Nowadays, many industries are inseparable from the application of aluminum profiles, so in order to ensure the application effect of aluminum profiles, it is necessary to buy high-quality aluminum profiles. Because inferior industrial aluminum profiles will bring many troubles to enterprises, such as brittle aluminum profiles. Brittleness of industrial aluminum profiles will affect the production of enterprises more or less in terms of cross-sectional appearance and other aspects, and the brittleness of aluminum profiles is fully reflected in the mechanical and physical properties of products.

1. Unreasonable formula and mixing process:

1. Too much filler;

2. Type and quantity of impact modifier;

3. Too much or too little stabilizer;

4. Excessive amount of external lubricant;

5. The sequence of hot mixing, temperature setting and curing time also have decisive factors on the properties of profiles.

Second, the extrusion process is unreasonable:

1. Excessive or insufficient plasticization of materials;

2. Insufficient pressure on the nose;

3. The low molecular components in the product are not discharged;

4, screw torque is too low;

5. The traction speed does not match the extrusion speed.

Third, the mold design is unreasonable:

1. The design of die section is unreasonable, especially the distribution of internal ribs and the treatment of interface angle. This will lead to the phenomenon of stress concentration, and we need to improve the design and eliminate the right angle and acute angle at the interface.

2. For the performance degradation caused by poor confluence of shunt ribs, it is necessary to appropriately increase the length of the junction between ribs and outer surface, ribs and ribs, or increase the compression ratio to solve it.

3. Uneven discharge of die results in different thickness of profile wall or inconsistent density. Industrial aluminum alloy profile this also caused the difference in mechanical properties between the two sides of the profile. In our experiments, sometimes one side of the cold stamping is qualified and the other side is unqualified, which just proves this point.

Defects in the internal structure of aluminum will lead to rough surface of aluminum profiles produced by aluminum profile automation equipment.

Aluminum profile automation equipment is specially used to produce and process industrial aluminum profiles. After oxidation treatment, the surface of industrial aluminum profiles produced by aluminum profile manufacturers is very smooth and beautiful, and such industrial aluminum profiles are also widely used in various fields. However, many friends have seen this situation in the process of applying industrial aluminum profiles, that is, the surface of aluminum profiles has become rough, and once its surface has a rough feeling, it will affect the appearance experience of aluminum profiles! Therefore, we must know what is the reason behind the surface roughness of industrial aluminum profiles.

The surface roughness of industrial aluminum alloy profile after chemical polishing may be caused by this defect, the high proportion of nitric acid in bath solution and acid erosion, and the surface roughness may be caused by internal tissue defects of aluminum. The specific tensile strength, yield strength, ductility and corresponding work hardening rate of aluminum profiles dominate the change of allowable deformation.

If the copper content in the bath is also high, the surface roughness will be more serious. Usually, if the nitric acid content in the bath solution is too high, the chemical polishing will react violently and there will be a "boiling" phenomenon. If the nitric acid content is normal and the copper content is high, a layer of obvious characteristic color of metallic copper is attached to the surface of the washed industrial aluminum alloy profile. If the characteristic color of copper is deep, the copper content in the surface bath is high, and measures should be taken to adjust the contents of nitric acid and copper to the normal range. If the additive contains copper, it should be added less appropriately; If the copper in the bath comes from the chemical polishing of copper-containing aluminum, measures should be taken to add copper-free additives or adjust the bath.

If the surface of industrial aluminum alloy profile is rough due to internal structure defects: as-cast structure, such as cast or die-cast aluminum workpiece; Defects such as insufficient grain refinement, looseness and slag inclusion of aluminum material; The surface roughness caused by defects such as insufficient deformation and pine-like patterns in the processing process can be prevented by improving the internal quality of industrial aluminum alloy profiles.

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