When we use the aluminum material, we will find a lot of material on the surface will produce vertical fish-like repeat the interval of broken lines, serious directly off the separation. These cracks will seriously affect the performance of aluminum, which led to the causes of such defects and related measures, the following Shanghai excellent industrial aluminum for everyone to make the following detailed explanation.
Aluminum surface cracks cause:
(A): aluminum extrusion factor is too large, the extrusion temperature is too high (rod, tube, mold three temperature), extrusion speed and then too fast.
(B): squeeze instability, high and low, or multi-speed speed difference between the obvious speed, shift speed conversion quickly.
(C): aluminum alloy extrusion when the head pressure (stamping) too fast, the end of the run speed or no deceleration, a large number of infiltration of dead aluminum.
(D): poor quality of the rod, the rod over the burning, large grain, loose. The pressure (V3 aluminum) is too thin.
(5): extrusion die flow rate than the serious design and manufacturing unreasonable.