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q discuss briefly the causes and remedies of misrun and cold shunts casting cold shunt and misrun when the metal is unable to fill
q describe the terms solids zone mushy zone and liquid zone used in solidification of casting and explain directional solidification in castingans
permeability of moulding sand is the property of the sand which permits the gases and steam to escape through the sand mould for this purpose the
machine molding is suitable for the faster and uniform quality moulds needed for mass production of castings for
plastic molds are made of plaster of paris gypsum or calcium sulphate talc and silica flour is added in the plaster of
co2 molds carbon dioxide moulding is the process of hardening the moulds and cores by using carbon dioxide and sodium silicate liquid base binder
a half skeleton pattern for a hollow pipe is shown since the pipe is symmetrical about the pouring line the same pattern will serve the purpose of
gated pattern is used to produce good casting it is essential to make sure that full supply of molten metal flow into every part of the mould
match plate patterns are used where a rapid production of small and accurate castings is desired on a large scale these patterns find a great favour
1 generally moulding sands can be classified as a natural
the commonly used moulding materials for mould making can be broadly classified into the following two groups
material used for patterns the common materials of which the patterns are made of the following 1 wood
casting alloys are - i permanent moulds are commonly used for the casting of grey iron aluminum alloys
inspection of casting visual inspection inspection for dimensional accuracy
the cupola is the most widely used furnace in the foundry for melting ferrous and non ferrous metals and alloysvarious zones of
special casting methods 1 die casting die casting is a permanent mould casting techniques in which
casting means the pouring of molten metal into a mould where solidification occursadvantages of casting process i it
a riser or a feeder head is a passage of sand made in the cope to permit the molten metal to rise above the highest point in the casting after the
a gating system is usually made up of i pouring
design of casting the important factors to keep in mind when designing a casting to obtain maximum strength and minimum casting includes
shell-mould casting is variant of the resin bonded sand technique for casting steel iron or non-ferrous alloysthe mould is made by a mixture of fine
sand castings are porous enough and therefore cannot be used for pressure sight vessels structure obtained by sand casting is loose and hence not
allowances for pattern a pattern is always made larger than the required size of the casting in order to allow for various factor such as shrinkage
types of patterns these depends upon many factors like the bulk of casting type of moulding processes number of castings required and the
pattern practices a pattern may be defined as a replica or fascimile model of the desired casting which when packed or embedded in a appropriate