Types of Core

Types of Core Points : Types of Core, Horizontal Core, Vertical Core, Balanced Core, Hanging Core, Kiss Core Kiss Core When the pattern is not provided with core prints and no set is available for-the core to rest, the core is held in position between the cope and drag simply due to the pressure of the cope. Such a core is known as “Kiss Core”. These cores are used when a number of holes are required in the casting and where dimensional accuracy with regard to the relative location of the holes is not important. Balanced Core When the casting has opening only on one side and only one core print is available on the pattern a “balanced core” is used. In such cases, the core print should be sufficiently large to support the weight of the core, which extends into the mould cavity and it should be able to withstand the force of buoyancy of the molten metal which surrounds it. For supporting the core in the mold cavity, chaplets are often used. The chaplets are small piece of metal, specially shaped to it the cavity. Chaplets should be of the same metal as the casting because they finally go in to it. Vertical Core The vertical cores are required to be placed along a vertical axis in the mould. The upper end of the core is forced in the cope and the lower end in the drag. Horizontal and vertical cores are used in foundry work more frequently than cores of any other shapes. These, cores are, therefore generally maintained in stock in various diameters and lengths and referred to as “Stock Cores”. Horizontal Core It is the most common type. It is usually in a cylindrical form laid in the mould horizontally. The ends of the core rest, in the seats provided by the core prints on the pattern. Hanging Core If the core hangs from the cope and does not have any support the bottom in the drag, it is referred to as “Hanging Core”. In such cases, it may be necessary to fasten the core with a wire or rod extending through the cope.