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Double-action pressing improves density uniformity by

  • A.vibrating the powder thoroughly before it is pressed
  • B.moving both punches so pressure enters from both ends
  • C.using a very much higher pressure than is usual
  • D.heating the whole die during the pressing stroke

Answer: B

Each punch has to drive pressure only half the depth, so the gradient is halved and the weak plane moves to the middle. It remains a compromise rather than a cure, which is why isostatic pressing exists for demanding work.

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