AFS Sand Casting Conference October 20-22 2014 –Indianapolis IN USA SIGNIFICANCE OF SCREEN ANALYSIS AND AFS GRAIN FINENESS •The distribution of the green sand has a bearing on the physical properties that can be developed by the green sand system The distribution influences the amount of bond required and the surface finish of the castings

Experimental techniques which included the mechanical sieve analysis determination of clay green hardness permeability and shatter index tests of moulded specimens were Table 6 Calculation for AFS grain fineness number for sand More details Get Price

288 Foseco Non-Ferrous Foundryman's Handbook make cost analyses to quickly determine the most cost-effective feeding system for any given casting dimensional 22 Acid demand value of sand 151 measurement of 153 Adhesives for core assembly 215 AFS Grain Fineness Number calculation of 16 Age hardening of aluminium alloys 44 Air set

grade silica sand having AFS grain fineness used for first two coats called prime coats having AFS grain fineness number 42 was e develop more thickness to the shell walls wi shells were air dried for 24 hours Two shel in an induction furnace under vacuum [2-22 Table 1 Element Ni Cr Co Mo %wt 58 0 min 22 0 15 9 0 Figure 2 Investment sh

In Building Materials in Civil Engineering 2011 (1) Grain Gradation and Coarseness of Sand The grain gradation and coarseness of sand are determined by screen residue analysis Grading region and fineness modulus can be used to express the gradation and the coarseness of sand particles respectively A set of square-hole sieves whose diameters are 4 75 mm 2 36 mm 1 18 mm 0 60 m

Grain Fineness Number A system developed by AFS for rapidly expressing the average grain size of a given sand It approximates the number of meshes per inch of that sieve that would just pass the sample if its grains of uniform size It is approximately proportional to the surface area per unit of weight of sand exclusive of clay

INTERPRETATION AND APPLICATION OF SAND LABORATORY TEST RESULTS – WHAT THEY MEAN IN THE FOUNDRY PRIORITY OF SAND TESTS 1 Screen analysis – screen distribution and AFS grain fineness number About 90% of a mold is sand so the base sand

Foundry sands usually have a size distribution from 0 1 mm – 0 8 mm with a mean size between 0 2 mm and 0 45 mm A standard parameter to express the size of molding sands is the AFS fineness number (AFS = American Foundry Society) This number is calculated from the size distribution which is determined by standard ASTM sieves

For carry out grain fineness test a sample of dry silica sand weighing 50 gms free from clay is placed on a top most sieve bearing U S series equivalent number 6 A set of eleven sieves having U S Bureau of standard meshes 6 12 20 30 40 50 70 100 140 200 and

Experimental techniques which included the mechanical sieve analysis determination of clay green hardness permeability and shatter index tests of moulded specimens were Table 6 Calculation for AFS grain fineness number for sand More details Get Price

Description Two tests will be performed in this module the AFS 1105-12-S Sieve Analysis (Particle Determination of Sand) and the AFS 1106-12-S Grain Fineness Number AFS GFN Calculation tests Topics that will be covered purpose of the tests basic variables that factor into the tests and performing the tests in a virtual environment

The AFS Grain Fineness Number (AFS-GFN) is one means of measuring the grain fineness of a sand system GFN is a measure of the average size of the particles (or grains) in a sand sample Sand high fineness - cambuse-cully ch Grain Fineness sand test The grain fineness test method is to find the size of the silica sand particles It fine grain

FINENESS MODULUS OF FINE AGGREGATE TxDOT Designation Tex-402-A Effective Date August 1999 1 SCOPE 1 1 This method determines the fineness modulus of concrete fine aggregate used in evaluation of natural and manufactured sands for portland cement concrete 1 2 The values given in parentheses (if provided) are not standard and may not be exact

AFS Grain Fineness Number 60 0 60 0 AFS Clay AFS Clay indicates the amount of fines and water-absorbing material in the sample Procedure - A known amount of dried molding sand mixed with a pyrophosphate solution is stirred The fineness of the sand has a bearing on the physical properties that can be developed by the sand system

Jan 25 2014The AFS Grain Fineness Number (AFS-GFN) is one means of measuring the grain fineness of a sand system GFN is a measure of the average size of the particles (or grains) in a sand sample AFS-GFN gives the metalcasting facility a means to verify its molding sand is staying within specification for the castings being produced and avoid conditions

SILICA SAND WASHED AND DRIED AFS 1105-12-S 1994* Sieve Analysis (Particle Size Determination of Sand) AFS 1106-12-S 1994* Grain Fineness Number AFS GFN Calculation ISO 13503-2 2006*/API RP19C 2008 Section 11 Proppant Crush-Resistance Test ASTM C146 – 94a Acid Demand Value and Paste pH Metals by Fusion and XRF (SGS Labs) Mesh

NO 530 Sand Testing Sieves A nest of 11 AFS sand testing sieves for determining the AFS Grain Fineness Number and distribution of molding and core sands Included are U S A sieves No 6 12 20 30 40 50 70 100 140 200 and 270 Pan and cover provided Sieves are stacked in order of meshes and test sample placed in top sieve

Effects of Moisture Content on the Foundry Properties of Yola Natural Sand Paul Aondona IHOM1 Particle size distribution of the natural sand the grain fineness number average grain size grain shape and the clay content of the natural machine in AFS perm units

sand the north bank sand with grain fineness number of 48 03 AFS average grain size of 353 50 microns and clay content of 0 8% The core properties of the newly developed binder system compared well with the core properties of the UFFA-BSA binder system and can be a good replacement or alternative to the UFFA-BSA binder system

The AFS fineness number is a measure of the average grain size and it [Heins and Rosenthal 1955] corresponds to the sieve numbers whose opening would just pass all the sand if the sand grains were all to be of the same size Generally a finer grain size results in a smoother as cast surface

What Is Fineness Modulus of Sand? Fineness modulus of sand (fine aggregate) is an index number which represents the mean size of the particles in sand It is calculated by performing sieve analysis with standard sieves The cumulative percentage retained on each sieve is added and subtracted by 100 gives the value of fineness modulus

The scale ranges from 0 to 8 with numbers increasing as the particle size decreases 0 Hegman = 4 mil/100 micron particle size 4 Hegman = 2 mil/50 micron particle size 8 Hegman = 0 mil/0 micron particle size BYK-Gardner offers a wide variety of grind gages varying in scales number of grooves length and width of grooves and size of the block

Based on the correspondence between AFS grain fineness and mesh numbers of the screener the mass of sand on every mesh number can be converted to the AFS grain fineness Formulae for calculating as follows AFS grain fineness= x ∑xi λ (1) Σ xi is the total sum of mass on all meshes λ is the corresponding coefficient shown in

Fineness of the sand shows significant difference in the casting characteristics which influences surface finish and strength of the casting AFS sand fineness numbers 25 and 48 are considered for the study Mould coat is one of the process parameters that provides smooth surface and improves the quality of

afs silica sand manufacturers procedure INTERPRETATION AND APPLICATION OF SAND LABORATORY TEST RESULTS – WHAT THEY MEAN IN THE FOUNDRY PRIORITY OF SAND TESTS 1 Screen analysis – screen distribution and AFS grain fineness number About 90 of a mold is sand so the base sand More Detail Sand testing

distribution of loose dry sand using standard test sieves and calculate the AFS Grain Fineness Number (AFS GFN) an estimate of the average sieve size of a sand sample (0 1 CEU) ST3 Methylene Blue Clay Test In this module the AFS 2210-00-S Methylene Blue Clay Test Ultrasonic Method Molding Sand test will be performed

May 18 2017Permeability decreases with increase in clay content with the potential of castings produced developing gas defects like blow holes 3 2 2 Grain Fineness Number (GFN) The AFS grain fineness numbers for the samples from the five selected natural sand

Effects of Moisture Content on the Foundry Properties of Yola Natural Sand Paul Aondona IHOM1 Particle size distribution of the natural sand the grain fineness number average grain size grain shape and the clay content of the natural machine in AFS perm units

grams sand is placed at the top sieve and after 15 minutes of vibration the weight of the sand retained in each sieve is obtained The AFS grain fineness number of the sand tested can then be determined by taking the percentage of sand retained on each screen multiplying each by a multiplier

Determination of Grain Fineness number (GFN) of Foundry Base Sand GFN is an indication of the average size of the sand grains used in moulding The properties AFS grain fineness number CALCULATION OF AFS GRAIN FINENESS NUMBER Multiplier Weight in (A) 10 20 30 50 70 100 140 200 300 Weight in Cum Wt

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