16.18. A press brake bends a cold-rolled steel sheet along a 48-in. dimension. The ultimate tensile strength of the mate

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16 18 A Press Brake Bends A Cold Rolled Steel Sheet Along A 48 In Dimension The Ultimate Tensile Strength Of The Mate 1 (45.75 KiB) Viewed 16 times

16.18. A press brake bends a cold-rolled steel sheet along a 48-in. dimension. The ultimate tensile strength of the material is 95,000 psi and the thickness is 14 in. What is the bending force if the width of the lower die is 1 in.? What is the importance of this number? 16.19. A ½-in. plate is 96 in. by 36 in. and will have a bend in both directions. Each corner is notched to 6 by 6 in. to permit bending of the plate into a boxlike container. The dimension of the U-die is I in. The ultimate tensile strength of the material is 135,000 psi. Find the maximum bend- ing force. 16.20. Find the drawing pressure for a beverage can shown in Figure C16.1. The tensile strength of this grade of alumi- num is 27,500 psi. 16.21. Find the minimum inside radius that usually will apply if a 1-in.-thick plate is being bent into a 90° corner. Also calculate for a 14-in.-thick plate. What is the length of the bend? 16.22. A bending operation works on a 4-in. aluminum plate. The radius of the forming punch is minimum. The corner is 90°. What is the length of the bend? What type of material stresses are in the inside and outside fibers of the material? 16.23. Find the drawing force for the following material and design. Assume a free draw with clearance sufficient to prevent ironing, and a maximum reduction of 50%, a deep draw of steel stock in. thick with a tensile strength of 50,000 psi into a shell 10 in. in diameter. The blank diameter is 12 in. 16.24. Consider the following: Metal having a tenule stress of 40,000 psi, mean diameter of shell 4 in.. blank diameter of 9.5 in., and thickness of Vis in. Find the force applied to the punch. 16.25. What is the maximum area of the blank that can be formed in a 700-ton (6.2-MN) press if the pressure neces- sary to form the material is 14,000 psi (96.5 MPa)?