1. Cold partition Features: The gaps that appear when the metal flows with lower temperature butt but are not fused are irregular linear, there are two kinds of penetrating and non-penetrating, and there is a development trend under the action of external force.

1. Cold partition Exclusions: 1. Properly increase the pouring temperature and mold temperature. 2. Change the alloy composition and improve the fluidity.

In 1838, in order to make molds for movable type printing, people invented die-casting equipment.

1. The advantages of die casting include that the casting has excellent dimensional accuracy.2. The biggest disadvantage of die casting is the high cost.

Metals used for die casting mainly include zinc, copper, aluminum, magnesium, lead, tin, and lead-tin alloys, although die cast iron is rare, but feasible.

The problem encountered now is that the aluminum die casting has a lot of oil stains, and the surface is required to be cleaned and whitened.