SU1412846A1 - Method of connecting blanks - Google Patents

Abstract

Imaging is a fusion (metal processing pressure m. And can be used in mechanical engineering for joining thin-walled blanks, mainly sheet material. The purpose of the invention is to improve the static and fatigue strength of the joints of thin-walled thin-walled joints. The blanks are brought closer to contact one 1. a s. then the holes in the blanks with the next and the first are taken out are fine, the rivet is set into the hole with the flanged parts and riveted. After the installation} the rivets are made together The bottom draft is flanged by iiijix parts of the billet, ensuring the radial flow of the material from the periphery to the center. 5 Il.

Description

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The invention relates to the processing of metals by pressure and can be used in mechanical engineering for joining thin-walled workpieces, preferably sheet material.

The purpose of the invention is to increase the static and fatigue strength of the connection of thin-walled sheet blanks.

FIG. 1 shows thin-walled sheet blanks that are brought together before contact with one another; in fig. 2 - billet with a hole; in fig. 3 - billet after flanging the hole with a rivet installed with a fixed head; in fig. 4 - preliminary connection of the workpieces after precipitation with the application of force through the mortgage head; in fig. 5 - final connection of the blanks after the closure of the closing head.

The method is as follows.

Thin-walled workpieces 1 and 2 bring together close contact with one another. A through hole is made in workpieces with a diameter less than the diameter of the rivet rod, after which the blanks are made in the hole area in one direction, for example, using a punch (not shown) to form a bead 3. After this, workpieces 1 and 2 are set , for example on the plate 4 and pressed to it by the clamp 5, the latter having an inner hole equal to the outer size of the flanged part 3.

On the side of the flanged part 3, a rivet b is installed in the hole, having a rod 7 and a mortgage head 8, before the latter contacts the end surface of the flanged part 3 of workpieces 1 and 2. After the rod 7 is installed, the punch 9 with the application of force through the mortgage head 8 carries out a joint draft flanged parts of workpieces 1 and 2 over the course of the material from the periphery to the center. Since the flanged part 3 has freedom of movement only inward, as the precipitation decreases, the height of the flanged part decreases and the material is radially flowed from the periphery to the unsupported inner surface of the flanged part, i.e., to the center. At the same time, the radial flow velocity of the material is variable in the height of the flange 3.

The material in the middle part of the flanging has the highest speed. As a result of this, the workpiece 1 is inserted into the workpiece 2 in the flanging zone with the production of a permanent mechanical connection of the workpieces. As the flanged part 3 precipitates, the gap between the core 7 of the rivet 6 and the screening 3 is filled with the flanging material. The process of precipitation of the flanged part ends with the creation in the zone of a hole of compressive residual stresses, the size of which

adjust the flanging height 3 and the initial gap between the rod 7 and the internal flanging diameter 3

As a result of the precipitation (Fig. 3), a preliminary permanent connection of the blanks 1 and 2 and a tight connection of the blanks to the rod 7 takes place. In this case, the laying head 8 is aligned with the outer surface of the blank 1. The final connection of the blanks is made by

0 riveting rivet 6, for example, on a riveting press (not shown) with the formation of a closing head (Fig. 5). Use of a rivet with a secret head is possible. In this case, after

2 flanging the end surface of the flanged part, it is desirable to handle at the desired angle of taper.

In the process of joining the workpieces with heating, heaters, such as heating elements, can be used. The process is carried out in this case in a similar way.

Example. The method was tested by joining sheet blanks with a thickness of 3 mm of aluminum alloy MAGBM. The diameter of the rivet shank is 6 mm. The contacting surfaces of the blanks are degreased at the junction, after which they are pressed tightly against one another, a hole is drilled with a diameter of 5 mm and flanged. The inner diameter of the flange is 7 mm. After precipitating the flanged part and forming a locking head, the connection of two sheet blanks with increased mechanical strength is obtained.

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The proposed method of joining the blanks allows increasing the static and fatigue strength of the joints by creating residual compressive stresses B of the jointed blanks in the hole area.

Claims (1)

Invention Formula The method of joining the blanks, which consists in bringing the blanks closer to contact with each other, making a through hole in the blanks, installing a rivet B and forming a rivet closing head, characterized in that in order to increase the static and fatigue strength of the joint thin-walled sheet blanks, the hole in the blanks is made with a diameter less than the diameter of the core of the plug, the blanks in the hole zone are flanged in one direction, while the rivet is installed on the side of the flanged parts, and before the closing head is formed, the edge of the flanged parts of the blanks are made by a force applied from the side rivet heads. At ///////// // A  / /////////////////// Y: one 5 // 7 //////////// 77. /