Upgrade to remove ads
DMP Exam #3 T/F
Terms in this set (35)
Extrusion is only capable of making symmetric cross-sections
Due to the heat generated by plastic deformation during rolling, rolls can become slightly barrel-shaped.
The velocity of the strip increases from its entry value as it moves through the roll gap, in flat rolling.
In edging during performing material is gathered into a localized area, while in fullering the material is distributed away from an area.
In flat rolling, large diameter rolls tend to deform the metal strip plastically more at its surfaces than in the bulk.
As a result of roll bending, the rolled strip tends to be thicker at its center than its edges giving it a camber.
In flat rolling plates and sheets with very high width-to-thickness ratios, the width of the strip increases as a consequence of the reduction in thickness.
Friction is necessary for rolling materials, but, energy is dissipated in overcoming friction.
It is very important that significant lubrication is applied during coining so that the larger conversions in net shape are adequately achieved.
Tolerances achieved in die casting is often better than what can be achieved with sand casting.
The centrifugal casting process uses a polystyrene pattern which evaporates upon contact with molten metal to form a cavity of the casting.
Hot rolling converts the casting structure to a wrought structure with finer grains and enhanced strength.
Fine grained sand used to make molds enhances the mold strength but the fine grain also lowers mold permeability.
The evaporative pattern casting process uses a polystyrene pattern which evaporates upon contact with molten metal to form a cavity for the casting.
In fullering during performing material is gathered into a localized area, while in edging the material is distributed away from an area.
The velocity of the strip decreases from its entry value as it moves through the roll gap, in flat rolling.
As a result of rolling bending, the rolled strip tends to be thicker at its center than its edges giving it a crown.
Flattening of rolls due to elastic deformation results in a smaller roll radius.
Two piece molds consist of a drag on top and cope on the bottom.
The term "green" in green molding sand refers to the color of sand used in molding.
In indirect extrusion, the die moves in a direction opposite to the direction of the extruded billet.
The hot-camber die casting process involves the use of a piston, which traps a certain volume of molten metal and forces it into a die cavity through a gooseneck and nozzle.
Square dies develop dead-metal zones, which in turn form a die angle along which the material flows in the deformation zone.
The shell molding process uses a polystyrene pattern that evaporates upon contact with molten metal to form a cavity for the casting.
It is very important that no lubrication is applied during coining so that the larger conversions in net shape are adequately achieved.
Aluminum required a high level of superheat and hence is not a common material to cast.
The flow stress of the material in impression die forging depends on the strain it experiences in the dies.
In flat rolling, small-diameter rolls tend to deform the metal strip plastically more at its surfaces than in the bulk.
The roll torque requires for its calculation, a knowledge of the speed at which the rolls are rotating.
Surface finishes achieved in sand casting is often poorer than what can be achieved with die-casting.
Cast Iron is the easiest material to hammer and form into multiple shapes, because of its high ductility.
Shaper corners and sudden changes in cross-sections are avoided while designing mold cavities in sand casting.
Cores are placed in molds to carry off gases produced when the molten metal comes into contact with the sand in the mold.
Increased permeability of molds causes high collapsibility thus affecting the quality of the castings.
Two piece molds consist of a cope on the top and a drag on the bottom.
YOU MIGHT ALSO LIKE...
Manufacturing Exam 1
Itec 240 Test 2 Notes
OTHER SETS BY THIS CREATOR
Deutsch vocab lesson 8
Deutsch Vocab A2.1 Exam 1
Deutsch Vocab Unit 4
Deutsch Articles and Plurals (Unit 3)
OTHER QUIZLET SETS
Chapter 13 Multiple Choice- Final
History Midterm 2- Greece and Rome
Biology Chapter 3 and 4