RU2063875C1 - Gear for manufacture of rigid tubes from composite material - Google Patents

Abstract

FIELD: civil engineering. SUBSTANCE: invention refers to manufacture of rigid tubes from composite material by application-lay-out of prepreg on to rotary mandrel. Mobile means of fastening of prepreg on slider with axial hole where rod with collar is put resting against butt of body of mandrel is spring-loaded with reference to sleeve joined to slider by means of thread which is fixed on it with locking unit via check washer. Slider and sleeve has means preventing their turn at moment of creation of prepreg. EFFECT: facilitated manufacture of rigid tubes. 2 dwg

Description

 The invention relates to equipment for the production of rigid high-strength cylindrical pipes (rods) of polymer composite materials such as carbon, glass, organoplastics with predominant reinforcement along the axis of the pipe, obtained by laying-winding prepreg on a rotating mandrel, which can be used to create various engineering structures as well as sports equipment.

 Known devices for the manufacture of rigid pipes for a composite material by the lay-winding method, including the release mechanism, mandrel, lay-winding means.

 The known device does not provide voltage reinforcement along the axis of the product, which does not allow to obtain high strength characteristics of the products.

 It is also known a device for manufacturing rigid pipes made of composite material, comprising a mandrel body and means for attaching a prepreg at its ends, one of which is installed with the possibility of movement along the axis.

 The known device does not provide loading reinforcement with calibrated force. To solve this problem, in a device for manufacturing rigid pipes made of composite material containing a mandrel body and means for fastening the prepreg at its ends, one of which is installed with the possibility of moving along the axis according to the invention, a movable fastening means of the prepreg is fixed on a slider with an axial hole, in which has a stock with a shoulder, abutting against the end of the mandrel body, spring-loaded relative to the cup connected to the slide by means of a thread, fixed on it with a locking assembly through h a control washer, and the slider and the glass have means to keep them from turning at the moment of creating the tension of the prepreg.

 The invention is illustrated in the drawings. Figure 1 shows a General view of the device (longitudinal section); figure 2 shows the cross section of the mandrel.

 The device consists of a mandrel 1, fixed in the equipment with the possibility of rotation. On the mandrel 1 there are liners 2. On one side of the mandrel there is a device 3 for fixing the prepreg 4 with a predominantly longitudinal arrangement of reinforcing threads, and on the other hand a guide pin 5. The guide pin 5 interacts with the mechanism for creating and controlling the preliminary tension 6, being coaxially inside him. The mechanism for creating and controlling the preliminary tension 6 is made in the form of interconnected through the thread of the slide 7 and the glass 8. The slide 7 is provided on one side with a device 9 for fixing the prepreg 4. The glass 8 is made in the form of a hollow cylinder, inside of which are coaxially arranged with it an elastic element 10 and a rod 11 with a collar 12. The rod 11 with a collar 12 interacts with an elastic element 10 located between the collar of the rod and the bottom of the glass 8. At one end of the rod 11 there is a locking assembly 13, and on the other end interacts with the guide m finger 5 of the mandrel 1 from inside of the slider 7, coaxially with it. The rod 11 is equipped with protrusions 14, interacting with the glass 8 and excluding its rotation at the time of tension. A control washer 15 is located between the locking assembly 13 and the end of the cup 8. The slider 7 and the cup 8 are equipped with devices 16 and 17 for holding them against turning at the moment of tension (for example, flats under the wrench).

 The manufacture of pipes (rods) is as follows.

 Before laying prepreg 4 on the mandrel 1, the mechanism is calibrated to create and control the preliminary tension. For this, the mechanism 6 with the slider 7 removed is placed in the calibration device. To one of the ends of the rod 11 is gradually applied (for example, using a dynamometer or a press) the force necessary to create the tension of the prepreg, which is determined in advance experimentally, which leads to the compression of the elastic element 10 (for example, a spring). After that, the locking assembly 13 is checked (for example, by means of a thread on the rod 11 and two nuts) so that when the specified force appears on the rod 11, it becomes possible to displace (rotate) the control washer 15. The mechanism is unloaded to create and control pre-tensioning, and then re-control loading. At a given amount of force, the control washer 15 should turn by hand. During the calibration process, unloading and control loading are performed several times until stable results are obtained.

 Then, inserts 2 are mounted on the mandrel 1. A slider 7 is mounted on the guide pin 5 of the mandrel 1 and laid out (wound) on the mandrel 1 and the slider 7 of the prepreg with a predominantly longitudinal arrangement of reinforcing fibers. With the help of the fixture for fixing the prepreg 3 and 9, the prepreg is fixed on the mandrel 1 and the slider 7. Then, holding the slider 7 from turning for the fixture 16, the glass 8 for the fixture 17 is screwed onto the slider 7. In this case, the rod 11, resting against the finger 5 produces tension of the prepreg 4. The moment of reaching a predetermined force is fixed as far as possible displacement (or rotation) of the control washer 15. Then the prepreg is compacted using one of the known methods (for example, wickel, pressing) and the entire set of the device is placed tsya to the polymerization oven to cure the binder. After completion of the polymerization process, the kit is removed from the furnace. The finished pipe (rod) is trimmed according to the liners 2. The liners 2 are made of easily processed material (for example, fluoroplastic). The finished pipe, after dismantling the mechanism to create and control the tension, is removed from the mandrel. Residues of the cured prepreg from the prepreg fixtures are removed mechanically or burned out. After replacing the liners 2, the manufacturing process of pipes (rods) can be repeated. In the case of a transition to a new standard size of pipes (rods) or another type of material, it is necessary to retune the mechanism to create and control the preliminary tension.

 Thus, this device allows in the process of binder polymerization to provide a state of tension, reinforcing fibers, which leads to straightening of the fibers and, as a result, to an increase in the level of physicomechanical properties of the composite material and ensuring stability of the properties. Increasing the elastic and strength properties of the pipe material leads to higher quality, lower weight and cost of products.

Claims (1)

 A device for manufacturing rigid pipes made of composite material, comprising a mandrel body and means for attaching the prepreg at its ends, one of which is mounted to move along the axis, characterized in that the movable means for attaching the prepreg is mounted on a slider with an axial hole in which the rod is mounted with a collar, abutting against the end of the mandrel body, spring-loaded relative to the cup connected to the slider by means of a thread, fixed on it by a locking assembly through a control washer, m slide glass and have means to keep them from turning at the time the prepreg tension.

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