Manu E3 Flashcards
(19 cards)
T or F: Among the advantages of rolling operations is that they deliver net shape or near net shape products with minimal waste.
True
Which of the following is correct regarding the no-slip or neutral point in rolling (Select all that apply):
a) The velocity of the workpiece material is at its peak
b) The velocity of the workpiece material equals the roll velocity
c) The velocity of the workpiece material is at its minimum
d) The pressure on the workpiece is at its peak
e ) The pressure on the workpiece is at its minimum
f) The pressure on the workpiece equals the average pressure
b) The velocity of the workpiece material equals the roll velocity
d) The pressure on the workpiece is at its peak
Which of the following is correct regarding dies in extrusion: (select all that apply)
a) If the die angle is too small the pressure required to push the work billet
increases due to friction
b) If the die angle is too large the pressure required to push the work billet
increases due to turbulence
c) The die angle shouldn’t be considered in the presence of sufficient
lubrication
d) The exit/relief angle is important to reduce friction with the exiting finished part
a) If the die angle is too small the pressure required to push the work billet
increases due to friction
b) If the die angle is too large the pressure required to push the work billet
increases due to turbulence
d) The exit/relief angle is important to reduce friction with the exiting finished part
The maximum possible draft in rolling depends on which of the
following factors (Select all that apply):
a ) Friction between the roll and the workpiece
b ) The radius of the roll
c) The initial thickness of the workpiece
d) The velocity of the roll
a ) Friction between the roll and the workpiece
b ) The radius of the roll
Construction beams like I-beams and L-beams are usually made using
which of the following rolling techniques:
a) Flatt rolling
b) Flashless rolling
c ) Roll piercing
d) Shape rolling
d) Shape rolling
Bolts and screws can be made using various techniques including THREAD ROLLING and MACHINING, match the manufacturing process with the correct product feature:
Higher production rate —->
Higher material waste —–>
Higher accuracy and tighter tolerances—–>
Improved thread strength—–>
Higher production rate —-> THREAD ROLLING
Higher material waste —–> MACHINING
Higher accuracy and tighter tolerances—–> MACHINING
Improved thread strength—–> THREAD ROLLING
Wavy edges is one of the common defects in rolling, which one of the
following is a common cause for this defect:
a) Machine vibration
b) Poor material ductility
c) The workpiece is not at the correct temperature
d) Roll bending
d) Roll bending
What is the effect of increasing the workpiece temperature on the
maximum possible draft in a rolling process?
a) increase
b) decrease
c) It has no effect
a) increase
In wire drawing, which of the following is correct about the draw stress
a) Should equal twice the shear strength of the exiting metal
b) Should stay above the tensile strength of the existing metal
c ) Should stay below the yield strength of the exiting metal
d) Should stay between the yield strength and the tensile strength of exiting metal
c ) Should stay below the yield strength of the exiting metal
Match the type of forging operation with the correct discerption/characteristics:
Q
Open die forging
Impression die forging
Flashless forging
A
Precision forging
Barreling effect
Finished work piece needs trimming
Open die forging—->Barreling effect
Impression die forging—-> Finished work piece needs trimming
Flashless forging—-> Precision forging
Which one of the following operations produce undisturbed grain
structure with relatively low toughness and fatigue resistance.
a ) Wire drawing
b ) Casting
c) Forging
d) Rolling
b ) Casting
In forging operations analysis we tend to use which type of stresses:
a) Average flow stress
b) Yield stress
c) Maximum flow stress
d) Engineering stress
c) Maximum flow stress
Forging operations are usually carried out using machines called:
a) Forging mills
b) Forging hammers and presses
c) Forging disks
d) Forging rings
b) Forging hammers and presses
The heads of bolts, screws, and nails are usually created using which
forging operation:
a) Open die forging
b) Impression die forging
c) Flashless forging
d) Upset/heading forging
e) Swagging and radial forging
d) Upset/heading forging
Which of the following characteristics are important for the die
material in a forging operation? (Select all that apply)
a) High ductility and low yield strength
b) High resistance to physical and thermal shocks
c) High brittleness
d) High wear resistance
b) High resistance to physical and thermal shocks
d) High wear resistance
Swagging and radial forging are two operations used to reduce the
diameter of a solid rod stock which one of the following is correct: (Select all
that apply)
a) In swagging the die stays in a fixed orientation while the work piece rotates
b) In swagging the die rotates while the work piece stays in a fixed orientation
c) In radial forging the die stays in a fixed orientation while the work piece rotates
d) In radial forging the die rotates while the work piece stays in a fixed orientation
b) In swagging the die rotates while the work piece stays in a fixed orientation
c) In radial forging the die stays in a fixed orientation while the work piece rotates
Which of the following is the most common material used in extrusion
operations.
a) Aluminum
b) Steel
c) Copper
d) Ceramics
a) Aluminum
Which of the following is correct about direct and indirect extrusion:
(Select all that apply)
a) Direct extrusion requires less pressure compared to indirect extrusion due to better aerodynamics
b) In indiret extrusion the finished product moves in the opposite direction of the ram
c) The pressure required to push the work bilet through the die increases
significantly toward the end of the billet
d) Extrusion cannot be used to make seamless tubes and hollow sections
b) In indiret extrusion the finished product moves in the opposite direction of the ram
c) The pressure required to push the work bilet through the die increases
significantly toward the end of the billet
Centerburst is a common defect in extruded products cause by:
a) High work part temperatures
b) Ram speed that is too low
c) Insufficient heating of the extrusion container
d) Tensile stresses along the centerline of the work part due to high die angles, low extrusion ratios, and impurities in the work metal
d) Tensile stresses along the centerline of the work part due to high die angles, low extrusion ratios, and impurities in the work metal
