The Hot Extrusion Process - How It Is Carried Out And What Are Its Sub Activities

The extrusion process can be grouped as hot extrusion, warm extrusion and cold extrusion. These three kinds vary in the temperatures to which metals are exposed to and several other aspects. To make things clearer, let me start by describing the term extrusion.

What is extrusion?

Extrusion is a method used in metals to change them into different shapes. The resulting products are then employed in several sectors such as automobile and aircraft firms. The process of transforming the metal is carried out by pushing it into a range of dies until the preferred shape is attained. Machineries and tools that come in different sizes and functionalities are used to do things easier and more effectively.

What is hot extrusion?

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

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

In drawing, tensile forces are used to stretch a metal. You could do any of the given drawing types: sheet, bar, tube or wire drawing.

In forging, localized compressive forces do the job. There are at least seven most standard 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 number of rolls are used where a metal stock can go through. Flat, ring, and foil rolling are simply three of the popular rolling processes used now.

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

What are the benefits of hot extrusion over the other extrusion methods?

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

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

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

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

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

But, just like other things in this world, hot extrusion also has disadvantages. 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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