 is within the reference range s based on the electric signal P2. Control. Note that the control unit 15 is not limited to such an aspect, and when it is determined that the measured value k of the depth d1 is within the reference range s, the control unit 15 may not output the electric signal P2.

  Such control means 15 includes, for example, an arithmetic unit including a CPU (central processing unit), a storage unit in which control procedures and programs are stored in advance, and a work memory from which the control procedures are read. Well-known control devices are preferably used. In the present embodiment, the calculation unit of the control unit 15 functions as the determination unit 15a that determines whether the measured value k is within the reference range s. As the control device, for example, a programmable sequencer, a microcomputer, a personal computer or the like is desirable.

  Next, a rubber member molding method using the molding device 1 of the present embodiment will be described. First, an extrusion step of continuously extruding the rubber strip G from the rubber extruder 5 is performed. In the extrusion process, the rotation speed of the screw shaft is controlled to be constant by, for example, a motor (not shown).

  Next, a carrying step of carrying the rubber strip G is performed. In the carrying step of the present embodiment, the carrying tool 3 carries the rubber strip G to the drum D side.

  Next, a recess forming step of forming a plurality of recesses 10 on the outer surface Gs of the rubber strip G is performed. In the recess forming step of the present embodiment, the recess 10 is formed in the rubber strip G being conveyed by the conveyor 3. When the rubber strip G is conveyed to a predetermined position, the actuator 26 of the recess forming tool 2 is actuated to lower the roller 13 to a position where the roller 13 contacts the rubber strip G, and the recess 10 is formed on the outer surface Gs. . The pressing force of the roller 13 against the rubber strip G and the pressing distance of the roller 13 against the rubber strip G are controlled by the control means 15.

  Next, a measurement step of measuring the depth d1 of the recess 10 of the rubber strip G being conveyed is performed. In the measuring step of this embodiment, the depth d1 is measured by the measuring tool 4. In the present embodiment, when the depth d1 is measured, the electric core signal based on the measured value k is output to the control means 15.

  The control means 15 determines whether the measured value k is within a predetermined reference range s based on the electric signal. When it is determined that the deviation is out of the reference range s, the control unit 15 controls at least one of the pressing force of the roller 13 against the rubber strip G or the pressing distance of the roller 13 against the rubber strip G, for example. desirable. In this embodiment, the control means 15 outputs an electric signal P1 based on the difference between the measured value k and the reference range s to the actuator 26 of the recess forming tool 2. The actuator 26 controls at least one of the pressing force of the roller 13 against the rubber strip G and the pressing distance of the roller 13 against the rubber strip G in response to the electric signal P1. As a result, the depth d1 of the recess 10 can be set within the fixed range s1.

  Further, even when the measured value k is determined to be within the reference range s, the control unit 15 determines, for example, the pressing force of the roller 13 against the rubber strip G or the pressing distance of the roller 13 against the rubber strip G. It is desirable to control at least one. As a result, it is possible to make the range even more constant.

  Next, a sticking step of stacking the rubber strip G on the drum D and sticking the rubber member G1 is performed. In the pasting step, in the present embodiment, the applicator 6A of the winding tool 6 conveys the rubber strip G to the outer peripheral surface of the drum D, and the pasting roller 6B presses the rubber strip G against the outer circumferential surface of the drum D. It can be pasted. At this time, the pressing force by the actuator 30 connected to the sticking roller 6B is controlled on the basis of the difference between the measured value k and the reference range s determined by the determination means 15a, and the depth d1 is kept in the constant range s1. Can be within.

  Above, a particularly preferred embodiment of the present invention has been described in detail, but the present invention is not limited to the illustrated embodiment and can be carried out by being modified into various aspects.

1 Rubber Member Molding Device 2 Recess Forming Tool 3 Conveying Section 4 Measuring Tool 10 Recess d1 Recess Depth D Drum G Rubber Strip Gs Outer Surface G1 Rubber Member

Claims (6)

An apparatus for forming a rubber member by spirally winding a strip-shaped and unvulcanized rubber strip on a cylindrical drum,
A recess forming tool for forming a plurality of recesses on the outer surface of the rubber strip,
A conveyer that conveys the rubber strip provided with the recess to the drum,
During the transportation, including a measuring tool for measuring the depth of the recess,
Rubber member molding equipment.   The rubber member molding device according to claim 1, wherein the measuring tool includes a non-contact displacement meter.   The rubber member molding apparatus according to claim 1 or 2, further comprising: a determination unit that determines whether or not a measured value of the depth of the recessed portion by the measuring tool is within a predetermined reference range.   4. The recess forming tool according to claim 3, further comprising control means for controlling the depth of the recess based on a difference between the measured value and the reference range when the measured value deviates from the reference range. Rubber member molding equipment. The recess forming tool includes a roller having a cylindrical outer peripheral surface provided with a protrusion for forming the recess, pressing means for pressing the roller against the rubber strip, and sticking the rubber strip on the drum. Including a sticking roller for, and the control means,
5. The control means controls at least one of a pressing force of the roller on the rubber strip, a pressing distance of the roller on the rubber strip, or a pressing force of a sticking roller on the rubber strip. The rubber member molding device described. A belt-shaped and unvulcanized rubber strip, a molding method for spirally winding a cylindrical drum to form a rubber member,
A recess forming step of forming a plurality of recesses on the outer surface of the rubber strip,
A conveying step of conveying the rubber strip provided with the recess to the drum,
A measuring step of measuring the depth of the recess of the rubber strip during the conveyance,
Rubber member molding method.

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