Question

4. A blanking operation is performed on 5/32-in-thick cold-rolled steel (half hard). The part is circular with diameter 3.500 in. Determine: a) the appropriate punch and die sizes for this operation. b) the blanking force required, if the shear strength of the steel 40,000 lb/in2.

Answer 1

For the given blanking operation and sheet dimensions, we need to find the appropriate punch and die sizes. In case (b) we need to find the blanking force required corresponding to given shear strength of the steel as follows.

Solu tion en dat a Pe of operation Blanki ng cold-Rolled Steel W04K material Chalf hasd) oiamete D3. 500 Thickness, t 32 と 스 0-15625 m Fot cold Rolted steel Chalf-hasd) cleaJ{ ance Allowance ;s, alue

a) Punch and die Si3es The stefosie, 6.075% ( 2) : lanking punch diameter s D, -C - 3.500 -2 Co85) ·Blanking die diamet-e γ = Db (Ans)

C6) Blanking force equi sed iven that Sheas stength of steel S+0, oo bin whene, L length of cut 10.qq n

'to, 000 x 0-15625 x 10-99 F 68,68.5 lb nswe)

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