Project ForgeIn a metal casting process to manufacture parts, both patterns and moulds provide shape by dictating where the material should or should not go. Which of the option(s) given correctly describe(s) the mould and the pattern?
- Mould walls indicate boundaries within which the molten part material is allowed, while pattern walls indicate boundaries of regions where mould material is not allowed.
- Moulds can be used to make patterns.
- CPattern walls indicate boundaries within which the molten part material is allowed, while mould walls indicate boundaries of regions where mould material is not allowed.
- Patterns can be used to make moulds.
Explanation
The mould cavity's walls bound the region where molten metal is allowed (A, correct). A pattern creates the mould cavity, so patterns are used to make moulds (D, correct, standard practice). Conversely, pouring metal into a mould produces a casting shaped like the original pattern, which can itself serve as a replacement/check pattern — so moulds can be used to make patterns (B, correct). Option C is wrong: the pattern is removed before pouring and never contacts molten material.
Source: GATE ME 2023 Official Paper (2023)
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