The basic characteristics of positive extrusion are: relative sliding occurs between the aluminum frame of the picture frame the extrusion tube during extrusion, there is a large external friction, in most cases, this friction is harmful, it Uneven metal flow, which adversely affects the quality of the extruded picture frame aluminum, leading to uneven structure performance of the head tail, surface layer center of the extruded picture frame; increases the energy consumption of the extrusion In general, the frictional energy consumption on the inner surface of the extrusion cylinder accounts for 30-40% of the energy consumption of the extrusion, even higher; due to the strong frictional heating effect, the extrusion of aluminum aluminum alloys with low medium melting points is limited The increase in speed has accelerated the wear of the extrusion die.
What needs to be paid attention to during positive extrusion is that the sliding between the aluminum profile the extrusion cylinder during extrusion will cause a large sliding friction, this friction is conducive to the extrusion of aluminum products in most cases. Because this will make the aluminum product's moving speed constant, resulting in uneven stress on all parts of the aluminum product, the quality of the final extruded aluminum profile will be uneven; under the effect of friction alone, Friction will generate heat. As the relative speed between the extrusion of the aluminum product the mold wall will increase, the wear of the mold will also increase, the life will be reduced accordingly.
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