Materials and Requirements for Core Manufacturing
– Materials required: Core sand, bentonite clay, pulverized coal, resin oil
– Advantages and disadvantages of using cores
– Requirements for cores: Green strength, compression strength, permeability, friability, refractoriness
Types of Cores
– Factors influencing the selection of core type
– Sensitivity of certain metals to gases emitted by core sands
– Melting point considerations for binder removal during shakeout
Core Making Process
– Steps in the core making process: selection of core sand, mixing with additives, core shooting or blowing, core venting, reinforcement of cores
Cheeks in Core Manufacturing
– Uses of cheeks in creating pulleys or replacing cores for reentrant angles
– Role of cheeks as a third segment in the flask
– Advantages and disadvantages of using cheeks
Additional Information
– Core plugs and their relevance
– Sodium silicate’s use in core making
– Core vents and their purpose in foundry practice Source: https://en.wikipedia.org/wiki/Core_(manufacturing)
A core is a device used in casting and moulding processes to produce internal cavities and reentrant angles (an interior angle that is greater than 180°). The core is normally a disposable item that is destroyed to get it out of the piece. They are most commonly used in sand casting, but are also used in die casting and injection moulding.
For example, cores define multiple passages inside cast engine blocks. One model of GM V-8 engine requires 5 dry-sand cores for every casting.
