What is press piercing?
What is press piercing?
With the crowding method will be solid billet into the larvae into the capillary process. After the perforation of the capillary with the bottom of the cup and the two, as a pipe jacking, rolling pipe rolling pipe and pipe extrusion of the blank.
In the press with the punch (head) to achieve the pressure perforation is crowded deformation, can be divided into open and closed two, as shown in Figure 1. Perforated with billet (some with round billet) or polygonal ingots. If the metal is out of the free space between the cylinder wall and the blank, the perforation is perforated, and if the metal is larger than the free space, it is closed. Polygon ingot perforation, the general start stage for the open perforation, later closed perforation.
(Figure 2), that is, in the center of the bored a ф20 ~ 40mm guide hole, and then push the punch from the guide hole through the hole will be expanded while the hollow blank In the mold in the reverse extension. This method of high yield, perforation is small, capillary wall thickness of high precision, low cost, and can wear a long capillary, but the metal waste.