1. Q1. What are the three main criteria that are used to measure the quality of a casted part?
Ans: Shape (final size),
Mechanical (Stiffness,strength),
Surface quality
Q2. The quality criteria are influenced by several criteria. Please group them in the right way
Ans: Surface quality(optic):Surface porosity,shrinkage, erosionofthe mold
Mechanical Quality: Porosity,Grain Structure, Weldlines
Sizingquality: Shrinkage,Erosion ofthe mold, Misrun
Q3. What are the basic guidelines to ensure a good cast quality?
Ans: a) homogenousadvancing front (towards air vent or riser)
b) solidificationline propagatestowards uncritical areas (riser)
Q4. What are the three primary criteria to evaluate a cast process simulation?
Ans: Regionswith higherrisk of last air
Regionswithcritical turbulence
Regionswithrisk ofa cold shut
Q5. What primary design options that should be considered to remove last avoid air in an
outer region?
Ans: Riser
Air Vents
Q6. Should an early solidification (already during filling) be aimed?
Ans: False
Q7. What is the easiest solution in case a larger riser is not feasible?
Ans:combine the riserwith an exothermicsleeve.
Q8. Often the LPDC method is used to reduce the risk of porosity more or less down to zero.
What is the reason?
Ans: the material is slowlyenteringthe moldfrom the bottom. Turbulence can be avoided.
Q9. What other casting method is using gravity but allows a slow filling (beside LPDC)?
2. Ans: Tilt casting
Q10. Where is the Niyama criteria used?
Ans: Solidificationsimulation
Q11. What is the two parameter that is used to calculate the Niyama criteria?
Ans: Coolingrate
Thermal gradient
Q12. What is the Niyama criteria used for?
Ans: it givesan indication ofthe risk of porosity.
