A method for punching an aluminum alloy forging punch structure and

The present invention relates to a punching method and structure for a punch forging an aluminum alloy, the method of the present invention by the first punch, the draft angle design of the second punch is 2 ° ~ 3 °, while the first punch small end chamfer R15 ~ R30, whereby the alloy is subjected to a large deformation during forging, the metal flow resistance decreases, to avoid adhesion problems in the blank on the punch can occur through large fillet, the first by addition the large end of the punch chamfered R2 ~ R5, by reducing the metal flow modification, the metal flow to ensure that the hole is not strained. When the blank is not opened by chamfering the large end diameter than the bulk of the second punch of a first punch end diameter of 20 ~ 30mm, and a second punch large end and the small end of the head, effectively guarantee the punching document bore, without sagging, thus ensuring the quality of the punched hole, the inner hole and piercing the skin does not appear clamp step after punching the blank may direct heat melted material, improve production efficiency, shorten the production cycle to improve the mechanical properties of forgings.