RU2694338C2 - Mandrel for making articles from composite fibrous materials and method of making mandrel - Google Patents

Abstract

FIELD: manufacturing technology.

SUBSTANCE: group of inventions relates to production of equipment for making articles from composite fibrous materials and can be used in processes of making articles by methods of winding. Proposed mandrel for making articles from composite fibrous materials comprises sector planks arranged symmetrically about its axis of rotation and made inside hollow shaft, each of which is connected with its inner surface with possibility of reciprocal movement. Method of making mandrel for making articles from composite fibrous materials includes connection of sector planks with shaft. Connection of sector planks is performed with outer surface of shaft or with its inner surface by connection of each sector plate with shaft by means of one or several bodies, one side is rigidly connected to shaft, and other side is rigidly connected to sector plate, with possibility of reciprocating movement of sector planks relative to shaft.

EFFECT: simplified design, increased reliability and efficiency of mandrel operation, reduced weight, reduced power inputs both for production of mandrel and for production of items, increased service life, as well as expanded range of equipment for specified purpose.

3 cl, 3 dwg

Description

Mandrel for the manufacture of products from composite fibrous materials and method of making the mandrel. The invention relates to the production of equipment for the manufacture of products from composite fibrous materials and can be used in technological processes of manufacturing products by methods of periodic winding, continuous winding, including the method of pultrusion using dies of various geometries.

A device for continuous manufacture of tubular products from reinforced plastics is known, comprising a cantilever shaft with sector slats placed on its outer surface in contact with a driving feed cam mounted on a shaft (SU 378327, B 29d 23/12, published 18.04.1973 Bul. No. 19 ). However, this device has a complex structure and low reliability.

Famous mandrel for the manufacture of pipes by the method of continuous winding, containing blocks of the sector slats without relying on the shaft (RU 2390416 C2, V29C 53/82, publ. 27.05.2010 Byul. 15). This mandrel is a rigid "central shaft" that forms a cylindrical surface composed of sections of Tritauri surface and does not require the installation of support elements in the zone of the product's time on the mandrel. However, in order to provide reciprocating movement of each block, a support containing rolling or sliding elements is necessary. Known mandrel for the manufacture of tubular products winding, including the Central shaft, mounted on it through the balls sector slats, bearing at the ends of the fingers with rollers mounted for contact with the copier, fixed to the end of the central shaft ring with guides located between the sector slats (SU 1353645 A1, В29С 53/82, В29К 105/08, B29L 23/22, published 23/11/1987 Byul. (No. 43). The disadvantage of the mandrel is low life. The presence of rolling elements does not allow to increase the efficiency. In addition, when the product is wound at the time of its formation, forces arise that hold the sector strips against the shaft, including in connection with the shrinkage of the material in the product being manufactured. All this leads to a reduction in the life of the mandrel.

Known mandrel for the manufacture of pipes by the method of continuous winding, containing located symmetrically relative to the axis of rotation of the sector strips, rigidly connected by stiffeners into blocks without bearing on the shaft (RU 2390415 C2, B29C 53/82, publ. 27.05.2010 Bul. No. 15) . However, this design has a complex structure and low reliability, and to ensure the reciprocating movement of each Tritavr formed by the sector strips, a support containing rolling or sliding elements is also necessary.

This mandrel is technically closest to the proposed invention and adopted as a prototype.

The invention was tasked with simplifying the design, increasing the reliability and efficiency of the mandrel, reducing its weight and cost, reducing energy consumption for both the manufacture of the mandrel and the production of products, and increasing the service life.

The technical result of the invention is to simplify the design, increase the reliability and efficiency of the mandrel, reducing its weight, reducing energy consumption as. for the manufacture of the mandrel, and for the production of products, increasing the service life, as well as expanding the arsenal of technical means for the specified purpose.

The technical result is achieved due to the fact that in the mandrel for the manufacture of products made of composite fibrous materials (hereinafter referred to as the mandrel), including sector slides symmetrically with respect to its axis of rotation, sector slides are made inside the hollow shaft and each of them is rigidly connected to its inner surface possibility of reciprocating movement. Sector strips are connected to the inner surface of the hollow shaft by means of elongated bodies, which have elastic properties.

The number of pie bars in the mandrel determines the shape of its cross section, which can be in the form of a geometric figure with different numbers of sides having different sizes.

FIG. 1 conventionally depicted mandrel; in fig. 2 shows section A-A in FIG. one; in fig. 3 - a fragment of a mandrel with a sector strip, section.

The mandrel contains a control unit 1, a hollow shaft 2, sector slats 3 with an elongated body 4.

The mandrel works as follows.

From the drive of the rotational movement of the control unit, 1 sector slats 3 are rotated around the axis of the mandrel. Simultaneously with the rotational movement of the sector strips 3, interacting with the copier of the control unit 1, make a reciprocating motion along the mandrel. Formed during reciprocating sector strips 3 on the working part of the mandrel by applying a fibrous material with a binder and further polymerization, the product moves to the end of the mandrel at a speed determined by the reciprocating drive, and is removed from it for further use as intended.

A method of making a mandrel for manufacturing articles made of composite fibrous materials, including the connection of sector, slats with a shaft, consists in connecting the sector slats with the external surface of the shaft or with its internal surface by connecting each sector slider with the shaft by means of one or several bodies, one side rigidly connected to the shaft, and the other side rigidly connected to the sector bar, with the possibility of reciprocating movement of the sector bars relative but the shaft.

The proposed mandrel for the manufacture of products made of composite fibrous materials and method of making the mandrel eliminate the need to use the characteristic mandrels with the location of the slats on the outer side of the central shaft of the rolling elements or sliding elements in the slides of the slats during the reciprocating movement of them relative to the copier surface and the shaft.

Claims (3)

1. Mandrel for the manufacture of products made of composite fibrous materials, including sector planks located symmetrically with respect to its axis of rotation, characterized in that the sector planks are made inside the hollow shaft and each of them is connected to its inner surface by means of elongated shapes, one side rigidly connected to shaft, and the other side is rigidly connected to the sector strip, with the possibility of reciprocating movement of the sector bars relative to the shaft. 2. Mandrel under item 1, characterized in that the elongated body have elastic properties. 3. The method of forming a mandrel for the manufacture of products made of composite fibrous materials, including the connection of the sector slats with the shaft, characterized in that the connection of the sector slats is carried out with the external surface of the shaft or with its internal surface by connecting each sector slider with the shaft through one or more elongated bodies forms, one side rigidly connected to the shaft, and the other side rigidly connected to the sector strip, with the possibility of reciprocating movement of the sector strut relative to the shaft.

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