How to improve the quality of aluminum profile extrusion machine die

In actual production, some molds often fail to reach the predetermined output during extrusion processing by aluminum extrusion machine, so that the molds made of expensive mold steel are far from reaching their due value. Many aluminum profile manufacturers in my country have this problem. This not only causes a lot of economic losses, but also wastes energy. To solve this problem, I give the following suggestions:

1. In the early stage of extrusion die use, a reasonable surface nitriding treatment process must be carried out on the die. Surface nitriding treatment can greatly improve the surface hardness of the mold while maintaining sufficient toughness, so as to reduce the thermal wear of the mold during use. It should be noted that the nitriding of the surface cannot be completed at one time. During the service period of the mold, repeated nitriding treatment must be carried out 3-4 times. Generally, the thickness of the nitriding layer is required to reach about 0.15mm.

2. The use intensity of the mold is from low to high and then to low. When the mold first enters the service period, the performance of the internal metal structure is still in the floating stage. During this period, a low-intensity operation plan should be adopted to make the mold transition to a stable period.

3. During extrusion production, the mold holding time is usually about 2-3 hours, and it must not exceed 8 hours, otherwise the hardness of the nitriding layer in the working belt of the mold will decrease, which will cause the surface of the profile to be rough due to non-wear resistance when it is put on the machine. Serious ones will cause defects such as scratches.

4. The working belt must be ground and polished according to strict requirements before the mold is put on the machine. The quality of nitriding determines the smoothness of the work belt polishing to a certain extent. Check the flatness and verticality of the mold working belt before assembly. The mold cavity must be cleaned with high-pressure air and a brush, and there must be no dust or foreign matter, otherwise it is easy to damage the working belt driven by the metal flow, so that the extruded profile product has defects such as rough surface or scratches.

5. Strengthen the use and maintenance records of the molds in the extrusion production process, and improve the tracking record files and management of each set of molds. From the inspection of the extrusion die to the scrapping of the die after use, the intermediate time can be as short as a few months and as long as more than a year. Basically, the use records of molds also record the various processes of profile production.

6. Use the correct alkali washing (cooking mold) method. After the mold is unloaded, the temperature of the mold is above 500°C at this time. Do not act too hastily at this time. After the mold is unloaded, the mold must be placed in the air at 100°-150°C before immersing in alkaline water.

7. Optimize the extrusion process. In order to prolong the life of the mold scientifically, the reasonable use of the mold for production is an aspect that cannot be ignored. Due to the extremely harsh working conditions of extrusion dies, reasonable measures must be taken in extrusion production to ensure the organizational properties of the dies.