I. Advantages of Extrusion Forming Method
1.Enhanced metal formability. Metals undergo strong triaxial compressive stress during extrusion deformation, fully leveraging their plasticity, and achieving significant deformation.
2.High overall product quality. Extrusion deformation can improve the structure of metal materials and enhance their mechanical properties, especially for some aluminum alloys with extrusion effects. The mechanical properties of extruded products in the longitudinal (extrusion direction) are much higher than those produced by other processing methods after quenching failure.
3.Wide product range. Extrusion processing can produce not only simple cross-sectional shapes like pipes, rods, and wires but also complex solid and hollow profiles with gradually changing cross-sections along the length.
4.Great production flexibility. Extrusion processing has a high degree of flexibility. It only requires changing the molds to produce products with different shapes, sizes, specifications, and varieties on the same equipment. The operation of changing the working molds is simple, convenient, time-saving, and efficient, making it suitable for the production of materials with multiple varieties, specifications, and small batches.
5.Simple process flow and low equipment investment. Compared to processes like piercing rolling and hole-type rolling for pipe and profile production, extrusion production has the advantages of a short process flow and low equipment and quantity investment.
II. Disadvantages of Extrusion Forming Method
1.Non-uniform product structure and properties. Due to the uneven flow of metal during extrusion (especially severe without lubrication in direct extrusion), extruded products exhibit non-uniformity in surface and center, as well as the head and tail regarding their structural properties. Particularly, aluminum alloy extruded products like 6A02, 2A50/2A70, etc., exhibit significant grain coarsening in the surface layer after heat treatment, forming a thick-grain ring.
2.Harsh working conditions for extrusion dies and high die wear.
3.Relatively low production efficiency. Except for the continuous extrusion method developed in recent years, conventional extrusion methods cannot achieve continuous production.
4.Significant geometric waste loss. After each extrusion, there remains extrusion residue (or extrusion surplus) and scraps such as the heads and tails of cut products, resulting in geometric waste amounting to 10%-15% of the ingot weight.
Post time: Oct-17-2023