Investment Casting

WAX INJECTION - Investment Castings process starts with production of wax patterns by injecting wax in to dies. A pattern is required for each castings. Wax patterns have exact dimensions of the required finished castings, subject to shrinkage etc.
   
PATTERN ASSEMBLE - Wax patterns are then assembled to one or more runners and then runners are attached to pouring cups. This assembly when completed is called tree or cluster.
   
SHELLING - This process involves dipping the tree or cluster in to different types of ceramic slurry, draining it then again coating. This process is repeated until desired shell thickness is achieved.
   
DEWAXING - The coated cluster is placed in a high temperature furnace where the pattern melts and runs out through the gates, runners and pouring cu. This leaves a ceramic shell containing cavities of the casting shape desired with passages leading to them.
CASTINGS - Before pouring molten metal, shells are fired to burn out residual wax, and to give desired strength in shells, so as to bear pressure & heat at the time of pouring. Moulds may be poured with help of vaccum, pressure or centrifugal force.
   
CLEANING & FETTLING - Ceramic slurry is then removed by knocking or by abrasive blastings.Each casted component is then removed by either plasma cutting torch or by cutt off wheels.
   
FINISHING & DISPATCHING - Each component is then cleaned through gates etc by grinding and then polishing by Shot/Sand blastings.Castings is then ready  for final inspection and dimensional check etc.After this process is completed castings are then ready for dispatching.
   

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