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q can you explain shell moldsthese molds are prepared by pouring a mixture of sand and thermosetting resin over the heated surface of a metallic
q can you implement compatibility test this test indicates the decrease in height of a mass of sand in a specimen tube with respect to its original
q what is shatter testshatter test this test is measure of toughness of the moulding sand it indicates the capacity of the moulding sand to with
q how can you test hardness of the prepared mouldhardness test the hardness of the prepared mould surface is tested to check the ramming density of
strength tests these tests are carried out to check the holding powers of various binders used in green moulding sand dry moulding sand and core sand
q determine the size of grains using fineness test of sandfineness test fineness test of sand specimen determines the size of grains and the
q how can you implement permeability test as already defined permeability of porosity of the moulding sand is the message of its ability to
q illustrate clay content testunder this test the clay content is measured by washing it off the sand sample the standard dried sand sample 50 gm is
q illustrate moisture content test moisture content test moisture is an important constituent of moulding sand its content in the moulding sand can
q what are the basic use of sand rammerit is the apparatus of make specimens of moulding sand for tests such as - permeable test the various strength
q explain basic types of sand testingmoulding sands should be of proper quality to meet the required level of accuracy and surface finish of castings
q explain moulding sand for non-ferrous casting the melting point of non- ferrous metal is much lower than that of ferrous metals therefore the
describe mould surface coatingmould surfaces are coated after the pattern is drawn out with certain materials possessing high refractoriness
q describe dry and wet parting materialsdry parting materials these are applied by dusting these include charcoal ground bone and limestone
q explain system and parting sandsystem sand in mechanized foundries where machine moulding is employed a so called system sand is used to fill the
q describe the type of facing and backing sandfacing sand this sand is used directly next to the surface of the pattern and comes into contact with
q explain the cushion materials which used in moulding sandthese materials when added to the moulding sand burn and from gases when the molten metal
q describe facing materialfacing materials these materials when added to the moulding sand tend to obtain smoother and cleaner surfaces of
q can you explain about fuel oil and dextrinfuel oil it improves the mould ability of sandiron oxide it develops hot strengthdextrin it increases air
q illustrate wood and silica flourwood flour it is ground wood particles or other cellulose materials such as grain hulls they serve the same purpose
q how can we use cerealsfoundry cereal is finely ground corn flour or corn starch it 025-2 increases the green and dry strengths of the moulding sand
q can you illustrate sea coalsea coal or coal dust is finely ground soft coal pulverized coal it is added to moulding sand used to make ferrous
q why we need additives explainadditives are the materials added in small quantities to the moulding sand in order to enhance its exiting properties
q describe organic binders and its workingorganic binders the binders are most frequently used in core making cereal binders are obtained from wheat
q can you explain bentonite bindersits general composition is mgoal2o3sio2h2o it is formed by weathering of volcanic or igneous rocks it is a creamy