Hot Drawing and Hot Spinning
HOT DRAWING: Drawing is pulling of metal through a die or a set of dies for achieving a reduction in a diameter. The material to be drawn is reduced in diameter. Fig. 1 is another method used in hot drawing or shaping of materials where the heated blank is placed over the die opening the punch forces the blank through the die opening to form a cup or shell. The multiple dies are also used to accomplish the stages in drawing process. Kitchen utensils and components of food processing industries are manufactured by this process.
Fig. 1 Hot drawing
HOT SPINNING: Hot spinning is a process in which pressure and plastic flow is used to shape material. Spinning may be either hot or cold and is generally carried over a spinning lathe. In both cases, the metal is forced to flow over a rotating shape by pressure of a blunt tool as shown
in Fig. 2. The amount of pressure of the blunt tool against the disc controls the generated heat, which helps in forming processes.
Fig. 2 Hot spinning