The extrusion process can be categorized into hot extrusion, warm extrusion and cold extrusion. These three forms differ in the temperatures to which metals are put through and several other factors. To make things clearer, let me start by defining the term extrusion.

What is extrusion?

Extrusion is a procedure used in metals to change them into different shapes. The resulting products are then used in several sectors such as automobile and aircraft companies. The process of transforming the metal is carried out by pushing it into a range of dies until the desired shape is attained. Machineries and devices that come in various sizes and functionalities are used to do things faster and more successfully.

What is hot extrusion?

Hot extrusion can also be known as hot working. It is the process where a piece of metal is warped or melted by applying heat higher than its recrystallization temperature.

Hot extrusion may require several sub-processes and they are drawing, forging, rolling and rotary piercing.

In drawing, tensile forces are used to expand a metal. You could do any of the following drawing forms: sheet, bar, tube or wire drawing.

In forging, localized compressive forces do the job. There are a minimum of seven most standard types and they are: drop, roll, press, upset, automatic hot, net-shape, near-net-shape, and induction forging.

In rolling, a pair or series of rolls are used where a metal stock can easily penetrate. Flat, ring, and foil rolling are just three of the usual rolling processes used today.

In rotary piercing, smooth tubing that has thick walls is made. The process has two kinds: the Stiefel process and the Mannesmann process.

What are the advantages of hot extrusion over the various other extrusion methods?

Some of the pros of doing hot extrusion are listed below:

1. The material produced via hot extrusion is more ductile than the material produced via other procedures.

2. It is much easier to perform hot extrusion since it requires less force and energy.

3. During the warp process, the pores seen in the metal are reduced in size or are completely closed up.

4. Because this process is performed at very high temperatures, chemical inhomogeneities are curtailed or are totally removed.

But, just like other things in this world, hot extrusion also has drawbacks. Here are some:

1. There might be unwanted reactions that may effect from the exposure of the metal to the atmosphere of the surroundings.

2. You may need to purchase costly devices such as an induction heater or a diesel furnace.

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