B.O.B. problem in extrusion processing The vast majority of the “ Billet on Billet “ or “ Blok on Blok, “ ( B .O.B. for short ) problems are from the welding seam lines in the hollow profiles and the ends of the profile for very wide flat dies that use a spreader plate to provide sufficient feed to

Introduction to Heat TreatmentThe aluminum extrusion dies use hot steel as the base material. It needs to go through the heat treatment procedure to improve the hardness and toughness to meet the extrusion conditions of high temperature and high pressure.Generally, during heat treatment, in order to