Knowledge of precision casting

H2. 1.Holding time

The length of holding time depends on the precision casting material and wall thickness.For castings with high melting point, high crystallization temperature range and thick wall, the holding time is longer.For the casting of small and thin wall of crystallization temperature, the holding time can be shorter.If the holding time is insufficient, it is easy to cause shrinkage. However, the holding time is too long, and it can not get very large effect, and it is easy to cause the residual material difficulty of the vertical die-casting machine.

H3. 2.Open mould time

After holding pressure, the mould should be opened to remove precision casting products.The time from the end of the injection to the casting die is called the opening time. Enough opening time can make the precision casting in the mold to have certain strength, the mold and the ejection will not produce deformation or crack.If the die time is too short, then the casting strength is low, and the casting is easy to deform.

H4. 3.Fill in time

The time required for the liquid metal to enter the cavity in the die casting cavity is called the filling time. The length of filling time depends on the size and complexity of the precision casting.

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