Abstract: The necessity of cooling quickly large-size aluminum profiles extruded is analyzed. Based on the typical large-size aluminium profiles cooling velocity curve, the technical requirements for the quench process of large size profiled aluminum profiles is put forward. On base of thermal conduction theory, equations to calculate the quantity of cooling medium for large-size aluminium profiles quench are gained. And the corresponding foundation for fast cooling is established. Several fast cooling methods in common use are introduced. The technical characteristics of air-water combined quench are analyzed. On the foundation of large-size aluminium profiles quench theoretic, the technical process route for large-size alu-minium profiles air-water combined quench is also put forward. Further the new and effective air-water combined quench equipment is developed. The experiment is carried out on the new quench. Experiment shows that the theoretic foundation for large-size aluminium profiles fast cooling is correct and the technical process route is reliable. The new quench equipments are used in several large-size aluminium extrusion line, which makes it to greatly improve the quality of the large size alumi-num profiles.

Key words: Aluminium profile, Extrusion, Fast-cooling and air-water combined quench, Quench