Shell Molding Process and Applications

The video tutorial introduces shell molding, a casting process where a thin shell mold is made of sand and resin. It covers the steps involved in shell molding, including heating the pattern, forming the shell, and assembling the mold. The tutorial also discusses the advantages, such as smoother surfaces and better accuracy, and disadvantages, like higher costs for small quantities. Examples of parts made using shell molding, such as gears and camshafts, are provided.

What is the primary material used in the shell molding process?

• Clay

• Metal

• Sand with thermosetting resin

• Plastic

In which country was the shell molding process developed?

• Germany

• United States

• Japan

• China

What happens in the second step of the shell molding process?

• The two halves of the mold are assembled.

• The shell mold is stripped from the pattern.

• The box is inverted to allow sand and resin to fall onto the pattern.

• The mold is heated in an oven.

Which step involves heating the sand shell in an oven?

• Second step

• First step

• Sixth step

• Fourth step

What is a key advantage of shell molding regarding the surface of the mold cavity?

• It is less durable than greensand molds.

• It is more porous than greensand molds.

• It is smoother than greensand molds.

• It is rougher than greensand molds.

How does the smoothness of the shell mold cavity affect the casting process?

• It causes more defects in the casting.

• It increases the need for machining.

• It makes the metal flow more difficult.

• It improves the surface finish of the casting.

Why is shell molding considered economical for large quantities?

• It has a faster cooling time.

• It requires less labor.

• It can be mechanized for mass production.

• It uses less material.

What is a disadvantage of shell molding in terms of cost?

• It requires cheaper materials.

• It is less efficient for mass production.

• It is more expensive for small quantities.

• It uses less energy.

Which of the following is an example of a part commonly made using shell molding?

• Plastic bottles

• Ceramic tiles

• Wooden furniture

• Gears and camshafts

What is the main reason shell molding is difficult to justify for small quantities?

• The molds are too large.

• The process is too slow.

• The quality is too low.

• The metal pattern is more expensive.