铝镁锰板的发脆与哪些因素有关？

一、对于因分流筋汇合不良造成的性能降落应适当增长筋与外外观、筋与筋汇流处的长度,或者增大压缩比来解决,模头压力的改变可以通过改变模头平直段长度来调整流料阻力;在模具设计阶段可选择不同的压缩比来改变挤出压力,但必须细致机头压缩比要与挤出机螺杆的压缩比相适应;还可以通过改变配方,调整挤出工艺参数,增长多孔板来改变熔体压力的大小. First, for the performance decline caused by the poor convergence of the splitter, the length of the reinforcement and the outer surface, the bar and the rebar junction should be appropriately increased, or the compression ratio can be increased. The change of the die head pressure can be adjusted by changing the length of the die head to adjust the flow resistance; in the die design stage, different compression ratios can be selected to change the extrusion pressure. Force, but it must be noted that the compression ratio of the head of the machine should be adapted to the compression ratio of the extruder screw, and the extrusion process parameters can be adjusted by changing the formula, and the porous plate can be added to change the pressure of the melt.

二、口模出料不均匀,造成型材壁厚薄不同等,或者密实度不同等.这也就造成了型材两个面之间的力学性能上的差别,至于壁薄等非标型材这里就不再多说.

Two, the die material is not uniform, resulting in the uneven thickness of the profile wall, or the inconsistency of the density. This also causes the difference between the mechanical properties of the two surfaces of the profiles. As for the non standard sections, such as wall thin, there is no more to be said. 三、口模截面设计不合理,尤其是内筋的分布和交界面角度的处理.如许会造成应力集中征象存在,必要改进设计和消弭交界面处的直角和锐角. Three. The design of the section of the die is not reasonable, especially the distribution of the inner reinforcement and the treatment of the angle of the interface. This will cause the existence of the stress concentration phenomenon, and the right angle and the sharp angle at the interface should be improved. 四、定型模的冷却速率.冷却水温每每没有引起充足的正视,冷却水的作用是将型材拉伸的大分子链及时冷却定型,达到使用目的. Four. The cooling rate of the mold. The cooling water temperature is often not paid enough attention. The effect of cooling water is to cool and shape the large molecular chain stretching of the profile in time to achieve the purpose of use. 五、模头压力不足.模头处压力大小是直接受模具的压缩比,分外是模具平直段的长度来决定的.模头的压缩比太小或平直段太短都会造成成品不致密,影响物理性能.

Five, the pressure of the die head is not enough. The pressure of the die head is directly determined by the compression ratio of the die, especially the length of the flat section of the die. The compression ratio of the die head is too small or the straight section too short will cause the products not to be dense and affect the physical properties.

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