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Unformatted text preview: 7) Describe the three major sheet metal forming processes. 8) What is springback in sheet metal bending? What is bend allowance? 9) For the punching process, given that the blanked piece has diameter=10 in, sheet stock thickness=2 in and allowance a=0.1, design the size of punch and die. 10) Describe the wire drawing process. 11) Why should there be a clearance between the punch and die in sheet metal cutting and drawing processes? What is the expression for calculating the clearance in sheet metal cutting and how is it different from the clearance in drawing processes? 12) The following are measures of feasibility for several proposed cup drawing perations; which of the operations are likely to be feasible? (hint: DR drawing ratio, r= (Db-Dp)/Db, please use the guideline about the range of DR and t/D in lecture slides). (a) DR = 2.3, (b) DR = 1.5, (c) r = 0.7, (d) r = 40%, and (e) t/D = 2%....
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- Spring '08