Extrusion Profiles Variety And Specifications
Extrusion Profiles Variety and specifications
The process of producing profiles by extrusion. Extruded profiles of hollow sections and solid profiles of two categories. Hollow profile refers to a cross section with one or more closed through-hole profiles. Extruded profiles and specifications of more than 30,000 kinds, especially for the most aluminum, up to 24,000 species. Followed by copper profiles, magnesium profiles and steel and plastic profiles. Solid extrusion profiles account for about 65% of the total extruded profile specifications, while the profiled section profiles account for the majority of the solid section profiles, followed by hollow extruded profiles such as aluminum doors and windows profiles, plastic door and window profiles. Compared with other methods such as rolling, forging for the production of profiles compared to the high strength of extrusion profiles. Extrusion tool replacement is relatively simple, can be small batch production. The use of extrusion method to produce complex shape products, especially the large changes in cross-products, can greatly reduce the amount of mechanical processing, reduce metal losses, improve the use of parts and structure performance.
Extruded solid profiles are mainly used for extrusion, reverse extrusion and joint extrusion. Joint extrusion method is currently not much use. The extrusion of the hollow profile can be based on the shape of the hollow profile, the number of holes (the cross-sectional shape and size of the hole when the single hole is extruded), the degree of asymmetric distribution of the hole to the center of the section and other factors, And the welding extrusion method (see the combination die extrusion). The former is made of hollow ingot or solid ingot for positive or reverse extrusion; the latter is suitable for positive extrusion of metals and alloys with good weldability, especially when extruded aluminum alloy construction profiles Extensive application.
In the choice of extrusion method, according to the profile shape, extruder structure, the number of residues and the separation of the same material with the method, the cylinder volume utilization factor, profile quality requirements (wall thickness, inner surface quality and macrostructure ), Stress conditions and metal flow rate and other indicators, do a comprehensive trade-off, select the best extrusion method. The production of porous profiles, the hole diameter is very small profiles; hole position distribution is very asymmetrical profiles and the shape of the hole complex shape, can not use perforation needle method. Aluminum alloy, brass, bronze, copper, copper, titanium, zirconium, steel and other hollow profiles can not be used to weld the aluminum alloy, brass, bronze, white copper, titanium, zirconium, steel and other hollow profiles can not be used welding Coextrusion method.
The profile extrusion process mainly includes billet size selection, extrusion temperature determination, metal flow rate determination, process development, lubricant and application options. Extruded profiles are made of solid circular cross-section billet, only in the extrusion of the hole shape is simple, large size of the hollow section when the use of hollow circular cross-section billet. The size of the billet determines the quality of the profile and the technical and economic indicators of the extrusion process. When selecting the billet, the size of the billet should be maximized to increase the yield. In the use of several different sizes of extrusion cylinder, it is appropriate to use the smallest diameter billet. The temperature range of the extrusion of the profile, the size of the metal flow, the type of lubricant and the lubrication method are the same as the steel pipe extrusion.