Test
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Preguntas del test (47)
1The unit cost of material is important in process selsction
- Ain all cases.
- Bwhen direct labor costs are low, usually due to automation.
- Cwhen the type or amount of material differs between the options.
- Dwhen the material cost is high
2Standard tooling should be used when possible because
- ANon-standard tooling adversely affects tolerances
- BSpecial-purpose tooling must be made by specialty vendors
- Cspecial-purpose tooling is usually more expensive
- Dall of the above
3Increasing the complexity of an investment cast part to include additional functionality is an example of which basic rule for economic production.
- AUse standardized designs of a product
- BDesign for appropriate production quantity
- CUtilize special process characteristics
- DAvoid process restrictiveness
4Cold-finished steel is typically
- A3.1 times as expensive as hot rolled steel
- Bstronger than similar alloys that have been processed
- Charder to process by machining, stamping, etc. than hot-rolled products.
- Dall of the above.
5Which steel product would be preferred for a part made by machining?
- AHot-rolled structural shapes (I beam, channel, angle, pipe)
- BHot-rolled bar
- CCold-drawn tubing (square, round, or rectangular)
- DCold-rolled bar
6The harder tempers of aluminum have [blank_start]excellent[blank_end] machinability ratings.
- Aexcellent
- Bgood
- Cfair
- Dpoor
7The stiffness, density and strength of magnesium
- Adiffer significantly between alloys.
- Bare 1/3 that of steel.
- Care about the same of Aluminum.
- Dare lower than other structural metals.
8For long, thin extruded sections with a critical flatness requirement, variations in flatness are reduced if
- AThe walls have constant thickness
- Bribs are added to the sections
- Cthe extrusion is hot-rolled after extrusion
- Dall of the above
9Knifelike edges should be avoided in metal extrusions because they
- ABreak easily
- Bpromote tool wear and die breakage
- Cinterfere with the smooth flow of material through the die
- Dall of the above
10Extreme changes in section thickness should be avoided for (check all that apply)
- AAll metals
- BParticularly steel and less easily extruded metals
- CAll metals with modulus of elasticity less than 25 Mpsi
- DAll metals with yield strength less than 25 ksi
11Among other problems, sharp corners can cause
- AHazards to extrusion plant workers
- BWeld lines due to the increased flow difficulty
- CLess strength in the extrusion owing to stress concentrations
- DAll of the above
12An example of a typical part characteristic for conventional stamping is:
- AUniform wall thickness
- BSimple geometry characterized by circular holes and 90* bends
- CSmooth and square edged
- DAll of the above.
13Which of the following is an example of a short-run stamping method?
- AStraight line shearing
- BRound holes
- CPress-Brake Bending
- DAll of the above
14Cleverly designed stampings can contribute strongly to DFM by
- AIncorporating diverse functions that would otherwise require additional parts
- BIncorporating springs, snap-fit elements, folding tabs, press-fittable designs
- CProviding for projection welding & spot welding
- DAll of the above
15Tooling costs for roll forming are
- ALow
- BModerately high, but more expensive than extrusion dies
- CModerately high, but not as expensive as extrusion dies
- DHigh
16Typically, roll forming requires at least [blank_start]100,000[blank_end]ft/year to be economically feasible.
- A100,000
- B50,000
- C250,000
- D10,000
17The Sejournet process involves
- ACoating an aluminum billet with high-temp lubricant prior to extrusion
- BCoating a steel billet with a proprietary polymer prior to extrusion
- CCoating a steel billet with molten glass prior to extrusion
- DCoating an aluminum billet with a silicon slurry prior to extrusion
18After extrusion, the section is [blank_start]stretch-straightened[blank_end] to remove twist and camber that can result from the extrusion process.
- Astretch-straightened
- Bcold rolled
- Ccold drawnd
- Dhot rolled
19In aluminum, parts have been extruded in what range of circumscribed circle diameter (CCD)?
- AUp to 150 mm
- B.25-40 mm
- C.25-40 inches
- DUp to 7.5 m
20In steel, parts have been extruded in what range of circumscribed circle diameter (CCD)?
- AUp to 150 mm
- B.25-40 mm
- C.25-40 inches
- DUp to 7.5 m
21The minimum quantity for economical extrusion of an aluminum part is
- A80 kg
- B500 kg
- C800 kg
- D1000kg
22In addition to aluminum, which material is commonly extruded?
- ACopper and copper alloys
- BMagnesium
- CCarbon steels
- DAll of the above
23Design recommendations for metal extrusions include (check all that apply)
- AUse generous radii on both internal and external corners
- BSection wall should be balanced as much as possible
- CSection walls should be as thick as possible consistent with design
- DUse stock shapes if possible
24Extrusion have [blank_start]about the same[blank_end] inherent piece-to-piece and drawing-to-piece dimensional variations than parts made with other processes (cold drawing, machining, etc.)
- Aabout the same
- Bmore variable
- Cless
- Dmore
25Should dimensional accuracy after sintering be insufficient, the part can be subjected to a
- ACold drawing process with precision dies
- BSwaging process with precision tools
- CRepressing operation with precision dies
- DAll of the above.
26Some P/M parts, such as bushings, gears, and cams, can be made to be
- AExtraordinarily hard to resist wear
- BSoft to "wear-in" to the mating part
- CSelf Lubricating
- DAll of the above.
27The minimum economically feasible quantity for P/M parts is [blank_start]20,000[blank_end]
- A20,000
- B50,000
- C100,000
- D250,000
28Materials for P/M parts include
- AIron and iron alloys
- BBronze
- CAluminum
- DAll of the above
29Ring rolling produces
- ASeamless rings up to 10 inches in diameter
- Baxisymmetrical shapes from a hollow cylindrical preform
- Cforge welded rings of various shapes and sizes
- Dall of the above
30Flash is usually removed from impression die forgings by
- AMilling
- BIn-press die trimming
- CSecondary die trimming presses
- DGrinding
31Forging is the [blank_start]controlled plastic deformation[blank_end] of a piece of metal into a useful shape, usually at elevated Temperature
- Acontrolled plastic deformation
- Bcasting
- Ccontrolled compression
- Dmolding
32A typical minimum economically feasible production run for a small, 1/4 lb steel part using conventional impression dies is
- A50,000 parts
- B10,000 parts
- C5,000 parts
- D1,000 parts
33Which of the following is NOT generally regarded as readily forgeable?
- ANickel alloys
- BCopper alloys
- CAluminum alloys
- DLow-carbon steels
34Tooling for a typical small forged part may include:
- ABlocker dies give the part only an approximate shape
- BConventional dies that give the part a more refined shape
- CBoth blocker and conventional impressions in the same die
- DAll of the above
35Cold-headed parts exhibit (check all that apply)
- AGood dimensional accuracy
- BImproved resistance to high temperatures
- CImproved mechanical properties
- DReduced ductility
36Cold-headed parts can be economically produced in [blank_start]high (>25,000)[blank_end] quantities?
- Ahigh (>25,000)
- Bmedium (5,000-25,000)
- Clow (500-5,000)
- Dvery low & prototype
37Although most metals can be used to manufacture metal injection molded parts, [blank_start]titanium[blank_end] is not typically used with this method.
- Atitanium
- Bzinc
- Cstainless steel
- Dall of the above
38For many applications, nonmetallic materials offer [blank_start]comparable[blank_end] properties or [blank_start]comparable[blank_end] fabricability compared with metals.
- Acomparable
- Bpoorer
- Csuperior
- Dcomparable
- Emore costly
- Fless costly
39Two properties almost universal among non-metals are
- Ahigh thermal conductivity and high compressive strength
- Blow tensile strength and low modulus of elasticity
- Clow hardness and low modulus of elasticity
- Dlow electrical conductivity and low thermal conductivity
40Soda lme glass, concrete, and tungsten carbide are all members of what group of nonmetallic materials?
- APolymers
- BNatural materials
- CInorganic materials
- DAll of the above
41Polymer materials are available in
- AGranular form, ideal for injection molding
- BBulk forms such as bar and rod
- CBulk forms such as sheet and tube
- DAll of the above
42Carbon and graphite exhibit properties similar to those of ceramics with two majr exceptions. They are:
- ALower in tensile and compressive strength
- BLower in modulus of elasticity and hardness
- CElectrical and thermal insulators
- DElectrically and thermally conductive
43Ceramic materials generally exhibit (check all that apply)
- AHigh hardness
- BGood corrosion resistance
- CGood heat resistance
- DBrittle fracture behavior
44Tungsten carbide exhibits
- AHigh compressive strength, high density, high hardness
- BHigh compressive strength, low density, high hardness
- CHigh CS, low D, low H
- DLow CS, low D, low H,
45The V-ring on a fine-blanking die
- Aclamps the workpiece securely in the die
- Bensures punch and die alignment
- Cproduces an O-ring groove on the finished part
- Dseals the die against dirt and other foreign material
46The fine-blanking process is a press-working technique that utilizes [blank_start]in-press secondary operations[blank_end] to produce parts that are more nearly complete and ready for assembly than conventional stamping.
- Ain-press secondary operations
- Ba special press and precision dies
- Csimple dies with minimum features
- Dhighly-processible, non-ferrous alloys
47As a general guideline, the minimum quantity to justify fine-blanked parts is
- A1,000 - 5,000 parts
- B10,000 - 20,000 parts
- C50,000 - 100,000 parts
- D>250,000 parts
Información
- Descripción
- Test sobre Sin título, creado por Sarah Trinkle el 28/02/2016.
- Autor
- Sarah Trinkle
- Idioma
- English
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