Methods of Sand testing: The moulding sand after it is prepared should be properly tested to see that require properties are achieved. Tests conducted on a sample of the standard sand. The moulding sand should be prepared exactly as it is done in the shop on the standard equipment and then carefully enclosed in a container to safeguard its moisture
Types of Moulding Sands: According to their use in the foundry, moulding sands are classified into following categories: 1. Foundry Green sand: It is a sand used in wet condition for making the mould. It is a mixture of silica sand with 15-25 per cent clay and 6-8 per cent water As explained earlier, green sand moulds are not dried, when
Properties of moulding sands: The important properties are: 1. Strength: · The sand should have adequate strength in its green, dry and hot states · Green strength is the strength of sand in the wet state and is required for making possible to prepare and handle the mould. · If the metal is poured into a green mould the sand
Moulding Sands: Most sand casting operations use Silica sand (SiO2). Usually sand used to manufacture a mould for the casting process is held together by a mixture of water and clay. A typical mixture by volume could be 89% sand, 4% water, 7% clay. Control of all aspects of the properties of sand is crucial when manufacturing parts by sand
1. Rawhide mallet: It is a mallet to loosen the pattern in the mould by striking slightly, so that it can be withdrawn without damaging the mould. 2. Gate cutter: It is a metal piece to the gate the opening that connects tee sprue with the mould cavity. 3. Rapping plate (or) Lifting plate: It is used to facilitate shaking
Moulding Tools: 1. Shovel: It is just like rectangular pan fitted with a handle. It is used for mixing the moulding sand and for moving it from one place to the other. 2. Riddle: It is used for removing foreign materials like nails, shot metal splinters of wood etc from the moulding sand. 3. Rammer: It is a wooden tool
