RU2376138C1 - Vulcanisation method of rubber-chord items and press mould for its implementation - Google Patents

Abstract

FIELD: production processes.

SUBSTANCE: invention refers to procedure and equipment for vulcanisation of general rubber items, namely to press moulds and vulcanisation method of rubber-chord sleeve-type items. The effect is achieved with press mould for vulcanisation of rubber-chord sleeve-type items, which includes upper and lower half-moulds. At that, press mould includes curing bag so that heat carrier of required pressure is supplied to it, base rings which comprise forming surface, and cone semi-rings which finally form edge of the item and provide tension of chord threads.

EFFECT: improving quality of items and simplifying vulcanisation process of rubber-chord sleeve-type items.

2 dwg

Description

The invention relates to technology and equipment for the vulcanization of rubber products, in particular to molds, and to a method for vulcanizing rubber-cord products of sleeve type.

A known method and device for the manufacture of tubular products (Lepetov VA "Rubber technical products" .- L .: Chemistry, 1976, p.126-128), which are currently used. According to the known method, the outer surface of the sleeve is coated with lead, and then the coolant is pressurized, followed by vulcanization, inside the product. The lead press for sleeves has a pressure chamber for molten lead. The hydraulic cylinder is located in the upper part of the press and mounted on the beam. During operation of the press, the rod associated with the piston enters the pressure chamber and squeezes out hardening lead through the press head into the annular hole formed by the mouthpiece and hollow mandrel. A sleeve extends through the channel in the mandrel. Compressed air is supplied to the sleeve to prevent crushing. The mandrel and mouthpiece have hollow walls and are cooled by running water. Leaded sleeves are vulcanized in boilers. To remove the lead shell after vulcanization, the sleeve is stretched between two knives, longitudinally cutting the shell from two opposite sides, as a result of which the shell breaks into two halves and is removed.

The known existing method and device have several disadvantages: the bulkiness of the process, requiring the application and removal of the lead lining; the inability to supply a coolant with the pressure necessary for high-quality crimping of the cord layers into the product; increased production hazard.

The closest analogue of the claimed mold for vulcanizing rubber-cord products of the hose type is a mold (SU 291805, IPC B29D 23/00, publ. 01.01.71), containing the upper and lower half-forms forming the forming surface, and sealing cones.

A disadvantage of the known invention is the lack of a cooking diaphragm and conical half rings in it, which ensure the final molding of the bead and the tension of the cord. The absence of these parts does not allow for high-quality crimping of the cord layers.

The technical result of the invention is the elimination of these shortcomings, improving the quality of products, simplifying the process of vulcanization of rubber cord products of sleeve type.

The technical result is achieved by the fact that the product is vulcanized in the mold using a cooking diaphragm, which provides pressure testing of the cord layers due to the heat carrier pressure supplied to it, and that the parts that provide the final molding of the bead of the product and the tension of the cord are made in the form conical half rings.

The invention is illustrated by drawings:

figure 1 - mold in the closed position;

figure 2 - mold in the molding position.

The mold for vulcanizing rubber-cord products of the hose type contains the upper 1 and lower 2 half-molds, cooking diaphragm 3, side rings 4 and conical half rings 5.

Vulcanization in the mold is as follows.

In the initial position (figure 2), the mold is open. In the lower 2 half-mold, a blank of rubber-cord product is inserted with a cooking diaphragm, conical half-rings 5 and bead rings 4. Then the mold (Fig. 1) is closed by the upper half-mold 1 and placed, for example, in an autoclave press, where the pressure supplied autoclave press plunger, a load is created in excess of the spacer force. Due to the movement of the semirings 5 when closing the mold, the sides of the rubber cord product are molded and the cord threads are tensioned. Inside the cooking diaphragm through the piping system of the autoclave press, the coolant of the required pressure is supplied and the product is cured according to the established mode.

The proposed device allows to simplify the process of vulcanization of rubber-cord products of sleeve type, to exclude the laborious process of applying and removing the lead sheath, and also allows you to vary the pressure of the coolant in the cooking diaphragm to achieve the required quality of crimping the layers of the cord.

The design of the proposed mold provides the implementation of the technological process of vulcanization of rubber-cord products.

The company has positive experience in vulcanizing high-quality rubber products of the sleeve type in the claimed mold according to the proposed method.

Claims (1)

A mold for vulcanizing rubber-cord products of a hose type, comprising an upper and lower half-mold, characterized in that the mold contains a cooking diaphragm with the possibility of supplying the necessary pressure medium to it, side rings that form the forming surface, conical half rings that finally form the board products and provide tension of cord threads.

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