JP2015013403A - Molding device and molding method of bead filler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding device and a molding method of bead filler in which adjustment work needed upon exchanging the size of a bead core member or a bead filler member can be reduced, formation of a bead filler member with lower height and narrower width can be made possible, and increasing of thickness at a joint part of a bead filler member arranged on the outer periphery surface of the bead core member can be suppressed as small.SOLUTION: In a molding device of a bead filler of the present invention, a molding disc 6 is arranged as fixed as rotatable around the surrounding the central axis line of a bead core member 50 together with a bead holding part 1 at the side surface of the bead holding part 1, a mouth piece 4 which is arranged close to the molding disc 6, partitions, with the molding disc 6 and the outer peripheral surface of the bead core member 50, a space S corresponding to the cross sectional shape of the bead filler member and discharges filler rubber extruded from an extruder 2 to the space S is provided.

Description

  The present invention comprises a bead holding portion for holding an annular bead core member and an extruder for extruding filler rubber for forming a bead filler member, and the outer peripheral surface of the bead core member held by the bead holding portion. The present invention relates to a bead filler molding apparatus and a molding method for forming a bead filler member.

In the green tire molding process, a carcass ply member that also has a cylindrical shape is disposed on the outer peripheral side of the inner liner member formed in a cylindrical shape on the molding drum, and both end portions in the width direction of the carcass ply member After arranging each of a pair of annular bead core members in which bead filler members are arranged on the outer peripheral side in advance on each outer peripheral side of each of the two, each of the both end portions of the carcass ply member is folded around each bead core member. In general, a green case is molded.
The green case is then used to form a green tire by bulging and deforming the central portion in the width direction toward the belt tread band disposed on the outer peripheral side and pressing the belt case on the belt tread band. The

  Here, conventionally, on the outer peripheral surface of the annular bead core member, a plurality of drive rollers that are arranged side by side in the circumferential direction and wound around the bead core member when forming the bead filler member over the entire circumference thereof, and A tension roller, an extruder for extruding the rubber strip, a die attached to the tip of the extruder to give the extruded rubber strip the required cross-sectional shape, and the outer periphery of the bead core member from the die to the rubber strip A server having a plurality of guide rollers for guiding to the surface, a pressure roller for pressing the rubber strip guided by the server onto the outer peripheral surface of the bead core member, and a rubber disposed on the outer peripheral surface of the bead core member A device comprising a cutter for cutting the strip at the required length was used.

  After winding the rubber strip once around the outer peripheral surface of the bead core member using such an apparatus, the winding start end and the winding end of the rubber strip on the outer peripheral surface of the bead core member are manually connected by the operator. The bead filler member was formed by overlapping and bonding.

  By the way, in the above-described apparatus for forming the bead filler member, when the size of the bead core member or the bead filler member is switched, it is necessary to change the position of the guide roller or the like constituting the server, and other adjustment work. In addition to requiring high skill, there was a problem that productivity decreased.

Further, in this apparatus, when forming a bead filler member having a small height or a small width, the cross-sectional area of the rubber strip guided from the server is reduced, and the position of the tip of the rubber strip and the position of the bead core member are highly accurate. It was difficult to align with.
Moreover, in this apparatus, since the winding start end and the winding end of the rubber strip wound on the outer peripheral surface of the bead core member are overlapped and joined particularly by manual work, the thickness of the bead filler at the joining portion is There was a concern that it would be thicker than the other parts, thereby deteriorating the uniformity of tires manufactured using it.

  The present invention aims to solve such problems of the prior art, the purpose of which is to reduce the adjustment work required when switching the size of the bead core member or bead filler member, A bead filler molding device capable of forming a bead filler member having a reduced height and width, and suppressing an increase in thickness at the joint portion of the bead filler member disposed on the outer peripheral surface of the bead core member, and It is to provide a molding method.

  The bead filler molding apparatus according to the present invention includes a bead holding unit that holds an annular bead core member, and an extruder that extrudes filler rubber for forming the bead filler member, and the bead holding unit holds the bead holding unit. A bead filler member is formed on the outer peripheral surface of the bead core member, and a bead holding portion is attached to a side surface of the bead holding portion with a molding disk that is rotatable around a central axis of the bead core member. A space corresponding to the cross-sectional shape of the bead filler member together with the outer peripheral surface of the forming disk and the bead core member, and the filler rubber is discharged into the space. A base is provided.

  Here, it is preferable that the bead filler member formed on the outer peripheral surface of the bead core member has an outer peripheral side portion having a right-angled triangular cross-sectional shape, and a discharge surface that divides a part of the space of the base. Is parallel to the hypotenuse of the outer peripheral portion of the bead filler member, which is a right triangle.

  Preferably, the forming disk includes a detachable attachment that defines a cross-sectional shape of the bead filler member.

  Preferably, the bead holding portion can be deformed and expanded in the radial direction of the bead core member.

Also, the bead filler molding method of the present invention is such that filler rubber extruded from an extruder is disposed on the outer peripheral surface of an annular bead core member held by a bead holding portion, and the bead filler member is formed on the outer peripheral surface. In forming
While extruding filler rubber from the extruder, the filler rubber is fed toward a die placed close to a molding disk attached to a side surface of the bead holding portion,
With the die, the filler rubber is discharged into a space defined by the molding disk, the outer peripheral surface of the bead core member, and the die, and a desired cross-sectional shape is given to the filler rubber in the space, The molding disk is rotated together with the bead holding portion to form the bead filler member over the entire outer circumference of the bead core member.

  According to the bead filler molding apparatus of the present invention, the space adjacent to the molding disk is disposed, and the space corresponding to the cross-sectional shape of the bead filler member is defined along with the molding disk and the outer peripheral surface of the bead core member, and By providing a base for discharging filler rubber in the space, the switching of the size of the bead core member or the bead filler member can be handled only by adjusting the bead holding portion and changing the machine parameters. Adjustment work required at the time of switching can be reduced. The machine parameters include the rotational speed of the forming disk, the position in the horizontal biaxial direction and / or the vertical direction with respect to the installation surface of the forming disk, the rotational speed of the screw of the extruder, the rotational speed of the gear pump of the extruder.

  In this apparatus, the base for discharging the filler rubber is arranged close to the molding disk attached to the side surface of the bead holding part, so that the rubber strip is guided from the base to the outer peripheral surface of the bead core member as in the prior art. The filler rubber discharged from the base is provided with the required cross-sectional shape in the space, and the filler rubber is disposed directly on the outer peripheral surface of the bead core member. Therefore, a bead filler member having a small height and width can be formed.

  Moreover, in the present invention, the provision of the above-described base eliminates the work of cutting the rubber strip at a required length and joining the winding start end and the winding end as was done in the prior art. Therefore, an increase in thickness at the joint portion of the bead filler member can be suppressed to a small level.

  Here, when the discharge surface that divides a part of the space of the base is parallel to the hypotenuse of the outer peripheral side portion of the bead filler member that is a right triangle, the outer periphery of the bead core member has a simple configuration. A bead filler member can be formed on the surface.

  Here, when the forming disk includes a detachable attachment that defines the cross-sectional shape of the bead filler member, the cross-sectional shape of the bead filler member can be easily varied.

  Here, when the bead holding portion can be expanded and contracted in the radial direction of the bead core member, it is possible to more easily cope with the size change of the bead core member or the bead filler member.

  In addition, according to the bead filler molding method of the present invention, the adjustment work required when switching the size of the bead core member or the bead filler member can be reduced and the height and width can be reduced as in the molding apparatus described above. The bead filler member can be formed, and the increase in the thickness at the joint portion of the bead filler member disposed on the outer peripheral surface of the bead core member can be suppressed to a small value.

It is a schematic side view which shows one Embodiment of the bead filler shaping | molding apparatus of this invention. It is a front view of the bead holding part which the apparatus shown in FIG. 1 comprises. It is a perspective view of the nozzle | cap | die removed from the apparatus of FIG. The principal part expansion perspective view ((a)) which shows the aspect of the proximity | contact arrangement | positioning to the shaping | molding disk of the nozzle | cap | die which the apparatus of FIG. 1 provides, and sectional drawing ((b) and (c)) along the bb line | wire It is. It is the side view and sectional drawing of the bead core member which arranged the bead filler member which shows the measurement part of the height and width of the bead filler member in an example. It is a graph which shows each measured value of the height of a bead filler member in each measurement location, and width.

Embodiments of the present invention will be described below with reference to the drawings.
In FIG. 1, reference numeral 1 in FIG. 1 indicates, for example, that one or a plurality of rubber-coated cords are wound in the width direction toward the circumferential direction and wound outward in the radial direction to form a quadrangle, hexagon, or the like. An extruder for extruding a filler rubber for forming a bead filler member on the outer peripheral side of the bead core member, showing a bead holding portion for holding an annular bead core member formed in a cross-sectional shape such as a polygon or a circle Indicates.

  Here, in the illustrated embodiment, for example, the bead holding portion 1 arranged in a posture perpendicular to the installation surface is divided in the circumferential direction as shown in the front view in FIG. The segment 1a is composed of a plurality of, for example, six segments 1a on which the bead core members 50 are arranged. Each segment 1a has an arcuate outer periphery that abuts against the inner peripheral surface of the bead core member 50 in a front view shown in FIG. Has a surface.

  When the bead holding part 1 is composed of a plurality of segments 1a as described above, for example, by providing holding part expansion / contraction means 3 for displacing each of the segments 1a in the radial direction under mutual synchronization, The holding part 1 can be expanded and contracted in the radial direction of the bead core member 50. In addition, this holding | maintenance part expansion-contraction means 3 which enables holding | maintenance of the bead core member 50 from which size differs by the bead holding | maintenance part 1 is the circumference | surroundings of the piston which is not shown in figure which brings about the reciprocating motion to the center axis direction of the bead core member 50, for example. Each arm member 3a for hinge-connecting the piston and each segment 1a can be attached.

  Further, although the details of the extruder 2 are not shown here, for example, a hopper for supplying unvulcanized rubber material into the extruder cylinder and a rubber material supplied from the hopper pass through, in FIG. An internal passage that extends in the left-right direction and a screw that is disposed in the internal passage and contributes to kneading and feeding of the rubber material under application of a rotational driving force by a motor or the like.

  Then, at the front end side of the extruder 2, as shown in FIG. 1, the filler rubber extruded from the extruder 2 is discharged toward the outer peripheral surface of the bead core member 50, and is formed by cutting out a metal material or the like. The base 4 to be attached is attached, for example, with a gear pump 5 composed of a pair of gears meshing with each other for realizing quantitative extrusion of filler rubber toward the base 4 side therebetween.

  Here, in this embodiment, as shown in the perspective view of FIG. 3, the front end surface of the block-shaped base 4 extending along the feeding direction (the left-right direction in FIG. 1) of the filler rubber extruded from the extruder 2. , Projecting forward in the feeding direction, a flat projecting surface 4a perpendicular to the feeding direction, positioned adjacent to the flat projecting surface 4a, and inclined with respect to the flat projecting surface 4a, And the discharge surface 4c in which the discharge port 4b of filler rubber exists, and it is located in the back side of the feed direction rather than the said flat protrusion surface 4a, and is substantially parallel to the flat protrusion surface 4a adjacent to the said discharge surface 4c. The rear flat surface 4d is formed.

  Here, in the present invention, a disk-shaped molding disk 6 having an outer diameter larger than that of the bead holding unit 1 is attached to the side surface of the bead holding unit 1 in the above-described manner in a vertical posture with respect to the installation surface. And the nozzle | cap | die 4 attached to the front end side of the extruder 2 is arrange | positioned adjacent to the shaping | molding disk 6 on the outer peripheral side of the bead core member 50 arrange | positioned at the bead holding part 1, as shown in FIG. Here, a motor for rotating the molding disk 6 around the central axis of the annular bead core member 50 together with the bead holding portion 1 is provided with a rotation driving means (not shown).

More specifically, in the illustrated embodiment, the flat projecting surface 4 a of the base 4 having the tip surface shape as described above is brought into contact with the flat surface of the molding disk 6 on the outer peripheral side of the bead core member 50, for example, in mutual contact. The die 4 is molded so as to define the space S surrounded by the outer peripheral surface of the bead core member 50, the surface of the molding disk 6, and the discharge surface 4 c and the rear flat surface 4 d of the die 4. The surface of the disk 6 and the outer peripheral surface of the bead core member 50 are arranged sufficiently close to each other. Further, in this embodiment, a part of the rear flat surface 4d is in contact with and opposed to a part of the side surface of the bead core member 50.
The space S opened on both sides in the circumferential direction of the bead core member 50 is formed on the outer circumferential side of the bead core member 50 as shown in FIG. It has a shape corresponding to the cross-sectional shape of a bead filler member (not shown).

  In forming a bead filler member using such an apparatus, first, under the operation of the screw of the extruder 2 and the gear pump 5, the filler rubber is extruded from the extruder 2 in a fixed amount, for example. Feed toward the base 4 attached to the front end side of the machine 2.

  Next, as shown in FIG. 4B, the filler rubber that has passed through the base 4 disposed close to the molding disk 6 is separated from the base 4 by the surface of the molding disk 6, the outer peripheral surface of the bead core member 50, and the tip of the base 4. Even if it is discharged into the space S partitioned by the surface, the filler rubber is continuously discharged from the base 4 until the entire space S is filled with the filler rubber.

Then, after the filler rubber is filled in the space S, the extruder 2 that can be fixed and arranged with respect to the installation surface, for example, while maintaining the discharge state of the filler rubber into the space S by the die 4. The base 4 and the base 4 are not displaced, and the molding disk 6 is rotated together with the bead holding portion 1 around the central axis of the bead core member 50 at a required speed as indicated by an arrow X in FIG. The space S is moved along the circumferential direction of the bead core member 50 over the entire circumference of the outer peripheral surface thereof.
As described above, when the base 4 is rotated around the bead core member 50 by rotating the molding disk 6 and the bead holding unit 1, the base 4 is at the discharge start position before the molding disk 6 is rotated. The rotation can be stopped before reaching, and in this case, due to the residual pressure for feeding the filler rubber in the extruder 2, the filler rubber is discharged from the outer peripheral side of the bead core member 50. Thus, the filler rubber starts to flow and joins the winding start end and winding end of the filler rubber.

  As a result, in the space S, the filler rubber to which the required cross-sectional shape is given by the surface of the molding disk 6, the outer peripheral surface of the bead core member 50, and the tip surface of the base 4 is all over the outer peripheral surface of the bead core member 50. A bead filler member having a required cross-sectional shape having an annular shape can be formed on the outer peripheral surface of the bead core member 50 by being disposed over the circumference.

In addition, since the cross-sectional shape of the bead filler member used for molding the green case is generally a trapezoid including an outer peripheral portion that is a right triangle, the discharge surface 4c that partitions a part of the space S of the base 4 is used. As shown in FIG. 4 (b), the base 4 can be arranged in a cross section orthogonal to the circumferential direction of the bead filler member and parallel to the hypotenuse of the outer peripheral side portion of such a bead filler member. preferable.
According to this, the inclination corresponding to the oblique side of the inclined side surface and the upright side surface, which are two side surfaces facing the outside in the axial direction, of the outer peripheral side portion of the bead filler member having a right-angled triangular cross-sectional shape The side surface is formed by the discharge surface 4c of the base 4 and the upright side surface of the outer peripheral side portion is formed by the surface of the molding disk 6, and the bead filler member having such a shape is easily formed. can do. In addition, when changing the cross-sectional shape of a bead filler member here, the cross-sectional shape of a bead filler member is simplified because the shaping | molding disk 6 is equipped with the detachable attachment which prescribes | regulates the cross-sectional shape of a bead filler member. It can be various. For example, as shown in FIG. 4C, an attachment for allowing the forming disk 6 to give a required angle to the upright side surface of the outer peripheral side portion over the entire circumference of the region forming the upright side surface of the outer peripheral side portion. 6a can be provided.

  According to such an apparatus, for switching the size of the bead core member 50 or the bead filler member, the bead holding portion 1 is expanded or contracted by, for example, the holding portion expanding / contracting means 3 described above, and the bead core member 50 is used. In order to change the position of the base 4 arranged close to the molding disk 6 on the outer peripheral side of the molding disk 6 with respect to the surface of the molding disk 6, the molding disk 6 and the bead holding part 1 are arranged in the horizontal biaxial direction with respect to the installation surface and / or Since this can be dealt with by displacing in the vertical direction, it is possible to reduce the number of work steps when switching the size. In addition, when changing the cross-sectional shape thru | or dimension of a bead filler, it can replace | exchange for the nozzle | cap | die which has a required discharge surface shape.

  In order to change the relative position of the die 4 with respect to the surface of the molding disk 6 when switching the size, the extruder 2 can be displaced together with the die 4 in the horizontal or vertical direction. However, it is preferable to displace the molding disk 6 and the bead holding portion 1 having a smaller weight.

Here, it is preferable to use a servo motor for each of the rotation drive means and the reciprocation drive means in the horizontal biaxial direction and the vertical direction of the forming disk 6 in order to operate them in synchronization with each other. Preferably, a pressure sensor is attached to the head, screw and / or gear pump of the extruder.
The apparatus described above includes, for example, a bead core member having an inner diameter of 13 inches (330.2 mm) to 19 inches (482.6 mm), optionally 12 inches (304.8 mm) to 24 inches (609.6 mm), and The height along the radial direction can correspond to the size of the bead filler member of 6 mm to 20 mm.

  Further, in this apparatus, the base 4 is disposed close to the molding disk 6, and filler rubber discharged from the base 4 is directly connected to the base 4, the molding disk 6, and the bead core member 50 without using a server or the like. Since the discharge is made in the space S defined by the outer peripheral surface, the center position of the annular bead filler member to be formed and the center position of the bead holding portion 1 can be more reliably and easily aligned. For example, even a bead filler member having a height of less than 7 mm and a small height and width can be formed.

  In addition, in the conventional apparatus, when forming a bead filler member having such a small height and width, the thickness at the joining portion is reduced by the overlap joining of the winding start end and the winding end of the rubber strip that is performed manually. However, in the present invention, as described above, the joining of the winding start end and the winding end of the filler rubber can be performed without overlapping each other. Since it can be performed while leveling on the discharge surface 4c and the like, an increase in thickness at the joint can be effectively suppressed.

  Here, in order to make the side surface of the joint part of the bead filler member formed on the outer peripheral surface of the bead core member 50 smoother, as shown in FIG. In the surface area of the discharge surface 4c from the discharge port 4b to the side edge E located on the rear side in the rotational direction X of the molding disk 6, a recess 4e that is recessed from the discharge surface 4c is provided. preferable. Thereby, the side surface of the joint part of the bead filler member formed on the outer peripheral side of the bead core member 50 under the control of the discharge amount of the filler rubber from the base 4 and the rotation speed of the molding disk 6 is locally It is possible to prevent the tire uniformity from deteriorating without increasing the typical thickness.

  In such an apparatus, as shown in FIG. 1, another molding disk 16 and another bead holding portion 11 can be provided on the back side of the molding disk 6, and in this case, one rotation driving means is provided. Thus, both the molding disks 6 and 16 and the two bead holding portions 1 and 11 can be rotationally driven, so that two bead filler members can be formed in one molding process.

  Using a bead filler molding apparatus as described above, a bead filler member having a height of 6 mm along the radial direction is formed on the outer peripheral side of a bead core member having an inner diameter of 18 inches (457.2 mm) as shown in FIG. When the height of the bead filler member and the width along the axial direction of the bead filler member were measured at eight locations on the circumference of the bead filler member, the results shown in FIGS. 6 (a) and 6 (b) were obtained. The results shown are obtained.

  Here, when forming the bead filler member, the rotational speed of the forming disk and the rotational speed of the gear pump are synchronized with each other. Here, the number of rotations of the forming disk, the number and pressure of the extruder screw, the pressure in the extruder head, and the number of rotations of the gear pump were measured.

  According to this bead filler molding apparatus, from FIG. 6 and the measurement results of the rotational speed of the molding disk, the rotational speed and pressure of the extruder screw, the pressure in the extruder head, and the rotational speed of the gear pump, By synchronizing the rotation speeds of the pumps with each other, the pressure drop in the extruder head can be suppressed. As a result, a bead filler member having a stable cross-sectional shape is formed on the outer peripheral surface of the bead core member. I understood what I could do.

  Moreover, when a bead filler member having a different size within a range of 6 mm to 20 mm in height is formed with this apparatus, the bead filler member of any size has a thickness of 120% or less of the other portion. Therefore, the thickness of the joint can be suppressed as compared with the bead filler member formed by the conventional apparatus, and this apparatus does not require a high skill for the operator in switching the size. The time required for size switching could be shortened.

DESCRIPTION OF SYMBOLS 1,11 Bead holding | maintenance part 1a Segment 2 Extruder 3 Holding | maintenance part expansion-contraction means 3a Arm member 4 Base 4a Flat protrusion surface 4b Discharge port 4c Discharge surface 4d Back flat surface 4e Concave part 5 Gear pump 6,16 Molding disk 6a Attachment E Capsule discharge Side edge of surface S space

Claims (5)

A bead holding portion for holding an annular bead core member and an extruder for extruding filler rubber for forming a bead filler member are provided on the outer peripheral surface of the bead core member held by the bead holding portion. A bead filler molding apparatus for forming a filler member,
On the side surface of the bead holding portion, a molding disk that can be rotated around the central axis of the bead core member together with the bead holding portion is attached and disposed.
Filler that is disposed in the vicinity of the molding disk, defines a space corresponding to the cross-sectional shape of the bead filler member together with the outer peripheral surface of the molding disk and the bead core member, and is extruded from the extruder into the space. A bead filler molding apparatus provided with a base for discharging rubber.   The bead filler member formed on the outer peripheral surface of the bead core member has an outer peripheral side portion having a right cross-sectional shape of a right triangle, and the discharge surface that divides part of the space of the base is used as the bead filler. The bead filler molding device according to claim 1, wherein the bead filler forming device is parallel to a hypotenuse of the outer peripheral side portion of the member that forms a right triangle.   The bead filler molding apparatus according to claim 1, wherein the molding disk includes a detachable attachment that defines a cross-sectional shape of the bead filler member.   The bead filler molding device according to any one of claims 1 to 3, wherein the bead holding portion can be expanded and contracted in a radial direction of the bead core member. When the filler rubber extruded from the extruder is disposed on the outer peripheral surface of the annular bead core member held by the bead holding portion, the bead filler member is formed on the outer peripheral surface.
While extruding filler rubber from the extruder, the filler rubber is fed toward a die placed close to a molding disk attached to a side surface of the bead holding portion,
With the die, the filler rubber is discharged into a space defined by the molding disk, the outer peripheral surface of the bead core member, and the die, and a desired cross-sectional shape is given to the filler rubber in the space, A bead filler molding method for forming the bead filler member over the entire circumference of the outer peripheral surface of the bead core member by rotating the molding disk together with the bead holding portion.

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