137-7598-9989（Niu）
(1): the extrusion coefficient of aluminum profile is too large, the extrusion temperature is too high (bar, tube, die three temperature), the extrusion speed is too fast.
(2): the extrusion pressure is unstable, suddenly high and suddenly low, or the speed difference between multi-speed regulation is obvious, the speed conversion is fast when changing gears.
(3): aluminum alloy profile extrusion head end pressure (stamping) too fast, tail end running speed or not decelerated, a lot of infiltration of the dead zone of aluminum.
(4) the quality of the rod is poor, the rod is over-burned, with large grains and loose. Residual pressure (V3 aluminum) is too thin.
(5): extrusion die velocity ratio serious imbalance unreasonable design and manufacturing.
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