A tire vulcanizing mold is disclosed capable of accurately providing a clearance, from which air existing between a green tire and a side mold is released, on a side shaping surface and thereby preventing shaping defect. The tire vulcanizing mold includes an upper and lower pair of side molds having side shaping surfaces. Each of the side molds includes a side mold main body, plural pieces, and a clearance provided between the side mold main body and each of the pieces. The side mold main body includes plural recesses, each of which is opened to the side shaping surface and an outer surface, at spaced intervals. Each of the pieces is fitted into the recess and forms the side shaping surface with the side mold main body. The clearance is opened to the side shaping surface and extends from an inner side to an outer side.

A holding body that holds the molding part on the mounting surface where the molding part is attached to. The plurality of bolts attach the molding part to the holding body while pulling the molding part towards the holding body to correct a distortion of the molding part. The molding part has the contacting surface coming in contact with the mounting surface, the projection rows each of which consists of the plurality of projections arranged in the tire circumferential direction at intervals, and screw holes each of which is formed in the projection. The holding body has the concave parts each of which houses the projection of the molding part and the insertion holes each of which opens at the bottom surface of the concave part and into which the screw part of the bolt is inserted.

A vent plug is mounted in a vent hole open in a molding face of a tire cure mold. The vent plug has a cylindrical housing having a vent path in itself, a stem that is inserted into the housing and serves as a valve element for opening and closing the vent path, and a coil-shaped spring that biases the stem toward a cavity so as to open the vent path. The vent path includes an outer inlet portion open in an annular shape between a valve seat provided to the housing and a head portion of the stem that comes in contact with the valve seat, and an inner inlet portion open in an annular shape on an inner side of the outer inlet portion.

A vent plug is mounted in a vent hole open in a molding face of a tire cure mold. The vent plug has a cylindrical housing having a vent path in itself, a stem that is inserted into the housing and serves as a valve element for opening and closing the vent path, and a coil-shaped spring that biases the stem toward a cavity so as to open the vent path. The stem includes a columnar trunk portion and a head portion that comes in contact with a valve seat at an opening portion of the housing to thereby close the vent path. The stem turns as the stem moves along an axial direction.

The liming element for a tire mould comprises a body 12 delimiting a moulding surface 14 intended to at least partially mould a rolling surface of the tire, at least one injection nozzle 26 arranged on the body and provided with at least one outlet orifice 26a, at least one supply duct extending inside the body and the injection nozzle while being in communication with the said outlet orifice, and at least one shut-off member 30 mobile with respect to the injection nozzle between an outlet orifice closed position and an outlet orifice open position. The body 12, the injection nozzle 26 and the shut-off member 30 are manufactured by the deposition and selective melting of stacked layers of powder.

A tire vulcanization mold 10 has a plate-like sipe blade 26 used to form a sipe in a tread portion of a pneumatic tire. The sipe blade 26 protrudes to a mold inner side from a mold inner surface 30, and is provided with a through-hole 28 drilled to penetrate through the sipe blade 26. An acute angle portion is formed between a surface 29a of the through-hole 28 on the mold inner side and a surface 27 of the sipe blade 26, and a diameter of the through-hole 28 is larger than 1 mm.

The vent valve (10) for venting bores of vulcanization molds, which includes the sleeve (1), with the inner cylindrical hollow (1.1), ended with the valve conical hole (1.2) and the cylindrical hole (1.4) along the sides, whereas the sleeve (1) may be inserted into the vulcanization mold hole, the pin (2), movably located on the spring (3) in the inner cylindrical hollow (1.1), whereas the pin (2) contains the lower cylindrical part (2.4), ended in its lower part with the lower conical part (2.4.1), and the upper conical part in the upper part (2.4.2), the upper conical part (2.4.2) is followed by the central cylindrical part (2.5), followed by the connecting cylindrical part (2.6), whereas the diameter of the central cylindrical part (2.5) is smaller than the connecting cylindrical part (2.6) as well as the lower cylindrical part (2.4). The lower cylindrical part (2.4) and the central cylindrical part (2.5) are divided into four flexible legs (2.7) to (2.10), forming the flexible collet. Four flexible legs (2.7 to 2.10) are shaped identically and partially reach the connecting cylindrical part (2.6).

A fixing hole of a mold for rubber article is easily inspected and the vent piece is securely fixed in the fixing hole. A vent piece having a vent hole is fixed in a fixing hole of a mold, so as to manufacture the mold having the vent hole. The vent piece has a first inspection part to be inserted into the fixing hole, a caulking part thicker than the first inspection part and is to be fixed in the fixing hole by caulking, and a second inspection part positioned between the first inspection part and the caulking part and is thicker than the first inspection part and thinner than the caulking part. When the first inspection part is inserted into the fixing hole but the second inspection part is not inserted into the fixing hole, the caulking part is fixed in the fixing hole by caulking.

Disclosed is the invention having an object to prevent vent spew from being cut and clogged in vent holes of an aluminum mold in vulcanization molding of a tire containing an inorganic compounding agent. The present invention relates to a mold for vulcanizing and molding a tire containing an inorganic compounding agent, in which the mold is made of aluminum, and an embedded vent sleeve is made of stainless or metal containing 15% by mass or more of chromium.

A tire tread mold which allows more flexibility in the design of tread patterns and which reduces the risks of blades being damaged during molding operations is needed. Such a mold has a tread mold portion which is divided in into a plurality of mold segments having an inner face curved along the circumferential direction according to an arc angle , each of the mold segments including laterally extending blades forming projections from their inner face; wherein the mold segments have a first end portion, a second end portion and a central portion; wherein laterally extending blades of the central portion extend in the operating direction, and wherein laterally extending blades of the end portions are inclined blades that extend in a direction forming an angle with the operating direction, wherein with angle being less than half of angle .