Types of Patterns

Types of Patterns in Casting Process

  1. Single piece pattern
  2. Split Pattern or two piece pattern
  3. Gated pattern
  4. Cope and drag pattern
  5. Match plate pattern
  6. Loose piece pattern
  7. Follow board pattern
  8. Sweep pattern
  9. Skeleton pattern´╗┐

1. Single piece pattern

Inexpensive and simplest one Single piece, Simple job, Useful for Small scale production Pattern will be entirely in the drag One surface is flat and at the parting line, Used for very small scale production.

2. Split Pattern or two piece pattern

Split Pattern is used for intricate casting, Split along the parting line, Used where depth of job is too high, Aligned with dowel pins fitted to cope.

3. Gated pattern

Gating and runner system are integrated with the pattern
Improves productivity.

4. Cope and drag pattern

Similar to split pattern, For cope and drag, separately attached gating system to metal plate, Heavy and inconvenient for handling, Useful for Continuous production.

5. Match plate pattern

Similar to cope and drag patterns with gating and risering system mounted on a single matching plate, Pattern and match plate are made up of metal (Al), Useful for small casting with high dimensional accuracy, Suitable for large scale production, Gating system is attached to the match plate, Expensive.

6. Loose piece pattern

Withdrawing of the pattern from the mould is difficult, Useful for highly skilled job, Expensive.

7. Follow board pattern

Used for structurally weak portions Bottom board is modified as follow board.

8. Sweep pattern

Useful for Axi-symmetrical and prismatic shape, Suitable for large scale production.

9. Skeleton pattern

Stripes of wood are used for building final pattern, Suitable for large casting.

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