Analysis of Die Casting Die for Zinc Alloy Die Casting Factory

Release time: 2013-06-21

Analysis of Die Casting Die for Zinc Alloy Die Casting Factory
Die casting die bonding is also expressed by welding in some places, which means that the die casting alloy sticks to the die casting die, causing physical and chemical reactions. Once the die-casting alloy reacts with the die-casting die, it will form aluminum iron compounds, which will also cause defects to the die-casting parts when stuck to the die, and the hard intermetallic phase will also accumulate on the die surface. Therefore, production must be interrupted and the welding products must be removed by polishing, which will lead to the extension of production time, waste of labor, and reduce the life of the die.
1. It occurs at the entrance or ingate of the mold surface towards the cavity.
These areas are generally subject to the violent impact of molten metal flow during mold filling. The surface temperature is high, the pressure is high, and the protective layer is very easy to be damaged. Under the constant scouring of the die casting alloy, the protective layer of the mold fails and the metal matrix is exposed, and the alloy reacts with the matrix material to generate complex intermetallic compound phases.
2. The position is facing away from the gate or away from the gate.
These areas are usually inaccessible to surface treatment or mold lubricant. Therefore, their surface state, temperature distribution and pressure condition are different from those of other places.
Generally, the temperature of die casting alloy is low after reaching these areas, and its fluidity is also poor, and it is easy to solidify. The contact time between the hot semi-solid alloy and the mold surface is longer. In addition, the mold surface state is not very ideal, so it is easy to form FeAl intermetallic compounds. During multiple die casting cycles, intermetallic compounds will gradually deposit in these areas with poor fluidity, forming serious welding, which affects die casting production.
The amount of intermetallic compounds is very small, the welding surface layer is extremely thin and the analysis method is limited. At the present stage, researchers at home and abroad can only make a qualitative analysis of it roughly. For the formation and development of intermetallic compounds, quantitative analysis will be the focus of future research.

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