SU914307A1 - Mould for producing diaphragms - Google Patents

Description

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

A known mold for the manufacture of diaphragms, containing two half-molds, a hard core and rigid protruding elements located on the latter for molding air. exhaust grooves on the surface of the diaphragm.

In a known mold, a diaphragm is made with grooves on a surface interacting with the core, since the air vent must be on the surface of the diaphragm interacting with the tire, then the diaphragm is turned into an operating position and removed from the diaphragm.

Usually diaphragms are made from butyl rubber, so they have

2

considerable rigidity, and for their turning out considerable efforts are required.

Furthermore, after eversion is not provided Aperture predetermined geometric form, which leads to the appearance of its walls undesirable stresses adversely influence the performance Single-operation of the diaphragm _1c.

The closest to the invention by the technical essence and attainable effect is a mold for the manufacture of diaphragms, contains ₁₅ zhaschaya two molds with wire members on the side of the cavity surface for forming Air Release grooves on the diaphragm and the rigid core vzaimo2 (acting end caps protrusions with (central the holes of the bases of the half-form C21.

Because of the small diameter and large depth of the half-form, the wire elements 3 914307 4

The cops are performed not to the whole depth of the half-molds, but only until the beginning of the shoulder area with a small radius of curvature. The installation of wire elements in this zone is difficult and practically impossible to perform, with the result that the diaphragms in this zone do not have air-vent grooves. This leads to incomplete venting of air from the cavity between the diaphragm and the tire, and, as a result, to the unavoidable marriage of “under-pressing on the toe of the tire bead”

• “underpressure on the sealing layer of tubeless tires”, etc. 15

The purpose of the invention is the provision of the possibility of manufacturing diaphragms with air exhaust grooves in the shoulder areas.

To achieve the goal _Z o

in the mold for the manufacture of diaphragms, comprising two mold halves with the wire members on the side of the cavity surface for forming Air Release Canada are wok 25 on the diaphragm and a hard core, end caps engaging the projections with the central openings of the mold halves bases, according to the invention interacting with tor- ₃₀ parts tsovymi The cores of the half-molds are made in the form of annular liners with grooves on the ends facing the core and are equipped with additional wire elements, ₃₅ left in the grooves.

FIG. 1 shows the proposed mold; in fig. 2 - a fragment of the ring insert; in FIG. 3, view A in FIG. 2; in fig. 4 - section bb in figure 2; .on FIG. 5 ~ section BB of FIG. 2

The mold for the manufacture of diaphragms contains the top 1 and bottom 2 half-molds with wire elements 3 on the side surface of the forming cavity 4 to form air-vent grooves on the diaphragm and a detachable hard core 5 that interacts with end protrusions 6 and 7 with ₅ θ central holes 8 of the bases of the half-form 1 and 2..

In order to enable manufacturing diaphragms with vozduhootvodyaschiya mi grooves in the shoulder regions ⁵⁵ of the interacting mutually with the core parts of the mold halves 1 and 2 are in the form kolItsevyh liners 9 and 10 with the grooves

11 on the butt ends facing the core and provided with additional wire elements 12 mounted

in the grooves 11. The grooves 11 can be located parallel to the forming cavity 4 or obliquely towards it (FIG. 3). One ends of the elements

12 secured in the blind ends of the grooves

11, and the second - at the ends of the liners

9 and 10 along the planes of their connector with half-molds 1 and 2 (figure 4). The fastening of the wire elements in the grooves is ensured by striking. On the planes of the connector liners 9 and 10 with the half-form ring protrusions 13 are made, connecting the wire elements 12 and forming an annular groove on the diaphragm.

For easy installation in liners

9 and 10 are made diametrically located threaded holes 14.

Ring liners 9 and 10 can be attached to the half-form by welding.

Half-shapes 1 and 2 have steam jackets 15 for heating.

In operation, the mold zagru- "dressing chamber placed weighed crude rubber, and the mutual intersection · ¹ displacements rubber mold halves is filled cavity 4 between the inner surface of the mold halves 1 and 2 and the core 5 · After vulcanization molding is carried out in a conventional manner the diaphragm. Then, when the mold is opened, a finished diaphragm is removed, having air vent grooves on the side surface and in the shoulder areas.

Made in the proposed mold aperture provides a reduction in the marriage of tires.

Claims (1)

Claim A mold for the manufacture of diaphragms, containing two half-molds with wire elements on the lateral surface of the forming cavity to form air-vent grooves on the diaphragm and a rigid core that interacts with end tabs with central holes of the half-molds, characterized in that air vent grooves in five 914307 6 shoulder areas, interacting with the end parts of the core part of the half-form is made in the form of an annular liners with grooves on the ends facing the core and provided with additional wire elements installed in the grooves.