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q describe fire clay and kaolinite bindersfire clay fire clay is refractory clay usually found in the coal measureskaolinite its general composition
q what do you understand by bindersbinders used in a foundry are inorganic and organic binders organic binders used for core making and will be
q how can you implement chemically coated sandchemically coated sand clean silica grains are sometimes coated with a non thermosetting hydrocarbon
q describe natural and synthetic sandnatural sand a natural sand is the on which is available from natural deposits only assistive and water need to
q explain sand and moulding sandssand according to the amount of clayey matter they contain the moulding sands are classified asbull silica sand
q what do you mean by moulding materialsvarious types of materials are used in the foundries for the manufacture of casting moulds and cores these
q define pattern colour codethe patterns are normally painted with contrasting colours such that the mould maker would be able to understand the
q can you explain corners and fillets corners and filletsthe intersection of the surfaces in casting must be smooth and forms no sharp angles for
q define pattern draft or taperit is also termed as draw it is the taper placed on the pattern surface that are parallel to the direction in which
q explain machining allowancemachining allowance or finish allowance indicates how much larger the rough casting should be over the finished casting
q how can we use of shrinkage allowancesince metal shrinks on solidification and contracts further on cooling to room temperature linear dimensions
q can you explain pattern allowancesthe difference in the dimensions of the casting and the patterns is due to the various allowances considered
gated patternthis is an improvement over the simple pattern where the gating and runner system are integral with the pattern this would eliminate the
types of patternsthere are various types of patterns depending upon the complexity of the job the number of castings required and the moulding
pattern materialsthe requirements of pattern are secure the desired shape and size of the casting cheap and readily available light in mass and
brazing vs weldingfollowing are the differences between brazing and weldingi in brazing the joint surfaces are not raised to fusion point or
brazing is a technique of joining two similar of dissimilar metal pieces together by heating the surfaces and by using a non-ferrous filler metal
types of gas welding processgas welding includes all those welding processes in which gas flame is used as a heat source for melting metals it is
gas welding is a method of joining two metal pieces similar or dissimilar together by melting and fusing their edges at the joint it involves
advantages of welding processwelding results in a good saving of material and reduced labour content of production low manufacturing costs
applications the welding process finds widespread applications in almost all branches of industry and construction
welding processthere are many definition of a welding process but the most comprehensive definition is belowwelding is defined as a a localized
assembly processesthe assembly process for machines and mechanisms is the part of the manufacturing process concerned with the consecutive joining of
heat treatment and surface treatment processes heat treatment processes are employed to improve of a work piece the category includes the processes
power metallurgy- the more appropriate name should be particulate processing methods here the particles of various sizes of metals ceramics polymers