[China Aluminum Network] 1, lack of pressure on the die. 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. The compression ratio of the die is too small or the straight section is too short can cause the product not to be dense and affect the physical properties.

2. Inhomogeneous discharge of the die, resulting in inconsistent thickness of the profile wall, or inconsistent density. This results in a difference in the mechanical properties between the two sides of the profile. As for non-standard profiles such as thin walls, there is no longer any more to say.

3. The cross section design of the die is irrational, especially the distribution of the inner ribs and the treatment of the interface angle. This will cause stress concentration, and it is necessary to improve the design and eliminate the right angles and acute angles at the interface.

4, the cooling rate of the fixed mold. The cooling water temperature often does not cause enough attention. The role of cooling water is to cool and shape the macromolecules that are stretched in profile to achieve the purpose of use.

5, for the performance caused by the poor convergence of diverging ribs should be properly increase the length of the ribs and the outer surface, ribs and ribs confluence, or increase the compression ratio to solve.

Die pressure can be changed by changing the length of die straight section to adjust the flow resistance; in the mold design stage can choose different compression ratio to change the extrusion pressure, but must pay attention to the head compression ratio with the extruder screw Compression ratio is suitable; can also change the formulation, adjust the extrusion process parameters, increase the porous plate to change the size of the melt pressure.

Complex Precision Machining Components

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