CPM Industries' Blog

3 Types of Cores Used to Make Sand Castings

Posted by Tim Carlstedt

How are hollow passage ways or special features put into a casting?

Through the Use of Cores that are Placed into the Mold Box!! 

In this part 1 of 2, we will discuss the common names and terms for Cores and Coreboxes that are used in the horizontal green sand casting method.  At CPM Industries, we often use Cylinder Cores, Balanced Cores and Dovetail Cores with Patterns to create the necessary passageways to meet the component's characteristics.  The article below discusses three types of cores that are placed on the parting line of the casting.

Cylinder Cores

    • These cores are the simplest cores created.  The core stretches across the casting cavity and is fitted into core print sockets that extend over the edge of the cavity.  The fit into the core print will allow for the stabilization of the core, which will in turn, allow for creation the passage desired for the casting. 

      • The most common use stretches straight across the cavity, but bends or turns are common too and can also be created for the desired passageway in the casting. 

      • A common example are Aluminum Sand Casting or Ductile Iron Pipes

Balanced Cores

    • The Balanced Core is supported by only one core print and projects into the casting cavity.  Since there is only one socket, which is located on the parting line, issues can arise with misalignment and floatation if proper steps are not taken.

      • To alleviate these issues, an extended core print socket is utilized to stabilize the core.  The picture to the right is an example of an extended core print using its length as a counter balance to stabilize the core that is hanging in the mold

Dovetail Cores

    • Dovetail cores are locked into the wall of the drag cavity by a wedge.  These are typically used when a small Balanced Core is required. 

      • A common use will be to create a boss or add features in a recess below the parting line.


Patterns & Tooling from CPM

Tags: Ductile Iron Castings, Casting Design, Aluminum Castings, Cast (Gray) Iron Castings, Magnesium Castings, Sand Casting Design Improvements, CPM Industries, Green Sand Casting Method, Casting Knowledge, Pattern/Foundry Tooling

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