1. The cross section of aluminum profile itself is ever-changing, and the aluminum profile extrusion industry has developed to this day. The cross section of aluminum alloy and aluminum profile itself is ever-changing, which has important advantages such as clear fuselage and good strength. At present, many industries have adopted aluminum profiles to replace the original materials. Due to the particularity of some profiles, it is difficult to design and manufacture the die because of the special section of the profile. If the conventional extrusion method is still used, it is often difficult to achieve the rated output of the die. Only by adopting special technology and strictly controlling various production process parameters can the normal production be carried out.

2. Choose a suitable extruder for production. Before extrusion production, the size of profile section is determined according to the complexity of profile section, wall thickness and extrusion coefficient.

3. Reasonable selection of ingot and heating temperature, homogenization of ingot, and strict control of alloy composition of extruded ingot. Enterprises require ingot grain size to reach the first-class standard to enhance plasticity and reduce anisotropy. When there are gas, holes, loose structure or central cracks in the ingot, the sudden release of gas in the extrusion process is similar to "blasting", which makes the local working zone of the die suddenly unload and load again, forming a local huge impact load, which has a great influence on the die.

4. Optimize the extrusion process to prolong the service life of the die. In the extrusion production, reasonable measures must be taken to ensure the microstructure and properties of the die and adopt appropriate extrusion speed. In the process of extrusion, the extrusion speed should generally be controlled below 25 mm/s. When the extrusion speed is too fast, the metal flow will be difficult to be uniform, which will accelerate the wear of the die working zone. Reasonable selection of extrusion temperature is determined by the heating temperature of the die, the temperature of the ingot drum and the temperature of the aluminum bar. Too low temperature of aluminum bar is easy to cause the extrusion pressure to rise or the car jam phenomenon, and the die is easy to have a small amount of local elastic deformation or cracks at the stress concentration part, which leads to the early rejection of the die. If the temperature of aluminum bar is too high, the metal structure will be softened, so that the reasonable heating temperature of uneven ingot adhered to the surface of the working zone of the mold or even blocked the mold (when the mold collapses under high pressure) is 460-520°C, and that of homogenized ingot is 430-480 C.

5. Before the use of extrusion die, it is necessary to carry out a reasonable surface nitriding process for the die. It should be noted that surface nitriding can not be completed at one time, and repeated nitriding treatment must be carried out for 3-4 times during the service of the mold, and the thickness of the nitrided layer is generally required to reach about 0.15 mm. The mold cavity should be cleaned, and no alkali residue or foreign particles can remain. In general, the nitriding times of the die shall not exceed 4-5 times. It should be noted that nitriding can only be carried out after a proper production process in the early stage, and the nitriding times should not be too frequent, otherwise the working zone will be easy to delaminate.

6. The working belt must be ground and polished before the mold is put on the machine, and the working belt is generally required to be polished to a mirror surface. The working belt must be ground and polished before the mold is put on the machine. The working belt is generally required to be polished to a mirror surface, and the flatness and verticality of the working belt of the mold should be checked before assembly. The quality of nitriding determines the polishing finish of the working belt to some extent. The cavity of the die must be cleaned with high-pressure air and a brush, and there must be no dust or impurities. Otherwise, the working zone will be easily pulled by the metal flow, and the extruded profile products will have defects such as rough surface or scribing.

7. During extrusion production, the heat preservation time of the die is generally about 2-3 hours. When using the die, there should be a die support, a die sleeve and a support pad matched with the die, so as to avoid that the contact surface between the die outlet surface and the support pad is too small because the inner hole of the support pad is too large, which makes the die deformed or broken.

8. Adopt the correct alkali washing (mold boiling) method. After the mold is removed, the mold temperature is 500 C. If the mold temperature drops rapidly, the mold is prone to crack. The correct method is to place the mold in the air at 100°-150°C and then immerse it in alkaline water. After the extrusion, the extrusion rod retreats before the extrusion cylinder, and the residual pressure remains in the extrusion cylinder, and then the extrusion cylinder retreats, so that some residual aluminum in the die shunt hole can be pulled out together with the residual pressure at the same time, and then alkali cooking can be carried out.

9. The use intensity of the mold is from low to high and then to low. In the middle period of mold use, because the performance of the mold has been basically in a stable state, the use strength can be appropriately improved. At the later stage, the metal structure of the mold has begun to deteriorate, and the fatigue strength, stability and toughness have begun to enter a downward curve after long-term production and service. At this time, the service strength of the mold should be appropriately reduced until the mold is scrapped.

10. Strengthen the use and maintenance records of molds in the extrusion production process, improve the tracking records of each set of molds, and strengthen the use and maintenance records of molds in the extrusion production process for convenient management.

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