Page 70 - Module DMV20173

4.0 BULK DEFORMATION PROCESSES

3) Special-purpose rolled shapes

This group includes special shape, one-piece rolled wheels, rings, balls, ribbed tube and die
rolled section.Typical applications of rolled shape are gearwheel rims, roller bearing race,
flanges, etc. as shown in Figure 5.4.

Figure 4.4 The production of a railway car wheel; (left) sequence of stages; (right) wheel
in final stag in mill.

4) Seamless tubes

This hot working process for making long, thick wall seamless tubing and pipe. It is based
on the principle that when a round bar is subjected to radial compressive force, tensile

stress develop at the center of the bar; then when subjected to cyclic compressive stress, a
cavity begin to form at the center of the bar (Figure 5.5).

Figure 4.5 The production of seamless tubes by rolling.

BPLK 102 DMV 20173