What are the causes and preventive measures for aluminum alloy burr defects?
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發布日期:2015-01-21
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What are the causes and preventive measures for aluminum alloy burr defects?Aluminum alloy burrs (pocks or metal beans) are irregular enamel-like, point-like scratch defects on the white sur..........
What are the causes and preventive measures for aluminum alloy burr defects?

Aluminum alloy burrs (pocks or metal beans) are irregular enamel-like, point-like scratch defects on the white surface of aluminum alloy products, sometimes called metal beans;

         1 Causes of aluminum alloy burrs

         a Mould work belt is not hard enough or soft and hard, it is easy to stick aluminum, and the working strip of multi-adhesive drill scratches the metal;

         b The temperature of the extrusion tube and the metal is too high, and the extrusion speed is too fast or uneven;

         c The mold working belt is too long and the finish is not enough;

         e The extrusion ingredients are too long;

         2 measures to prevent aluminum alloy burrs

         a Ingot. Strengthen the melt filtration; reduce the impurity content in the alloy, use the car skin bar as much as possible; fully homogenize;

         b mold. The working belt should not be too wide, the nitriding layer should be stable, the hardness should be sufficient and uniform; the working belt outlet should be sharp; the working belt should not be too small; the mold working with the sticky metal should be polished in time.

         c Squeeze. Reasonably reduce the extrusion temperature and pressurization speed; increase the pressure; clean the oxide of the liner of the extrusion cylinder in time; uniformly heat the ingot, protect the mold working zone by nitrogen (to prevent oxidation), and cool the mold;

Article source: www.bombgroup17.com

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