A blind rivet nut molding method, device and blind rivet nut with process for Ev automotive structural design manufacturing process industrial solutions

EV Automotive Manufacturing Blind Rivet Nuts are a commonly used connector to achieve a strong connection between the add-on and the substrate material. A blind rivet nut is a connector with internal threads, usually made of steel. It is similar to a hole, with a conical end and an axial aperture perpendicular to the end. It is mainly used for connecting workpieces with holes and is suitable for steel plates, aluminum plates, and alloys. A blind rivet nut is a nut that is fastened and associated with the connected parts by blind riveting form, which is now widely used in the assembly of electromechanical and light industrial products such as automobiles, aviation, instruments, furniture, decoration, and so on. To solve the technical metal sheet, thin tube welding nut easy to melt, tapping the internal thread easy to slip teeth and other shortcomings of the development, it does not need to tap the internal thread, do not need to weld the nut, riveted firmly and efficiently, easy to use. To meet the demand of new energy vehicles for different models of the battery box, due to the battery box on the closed end of the blind rivet nut installation, anti-rotation torque requirements are high.

In the existing cold heading process technology, in the sixth mold station using upsetting flange and molding bar process, the flange diameter upsetting, height upsetting short, need the fifth mold and the sixth mold two stations processing diameter in place of the flange and get the molding bar is not full defective, the metal in the molding according to the principle of least resistance, the metal material will be the first to the edge of the flange flow, resulting in the flow of the bar of the material is less, the molding bar is not complete, resulting in the molding bar can not meet the requirements of use. This results in the molding bar not meeting the requirements of use. The closed-end blind rivet nut production process is as follows.

1. The wire is cut to form a preset blank, and the preset blank is shaped;

2. molding the upper part of the preset blank with a preset head set point;

3. a first bore and a rod flower tooth are counter-extruded within the preset head through said head fixing point, thereby realizing the first bore molding;

4. counter-extruding a second bore within the lower portion of the pre-determined blank, thereby molding a second bore;

5. finishing the diameter of said head flange and the first chamfer where said rod portion meets said head flange to form the head flange;

6. pre-determined blanks being formed into a plurality of molded ribs by plastic deformation of the material to form a pre-determined blind rivet nut having a plurality of molded ribs;

7 The pre-determined blind rivet nut having molded ribs is heat treated, tapped, plated with zinc-nickel alloy neutral salt spray for 720 hours, environmentally friendly colored zinc neutral salt spray for 196 hours, and coated with adhesive to obtain a finished blind rivet nut.www.juxinfasteners.com