Copper Terminal Block Manufacturing Process

The copper terminal strip material is made of copper, which has low yield strength and good plasticity.  The part is also axially symmetrical, making it suitable for cold extrusion forming. Cold extrusion of tubular parts is divided into two types: cold extrusion with a mandrel and cold extrusion without a mandrel. Cold extrusion with a mandrel can control the inner diameter of the formed tube, but the mold structure is complex and is mainly used for workpieces requiring constant or reduced wall thickness. In cold extrusion without a mandrel, there is not only axial elongation but also an increase in wall thickness, making it suitable for the production of tubular parts without strict requirements on inner diameter and wall thickness. The coreless cold extrusion mold has no mandrel, resulting in a simple structure, ease of manufacture, easy operation, and high production efficiency. A large cross-sectional reduction rate can be achieved in a single extrusion, minimizing the number of deformation steps. Given that this part does not have strict requirements on inner diameter and wall thickness, the project ultimately chose the coreless cold extrusion process.
The specific process flow is as follows:
The terminal cold extrusion mold uses a combined structure. During operation, the upper mold is first lifted, and then the blank is vertically placed into the lower mold. The upper mold is pressed down, and immediately returns to its original position after pressing. The ejection device then pushes the workpiece out of the lower mold to obtain the finished product, completing one working cycle.