The following points highlight the four main types of extrusion processes. The types are: 1. Direct Extrusion 2. Indirect Extrusion and Impact Extrusion 3. Hydrostatic Extrusion 4. Continuous Extrusion. Type # 1. Direct Extrusion: In direct extrusion the motion of press ram and that of extrude are in the same direction. The billet smeared with lubricant is put in a [...]
Several methods of analysis have been applied for determining the punch pressure in direct extrusion. These are as follows: (i) Slab method. (ii) Slip line method. 1. Slab Method: For small die angles, the slab method already discussed in case of wire drawing may be applied to extrusion as well. The metal flow in both the wire drawing and extrusion [...]
In this article we will discuss about:- 1. Definition of Extrusion 2. Ways to Extrude Metals 3. Characteristics 4. Forces 5. Design Considerations 6. Extrusion Speeds, Temperatures and Pressures. Definition of Extrusion: Extrusion is defined as the process of pushing the heated billet or slug of metal through an orifice provided into a die, thus forming an elongated part of [...]