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·value should be the same as that of the specified value in this standard 1 shall include high silica sand natural moulding sand synthetic moulding Rules for rounding off numerical values revised 4 IS 1918 1966 sand mixtures and reclaimed sand placed in heaps on the foundry floor for reuse The term Core Sand shall
·The present investigation focuses on the development of metal casting mold using stone dust as an alternative mold material to silica sand The stone dust aggregate mold having 4 wt % of moisture and 11 wt % of bentonite clay shows desired mold properties as per AFS standard The mold properties such as permeability number hardness B scale
and the last sample is commercially available US silica sand that is used as a control in the study The purpose of this study is to define the durability of the four sand systems selected for foundry usage SAND DISTRIBUTION AND AFS GFN SAND STD SCREEN # B SSS 1 SSS 2 C mm 6 mm 12 850 µm 20 4
·Molding sand is specified in terms of the size and shape of the silica grains it contains the clay content and the moisture content USE FOR SAND PLANT REJECTED IF NOT SATISFIED REQUIRED AFS VALUE SATISFICATION 55 65 =MOLDING SAND 45 55= CORE SAND 5 Chemical composition of moulding sand Silica is the main constituent but
·silica composition >95% sand equivalent value 88 aashto t176 durability index 83 aashto t210 moisture content % astm c566 us sieve size no accum % passing range 10 100 98 100 16 100 95 100 30 88 85 90 40 66 60 70 50 38 35 45 100 3 0 5 passing 200 afs grain fineness 38 applications of our washed sized & air dried fine
·The local silica sand with an AFS number of 51 is coarser after washing than the imported sand AFS number of 66 This trend can also be observed w hen considering the average grain size values The difference • The loss on ignition value for the local sand in the asreceived and washed states is per cent which is much lower than
·An attempt is made in this study to reduce these wastes The bottom ash is mixed with silica sand and the application of metal casting is studied There is a chance to reduce the environmental pollution in the industries The cost of silica sand can also be reduced by mixing bottom ash with it 2 Materials and Moulding materials
·altogether and use alternate non silica material for sand molding However there had been little published research to validate that ceramic and other non silica media could be effectively used in clay bonded green sand casting operations AFS contracted Western Michigan University to validate non silica molding media for use in green sand
5 ·Most metalcasting sand FS is high quality silica sand with uniform physical characteristics It is a byproduct of the ferrous and nonferrous metal casting industry where sand has been used for centuries as a molding material because of its unique engineering properties Because casting quality is inherently linked to sand quality many
The local silica sand with an AFS number of 51 is coarser after washing than the imported sand AFS number of 66 This trend can also be observed w hen considering the average grain size values The difference • The loss on ignition value for the local sand in the asreceived and washed states is per cent which is much lower than
·Methylene Blue Clay Test Molding Sand —AFS 2211 00 S dry and hot strength properties of the green sand The methylene blue clay value varies depending on the type of clay in the binder composite Weekly Tests AFS or 25 Micron Clay Content In this test the percentage of clay and other particles that settle at a rate of less than one
·The study shows that despite the differences between the characteristics of the two silica sands the local sand could be considered a suitable alternative to imported sand for rapid sand casting
·The objective of this investigation is to assess the feasibility of substituting commercial grade silica sand CGSS with granulated blast furnace slag GBFS for green mold casting process Central composite design of response surface methodology RSM is used to optimize mold constituents of the GBFS mold The RSM model predicted the optimal GBFS
Silica and Moulding Sands Association SAMSA the trade body for UK companies supplying all types of silica products Part of the Mineral Products Association MPA but a coarser surface finish may result Expressed as either AFS which is the grain fineness index the higher the number the finer the sand 50 60 70 80 AFS or as AGS
Download Table gives the average grain size of the sand as microns This value falls within the common foundry range of 150 to 400 microns [2 6] While average grain size and AFS grain
·Among from all types of sands silica sand is basically of ignition depends on organic impurities The percentage of CaO causes increase in acid demand value Another reason of refractoriness reduction is higher content of K2O and Na2O Also high acid demand value adversely AFS 45 60 which has low acid demand value less than 6 ml
·ST8 AFS Permeability for Green Sand The AFS 5224 13 S Permeability Standard AFS 2 in Dia x 2 in Test Specimen test will be the focus of this e learning module Prior to performing this test you must complete the following sand tests AFS 5222 13 S 2 in Diameter x 2 in Specimen Preparation Rammer Method and AFS 2251 00 S Riddling
·AFS Grain Fineness Number Ranges 25 180 95 160 50 90 40 160 65 90 have the greatest effect on acid demand value generally varies dramatically from that of the larger ones or impurities are anything different from the base aggregate Impurities color silica sand increase binder require ments for acceptable handling strength and
·Casting is one of the oldest metal manufacturing technique known to humans [1] Among the many variants of casting sand casting is the most prevalent worldwide because of the economics flexibility and range of alloys it offers [2] Although sand casting technology has evolved throughout time the combination of sand and binder used for making of sand molds is
Foundry Sand High Quality and high deposit foundry sand for thousands of years with a Huge Reserve in Egypt which is available in ZAFARAN AND ABOU ZNIEMA and yellow silica sand with quality greater than 98$ while the WITH Quality of % Sio2 with an Iron content average from % % with practical size Distribution from mm mm it s High Quality
The results of chemical analysis of the sand and the clay samples indicated that the sand is of high silica content % and the clay is rich in both silica and alumina contents % and
Crucible fused silica alumina or platinum Balance accurate to at least 3 decimal places Method The test sand should have been pre dried at 110°c ±10°C and desiccated prior to use The empty crucible should also be stabilised prior to use by heating and desiccation then weighed W1 About 10g of sand is added and both are reweighed W2
