Metal Forming Quiz

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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


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