Points for Attention in the Use of Aluminum Alloy Profile Extrusion Die

(1) Use advanced instruments to detect the dimensional accuracy, hardness and surface roughness of the mold online and offline. The molds that pass the inspection and acceptance are registered, put on the shelf in the warehouse, and the polishing mold hole work belt is taken out when used, and the guide mold, profile mold, and mold pad are assembled and checked. When they are confirmed to be correct, they will be sent to the machine for heating;

(2) The heating temperature requirements before the tool and die are put on the machine: extrusion cylinder: 400～450℃, extrusion pad: 350℃, mold cushion: 350～400℃, flat die: 450～470℃, split die: 460～480℃, the holding time is calculated according to the thickness of the mould (1.5～2 minutes/mm);

(3) The heating time of the tool and die in the furnace is not allowed to exceed 10 hours. If the time is too long, the working belt of the die hole is easy to be corroded or deformed;

(4) At the beginning of extrusion of aluminum alloy profiles, pressure is slowly applied because the impact force is likely to cause mold blockage. If mold blockage occurs, stop the machine immediately to prevent the mold hole working belt from being crushed;

(5) After the mold is unloaded from the machine, it will be cooled to 150～180℃ and then put in the caustic tank to cook, because the mold is caustic boiled at high temperature, it is easy to be cracked by the impact of heat wave. And adopt advanced etching and washing methods to recover and save lye, shorten the corrosion time and realize pollution-free cleaning;

(6) When the mold repairer is assembling the split mold, the copper rod is gently hit, and it is not allowed to hit with a big hammer to avoid excessive force and shake the mold;

(7) Before the mold is nitriding, the working belt of the mold hole must be carefully polished to the surface roughness Ra0.8～0.4μm;

(8) The mold must be cleaned before nitriding, and oil stains are not allowed to be brought into the furnace; the nitriding process must be reasonable (depending on the characteristics of the equipment and the mold material), and the surface hardness after nitriding is HV900～1200, nitrogen Too thick and hard coating will cause the nitride layer to peel off. A set of molds generally allow 3 to 5 times of nitriding; complex high-power radiator profile molds do not undergo nitriding process;

(9) Nitriding treatment can be directly applied to the molds, rod molds, and round tube molds of old products without trial molds; products and complex profile molds must pass the trial molds before they can be nitrided;

(10) After the mold trial is qualified, squeeze up to 10 ingots and perform nitriding treatment on the unloader to avoid pulling the working belt out of the groove; excessive production is not allowed between the two nitriding, and the general flat mold is 60-100 ingots, 40-80 ingots for the shunt die is suitable, too much will pull through the nitride layer.

(11) After the used mold is polished, it should be kept in the greaser.