Tire manufacturing method

Abstract

The present invention increases tire formation precision and is a tire manufacturing method, which comprises a step (S1) for forming a green tire (Tn) on the outer surface (S) of a rigid inner ring (1) and a vulcanization step (S2) for vulcanizing the green tire (Tn). The rigid inner ring (1) comprises: an inner ring body (3), which is obtained from multiple segments (4); a core (5), which substantially binds the various segments (4); and an outer diameter-adjustment means (33) for changing the outer diameter (D1) of the core (5) by changing the temperature of the core (5). Moreover, the rigid inner ring (1) performs changes such that by expansion of the outer diameter (D1) of the core (5), the various segments (4) move outward in the radial direction of the tire and gaps (G) between the segments (4) are enlarged, while by reducing the outer diameter (D1) of the core (5), the various segments (4) move inward in the radial direction of the tire and the level differences (R) on the outer surface (S) between adjacent segments (4) increase. The vulcanization step (S2) comprises an adjustment step (S21) for adjusting the outer diameter (D1) of the core (5) using the outer diameter adjustment means (33) so that the gaps (G) and the level differences (R) are within a previously established range.

Description

technical field [0001] The present invention relates to a method for manufacturing a tire which can improve the accuracy of forming the tire. Background technique [0002] In recent years, in order to improve the forming accuracy of a pneumatic tire, a method of manufacturing a tire using a rigid core has been proposed. Such a manufacturing method includes, for example, a step of forming a green tire on the outer surface of the rigid core and a vulcanization step of vulcanizing the green tire on the rigid core. [0003] The rigid core is configured to include a core body and a core. The core body consists of a plurality of segments. The core body is formed into an annular shape with a central hole by assembling a plurality of segments. Each segment is substantially restrained by arranging the core in the center hole of the core body. Therefore, the core body can be held in the annular shape by the core. [0004] The plurality of segments are composed of first segments a...

AI Technical Summary

Problems solved by technology

However, when each segment is pushed outward in the radial direction of the tire due to thermal expansion of the core during vulcanization, the gap between adjacent segments becomes larger.

Such a large gap has the problem of soaking the rubber on the inner surface of the raw tire and easily forming protrusions on the inner surface of the tire.

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