ENGM 445 MID TERM STUDY SET (HOMEWORK 5) |
QUESTIONS AND ANSWERS | 2026 UPDATE | 100%
CORRECT
100% Correct 20
Incorrect 0
1 of 20
Term
Wire stock of initial diameter = 0.125 in is drawn through two dies
each providing a 0.20 area reduction. The starting metal has a
strength coefficient = 40,000 lb/in2 and a strain hardening exponent
= 0.15. Each die has an entrance angle of 12°, and the coefficient of
friction at the work-die interface is estimated to be 0.10. The motors
driving the capstans at the die exits can each deliver 1.50 hp at 90%
efficiency. Determine the maximum possible speed of the wire as it
exits the second die.
-First draw exit velocity = 6.24 ft/sec, and for second draw, v = 2.46
ft/sec
,-First draw exit velocity = 3.47 ft/sec, and for second draw, v = 6.27
ft/sec
-First draw exit velocity = 6.24 ft/sec, and for second draw, v = 3.47
ft/sec
Give this one a try later!
False. Tube and pipe cross sections can be produced by either direct or indirect
extrusion.
Coefficient of friction between roll and work. Roll diameter. dmax = mu^2*R
First draw exit velocity = 6.24 ft/sec, and for second draw, v = 3.47 ft/sec
The ratio of the pressure required to extrude a cross section of a given shape
relative to the extrusion pressure for a round cross section of the same area.
Don't know?
, 2 of 20
Term
A low-carbon steel plate is 270 mm wide and 25 mm thick. It is
reduced in one pass in a two-high rolling mill to a thickness of 20
mm. Roll radius = 300 mm, and roll speed = 30 m/min. Strength
coefficient = 500 MPa, and strain hardening exponent = 0.25.
Determine (a) roll force, (b) roll torque, and (c) power required to
perform the operation.
-(a) 1,974,600 N , (b) 84,668 N-m , (c) 100.4 kW
-(a) 2,874,657 N , (b) 55,668 N-m , (c) 185.4 kW
-(a) 4,874,657 N , (b) 55,668 N-m , (c) 321.4 kW
Give this one a try later!
(a)rx = 12.566, true e = 2.531,
extrusion ex = 4.09
(a)80,579 lb (b) 153,822 lb. (b) shape factor, Kx = 1.023
(c) length L = 94.247 in
(d) = 93,142 lb/in2
Flash formation, more complex part (a) 2,874,657 N , (b) 55,668 N-
shapes. m , (c) 185.4 kW
Don't know?
3 of 20
Term
An indirect extrusion operation is performed on an aluminum billet
with diameter = 2.0 in and length = 8.0 in. Final shape after extrusion
QUESTIONS AND ANSWERS | 2026 UPDATE | 100%
CORRECT
100% Correct 20
Incorrect 0
1 of 20
Term
Wire stock of initial diameter = 0.125 in is drawn through two dies
each providing a 0.20 area reduction. The starting metal has a
strength coefficient = 40,000 lb/in2 and a strain hardening exponent
= 0.15. Each die has an entrance angle of 12°, and the coefficient of
friction at the work-die interface is estimated to be 0.10. The motors
driving the capstans at the die exits can each deliver 1.50 hp at 90%
efficiency. Determine the maximum possible speed of the wire as it
exits the second die.
-First draw exit velocity = 6.24 ft/sec, and for second draw, v = 2.46
ft/sec
,-First draw exit velocity = 3.47 ft/sec, and for second draw, v = 6.27
ft/sec
-First draw exit velocity = 6.24 ft/sec, and for second draw, v = 3.47
ft/sec
Give this one a try later!
False. Tube and pipe cross sections can be produced by either direct or indirect
extrusion.
Coefficient of friction between roll and work. Roll diameter. dmax = mu^2*R
First draw exit velocity = 6.24 ft/sec, and for second draw, v = 3.47 ft/sec
The ratio of the pressure required to extrude a cross section of a given shape
relative to the extrusion pressure for a round cross section of the same area.
Don't know?
, 2 of 20
Term
A low-carbon steel plate is 270 mm wide and 25 mm thick. It is
reduced in one pass in a two-high rolling mill to a thickness of 20
mm. Roll radius = 300 mm, and roll speed = 30 m/min. Strength
coefficient = 500 MPa, and strain hardening exponent = 0.25.
Determine (a) roll force, (b) roll torque, and (c) power required to
perform the operation.
-(a) 1,974,600 N , (b) 84,668 N-m , (c) 100.4 kW
-(a) 2,874,657 N , (b) 55,668 N-m , (c) 185.4 kW
-(a) 4,874,657 N , (b) 55,668 N-m , (c) 321.4 kW
Give this one a try later!
(a)rx = 12.566, true e = 2.531,
extrusion ex = 4.09
(a)80,579 lb (b) 153,822 lb. (b) shape factor, Kx = 1.023
(c) length L = 94.247 in
(d) = 93,142 lb/in2
Flash formation, more complex part (a) 2,874,657 N , (b) 55,668 N-
shapes. m , (c) 185.4 kW
Don't know?
3 of 20
Term
An indirect extrusion operation is performed on an aluminum billet
with diameter = 2.0 in and length = 8.0 in. Final shape after extrusion
