Electroplastic self-piercing riveting device

Abstract

The invention relates to an electroplastic self-piercing riveting device belonging to the technical field of automobile manufacture. The device comprises a driving rod, a blank holder, a plurality of spring bead positioning mechanisms, four electric brushes in two groups, semitubular rivets and a female die, wherein the blank holder, a plate to be connected and the female die are sequentially arranged from top to bottom; the driving rod is sleeved in the blank holder; the plurality of spring bead positioning mechanisms are horizontally distributed in the blank holder along the radial direction; the semitubular rivets are vertically arranged in the blank holder and are in contact with the spring bead positioning mechanisms; the driving rod, the blank holder, the semitubular rivets and the female die are coaxially arranged; two upper electric brushes are respectively arranged at the bottom of the blank holder; and two lower electric brushes are oppositely arranged at the top of the female die. The invention solves the problem that when an alloy plate is riveted, the bottom of a joint generates radial cracks easily and even generates brittle rupture; and the invention reduces the plastic deformation resistance when the advanced high strength steel is riveted, and improves the comprehensive connection quality of joints.

Description

technical field [0001] The invention relates to a device in the technical field of automobile manufacturing, in particular to an electroplastic self-piercing riveting device. Background technique [0002] With the development of the automobile industry, the environmental protection performance and fuel economy of vehicles have increasingly become the main aspects of fierce competition among major automobile manufacturers. The above competition directly promotes the development of lightweight automobile bodies. Lightweight alloy materials such as magnesium and aluminum are gradually used in the manufacture of body structures due to their low density and high specific strength; at the same time, advanced high-strength steel has excellent comprehensive mechanical properties, and it will still occupy a place in future body manufacturing. Resistance spot welding is the most important connection method in traditional steel automobile body assembly. However, for the connection of l...

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Problems solved by technology

[0005] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides an electroplastic self-piercing riveting device, which increases the ductility of brittle light alloy materials such as cast aluminum and magnesium alloys by introducing the electroplastic effect of metal materials, and solves the problem It solves the problem that radial cracks or even brittle cracks are likely to occur at the bottom of the joint when the above-mentioned alloy plates are riveted; at the same time, this effect is used to reduce the plastic deformation resistance when riveting advanced high-strength steel. capacity and the rigidity of the C-frame of the riveting gun, which reduces the production cost. On the other hand, it improves the formability of the joint when riveting advanced high-strength steel plates, and improves the comprehensive connection quality of the joint.

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