Rigid core for tire formation

Abstract

In order to suppress inflow of rubber to an exhaust groove, a core body comprises a plurality of core segments divided in the circumferential direction, and an exhaust grooves having an open end opening in a core-side tire molding face are arranged on the mating face of at least one of core segments adjacent in the circumferential direction. The exhaust groove comprises a tread exhaust groove, the open end of which opens in a portion of a core-side tread molding face, and / or a side exhaust groove which opens in a portion of a core-side side molding face. The tread exhaust groove has an inclined groove portion extending at an angle (theta1) in relation to the radial direction of the tire from the open end, and the side exhaust groove has an inclined groove portion extending at an angle (theta2) in relation to the axial direction of the tire from the open end.

Description

technical field [0001] The present invention relates to a rigid core for forming a tire in which vent grooves are formed on joint surfaces of core segments. Background technique [0002] In recent years, in order to improve tire forming accuracy, a tire forming method using a rigid core (hereinafter, sometimes referred to as a core processing method) has been proposed (for example, refer to Patent Documents 1 and 2). The rigid core includes a core main body having an outer shape conforming to a shape of a tire inner cavity surface of a vulcanized tire. Then, a raw tire is formed by affixing tire constituent members sequentially to the core main body. The green tire is put into a vulcanization mold together with a rigid core, whereby the green tire is vulcanized and molded by being sandwiched between a core body as an inner mold and a vulcanization mold as an outer mold. [0003] Such as Figure 7 As shown in (A), in order to disassemble and remove the core body a from the ...

AI Technical Summary

Problems solved by technology

However, in this case, there is a problem that the strength of the connecting portion becomes insufficient due to repeated large-scale thermal expansion, and the durability of the core segment decreases.

In addition, the above scheme still does not consider the problem of rubber flowing into the exhaust passage

Images