RU87657U1 - PLANE FLOOR ACCESSORIES - Google Patents

Abstract

1. Equipment for the floor beam of the airframe of the aircraft, including a mandrel with a rubber-like tread placed on it with intersecting grooves, characterized in that the mandrel is made in the form of two hollow pipes made with an inner surface in the form of a truncated cone, strained in tension by a long hairpin, with flanges installed at the ends of the pipes, equipped with reverse studs and a collapsible tread of closed section made of rubber-like elastic material. ! 2. Equipment for the floor beam of an airplane glider according to claim 1, characterized in that the end face of the flanges adjacent to the mandrel is provided with a rectangular groove in the external office for cutting workpieces. ! 3. Equipment for the floor beam of the airframe according to claim 1, characterized in that the flanges are made with a cavity and equipped with eyebolts.

Description

Technical field

The device relates to technological processes, to the molding of plastics, shaping them by winding and joining, and more specifically, to equipment for the manufacture of supporting floor beams of the aircraft.

The utility model can be used in aircraft, space technology, shipbuilding and automotive industries, for the manufacture of shell casings in order to increase their strength characteristics and reduce the weight of the structure.

The prior art.

A device for the manufacture of ribs from composite materials according to the patent of the Russian Federation 2116934 C1, B64C 3/18 class, 1997. A device for manufacturing a flat rib-mesh structure of ribs from composite materials, made in the form of a base with a flat surface and mounted on it with technological pins and a yarn layer. A device for manufacturing a flat rib-mesh structure is provided with a flat frame shape with an open system of intersecting rectilinear channels for forming straight ribs of a flat rib-mesh structure of ribs in them, made in rod-shaped elements, joined and fixed in places from the intersection in the grooves of the corresponding profile of the technological rings, mounted on a flat surface of the base, and the technological pins are installed outside the flat frame shape.

Closest to the proposed invention in technical essence and the achieved effect is a mandrel for the manufacture of pipe-shells of cellular structure from composite materials according to the patent of the Russian Federation 2084343, В29С 53/56, В29С 53/82, В32В 3/12 class, 1997. According to this patent, the mandrel for the manufacture of shell pipes of a cellular structure made of composite materials is made in the form of a core and a rubber-like material covering it with mutually intersecting grooves for laying intersecting spiral, longitudinal and annular ribbons for the formation of stiffening ribs of the shell-pipe frame. Tapes are made of unidirectional threads. The rubber-like material is made of flexible plates with rectilinear mutually intersecting grooves on their outer surface with the formation of blunt protrusions and trihedral nests in the places of the crosshairs curved along the radius of curvature of the core surface and joined along the grooves. The planes of the lateral faces of the blunt protrusions intersect inside the trihedral nests along a common intersection line.

The disadvantage of this invention is that the position of the rubber-like material on the mandrel is not reliable and can be shifted when winding unidirectional tapes. The difficulty is the need to rigidly fix the rubber-like material on the core during the winding process, but at the same time, the proposed fastening option would not create obstacles when removing the mandrel.

In addition, if it is necessary to manufacture a beam of rectangular cross section, ensuring the joint of the grooves causes an increase in the complexity of the process.

The essence of the utility model.

The objective of this utility model is to develop such equipment that would provide a high-quality product: with high precision, good strength characteristics, which would automate the process of obtaining the product.

The problem is solved due to the fact that the equipment for the beam of the airframe glider of a mesh structure made of polymer composite materials includes a mandrel with a rubber-like tread placed on it with mutually intersecting grooves.

A distinctive feature of the utility model is that the mandrel is made in the form of two hollow pipes made with an inner surface in the form of a truncated cone, pulled together in tension by a long hairpin. At the ends, flanges equipped with reverse studs are installed. The pipes are equipped with a composite, collapsible tread of closed section made of rubber-like elastic material. In addition, the end face of the flanges adjacent to the mandrel, on the external office is equipped with a rectangular groove for cutting workpieces. The flanges are made with a cavity and equipped with eyebolts.

This solution to the problem allows you to get high quality products: with high precision, good strength characteristics, and more specifically, a mesh floor beam.

The list of figures in the drawings.

Figure 1 Snap beam floor assembly drawing

Figure 2 A longitudinal section of the snap-beam floor

Fig 3. Presents a node And figure 1

Figure 4. An end face of a floor beam with

mounted flange.

Utility Model Implementation

It is necessary to fabricate a beam of the airframe glider from a PCM containing spiral intersecting prepreg tapes, interconnected by continuous strips of a woven PCM prepreg, laid on top of round turns. The floor beam is made in the form of a hollow closed mesh structure having a cross-section in the form of a rectangular frame with rounded corners. The floor beam is provided with additional longitudinal and transverse ribs associated with spiral ribs. In addition, in places of future installation of connected parts, there are monolithic sections based on a woven fibrous filler.

The equipment for forming the mesh floor beam (Fig. 1, Fig. 2) consists of two equal hollow pipes 1, 2, split tread 3, flanges 4, 5, long studs.

The hollow pipes 1, 2 made of steel have a rectangular cross section identical to the internal section of the net beam of the floor, minus the thickness of the split tread 3. The hollow pipes 1, 2 are mutually oriented due to the pins 7 and the holes 8 (Figure 2) located on the ends of the pipes opposite the flanges.

The tread 3 (figure 1) consists of 6 pads 495 mm long and one pad 135 mm long. The tread is made integral - detachable to facilitate the process of putting on the hollow pipe mandrel and removal of the finished product. The overlays match the pattern at the joints between each other. Compound - split tread made of elastic heat-resistant material, such as silicone rubber. The material for the manufacture of the tread should provide low adhesion to other materials and possess the thermal stability necessary for forming the prepreg of the floor beam according to the passport regimes. The outer surface of the tread 3 is made with a congruent pattern of channels with respect to the pattern of the grid of the floor beam. The inner surface of the tread is smooth. Compound - detachable tread 3 is made with spiral channels 9 and 10, has monolithic sections 11, can have transverse channels 12 and longitudinal channels 13. (Fig. 3) The tread 3 is made similar to the outer section of the hollow pipes 1, 2 with the possibility of longitudinal sliding of the tread on their surface.

The ends of the pipes 1, 2 are provided with flanges 4, 5 (Fig. 4) by means of a bolted connection 14. The flanges have a cavity 17 for allowing the passage of a long stud 6 with a thread at the ends for pipe ties when assembling the equipment into a single mandrel. The flange has pins 15, for clamping in the cartridges of the winding machine. Also, the flanges are equipped with ten studs 16 (figure 4) to ensure the fixation of the harnesses during the winding process, due to which a given pattern of the floor beam mesh is obtained. The lengths of the studs 16 should be sufficient to accommodate the required amount of tow. The diameter of the studs and their location is selected in such a way as to ensure accurate laying of the prepreg tape along a given trajectory of the pattern. The cavity of the flanges 4, 5 is threaded to enable placement of the eyebolt necessary to remove the tread 3 with the part from the mandrel. The end face of the flanges 4, 5 adjacent to the pipe is provided with a groove 19 to facilitate trimming the ends of the workpiece floor beams.

Two hollow pipes of complex inner cross-section 1, 2 with a composite protector 3 detachable and flanges 4, 5 are connected by tightening them, in a prestressed state, with a long stud 6, by tightening the nuts 18 at the ends of the long stud. T.O. a mandrel is formed for winding the prepreg.

The device works as follows: flanges 3, 4 are mounted on pipes 1, 2 by means of a bolt connection 14. Hollow pipes 1, 2 are put on a long stud 6 with threads at the ends, while orienting them relative to each other using pins 7 and holes 8 located at the ends of the pipes opposite the flange. Next, they fasten the pipes by tightening the nuts 18 at the ends of the long studs located in the pipe cavity, thereby obtaining a single mandrel in a prestressed state. Release grease is applied to the surface of the mandrel and 7 elements of a compound - detachable tread are put on, after which the equipment is placed in the winding machine, clamping in the pins of the winding machine. In a winding machine, floor beams are wound in layers with a unidirectional prepreg tape for ribs and a fabric prepreg tape for monolithic sections. The floor beams are wound using reverse studs 16: during the winding of each coil when it is turned (reversed) in the opposite direction, the prepreg tape engages for the reverse studs, which prevent the prepreg from slipping. Thus, the presence of reverse studs 16 allows you to reverse the prepreg tape without full coverage of the end face of the mandrel, which increases the utilization of the material. After the operation is complete, the windings of the floor beams are placed in a vacuum bag (in the case of molding in an autoclave) or lavsan tapes are wound along geodesic lines (for molding in an oven).

Winding is carried out on a winding machine type NMKE 442129.003.

Next, the workpiece undergoes a molding operation in a furnace or autoclave under the influence of the necessary conditions for curing the binder.

At the end of the molding process, rigging with a floor beam is cooled at room temperature. Technological allowances are removed from the ends of the mandrel by trimming them in the groove zone 19. The long stud 6 is dismantled and removed from the mandrel cavity 17. The eyebolts are screwed into the cavity of the flanges. Using devices such as a hydraulic cylinder, the force necessary to connect the hollow pipes and remove one of them from the tread is applied to the eyebolts. The second part of the pipe is removed from the tread with the beam blank by pushing it from the surface of the pipe using a special device. They release the product from the tread by pushing it inside the floor beam, pressing on the tread, after which the tread is removed from the cavity of the product.

Thanks to the above-described snap-in, it is possible to manufacture a long-sized mesh floor beam of rectangular cross-section of high quality with high strength characteristics. In addition, the above design allows you to automate the winding process, which in turn reduces the complexity of the product and its cost.

Claims (3)

1. Equipment for the floor beam of the airframe of the aircraft, including a mandrel with a rubber-like tread placed on it with intersecting grooves, characterized in that the mandrel is made in the form of two hollow pipes made with an inner surface in the form of a truncated cone, strained in tension by a long hairpin, with flanges installed at the ends of the pipes, equipped with reverse studs and a collapsible tread of closed section made of rubber-like elastic material. 2. Equipment for the floor beam of an airplane glider according to claim 1, characterized in that the end face of the flanges adjacent to the mandrel is provided with a rectangular groove in the external office for cutting workpieces. 3. The accessories for the floor beam of the airframe according to claim 1, characterized in that the flanges are made with a cavity and equipped with eyebolts.