RU2597396C1 - Method for curing curved-type sleeve inserts and mold for its implementation - Google Patents

Abstract

FIELD: chemistry.

SUBSTANCE: invention relates to the technology and equipment for curing rubber articles, particularly to production of curved-type sleeve inserts. Technical result is increased quality, reliability and durability of curved-type sleeve inserts. Journals and frame are fixed on the platform, rigid mandrel is fixed on the journals, and brace is wound on the frame and outer shell, then sleeve inserts are subjected to vulcanization.

EFFECT: method for producing curved-type sleeve inserts, which includes fixing cooking diaphragm on a rigid mandrel, forming marginal parts of sleeve insert using metal flanges, winding of the outer shell.

2 cl, 2 dwg

Description

The invention relates to the manufacture of sleeve inserts of a curvilinear type intended for the transport of liquid media in pipelines.

A known method of vulcanization of rubber-cord products and a mold for its implementation (RF patent 2376138, IPC B29D 23/00, publ. 12/20/2009. Bull. No. 35), by which crimping the cord layers is carried out due to the cooking diaphragm. The mold contains a cooking diaphragm, side rings, conical half rings.

The disadvantage of this method is the impossibility of its use in the vulcanization of sleeve inserts of a curvilinear type.

The closest in technical essence and the achieved result is a mold (RF patent 2418678, IPC В29D 23/00, publ. 05.20.2011. Bull. No. 14), which contains a rigid mandrel with a cooking diaphragm mounted on it, metal flanges and an outer a shell made by winding a tape of inextensible and not subject to heat shrink material.

A disadvantage of the known mold is the low reliability, low quality and fragility of the vulcanized curvilinear sleeve inserts, since there is a difference in thickness of the internal rubber sealing layer in the curved vulcanized hose insert, i.e., a decrease in the wall thickness of the internal rubber sealing layer in the zone of small radius of curvature of the insert and thickening of the wall of the inner sealing layer of rubber in the zone of a larger radius of curvature of the insert. This occurs at the time of supply of the coolant during vulcanization, there is a radial displacement of the outer shell relative to the longitudinal axis of the mandrel towards a larger radius of curvature of the insert.

The technical result of the claimed invention is to improve the quality, reliability and durability of the sleeve inserts of a curvilinear type.

The technical result is achieved by ensuring the constancy of the wall thickness of the inner sealing layer of rubber over the entire cross section and length by fixing the rigid mandrel in the pins mounted on the platform, winding a coupler of practically inextensible material on the mold to limit the radial displacement of the outer shell relative to the rigid mandrel and fixing the outer shell in the area of the upper semicircle relative to the rack mounted on the platform.

The essence of the claimed invention is illustrated by the accompanying drawings, where:

FIG. 1 - mold, general view;

FIG. 2 - mold during the vulcanization process.

The claimed mold (Fig. 1) consists of a rigid mandrel 1 with a cooking diaphragm 2 fixed on it, metal flanges 3, 4, the outer shell 5, platform 10, on which pins 6 are fixed, which are intended to be fixed on the platform 10 of the rigid mandrel 1 with assembled sleeve insert of curvilinear type 9, tie 8 to limit the outer shell 5, stand 7 for winding the tie 8. The tie 8 is made of high-modulus chemical fibers, for example, Rusar type.

A method of manufacturing a sleeve insert curvilinear type is as follows (Fig 1).

First, the sleeve insert of the curvilinear type 9 is assembled on the rigid mandrel 1 with the cooking diaphragm 2 fixed on it, the side parts of the sleeve insert of the curvilinear type 9 are formed with metal flanges 3 and 4. Next, between the flanges 3 and 4, a bandage of the outer surface of the sleeve insert of the curvilinear type 9 is bandaged with tape practically inextensible and practically non-shrinkable material, thus forming the outer shell 5. Then fix the rigid mandrel 1 in the pins 6. Next, wrap the screed 8 around the outer shell 5 and the rack 7, fixed on the platform 10. The screed 8 fixes the position of the outer shell 5 relative to the longitudinal axis of the rigid mandrel 1 and the stand 7. The screed 8 presses the outer shell 5 to the outer surface of the sleeve insert of curvilinear type 9 and thereby limits the radial displacement of the outer shell 5 relative to the rigid mandrel 1, which ensures the constancy of the wall thickness of the inner sealing layer of rubber over the entire cross section and the length of the sleeve insert curvilinear type 9.

After winding the tie 8 around the outer shell 5 and the rack 7, the sleeve insert of the curved type 9 is vulcanized.

The claimed mold works as follows (Fig. 2).

The coolant under pressure, when fed into the cooking diaphragm 2, performs pressure testing from the inside of the sleeve insert of curvilinear type 9. Pressing the screed 8 against the outer shell 5 and restricting the radial displacement of the outer shell 5 with respect to the rigid mandrel 1 ensures the constancy and equal thickness of the inner sealing layer of rubber 11 of the curvilinear sleeve type 9 along the entire cross section and length, that is, the wall (b) of the inner sealing layer of rubber 11 in the zone of small radius (r) of curvature of the sleeve insert -type wall 9 is almost equal to (a) the inner liner rubber 11 in the zone of the larger radius (R) of curvature of the curved type tubular insert 9.

Thus, the claimed method of manufacturing a sleeve insert of a curvilinear type and the use of the claimed mold provide a constant wall thickness of the inner sealing layer of rubber over the entire cross section and length, which is a determining parameter to achieve the claimed technical result, namely, to improve the quality, reliability and durability of the sleeve inserts of curvilinear type.

The company has positive experience in the manufacture of high-quality curved-type sleeve inserts using the claimed manufacturing method and application of the inventive mold.

Claims (2)

1. A method of manufacturing a curved-type sleeve inserts, including fixing the cooking diaphragm on a rigid mandrel, forming the side parts of a curved-type sleeve insert with metal flanges, winding the outer shell, characterized in that the trunnions and stand are fixed on the platform, the rigid mandrel is fixed on the trunnions, and on the stand and the outer shell are wound with a screed, after which vulcanization of the sleeve insert is carried out. 2. A mold for vulcanization of curvilinear sleeve inserts containing a rigid mandrel with a cooking diaphragm fixed on it, metal flanges and an outer shell, characterized in that it further comprises a platform with axles fixed on it, a fixed mandrel on the axles, a rack fixed on a platform with a wound coupler, and an outer shell fixed relative to the rack.

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