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注塑模为什么要设置排气系统?

来源:http://www.ok9868.com     发布时间:2020-09-27 15:24:59    点击:

  注塑模的排气是模具设计中的一个重要问题,特别是在快速注塑成型中,对注塑模的排气要求更加严格。
  The exhaust of injection mold is an important problem in mold design, especially in rapid injection molding, the exhaust requirement of injection mold is more strict.
  1.注塑模中气体的来源。
  1. Source of gas in injection mold.
  1)浇注系统和模具型腔中存有的空气。
  1) Air in the gating system and mold cavity.
  2)有些原料含有未被干燥排除的水分,它们在高温下气化成水蒸气。
  2) Some raw materials contain water that has not been removed by drying, and they are vaporized into steam at high temperature.
  3)由于注塑时温度过高,某些性质不稳定的塑料发生分解所产生的气体。
  3) Due to the high temperature during injection molding, some unstable plastics decompose and produce gas.
  4)塑料原料中的某些添加剂挥发或相互化学反应生成的气体。
  4) The gas produced by volatilization or chemical reaction of some additives in plastic raw materials.
  2.排气不良的危害
  2. Hazards of poor exhaust
  注塑模的排气不良,将会给塑件的质量等诸多方面带来一系列的危害。主要表现如下:
  Poor exhaust of injection mold will bring a series of hazards to the quality of plastic parts and many other aspects. The main manifestations are as follows:
                                                  山东模具  
  1)在注塑过程中,熔体将取代型腔中的气体,如果气体排出不及时,将会造成熔体充填困难,造成注射量不足而不能充满型腔。
  1) In the process of injection molding, the melt will replace the gas in the cavity. If the gas is not discharged in time, it will make the melt filling difficult, resulting in insufficient injection volume and unable to fill the cavity.
  2)排除不畅的气体会在型腔内形成高压,并在一定的压缩程度下渗入塑料内部,造成气孔、空洞,组织疏松、银纹等质量缺陷。
  2) High pressure will be formed in the mold cavity when the gas is not smooth, which will penetrate into the plastic under a certain degree of compression, resulting in porosity, cavity, loose tissue, craze and other quality defects.
  3)由于气体被高度压缩,使得型腔内温度急剧上升,进而引起周围熔体分解、烧灼,使塑件出现局部碳化和烧焦现象。它主要出现在两股熔体的合流处,*角及浇口凸缘处。
  3) Due to the high compression of the gas, the temperature in the mold cavity rises sharply, which causes the decomposition and burning of the surrounding melt, resulting in local carbonization and scorching of the plastic parts. It mainly occurs at the confluence of two melts, * angle and gate flange.
  4)气体的排除不畅,使得进入各型腔的熔体速度不同,因此易形成流动痕和熔合痕,并使塑件的力学性能降低。
  4) Due to the poor gas removal, the melt velocity entering each cavity is different, so flow marks and fusion marks are easy to form, and the mechanical properties of plastic parts are reduced.
  5)由于型腔中气体的阻碍,会降低充模速度,影响成型周期,降低生产效率。
  5) Due to the obstruction of gas in the cavity, the filling speed will be reduced, the molding cycle will be affected and the production efficiency will be reduced.
  3.塑件中气泡的分布
  3. Distribution of bubbles in plastic parts
  型腔中气体的来源主要分三类,型腔中积存的空气;原料中分解产生的气体;原料中残留水蒸发的水蒸气,由于来源的不同所产生气泡的位置也不同。
  There are three main sources of gas in the mold cavity: the air accumulated in the cavity; the gas produced by decomposition in the raw material; and the residual water vapor in the raw material. Due to different sources, the positions of bubbles are different.
  1)模腔中积存空气所产生的气泡,常分布在与浇口相对的部位上。
  1) The air bubbles generated by air accumulation in the mold cavity are usually distributed in the position opposite to the gate.
  2)塑料原料中所分解或化学反应产生的气泡则沿塑件的厚度分布。
  2) The bubbles produced by decomposition or chemical reaction in plastic raw materials are distributed along the thickness of plastic parts.
  3)塑料原料中残存水气化产生的气泡,则不规则地分布在整个塑件上
  3) The bubbles produced by the residual water gasification in the plastic raw materials are irregularly distributed on the whole plastic part
  从上述塑件中气泡的分布状况看,不仅可以判断气泡的性质,而且可判断模具的排气部位是否正确可靠。
  From the distribution of bubbles in the plastic parts mentioned above, not only the properties of bubbles can be judged, but also whether the exhaust part of the mould is correct and reliable.
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