Here usually block of material or metal is enclosed in a container and forced to flow through the opening of a die. During extrusion, metal is forcefully subjected to plastic deformation and as result both elongation and reduction may happen. Here the metal flowing out of the die is the product while the slug which remains in the die is not used. In direct hot extrusion, heated billet is placed in the container. In indirect extrusion, the die is fixed on the end of a hollow ram and enters container. The extrusion ratio is an important term which is defined as the cross-sectional area of the billet to the cross-sectional area of the product. Mechanical and hydraulic presses are used for extrusion.
No comments:
Post a Comment