is similar to dressing, but also restores the ideal cylindrical shape of the grinding
wheel.
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Truing
,State three reasons that metals are coated.
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Enhance corrosion resistance
Enhance appearance
Apply color
Prepare surfaces for subsequent operations
Reduce friction
Rebuild surfaces lost to wear and erosion
What are the differences between deep drawing and impact extrusion?
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Deep drawing:
Starts as disk and is pressed into shape
Wall clearance is decided by the thickness of the material starting
Depth is greater than diameter
Impact extrusion:
Starts as a blank
A punch descends rapidly onto a black, which is then extruded forward,
backward, or both
Wall clearance decided by the clearance between the punch and cavity
What is the parting line in injection molding?
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, The line where flash is created between the two halves of the mold
List several reasons why manufactured parts must be cleaned?
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To prepare surface for subsequent industrial processing
Remove contaminants that can chemically react with the surface
Hygienic reasons
Enhance appearance
What are burrs?
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Small pieces that remain attached to the material after machining
Why are mating surfaces roughened prior to gluing?
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The rough surface increases the effective bonding area and mechanical
interlocking between the surfaces, creating a stronger bond.
What kind of fluid is used in ECM for metal removal?
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Electrolytic fluid is used to transfer charge in the gap between the cathode
and workpiece, which causes electron transfer from the workpiece to
remove surface material.
How is/was wrought iron made.
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Made from iron ore, wood charcoal, and clam shells. Smelted in a
"bloomer" which is heated the carbon monoxide from the charcoal reduces
the ore to iron.
What is the function of a runner and gate?
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Runner: a channel for the molten metal to get into the mold
Gate: places where liquid material enters the casting
What is the purpose of a flat washer?
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wheel.
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Truing
,State three reasons that metals are coated.
Give this one a try later!
Enhance corrosion resistance
Enhance appearance
Apply color
Prepare surfaces for subsequent operations
Reduce friction
Rebuild surfaces lost to wear and erosion
What are the differences between deep drawing and impact extrusion?
Give this one a try later!
Deep drawing:
Starts as disk and is pressed into shape
Wall clearance is decided by the thickness of the material starting
Depth is greater than diameter
Impact extrusion:
Starts as a blank
A punch descends rapidly onto a black, which is then extruded forward,
backward, or both
Wall clearance decided by the clearance between the punch and cavity
What is the parting line in injection molding?
Give this one a try later!
, The line where flash is created between the two halves of the mold
List several reasons why manufactured parts must be cleaned?
Give this one a try later!
To prepare surface for subsequent industrial processing
Remove contaminants that can chemically react with the surface
Hygienic reasons
Enhance appearance
What are burrs?
Give this one a try later!
Small pieces that remain attached to the material after machining
Why are mating surfaces roughened prior to gluing?
Give this one a try later!
The rough surface increases the effective bonding area and mechanical
interlocking between the surfaces, creating a stronger bond.
What kind of fluid is used in ECM for metal removal?
, Give this one a try later!
Electrolytic fluid is used to transfer charge in the gap between the cathode
and workpiece, which causes electron transfer from the workpiece to
remove surface material.
How is/was wrought iron made.
Give this one a try later!
Made from iron ore, wood charcoal, and clam shells. Smelted in a
"bloomer" which is heated the carbon monoxide from the charcoal reduces
the ore to iron.
What is the function of a runner and gate?
Give this one a try later!
Runner: a channel for the molten metal to get into the mold
Gate: places where liquid material enters the casting
What is the purpose of a flat washer?
Give this one a try later!
