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q write short note on blow moldingorexplain the thermoforming process what are the plastic fabrication method write in brief with neat
q what are the ingredients of moulding componentsans polymer additives one or more of the following materials are added to the polymers either before
q describe the complete procedure of testing permeability of moulding sand how is permeability influenced by various parameters of the moulding sand
q describe shell moulding process merits and demeritsans shell moulding process
blow holes i excessive moisture in the moulding
q what kind of defects are likely to result in castings due to the following i core prints on the core are
difference between fin and swell swell the unintentional bulges found on the casting surfaces are known as swells
difference between blow hole and pin hole porosity blow hole they appear as cavities in a casting when they are
continuous casting in essential the process consists of pouring molten metal into a short vertical metal die or mould at a controlled rate which is
q discuss briefly the causes and remedies of shrinkage cavities casting
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