Pre-bending method for meridian large tyre triangular rubber

Abstract

The invention discloses a method for prebending a bead filler of a giant radial tire in tire manufacture industry. After being compounded with a bead ring, a vertical bead filler is formed with certain radians by a bending unit. The formed bead filler is inclined toward onside of the bead ring. A bead filler forming method is as follows: the compounded bear filler makes a circular motion and the bending unit is arranged on a rotation path of the bead filler; at the same time the bead filler is pre-heated by a heating device and is kept as a certain temperature in order to become soft and facilitate bending; a coiling and binding device with a heating binding mode is preferred as a compounding mechanism of the bead filler and the bead ring; and the bending of the bead filler is carried out synchronously with the binding of the bead filler and the bead ring. The method prebending the bead filler well solves the problem that the bead filler can not be closely bound with a tire easily in the first-stage forming because of the high hardness and thickness of the bead filler and reduces air bubbles in the tire, thereby improving the quality of the giant radical tire.

Description

(1) Technical field: [0001] The invention relates to a production process of tire components, in particular to a pre-bending method of apex rubber for radial giant tires. (two) background technology: [0002] In order to enhance the rigidity of the tire bead, and transition from rigidity to softness, prevent local deformation of the tire, and maintain the basic shape of the tire, existing tires are fixed with a certain height of apex rubber on the outer diameter of the tire bead. The composite height range of the bead ring and the apex rubber of commonly used automobile tires is basically below 100mm, and the composite height is low and the weight is light; Tire development, in this type of tire, the height range of the apex compounded on the bead ring is expanded to 200mm-450mm, and the compound width and weight are increased at the same time. [0003] The existing composite process of bead ring and apex rubber is completed on a composite production line, which is composed...

AI Technical Summary

Problems solved by technology

[0004] In the forming process of the first stage of the giant radial tire, when the apex on the steel traveler is closely attached to the carcass, it is necessary to bend the upright apex to the side of the carcass before it can be closely attached to the carcass. Due to the size of the apex Large, plus the apex at this time has cooled, and its strength and hardness have increased. It is very difficult and non-standard to bend the apex manually or with the help of tools to fit the curvature, resulting in uneven bonding surface. Overwhelming and close to the drum surface, but because the traveler is fixed during molding, the joint strength between the traveler and the apex is not high. When the apex is overwhelmed, the joint will be separated and disengaged, forming a cavity, and air bubbles will be generated under the wrapping of other parts. , seriously affecting the quality of radial giant tires

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