Planar automatic punching riveting cold extrusion connection process for multilayer dissimilar or same materials

Abstract

The invention relates to a connection process which is particularly suitable for automatically punching, riveting and cold extrusion of a double-layer or multi-layer planar structural member formed byhot-formed section steel or high-strength steel with dissimilar materials of aluminum alloy. A plating layer of parent metal punched and riveted by the connection process does not fall off, a metal material does not change the metal phase structure due to heating, harmful heat is not generated, and harmful smoke or sparks is not generated. The surface of the metal parent metal does not need to becleaned in advance, the surface of the welded parent metal does not need to be treated, the parent metal does not need to be drilled in advance, rivets can be put without the need of adjusting the concentricity of pre-drilled holes, thus the production process is simplified, riveting can be carried out at any position in a riveting area according to the requirements of customers, the tensile strength of the parent metal riveted by adopting the connection process is remarkably improved, the connection process is suitable for riveting the parent metal with the thickness of a single-layer platebeing more than 9 mm and the thickness difference of a double-layer plate being more than 4 times, no corrosion risk exists, and the connection strength between the riveting position and the parent metal is good.

Description

technical field [0001] The invention relates to a planar self-piercing riveting cold extrusion connection process of multi-layer heterogeneous or homogeneous materials. Background technique [0002] Traditionally, the connection of double-layer or multi-layer planes of dissimilar materials such as hot-formed steel or high-strength steel and aluminum alloy is generally performed by welding or rivet connection. The metal structure is changed due to heating, the metal surface needs to be cleaned before welding, the welding process consumes a lot of energy, there is a risk of desoldering during the welding process, and the welding process will generate harmful heat, fireworks or sparks, etc. Complicated and expensive post-welding surface treatment; multi-layer dissimilar plates connected by riveting technology need to be pre-drilled by hand before riveting, and the concentricity of the pre-drilled holes needs to be manually adjusted after drilling. Putting rivets not only leads...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a plane self-piercing riveting cold extrusion connection process of multi-layer dissimilar or homogeneous materials, the coating layer of the parent material that is used for punching riveting cold extrusion will not fall off, and the metal material will not fall off. Change the metal structure due to heating, no harmful heat and no harmful smoke or sparks, no need to pre-clean the surface of the base metal, no need to treat the surface of the base metal after welding, no need to pre-treat the base metal The rivets can only be placed by drilling and concentricity without adjusting the pre-drilled holes, which simplifies the production process, and the tensile strength and shear strength of the base material after punching and cold extrusion have been significantly improved. Automatic punching and riveting of double-layer or multi-layer planar structural parts composed of hot-formed steel plates or high-strength steel plates and aluminum alloy plates. It is also suitable for automatic riveting of planar structural parts composed of ordinary carbon steel plates and all stainless steel plates. Punch riveting is suitable for automatic punching riveting of pre-sprayed plates and electroplated plates, etc. It has strong versatility, and it solves the problem that the double-layer or multi-layer dissimilar plates connected by welding or rivet connection have tensile strength. Poor and shear strength is very weak, the appearance of the plate is affected by the obvious bumps, the riveting area requires a large limit, the riveting material combination requires a large limit, pre-sprayed and pre-connected plates are not applicable, the riveting material thickness combination requires a large limit, The problem that it is impossible to rivet single-layer plates with a thickness greater than 9mm and double-layer plates with a thickness difference of more than 4 times

Images