RU2055736C1 - Mandrel for making articles of composite material - Google Patents

Abstract

FIELD: chemical engineering. SUBSTANCE: mandrel has central shaft in the shape of semiaxes rigidly connected with cylindrical shell. The spherical member represents cylinder-spherical built-in article of nozzle block pressed from the inside by conical-spherical blocking member from one side and cylinder-spherical blocking member pressing from the outside the built-in article-ring frame support from the other side. In this case spherical fastening members are fixed on semiaxes by flat wedges. Cylindrical shell from the side of conical-spherical blocking member of fastening is made composing of cylinder-conical equidistantly disposed rings forming in longitudinal cross-section saw-tooth profiles oriented towards cylinder-spherical blocking member. Series-alternating saw-tooth concentric profiles oriented in the direction from mandrel axis towards composing cylinder-conical equidistantly located rings are made on face cylindrical part of semiaxis. The forming surfaces of mandrel and of fastening members have chromium cover and are polished off. Cylindrical shell has slope towards conical-spherical blocking member. Besides, the mandrel is made two-place with symmetrical disposition of one-place mandrels having a common cylindrical shell. EFFECT: enhanced efficiency of plastic reprocessing. 1 cl, 3 dwg

Description

 The invention relates to equipment for the processing of plastics by winding.

 Known mandrel for the manufacture of fiberglass products, consisting of a collapsible cylindrical shell and end hemispheres, mounted on the Central shaft using spacers, and the spacers are equipped with ends with spherical heads, one of which is movable and spring-loaded, entering spherical recesses located on central shaft and cylindrical shell.

 However, this design of the mandrel is difficult to manufacture and has limited use, since it can be used for winding cylindrical pipes and cylindrical spherical containers with pole holes, and in addition, when disassembling, the components of the mandrel falling inside the case can damage the inner shell of the product.

 Also known is a mandrel for manufacturing products from composite material, comprising a housing consisting of a cylindrical shell and composite end elements, and a central shaft formed by half shafts on which end elements carrying the cylindrical shell are rigidly fixed.

 The known mandrel does not allow to produce complex layered products having embedded elements such as a frame or other shape, which reduces its technological capabilities.

 To solve this problem, in a mandrel for the manufacture of products from a composite material containing a housing consisting of a cylindrical shell and composite end elements, and a central shaft formed by half shafts on which end elements supporting the cylindrical shell according to the invention are end-fixed, end elements from one the end of the housing are installed with the possibility of pressing against the cylindrical shell of the embedded parts of the product such as a frame, and a number of concentric mounted on the other end of the cylindrical shell rings forming a sawtooth profile at the end for installing embedded parts of a sealing device of a similar shape on which a cylindrical spherical embedded part is mounted, pressed against the axle shaft by means of a conical-spherical element with a cylindrical shaft bearing a flange.

 In addition, the end elements are fixed on the axles by means of wedges.

 In FIG. 1 shows a section through a mandrel; figure 2 is a view along arrow A in figure 1; figure 3 dual mandrel.

 The mandrel includes a cylindrical shell 1, half shafts 2, 3, cylinder-spherical embedded part of the nozzle block 4, conical-spherical locking element 5, cylinder-spherical locking element 6, embedded part-frame 7, flat wedge 8, cylindrical equidistant rings 9, sawtooth profiles 10, the end cylindrical part of the axle shaft 11, sawtooth concentric profiles 12, embedded parts of the sealing device 13, rocket engine housing 14, flange 15, bolts 16, half-clamps 17, landing zones for stabilizer the torus 18, a cylindrical shank 19.

 The mandrel is assembled on a special welding wall in the following sequence.

 First, one side of the mandrel is assembled by passing the embedded part-frame 7 through the half-axis 3, putting it on the cylindrical shell 1 of the mandrel, and is pressed from the outside along the axis of the mandrel with a cylinder-spherical locking element 6, then proceed with the assembly of the opposite side of the mandrel. In the formed equidistant cylindrical rings 9, sawtooth profiles 10 and in the profiles 12 on the end cylindrical part 11 of the axle shaft 2, embedded parts 13 of the sealing device are installed, on which an adhesive layer polymerizing only when heated is applied from the outside, and then installed on the shell 1 of the mandrel cylinder-spherical embedded part of the nozzle block 4, having previously degreased it, which is locked along the nozzle socket with a conical-spherical element 5, on a cylindrical shaft 19 which The flange 15 is installed.

 Spherical locking elements 5 and 6 are fixed on the half shafts with flat wedges 8 from moving along the axis of the mandrel and to select gaps, for which the groove on the half shaft is also made wedge and slightly wider than the wedge itself, after which the mandrel is considered assembled. After the mandrel is assembled, the heat-protective coating and the engine body itself are wound, and the seats 18 are wound under the stabilizer block, for which two half-clamps 17 are installed on the nozzle block from the outside, the inner surface of which copies the wound nozzle block. Adjust the correct installation of the half-clamps along the mandrel axis with bolts 16 mounted on the flange 15, before heat treatment, the crude wound motor housing 14 is cut in place of the connector “B” on the frame 7, releasing the cylindrical-spherical locking element 5, which is removed from the mandrel, after which the mandrel is transferred for heat treatment.

 Dismantling the mandrel with the finished body is as follows.

 Flat wedges 8 are knocked out, half-clamps 17 are removed, then flange 15 is removed with bolts 8. The finished case 14 is separated (cut) at the place of connector “B” on the spherical part of the conical-spherical locking element and pulled from the mandrel. The finished engine housing is sent for machining and control operations. Parts and elements of the mandrel are cleaned of residual resin, lubricated with release grease, assembled according to the above scheme, and the mandrel is sent to the winding machine for reuse.

 To increase labor productivity, reduce the cost of production and based on the availability of special equipment, it is advisable to use a double mandrel (figure 3) with a symmetrical arrangement of single mandrels, having a common cylindrical shell. This mandrel differs from a single mandrel in that it does not have a cylindrical-spherical locking element 6, and the frames 7 are mounted on one common cylindrical shell 2 from opposite sides. Further assembly and winding of a double mandrel is carried out similarly as described above. After winding the engine housings and heat treatment, the mandrel is disassembled, for which purpose the body is cut in the place of connectors "B" and "C". Next, disassembly and preparation for the next winding is carried out similarly as described above.

 The design of this mandrel allows you to get one or two products of complex shape simultaneously with embedded elements by the method of winding composite material.

Claims (2)

 1. A mandrel for the manufacture of articles from composite material, comprising a housing consisting of a cylindrical shell and composite end elements, and a central shaft formed by half shafts, on which end elements supporting the cylindrical shell are rigidly fixed, characterized in that the end elements from one end of the housing mounted with the possibility of pressing against the cylindrical shell of the embedded part of the product of the type of frame, and at the other end of the cylindrical shell there are a number of concentric rings forming on the torus e sawtooth profile for the installation of a sealing device similar form embedded parts on which is mounted tsilindrosfericheskaya embedded plate is pressed against the semi-axis by a conical-spherical member having a cylindrical shank bearing flange.  2. The mandrel according to claim 1, characterized in that the end elements are fixed on the axles by means of wedges.

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