The main reason for the brittleness of aluminum profiles

by:Zeyi     2021-07-12
The main feature of aluminum.com/products.html' target='_blank'>aluminum profile brittleness is that it collapses during blanking and is easy to break during cold punching. This is reflected in physical and mechanical properties. Aluminum profile brittleness is a major factor that troubles the normal operation of aluminum profile manufacturers. Brittleness will have a certain effect no matter from the cross-section appearance and the degree of recognition of aluminum alloy door and window manufacturers, and affect the market share and user reputation of these aluminum profile manufacturers.  There are many reasons for the physical and mechanical properties of aluminum profile products. The main manifestations are:   1, the mold design of the aluminum profile is unreasonable  1, the design of the die section is unreasonable, especially the distribution of internal ribs and the treatment of the interface angle. 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 on the one hand; on the other hand, different compression ratios can be selected to change the extrusion pressure during 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; 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 length of the ribs and the confluence of 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.  2. The formula and mixing process are unreasonable  1. Too much filler.   2. The type and quantity of impact modifier added are unreasonable.   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.   Three, 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. Screw torque is too low.   5. The traction speed does not match the extrusion speed.    
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