JP2017109419A - Manufacturing device and manufacturing method of cylindrical rubber member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing device and a manufacturing method of a cylindrical rubber member which can stabilize a dimension early while whole equipment is compact.SOLUTION: A manufacturing device 1 of a cylindrical rubber member 9 can stabilize a dimension after a rubber is molded in a cylindrical shape. The manufacturing device includes a molding drum 11 in which the rubber is wound around a molding surface 11a to mold the cylindrical rubber member 9, a plurality of rotary rollers 12 arranged along a circumference direction in an inside of the molding drum 11, a roller moving device 13 for moving the rotary rollers 12 in a diameter direction of the molding drum 11, and a control part for controlling the molding drum 11, the rotary rollers 12, and the roller moving device 13. The control part expands the cylindrical rubber member 9 while rotating in the circumference direction by moving to an outer side of the diameter direction than a molding surface 11a of the molding drum 11 while rotating the plurality of rotary rollers 12 in a same direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a manufacturing apparatus and a manufacturing method of a cylindrical rubber member that stabilizes dimensions after molding rubber into a cylindrical shape.

  Thin rubber members such as inner liners of pneumatic tires are difficult to form due to the high internal pressure of the mold, in addition to the difficulty of uniformizing the rubber flow rate by extrusion with an extruder. Often molded by. However, molding with a calender roll makes it difficult to relieve internal stress, so it takes a lot of time and man-hours to stabilize the dimensions.

  In the following Patent Document 1, the rubber sheet is provided on the downstream side in the moving direction of the rubber sheet from the calender device that forms the rubber sheet by rolling the unvulcanized rubber, and in the rubber sheet width direction orthogonal to the moving direction of the rubber sheet, A rubber sheet molding apparatus is described that includes an expansion device that expands the width dimension of the rubber sheet to 110% or more of the original dimension. According to this molding apparatus, the internal stress for contraction in the moving direction of the rubber sheet is relieved by expanding the width of the rubber sheet to 110% or more of the original dimension by the stretching device. Shrinkage can be terminated early and easily, and thus the shrinkage of the rubber sheet can be improved.

  Patent Document 2 listed below is a method for stabilizing the size of a rubber sheet in a rubber rolling device that cools until the size of the rubber sheet formed by a calender roll becomes stable, and when the rubber sheet is cooled, A rubber sheet dimensional stabilization method is described in which the rubber sheet is cooled while being pressed at a predetermined pressure with respect to the entire width of the rubber sheet to accelerate the dimensional stability of the rubber sheet. According to this dimension stabilizing method, when the rubber sheet is cooled, the rubber sheet is cooled while being pressed against the entire width of the rubber sheet with a predetermined pressure, so that the unvulcanized rubber sheet rolled by a calendar roll is used. Can be restrained to suppress the shrinkage, and the dimensions of the rubber sheet can be brought to a stable state at an early stage.

  The following Patent Document 3 is characterized in that a rubber sheet obtained by rolling unvulcanized rubber with a calender roll is molded, and dimensional stabilization of the rubber sheet is promoted by heating the entire surface of the rubber sheet over the entire width. A rubber sheet molding method is described.

  According to the apparatus or method described in Patent Documents 1 to 3, the amount of dimensional change due to shrinkage can be suppressed, but a device for extending, pressing, and heating the rubber sheet is provided on the downstream side of the calendar apparatus in the moving direction of the rubber sheet. The installation area of the entire equipment tends to increase.

JP 2011-126099 A JP-A-5-245864 JP 2002-283376 A

  Therefore, an object of the present invention is to provide a manufacturing apparatus and a manufacturing method of a cylindrical rubber member that can stabilize dimensions at an early stage while the entire facility is compact.

The above object can be achieved by the present invention as described below.
That is, the cylindrical rubber member manufacturing apparatus of the present invention is a cylindrical rubber member manufacturing apparatus that stabilizes dimensions after molding rubber into a cylindrical shape,
A molding drum in which rubber is wound around a molding surface to mold a cylindrical rubber member;
A plurality of rotating rollers arranged along the circumferential direction inside the molding drum;
A roller moving device for moving the rotating roller in the radial direction of the forming drum;
A control unit for controlling the forming drum, the rotating roller, and the roller moving device,
The controller is configured to extend the cylindrical rubber member while rotating it in the circumferential direction by moving the plurality of rotating rollers radially outward from the molding surface of the molding drum while rotating the plurality of rotating rollers in the same direction. Features.

  According to the manufacturing apparatus according to this configuration, since the internal stress of the cylindrical rubber member is relaxed by extending the cylindrical rubber member, the dimensions can be stabilized at an early stage. Furthermore, since the cylindrical rubber member is extended while being rotated, the whole can be relaxed uniformly. In addition, since the manufacturing apparatus of the present invention relaxes while rotating the cylindrical rubber member with a plurality of rotating rollers, the entire equipment can be made compact compared to a method of relaxing a rubber sheet rolled with a calender roll as a sheet. .

In the cylindrical rubber member manufacturing apparatus of the present invention, the molding drum is composed of a plurality of segments divided in the circumferential direction,
The control unit preferably extends the cylindrical rubber member by moving the plurality of segments outward in the radial direction.

  According to this configuration, the cylindrical rubber member molded on the molding surface can be extended without being removed from the molding drum.

Further, the method for producing a cylindrical rubber member of the present invention is a method for producing a cylindrical rubber member that stabilizes dimensions after molding rubber into a cylindrical shape,
The cylindrical rubber member is moved radially outward of the cylindrical rubber member while rotating a plurality of rotating rollers arranged along the circumferential direction inside the cylindrical rubber member in the same direction. A step of stretching while rotating in the circumferential direction is provided.

  According to the manufacturing method according to this configuration, by extending the cylindrical rubber member, the internal stress of the cylindrical rubber member is relieved, so that the dimensions can be stabilized at an early stage. Furthermore, since the cylindrical rubber member is extended while being rotated, the whole can be relaxed uniformly. In addition, since the manufacturing method of the present invention relaxes while rotating the cylindrical rubber member with a plurality of rotating rollers, the entire facility can be made compact compared to the method of relaxing the rubber sheet rolled with a calender roll in the form of a sheet. .

In the method for producing a cylindrical rubber member according to the present invention, the method further comprises a step of forming the cylindrical rubber member by winding rubber around a molding surface of a cylindrical molding drum,
The plurality of rotating rollers are preferably moved radially outward from the molding surface of the molding drum.

  According to this configuration, the cylindrical rubber member can be extended by the rotating roller without removing and moving the cylindrical rubber member molded on the molding surface from the molding drum.

In the method for producing a cylindrical rubber member of the present invention, the molding drum is composed of a plurality of segments divided in the circumferential direction,
It is preferable that the method further includes a step of extending the cylindrical rubber member by moving the plurality of segments outward in the radial direction before moving the plurality of rotating rollers.

  According to this configuration, the cylindrical rubber member molded on the molding surface can be extended without being removed from the molding drum.

  In the method for producing a cylindrical rubber member according to the present invention, the rotating roller moves outward in the radial direction through a gap between the adjacent segments generated when the segments are moved outward in the radial direction. It is preferred that

  According to this configuration, the cylindrical rubber member molded on the molding surface can be extended without being removed from the molding drum.

Plan view and front view of cylindrical rubber member manufacturing apparatus Plan view and front view showing the usage state of the manufacturing apparatus Process diagram of manufacturing method of cylindrical rubber member

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The production apparatus and production method of the present invention are intended to stabilize the dimensions of a cylindrical rubber member obtained by molding rubber into a cylindrical shape at an early stage. The cylindrical rubber member whose dimensions are stabilized by the present invention is not particularly limited as long as it is a cylindrical rubber member, but the present invention forms a cylindrical shape by joining the ends of a thin sheet rubber. It is useful for stabilizing the dimensions of the rubber member, and is particularly useful for stabilizing the dimensions of tire constituent members such as an inner liner. The thin sheet rubber is extruded by a known extruder or rolled by a known calender roll.

  FIG. 1 is a plan view and a front view of a cylindrical rubber member manufacturing apparatus 1. FIG. 2 is a plan view and a front view showing the usage state of the manufacturing apparatus 1. In FIG. 2, the cylindrical rubber member 9 is indicated by a two-dot chain line.

  As shown in FIG. 1, the manufacturing apparatus 1 includes a molding drum 11 in which rubber is wound around a molding surface 11 a to mold a cylindrical rubber member 9, and a plurality of drums 11 arranged along the circumferential direction inside the molding drum 11. A rotating roller 12, a roller moving device 13 that moves the rotating roller 12 in the radial direction of the forming drum 11, and a control unit (not shown) that controls the forming drum 11, the rotating roller 12, and the roller moving device 13. I have.

  The forming drum 11 has a cylindrical shape and is composed of a plurality of segments 111 divided in the circumferential direction. In the present embodiment, the segment is composed of twelve segments 111, but is not limited to this. The outer peripheral surface of each segment 111 has an arc shape.

  The segment 111 can be moved toward the inside and outside in the radial direction of the forming drum 11 by the segment moving device 112. Thus, when the cylindrical rubber member 9 is molded on the molding surface 11a, the gap between the adjacent segments 111 can be eliminated as shown in FIG. On the other hand, when the cylindrical rubber member 9 is extended, the segment 111 can be moved outward in the radial direction of the molding drum 11 as shown in FIG. 2 to create a gap between the adjacent segments 111. . Examples of the segment moving device 112 include an air type, a hydraulic cylinder, or a ball screw.

  The plurality of rotating rollers 12 can be driven to rotate. As shown in FIG. 2, when the plurality of rotating rollers 12 rotate in the same direction while being in contact with the inner peripheral surface of the cylindrical rubber member 9, the cylindrical rubber member 9 also rotates. Note that all of the plurality of rotating rollers 12 do not have to be driving rollers, and some of them may include free rollers. The rotating roller 12 is rotated by a rotation driving device such as a motor (not shown).

  The plurality of rotating rollers 12 are arranged along the circumferential direction of the forming drum 11. In the present embodiment, twelve rotating rollers 12 are provided along the circumferential direction of the forming drum 11, and each rotating roller 12 is disposed between adjacent segments 111. Further, the plurality of rotating rollers 12 are arranged along the axial direction of the forming drum 11. In the present embodiment, eight rotating rollers 12 are provided along the axial direction of the forming drum 11. The number of rotating rollers 12 arranged in the circumferential direction and the axial direction of the forming drum 11 is appropriately changed depending on the size of the cylindrical rubber member 9 and the like.

  The roller moving device 13 can move the rotating roller 12 toward the inside and outside in the radial direction of the forming drum 11. Accordingly, the rotating roller 12 can be moved radially inward from the forming surface 11a of the forming drum 11 as shown in FIG. 1, while the rotating roller 12 can be moved from the forming surface 11a of the forming drum 11 as shown in FIG. It can be moved radially outward. Examples of the roller moving device 13 include an air type, a hydraulic cylinder, or a ball screw.

  A control unit (not shown) can control the forming drum 11, the rotating roller 12, and the roller moving device 13. Specifically, the control unit adjusts the rotation speed and rotation timing of the forming drum 11, controls the segment moving device 112 to adjust the movement speed and movement timing of the segment 111, It is possible to adjust the rotation speed and the rotation timing, or to control the roller moving device 13 to adjust the movement speed and the movement timing of the rotation roller 12.

  Next, a method for manufacturing the cylindrical rubber member 9 using the manufacturing apparatus 1 will be described. The manufacturing method of the cylindrical rubber member 9 of the present invention is such that the outer side in the radial direction of the cylindrical rubber member 9 while rotating the plurality of rotating rollers 12 arranged along the circumferential direction inside the cylindrical rubber member 9 in the same direction. And moving the cylindrical rubber member 9 while rotating it in the circumferential direction. Further, the manufacturing method of the present invention may further include a step of forming the cylindrical rubber member 9 by winding rubber around the molding surface 11 a of the cylindrical molding drum 11.

  First, as shown in FIG. 3A, rubber is wound around the molding surface 11 a of the molding drum 11 to mold the cylindrical rubber member 9. The rubber is extruded into a sheet shape by an unillustrated extruder or the like, and the cylindrical rubber member 9 is formed by joining the end portions of the sheet rubber.

  Next, as shown in FIG. 3B, the plurality of segments 111 constituting the forming drum 11 are moved outward in the radial direction. Thereby, the cylindrical rubber member 9 is extended.

  Next, as shown in FIG. 3C, the plurality of rotating rollers 12 are moved radially outward from the molding surface 11a of the molding drum 11 (segment 111). At this time, the plurality of rotating rollers 12 are moved outward in the radial direction through the gaps between the adjacent segments 111 generated by moving the segments 111 outward in the radial direction. Further, when the rotating roller 12 is moved radially outward from the molding surface 11a, the rotating roller 12 is moved while being rotated. Thereby, the cylindrical rubber member 9 can be extended while rotating in the circumferential direction.

  In the manufacturing method of the present invention, the cylindrical rubber member 9 may be extended as shown in FIG. 3C and then held for a predetermined time while the rotating roller 12 is still rotated.

[Other Embodiments]
In the above-described embodiment, an example in which a plurality of rotating rollers 12 are arranged along the axial direction of the forming drum 11 has been described. However, one rotating roller 12 extending in the axial direction of the forming drum 11 may be arranged.

DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus 9 Cylindrical rubber member 11 Molding drum 11a Molding surface 12 Rotating roller 13 Roller moving apparatus 111 Segment 112 Segment moving apparatus

Claims (6)

An apparatus for manufacturing a cylindrical rubber member that stabilizes dimensions after molding rubber into a cylindrical shape,
A molding drum in which rubber is wound around a molding surface to mold a cylindrical rubber member;
A plurality of rotating rollers arranged along the circumferential direction inside the molding drum;
A roller moving device for moving the rotating roller in the radial direction of the forming drum;
A control unit for controlling the forming drum, the rotating roller, and the roller moving device,
The controller is configured to extend the cylindrical rubber member while rotating it in the circumferential direction by moving the plurality of rotating rollers radially outward from the molding surface of the molding drum while rotating the plurality of rotating rollers in the same direction. An apparatus for producing a cylindrical rubber member. The molding drum is composed of a plurality of segments divided in the circumferential direction,
The apparatus for manufacturing a cylindrical rubber member according to claim 1, wherein the control unit extends the cylindrical rubber member by moving the plurality of segments outward in the radial direction. A method of manufacturing a cylindrical rubber member that stabilizes dimensions after molding rubber into a cylindrical shape,
The cylindrical rubber member is moved radially outward of the cylindrical rubber member while rotating a plurality of rotating rollers arranged along the circumferential direction inside the cylindrical rubber member in the same direction. A method for producing a cylindrical rubber member, comprising a step of stretching while rotating in a circumferential direction. Further comprising the step of winding the rubber around the molding surface of the cylindrical molding drum to mold the cylindrical rubber member,
The method for producing a cylindrical rubber member according to claim 3, wherein the plurality of rotating rollers are moved radially outward from a molding surface of the molding drum. The molding drum is composed of a plurality of segments divided in the circumferential direction,
5. The method according to claim 4, further comprising a step of extending the cylindrical rubber member by moving the plurality of segments radially outward before moving the plurality of rotating rollers. 6. A method for producing a cylindrical rubber member. The said rotating roller is moved toward the radial direction outer side through the clearance gap between the said adjacent segments produced when the said segment is moved toward the radial direction outer side. A method for producing a cylindrical rubber member.

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