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From Flashcardlet > ME 110 > Flashcards

ME 110 Flashcards

0
Q

Knurling

A

To produce a regular shape roughness on cylindrical surfaces.
Performed on a lathe with hardened rolls
Surface of roll is the replica of the profile to be generated
Ex. Making knobs and Handles

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0
Q

Reaming

A

make an existing hole more dimensionally accurate then drilling alone

also improves surface finish

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1
Q

Money

A

Is green

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2
Q

Hardness

A

Resistance to permanent indentation

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3
Q

Modulus of rupture

A

Stress at fracture in bending

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4
Q

Fatigue

A

Components are subjected to cyclic or periodically

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5
Q

Fatigue failure

A

Crack propagation until fracture

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6
Q

Creep

A

Permanent deformation of component under static load maintained for a period of time

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7
Q

Residual stress

A

Can develop because of plastic deformation that is not uniform throughout the part

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8
Q

Specific heat

A

Energy required to raise the temperature by 1° per unit

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9
Q

Thermal shock

A

When he cracked develops on a material after only one cycle

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10
Q

Rolling

A

Active changing thickness or cross-sectional area by a compressive force applied through rollers

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11
Q

Draft

A

Denoted by the difference between initial and final pick

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12
Q

Forging

A

Work pieces shaped by compressive forces applied through various dies and tools

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13
Q

Open die forging

A

Work pieces place between two dies

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14
Q

Impression die and closed die forging

A

Work piece takes shape in the die cavities well-being force between two shape dies

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15
Q

Close die forging

A

The workpiece completely fills the die cavity

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16
Q

Hydrostatic extrusion

A

A work fluid transfers the force to the Billit

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17
Q

Sharing operation punching

A

Where the sheared slug is the scrap. The part cut out

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18
Q

Blinking

A

Where the slug is the part to be used and the rest is scrap

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19
Q

Compound dies

A

Several operations performed on the same sheet one-stroke and one station

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20
Q

Progressive dies

A

Have high production rates for parts requiring multiple forming operations

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21
Q

Press break forming

A

Sheet metal or plate is spent using a mechanical or hydraulic press where movement is only up or down

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22
Q

Turning

A

What pieces rotated and tool removes layer of material as it moves along its length

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23
Q

End milling

A

Rotating cutter travels along certain death in the work

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24
Q

Parting or cutting off

A

Cool moves rapidly inwards as workpiece rotates

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24
Q

Feed or feed rate

A

Distance the tool travels per-unit revolution mm per revolution

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25
Q

Continuous chip

A

gives good surface finish and steady cutting forces but may be undesirable for automated machinery

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26
Q

Build up edge

A

Chip generally results in poor surface finish but a thin stable edge can protect tool surfaces

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27
Q

Discontinuous chip

A

Is desirable for chip removal but cutting forces may fluctuate affecting surface finish and causing chatter

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28
Q

Turning

A

Produce long straight conical or groved shapes as a tool most along its axis

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29
Q

Boring

A

To enlarge a whole

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30
Q

Rake angle

A

Controls direction of chip flow

Positive rank angle improves cutting operation by reducing forces the picture

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31
Q

Material removal rate

A

Volume of material removed per unit time

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32
Q

Chuck

A

Used to clampdown the work

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33
Q

Mandrel

A

Used for hollow cylindrical work pieces

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34
Q

Cores

A

Placed inside mold to create an interior surface

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35
Q

Evaporated pattern casting also known as lost foam process

A

Molten metal is poured into the mold and vaporizes the polystyrene

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36
Q

Elastic deformation

A

Material returns to its original shape when the forces removed

37
Q

Nucleation

A

Initial stage of Crystal formation

Responsible for the number and size of greens

38
Q

Work hardening

A

Used extensively for strengthening material

Work processing at ambient temperature

39
Q

Recrystallization

A

A process within a certain temperature range where New equiaxed and screen free Grains formed replacing the older

40
Q

Permanent Deformation

A

Occurs when the yield stress of the material is reached

41
Q

Modulus of elasticity

Young’s modulus

A

Slope of the elastic portion of the curve and hence stiffness of material
Ratio of stress to strain

42
Q

Poisons ratio

A

Ratio of Lateral strain to longitudinal straight

43
Q

Toughness

A

The area under the true stress truce strain curve.

The amount of energy per unit volume that the material dissipates prior to fracture

44
Q

Hardness

A

Resistance to permanent surface indentation

45
Q

Modulus of rupture

A

The stress fracture in bending

46
Q

Dorometer

A

Checks for hardness of materials such as rubber and plastics and soft metals

47
Q

Ductile fracture

A

Plastic the formation which precedes failure

But the materials down at a point before failing

48
Q

Fatigue fracture

A

Occurs in a brutal manner

49
Q

Eutectic point

A

Point at which the liquid solution decomposes into the components alpha and beta

50
Q

Annealing

A

Process of restoring a cold work or heat-treated alley to its original properties

51
Q

Brass

A

Alloy of copper and zink

52
Q

Bronze

A

Alloy of copper and aluminum

53
Q

Refractory metals

A

Metals that have high melting points

Molybdenum niobium tungsten and tantalum

54
Q

Thermoset cross-linking

A

A three-dimensional structure that has cross-linked by covalent bonds

55
Q

Glass transition temperature

A

Low temperature materials are hard rigid brittle and glassy
But high temperature they are rubbery and leathery
This transition is called class transitioning temperature

56
Q

Sprue

A

A tapered vertical channel through which the molten metal flows downward into the mold

57
Q

Flask

A

Supports the mold itself. Consists of two pieces eight cope on top and a drag on bottom.

58
Q

Parting line

A

This scene between the cope and drag

59
Q

Invested casting

A

Patterns dipped in slurry of refractory metals

60
Q

Draft taper

A

Is provided in Sand mold patterns to enable removal of pattern without damaging

61
Q

Swaging rotary swagging

A

To be subjected to racial and forces by a set of reciprocating dies

62
Q

Powder metallurgy

A

Process in which metal powders are compacted into desired and nothing complex shapes and heated without melt to form a solid piece

63
Q

Honing

A

Used to improve surface finish of holes

64
Q

Lapping

A

Use for finishing flat cylindrical or curved surfaces

65
Q

Chemical machining

A

Uses enchants

66
Q

Photo chemical etching

A

Material is removed usually from flat thin sheet by photographic techniques

67
Q

Ductility

A

Is the amount of permanent plastic deformation prior to fracture

68
Q

Comparing density and melting

A

Materials with higher density usually have a higher melting point

69
Q

Strain hardening

A

Is change in mechanical properties that occur as a result of plastic Deformation with sheer

70
Q

Tempering

A

Improves toughness and reduces hardness

71
Q

Quenching

A

Rapid cooling often to increase Hardness

72
Q

Carbon steel

A

Higher carbon content usually improves hardness and strength

1010 1040

73
Q

Stainless steels

A

Generally use chromium to offer corrosion resistance
300 series more ductile and nonmagnetic
400 series have high-yield strength and are magnetic

74
Q

Copper alloy

A

Relatively high-strength to weight

Low corrosion resistance

75
Q

Feed

A

Millimeters per revolution

76
Q

Feed rate

A

Millimeters per minute

77
Q

Melting point of aluminum alloys

A

480 660

78
Q

Thermoforming

A

Is a process of forming thermoplastic sheets or films over a mold through the application of heat and pressure in this process a sheet is clamped and heated to the sag point (above the glass transition temperature the polymer) enforced against the mold surface by applying a vacuum or air pressure

79
Q

Blowing

A

Material is blown outward towards the mold cavity

80
Q

Shielded metal arc welding

A

Stick welding

81
Q

Gas metal arc welding MIG

A

Maybe automated moderate cost

82
Q

Gas tungsten arc welding

A

Uses argon or helium has an inner shield from oxidation

83
Q

Laser beam welding

A

Focused radiation generates heat at work peace

Low distortion and good automation but high-cost

84
Q

Friction welding

A

Hear generated by friction between parts under high-speed relative motion
Most implementations are rotational

85
Q

Resistance welding

A

Spot welding current may be thousands and thousands of apps

86
Q

Ultrasonic welding

A

High-frequency oscillations with static Normal load

87
Q

Braising and soldering

A

This is capillary action

Belt filler material but not base material

88
Q

Reflow paste soldering

A

Pace is deposited contact areas and then heated

89
Q

Wave soldering

A

Heated surface Pasas across pump standing wave

90
Q

Stereolithography UV curing approach

A

Cares with UV exposure

Resin handling costs are a dis advantage

91
Q

Powder-based approach

A

Selectivity: powder particles joined only wear addressed by the binder or laser

94
Q

Reliability

A

Probability of a likely hood that the part will do what it has to do before it fails

From Flashcardlet (4 decks)

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