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Types of Patterns and Cores in Casting

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Questions and Answers

What is the primary function of the holes in the plate that allow the top and bottom (cope and drag) sections of the mold to be aligned accurately?

To enable the accurate alignment of the cope and drag sections of the mold (correct)
To facilitate the removal of the pattern from the mold after casting
To allow the molten metal to flow into the mold cavity
To provide vents for the escape of gases during pouring

What is the purpose of the gating and riser system in the cope-and-drag patterns mentioned in the text?

To create a vacuum in the mold cavity during pouring
To regulate the temperature of the molten metal as it enters the mold
To provide a path for the molten metal to enter the mold cavity (correct)
To add structural support to the mold during the casting process

What is the primary purpose of a pattern in the sand casting process?

To support the mold during the pouring process
To define the external shape of the cast part (correct)
To create the internal surfaces of the cast part
To control the rate of solidification of the molten metal

What is the main function of a core in the sand casting process?

To form the internal surfaces of the cast part (D) Signup and view all the answers

What is the purpose of the chaplets used in the mold when a core is present?

To hold the core in the desired position during pouring (A) Signup and view all the answers

What is the primary purpose of a match-plate pattern in sand casting?

To provide a means for accurately aligning the cope and drag sections of the mold (A) Signup and view all the answers

What is the primary function of the split pattern in sand casting?

To allow for the easy removal of the pattern from the mold after casting (D) Signup and view all the answers

What is the purpose of the allowances made in the size of the pattern and core for shrinkage and machining?

To ensure the correct final dimensions of the cast part (C) Signup and view all the answers

What is the purpose of the portion of the chaplet that protrudes from the casting after pouring and solidification?

To be cut off after the casting process is complete (B) Signup and view all the answers

What is the primary reason for using a higher melting temperature metal, such as steel, for the chaplets used in a cast iron casting?

To ensure the chaplets do not melt during the pouring of the molten metal (A) Signup and view all the answers