Page 89 - Module DMV20173

4.0 BULK DEFORMATION PROCESSES

Example 4.3

Explain why cold extrusion is an important manufacturing process and give its advantages
over hot extrusion.

Solution:

Cold extrusion is an important because:

Cold extrusion is capable of economically producing discrete parts in various shapes
with good mechanical properties and dimensional tolerances.

The advantages of cold extrusion over hot extrusion are:
i) Improved mechanical properties resulting from work hardening.
ii) Good control of dimensional tolerances.

iii) Improved surface finish.
iv) Production rates and costs that is competitive with those other
methods of producing.

EXERCISE 4.3

Identify the factors that control the efficiency of metal extrusion.

SUMMARY
In this chapter we studied that:

1. rolling is the process of reducing the thickness or changing the cross-section of a

long strip by compressive forces applied through a set of rolls;

2. in addition to flat rolling, shape rolling is used to make products with various cross-

sections;

BPLK 121 DMV 20173