Recycling Process Design And Application Of Magnesium Alloy Swarf In An Enterprise

Magnesium alloy has high specific strength and rigidity,good heat transfer and vibration and noise reduction,strong electromagnetic shielding ability,resistance to organic and alkali corrosion,and greater impact load capacity than aluminum alloy.It is widely used in aerospace and automobile.Industrial,rail transit,transportation and other fields.Magnesium alloy products produce a lot of waste during processing.Magnesium alloy waste is prone to combustion and explosion,and there is a big safety hazard.Magnesium alloy enterprises now use direct remelting recovery,takeout and field ignition,etc.,with low recovery rate,easy to cause large safety hazards and waste of raw materials.With the increasing awareness of environmental protection and safety of enterprises,there is an urgent need for the recycling of magnesium alloy waste.This paper takes the magnesium alloy scrap produced in the production of a magnesium alloy processing enterprise in China as the research object.Through the research on the existing recycling process,the feasibility of remelting and solid phase recovery of magnesium alloy wastes was verified by small test,scaled test and trial production.A set of magnesium alloys satisfying AZ31 B was obtained.The processing scheme of the magnesium alloy waste recycling and recycling by the processing enterprise verified the feasibility of the magnesium alloy waste recycling system.Through experiments,design a set of diverting molds,reduce the tonnage and extrusion ratio requirements of the extruder,obtain the best equipment transformation plan and press cake process,the best remelting method and remelting process and the best solid phase regeneration process.The magnesium alloy remelted according to this process meets national standards and enterprise standards in terms of composition,current efficiency and oxides,and the recovery rate is as high as 92%.Through orthogonal test,the main factor affecting the strength of the profile is the extrusion ratio.The optimum process is preheating temperature 425 ° C,extrusion speed 4 m / min,extrusion ratio 50,mold temperature 425 ° C,and obtained.A set of process parameters.The recovery rate of clean magnesium alloy waste after treatment by solid phase regeneration technology is significantly improved,and the recovery rate of the outer round scrap is as high as 95%.The composition,current efficiency and oxide content of the solid phase recycled profiles are in line with national standards and enterprise standards,and the grain size of the profiles is only 40μm,which is significantly smaller than the profiles produced by ordinary methods.The strength is 270 MPa,which is slightly higher than that of ordinary production.Profile.By designing and implementing the magnesium alloy waste recycling system,the risk of magnesium alloy waste storage in the enterprise is solved,and the raw material cost of the enterprise is saved.After calculation,each ton of magnesium alloy waste can save 4936 Yuan,and after the project is implemented,it can save 800,000 Yuan per year for the enterprise.