How A Make A Piston
Enviado por maverickboss • 18 de Febrero de 2014 • 237 Palabras (1 Páginas) • 229 Visitas
Foundry
The foundry is the beginning of the piston. At the foundry the die is prepared by heating it to operating temperature for approximately one hour. This process allows the die to readily accept the molten material when it is poured.
The material
The material used is a 10% silicon content aluminium.
The die
The dies used are 5 piece and three piece. These dies are made from cast iron with steel inserts for the gudgeon pin holes and the cores. The cores dictate the placement of the gudgeon pin and can be located to give offset pins or square pins.
The process
The process starts by heating the material to 700 degrees Celsius. This is well above the melting point of the aluminium, but below its boiling point. The material is then scooped up with a ladle from the crucible (the pot that holds the molten material). This is then poured into the die through the sprue. The material is then allowed to cool before it is removed from the die and placed into a bin of hot water. This water is used to facilitate a more even settling of the hot metal.
After the castings have had time to cool they are placed into a heat treatment plant overnight. This process tempers the casting and ensures the piston will have improved qualities.
After it is removed from the heat treatment the casting has its runner removed.
This process takes little time and is fully automated.
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