SU1490328A1 - Rivet - Google Patents

Abstract

This invention relates to mechanical engineering, to rivets for assembling with one-sided access of parts made of composite materials. The purpose of the invention is to improve the quality of the rivet joint by eliminating damage to the part being joined from composite material. The rivet contains a sleeve 2, a screw 8, a deformable ring 14 with an insert 18. The sleeve is made with an insertion head and a lead-in section of a radius shape, a screw with a head and a tear-off shank is screwed into it. A deformable ring with an insert is installed on the screw between its head and the sleeve. When screwing in the screw, the deformable ring is squeezed onto the lead-in portion of the sleeve and forms a corrugation. Corrugation does not require much effort. The corrugation interacts with the surface of the composite part being joined, without damaging it, which improves the quality of the riveted joint. 1 hp f-ly, 6 ill.

Description

This invention relates to mechanical engineering, to rivets for assembling with one-sided access of parts made of composite materials.

The purpose of the invention is to improve the quality of the rivet joint by eliminating damage to the part being joined from composite material.

Fig. 1 shows a rivet prior to the formation of a rivet joint; figure 2 - node I in figure 1; FIGS. 3-5 shows a rivet joint assembly sequence; figure 6 rivet connection in the collection.

The rivet for joining the sheets 1 contains the sleeve 2 with the insetting head 3, the threaded hole 4, the cylindrical part 5 and the lead-in portion 6, which is rounded rounded radius R, the cylindrical 5 and the lead portion 6 intersecting along line 7, as well as the screw 8 with thread 9, a head 10, a process shank 11 with flats 12 and a loose neck 13, a deformable ring 14 with a groove 15, a thin-walled 16 and thick 17 parts and a liner 18 with a lead 19 and inner 20 chamfers. The liner is made of a material softer than the sleeve, the screw and the deformable ring.

Rivet works as follows.

A deformable ring 14 with an insert 18 inserted into it is placed on a screw that is screwed into the threaded hole 4 of the sleeve 2. Then the rivet is inserted into the hole of the joined sheets 1 until it stops against the surface of one of them 3 of the sleeve 2 (Fig. 1). In the process of screwing the screw rotation for the flats 12 technological shank 11 Kohl

and

m

49032 -5

if the insert 18 was absent, then the deformable ring 14 would move along the cylindrical part 5 of the sleeve until it touches the interconnectable plate 1. The presence of the liner 18 changes this process: as the deformable ring approaches the bend line 7, the insert locks between the thin bend that started

Q part 16 and the inner end of the thick-walled part 17. Deformable col-. The zo continues to move under the action of the rotating screw, and the locked liner is compressed with increasing thickness, while bending the thin-walled part 16 outward to form a corrugation 21 (Fig. 4). Due to the preliminary deformation of the thin-walled part 16 along the radius R, the formation

20 corrugation 21 does not require high application

loads. With further rotation and movement of the screw-deformable ring. with the formed corrugation 21 moves down along the cylindrical part 5

25 of the sleeve (FIG. 5) up to the stop of the corrugation 21 into the sheet 1 of composite material without damaging its surface. Subsequently, under the action of a screw that continues to move, the corrugation 21 is distributed

30 in the radial direction, as if spreading over the surface of the sheet 1 and forming the closing head of the rivet with a large area of the supporting surface. When the set load of the pack of joined sheets 1 is reached, the technological shank 11 is cut off along the neck 13, after which the assembly is completed (Fig. 6).

The entrance section of the hull is made

dd rounded along the radius R (0.4 - 0.9) d and length 1 (0.18-0.25) d, where d is the diameter of the sleeve.

Execution of the lead-in portion of the sleeve along the radius R (0,., 9) d allows35

14 begins to deform, transfers the pre-de axial load to the insert 18, the formation of the thin-walled part, which thanks to the balance of the lead-in chamfer 19, is easily squeezed onto the entry section 6, securing it, and deforms the thin-walled part 16 of the ring 14, which also takes a curved shape (fig.Z). When approaching the intersection line of the cylindrical 5 and the lead-in 6 parts of the sleeve (to the inflection line), the thin-walled part 16 of the deformable ring 14 changes its direction, tending to bend and further move along the cylindrical part 5 of the sleeve. If a

0

five

The formed ring along the radius R is already in the Initial stage of assembly, so that the formation of a corrugation in the zone of the intersection line of the lead-in and cylindrical part of the sleeve occurs at much lower loads than when the lead-in part is made in the form of a cone. In addition, the one-sided formation of the corrugation due to the beating of the sleeve relative to the thread is eliminated, thereby improving the quality of the formation of the joint, eliminating the possibility of

damage; and joined sheets. When the radius R is made of the value; 0.4d, a gentle section is formed, the elongated end of the body on the side of the inlet part. As a result, the liner and the thin-walled part of the deformable ring are practically supported at the end of the body, and the load required to deform them during the assembly process increases dramatically. Increasing the load leads to a violation of the coating of the contacting parts, uneven (one-sided) formation of the corrugation and deterioration of the quality of the assembly, up to the non-stop rivet.

When performing a radius R of 0.9d, this radius actually turns into a cone, i.e. the effect of using the radius shape of the lead-in area is reduced to zero.

If the length of the lead-in portion of the sleeve 1 is 0.18d from the end of the sleeve, then this section is practically itself transformed into the end of the sleeve. If the specified length is 1 0.25d, then the cylindrical and the inlet parts of the sleeve are practically matched and not intersecting, as a result of which a corrugated element does not form a corrugation and fracture of the surface of the joined sheet from the composite

material edge of the deformable 35 sleeve, and inserts made with a counter lead-in chamfer. 2. Rivet according to claim 1,

th element.

Execution on insertion lead-in

characterized in that the insert is made with an additional chamfer on the side of the screw head.

chamfering allows during the assembly process to ensure a uniform squeezing of the inserts.

five

about

five

0

application of a smaller load and without a partial cut of the part of the liner.

Carrying out a similar additional chamfer at the opposite end of the liner allows you to adjust the volume of the liner material inside the deformable ring. When this volume is exceeded, the excess part of the material is squeezed out of the corrugation of the deformable ring.

Claims (2)

1. A rivet containing a sleeve with a fixed head at one end and a lead-in portion on the other, a screw with a head and a toxic technological shank screwed into the sleeve and placed on the screw between its head and the lead-in portion of the sleeve is a deformable ring, in which The insert is made of a material softer than the material of the sleeve, the screw and the deformable ring, in order to improve the quality of the riveted joint by eliminating damage to the part being joined. positional material, the lead-in portion of the sleeve is made rounded along a radius equal to 0.4-0.9 of the diameter of the sleeve, and a length equal to 0.18-0.25 of the diameter bushings, and the insert is made with a counter lead-in chamfer. 2. Rivet according to claim 1, characterized in that the insert is made with an additional chamfer on the side of the screw head. Phage. five Fig.Z ig.