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Casting Manufacturing Processes

  1. BASICS OF MANUFACTURING PROCESSES Amritansh Manthapurwar II-Year, Mech Dept. III-SEM, Sec-A, Roll no-09
  2. Introduction to Casting Process ● Casting Process is the most widely used Manufacturing Process in the Industries. ● Products of varied sizes, from small to very large can be manufactured using this process. ● Some examples of items manufactured using Casting Process include Engine blocks, Machine tool bases, Cylinder heads, Pump housings, Valves, etc.
  3. Pattern in Casting Process ● It is a replica of the object to be made. ● Mould Cavity is made with the help of Pattern. ● They are usually made from Wood, Plastic, Sugar Pine and Wax.
  4. Types of Pattern ● Single Piece Pattern ● Two Piece Pattern ● Multi Piece Pattern ● Match Plate Pattern ● Gate Pattern ● Skeleton Pattern ● Sweep Pattern ● Loose Piece Pattern ● Cope and Drag Pattern ● Shell Pattern
  5. Pattern Allowances ● Difference in dimensions of Pattern and Casting are due to Allowances. ● Allowances are provided to avoid any damage to the Mould Cavity and desired Casting Product is obtained. ● It gives a compensation to the drawbacks of the Casting Process.
  6. Types of Pattern Allowances ● Shrinkage Allowance ● Draft Allowance ● Machining Allowance ● Distortion Allowance ● Rapping Allowance
  7. Core in Casting Process ● Cores are compact mass of core sand used to produce hollowness in casting. ● The core is placed inside the mould cavity, at the right location and proper alignment. ● It can also be used to strengthen the mould. ● Cores are placed on the extra projections on the pattern called the Core Prints. ● Sometimes cores are placed with Chaplets that provide adequate support to and avoid it from sagging. These Chaplets are made from same material as that of the Casting.
  8. Types of Cores in Casting ● Horizontal Cores ● Vertical Cores ● Balanced Cores ● Hanging Cores ● Cover Cores ● Wing Cores
  9. Classification of Casting Casting Processes Expendable Mould Casting Permanent Mould Casting (e.g Die casting, Centrifugal casting, Continuous casting) Permanent Core (Metal core) Semi-Permanent Core (Sand core) Expandable Pattern (e.g Investment casting) Permanent Pattern (e.g Sand casting)
  10. Gating Systems ● To provide continuous, uniform feed of molten metal into mould cavity and to reduce the turbulence flow. ● Proper directional solidification. ● To fill the mould cavity in a less time to avoid thermal gradient. ● To provide minimum excess metal, and erosion of mould walls.
  11. Elements of Gating System ● Pouring basin ● Sprue ● Sprue Base ● Runner ● Gate ● Riser
  12. Elements of Gating System POURING BASIN : ● It is the conical hollow element or tapered hollow vertical portion of the gating system. ● It makes easier for the ladle operator to direct the flow of molten metal from crucible to pouring basin and sprue. ● It helps in maintaining the required molten metal flow. ● It reduces turbulence and vortexing at the sprue entrance.
  13. Casting Defects A Casting Defect is an undesired irregularity in a metal casting process. Some defects can be tolerated while others can be repaired, otherwise they must be eliminated. Types of Casting Defects are: 1) Gas Porosity 2) Shrinkage defects 3)Mould material defects 4) Pouring metal -defects 5) Metallurgical defects
  14. Moulding Process ● Moulding is a manufacturing process that involves shaping a liquid or malleable raw material by using a fixed frame. ● The mould is obtained from the initial pattern or template of the desired object. ● Then, multiple copies of the final product are produced using that mould. ● As the liquid cools and hardens inside the mould, the final product is obtained. It’s removal is facilitated by release agents or ejection pins.
  15. Moulding Sand It is used for preparing Mouldings for the Manufacturing Processes. Constituents Of Moulding Sand are: ● Silica Sand ● Binder ● Moisture ● Additives
  16. Properties of Moulding Sand ● Refractoriness ● Permeability ● Cohesiveness ● Green Strength ● Dry Strength ● Flowability or Plasticity ● Adhesiveness ● Collapsibility
  17. Types of Moulding Sand ● Green Sand ● Dry Sand ● Facing Sand ● Backing Sand ● Parting Sand ● Core Sand
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