### Sand casting stages.
Sand casting is a common method used to create metal parts by pouring molten metal into a sand mold. There are generally four stages involved in sand casting.
#### Stage 1: Pattern making.
The first stage in sand casting is pattern making. In this stage, a pattern of the desired part is created. The pattern is typically made of wood, plastic, or metal and is an exact replica of the part that will be cast. The pattern is used to create the mold cavity in the next stage of the process.
#### Stage 2: Mold preparation.
Once the pattern is made, the next stage is mold preparation. The pattern is placed in a box or flask, and sand is packed around it to create a mold. The sand used in sand casting is typically a mixture of sand, clay, and water. The mold cavity is created by removing the pattern from the sand, leaving behind a negative impression of the part.
#### Stage 3: Pouring.
After the mold is prepared, the next stage is pouring. In this stage, molten metal is poured into the mold cavity. The metal fills the cavity and takes on the shape of the part. It is important to ensure that the metal is poured at the correct temperature and at the correct rate to prevent defects in the final part.
#### Stage 4: Cooling and finishing.
The final stage in sand casting is cooling and finishing. After the metal has been poured, it is allowed to cool and solidify in the mold. Once the metal has cooled, the mold is broken apart, and the casting is removed. The casting may then undergo additional finishing processes, such as grinding or machining, to achieve the desired final shape and surface finish.
In conclusion, the four stages of sand casting are pattern making, mold preparation, pouring, and cooling and finishing. Each stage is critical to the success of the casting process and must be carefully executed to ensure the production of high-quality metal parts.
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