EMAE 160 RVW 3 EXAM QUESTIONS
AND ANSWERS
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
Gutters are an example of? - ANSWER-roll forming
What is spinning? - ANSWER-it is a disc or tube of metal spun at high speed to form
an axially symmetric part over a mandrel which
can be done by CNC lathe or by hand
How does shear spinning/flow forming differ from spinning? - ANSWER-in shear
spinning a reduction of the wall thickness occurs.
Why burnish? - ANSWER-To compress surface, remove starches, improve fatigue
life
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
What is bend allowance? - ANSWER-arc length of neutral line b/w tangent points of
a bend in any material.
What does bend allowance directly apply to? - ANSWER-Sheet metal
What is the formula for bend allowance? - ANSWER-BA = A(pi/180)(R + K * T)
R = radius, K = k factor, A = angle and T = thickness.
AND ANSWERS
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
Gutters are an example of? - ANSWER-roll forming
What is spinning? - ANSWER-it is a disc or tube of metal spun at high speed to form
an axially symmetric part over a mandrel which
can be done by CNC lathe or by hand
How does shear spinning/flow forming differ from spinning? - ANSWER-in shear
spinning a reduction of the wall thickness occurs.
Why burnish? - ANSWER-To compress surface, remove starches, improve fatigue
life
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
What is bend allowance? - ANSWER-arc length of neutral line b/w tangent points of
a bend in any material.
What does bend allowance directly apply to? - ANSWER-Sheet metal
What is the formula for bend allowance? - ANSWER-BA = A(pi/180)(R + K * T)
R = radius, K = k factor, A = angle and T = thickness.
