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The extrusion process can be classified into hot extrusion, warm extrusion and cold extrusion. These three kinds change in the temperatures to which metals are caused to undergo and several other factors. To make things clearer, let me start by defining the word extrusion.

What is extrusion?

Extrusion is a procedure used in metals to convert them into different shapes. The end products are then employed in several businesses such as automobile and aircraft companies. The process of transforming the metal is done by punching it into a range of dies until the preferred shape is achieved. Machineries and equipment that come in different sizes and functionalities are used so as to do things faster and more effectively.

What is hot extrusion?

Hot extrusion can also be referred to as hot working. It is the procedure where a piece of metal is warped or melted by means of heat greater than its recrystallization temperature.

Hot extrusion may include many sub-processes and they include drawing, forging, rolling and rotary piercing.

In drawing, tensile forces are used to lengthen a metal. You can do any of the given drawing forms: sheet, bar, tube or wire drawing.

In forging, localized compressive pressure do the job. There are at least seven most popular types and they include: drop, roll, press, upset, automatic hot, net-shape, near-net-shape, and induction forging.

In the process of rolling, a pair or series of rolls are used where a metal stock can pass through. Flat, ring, and foil rolling are basically three of the usual rolling processes used now.

In rotary piercing, seamless tubing that has thick walls is created. This procedure has two types: the Stiefel process and the Mannesmann process.

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

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

1. The material made via hot extrusion is more ductile compared to the material produced via other methods.

2. It is a lot easier to perform hot extrusion as it requires less force and energy.

3. During the bend process, the pores found in the metal are reduced in size or are totally closed up.

4. Because this process is performed at extremely high temperatures, chemical inhomogeneities are minimized or are totally eliminated.

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

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

2. You may need to invest in costly devices for example an induction heater or a diesel furnace.

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