Mold for manufacturing tire and method for manufacturing tire

Abstract

The invention provides a mold for manufacturing a tire and a method for manufacturing a tire, which can suppress abrasion and deformation of a combined mold due to thermal expansion and manufacture atire with excellent appearance. This mold (2) is provided with a plurality of split molds (4) and an annular side plate (6), and the inner peripheral surfaces (12) and the outer peripheral surfaces (14) of the plurality of split molds (4) are arc-shaped in plan view. At room temperature, when the plurality of split dies (4) are arranged around the side plate at equal intervals, a gap (26) exists between the adjacent split dies (4). The width (Go) of the gap (26) on the outer peripheral surface (14) side of the split die (4) is greater than the width (Gi) of the gap (26) on the inner peripheralsurface (12) side of the split die.

Description

technical field [0001] The present invention relates to a mold for tire manufacturing and a tire manufacturing method. Background technique [0002] A typical tire manufacturing mold has multiple split molds and ring-shaped side plates. Under top view, the outer peripheral surface and inner peripheral surface of each composite mold are arc-shaped. The plurality of split molds are arranged in a ring shape around the outer periphery of the side plate. Thus, these split molds and side plates are combined to form a cavity into which the green tire is placed. Typically, the material of the combined mold is aluminum alloy, and the material of the side plate is steel. [0003] In tire manufacturing, a green tire is heated and pressurized in a mold. This heating thermally expands the split mold and the side plates. The coefficient of linear expansion of aluminum alloy is greater than that of steel. By heating, the split mold expands more violently than the side plates. Theref...

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