A flat-bottomed rivetless vibration connection forming device and process for lightweight plates

Abstract

A flat-bottomed rivetless connection forming device and process for lightweight plates. The device combines vibration assistance and flat-bottomed rivetless connection. Before the connection starts, the lower mold is fixed, and the vibrator is fixed on the lower mold. The upper surface is flat and smooth, and the upper and lower sheets are stacked on the upper surface of the vibrator, and the upper and lower sheets are pressed by the steps of the stepped blank holder; when the connection process starts, the punch moves downward and touches the upper sheet, At the same time, the vibrator starts to work, exerting axial vibration on the upper and lower sheets, the punch continues to move downward, and the punch squeezes the upper and lower sheets to deform the upper and lower sheets, Embedding is generated to form a mechanical lock, so that the two sheets are connected together. After the upper and lower sheets are completely formed, the vibrator stops working, and the punch and stepped blankholder move upward to take out the upper and lower sheets. , the invention has the advantages of reliable connection quality, high connection strength and small forming force.

Description

technical field [0001] The invention belongs to the technical field of plate connection, and in particular relates to a flat-bottom rivetless vibration connection forming device and process for lightweight plates. Background technique [0002] In recent years, the rivetless connection process that can be applied to connect automobile plates has been developed rapidly. The rivetless connection process uses a special convex and concave die to stamp the connecting plates, and uses the plastic deformation ability of the metal to achieve the connection through the embedding between the plates. Purpose. Compared with the traditional connection method, in addition to having great advantages in terms of economy, energy saving, and environmental protection, it is also very suitable for the connection of heterogeneous and heterogeneous materials with coatings or paints on the surface. The rivetless connection process is a new process that can realize the connection without any auxili...

AI Technical Summary

Problems solved by technology

However, the rivetless plastic connection method of lightweight plates has the following disadvantages: the static strength of the rivetless connection point is low; the rivetless connection will produce a high protrusion on one side of the plate, which seriously affects the quality of the plate connection At present, an important indicator of the connection of automobile panels is its aesthetics, and the application of rivetless connections on automobile panels is limited due to the existence of raised points; since the protrusions at the connection points will hinder movement, rivetless connections are also It is not suitable for applications where there is relative movement on the surface of the plate; the upper mold and the lower mold of the traditional rivetless connection need to be strictly centered, and once the deviation occurs, the connection strength will be seriously affected

[0003] In order to overcome the shortcomings of the traditional rivetless connection, in recent years some people have proposed a flat-bottomed rivetless connection process, but this traditional flat-bottomed rivetless connection method has the following disadvantages: The traditional flat-bottomed rivetless connection process has poor adjustability , there are few parameters that can be adjusted, and the parameters of the formed connection point are relatively simple; the material of the traditional flat bottom rivetless connection 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 traditional flat bottom without rivet The flow of the riveted connection is a one-way reverse extrusion method, the resistance is large during the flow, the external load required for forming is large, and the forming is difficult; the shape of the blank holder for the traditional flat bottom connection is mainly a V-shaped blank holder and a rounded blank holder ring, the resistance during flow is large, and the forming force required by the blank holder ring is large during blank pressing

[0005] No literature reports have been found on the combination of vibration assistance and flat-bottom rivetless joints

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