The Hot Extrusion Process - The Way It Works And Its Sub-Processes

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

What is extrusion?

Extrusion is a method used in metals to transform them into different forms. The final products are then utilized in several industries such as automobile and aircraft companies. The process of transforming the metal is carried out by pushing it into a number of dies until the required shape is attained. Machineries and tools that come in different sizes and functionalities are used in order 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 bent or melted by using heat higher than its recrystallization temperature.

Hot extrusion may involve various 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 kinds: sheet, bar, tube or wire drawing.

In forging, localized compressive pushes do the job. There are a minimum of seven most common types and they include: 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 popular rolling processes used currently.

In rotary piercing, smooth tubing that has thick walls is formed. This technique 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 given below:

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

2. It is much simpler to perform hot extrusion because 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 carried out at quite high temperatures, chemical inhomogeneities are curtailed or are totally eradicated.

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

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

2. You may need to purchase costly equipments like an induction heater or a diesel furnace.

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