Knowledge about Aluminum extrusion die （二）

6. When assembling the divergent die, the worker should apply the copper rod to gently beat it upside down, and it is not allowed to hit it with a large hammer to avoid excessive force and shock the mold

7. Before nitriding of the aluminum extrusion die, the mold hole working belt should be carefully polished to the surface roughness Ra0.8~0.4μm;

8. Aluminum profile extrusion mold should be cleaning before nitriding, no oil. The nitriding process should be reasonable (depending on the characteristics of the equipment and the mold material), the surface hardness after nitriding is HV900~1200, and the nitriding layer is too thick and too strong, which will cause the nitriding layer to peel off. A set of molds generally allows nitriding 3 to 5 times; Complex high-magnification radiator profile molds no need to nitriding.

9. The new mold, bar mold and round tube mold of the old product can be directly nitrided without trying the mold; the new product and complex profile mold must be qualified before the nitriding treatment can be carried out;

10. The aluminum extrusion new molds should be unlocaed for nitriding treatment to avoid pulling the working belt out of the groove after extruding max 10 sets ingots. Between the two nitriding can not be overproduced, the general flat mold is 60 ~ 100 ingots, the shunt mold is 40 ~ 80 ingots is appropriate, too much will pull through the nitriding layer.

11. After using of aluminum profile extrusion mold polishing, oiler storage.