Some problems about hollow dies and die corrections 1.Twisting and side bending of square and round tube diesThe causes of torsion and side bending defects of aluminum extrusion profiles are mainly caused by uneven flow velocity caused by uneven metal supply.The picture below is a schematic diagram

Die correction is an important factor in aluminum extrusion processing, there is no 100% perfect die, first pass rate only 60% for the average. Only through die correction, product quality and processing efficiency can be improved continuously.Last time we discussed some die corrections about hollow