江苏快3

平达塑料防腐管材

ZHUANYEFRPPGUAN,PPGUAN,PPHGUAN,PVDFGUAN,PEGUANSHENGCHANQIYE

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PPH管材的塑性

PPH管材的塑性

PPH管材的塑性加工是以管材作毛坯,通过各种塑性加工手段.制造管材零件的加工技术。实际上,PPH管材的塑性加工是指对管材的二次加工,故属于管材深加工技术的范畴。

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  1. 璧厚变薄、破裂
    江苏快3如弯曲变形区外侧壁及胀形变形区管壁,扩口及翻边变形区的管壁,均会产生壁厚变薄。变薄量蕞大的部位在蕞大变形处,变薄过度时导致破裂。从变形力学的角度看,这是由于拉伸应力的作用而使变形区丧失厂承载能力,因此属塑性拉伸失稳间题。该类质量缺陷均发生在伸长类成形工序中。

  2. 壁厚增厚、起皱
    江苏快3如弯曲变形区内侧壁及缩口(径)变形区管壁,壁厚均有增加。若变形程度过大,则管壁丧失稳定,引起皱折。因此,失稳不只是在拉应力作用下才会出现,在压应力作用下,同样存在塑性失稳问题。此类质量缺陷均发生在压缩类成形工序中。

  3. 横断而形状畸变
    在管材的弯曲加工中,若不采取必要的措施(如在管内填充料或放置芯棒支撑等),弯曲后的横断面或大或小地都将发生畸变(近似为椭圆形)。又如利用模具对管材切断时,由于切刀对管壁的压力作用,也会使切断面产生压塌现象,变为非圆形。因此。为防止上述质量缺陷的产生,选用合理的工艺方法及采取必要的工艺措施,是十分重要的。生产实践表明,消除或蕞大限度地减少质量缺陷,以满足管件的使用要求,是管材塑性加工的工艺关键。

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