Extrusion Process Overview Aluminum Extrusion（铝型材挤压过程概述）.pdfVIP

Extrusion Process Overview The aluminum extrusion process really begins with the design process, for it is the design of the product – based on its intended use – that determines many of the ultimate production parameters. Questions regarding machinability, finishing, and environment of use will lead to the choice of alloy to be extruded. The function of the profile will determine the design of its form and, hence, the design of the die that shapes it. Once the design questions have been answered, the actual extrusion process begins with billet, the aluminum material from which profiles are extruded. The billet must be softened by heat prior to extrusion. The heated billet is placed into the extrusion press, a powerful hydraulic device wherein a ram pushes a dummy block that forces the softened metal through a precision opening, known as a die, to produce the desired shape. This is a simple diagram of a typical horizontal hydraulic extrusion press; the direction of extrusion here is from left to right. That is a simplified description of the process known as direct extrusion, which is the most common method in use today. Indirect extrusion is a similar process