Formula’s for design die

THE basic Before you making ,manufacturing and deign the die. you must know the calculation formula for designing the die.

formula for making ,manufacturing and design the die is:

	Cutting force	F= A x Tß F = Cutting force S = Material thickness L = Total cutting length A = L x S = Shear area Tß = Shear strength Note : Shear strength = 80% of tensile strength
	Stripping force	P= ( L x S x Tß ) / 10 P = Stripping force S = Material thickness L = Total cutting length A = L x S = Shear area Tß = Shear strength
		L = a + ( R + q x s/2 )( Pi x ° / 180) L = Flat blank length a, b = Length of legs R = Bend radius q = Correction factor ( refer to table below ) ° = Bend angle Pi = 3.1416
	Correction factor	Correction factor q Ratio R : s 5.0 3.0 2.0 1.2 0.8 0.5 Correction factor 1.0 0.9 0.8 0.7 0.6 0.5 R = Bend radius S = Material thickness
		E = ( D + s ) 0.707 C = ( D + s ) 1.414 E = Center distance C = Center distance between two apart radii s = Material thickness D = Inside diameter of final formed part R = D/2 ( approximate ) Note : if R = D/2, radii will be tangent, if R /= D/2, radii will require blending.
	Draw clearance	Thickness S 1st Draw 2nd Draw Sizing Draw < 0.4 1.08 S 1.09-1.10 S 1.04-1.05 S 0.4 - 1.27 1.08 - 1.10 S 1.10 - 1.13 S 1.05 - 1.06 S 1.27 - 3.18 1.10 - 1.13 S 1.13 - 1.15 S 1.06 - 1.08 S > 3.175 1.13 - 1.15 S 1.15 - 1.20 S 1.08 - 1.10 S S = Material thickness
	Draw reduction ( number of draw )	H / D No. of draw < 0.75 1 0.7 - 1.5 2 1.5 - 3.0 3 3.0 - 4.7 4 H = Draw piece height D = Mean diameter of draw piece
	Draw % of reduction	% = 1 -( MD / D ) % = percentage of reduction MD = Mean diameter of draw piece D = Flat blank diameter
		A = 0.7854 (( DXD )-(dXd)) D = Flat blank diameter d = Hole diameter
		A = 3.1416 ( D x H ) D = Mean diameter H = Shell height
		A= 4.935 RD + 6.283 (R x R) D = Hole diameter R = Radius ( 1/2 thickness )
		A= 4.935 RD - 6.283 (R x R) D = Outer diameter R = Radius ( 1/2 thickness )
		A= 6.283 ( R x R ) R = Radius ( 1/2 thickness )
		A = 6.283 RH R = Radius ( 1/2 thickness ) H = Shell height
		A = 9.87 RD D = center to center diameter R = Radius ( 1/2 thickness )