2016年3月3日星期四

The flow mark of aluminum die casting

    Characteristics: on the casting surface has with the molten metal flow direction consistent stripe. Stripe and metal matrix color is not the same and no direction, no development trend.
    How does the flow mark of aluminum die casting be formed?
    First, the molten metal into the cavity to form a very thin and incomplete metal layer, afterwards comes in the molten metal to make up for it and formed flow mark; mold temperature is too low and uneven; the ingate sectional area is too small and improper location result liquid metal spray; the pressure on the liquid metal is insufficient; coating dosage is too much.
    Processing method:
    Improve the temperature of a molten metal to 620 ~ 650 °C; improve the aluminum die casting mold temperature, maintained at a temperature of 200 ~ 250 °C; increase the ingate sectional area and change the inlet position; adjustment of the filling velocity and injection time and the length of the flow channel; selection suitable coating and adjust dosage.

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