Causes of shrinkage of aluminum profile extrusion process and preventive measures

by:Zeyi     2022-01-01
Shrinkage is a unique waste product in the extrusion production process of aluminum alloy profiles. It is divided into hollow tail and ring tail. The hollow tail shrinkage is caused by the oil stains on the extruded gasket and too little extrusion residue, resulting in a serious shortage of metal supply and other reasons. , The insufficient supply of metal in the deformation zone forces the metal to produce lateral turbulence along the periphery of the extruded gasket, and the colder edges and side surfaces of the metal, which are stained with oil, flow back and become involved in the product. The ring-shaped tail is generally on the cross-section of the end of the product, and it is mostly continuous or discontinuous in the shape of a ring.  Main measures to prevent tail shrinkage:   1) Reduce the difference between the temperature of the aluminum ingot and the temperature of the tool, or use low-temperature extrusion.   2) Ensure that the surface of the ingot is clean and heated evenly.  3) It is forbidden to grease the squeeze pad or wipe the squeeze pad with oil cloth.  4) Improve the surface finish of the mold and the extrusion cylinder, and clean the extrusion cylinder in time.  5) Reduce the extrusion speed when the extrusion process is about to end.  6) Adopt lubricating extrusion and reverse extrusion.  7) Remaining residual materials and cutting tails according to regulations, or appropriately increasing the thickness of residual materials. ————The article comes from the Internet. If there is any infringement, please contact to delete it.
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