Causes and elimination of tearing cracks on the surface of aluminum profiles

Disadvantages of nominal cracks in aluminum profiles: nominally, the aluminum profiles show longitudinal fish-like repetitive interval breaks, and the major ones are directly broken. The most widely used non-ferrous metal structural material in the aluminum alloy profile industry is in aviation, aerospace, automobile, machinery manufacturing, shipbuilding, construction, and decoration. Causes of nominal cracks in aluminum profiles: (1) Extrusion coefficient of aluminum profile is too large, the extrusion temperature is too high (three temperatures of rod, barrel, and die), and the extrusion speed is too fast; (2) The extrusion force is unstable and suddenly High and low, or the speed difference between multiple speed adjustments is obvious, and the speed changes suddenly when shifting; (3) The head end is pressed (punching) too fast when the aluminum alloy profile is extruded, and the tail end runs or does not slow down A large amount of aluminum was soaked in the dead zone; (4) The quality of the rod was poor, the rod was overburnt, and the grains were large and fluffy. The pressure surplus (V3 aluminum) is too thin; (5) The flow rate ratio of the extrusion die is large and the design and manufacture are unfair. The most widely used non-ferrous metal structural material in the aluminum alloy profile industry is in aviation, aerospace, automobile, machinery manufacturing, shipbuilding, construction, and decoration. Nominal crack elimination methods for aluminum profiles: (1) Profiles with excessive extrusion coefficients may be produced on a small machine, with a suitable extrusion ratio; in addition, the three extrusion temperatures must be strictly controlled in accordance with the requirements of the production process, and appropriate extrusion must be adopted. Pressure speed; (2) The operator is concentrated, the speed is stable, the pressure cannot be higher or lower, and the manual operation is coordinated when shifting gears; (3) The front and back ends of the aluminum profile stop printing are the death zone or V3 volume (aluminum rod surface layer) ) Aluminum has many impurities, poor quality and insufficient viscosity, so the extrusion speed of the profile head and tail ends should be slowed down; %); (5) Extrusion die designers should design and manufacture qualified die with uniform flow rate. The most widely used non-ferrous metal structural material in the aluminum alloy profile industry is in aviation, aerospace, automobile, machinery manufacturing, shipbuilding, construction, and decoration.
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