SU914305A1 - Mould for vulcanizing pneumatic tyre casings - Google Patents

Description

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

Known mold for vulcanization of tires pneumatic tires, containing the upper and lower half-form, closed with a crank mechanism 01.

Such a constructive implementation of the known mold does not allow its use in automatic lines, which limits the range of its application.

Closest to the invention is a mold for vulcanizing tires of pneumatic tires, containing two half-molds locked with a bayonet lock, on the plane of the connector of which are made respectively an annular groove and an annular helix that interact with each other.

2

In this mold, the protrusion and groove are made of trapezoidal shape, interacting along conical surfaces.

During the operation of the mold, under the influence of the thrust force, a gap is formed between the mating surfaces of the protrusion and the groove, which leads to the formation of the extrusion on the connector surface of the half-molds C21.

After the end of the cycle of visualization and removal of the thrust force, the diverged central parts of the half-molds tend to return to their original position. Since the gap between their planes of the connector is made by vulcanizing extrusion, the half-molds are wedged by a bayonet lock and a significant power drive is required to rotate the bayonet's last.

The purpose of the invention is to reduce you pressing and power reduction when 3 914305 4

water for opening the bayonet lock.

To achieve this goal in the mold for vulcanizing pneumatic tires, containing 5-boiling latched bayonet "lock the two molds, which are made on the connector, respectively, an annular groove and an annular projection plane, which interact with one another, ¹⁰

the annular groove and the annular protrusion are filled with a U-shaped cross section.

With such a constructive implementation of the mold, the protrusions of the groove of the half-molds interact over cylindrical surfaces, as a result of which the divergence between the semi-molds under the influence of the thrust force does not increase the gap between the mating side surfaces 20 of the protrusion and the groove, which prevents the formation of the extrusion outside the annular groove from the center of the mold.

Kah FIG. 1 shows the proposed 25 mold ’, figure 2 - the protrusion and groove, the cross-section.

The mold contains upper 1 and lower 2 half-molds fixed in steam chambers 3 and 4 and locked with a 30-bayonet lock 5.

On the plane of lifting of the lower half-form 2, an annular protrusion 6 is made with a U-shaped cross section, and on the top 1, a corresponding ₃₅ annular groove 7 is formed. The height of the annular

the protrusion 6 is greater than the maximum possible gap, caused by the thrust force during curing, but less than the depth of the annular groove.

Thus, the maximum diameter of the extrusion is limited to the internal diameter of the annular protrusion 6, which reduces the jamming effect of the extrusion and reduces the effort required to open the bayonet lock, and, consequently, reduce the power of its drive.

Claims (1)

Claim A mold for vulcanizing tires of pneumatic tires, containing two half-molds locked with a bayonet lock, on the plane of the connector of which an annular groove and an annular protrusion are made, which interact with each other, in order to reduce the extrusion and reduce the drive power of the bayonet lock, the annular groove and the annular protrusion are made with a U-shaped cross section.