The general sources of receiving molding sands are the seashores, rivers, lakes, deserts and granular elements of rocks.
Molding sands can be classified mainly into two types namely natural or synthetic.
Natural molding sands contain a sufficient amount of binder material. Whereas synthetic molding sands are prepared artificially using basic sand molding constituents (silica sand in 85-91%, binder 6-11%, water or moisture content 2-8%) and other additives in proper proportion by weight with perfect mixing and mulling in suitable equipment’s.
Silica sand in form of granular quartz is the main constituent of molding sand having enough refractoriness which can impart strength, stability and permeability to molding and core sand. But along with silica small amounts of iron oxide, alumina, limestone (CaCO3), magnesia, soda and potash are present as impurities. The chemical composition of silica sand gives an idea of the impurities like lime, magnesia, alkalis etc. present. The presence of excessive amounts of iron oxide, alkali oxides and lime can lower the fusion point to a considerable extent which is undesirable. The silica sand can be specified according to the sand grain size and the shape (angular, sub-angular and rounded) of the sand.
Binders can be either inorganic or organic substances. Binders included in the inorganic group are clay sodium silicate portland cement etc. In the foundry shop, the clay acts as a binder which may be Kaolinite, Ball Clay, Fire Clay, Limonite, Fuller’s earth and Bentonite. Binders included in the organic group are dextrin, molasses, cereal binders, linseed oil and resins like phenol-formaldehyde, urea-formaldehyde etc. Binders of the organic group are mostly used for core making. Among all the above binders, the bentonite variety of clay is the most commonly used. However, this clay alone can’t develop bonds among sand grins without the presence of moisture content in molding sand and core sand.
The amount of moisture content in the molding sand varies from 2 to 8%. This amount is added to the mixture of clay and silica sand for developing bonds. This is the amount of water required to fill the pores between the particles of clay without separating them. This amount of water is held rigidly by the clay and is mainly responsible for developing the strength in the sand. The effect of clay and water decreases permeability with increasing clay and moisture content. The green compressive strength first increases with the increase in clay content, but after a certain value, it starts decreasing. For increasing the molding sand characteristics some other additional materials besides basic constituents are added which are known as additives.
Additives are the materials generally added to the molding and core sand mixture to develop some special properties in the sand. Some commonly used additives for enhancing the properties of molding and core sands are coal dust, cornflour, dextrin, sea coal, pitch, wood flour, silica flour.
Coal dust is added mainly for producing a reducing atmosphere during the casting process. This reducing atmosphere results in any oxygen in the poles becoming chemically bound so that it cannot oxidize the metal. It is usually added in the molding sands for making molds for the production of grey iron and malleable cast iron castings.
Corn flour belongs to the starch family of carbohydrates and is used to increase the collapsibility of the molding and core sand. It is completely volatilized by heat in the sand mold, thereby leaving space between the sand grains. This allows free movement of sand grains, which finally gives rise to mold wall movement and decreases the mold expansion and hence defects in castings. Corn sand if added to molding sand and core sand improves significantly the strength of the mold and core.
Dextrin also belongs to the starch family of carbohydrates that behaves also in a manner similar to that of cornflour. Dextrin increases the dry strength of the molds.
Sea coal is the fine powdered bituminous coal that positions its place among the pores of the silica sand grains in molding sand and core sand. When heated, sea-coal changes to coke which fills the pores and is unaffected by water. Because of this, the sand grains become restricted and cannot move into a dense packing pattern. Thus, sea-coal reduces the mold wall movement and the permeability in mold and core sand and hence makes the mold and core surface clean and smooth.
Pitch is distilled form of soft coal. It can be added from 0.02 % to 2% in mold and core sand. Pitch enhances hot strengths, the surface finish on mold surfaces and behaves exactly in a manner similar to that of sea coal.
Wood flour is a fibrous material mixed with granular material like sand. Wood flour is relatively long thin fibers that prevent the sand grains from making contact with one another. wood flour can be added in between 0.05 % to 2% in mold and core sand. Wood flour volatilizes when heated, thus allowing the sand grains room to expand. Wood flour will increase mold wall movement and decrease expansion defects. Wood flour also increases the collapsibility of both mold and core.
Silica flour is called pulverized silica. Pulverized silica can be easily added up to 3% which increases the hot strength and finish on the surfaces of the molds and cores. It also reduces metal penetration in the walls of the molds and cores.
Backing sand or floor sand is used to back up the facing sand and is used to fill the whole volume of the molding flask. Backing sand is sometimes called black sand because of old, repeatedly used molding sand is black in color due to the addition of coal dust and burning on coming in contact with the molten metal.
Core sand is used for making cores and it is sometimes also known as oil sand. Core sand is highly rich silica sand mixed with oil binders such as core oil which is composed of linseed oil, resin, light mineral oil and other bind materials. Pitch or flours and water may also be used in large cores for the sake of the economy.
Greensand that has been dried or baked in a suitable oven after the making mold and cores is called dry sand. It possesses more strength, rigidity and thermal stability. Dry sand is mainly used for larger castings. Mold prepared in this sand is known as dry sand molds.
Facing sand forms the face of the mold. It is next to the surface of the pattern and it comes into contact with molten metal when the mold is poured. The initial coating around the pattern and hence for mold surface is given by facing sand. Facing sand has high strength refractoriness. Facing sand is made of silica sand and clay, without the use of already used sand. Different forms of carbon are used in facing sand to prevent the metal from burning into the sand. A facing sand mixture for green sand of cast iron may consist of 25% fresh and specially prepared and 5% sea-coal. They are sometimes mixed with 6-15 times as much fine molding sand to make facings. The layer of facing sand in a mold usually ranges between 20-30 mm. From 10 to 15% of the whole amount of molding sand is the facing sand.
Greensand is also known as tempered or natural sand which is a just prepared mixture of silica sand with 18 to 30% clay, having moisture content from 6 to 8%. The clay and water furnish the bond for green sand. It is fine, soft, light, and porous. Greensand is damp when squeezed in the hand and it retains the shape and the impression to give to it under pressure. Molds prepared by this sand are not requiring backing and hence are known as green sand molds. Greensand is easily available and it possesses low cost. Greensand is commonly employed for the production of ferrous and non-ferrous castings.
Loam sand is a mixture of sand and clay with water to a thin plastic paste. Loam sand possesses high clay as much as 30-50% and 18% of water. Patterns are not used for loam molding and shape is given to mold by sweeps. Loam sand is particularly employed for loam molding used for large grey iron castings.
Parting sand without binder and moisture is used to keep the green sand not to sticking to the pattern and also to allow the sand to the parting surface the cope and drag to separate without clinging. Parting sand is clean clay-free silica sand that serves the same purpose as parting dust.
In mechanized foundries where machine molding is employed. System sand is used to fill the whole molding flask. In mechanical sand preparation and handling units, facing sand is not used. The used sand is cleaned and re-activated by the addition of water and special additives. This is known as system sand. Since the whole mold is made of this system sand, the properties such as strength, permeability and refractoriness of the molding sand must be higher than those of backing sand.
Adhesiveness is a property of molding sand to get the stick or adhere to foreign material such as sticking molding sand with the inner wall of the molding box.
Cohesiveness is the property of molding sand by virtue that the sand grain particles interact and attract each other within the molding sand. Thus, the binding capability of the molding sand gets enhanced to increase the green, dry and hot strength properties of molding and core sand.
After the molten metal in the mold gets solidified, the sand mold must be collapsible so that free contraction of the metal occurs and this would naturally avoid the tearing or cracking of the contracting metal. In absence of collapsibility property, the contraction of the metal is hindered by the mold and thus results in tears and cracks in the casting. This property is highly required in cores.
As soon as the molten metal is poured into the mold, the moisture in the sand layer adjacent to the hot metal gets evaporated and this dry sand layer must have sufficient strength to its shape in order to avoid erosion of the mold wall during the flow of molten metal. The dry strength also prevents the enlargement of the mold cavity caused by the metallostatic pressure of the liquid metal.
Flowability or plasticity is the ability of the sand to get compacted and behave like a fluid. It will flow uniformly to all portions of the pattern when rammed and distribute the ramming pressure evenly all around in all directions. Generally, sand particles resist moving around corners or projections. In general, flowability increases with a decrease in green strength and vice versa. Flowability increases with a decrease in grain size of sand. The flowability also varies with moisture and clay content in sand.
The green sand after water has been mixed into it must have sufficient strength and toughness to permit the making and handling of the mold. For this, the sand grains must be adhesive, i.e. they must be capable of attaching themselves to another body. Therefore, sand grains having high adhesiveness will cling to the sides of the molding box. Also, the sand grains must have the property known as cohesiveness i.e. ability of the sand grains to stick to one another. By virtue of this property, the pattern can be taken out from the mold without breaking the mold and also the erosion of mold wall surfaces does not occur during the flow of molten metal. The green strength also depends upon the grain shape and size, amount and type of clay and moisture content.
Permeability is also termed as the porosity of the molding sand in order to allow the escape of any air, gases or moisture present or generated in the mold when the molten metal is poured into it. All these gaseous generated during the pouring and solidification process must escape otherwise the casting becomes defective. Permeability is a function of grain size, grain shape, and moisture and clay contents in the molding sand. The extent of ramming of the sand directly affects the permeability of the mold. Permeability of mold can be further increased by venting using vent rods.
Refractoriness is defined as the ability of molding sand to withstand high temperatures without breaking down or fusing thus facilitating to get sound casting. It is a highly important characteristic of molding sands. Refractoriness can only be increased to a limited extent. Molding sand with poor refractoriness may burn onto the casting surface and no smooth casting surface can be obtained. The degree of refractoriness depends on the SiO2 i.e. quartz content, and the shape and grain size of the particle. The higher the SiO2 content and the rougher the grain volumetric composition the higher is the refractoriness of the molding sand and core sand. Refractoriness is measured by the sintering point of the sand rather than its melting point.
3.9 Miscellaneous properties of molding sand
In addition to the above requirements, the molding sand should not stick to the casting and should not chemically react with the metal. Molding sand needs to be economically cheap and easily available in nature. It need to be reusable for economic reasons. Its coefficients of thermal expansion need to be sufficiently low.