The parts having circular cross-section can be made by spinning from thin sheet metal. The principle of metal spinning is that a heated circular blank of sheet metal is lightly held against a chuck by the pressure of a freely rotating pad on the lathe tail stock. A rounded stick or roller is pressed against the revolving piece and moved in a series of sweeps as shown in Figure 21.27. This displaces the metal in several steps to conform to the shape of chuck. Once the operation is started considerable frictional heat is generated which aids in maintaining the metal at a plastic state.
Figure 21.27 Hot Spinning
Leave a Reply