(1) Use the advanced instrumentation to detect the dimensional accuracy, hardness and surface roughness of the mold on-line and off-line. Inspection and acceptance of qualified molds for registration, the library on the shelves, when used to lead out the work of polishing die hole, and diversion die, profile mold, mold pad assembly inspection, confirmed when sent to the machine heating;
(2) molds on the machine before the heating temperature requirements: extrusion cylinder: 400 ~ 450 ℃, extrusion pad: 350 ℃, mold pad: 350 ~ 400 ℃, die: 450 ~ 470 ℃, shunt mold: 460 ~ 480 ℃, the insulation time according to the thickness of the mold (l.5 ~ 2 minutes / mm);
(3) mold in the furnace heating time is not allowed more than 10 hours, the time is too long, die hole work zone easy to corrosion or deformation;
(4) in the aluminum alloy extrusion start stage, the need to slowly increase the pressure, because the impact is likely to cause blockage. If the occurrence of blockage, the need to immediately stop to prevent the pressure die hole work belt;
(5) mold unloading machine, to be cold to 150 ~ 180 ℃ and then put the alkaline cooking, because the mold at high temperature alkali cooking, easy to heat shock impact cracking. And should adopt advanced etching method to recover the savings of lye, shorten the corrosion time and achieve pollution free cleaning;
(6) repair workmanship in the split-mode assembly, the application of copper rods gently hit, do not allow big hammer hit, to avoid excessive force, badly die mold;
(7) mold nitriding before the need to work carefully with the hole to the surface roughness Ra0.8 ~ 0.4μm;
(8) mold nitriding before the need for clean, do not allow oil into the furnace; nitriding process to be reasonable (depending on the device characteristics and mold material may be), after the surface hardness of HV900 ~ 1200, nitride layer Thick, excellent will cause the nitride layer peeling. A set of molds generally allow nitriding 3 to 5 times; complex high power tooth radiator profiles do not carry out nitriding process;
(9) on the old product of the new mold, rod mold, tube mold can be directly without the test of nitriding; new products and complex mold must be tested after the qualified to nitriding;
(10) the new mold test qualified, the maximum extrusion of 10 ingots should be unloading machine for nitriding, to avoid pulling the work belt trench; between the two nitriding can not be over-production, the general flat for the 60 ~ 100 ingots, shunt mold for 40 to 80 ingots is appropriate, too much will pull through the nitride layer.
(11) after the use of the mold after polishing, oil tanker storage.
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