JP2005335244A - Method and apparatus for molding annular member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for molding an annular member which is scarcely affected by a die well and can improve the quality of a tire by preventing the contraction, deformation, etc., of the molded annular member and an apparatus for the method. <P>SOLUTION: In the head 1a of an extruder 1, a die constituting member 5 is set on the periphery of an extrusion opening 4. In the die constituting member 5, in order to lead two guide members 7a and 7b set vertically on both sides of the extrusion opening 4 on a die plate 6 and a rubber-like elastic material W extruded from the extrusion opening 4 to the terminal part of one of the guide members 7a and 7b upward, a die head 8 having a prescribed extrusion shape is fixed to an upper terminal part. An extrusion processing part 8a for forming part of the cross-sectional shape of the annular member Q is formed in the die head 8. The bank 11 of the rubber-like elastic material W is constituted of the guide members 7a and 7b, the die head 8, the smooth molding surface 9 of a die auxiliary device 2, and an annular standard member 10 attached to the molding surface 9. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method and apparatus for forming an annular member, and more particularly, for example, a bead grommet used as one of tire constituent materials (a steel cord or the like coated with a rubber material to form an annular shape) Further, the present invention relates to a method and apparatus for forming an annular member that integrally forms an annular member (filler) as a tire component member that is formed with a rubber material and has a substantially triangular cross section.

  Conventionally, a bead used as one of tire constituent materials in a tire molding process is formed in a substantially triangular cross section by a rubber material on an outer peripheral surface of a bead grommet formed in advance by coating a plurality of wires with rubber. It is configured by pasting the filler. The manufacturing process includes extruding a filler having a substantially triangular cross section by an extruder, etc., and cutting the filler at a length corresponding to the circumference of the annular bead grommet, and the outer periphery of the bead grommet. A filler is affixed on the surface, and joining processing (splicing processing) such as butting of the end portions of the filler is performed (for example, see Patent Document 1).

  However, it is very difficult to uniformly deform and paste the filler rubber along the outer peripheral curved surface of the annular bead grommet, especially in order to extrude the band-shaped rubber material that becomes the filler rubber under high pressure (high pressure state) The shape of the extrudate discharged from the extrusion port when it is released into the atmospheric pressure is easily affected, and the dimensions of the extrudate are likely to vary. The tire quality adversely affects the quality of the tires, particularly the spliced part joining state and weight balance, thereby deteriorating the tire uniformity.

  In addition, since the filler rubber is affixed to the bead grommet while the filler is being crimped, the base portion of the filler is stretched, and this stretch amount is often non-uniform, which adversely affects the tire quality. There was a problem.

  Further, in the joining process of the filler end portion, the filler full length may change due to shrinkage of the filler rubber and it may become difficult to align the joining position, which is an undesirable result in terms of quality and work. In addition, in order to solve the problem due to shrinkage of the filler rubber, a cooling area for cooling the filler is required between the filler extrusion process and the regular cutting process. However, the equipment is large and expensive. There was a problem. Therefore, as a method for solving the above problems, the molded filler is wound around the molding drum in a laid state, and after the terminal joining process is finished, it is developed by a mechanism provided on the drum to raise the filler profile, and the bead is A method of pasting is performed.

However, such a method is effective for solving the above-mentioned problems relating to the extrusion of filler and the regular cutting of filler, but cannot solve the shrinkage of filler. Although a method of forming an annular filler by extruding the filler into a strip shape by injection is also conceivable, there is a problem that the equipment becomes large and expensive.
JP-A-8-118515

  The present invention pays attention to such a conventional problem, and the extruded rubber-like elastic material is seamlessly formed into a predetermined shape by a die constituent member attached to the head and a die auxiliary device constituting a part of the die constituent member. By directly forming the annular member, it is difficult to be affected by the die swell, and it is possible to prevent the shrinkage and deformation of the annular member after molding, and to improve the quality of the tire, and its method The object is to provide an apparatus.

  In order to achieve the above object, the present invention provides a method for forming an annular member in a direction in which a die constituent member attached to a head of an extruder or an injection molding machine and a forming surface of a die auxiliary device are orthogonal to or intersecting each other. The rubber-like elastic material having a reduced viscosity is pushed out from the head to the outer peripheral surface side of the annular reference member provided on the molding surface of the die auxiliary device while rotating the die auxiliary device at a predetermined speed. At the same time, an annular member having a predetermined cross-sectional shape is formed by the die component member and the molding surface of the die auxiliary device, and the annular auxiliary member is rotated at least one turn to form an annular member without a joint at the terminal portion. The gist is to do.

  The extrusion speed of the rubber-like elastic material extruded from the extruder or the injection molding machine is controlled in accordance with the cross-sectional area of the annular member and the rotational speed of the die auxiliary device, and two or more kinds of the rubber-like elastic material are extruded. Thus, it is also possible to integrally form a plurality of laminated annular members.

  The annular reference member is a pre-formed bead grommet or a stepped annular portion, and the member formed integrally in an annular shape by the die component member and the die auxiliary device is a filler having a substantially triangular cross section. .

  In this way, by directly forming a seamless annular member of a predetermined shape with the die constituent member attached to the head and the annular reference member of the die auxiliary device, it is difficult to be affected by the die swell. It is possible to improve the quality of the tire by preventing shrinkage and deformation of the annular member.

  In addition, the annular member molding apparatus of the present invention is provided with a die constituent member attached around the extrusion port of the head of the extruder or injection molding machine, and a molding surface arranged in a direction perpendicular to or intersecting with the die constituent member. And a die assisting device that can approach and separate, and the die assisting device is provided with an annular reference member on a rotatable molding surface.

  The die component member includes a guide member disposed on both sides of an extrusion port of the head, and a die head fixed to one end portion of the guide member and having a predetermined extrusion shape, and the guide The member, the die head and the molding surface of the die auxiliary device constitute a bank of rubber-like elastic material extruded from the extrusion port. Further, the molding surface of the die assisting device is one selected from a disk-shaped molding plate having a flat surface, a cylindrical member having a predetermined profile on the outer peripheral surface, and a frustoconical roller having a predetermined profile on the outer peripheral surface. It is also possible to provide a heating means on the molding surface of the die auxiliary device.

  In this way, a die component having a predetermined extrusion profile is attached around the extrusion port of the head of the extruder or injection molding machine, the die component, a disk-shaped molding plate having a flat surface, and a predetermined outer peripheral surface. With a single die support device selected from a cylindrical member with a profile and a frustoconical roller with a predetermined profile on the outer peripheral surface, a seamless annular member is directly formed, simplifying the equipment. It can be manufactured at a low cost, and a stable annular member can be formed efficiently.

Since the present invention is configured as described above, the following excellent effects can be obtained. (a). A seamless annular member having a predetermined shape is directly formed from an extruded rubber-like elastic material with a die constituent member attached to the head and a die auxiliary device constituting a part of the die constituent member. Thus, the extruded rubber-like elastic material can be processed efficiently without cooling.
(b) It is hardly affected by die swell, and the quality of the tire can be improved by preventing shrinkage and deformation of the annular member after molding.
(c) A die component having a predetermined extrusion profile is mounted around the extrusion port of the head of the extruder or injection molding machine, the die component, a disk-shaped molding plate having a flat surface, and a predetermined outer peripheral surface. With a single die support device selected from a cylindrical member with a profile and a frustoconical roller with a predetermined profile on the outer peripheral surface, a seamless annular member is directly formed, simplifying the equipment. Can be manufactured at low cost.
(d) An annular member having a stable shape can always be formed efficiently.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a front view of a molding apparatus for carrying out the method for molding an annular member according to the present invention. Reference numeral 1 denotes an extruder (in this embodiment, an extruder is shown, but an injection molding machine is also possible). ) 2 denotes a die auxiliary device installed so as to be close to and away from the head 1a of the extruder 1. 2 is a front view of the die assisting device 2, FIG. 3 is a plan view of FIG. 2, and FIG. 4A is a side view of FIG. 2. The die assisting device 2 is in the vicinity of the extruder 1. It is installed on the gantry 3 installed in

  As shown in FIGS. 5 to 8, a die component member 5 is attached to the head 1 a of the extruder 1 around the extrusion port 4 of the head 1 a, and the die component member 5 is disposed on the die plate 6. Two guide members 7a and 7b mounted vertically on both sides of the rubber 4 and one end portion of the guide members 7a and 7b, that is, the rubber-like elastic material W extruded from the extrusion port 4 in this embodiment. A die head 8 having a predetermined extrusion shape is fixed to the upper terminal portion in order to guide the wire upward.

  That is, as shown in FIG. 4B, the die head 8 is formed with an extruded portion 8a for forming a part of the cross-sectional shape of the annular member Q (filler). The bank 11 of rubber-like elastic material W is composed of the guide members 7a and 7b, the die head 8, the smooth molding surface 9 of the die auxiliary device 2, and the annular reference member 10 attached to the molding surface 9. Is configured.

  The two guide members 7a and 7b are preferably formed of a fluororesin or the like so that the rubber-like elastic material W can move smoothly without being in close contact.

  Further, the die auxiliary device 2 installed on the gantry 3 has a support frame 13 mounted on a rail 12 laid on the gantry 3 as shown in FIGS. 1 to 4A and 4B. The support frame 13 is configured to approach and separate from the head 1a of the extruder 1 via a cylinder 14 installed on the gantry 3.

  On the support frame 13, a disk-shaped forming plate 15 that constitutes the smooth forming surface 9 of the die assisting device 2 is installed vertically through a support shaft 16, and the support shaft 16 is mounted on the support frame 13. The bearing 17 is rotatably supported by a bearing 17 and is connected to a drive motor 18 installed on a support frame 13 via a transmission drive mechanism 19 such as a sprocket, chain, pulley, or belt. Accordingly, the disk-shaped forming plate 15 constituting the forming surface 9 is rotationally driven in a predetermined direction at a constant speed via the drive motor 18, the transmission drive mechanism 19, and the support shaft 16.

  Further, as described above, the annular reference member 10 is formed on the smooth side surface of the disk-shaped molding plate 15 constituting the molding surface 9, and in the embodiment of the present invention, FIG. 4 (b), FIG. As shown in FIG. 8, the annular reference member 10 is configured by fitting a bead grommet 21 to a pre-shaped stepped annular portion 20, and a circle having a substantially triangular cross section is formed on the outer peripheral surface of the bead grommet 21. The annular member Q (filler) is integrally formed.

  The annular member Q is not limited to the filler of the tire constituent material, and a side tread or the like can also be formed. In this case, the rubber-like elastic material is directly extruded to the stepped annular portion 20 and formed. To do.

  Further, the molding surface of the die assisting device 2 is not limited to the disk-shaped molding plate 15 as in the above embodiment, but a cylindrical member having a predetermined profile on the outer peripheral surface or a predetermined profile on the outer peripheral surface. It is also possible to use a frustoconical roller or the like with

  Further, in the disk-shaped molding plate 15 constituting the molding surface 9, a temperature controllable heater (not shown) or the like that is not shown in order to keep the temperature of the material whose viscosity is reduced at the time of molding constant and facilitate molding is provided. It is also possible to provide a heating means.

Next, a method for forming the seamless annular member Q will be described.
First, the smooth molding surface 9 of the die auxiliary device 2 is brought into contact with the die constituting member 5 attached to the head 1a of the extruder 1 from the orthogonal direction. In this case, in this embodiment, the die auxiliary device 2 installed on the support frame 13 is moved by the cylinder 14 installed on the gantry 3 and brought into contact with the head 1a side, but the extruder 1 side can be moved. If it is a thing, it is also possible to move the extruder 1 to the die auxiliary | assistance apparatus 2 side, and to contact | abut.

  As shown in FIGS. 6 to 8, the disk-shaped molding plate 15 of the die assisting device 5 is placed in the drive motor 18 in a state where the die constituent member 5 and the molding surface 9 of the die assisting device 2 are in contact with each other in an orthogonal direction. At the same time, the rubber-like elastic material W having a reduced viscosity is extruded from the head 1a of the extruder 1 at a predetermined extrusion speed.

  The rubber-like elastic material W extruded from the head 1a of the extruder 1 includes two guide members 7a and 7b, a die head 8 and a smooth molding surface 9 of the die auxiliary device 2, as shown in FIG. And the rubber-like elastic material W in the bank 11 is guided in the rotation direction of the disc-shaped molding plate 15 while flowing out into the bank 11 constituted by the annular reference member 10 attached to the molding surface 9. An extrudate formed in a substantially triangular cross-section from the extruded portion 8a of the die head 8 is extruded and brought into close contact with the outer peripheral surface side of the annular reference member 10.

  As the disk-shaped forming plate 15 is rotated, an annular member Q having a substantially triangular cross section is sequentially formed on the outer peripheral surface of the annular reference member 10, and the forming plate 15 of the die auxiliary device 5 is formed. When rotating at least one turn, the annular member Q is completed, and further, the annular member Q having no joint at the terminal portion is completed.

  The disk-shaped molding plate 15 is heated to a constant temperature by a heating means (not shown) in order to improve the rubber flow of the rubber-like elastic material W to be extruded. In order to finish the shape, it is necessary to arbitrarily set the extrusion speed of the rubber-like elastic material W by the extruder 1 and the rotation speed of the molding plate 15.

  After the annular member Q is completed in this way, the extrusion of the rubber-like elastic material W by the extruder 1 is temporarily stopped, and the completed annular member Q is removed from the smooth molding surface 9 of the die auxiliary device 2. The same operation is repeated again.

  In addition, when manufacturing a bead ring as the annular member Q, as described above, the annular reference member 10 is configured by fitting a bead grommet 21 to a pre-formed stepped annular portion 20. An annular member Q (filler) having a substantially triangular cross section is integrally formed on the outer peripheral surface of the bead grommet 21.

  When manufacturing the annular member Q such as a side tread, the annular member Q is directly manufactured by extruding the rubber-like elastic material W to the stepped annular portion 20 of the annular reference member 10. In the above-described embodiment, the case where the annular member Q is manufactured by extruding one type of rubber-like elastic material W has been described. However, two or more types of rubber-like elastic material W are extruded to laminate a plurality of layers. It is also possible to form the annular member integrally.

  As described above, in the embodiment of the present invention, a seamless annular member Q having a predetermined shape is directly formed by the die constituent member 5 attached to the head 1a and the annular reference member 10 of the die auxiliary device 2. The extruded rubber-like elastic material W is processed without cooling and is hardly affected by the die swell, and the quality of the tire can be improved by preventing shrinkage and deformation of the annular member Q after molding. Is.

It is a front view of the shaping | molding apparatus for enforcing the shaping | molding method of the annular member of this invention. It is a front view of a dice auxiliary device. FIG. 3 is a plan view of FIG. 2. (A) is a side view of FIG. 2, (b) is a perspective view of the completed annular member. It is an expansion perspective view of a die head. It is an enlarged plan view of the forming part of the die head and the die auxiliary device. FIG. 7 is a front view of FIG. 6. FIG. 8 is a side view of FIG. 7.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Extruder 1a Head 2 Dice auxiliary | assistance apparatus 3 Base 4 Extrusion port 5 Die component 6 Die plate 7a, 7b Guide member 8 Die head 8a Extrusion part 9 Molding surface 10 Toroidal reference member 11 Bank 12 Rail 13 Support frame 14 Cylinder DESCRIPTION OF SYMBOLS 15 Molding plate 16 Support shaft 17 Bearing 18 Drive motor 19 Transmission drive mechanism 20 Stepped annular part 21 Bead grommet W Rubber-like elastic material Q Annular member

Claims (8)

The die component attached to the head of the extruder or the injection molding machine and the molding surface of the die auxiliary device are brought into contact with each other in an orthogonal or intersecting direction, and the die auxiliary device is rotated from the head while rotating at a predetermined speed. The rubber-like elastic material having reduced viscosity is extruded to the outer peripheral surface side of the annular reference member provided on the molding surface of the die auxiliary device, and the die component member and the molding surface of the die auxiliary device have a predetermined cross-sectional shape. An annular member forming method in which an annular member is formed, and the die auxiliary device is rotated at least one turn to form a seamless annular member at a terminal portion. The method for molding an annular member according to claim 1, wherein an extrusion speed of a rubber-like elastic material extruded from an extruder or an injection molding machine is controlled in accordance with a cross-sectional area of the annular member and a rotational speed of a die auxiliary device. . The method for forming an annular member according to claim 1 or 2, wherein two or more kinds of the rubber-like elastic material are extruded to integrally form an annular member having a plurality of layers. 2. The annular reference member is a pre-formed bead grommet or a stepped annular portion, and the member integrally formed in an annular shape by a die component member and a die auxiliary device is a filler having a substantially triangular cross section. , 2 or 3 for forming an annular member. A die component attached around the extrusion port of the head of the extruder or the injection molding machine, and a die auxiliary device that is disposed on the molding surface in a direction perpendicular to or intersecting with the die component, and is capable of approaching and separating. The die auxiliary device is an annular member forming device in which an annular reference member is provided on a rotatable forming surface. The die component member includes a guide member disposed on both sides of an extrusion port of the head, and a die head fixed to one end portion of the guide member and having a predetermined extrusion shape, and the guide The annular member forming apparatus according to claim 5, wherein the member and the forming surface of the die head and the die auxiliary device constitute a bank of rubber-like elastic material extruded from the extrusion port. The molding surface of the die assisting device is one selected from a disk-shaped molding plate having a flat surface, a cylindrical member having a predetermined profile on the outer peripheral surface, and a frustoconical roller having a predetermined profile on the outer peripheral surface. The device for forming an annular member according to claim 5 or 6 to be used. The annular member forming apparatus according to claim 5, wherein a heating means is provided on a forming surface of the die auxiliary device.

Images