SU1215821A1 - Method of rivetting - Google Patents

Description

FIELD OF THE INVENTION The invention relates to mechanical assembly production, in particular to riveting works in aircraft and rocket production.

The purpose of the invention is to improve the quality of the rivet joint by adjusting the magnitude and direction of the deformation in the zones of the embedded and closing heads with the help of local pressing with movable crimping and supporting the rivet in two stages.

1 shows the assembled package with a rivet having a conical head to riveting; figure 2 - riveted connection after riveting with a force (0.7-1.0) P, from the required upsetting force; Fig. 3 shows a riveted connection with a deformed inset and closing head after application of increased pressure (1.1-1.3) P; figure 4 - rivet connection after riveting; Fig. 3 shows a device for carrying out the method in static and dynamic positions; figure 6 is an assembled package of parts with a rivet having a secret head of the type of memory and a rivet connection after riveting; 7 - the same, with a rivet type ZUK and rivet connection after riveting; fig.Z - the same, with a rivet type ZUKK and rivet connection after riveting; figure 9 is the same, with a rivet type SOUND and rivet connection after riveting; in fig. 10 - the same, with a stud rivet and a rivet joint after riveting; figure 11 - assembled connection with a rivet type ultrasonic and rivet connection after riveting; on Fig - form protrusions on the movable snap.

The method of connecting the package of parts with a rivet is that the rivet 1 with a conical or other shape of the insertion head (Fig. 1) is installed into the hole of the riveted parts 2 and 3. Then the package is compressed with the upper die 4 and the lower support 5 and the rivet is riveted in two steps : on the first, the closure head is preliminarily formed with a force of 0.7-1.0 of the required precipitation force P {, and at the second stage, the profiles of the mortgage and closure heads are finally formed by increased pressure

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P (1, 1-1, 3) Pgj, (FIG. 3) to obtain the desired values of tension on the package height.

The data values of the effort of precipitation

determined experimentally for different types. rivet (ZUK, UZ, ZUKK, ZP), the lower value of the preliminary forming force of 0.7 R corresponds to an increased pressure

Ijl p in the second stage, and the forcing force 1.0 corresponds to an increased pressure of 1, 3 P. As a result, the required ratio of tension values is achieved

package height depending on various thicknesses and package material.

The method is implemented on a device comprising an upper crimp 4 and a lower support 5, which are made

in the form of prefabricated glasses, having in the bottom part profiled sockets 6 and 7, movable rods 8 and 9, fixed on 10 and 11, for example, on a shaft with the possibility of axial adjustment movement. The shape of the sockets corresponds to the fixed and closing heads of the rivet, and the lateral surface of the sockets has a cone-hocTb by 10-20. more taper

heads of rivets.

The movable rods 8 and 9 at the ends are limited by projections 12 and 13 of spherical or any other shape. The sliders 10 and 11 rest on elastic liners 14 and 15, the initial compressive force of which is chosen (0.7-1.0 P), and the rods 8 and 9 are passed through the holes in the elastic inserts 14 and 15 and the bottom of the glasses. The slider 10 is fixed by an annular spring 16.

After the rivet I is installed into the hole of the package of parts and the centering of the rod of the rivet 6, nests 6 and 7 are commanded to riveting, the clamp 17c of the support 5 fixed on it moves and compresses the parts of package 2 and 3.

Next, plunger 18 begins to move, which presses on the slider 11 with a movable rod 9, which in turn, will act on the rivet rod, forms a closing head. The stroke of the rolling rod 9 limits the elastic liner 15, having an initial compressive force (0.7-1.0) P from the required upsetting force, which

corresponds to the initial compressive force of the elastic liner 14 and the crimping 4. When the riveting force reaches above the specified initial compressive force in the elastic liners 14 and 15, directional deformation of the rivet and clamping rivet heads begins by inserting movable rods 8 and 9 into the body of the heads of the rivet. The magnitude of this deformation is determined by the shape of the protrusions at the end of the rods and the magnitude of the working stroke Sj and 8j of the elastic incl. Of the breaths 14 and 15, as a result of which the required tension is obtained in a riveted joint along the height chum, which is achieved by changing the shape of the protrusions on the movable rods, the position of the rod relative to the slide and the initial compression force of the elastic liners.

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Experimental verification of the proposed method as compared to the known method shows that its use reduces the required upsetting forces by 1.5-1.6 times 5 to achieve similar stress values in a rivet joint, reducing the deviation rate of a riveted aggregate contour from a theoretically specified about 4-5 times, which allows to increase the aerodynamic quality by 7-10%. The application of the proposed method of riveting in mass production significantly

15 improves the aerodynamic quality of the outer surface of the aircraft, which gives a great economic effect from reducing fuel consumption, increasing commercial load and increasing cruising flight speed.

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Claims (1)

METHOD OF RIVET, consisting in the fact that the rivet is installed in the hole of the packet of riveted parts, the packet is compressed, and then the rivet's closing head is formed by deforming the open and closing heads by tearing, characterized in that, in order to improve the quality of the rivet connection, the formation of a closing the heads are carried out in two stages: at the first stage, the closing head of the rivet is preliminarily formed with a force of 0.7-1.0 of the necessary upsetting force, and at the second stage, they form the final profile abutting the rivet head, while forming head moving mortgage profile tools acting on zaschego end of its rod with a force greater than the force required precipitation, providing uniform strength and mortgage zakmykayuschuyu heads Wuxi Liem constituting 1.1-1.3 by optionally walk force precipitation. Fi, g. 1 P = (l, 1-1, 3) P _th (fig.Z) to obtain the desired preload values by vy1