1.How would you produce the parts shown in Fig. 7.35b other than by tube hydroforming?

By the student. The part could be produced by welding sections of tubing together, or by a

suitable casting operation. Note that in either case production costs are likely to be high and production rates low.

2. Give three examples each of sheet metal parts that (a) can and (b) cannot be produced by

incremental forming operations. By the student. This is an open-ended problem

that requires some consideration and creativity on the part of the student. Consider, for example: (a) Parts that can be formed are light fixtures,

automotive body panels, kitchen utensils, and hoppers.

(b) Incremental forming is a low force operation with limited size capability (limited

to the workspace of the CNC machine performing the operation). Examples of parts

that cannot be incrementally formed are spun parts where the thickness of the sheet

is reduced, or very large parts such as the aircraft wing panels in Fig. 7.30 on p. 372.

Also, continuous parts such as roll-formed sections and parts with reentrant corners

such as those with hems or seams are not suitable for incremental forming.