How to deal with hard bend defects in extruded aluminum alloy products? Hard bend: A defect of uneven dead bends occurring along the length direction of aluminum alloy products. 1. Causes of hard bend in extruded aluminum profile products (1) Sudden change in extrusion speed or intermediate parking; (2) The operator suddenly moves the aluminum profile by hand during the extrusion process; (3) Uneven surface on the working table of the extruder. 2. Methods to eliminate hard bend in extruded aluminum profile products (1) Do not stop randomly or suddenly change the extrusion speed; (2) Do not suddenly move the aluminum profile by hand.