KR100593020B1 - Injection Molding Apparatus for Manufacturing Tire Bead Ass'y - Google Patents

Abstract

The present invention is a rotary injection molding for manufacturing a tire bead assembly made with a mold for each step to sequentially perform the operation of manufacturing a bead by coating a rubber on the bead wire and attaching an apex to the bead to manufacture a bead assembly for a tire. Relates to a device.

Rotary injection molding apparatus for manufacturing a tire bead assembly according to the present invention is a bead injection mold 110 and 1 fixed by a fixing jig 10j protruding to the rotary table 100 and the edge of the rotating table of the rotating disk shape. Including a plurality of bead assembly injection lower plate mold 200 formed adjacently spaced apart at regular intervals in the step Apex injection mold 120, the second step Apex injection mold 130 and the rotary table 100. And rotating the rotary table 100 to inject rubber (r) to coat the bead wire (w) to produce the beads (B), and to the hard afax (HA) to the beads (B). It is a device to perform the step of injection and attaching, and the process of ejecting and attaching the soft Apex (SA) to the hard Apex (HA) attached to the bead (B) in sequence.

Description

Rotary Injection Molding Apparatus for Manufacturing Tire Bead Assembly {Injection Molding Apparatus for Manufacturing Tire Bead Ass'y}             

1 is a cross-sectional view of the bead assembly

Figure 2 is a plan view of a rotary injection molding apparatus for manufacturing a tire bead assembly according to the present invention

3 is a plan view of the lower plate mold

4 is a cross-sectional view taken along the line a-a of FIG.

5 is a cross-sectional view taken along the line b-b of FIG.

6 is a cross-sectional view taken along the line e-e of FIG.

**** Description of the major symbols in the drawings ***

100: rotating table

110: bead injection mold 120: hard afax injection mold

130: soft afax injection mold

200: lower mold

w: steel wire r: rubber coating

B: Bead

The present invention is a rotary injection molding for manufacturing a tire bead assembly made with a mold for each step to sequentially perform the operation of manufacturing a bead by coating a rubber on the bead wire and attaching an apex to the bead to manufacture a bead assembly for a tire. Relates to a device.

The present invention relates to a method for producing a bead portion of a tire and to a method for continuously manufacturing a bead portion using a rotary injection molding machine.

Although tires generally used have different conditions for their use, there are tire construction parts that are commonly used for all kinds of tires. In other words, regardless of the size of tires for trucks or buses or tires for general passengers, they all have an assembly site for realizing the performance as a basic tire. This basic tire component is a tread that provides braking and driving force to the ground in contact with the ground, a belt to maximize the function of the tread portion and at the same time increases the durability of the tire, and a skeleton of the tire as a basic tire component. Carcass, which forms the air, the inner liner that maintains the air in the tire, the side wall portion that causes the tire to bend while forming the side of the tire, and the bead portion that functions to prevent the tire from being attached to the rim. Among these parts, the bead part is made through several steps. First, the bead wire, which is the core of the basic bead structure, the wire coating rubber which is located between the wires and covers the wire, and a few strands are coated. The wires are combined to form a bead like a rectangle or a pentagon, and then a triangular apex rubber is attached on it.

Apex rubber has a harder physical property than rubber in other parts of the body, and it buffers severe unevenness due to the difference in stiffness between the bead portion of the Apex steel wire and the sidewall which is made of rubber. Preferably, it has a function of minimizing tire accidents caused by the weighting of fatigue between these two parts.

As shown in FIG. 1, the bead assembly is composed of a steel wire (w) and a bead (B) made of a rubber coating body (R) surrounding the steel wire, and an apex (A) attached to an outer circumferential surface of the bead. . The afax (A) is composed of a hard afax (HA) and a soft afax (SA). In order to manufacture the bead part, the rubber is first coated with a linear steel wire, and then the coated steel wire is rotated to a constant diameter to produce a round bead core by overlapping a few strands, and the apex rubber on the bead core again. I make a bead by attaching. Here, Apex rubber is usually made by extruding rubber in a separate process line during the production of bead cores, which generally requires more complicated equipment and processes.

As described above, the tire bead part manufacturing process according to the related art is mainly composed of three types, and includes a wire coating step, an apex extrusion step, and an afax attachment step. In the apex extrusion process, there are many problems in maintaining the dimension and maintaining the tack of the rubber in the apex attaching process, and the multi-step process requires a large number of people and a long working cycle time.

The present invention was devised to solve the problems of the conventional bead portion, that is, the bead assembly as described above, the object of the present invention is to provide a rotary injection molding apparatus for the injection and attachment process of rubber coating and afax of the bead steel wire It is characterized in that it is achieved by using a sequential continuous process.

Rotary type bead assembly injection apparatus according to the present invention is a rotary rotary table comprising a rotary rotary table and a rotary rotary table comprising a top plate mold of the plurality of bead assembly injection mold and the injection hole for injecting a liquid synthetic rubber to the top plate mold The lower plate mold is coupled to the lower part of each upper plate mold of the rotary table to eject the bead assembly. The lower plate mold is formed adjacent to the rotary table at equal intervals from the upper plate mold. It is characterized by consisting of an injection mold for afax and a mold for soft afax injection.

The rotary injection molding apparatus for manufacturing a tire bead assembly according to the present invention having the configuration as described above will be described in detail with the accompanying drawings. However, the terms or words used in the present specification and claims are regarded as concepts selected by the inventors as the best way to explain the present invention and the meanings consistent with the technical spirit of the present invention in grasping the technical contents of the present invention. It should be properly interpreted as a concept.

2 is a plan view of a rotary injection molding apparatus for manufacturing a tire bead assembly according to the present invention.

Rotary injection molding apparatus for manufacturing a tire bead assembly according to the present invention is for injection of the bead fixed by the fixing jig (10j) protruding to the rotary table 100 and the edge of the rotary table of the rotary disk as shown in FIG. Bottom plate for injection of three bead assemblies formed adjacent to and spaced apart from the mold 110, the first-step apex injection mold 120, the second-step afax injection mold 130 and the turntable 100 at regular intervals. It is configured to include a mold (200).

A mold fixing jig 10j is formed on the rear surface of the upper surface of the work table 10 at regular intervals, and the mold fixing jig 10j has a bead injection mold 110 and a one-step afax. The injection mold 120 and the two-step apex injection mold 130 are fixed and formed vertically and vertically movable, and each mold is formed with a runner into which liquid synthetic rubber is injected.

3 is a plan view of the lower plate mold 200.

4 is a cross-sectional view taken along the line a-a of FIG. 2.

As shown in FIG. 4, the bead injection mold 110 is an upper plate mold with respect to the lower plate mold 200 for injecting the bead assembly. The bead wire is combined with the lower plate mold 200 to form a bead cavity. ) Is coated with rubber (r) to form beads (B).

Therefore, the cavity is formed into a hemispherical groove forming a round circle toward the bottom of the bead injection mold 110 to form a bead cavity together with the lower plate mold 200.

5 is a cross-sectional view taken along the line b-b of FIG. 2.

The first step afax injection mold 120 is placed on the upper plate surface of the lower plate mold 200 of the bead injection mold fixed to the jig of the rotary table 100, as shown in Figure 5 is already injected into the rubber wire The hard afax (HA) is injected and attached to the bead (B) coated. Therefore, in the first step of the afax injection mold 120, a cavity in which a half of the bead B and the groove of the space where the apex is formed is formed on the bottom side thereof, thereby forming the bead B formed in the lower plate mold 200. Hard afax (HA) is molded in the

6 is a cross-sectional view taken along the line e-e of FIG. 2.

As shown in FIG. 5, the two-step apex injection mold 130 includes beads (B) and hard apex already formed on the lower plate mold 200 of the injection mold fixed to the fixing jig of the rotary table 100. Soft apex (SA) is molded and attached to (HA) to complete the bead assembly.

Rotary-type bead assembly injection manufacturing apparatus according to the present invention having the configuration as described above is a bead injection mold for inserting the bead wire (w) in the cavity of the lower plate mold 200 for bead assembly injection in the first step ( 110) is combined to inject a rubber to produce a bead coated with a rubber.

At the end of the first step bead injection manufacturing process, the bead injection mold 110, which is the upper plate mold, is lifted up and separated from the lower plate mold 200 in which the beads are formed, and the work table 100 is rotated to make beads. Is molded and housed in the lower plate mold 200 is moved to the lower side of the hard afax injection mold 120 to perform the second step process, the hard afax injection mold 120 is lowered to bead (B) is bonded on the lower plate mold 200 is accommodated, and the synthetic rubber is injected into the hard afax (HA) is attached to the bead (B).

When the second step process is completed, the hard afax injection mold 120 rises and is separated from the lower plate mold, and the rotary table 100 is rotated so that the soft afax injection mold 130 has the beads and the hard apaque. HA is moved to the upper side of the lower plate mold 200 which is accommodated in a state of being attached to each other, and the soft apex injection mold 130 is lowered to store the beads and the hard apex HA attached to each other. Combining with the lower plate mold 200, the synthetic rubber is injected to attach the soft Apex (SA) to the hard Apex (HA) to be molded.

As described above, the rotary bead assembly injection manufacturing apparatus according to the present invention includes a process of manufacturing a bead B by coating the bead wire w by injecting rubber r while the rotary table 100 is rotated. A process of injecting and attaching hard afax (HA) to the bead (B) and a process of injecting and attaching a soft afax (SA) to the hard afax (HA) attached to the bead (B) A device configured to manufacture a bead assembly.

Rotary type bead assembly injection manufacturing apparatus according to the present invention having the configuration and action as described above is simplified the process compared to the conventional injection molding of the bead assembly for the tire and the quality of the bead assembly is advantageous because the specification of the bead assembly is advantageous The cycle time is excellent due to the simplicity and automation of the process.

Claims (4)

The bead injection mold 110 and the one-step apex injection mold 120 and the two-step a-pac that protrude on the rotating table 100 and the edge of the rotating table rotated by the fixing jig 10j. It is composed of three bead assembly injection lower plate mold 200 formed adjacent to and spaced apart at regular intervals to the injection molding mold 130 and the rotary table 100, while the rotary table 100 is rotated, Injecting the rubber (r) and coating the bead wire (w) to produce the beads (B); and injecting and attaching the hard afax (HA) to the beads (B); Rotary bead assembly injection manufacturing device to sequentially perform the process of injecting and attaching soft afax (SA) to the attached hard afax (HA) According to claim 1, the bead injection mold 110 is a rotary bead assembly injection is formed with a cavity for manufacturing the beads (B) by coating the rubber (r) on the bead wire (w) with the lower plate mold 200 Manufacturing equipment 2. The rotary bead assembly of claim 1, wherein the one-step afax injection mold 120 is configured to form a cavity for injecting and attaching a hard afax HA to the bead B together with the lower plate mold 200. Injection manufacturing device The method of claim 1, wherein the two-step apex injection mold 130 is for injecting and attaching a soft apace (SA) to the bead (B) attached to the hard afax (HA) together with the lower plate mold 200 Rotary bead assembly injection manufacturing device configured to form a cavity.

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