SU891472A1 - Press mould for vulcanizing pneumatic tyre casings - Google Patents

Description

(54) PRESS FORM FOR VULCANIZING PNEUMATIC TIRE COVERS

one

The invention relates to the manufacture of pneumatic tires and is intended for the vulcanization of tires.

A known mold for vulcanizing tires of pneumatic tires, comprising radially movable segments, a locking cone, upper and lower forming plates, and a hydraulic cylinder mounted on the steam chamber for fixing the sides and sidewalls of the tire 1.

However, this mold is complex and requires a special design of the traverse and the steam chamber.

Closest to the proposed technical essence and the achieved effect is a mold for vulcanization of tires pneumatic tires, which contains radially movable segments with an outer conical surface, interacting with the segments of the locking cone to hold the segments in the closed position, the lower and axially movable upper forming plates and spacer springs placed between the top plate and the locking cone 2.

A disadvantage of the known mold is the great friction between the upper forming plate and the end surface of the segments, leading to increased wear of the elements of the mold.

The purpose of the invention is the friction between the upper forming plate and the end surface of the segments during their radial movement.

To achieve this goal, a mold for vulcanizing tires of pneumatic tires, containing radially inflatable segments with an outer conical surface, a locking cone interacting with segments to hold the segments in the closed position, lower and axially movable upper forming plates and spacer springs placed

Claims (2)

tS between the top plate and the locking cone, provided with additional spacer springs installed between the locking cone and the segments and having cups with thrust bearings mounted on them that interact with the end surface of the segments, and through holes in the top plate for mounting additional spacer springs and glasses located parallel to the central axis of the mold. FIG. 1 shows a mold at the beginning of its closure; in fig. 2 - the same, at the beginning of the radial course of the sectors; in fig. 3 shows the node I in FIG. 2; in fig. 4 - mold in the closed position. A tire vulcanization mold contains radially movable segments 1 with a conical outer surface 2, a locking cone 3 that interacts with the segments to hold the segments in the closed position, a lower 4 and an axially movable upper 5 forming plates. Between the upper plate 5 and the locking cone 3, spacer springs 6 are placed. To reduce friction between the upper plate 5 and the upper end surface of the segments 1, between the locking cone 3 and the segments 1, additional spacer springs 7 are installed, which have glasses 8 with thrust bearing plates mounted on them 9 (Fig. 3), interacting with the upper end surface of the segments. Through holes 10 are provided in the upper plate 5 along its periphery for installation of additional spacer springs 7 and glasses 8 arranged parallel to the central axis of the mold. The mold works as follows. In the mold, a blank of the tire 12 is installed on the diaphragm 11. Then the locking cone 3 is lowered along with the segments 1 and the upper forming plate 5 which engage with it. At the same time, the spacer springs 6 and 7 are decompressed. When the mold is closed, the upper forming plate 5 first engages with the workpiece of the liner 12, fixing the boards in height and partially the sidewalls of the tire when it is molded (Fig. 1). Upon further closure of the mold, the spacer springs b and 7, squeezing, begin to oppose the pressure of the forming steam inside the diaphragm 11. At the end of the molding, when the segments 1 come into contact with the lower forming plate 4, radial movement begins under the influence of the locking cone 1 segments 1 to the center of the mold (Fig. 2). The upper end surface of the segments slides along the thrust bearings 9 pressed by the spacer springs 7. When the segments 1 are completely flattened and the spacer springs 6 and 7 are in a compressed state, the mold is closed. Next, the coating is vulcanized in the usual way. After the end of the vulcanization cycle, the locking cone 3 rises. In this case, the radial movement of the segments 1 from the center of the mold (Fig. 2) is first carried out when interacting with the thrust bearing 9, pressed by the spacer springs. At this moment, the beads and partially the sidewalls of the lining remain fixed, as the upper forming plate 5 remains in the same position. After the segments 1 have completely dissolved, freely hanging on the stop cone 3, the upper forming plate 5 rises and the lining is pushed out of the mold. In the proposed mold, the friction between the upper-forming plate and the end surface of the segments during their radial displacement is significantly reduced, as a result of which the forces acting on the rubbing surfaces are significantly reduced. Reduces wear of mold design elements. Formula of the invention A mold for vulcanizing tires of pneumatic women, containing p-adially movable segments with an outer conical surface, interacting with segments a locking cone to keep them in a closed position, the lower and axially movable upper ones plates and spacers placed between the upper plate and the locking cone, characterized in that, in order to reduce friction between the upper forming plate and the end surface of the segments when they are radially moved, it is provided with additional spacer springs installed between the locking cone and segments and having cups with thrust support plates mounted on them that interact with the end surface of the segments, and through the periphery of the upper plate there are holes made to install additional spacer springs and glasses located parallel to the central axis of the mold. Sources of information taken into account in the examination 1.Patent of France No. 1524848, cl. At 29 h pub. 1966. 2. US patent number 3797979, cl. 425-47, published. 1974 (prototype). YU FIG. J