Self resistance heating flat bottom rivet-free forming device and process of light weight panels

Abstract

The invention relates to a self resistance heating flat bottom rivet-free forming device and process of light weight panels. Before connection is started, a lower mold is fixed, a first mica plate isfixed to the lower mold, upper and lower panels are pressed through edge pressing rings, and a second mica plate is placed below step faces of the edge pressing rings; the connecting process is started, a puncher pin downwards moves to be in contact with the upper panel, a power source is turned on at the same time, and the power source, the puncher pin, the upper panel, the lower panel and the lower mold are connected through wires to form a current loop; and when the temperature of the upper and lower panels reaches the material plastic deformation temperature, the power source is turned off, the puncher pin continuously moves downwards, the puncher pin extrudes the upper and lower panels to enable the upper and lower panels to generate plastic deformation, the puncher pin and the edge pressing rings move upwards after the upper and lower panels completely deform, and the upper and lower panels are taken out. The self resistance heating flat bottom rivet-free forming device and process have the beneficial effects that the forming force is small, the connecting point strength is high, and the connecting quality is reliable.

Description

technical field [0001] The invention belongs to the technical field of plate connection, and in particular relates to a self-resistance heating flat-bottom rivetless connection forming device and process for lightweight plates. Background technique [0002] In recent years, with the widespread use of lightweight panels in vehicles such as automobiles and airplanes, the rivetless joining process suitable for connecting lightweight panels for automobiles has developed rapidly. The rivetless connection process refers to the use of the plastic deformation ability of the plates, and the use of special convex and concave dies to stamp the connected plates, so that the plates are embedded to realize the connection between the plates. Compared with the traditional plate connection method, the rivetless connection process not only has great advantages in terms of economy, energy consumption, and working environment, but also is very suitable for the connection of plates of different ...

AI Technical Summary

Problems solved by technology

This process does not require any auxiliary materials such as rivets during the connection process. It is one of the important methods to realize the connection of lightweight plates such as aluminum alloys. It is of great significance for the lightweight of automobiles, but it inevitably has the following disadvantages: The static strength of the connection point formed by the rivetless connection is low; one side of the connection point is a protrusion, and the other side is a pit, which seriously affects the appearance of the panel connection. At present, an important indicator of the automobile panel connection is its aesthetics. However, due to the existence of protrusions and concave holes in the rivetless connection, the application of this technology is limited to a certain extent, especially when there is relative movement on the surface of the plate; the punch and die of the traditional rivetless connection require strict alignment. Shifting will seriously affect the strength of the connection point

[0003] In order to overcome the shortcomings of the above-mentioned traditional rivetless connection, some scholars have proposed a flat-bottomed rivetless connection process, but this connection method has the following disadvantages: the traditional flat-bottomed rivetless connection has few adjustable parameters and poor adjustability; the traditional flat-bottomed rivetless connection During the riveting process, the material flows upward along the punch, and the friction resistance of the punch to it is large, which is easy to cause damage or even cracks to the internal material; the flow of the traditional flat-bottomed riveted connection is a one-way back-extrusion method, and the resistance is large when flowing. The external load required for forming is large and the forming is difficult;

[0005] So far, no literature reports have been found on the combination of self-resistance heating and flat-bottom rivetless connection

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