Causes and analysis of brittle aluminum profiles

by:Zeyi     2021-07-12
The brittleness of aluminum profiles has always been a factor that plagues the normal operation of some aluminum profile companies. The brittleness of profiles has more or less affected the market share and User reputation.   The brittleness of aluminum profiles is basically fully reflected in the physical and mechanical properties of aluminum products. Its main characteristics are: breakage and rupture during cold punching during blanking. Of course, there are many reasons for the poor physical and mechanical properties of aluminum profile products, mainly as follows:   1. Unreasonable formula and mixing process 1. Excessive fillers;   2. Type and quantity of impact modifiers added; 3. Too much or too little stabilizer;   4, excessive amount of external lubricant;   5, hot mixing and feeding sequence, temperature setting and curing time also have decisive factors on the performance of the profile. 2. Unreasonable extrusion process 1. Excessive or insufficient plasticization of the material;   2, insufficient head pressure;   3, low molecular components in the product are not discharged;   4, screw torque is too low;   5, traction speed and extrusion speed Mismatch.  3. The mold design is unreasonable.  1. The die section design is unreasonable, especially the distribution of internal ribs and the treatment of the angle of the interface. This will cause the existence of stress concentration, and it is necessary to improve the design and eliminate the right angles and acute angles at the interface.  2. Insufficient die pressure. The pressure at the die is directly determined by the compression ratio of the die, especially the length of the straight section of the die. If the compression ratio of the die is too small or the straight section is too short, the product will not be dense and the physical properties will be affected. Changing the pressure of the die head can adjust the flow resistance by changing the length of the straight section of the die; The compression ratio of the extruder screw is compatible; the melt pressure can also be changed by changing the formula, adjusting the extrusion process parameters, and adding a porous plate.  3. For the performance degradation caused by poor confluence of the diversion ribs, the length of the ribs and the outer surface, the confluence of the ribs and the ribs should be appropriately increased, or the compression ratio should be increased.  4. The die output is not uniform, resulting in inconsistent profile wall thickness or inconsistent density. This also caused the difference in the mechanical properties between the two sides of the profile. In our experiments, we sometimes cold-punched one side as qualified and the other side failed, which just proved this point. As for the thin wall and other non-standard profiles, I won't say more here.   5. The cooling rate of the shaping mold. The cooling water temperature often does not attract enough attention. The role of the cooling water is to cool and shape the stretched macromolecular chains in time to achieve the purpose of use.
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