● Preformed core baked sand or green sand aggregate placed into a mold to shape the inside of solutions that can not be shaped by the pattern.
● The wood core or metal box structure, the cavity of which the shape of the heart is required to have been there.
● A core box, like a pattern is formed by the pattern maker.
● Cores run from very simple to extremely complex.
● Could simply form cylinder heart that need to heart round hole through the hub of a wheel or it may be a core complex used to core out of the water cooling channels in cast iron engine block as well as the within the cylinders.
● Dry sand cores are mostly made from sour ,, dry silica sand-free clay mixed with binder and baked until cured; The binder cement the sand together.
● When the metal is poured into the core held together long enough for the metal to solidify, then the binder is finely cooked, the heat from the casting, until its bonding power lost or burned out. If the correct key combination for the job, it can be easily removed from the inner castings simply by pouring it out as sand heart burned. The key characteristic of a mixture called on collapsibility.
● The amount and temperature of casting pouring determines how well and how long the heart will stay together. Dry sand core with wire support.
● gas must be generated within the core during pouring vented to the outside of the mold to prevent gas porosity and defect called heartbeat.
● Also, there must be a solid core hot enough to be handled and used properly.
● refers to the hot strength to strength and being heated by the casting operation. Because of the shape and number of cores must be further strengthened with rods and wires.
● A core long span a period of cast iron pipe would be required to prevent the heart rodding from sagging or bending upward when the model poured because the liquid metal exerting strong pressure during pouring .