Types of patterns
Types of patterns used in Casting Process Types of patterns: The following factors affect the choice of a pattern. (i) Number of Castings to be produced. (ii) Size and complexity of the shape and size of casting (iii) Type of molding and castings method to be used. (iv) Machining operation (v) Characteristics of castings Different types of patterns: The common types of patterns are: 1) Single piece pattern 2) Split piece pattern 3) Loose piece pattern 4) Gated pattern 5) Match pattern 6) Sweep pattern 7) Cope and drag pattern 8) Skeleton pattern 9) Shell pattern 10) Follow board pattern Figure 1: Single piece, Split, Match-plate, Cope and Drag Pattern Single piece pattern: This is the simplest type of pattern, exactly like the desired casting. For making a mould, the pattern is accommodated either in cope or drag. Used for producing a few large castings, for example, stuffing box of steam engine. Split pattern: These patterns are split along the part