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Which among the following casting process is used in the casting of the piston?

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in Automotive Engine Design by (137k points)
Which among the following casting process is used in the casting of the piston?

(a) Investment casting

(b) Low-pressure casting

(c) Sand casting

(d) Gravity die casting

This question was posed to me in homework.

Asked question is from Engine Components in portion Basic Engine Components of Automotive Engine Design

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Correct option is (d) Gravity die casting

For explanation I would say: Pistons are either cast or forged. Castings are made by gravity die-cast process using 5-piece inner dies, a two-piece outer and usually ahead chill which can form anycast valve pockets and bowls. Core pins are used to form pinholes.

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