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3.0 SHEET METAL PROCESSES
8. When selected properly, rubber-forming and hydroforming processes have the
advantages of :
(a) the capability to form complex shapes;
(b) forming parts with laminated sheets of various materials and coatings;
(c) flexibility and ease of operation;
(d) the avoidance of damage to the surfaces of the sheet;
(e) low die wear;
(f) low tooling cost.
3.4.2 SPINNING
Spinning is a process which involves the forming of axisymmetric parts over a mandrel by
the use of various tools and rollers—a process that is similar to that of forming clay on a
potter’s wheel.
a. Conventional spinning
1. In conventional spinning, a circular blank of flat or preformed sheet metal is placed
and held against a mandrel and rotated while a rigid tool deforms and shapes the
material over the mandrel.
2. Fig 3.32 (a) shows the schematic illustration of the conventional spinning process. (b)
Types of parts conventionally spun. All parts are axisymmetric.
3. Although most spinning is performed at room temperature, thick parts and metals
with high strength or low ductility require spinning at elevated temperatures.
Figure 3.32 (a) The schematic illustration of the conventional spinning process.
(b) Types of parts conventionally spun.
BPLK 91 DMV 20173
