Discussion
Spark plug insulators are typically formed by
Answer: B
Correct answer: dry bag isostatic pressing followed by green machining
A spark plug insulator is a long, slender shape with a central bore, which is exactly what isostatic pressing does well and a die does badly. The dry bag arrangement keeps the flexible mould in the machine so that the cycle can be automated to high volume, and the external profile is then turned in the green state before firing.
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