Castings by John D. Beadle (eds.)

By John D. Beadle (eds.)

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Fig. 15. A set of four fully machined cope patterns in cast iron, mounted on a 6-in thick steel plate; used for high production of cylinder blocks. ) Fig. 16. Fully machined cast iron cope and drag patterns for producing tractor housings. ) PATTERN CONSTRUCTION Wood patterns There are a variety of methods which may be adopted when constructing a wood pattern. Cheap 'one-off patterns are constructed as easily as possible, the bulk of the pattern can be built in frames and covered with plywood, if the casting has a box like appearance.

These sands are in widespread use in UK foundries. Table 6 lists some brief information of a large number of sands available to the British foundryman. Table 5. Physical and chemical properties of a coarse foundry sand (Chelford No. 50). Source: Chelford, Cheshire. Physical Properties: Description: A washed silica sand of medium coarse grain size. Average AFS fineness No. 48 Visual grain shape: Sub-angular to rounded. % moisture): 251. Loose bulk density: 94 lb/ft3 Geological Age: Glacial Uses: Particularly suitable for use as a core or synthetic moulding sand, where high permeability is required.

4% (on resin) release agent. (a) Tensile strength (AFS method) 400 lbf/ in• (b) Permeability No. 5% Furane Resin 35% (on resin) Acid Catalyst. (a) Useful Bench Life: 20 mins. (b) Compression strength after 1 hr. 149 lbf/in• 2 hrs. 182 lbf/in 2 3 hrs. 223 lbf/in• 24 hrs. n 't) 0·500 0·353 .... :: 150 s: rn 0·104 .... 0689 bar Table 3. Physical and chemical properties of a fine foundry sand (King's L ynn No. 95). high strengths when compacted. 5 mm size or above. 4 mm. Surface characteristics of sand grains It is only recently that research workers 1 • 2 have begun to study the surface properties of sand grains.

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