Calculation method of internal die for core wire extrusion

The calculation method of core wire extrusion internal die adopts the following formula.

1, D= 1. 155d+n, where d represents the size of a single wire and n represents the number of wires. In addition, when selecting the external mold, the common mold selection of electronic wires is to determine the specifications of the internal mold according to the stranded outer diameter of copper wire and the gap value of 0.08-0.2. The mold selection of the common outer cover line can be selected according to the specified value of the design card, or it can be enlarged by 0.05. When the core wire is laid, the matching mode of the internal mold is the same as that of extrusion.

2. The theoretical formula for calculating the aperture of the external mold is: A=(Dc2-Dw2)/(D2-Dw2), where: a is the cross-sectional area ratio before and after foaming, usually 2-4. Dc is the finished product diameter, Dw is the core diameter, and d is the hole diameter of the external eye mold.