Patterns are replicas of the casting required. These are similar in size and shape of the pattern we have to prepare, but not exactly. which are prepared with suitable material and these are used for preparing mould cavity.
The type pattern to be used for a particular casting depends upon many factors like design of casting, complexity of shape of product, number of castings to be prepared, surface finish and accuracy. The different types of pattern are given below:
(i) Solid (or) Single piece pattern
(ii) Split pattern
(iii) Loose piece pattern (or) Multi-piece pattern
(iv) Match plate Pattern
(v) Sweep pattern
(vi) Gated pattern
(vii) Skeleton Pattren
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