The Permanent Mould Process
The permanent mould process involves manufacture of grey iron castings in grey iron moulds. Component cavities are accurately copy milled on mould blanks by using CAD/CAM. The machined mould halves are mounted on carousels and are cooled by forced circulation of water or air. As the carousels rotate, mould halves close automatically and molten metal is poured. On solidification, the moulds open and the castings are knocked out. Castings are then annealed, finished and carefully inspected before despatch to customers.
The foundry has two hot blast cupolas with 5 MT/hour capacity for melting metal. Castings are produced in five water cooled carousels and two air cooled carousels and are annealed in oil fired annealing furnaces.
Advantages of Permanent Mould Castings
The permanent mould castings produced in our foundry have the advantages of consistent dimensions over large volumes of production, free machinability, dense non-porous structure, very close dimensional tolerances and high degree of pressure tightness ideal for hydraulic applications.
Automotive, Refrigeration & air-conditioning industries.
- Tensile – 12 to 20 Kgs per sq mm (Depending on section thickness)
- Hardness - 149 to 217 BHN (3000/10)
- Microstructure - Predominantly undercooled graphite in a ferritic matrix. Phosphide eutectic in a discontinuous fashion. Mixture of type A & B along with undercooled graphite will exist towards the centre of the casting.