ME 205: Expendable-Mold Casting Processes Quiz
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Questions and Answers

What is the purpose of the gating system in a sand casting mold?

  • To allow molten metal to flow into the mold cavity
  • To facilitate the removal of the solidified casting
  • To provide a pathway for gases to escape during casting
  • All of the above (correct)

    • Which of the following pattern materials is least commonly used for sand casting?

  • Aluminum
  • Steel (correct)
  • Wood
  • Magnesium

    • What is the purpose of the shrinkage allowance in a sand casting pattern?

  • To compensate for the expansion of the mold during heating
  • To facilitate the removal of the casting from the mold
  • To account for the volumetric contraction of the metal during solidification (correct)
  • To improve the surface finish of the casting

    • According to Chvorinov's Rule, which part of a casting will solidify first?

    <p>The thinnest section</p> Signup and view all the answers

    What is the purpose of the riser in a sand casting process?

    <p>To provide a reservoir of molten metal to compensate for shrinkage</p> Signup and view all the answers

    Which type of pattern is typically used for complex geometries in sand casting?

    <p>Cope-and-drag pattern</p> Signup and view all the answers

    What is the purpose of the shrinkage allowance when designing a pattern for casting?

    <p>To account for the shrinkage of the metal as it solidifies</p> Signup and view all the answers

    What is the purpose of the finish allowance in pattern design?

    <p>To allow for additional material to be removed during machining for a better surface finish</p> Signup and view all the answers

    Which type of sand mold is typically used for larger castings due to its high strength?

    <p>Skin-dried mold</p> Signup and view all the answers

    What is the purpose of the draft (taper) allowance in pattern design?

    <p>To facilitate the removal of the pattern from the mold</p> Signup and view all the answers

    According to Chvorinov's Rule, which factors influence the solidification time of a casting?

    <p>All of the above</p> Signup and view all the answers

    What is the purpose of the rap (shake) allowance in pattern design?

    <p>To facilitate the removal of the pattern from the mold</p> Signup and view all the answers

    What is the main purpose of a riser in casting?

    <p>To facilitate directional solidification</p> Signup and view all the answers

    According to Chvorinov's Rule, which casting will solidify faster?

    <p>A casting with a lower volume-to-surface area ratio</p> Signup and view all the answers

    What is the main cause of shrinkage during casting?

    <p>The solid phase having a higher density than the liquid phase</p> Signup and view all the answers

    What is the purpose of chills in casting?

    <p>To encourage rapid freezing in certain regions of the casting</p> Signup and view all the answers

    What happens during the solidification process of a casting?

    <p>The volume of the metal decreases</p> Signup and view all the answers

    Which statement about Chvorinov's Rule is correct?

    <p>It relates the total solidification time to the volume-to-surface area ratio</p> Signup and view all the answers

    What is the purpose of achieving directional solidification in casting?

    <p>To minimize the damaging effects of shrinkage</p> Signup and view all the answers

    What is the main factor that determines the success of the pouring step in casting?

    <p>All of the above</p> Signup and view all the answers

    Which of the following statements about volumetric changes during casting is correct?

    <p>The volume of the metal decreases during solidification and cooling</p> Signup and view all the answers

    What is the main advantage of casting processes?

    <p>All of the above</p> Signup and view all the answers

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