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Casting Processes (Expendable mold (Sand casting (Sand Requirement…

- - - - Metal
      - Hard plastic
      - Wood
    - - Collapsibility
      - Permeability
      - Cohesiveness
      - Refractoriness
    - - Hand Ramming
      - Molding Machine
- - - - Frequently cast metal
        
        Lead and its alloy
        
        Magnesium and its alloy
        
        Advantages
        
        Reusable molds
        
        Good Surface finish
        
        Little finish machining
        
        Types of permanent mold
        
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        Consistent dimension
        
        Near net shapes
        
        Directional solidification
        
        Disadvantages
        
        High mold cost
        
        Molds are not permeable
        
        Limited to lower melting temperature alloy
        
        Limited mold complexity
        
        Copper and its alloy
        
        Aluminum and its alloy
        
        Steel or iron ( mold : Graphite)