SU772885A1 - Pressure mould for vulcanizing hollow articles - Google Patents

Description

one

The invention relates to the manufacture of rubber and rubber products and can be used in the tire industry to form and vulcanize rubber-cord shells in a mold.

A known mold for vulcanization of hollow articles, comprising a matrix with an annular forming cavity and an elastic forming diaphragm, the beads of which are fixed between the lid and the centrally arranged annular disks 1.

The known mold is unreliable in operation, since when the working medium is supplied, the diaphragm does not always take the correct position necessary to obtain a quality product.

The purpose of the invention is to increase the reliability of the mold.

To achieve this goal, a mold for vulcanizing hollow products containing a matrix with an annular mold and an elastic forming diaphragm, the beads of which are fixed between the lid and concentrically arranged annular discs, is equipped with a rigid annular diaphragm restrictor with through holes in the side wall mounted in the cavity of the diaphragm with the possibility of axial movement. On the lid, rotary bushings with internal threading are mounted, and the stop of the diaphragm is equipped with threaded rods that interact with rotary bushings.

FIG. 1 shows a mold, a longitudinal section; in fig. 2 - a cover with the ring limiter and a diaphragm; in fig. 3-5 position of the nodes of the mold

10 in the process.

The mold for vulcanization of hollow products contains a matrix 1 with an annular forming cavity and an elastic forming diaphragm 2, the sides of which are fixed between the cover 3 and concentrically arranged annular disks 4 and 5. The latter are fastened to the cover with bolts 6. In the cavity of the diaphragm 2 with the possibility of axial A rigid annular restrictor 7 of the diaphragm with through holes 8 in the side wall is mounted.

On the lid 3 rotatable sleeves 9 are mounted for connection with a drive for the vertical movement of the limiter 7.

(not shown). The sleeves 9 have internal threading. The stopper 7 is provided with threaded rods 10 interacting with the rotary bushings 9. The tightness of the cavity of the diaphragm 2 is provided by sealing cuffs 11 and pressure rings 12. Channels 13 are provided to supply the coolant to the cavity of the diaphragm 3.

The operation of the mold is carried out as follows.

The pre-assembled rubber-cord blank of the article 14 is installed in the matrix 1 (Fig. 3). Then the lid 3 is lowered and the diaphragm 2 is introduced into the cavity of the workpiece. The mold is closed and the sides of the product 14 are pre-pressed using circular discs 4 and 5 (Fig. 4).

Next, by successively turning the sleeves 9 counterclockwise (this operation can be carried out, for example, using an Allen key), the annular restrictor 7 is moved downward to preload the forming diaphragm 2 in order to eliminate its folding that occurs when the diaphragm is inserted into the workpiece cavity 14 (Fig. 1). After this, the mold is fed to a vulcanization autoclave press (not shown), where according to the preset mode, the product 14 is vulcanized. At the same time, the heat transfer medium flows through the channels 13 under pressure 13 to the circular cavity through the openings 8 of the ring restrictor. shrinks (pushes apart) the forming diaphragm 2 and produces molding and vulcanization of the product 14 (Fig. 5). At the end of the vulcanization and cooling cycle

the mold is opened and the finished product is removed. Further, the mold operation cycle is repeated.

In the proposed mold, the forming diaphragm folds are prevented from forming inside the workpiece even after the heat transfer medium is pressurized into the internal cavity of the forming diaphragm during vulcanization of the product, which ensures reliable operation of the mold and high quality of the finished products.

Claims (2)

1. A mold for vulcanization of hollow articles containing a matrix with an annular forming cavity and an elastic forming diaphragm, the beads of which are fixed between the lid and concentrically arranged annular disks, characterized in that, in order to increase the reliability of operation of the mold, it is equipped with a rigid an annular stop of the diaphragm with through holes in the side wall mounted in the cavity of the diaphragm with the possibility of axial movement. 2. A press mold according to claim 1, characterized in that rotary bushings with an internal threaded thread are mounted on the cover, and the stop of the diaphragm is provided with threaded rods cooperating with rotary bushings. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 576224, cl. In 29 N 5/02, 1976 (prototype).