Metal Forming Quiz
Extension ratio is the shape factor of the process.
False
Extruded components can have variable cross section.
False
Fire tree cracking could be avoided by increasing temperature and speed of extrusion
False
For cold forging lubricate the die.
False
Grain size affect mechanical properties but, has no effects on appearance
False
Tube extrusion must be slow
False
Jacketing may be used with metals that have tendency to stick to container.
True
Jacketing maybe used to extrude power metal.
True
Materials with high m value exhibit the desired diffused straining
True
Most extruded parts with small cross-section require straightening and twisting
True
Open die may be used for breaking down an ingot to be forged.
True
Roller leveling is to improve flatness.
True
Rotary swaging is used for pointing and sizing.
True
Separate trimming is carried out immediately after impression forging.
True
Shiny, fresh—metal surface produced by wear is often desired by consumers.
True
Slitting is similar to can opening
True
Aluminum and magnesium are least suitable for precision forging.
False
Clearance has little effects on shearing
False
Cold working occurs under conditions of temperature and strain rate such that recrystallization occurs simultaneously with deformation
False
Compared to cold work, the advantages of hot work include better reproducibility and interchangeability
False
Conventional ingot production is replacing continuous casting.
False
Draft is the difference between initial and final width of workpiece
False
Earing in deep drawing is due to normal anisotropy
False
High friction between roll and workpiece improve quality of product.
False
In Rolling, the workpiece is formed by a squeezing pressure forcing it through a die opening. (T/F)
False
In extrusion, spider dies are used to produce solid shapes
False
In forging die design is that material flow should be in the direction of maximum resistance.
False
In rolling, there is no sliding between roll and workpiece.
False
In shear spinning diameter and thickness is reduced
False
Internal cracking is attributed to a hydrostatic compressive stress at the center line
False
It is economic to use metal forming for any size batch production.
False
Lancing involves removing pieces or various shapes from the edges
False
Lowering temperature can compensate for spring back
False
Lubrication is an independent (process outcome) variable
False
Most primary rolling is done in a four high mill.
False
Nibbling is more economic for large production runs
False
Piercing is the process of indenting and breaking through.
False
Punching operations may not be done while trimming is taking place
False
Rotary swaging is limited to low rate production.
False
Slab is usually square in section and is processed into rods and wires
False
Steel rules are used for blanking hard metals
False
The clearance in fine blanking is in the order of 41% of the thickness of the blank
False
The impactor forging hammer operation results in significant shock and vibration in the machine.
False
The nature of material flow is a dependent variable
False
There is no flash to eliminate in roll forging.
False
"Hot Twist" is a forge ability test.
True
A billet may have any square section from 1 1/2 in to the bloom
True
A bloom has a square cross section with a minimum size of 6x 6 in
True
About 30 passes are required to reduce a large ingot into bloom size
True
An ingot of steel has very little use until it is formed into shape
True
Bendability depends on edge conditions also.
True
Center cracking increases with increasing die angle.
True
Changes in lubrication can alter the mode of the material flow during forming and in doing so, modify the properties of the final product.
True
Cold worked parts are strain hardened and may have undesirable residual stresses.
True
Crystallographic anisotropy is fibering alignment of impurities and inclusion
True
Die cutting may include parting
True
Extruded components have an elongated grain structure.
True
Foil has one dull side when it is pack rolled.
True
For rolling sheet metal the radius of the camber' is generally 0.01. greater in the center than the edge.
True
Forged components have directional properties.
True
Hammer Forging Press is usually preferred for use with steels.
True
High- energy- rate forming is useful in the forging of high temperature difficult to form alloys.
True
Hot work may lead to grain refinement
True
Hydrostatic extrusion is limited in use because of need for specialized equipments.
True
If the width to thickness is small width spread will increase
True
In extrusion, dummy blocks are placed ahead of the ram to avoid formation of oxide films on hot extruded parts
True
In forging internal draft angle is 7 to 10 degrees. Most important rule
True
In forging thick webs may undergo cracking.
True
In rolling, at the neutral point is a no slip point.
True
In the design of dies radii should be as large as possible.
True
Slabs have a rectangular cross section with a minimum width of 10 in and a minimum thickness of 1 1/2 inch
True
Small aluminum pellets, smaller than grams of rice can be rolled into sheet.
True
Speed of shearing affects width of deformation zone
True
Surface cracking may occur at lower temperature
True
There is no metallurgical changes in thermo forging
True
Upsetting is flat(open)-die forging.
True
While laboratory experiment may be quite valuable, caution should be used when extrapolating their result to different but similar conditions
True
Thickness of rolled plate is... a) more than 1/4" b) more than 1" c) between 1/4" and 1/2" d) none of the above
a) more than 1/4"
A bloom has the following characteristic of ... a) of a square cross-section at least 6" b) processed into plate and sheet c) both of the above d) none of the above
a) of a square cross-section at least 6"
To eliminate luder lines from formed low carbon steels: a. Subject the workpiece to temper treatment b. Subject the workpiece to a skin roll c. Any of the above d. None of the above
a. Any of the above
Sheet metal compared to bulk forming offers- a. Light weight and good strength to weight ratio b. rigidity and stiffness c. Higher expense d.All of the above e. None of the above.
a. Light weight and good strength to weight ratio
Slug is discarded in: a. Punching b. Blanking c. Any of the above d. None of the above
a. Punching
Intricate shapes in Titanium or supper alloys, can produced by a) precession shaping b) Isothermal forging c) coining d) any of the above e) none of the above
b) Isothermal forging
Skew rolling is used a) tapered shafts b) ball bearing c) any of the above d) none of the above
b) ball bearing
Square dies a) used in extrusion of steels b) develop dead-metal zone c) produce a dull surface finish d) all of the above e) none of the above
b) develop dead-metal zone
To gather the material in localized area the following employed... a) fullering b) edging c) any of the above d) none of the above
b) edging
Beveled punch or die leads to a. Rapid force build up b. Reduce force requirement c. Both of the above d. None of the above
b. Reduce force requirement
In piercing the workpiece is... a) constrained in a die b)unconstrained in a die c) any of the above d) none of the above
c) any of the above
Roll force can be reduced by... a) increasing temperature b) applying horizontal tension c) both/ any of the above d) none of the above
c) both/any of the above
Roll force may flatten the rolls and the following effect... a) increase friction b) increase power consumption c) both/ any of the above d) none of the above
c) both/any of the above
Tensile stresses are dominant during: a) extrusion b) rolling c) drawing d) any of the above e) none of the 'above
c) drawing
Bevel gears could be produced a) roll forging b) hubbing c) orbital forging d) any of the above e) none of the above
c) orbital forging
The following materials are extruded with relative ease a) steel b) Mg base alloys c) titanium base alloys d) a and b e) a and c
d) a and b
Extrusion is economic for a) small batch b) Medium bath c) large batch d) any of the above e) none of the above
d) any of the above
Roll force can be reduced by ... a) increasing friction b) use larger diameter rolls c) both/ any of the above d) none of the above
d) none of the above
In shearing burr height increase with: a. Increased clearance b. Increased ductility c. Increased force d. a & b e. a & c
d. a & b
Glass is good lubricant in hot extrusion because a) solid glass enjoy low friction b) becomes fluid and facilitate sliding c) inactive chemically d) a and b e) b and c
e) b and c
Extrusion dies are more expensive than forging dies,
false
In cladding, coaxial billets of metals of dissimilar properties are extruded
false
To reduce cost of complex die it should be made of one piece
false