Types of Moulding Flasks

Types of Moulding Flasks Points : Types of Moulding Flasks, Tapered Slip Flask, Snap Flask, Wooden Moulding Box, Box Flask or Tight Flask Different types of moulding flask are used in a foundry, some common moulding flasks are described as under. Tapered Slip Flask It is another removable type flask having rigid corners, its sides having smooth inside surface with 5 degree taper so as to allow removal of the flask upward. Snap Flask Snap flask is made with a hinge on one corner and a lock on the opposite corner so that the flask may be removed from the mould before pouring. Advantage of snap flask is that many moulds can be made from a single flask for the same pouring. The inside surfaces of the snap flask are channeled, grooved, or ribbed’ to help in holding the sand from falling out during moulding. Wooden Moulding Box It is employed for large castings required in small quantity. Its side timbers are continued beyond the ends of the box forming two handles at each end for easy handling. They are held together by strong cross-timbers, reinforced with bolts. Box Flask or Tight Flask It is remains on the mould until the pouring operation is over. They are usually made of metal and very much suited to small and medium sized moulds.