Inspection of Castings: A large number of methods have been developed to inspect castings for defects that may occur during their production. Such inspections may be in process inspections or finished product inspections. In process inspections are carried out before a lot of castings have been completed to detect any flaws that may have occurred in the process so that
Sand Casting Defects: • Production of castings involves a large number of steps including casting design, pattern making, moulding, melting, pouring, shake out, fettling, inspection and finishing. • It is not uncommon for one or more of these steps to be performed unsatisfactorily due to use of defective material or equipment, carelessness of the operator or lack of skill. •
Sand Casting Defects: • Production of castings involves a large number of steps including casting design, pattern making, moulding, melting, pouring, shake out, fettling, inspection and finishing. • It is not uncommon for one or more of these steps to be performed unsatisfactorily due to use of defective material or equipment, carelessness of the operator or lack of skill. •
Centrifugal Casting: Centrifugal casting is done by pouring molten metal into a rotating mould. The centrifugal force acting on the mould helps in feeding and positioning the metal in the mould. Mould rotation is continued till after the metal is solidified. Centrifugal casting results in denser and cleaner metal as heavier metal is thrown to parts of the mould away
Die Casting: The die casting process uses steel dies into which metal is forced under pressure through a runner and gate to fill the dies. The pressure (70 to 5000 kg/cm2) is maintained while the casting solidifies after which the dies are separated, cores are withdrawn and the casting is ejected. Metals and alloys that are die cast include zinc,
Permanent Mould Casting: Permanent mould casting, also sometimes called gravity die casting employs moulds which can be used more than once and hence are permanent. These moulds are usually made in more than one piece to facilitate removal of the finished casting. The mould is assembled; and held together by clamps, screws or toggles during pouring. In the assembled position
