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How to find shrinkage in sheet metal

Question asked by Jebakumar S on Aug 22, 2013
Latest reply on Aug 27, 2013 by Jebakumar S

hi friends i have attached 4 photos, step by step i will explain what the problem i have,this is the final productCapture4.JPG

this is formed from a sheet metal blank

Capture.JPG

the radius to be maintained is 40 and the diatance from the top surface to the arc's end is 5 mmCapture2.JPG

so this is the blank i have designed,Capture3.JPG

but after forming the press workers reported that the radius to be maintained is reduced from 40 to 19.78, so shrinkage occured during forming process,

how to find the shrinkage factor and what radius i have to put in order to get that 40mm radius after forming process.

help me in this issue.

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