SU935198A1 - Apparatus for riveting - Google Patents

Description

(54) DEVICE FOR ROOFING

one

The invention relates to riveting and assembly work, in particular to devices for riveting mainly wedge-shaped bags made of various materials, including fragile materials, for example composite materials.

A known riveting device comprising upper and lower mandrels in contact with spherical supporting surfaces with strikers, wherein the upper mandrel with the striker is placed in a glass spring loaded with a force spring relative to the mandrel, and the package is pressed as a spherical segment covering the striker upper mandrel contacting with a spherical saddle glass 1.

However, the known device does not provide high-quality riveting, since the package is compressed by an elastic element that springs the cup, which does not provide a constant amount of compression force of the bag during the rivet riveting, since this force depends on the stroke of the mandrel relative to the glass and varies linearly with zero value (at the initial moment of the mutual displacement of the mandrel and the glass) to the maximum (at the end of the riveting process). Therefore, the compressive force, depending on the spring stiffness, may be either insufficient at the initial moment of riveting,

5 which results in incomplete compression of the package and rivet material flowing between the layers of the riveted package, or excessive at the final moment of riveting of the rivet, which leads to damage to the riveted product, especially packages containing parts made of fragile materials, for example composite, as in this case stress to see in these elements may exceed the allowable.

The aim of the invention is to provide riveting packages of parts made of brittle materials and to improve the quality of riveting.

This goal is achieved due to the fact that the device for riveting, containing upper and lower mandrels in contact with spherical bearing surfaces with strikers, while the upper mandrel with striker is placed in a glass, spring-loaded with a force spring relative to the mandrel, and the package is pressed in the form

The spherical segment, which grips the head of the upper mandrel in contact with the spherical seat of the cup, is equipped with a clip, which is rigidly fixed on the upper mandrel, and includes an additional power spring of lesser rigidity, which is installed coaxially in the sleeve and can interact with the main force spring through an annular partition placed in the holder with the ability to move in the area of the additional power spring, while the latter is pre-compressed with a force equal to the force of about compressing the main power spring.

The drawing shows the structure of a riveting device.

The riveting device contains upper and lower mandrels 1 and 2 in contact with spherical bearing surfaces with strikers 3 and 4. The upper mandrel 1 with striker 3 is placed in cup 5, in contact with a spherical slot with a spherical segment — a bag 6 is clamped; in the package clamp and is connected with the mandrel 1 by the spring 7. On the mandrel 1, a holder 8 is rigidly fixed, covering the cup 5 with the mandrel 1. At the same time the cup 5 is spring-loaded relative to the mandrel 1 placed in the holder coaxially with one another and the spring of greater rigidity and d additionally the power spring 10 mensche stiffness, separated by an annular partition and mounted in a holder with a movable abutment to the cage in the zone of the springs 10 with the lower rigidity, which in the initial position is compressed with a force equal to the full force of the compression spring 9, the main power.

The device works as follows.

The mandrels 1 and 2 are fixed in the plunger of the press 12 and 13. The riveted package of 14 parts with the rivet 15 installed in its opening is placed on the firing pin 4. The upper mandrel is moved down by the plunger of the press 12. When the package 6 is pressed against the surface of the riveted package 14, it self-aligns with its end on the plane of the latter, compressing it with force springs 9 and 10. At the same time, force spring 9 is pressed to become more rigid until it is fully compressed, and then additional force spring 10 is pressed down. .

Simultaneously with the compression of the power spring 10, the striker 3 deforms the rivet 15.

The use of the proposed device provides an increase in the quality of riveting and a reduction in scrap by 70%, compared with the use of known devices for this.

According to a preliminary calculation, the annual economic efficiency from the use of the proposed technical solution at one enterprise of the industry is 40 thousand rubles.

Claims (1)

Invention Formula A riveting device containing upper and lower mandrels in contact with spherical bearing surfaces with strikers, while the upper mandrel with striker is placed in a glass spring loaded with a force spring relative to the mandrel, as well as a package in the form of a spherical segment that contacts the striker of the upper mandrel in contact with the spherical a saddle cup, characterized in that, in order to secure the riveting of a package of parts made of brittle materials and improve the quality of the riveting, it is provided with a covering glass with a power spring of my rigidly attached to the upper mandrel and the additional power spring stiffness mensche mounted coaxially in a cage and engageable with the main spring force through an annular partition disposed in the holder to be movable in the zone of the additional force of the spring, thus. the latter is pre-compressed with a force equal to the force of full compression of the main power spring. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 433948, cl. B 21 J 15/32, 1.973 (prototype). 12