EMAE 160 RVW 3 EXAM QUESTIONS
AND ANSWERS
Fine blanking vs. standard sheet metal stamping? - ANSWER-fine blanking = cutting
sheet metal along a closed outline; the desired product (blank) is the part cut out;
(presses include hardened die punch and blanking die, guide)
Standard sheet metal stamping = drives sharpened tool steel punch through sheet or
strip material into a die cavity. The finished part has predictable edge
Most external threaded fasteners are produced by? - ANSWER-machining, cold
forming/cold heading and manual die
Difference between cold-rolled and hot-rolled steels. - ANSWER-cold-rolled = rolled
to final dimensions below re-crystallisation temperature (adv+disadv: has tighter
tolerances, better surface finish, usually smaller or stronger, more expensive)
hot-rolled = rolled to final dimensions above recrystallization temperature
Is forging always in the vertical direction? - ANSWER-No for example forging press
can be positioned horizontally
What machining process is used in making soda bottles? - ANSWER-stretch blow
molding
Deep draw vs.impact extrusion? - ANSWER-D = sheet-metal operation to make
hollow-shaped parts from sheet blank
I = punch subjects metals to high pressures at room temperature, causing metal/slug
to be squeezed from die cavity forming the product.
Difference between impact and deep draw in material yield. - ANSWER-deep draw =
<80 % material yield
impact = >90 % material yield
Difference between impact and deep draw in wall/bottom thickness ratio. -
ANSWER-deep draw = 1:1 max
impacts = 1:2 min
Difference between impact and deep draw in length/width ratio. - ANSWER-deep
draw = 2:1
impact = 8:1 (Al) and 4:1 (steel)
High pressure tubing is? - ANSWER-seamless
Low pressure pipe is? - ANSWER-welded
Most commonly used metal for extrusion? - ANSWER-Aluminum
Undercarriage tubing for automobiles is formed by? - ANSWER-Hydroforming
AND ANSWERS
Fine blanking vs. standard sheet metal stamping? - ANSWER-fine blanking = cutting
sheet metal along a closed outline; the desired product (blank) is the part cut out;
(presses include hardened die punch and blanking die, guide)
Standard sheet metal stamping = drives sharpened tool steel punch through sheet or
strip material into a die cavity. The finished part has predictable edge
Most external threaded fasteners are produced by? - ANSWER-machining, cold
forming/cold heading and manual die
Difference between cold-rolled and hot-rolled steels. - ANSWER-cold-rolled = rolled
to final dimensions below re-crystallisation temperature (adv+disadv: has tighter
tolerances, better surface finish, usually smaller or stronger, more expensive)
hot-rolled = rolled to final dimensions above recrystallization temperature
Is forging always in the vertical direction? - ANSWER-No for example forging press
can be positioned horizontally
What machining process is used in making soda bottles? - ANSWER-stretch blow
molding
Deep draw vs.impact extrusion? - ANSWER-D = sheet-metal operation to make
hollow-shaped parts from sheet blank
I = punch subjects metals to high pressures at room temperature, causing metal/slug
to be squeezed from die cavity forming the product.
Difference between impact and deep draw in material yield. - ANSWER-deep draw =
<80 % material yield
impact = >90 % material yield
Difference between impact and deep draw in wall/bottom thickness ratio. -
ANSWER-deep draw = 1:1 max
impacts = 1:2 min
Difference between impact and deep draw in length/width ratio. - ANSWER-deep
draw = 2:1
impact = 8:1 (Al) and 4:1 (steel)
High pressure tubing is? - ANSWER-seamless
Low pressure pipe is? - ANSWER-welded
Most commonly used metal for extrusion? - ANSWER-Aluminum
Undercarriage tubing for automobiles is formed by? - ANSWER-Hydroforming
