What causes the brittleness of aluminum profiles?

by:Zeyi     2021-09-07
The brittleness of aluminum profiles is a factor that plagues the normal operation of some aluminum profile manufacturers. The brittleness of aluminum profiles more or less affects the market share and user reputation of these aluminum profile companies in terms of cross-sectional appearance and the degree of recognition of door and window assembly plants. . The main characteristics of aluminum profile brittleness are: cracking and cold punching rupture during blanking. So, what causes the brittleness of aluminum profiles?  1. The formula and mixing process are unreasonable.   1. Too much filler.  2. Type and quantity of impact modifier added.   3. Too much or too little stabilizer.   4. Excessive amount of external lubricant.  5. The order of hot mixing and feeding, temperature setting and curing time are also decisive factors for the performance of the profile.   Two, the extrusion process is unreasonable     1. The material is over or under plasticized.  2. The head pressure is insufficient.   3. The low-molecular components in the product are not discharged.   4. The screw torque is too low.   5. The traction speed does not match the extrusion speed.  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 straight.   is determined by the compression ratio of the mold, especially the length of the straight section of the mold. 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. The change of die pressure can adjust the flow resistance by changing the length of the straight section of the die on the one hand; on the other hand, different compression ratios can be selected to change the extrusion pressure in the die design stage, but it must be noted that the compression ratio of the die The compression ratio of the extruder screw is compatible; you can also change the melt pressure 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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