Calculate the percent cold reduction after cold rolling 0.050-in.-thick stainless steel sheet to 0.029 in.
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Calculate the percent cold reduction after cold rolling 0.050-in.-thick stainless steel sheet to 0.029 in.
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- ddA compression test is performed on a 2” diameter by 5” long bar of an unknown metal. At the end of the compression test, the bar has a height of 3.5 inches. The strength coefficient (K) and the work hardening coefficient (n ) are 250 MPa and 0.4, respectively. State all assumptions needed to work the problem. a) Calculate the final diameter of the bar in inches. b) Calculate the flow stress in MPa when the length of the bar is 4”.Low carbon steel plate that is 1.65 inches thick is to be rolled down to 1.3 inches in a single pass. The plate gets 4% wider as the thickness gets smaller. The steel plate has a 174 MPa yield strength and a 290 MPa tensile strength. The plate enters at a pace of 0.6 inches per minute. The rotating speed is 49.0 rev/min, and the roll radius is 12.8 inches. Calculate: a) Determine the minimum required coefficient of friction that would make this rolling operation possible b) exit velocity of the plate (m/min) c) forward slip (m/min) Please submit the final answers in 2 decimal places
- A round disk of 200-mm diameter is blanked from a strip of 3.0-mm, half-hard cold-rolled steel whose shear strength = 300 MPa, and clearance allowance = 0.075. Determine a. the appropriate punch and die diameters, and b. blanking force Equation to use Clearance allowance value for three sheet metal groups. Compiled from [3]. Metal Group Ac 0.045 1100S and 5052S aluminum alloys, all tempers. 2024ST and 6061ST aluminum alloys; brass, all tempers; soft cold-rolled steel, soft stainless steel. 0.060 Cold-rolled steel, half hard; stainless steel, half-hard and full-hard. 0.0751. A component is designed to be hot forged in an impression die. The projected area of the product is 5800 mm2. During the forging process flashing is formed so that the area including the flash will be 8900 mm2. The part geometry is considered to be simple and the heated work material yields at 92 MPa. Calculate the maximum force required to perform the operation. 2. What are the advantages and disadvantages to forge a product through the open forging process, rather than to machine it from the same material?Question 5 5.1 Calculate the final bend radius for a 3 mm thick 6061 T6 aluminum plate that is formed using a forming punch with an 8 mm radius, as shown in Figure 3. R 8 Figure 3: Bend profile that is formed using a V-block die and a punch with a 8 mm radius 5.2 Explain why there would be a difference between the initial and final bend radius during the bending process and how this occurrence depends upon material properties, sheet thickness and the bend radius.
- As James orbits, he slams into a space elevator, peals himself off, and gets in. On the way down, he thinks about how much strain his legs (0.3m long) can take. If he has a mass of 45kg, and a diameter of 3cm what is the strain on each leg? Assume compact bone.Question 7 A component is designed to be hot forged in an impression die. The projected area of the product is 5800 mm?. During the forging process flashing is formed so that the area including the flash will be 8900 mm?. The part geometry is considered to be simple and the heated work material yields at 92 MPa. Calculate the maximum force required to perform the operation. 7.1 7.2 What are the advantages and disadvantages to forge a product through the open forging process, rather than to machine it from the same material?A compound die will be used to blank and punch a large rectangle (90x150mm blank dimensions) out of 6061ST aluminum alloy sheet stock 3.5 mm thick. The diameter of inside hole is 25 mm. The aluminum sheet metal has a tensile strength 310 MPa. Determine the minimum tonnage press (force) to perform the blanking and punching operation (1) assume that blanking and punching occur simultaneously and (2) assume that punching occurs first, then blanking, Take: Ac-0.06
- 3) A direct extrusion process is used to reduce a cylindrical part that has a diameter of 5 inch and is 10 inch long to a cylinder with 2 inch diameter. The die angle is 90°. The cylinder material has a strength coefficient of 10 ksi and strain hardening exponent Of 0.15. Determine a. Extrusion strain b. Ram forceQuestion-2 If it takes 12.0 min to 50% recrystallize a piece of high-purity copper sheet at 140°C and 200 min at 88°C, how many minutes are required to recrystallize the sheet 50% percent at 100°C? Assume an Arrhenius-type rate behavior.An austenitic stainless steel plate with a width of 100 mm, a length of 150 mm and a thickness of 50 mm is to be hot forged in a hydraulic press so that the width remains constant. If it is to be reduced in one step to a thickness of 40 mm, calculatea) the actual load that needs to be applied at the end of the forging, as well as b) the corresponding deformation energy. In previous plane strain compression tests, it was found that the material exhibits an average plane strain yield stress of 80 MPa at the forging temperature. Assume that the efficiency of the process is 0.6 Answer: Pfr= 2.5 MN ; WTr= 25 kJ
