On the other hand, in the indirect extrusion process the billet is. Direct extrusion forward extrusion,indirect extrusion process information, working process of direct and indirect extrusion,disadvantages of direct and indirect. Hydrostatic extrusion in hydrostatic extrusion, the billet is smaller in diameter than the chamber which is filled with a fluid, and the pressure is transmitted to the fluid by a ram. Direct extrusion,indirect extrusion process,direct extrusion process. Extrusion processdirect extrusionindirect extrusionimpact extrusion extrusion analysis bar drawing wire drawing drawing analysis dr. Indirect extrusion article about indirect extrusion by.
This is because of the introduction of frictional forces due to the requirement for the billet to move the containers entire length. The indirect extrusion simulation for the optimization of process parameters dealt with in this paper is thus found to be new and the simulationbased approach is found to be novel in the area. Buyer is not positive that direct indirect is the correct process, so is depending on supplier to make that determination. Pdf comparative analysis of extrusion processes by finite. Direct extrusion is the most common method in use today.
Metal extrusion process and their application techminy. Direct extrusion is a similar metal extrusion process to the one illustrated in figure 208. Less force than direct extrusion, less friction than direct extrusion. Such an approach is found to provide quick and efficient solution to extrusion problems. May 17, 2018 direct extrusion versus indirect extrusion. Pdf product defects in aluminum extrusion and their impact. During the direct extrusion process, the surface of the billet slides along the. No friction works between the metal billet and the container walls since the billet does not move the container. Advantages and disadvantages of direct and bowden extrusion. Extruding of aluminium and aluminium alloys the extrusion. The direct mode process works like a playdoh factory. Indirect or backward extrusion this process is similar to direct extrusion except that the extended metal is forced out through a hollow ram.
In the mixer the raw materials are mixed and brought to the desired moisture level. Direct extrusion or inline compounding makes it possible to produce semifinished products such as films, plates, tubes or profiles in one process step. Buyer needs these extruded, machined, polished and anodized. Two extrusion methods are in use, direct extrusion and indirect extrusion. The investment is likely to be completed by april 2016 and include a new casthouse, a new indirect extrusion press line for production of hard alloy bars and profiles, a new drawing line, and a complete refurbishment of an existing extrusion line to meet increased demand for drawn bars. Direct extruders, as the name implies, are directly attached to the hot end and are a part of the print head. Direct extrusion is also called forward extrusion and it is the most general extrusion process. What are the differences between a direct and an indirect. Machine 212 secondhand indirect type copper extrusion press maker. Extrusion process and its types by basic engineering youtube. The two main advantages of this process over other manufacturing processes are its ability to create very complex crosssections, and to work materials that are brittle, because the material only encounters compressive and shear stresses. In direct, or forward extrusion, the work billet is contained in a chamber.
Indirect hot, warm and cold solid, hollow and semihallow parts continuous vs. Pdf a study on metal extrusion process researchgate. Indirectextrusion rfqs get online quotes from suppliers. It is heated to a required temperature and then it is transferred inside a chamber as shown in fig. A 25 to 30% reduction in load compared with direct extrusion. Extrusion is a manufacturing process used to create objects of a fixed crosssectional profile. This paper we only discuss on the direct extrusion process. Producing extrusion products particularly economically through the combination of a variety of process steps this is direct extrusion. Pdf product defects in aluminum extrusion and their. Direct extrusion article about direct extrusion by the.
Us20150174630a1 direct or indirect metal pipe extrusion. The extrusion process is demonstrated hot, warm, and cold extrusion processes are explained direct, indirect, combination, and impact extrusion is shown plastic extrusion processes are detailed the extrusion process extrusion is a method of forming in which metals or. Extrusion is a process used to create objects of a fixed crosssectional profile. Direct extrusion the driven ram and the extruded part move in the same direction. The hollow shape ram is used in this extrude method. There is the simplest production of aluminum extrusion process, which can be carried out without lubricant. Extrusion is a plastic deformation process in which a block of metal. Indirect extrusion is a similar process, but with some important differences. Direction extrusion, indirect extrusion, impact extrusion, hydro static extrusion and tube extrusion are explained in video. Apr 28, 2017 today we will learn about extrusion process working, types, application, advantages and disadvantages. It may be either direct or indirect extrusion and it is usually performed on a high. Direct extrusion article about direct extrusion by the free.
Extrusion process types, advantages, disadvantages. Forward and direct extrusion are the two different names of the same process. Today we will learn about extrusion process working, types, application, advantages and disadvantages. Indirect extrusion, also called backwardreverse extrusion, as shown in figure 2 b, is characterized by no friction between the billet and container wall.
Direct extrusion,indirect extrusion process,direct. The impact extrusion manufacturing process is very effective at forming flanges on tubular parts. Flanges with varying diameters and geometric attributes may be formed along the length of the extruded metal section. In the previous blog on direct extrusion, we had pointed the main disadvantage of direct extrusion being the excess use of force due to friction between the cylinder and billet. Backward and indirect extrusion are the two different names of the same process. Figure 1 shows the principle of direct extrusion where the billet is placed in the container and. The most common method of extrusion, known as direct extrusion, can also be referred to as forward extrusion. It may be either direct or indirect extrusion and it is usually performed on a high speed mechanical press. Dec 14, 2017 this video is all about extrusion process and its types. Bharat industries blog indirect or backward extrusion.
Indirect extrusion article about indirect extrusion by the. The mix is then transferred to the extruder hopper by means. This video is all about extrusion process and its types. The difference between direct and bowden extruders is the location of the extruder in relation to the hot end. With the help of above hierarchy diagram, we can easily understand types of various extrusion processes. Indirect extrusion an overview sciencedirect topics. Its work operation includes the placement of the billet in a container, which is heavily walled. Do you know when to use the indirect extrusion process. The process of extrusion, in the case of acb extrusion press loire, 1976 of 2500 tonsforce arround 24. In the production, for example, of panels of wood flourpp, acoustic and insulation filmspanelspipes using baso 4 or even in the production of thermoforming films and biaxially oriented films, the intermediate step of pellet production is foregone as a result.
Tubular parts with multiple diameter holes cylinder, conical, stepped or tapered diameter solid shaft and other nonround shape. The indirect extrusion operation principle same as direct extrusion process. Casexpert a process planning system with feature based. Dec 17, 2014 suranaree university of technology janmar 2007 hot extrusionhot extrusion the principal variables influencing the force required to cause extrusion.
The investment and operating costs and the energy requirements of the production process drop as a result. The most important and principle method used in extrusion is the direct process as shown in figure 1, which follows the step. Inline compounding comprises a very complex production process in which the. In this process, the material to be extruded is in the form of a block. This process is extensively used in pipes and steel rods manufacturing. Please provide further detail of the differences between direct and indirect extrusion. Types of extrusion process working, application, advantages. When direct extrusion makes sense the process offers great opportunities to extrude a better product at less cost, but its not for everyone. Mar 24, 2019 forward and direct extrusion are the two different names of the same process. In direct extrusion a solid ram drives the entire billet. There are many classifications for the extrusion processes, it may classify depending on the extrusion direction as direct and indirect another classification is by working temperature as cold or warm or hot extrusion.
Buyer is not positive that directindirect is the correct process, so is depending on supplier to. Direct extrusion,indirect extrusion process,direct extrusion. In practise, two types of extrusion presses are employed, namely, the direct and indirect extrusion press. The he process is a particular direct extrusion method and due to the crucial role of a liquid medium, is sometimes called hydraulic direct extrusion. Direct extrusion indirect extrusion hydrostatic extrusion including the thick film process special processes, e. This work presents a comparative study of extrusion processes solid. Disadvantages of direct extrusion one of the major disadvantages of the direct extrusion process is that the force needed for the extrusion of billet is more than what is required in the indirect extrusion process. Thus, the indirect extrusion has many technical advantages as follows. Suranaree university of technology janmar 2007 hot extrusionhot extrusion the principal variables influencing the force required to cause extrusion.
The two basic types of extrusion are direct and indirect, which are commonly. Some products can only be manufactured using singlestage direct extrusion. A great decrease of extrusion load compared with direct extrusion, thus for a certain extrusion equipment, smaller cross sections can be extruded under lower billet. Bosses and hollow tubes, concentric to the extrusion axis, can be formed within hollow metal tubes by impact extrusion. Indirect extrusion the extrusion process extrusion is a plastic. The advantages of indirect extrusion are partly related to the lower load needed and partly to the more uniform flow pattern developed because of the absence of relative motion between the billet and the container i. Accordingly, to deal with this issue, whenever possible one can use indirect or backward extrusion, wherein comparative lesser force is required for extruding the material. The intermediate pelletizing typical for plastics and other products is omitted in inline compounding.
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