SU1567808A1 - Bolt-rivet - Google Patents

Abstract

This invention relates to mechanical engineering, to rivets for hermetic joints. The purpose of the invention is to increase the reliability of sealing the rivet joint. The bolt-rivet consists of a ring with an annular recess at the end and a rod with a fixed head 3, a smooth section 4, a section 5 with annular ribs, a neck and a tear-off technological shank. The ring is mounted on the annular ribs of the rod. Sealing means 6 in the form of microcapsules of sealant, covered with a protective film, is applied in the annular recess of the ring, under the inset head of the rod and on its annular ribs. When the rod is pulled into the hole of connected parts and when the ring is pressed on it, the sealant microcapsules are destroyed. The sealant fills all the gaps and creates a sealed rivet joint without the use of intra seam and surface sealing. 3 il.

Description

2

31567808

Article 6 in the form of microcapsules of sealant, covered with a protective film, is applied in the annular recess of the ring, under the inset head of the rod and on its annular ribs. When the rod is pulled into the hole of connected parts and when the ring is pressed on it, the sealant microcapsules are destroyed. The sealant fills all gaps and creates a hermetic riveted joint without the use of intra-seam and surface sealing. 3 il.

The invention relates to machinery, in particular to rivets for 15 hermetic joints.

The purpose of the invention is to increase the reliability of sealing a rivet joint.

Figure 1 shows a ring with an annular notch filled with sealant microcapsules; in Figure 2, a rivet bolt with sealant microcapsules applied to it in fig. 3 is a hermetic rivet joint. 25

The rivet bolt consists of a ring 1 with an annular end groove 2 filled with sealant microcapsules and a rod with a fixed head 3, including a smooth section 4, a middle section with knurled circular ribs 5, a neck and a tear-off technological shank 7. Under the fixed head and In the recess between the annular ribs, microcapsules of sealant 8 are applied on the middle portion of the rod. The sealant microcapsules are covered with a protective film.

The rivet bolt is inserted into the hole, a Q-press is placed on the shank, and the stem of the rivet bolt is drawn into the hole. Then a ring 1 is installed on the bolt-rivet rod, then the ring is compressed and the shank 7 is broken along the neck-45 of kek 6.

After the bolt-rivet is pulled into the hole, the microcapsule sealant located under the insetting head is destroyed. During compression of the Qc ring, microcapsules are disrupted, located in the middle portion of the rod and in the annular recess at the ring end.

The force acting on the ring during compression is equal to the pull-off force of the tail of the P. Rick. Under the action of force P, the annular protrusions (flanges) begin to deform. To deform the annular protrusions to a height equal to or less than the diameter of the microcapsules (this is necessary to destroy the microcapsules), it is necessary that the value be equal to the area of the annular protrusions S. after deformation multiplied by the tensile strength of the material of the ring 6 was equal to the force P:

P vb

(D

The area of the annular projections on the deformation 8 dd is equal to the sum of the areas of the external and internal annular projections.

yu S BHew + 5inner D2 fi4D-21) 7

BHCIU

 (Di-i);

Ш ± Ш1 Д1 Hdi + iV,

° internal 44

S frtDl-l HfiXdl + lVfKd + D),

(2)

where D is the outer diameter of the ring; j d is the internal diameter of the ring; 1 - the thickness of the annular shoulder of the ring.

The volume of the annular protrusions is found from the ratio

VK 84D h

where h is the depth of the annular notch, mm. Substituting from the formula (2) we get:

. VK 7Tlh (d + D).

(3)

Taking into account that during deformation the volume of annular protrusions remains unchanged, the area of annular protrusions after deformation is found

HELL

  lh (d + D)

 M-k

where dm K is the diameter of microcapsules, mm.

Substituting the value of S. in the formula (1) we get:

R

 (u + Vl6i d.

It is necessary that the annotations during the upsetting should not lose stability. The annular protrusion can be represented as a short thin-walled cylinder with supported edges, loaded with axial force. Critical buckling voltages are calculated using the formula

. 0A9Ek 1 h

while limiting

h

b-i -;

P-d

U1-K

1Fl (d-fD) 6:

AT

Solving inequalities get

one

Pd

l (D + d) Yo, 9EK6j

After the bolt-rivets are installed, the microcapsules located under the insetting head, in the middle section of the rod and in the annular recess in the ring end, collapse, the sealant fills the gaps between the package and the rivet bolt, creating a tight joint.

This solution will allow you to create a sealed bolt-rivet connection by applying microcapsules of sealant under the embedded head, on the middle portion of the rod in the recesses between the annular projections and in the annular recess made in the ring end face, which is in contact with the package.

67808

where 1 is the annular wall thickness

collar, mm;

h is the depth of the annular recess, MMi d is the internal diameter of the ring, mm; ЕК - material elastic modulus

rings, kg / mm1.

The critical stresses must exceed the strength of the material JQ of the ring 6cr J 6,.

Substituting into the inequality of the values of bh-, get

- 15 K, with h, 1.22 Jfi. (five)

The depth of the annular recess h should not be less than the diameter of the microcapsules: h d m. (6)

Using relation (4), we derive a relationship between 1 and h

h

P d,

fl (d + D) 6

about

The thickness of the collar is limited by the relations (5) and (6)

h - P l (d + D) ne

TO

tf (d + D) 6

Using a rivet bolt to seal the seams will not allow

make the internal and surface sealing of the seam with polysulfide sealants, which will reduce the mass of the structure, improve working conditions by eliminating the use of toxic substances in the production, as well as reduce the complexity of assembly work.

Claims (1)

Invention Formula A bolt-rivet containing a rod, a ring and a sealing agent, wherein the rod is made with a mortgage head at one end and end workings and a detachable technological shank at the other end, and the ring is mounted on annular ribs of the rod, characterized in that increasing the reliability of sealing the rivet joint-i, on the end of the ring facing the inset head of the rod, an annular recess is made, the sealing means is in the form of sealant microcapsules covered with a protective film and EHO in said annular recess of the ring under the mortgage HT1 L.EAA one RF1. 6 (d + Dir) V) V (6Ј) T (077443) 5; Sug h is the depth of the annular notch, mm, 1 - thickness of annular flanges formed by an annular recess at the ring end, mmh 20 6j - ultimate strength of the ring material, kg / mmg; d u „- diameter used microm, to 1 dexterous rod and on its annular ribs, while the depth of the annular recess of the ring is equal to P-d m.k. 6 to T (D + d) - 1 eight provided that one RF1.  V (6Ј) T (077443) sealant capsules, mm; outer diameter of the ring, mm; inner diameter of the ring, mm; elastic modulus of the ring material, kg / mm5; i shank breakout force, kg eight FIG. 3