1. As for the reduction of the function of the aluminum sheet due to the poor mobilization of shunting bars, the length of the bars and the outer appearance, the confluence of the bars and bars should be increased appropriately. Perhaps the shrinkage ratio should be increased to deal with it. The change of the die pressure can adjust the flow resistance by changing the length of the flat section of the die head.
In the stage of die planning, different shrinkage ratios can be chosen to change the extrusion pressure, but it is necessary to pay attention to that the head shrinkage ratio is compatible with the screw shrinkage ratio of the extruder, and the melt pressure can be changed by changing the formula, adjusting the extrusion process parameters and increasing the porous plate.
Secondly, the uneven discharge of the die, the inconsistent thickness of the wall and the inconsistent density of the profiles, may be inconsistent. This also constitutes the difference of the mechanical function between the two surfaces of the profiles. As for the non-standard profiles such as the wall thickness, there is no more to say here.
Thirdly, the section planning of die is unreasonable, especially the distribution of internal reinforcement and the treatment of interface viewpoint. This will constitute the appearance of stress convergence. It is necessary to improve the planning and eliminate the right and acute angles at the interface.
4. Cooling rate of profiling die. Cooling water temperature often does not lead to satisfactory attention. The function of cooling water is to cool the macromolecular chain stretched by profiles in time to reach the purpose of application.
Fifth, the die pressure is insufficient. The pressure at the die head is determined by the contraction ratio directly withstanding the die, especially the length of the straight section of the die. Too small the contraction ratio of the die or too short the straight section will constitute the product not compact, affecting the physical function.
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