CORE SAND
It is special kind of molding sand. Keeping the above mentioned objectives in view, the special considerations should be given while selecting core sand. Those considerations involves (i) The cores…
CORE
Cores are compact mass of core sand (special kind of molding sand ) prepared separately that when placed in mould cavity at required location with proper alignment does not allow…
Green Sand Molding
Green sand molding is the most widely used molding process. The green sand used for molding consists of silica, water and other additives. One typical green sand mixture contains 10…
Role Of Riser In Sand Casting
Metals and their alloys shrink as they cool or solidify and hence may create a partial vacuum within the casting which leads to casting defect known as shrinkage or void.…
Factors Controling Gating Design
The following factors must be considered while designing gating system. (i) Sharp corners and abrupt changes in at any section or portion in gating system should be avoided for suppressing turbulence…
GATING SYSTEM IN MOLD
1. Pouring basin It is the conical hollow element or tapered hollow vertical portion of the gating system which helps to feed the molten metal initially through the path of…
VENTING OF MOLDS
Vents are very small pin types holes made in the cope portion of the mold using pointed edge of the vent wire all around the mold surface as shown in…
Steps Involved In Making A Sand Mold
1. Initially a suitable size of molding box for creating suitable wall thickness is selected for a two piece pattern. Sufficient care should also be taken in such that sense that…
Properties Of Moulding Sand
The basic properties required in molding sand and core sand are described as under. Refractoriness Refractoriness is defined as the ability of molding sand to withstand high temperatures without breaking…
Kinds Of Moulding Sand
Molding sands can also be classified according to their use into number of varieties which are described below. Green sand Green sand is also known as tempered or natural sand…
