SU1235743A1 - Device for carrying fumes outside mould cavity - Google Patents

Description

The invention relates to oo.iacTH priest-) of r1O.ti and third materials and is prediagnosed to remove gases from the cavity of the iress form, in particular, the molding and vulcanization of pneumatic h1in tires.

The purpose of the invention is to increase the reliability of the device by preventing its channels from clogging.

FIG. Figure 1 shows a device mounted in an iress form for molding and vulcanizing pneumatic tire tires; in fig. 2 - channel with an insert; in fig. 3 shows section A-A in FIG. 2; in fig. 4 shows a section BB in FIG. 2

The device for removal of gases from the cavity of the mold contains through-channels 2, made in the body of the mold 1, with the cavity of the mold with the atmosphere, and cylindrical inserts 3 with bald spots 4 installed in the channels 2 with tension on the sides. The flats 4 are located, the wives of the paclonio to the longitudinal axis of the insert 3 with the formation of a 5 on one of the ends of the insert. The inserts 3 by projections 5 oblique towards the cavity of the mold 1. At the same time, between the side walls of the channels 2 and the flips 4 of the inserts 3, air pockets 6 are formed, tapering from the cavity of the mold to the outside, i.e. Reduced with depth. For example, with an insert length of 7 mm, the width of pocket b at the inlet is 0.3 mm, and at the exit 0.05 mm.

The device works as follows.

In mold I, a blank of pok1 p11ki 7 is laid and the mold is closed. Air remains between the zag () and the walls of the mold, which when molded into the nozzle, is displaced from the cavity of the press (with a cutting mixture and escapes through the air pockets 6 and channels 2 into the atmosphere. The rubber mixture fills the cavity of the mold). into the pockets 6. Then vulcanization is carried out. Under these conditions, due to the better heat transfer, the rubber mixture is cured in the mantels 6 faster than the liing of the cover 7 because the viscosity of the rubber mixture is large and increases during the vulcanization process and the width of the pockets 6 on in is small (0.3 mm), then the rubber mixture flows into them med.tepno and b, the pagodar narrows the pockets to a depth of no more than 1 mm. When unloading the vulcanised tire from the extrusion mold from the pockets 6, 6; iaro- dar in their wedge form, they are easily removed without opening the channels and not clogging the channels. The extrusions remaining on the cover are thin (no more than 0.3 mm) and short (more than 1 mm), and therefore not a port t kind of tires and no trimming.

If there are inserts offered by (|), the mold can be cleaned using bo, 1B-shch number of cooking, and the inserts themselves can be easily made by stamping.

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5-5

/ S 5 3 B

eri 2

Claims (1)

DEVICE FOR GAS DISCHARGE FROM THE PRESS-FORM CAVITY, containing through channels made in the mold body, communicating the mold cavity with the atmosphere, and mounted on the sides of the groin with an interference fit on the sides of the flats with flats. characterized in that, in order to increase the reliability of the device, the flats are located obliquely to the longitudinal axis of the insert with the formation of a protrusion at one of the ends of the insert, and the insert is the last facing the cavity of the mold.