Types of extrusion pdf

The setup of backward extrusion consists of a die, ram, billet work material and the container similar to forward extrusion process. In Backward extrusion, the direction of the movement of Ram and the extruded component is in the opposite direction. In the case of Backward extrusion, the raw material can deform directly and the flow takes place through a die opening, and the required shape of the component can be obtained.

This is the detailed explanation of the Extrusion Process. If you have any doubts, notify us so that we can solve it soon. From what I can see the material comes out as a closed solid. How is a hollow tube created from this? Your email address will not be published. Notify me when new comments are added. Most die…. In this article, we are going to discuss a detailed presentation on the Rolling Process with its Principle, Working,…. Topics of Today. What is Extrusion Process?

Since the chamber is closed on all sides, the heated material is forced to squeeze through the die-opening in the forms of a long strip of the required cross-section. The process seems simple but the friction between the material and the chamber walls should be overcome by suitable lubrication. When extruding steel products, the high temperature to which the steel has to be heated makes it difficult to find a suitable lubricant.

The problem is determined by applying molten glass as a lubricant. When the lower temperature is used, a mixture of oil and graphite is used as a lubricant. The arrangement is done as given in the fig. The block of heated metal is inserted into the chamber.

It is enclosed on all sides by the container walls except in front Where a ram with the die presses upon the material. When the ram presses backwards, the material has to flow forwards through the opening in the die. The ram is formed hollow so that the bar of extruded metal may pass over it unhindered. This process is called a backward extrusion process as the flow of material is in a direction opposite to the movement of the ram.

In the forward extrusion process the flow of material and ram movement where both in the same direction. With the help of extruders and extrusion machines, the process of cold extrusion is carried out at room temperature or at moderately high temperatures. The cold extrusion can also be described as the method of shaping a cold metal by striking a slug.

This strike is performed with a punch in a closed cavity , which pushes the metal in an upward direction around the punch. This process is also called cold pressing, cold forging, extrusion pressing, and impact extrusion.

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Learn how your comment data is processed. Extrusion Process and Types Contents show. Extrusion Process and Types. Working of Extrusion Process. Types of Extrusion 3. Hot Extrusion. Types of Hot Extrusion. Cold Extrusion. Types of Cold Extrusion. Advantages of Extrusion. Disadvantages of Extrusion.