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.

A mould element (18) intended to be attached in a mould (10) for vulcanizing tires, the mould element (18) having the form of a skin with a thickness (E) comprised between 0.25 and 6 mm and comprising a bearing surface (20) with, on the opposite side, a moulding surface (22) intended to form all or part of the external surface of the tire. The mould element comprises a pattern (30) comprising a plurality of recessed (19, 21, 112) or protruding (106, 107) elements, formed as integral parts of the mould element (18).

The invention relates to a tyre (1), the tyre (1) comprising: a tread (2) having a tread surface (3) for contacting the ground and at least one groove-like recess (4) therein forming a free space (5), the recess (4) having a longitudinal extension A along the surface (3) and a depth B measured in a radial direction with respect to a radial axis (X) of the tyre (1) from the tread surface (3) to a radially innermost position (19), wherein the free space (5) can be divided into a sipe portion (6) opening to the tread surface (3) and a groove portion (7) located radially inwards the sipe portion (6), wherein in a cross sectional view transverse to the longitudinal extension A of the recess (4) the groove portion (7) has a groove contour (9), with a longitudinal axis (X), wherein a corresponding width of the groove contour (9) has a local maximum Wg at a height H referred to a spatial extent E of the groove contour (9) in the direction of this longitudinal axis (X) and wherein the groove portion (7) has at least one transition section along the longitudinal extension A of the recess (4), between the ends (17, 18), wherein the height H of the groove portion (7) changes by an amount H. The invention further relates to a corresponding wheel for an automobile comprising such kind of tyre (1), a blade (11) for forming a part of a corresponding tyre moulding form and a corresponding moulding form.

A tire vulcanization mold disclosed herein includes sectors 13 divided in a tire circumferential direction and molding a tread portion 1 of a tire, and a pair of upper and lower side plates 11 and 12 molding a sidewall portion 2 of the tire. Mold parting lines 16a and 17a formed by the sectors 13 and a pair of the upper and lower side plates 11 and 12 are located in the tread portion 1. The mold parting lines 16a and 17a are set within a range PR which accounts for up to 7.5% of a width BW of an outermost belt 5a of the tire on each of an outer side and an inner side than belt end positions BP of the outermost belt in a tire width direction.

The present invention provides a pneumatic tire including a tread block 10 having a sipe 100 formed therein. A three-dimensional inclined surface groove 110 is formed at an upper portion of the sipe 100 formed in the tread block 10, such that three-dimensional inclined surface protrusions 16 and inclined surface grooves 17 respectively formed on both sipe side wall surfaces 15 forming the sipe 100 so as to correspond to each other may minimize a movement of the tread blocks 10 due to a stress generated from the tire contacting with a ground during driving, so as to increase a traction force. In addition, a lower through groove is formed at a lower portion of the sipe 100 formed in the tread block 10, such that it is possible to reduce a resonance noise of the tire occurring when driving, more easily and automatically discharge the foreign matters caught in the sipes 100 of the tire during driving, and improve a traction performance of the tire in the latter half of the tire lifespan by dividing the remaining tread block 10 after the upper portion of the tread block 10 is worn.

Process for additive manufacturing of at least one part. At least one layer of powder is deposited on a working surface using a layering device for distributing the powder mobile in translation along the surface and at least partly fusing the layer deposited using a beam of energy. The depositing and fusing steps are repeated in order to form the part by stacking of fused layers. The distribution component of the layering device is mobile in a direction substantially parallel to the direction of the length of each fused layer of the part. The depositing and fusing steps are repeated in order to form the part so that the length of the part extends along a direction substantially parallel to the stacking direction of the fused layers and so that the head of the part is oriented substantially perpendicular to the working surface.

Process for the additive manufacturing of at least one part by powder sintering or melting using at least one beam of energy. A step of deposition and selective melting of stacked layers of powder manufactures at least one intermediate element comprising the part and at least one local reinforcing element having a split tubular shape that surrounds one of the lateral end faces of the part and that face each of the frontal faces of said part adjacent to said end face, said reinforcing element extending in a direction substantially parallel to the stacking direction of the layers. The part and the local reinforcing element are separated.

The invention relates to a vulcanization mold for pneumatic vehicle tires with cast mold segments (1) forming a tread of a pneumatic vehicle tire, which at least have ribs (5, 6) for forming grooves in the tread and sipes (11) for forming incisions in the tread. The invention was based on the object of creating a vulcanization mold of the type described at the outset which, while retaining the inexpensive casting method for the mold segments, enables tread profiles to be formed with grooves and incisions, with the incisions being able to have chamfers in the transition to adjacent blocks in the tread profile and in which the manufacturing limitations described are minimized. This object is achieved in that the elements (5, 6, 11) for producing grooves and incisions are at least partially subsequently introduced into the mold segments (1) after the mold segments (1) have been cast.

Set of moulding elements suitable for being inserted into a mould for moulding a tyre, said set comprising a main strip (1) and at least one secondary strip (2), said secondary strip (2) comprising a first secondary strip portion (3) and a second secondary strip portion (4), the second secondary strip portion (4) extending the first secondary strip portion and said first (3) and second (4) secondary strip portions extending on either side of the main strip (1) and said set of moulding elements comprising means (10) of assembling the secondary strip (2) with the main strip (1).

The present invention is directed to a 3D-printed tire segment model having a tread portion comprising a plurality of grooves, ribs and/or tread blocks, and a plurality of blades extending out of the ribs and/or tread blocks, wherein the tire segment model is made of a 3D-printed polymer. Moreover, the present invention is drawn to a method of making a tire mold segment, including the step of 3D-printing the above tire segment model with a polymer.