Question

In the case of shell, hotbox or warmbox ______________

(a) Hot water is poured onto the sand mixture

(b) The sand mixture is heated to set the core

(c) Steam is provided to the core mix

(d) The corebox is left in the room temperature

I have been asked this question in class test.

This key question is from Finishing of Cores in section Core and Core Making of Casting-Forming-Welding I

Answer 1

The correct answer is:

(b) The sand mixture is heated to set the core

Explanation: In the shell, hotbox, or warmbox core-making processes, the sand mixture is heated to help set the core. These methods use heat to harden the core material, making it rigid and solid, which is essential for casting applications.

• In shell molding, a thin shell is formed around the core by heating the sand mixture.
• In the hotbox method, the core is hardened by heating the core mixture in a heated mold.
• Warmbox is similar but typically involves moderate temperatures to cure the core mixture.

Other options do not apply directly to these core-making methods:

• Hot water and steam are not typically used in the setting process.
• Leaving the corebox at room temperature would not be effective in setting the core properly.