MNFG 290 Chapter 13

• Highly directional properties are most likely to occur within the columnar zone.
• Casting processes exploit the properties of a liquid as it flows into and assumes the shape of a prepared container and then solidifies on cooling.
• What are the two parts of a flask in the sand casting process?

  A cope and drag
• Which of the following are expendable mold casting processes?

  Sand casting, shell casting, and investment casting
• The outermost part of a typical cast product is known as the

  chill zone
• What is the purpose of a riser in a sand mold?

  To ensure the mold cavity is filled.
• Sand cores can be used in high pressure die casting.

  False
• What material is used for investment casting patterns?

  Wax
• A ________ is an approximate duplicate of the final casting

  pattern
• The network of connected channels used to deliver the molten metal to the mold cavity is known as the ________.

  gating system
• A ________ is the bottom half of a horizontally parted mold.

  drag
• The ________ is the plateau in the cooling curve that occurs during the solidification of a material with fixed melting point.

   

  thermal arrest
• The pattern material with the greatest longevity below is

  epoxy
• ________ exploit the ductility or plasticity of certain materials to produce the desired shape by moving or rearranging the solid.

  Deformation processes
• A small amount of ________ is often present at the parting line.

  flash
• Which of the following are expendable mold casting processes?

  Sand casting, shell casting, and investment casting
• What is the shape of the mold cavity made with in a sand mold?

  Pattern
• The innermost part of a typical cast product is known as the

  equiaxed zone
• A ________ is an additional void in the mold that also fills with molten metal.

  riser
• With ________, the removal of a complex cast shape may be a major design problem.

  multiple-use molds
• The following materials can be thermoformed:

  Thermoplastics
• Which of the following is/are a type of ceramic?

  A) 

  Glasses

  B) 

  Crystalline ceramics

  Both a and b
• Which of the following are desirable properties of plastic products?

  1) 

  Low thermal conductivity and electrical resistance

  2) 

  Low cost and formability

  3) 

  Unlimited color range and light weight

  4) 

  Corrosion resistance

  All of the above
• What plastic manufacturing process is used to produce polypropylene sheets?

  Extrusion molding
• What type of polymer is generally used in blow molding?

  Thermoplastic
• Which of the following plastic molding processes starts from a preform made from another molding process?

  Blow molding
• In plastic molding, _____________ helps facilitate part removal from the mold.

  an unidirectional taper
• __________ is a process that can be used for plastics, metals, and ceramics alike.

  Injection molding
• In injection molding, raw material is fed into a cavity from the hopper by _______.

  gravity
• What material is used for investment casting patterns?

  Wax
• What are the two parts of a flask in the sand casting process?

  A cope and drag
• A ________ is an approximate duplicate of the final casting

  pattern
• The ________ is the temperature of the liquid metal when it first enters the mold.

  pouring temperature
• Sand cores can be used in high pressure die casting.

  False
• The pattern material with the greatest longevity below is

   

  epoxy
• The outermost part of a typical cast product is known as the

  chill zone
• The network of connected channels used to deliver the molten metal to the mold cavity is known as the ________.

  gating system
• Live risers receive the ________ hot metal that enters the mold.

  last
• The ________ is the plateau in the cooling curve that occurs during the solidification of a material with fixed melting point.

  thermal arrest
• ______ exploit the properties of a liquid as it flows into and assumes the shape of a prepared container and then solidifies on cooling.

  Casting processes