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4. Rolling. A series of cold rolling operations is to be used to reduce the thickness...
Q3. ( 25 points) A rolling mill used to reduce a sheet strip by 3 mm...
Q3. ( 25 points) A rolling mill used to reduce a sheet strip by 3 mm in thickness. The sheet has 2.5 cm thickness and 30 cm in width. The rolling speed is 0.83 rev/sec. The sheet material flow stress is given by a = 275€0.15. A compression test was conducted to find the coefficient of friction and revealed that the coefficient of friction is 0.12. Check if the friction is adequate for the rolling operation. If it is calculate...
A strip 300 mm wide and 25 mm thick is rolled to a final thickness of...
A strip 300 mm wide and 25 mm thick is rolled to a final thickness of 21 mm with ∅500 mm rolls running at 60 RPM. K = 275 MPa and n=0.2. Using two passes of draft = 2 mm (i.e. t1=23 mm and t2=21 mm) , the class found that the rolling forces were 936 and 1220 kN respectively, and that the power requirement was 171 kW (based on the 2nd pass). It is hypothesized that since the flow...
A U-channel of 85-15 brass will be shape formed, but first must be flat rolled to...
A U-channel of 85-15 brass will be shape formed, but first must be flat rolled to a thickness of 0.9 mm. The strip has a width of 25 mm and an initial thickness of ho=1.5 mm. A preliminary process design suggests a 40% reduction in a single pass on a rolling mill with 150 mm-diameter rolls. If the roll surface speed is 1 m/s, and the coefficient of friction is μ=0.1, calculate the rolling force and power requirements. Repeat the...
Q.6 Rolling A 28+Y mm thick, 275+X mm wide metal strip is fed through a two – high rolling mill; each roll has a radius of 240+Z mm having a rotational speed of 48+Z rpm. The strip thickness is to be...
Q.6 Rolling A 28+Y mm thick, 275+X mm wide metal strip is fed through a two – high rolling mill; each roll has a radius of 240+Z mm having a rotational speed of 48+Z rpm. The strip thickness is to be reduced to 24+Y mm in one pass. The strength coefficient of the work material is 270 MPa and strain-hardening exponent is 0.12. Determine: a- The minimum coefficient of friction between the strip and roll surface μ (Use dmax =...
coefficient of low carbon steel: 0.7 (static) 0.6 (kinetic) Also need help with this second homework...
coefficient of low carbon steel: 0.7 (static)
0.6 (kinetic)
Also need help with this second homework problem related to metal forming: 2. Given the following for hot rolling a low-carbon steel plate, calculate the number of rolling passes if the maximum load on the roll in each pass is not to exceed 28,400 lb/in^2: - Diameter of the roll: 20 inches (500 mm) - Stock width: 48 inches (1020 mm) - Initial thickness: 1.5 inch (37.5 mm) - Final thickness:...
26. A 42.o-mm-thick plate made of low carbon steel is to be reduced to 34.0 mm...
26. A 42.o-mm-thick plate made of low carbon steel is to be reduced to 34.0 mm in one pass in a rolling operation. As the thickness is reduced, the plate widens by 4%. The yield strength of the steel plate is 174 MPa and the tensile strength is 290 MPa. The entrance speed of the plate is 15.0 m/min. The roll radius is 325 mm and the rotational speed is 49.0 rev/min. Determine the minimum required coefficient of friction that...
NE Steel tubes (k =35 W/m2.K) of 400-mm inner diameter and 30-mm wall thickness are used...
NE Steel tubes (k =35 W/m2.K) of 400-mm inner diameter and 30-mm wall thickness are used to route superheated steam from the boller to the turbine in a power plant. Safety and economic concerns make it practical to add a 200-mm layer of Insulation (k =0.1 W/mK) to each tube, which is wrapped in a thin sheet of aluminum with an emissivity e =0.15. The air (with a convective coefficient h =5 W/m2K) and wail temperatures of the plant are...
Cold water with properties as shown in Table 4 flows at rate of 4 kg/s is...
Cold water with properties as shown in Table 4 flows at rate of
4 kg/s is heated from 28 oC to 54 oC in a shell-and-tube heat
exchanger as shown in Figure 4.The cold water inters the tubes
through thin-walled tubes, each tube has diameter of 19 mm, and the
average velocity inside each tube is 0.355 m /s. The shell side,
one pass is used with hot water as the heating fluid 1.8 kg/s
entering the exchanger at 93...
Make sure to consider all parts of the problem with detail and accuracy. Please show your...
Make sure to consider all parts of the
problem with detail and accuracy. Please show your work and
explain. Thank you!
A cylindrical wheel of uniform density with mass M=11kg and radius R= 2m rolls without slipping on an incline that makes an angle of 0 = 30° with the horizontal, as shown in the diagram; there is friction between the wheel and the ramp. A block of equal mass Mis sliding on a separate, frictionless incline, also forming an...
#1. To reduce nitrogen oxide emissions from a diesel engine, one commonly used strategy is exhaust...
#1. To reduce nitrogen oxide emissions from a diesel engine, one commonly used strategy is exhaust gas recirculation (EGR). In a stack-type EGR cooler, exhaust gases flow through tubes with a rectangular cross-section (4 mm x 6 mm). In each tube, the mass flow rate of exhaust gases is 0.0001 kg/s; the gases enter at 140°C while the inner surface of each tube is maintained at 80°C due to water being circulated as a coolant. The length of the tube...
Q3. ( 25 points) A rolling mill used to reduce a sheet strip by 3 mm in thickness. The sheet has 2.5 cm thickness and 30 cm in width. The rolling speed is 0.83 rev/sec. The sheet material flow stress is given by a = 275€0.15. A compression test was conducted to find the coefficient of friction and revealed that the coefficient of friction is 0.12. Check if the friction is adequate for the rolling operation. If it is calculate...
coefficient of low carbon steel: 0.7 (static)
0.6 (kinetic)
Also need help with this second homework problem related to metal forming: 2. Given the following for hot rolling a low-carbon steel plate, calculate the number of rolling passes if the maximum load on the roll in each pass is not to exceed 28,400 lb/in^2: - Diameter of the roll: 20 inches (500 mm) - Stock width: 48 inches (1020 mm) - Initial thickness: 1.5 inch (37.5 mm) - Final thickness:...
26. A 42.o-mm-thick plate made of low carbon steel is to be reduced to 34.0 mm in one pass in a rolling operation. As the thickness is reduced, the plate widens by 4%. The yield strength of the steel plate is 174 MPa and the tensile strength is 290 MPa. The entrance speed of the plate is 15.0 m/min. The roll radius is 325 mm and the rotational speed is 49.0 rev/min. Determine the minimum required coefficient of friction that...
NE Steel tubes (k =35 W/m2.K) of 400-mm inner diameter and 30-mm wall thickness are used to route superheated steam from the boller to the turbine in a power plant. Safety and economic concerns make it practical to add a 200-mm layer of Insulation (k =0.1 W/mK) to each tube, which is wrapped in a thin sheet of aluminum with an emissivity e =0.15. The air (with a convective coefficient h =5 W/m2K) and wail temperatures of the plant are...
Cold water with properties as shown in Table 4 flows at rate of
4 kg/s is heated from 28 oC to 54 oC in a shell-and-tube heat
exchanger as shown in Figure 4.The cold water inters the tubes
through thin-walled tubes, each tube has diameter of 19 mm, and the
average velocity inside each tube is 0.355 m /s. The shell side,
one pass is used with hot water as the heating fluid 1.8 kg/s
entering the exchanger at 93...
Make sure to consider all parts of the
problem with detail and accuracy. Please show your work and
explain. Thank you!
A cylindrical wheel of uniform density with mass M=11kg and radius R= 2m rolls without slipping on an incline that makes an angle of 0 = 30° with the horizontal, as shown in the diagram; there is friction between the wheel and the ramp. A block of equal mass Mis sliding on a separate, frictionless incline, also forming an...
#1. To reduce nitrogen oxide emissions from a diesel engine, one commonly used strategy is exhaust gas recirculation (EGR). In a stack-type EGR cooler, exhaust gases flow through tubes with a rectangular cross-section (4 mm x 6 mm). In each tube, the mass flow rate of exhaust gases is 0.0001 kg/s; the gases enter at 140°C while the inner surface of each tube is maintained at 80°C due to water being circulated as a coolant. The length of the tube...
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