The formula for calculating the width spread of cylindrical deep-drawn parts is d0 = √√ a/π, which is generally calculated by dividing the deep-drawn parts into three parts. That is, the area of straight cylinder+the area of bottom fillet+the area of bottom circle. The area of a straight cylinder a1= d-h-r-π; Bottom fillet area A2 = [2 π | d-2r |+8r? ] π/4 base circle area a3 =-d-2r? π/4∑a = a 1+a2+a3 d 0 =√a 1+a2+a3 /πd0=√4﹛d﹙h-r﹚π+[2πr﹙d-2r﹚+8r？ ]π/4+﹙d-2r﹚？ π/4/πD0=√﹙d-2r﹚？ +2πr﹙d-2r﹚+8r？ +4d﹙H-r﹚