Different types of foundry or casting patterns are seen as the most tedious operation to workers. Most especially when translating a drawing into a pattern. Nevertheless, casting patterns cannot be escaped in order to carry out other operations to the way to good casting.
There are different types of casting patterns used in foundry shops which are to be considered by the following choice suitable for the castings. they are a number of casting to be produced, types of molding and casting method to be used, machining operation, size and complexity of the shape and size of the casting, and characteristics and casting.
Types of foundry Pattern
The following listed below are the common types of casting patterns used in foundry shops. they are:
- Single piece pattern
- Split piece pattern
- Loose piece pattern
- Gated pattern
- Match pattern
- Sweep pattern
- Cope and drag pattern
- Shell pattern
- Follow board pattern
Single piece pattern:
These types of foundry patterns are less complex in design, accommodated either in cope or drag. Single piece pattern types are used in large castings, e.g. stuffing boxes of steam engines. This pattern is exactly like the desired casting.
These patterns are split along their parting plane either at the flat or irregular surface to make easy extraction of split pattern can be split more than two parts for adequate and complex castings.
Loose piece pattern:
These types of casting patterns are obtained when a piece solid pattern has a backdraft or projections which may lie above and below the parting plane. One disadvantage at loose faces is that adjustment of the projected pattern can be done during ramming which may lead to a drawback of work.
gate patterns contain one or more loose patterns attached with gates and runners. Gated patterns are used in producing small castings in mass production systems and on molding machines due to their higher cost.
Match plate pattern:
these types of casting patterns are similar to split patterns. Having the cope and drag portions mounted on opposite sides of a plate (usually metal) which comply with the contour of the parting surface. Gates and runners are also mounted on the match plate. The match plate pattern is used for a large number of casting that results in higher productivity.
These types of foundry patterns are used when large size of casting is required to be produced in a short time. It is a section or a wooden board of proper contour that is rotated about edge to shape cavity having shapes of rotational symmetry.
Cope and drag pattern:
these types of foundry patterns similar to split patterns having a cope and drag portion, each mounted separately on match plate. They are used in the production of large casting. Its operation cannot be done by a single worker due to the weight and unwieldiness of the molds.
This pattern is just like a sweep pattern made of wooden frames that outline the shape of the part to be cast. Skeleton pattern is for large casting having simple geometrical shapes. It is also used in-pit and floor wooden process.
These types of casting patterns are produced in a mold that outlines the shape of the part to be coated.
Read more: How sand casting is done
Follow board pattern:
These types of foundry patterns are used as a device. It is used for various purposes in foundry work. It is made of wooden board.
That is all for this post, where the various types of foundry/casting patterns are explained. I hope you got a lot from this article, if so, kindly share it with other students. Thanks for reading, see you next time!