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Extension of holding time of casting under the punch leads to more strength of the castings.

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in Casting-Forming-Welding I by (687k points)
Extension of holding time of casting under the punch leads to more strength of the castings.

(a) True

(b) False

I had been asked this question during an online interview.

My doubt is from Squeeze Casting topic in portion Special Casting Techniques of Casting-Forming-Welding I

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The correct choice is (b) False

For explanation: Extended holding time never makes the castings of good strength; even it may cause wall cracking and problems with punch withdrawal due to thermal contraction of the casting. So a rule is set in the squeeze casting that the maximum holding time is about one second per mm of section thickness.

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