The importance for nitriding process on aluminum extrusion die
The importance for nitriding process on aluminum extrusion die
Aluminum extrusion die manufacturing process, extrusion die process is generally as follows:Put forward the mold task (profile drawing). Die design for forging blank, annealing and extrusion. Then Turning procedure check coarse grinding plane, crossed through NC program tape or tape. Drilling and milling test the electrode machining EDM and Heat treatment line cutting process. Inspection and correction of grinding, Extrusion honing, mold testing and fixing the nitriding treatment.
Nitriding process:The main process parameters of gas nitrocarburizing are nitriding temperature, nitriding time, and nitriding atmosphere.The gas soft nitriding temperature is usually 560-570 DEG C, because the nitrided layer has the highest hardness at this temperature. The nitriding time is usually 3-4 hours, because the hardness of the compound layer reaches the maximum at 2-3 hours after penetration, while the depth of the nitrided layer increases slowly with time. The nitriding atmosphere is determined by the rate of ammonia decomposition and the rate of dripping of the carbonaceous penetrant.
After nitriding treatment,it can improve die surface hardness to reduce hot abrasion.But on the die surface,nitriding treatment is not finished in one time,normally during die working life 3-5times nitriding treatment is needed,and the nitriding thickness is about 0.15mm.
(Remarks:The nitriding treatment is under well processing,nitriding time should be not frequent，otherwise the bearing will be delaminating)
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