Step 1--Pattern making
Pattern is a physical model for us to make aluminum sand
castings, we could make pattern in wood, metal material. Wood
pattern is more suitable for large parts with small quantity. If
the product is small with high accuracy, then we suggest metal
pattern for longer working life. If the inside structure of
aluminum sand casting is hollow, expect the basic pattern, we
still need to make a steel mold for sand core.
Step 2--Filling in sand
To form the cavity, we will fill sand in the both sides of
pattern fully and press the sand with a tool so that it is
filled tightly enough. After taking away the middle wood
pattern, we could see the cavity formed.
Step 3--Sprue gate
Sprue gate is the channel where we will pour aluminum alloy
liquid into the cavity. Using a bar to drill two small round
holes and exhaust vent in different places.
Pouring is the key step to make aluminum sand castings. Before
pouring, we need to melt the aluminum alloy bars into liquid in
melting furnace under high temperature. Then pour the aluminum
liquid into the mold.
After pouring, cooling the pattern for a while and take the
solid aluminum sand casting directly from the pattern, then you
will see blanks formed.
Cut the sprue from aluminum sand casting blanks to get finished
aluminum sand castings.
Step 7--Post treatment
Post treatments for aluminum sand casting like heat treatment,
machining, surface treatment (painting, powder coating, ect) and
package for delivery.
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