11.03 ₪ 16,6 Vo 4G Vo 4G K/S Edit ☐ ☐ ☐ ☐ UTS Mata Kuliah : Proses Produksi 1 Dosen Pengampu: I Gusti Agung Ketut Chatur Adhi Wirya Aryadi ST., MT. Soal : 60 49 Х 1. A billet 75 mm long and 25 mm in diameter is to be extruded in a direct extrusion operation with extrusion ratio rx = 4.0. The extrudate has a round cross section. The die angle (half-angle) = 90°. The work metal has a strength coefficient = 415 MPa, and strain-hardening exponent = 0.18. Use the Johnson formula with a = 0.8 and b = 1.5 to estimate extrusion. 2. A cylindrical workpiece is subjected to a cold upset forging operation. The starting piece is 75 mm in height and 50 mm in diameter. It is reduced in the operation to a height of 36 mm. The work material has a flow curve defined by K-350MPa and n = 0.17. Assume a coefficient of friction of 0.1. Determine the force as the process begins, at intermediate heights of 62 mm, 49 mm, and at the final height of 36 mm. 3. A round disk of 150-mm diameter is to be blanked from a strip of 3.2-mm, half-hard cold-rolled steel whose shear strength = 310 MPa. Determine (a) the appropriate punch and die diameters, and (b) blanking force. 4. A sheet-metal blank is to be bent as shown in Figure 20.15. The metal has a modulus of elasticity = 205 (103) MPa, yield strength = 275 MPa, and tensile strength = 450 MPa. Determine (a) the starting blank size and (b) the bending force if a V-die is used with a die opening dimension = 25 mm. Answer all that question Jumlah Kata: 1414 ☑ Alat Tampilan Mobile Bagi Edit di PC WPS AI