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注塑加工过程中正确排气的重要性

来源:http://www.sdlqmj.com 日期:2021-01-08 发布人:liqiang 浏览次数:
在注塑加工工业的迅速发展的当代,使人们对各种塑料制品的表面的质量要求和尺寸的精度要求越来越高,尤其是在不同的工程技术中作为纯粹的结构零件使用的塑料制品,为满足其使用的不同的物理性能和力学性能,主要的要求还是要制品组织致密、熔接牢固、强度高、内应力小。
With the rapid development of the injection molding industry, people have higher and higher requirements for the surface quality and dimensional accuracy of various plastic products, especially for the plastic products used as pure structural parts in different engineering technologies. In order to meet the different physical and mechanical properties, the main requirements are that the products should be compact in structure, solid in fusion, and flexible in size High strength and low internal stress.
但在注射模试模过程中,然后调整好注塑工艺的参数后,制品还常会出现填充不足、内应力高、表面流线等各种不同的现象,这主要原因是模具的排气有问题。在模具进行注塑加工的时候,模具内产生的各种气体主要有以下几个来源和出处: 有在型腔和浇注系统中存在的空气 ; 塑料原料中含有的水分在注射温度下蒸发而成的水蒸气;高温下塑料分解所产生的气体;
But in the process of injection mold testing, and then adjust the parameters of injection molding process, the products often appear various phenomena, such as insufficient filling, high internal stress and surface streamline, which is mainly due to the problem of the exhaust of the mold. In the process of injection molding, all kinds of gases produced in the mold mainly come from the following sources: air in the cavity and gating system; water vapor evaporated from the water contained in the plastic raw materials at the injection temperature; gas generated from the decomposition of plastic at high temperature; gas generated from the decomposition of plastic at high temperature;
在注塑的时候塑料中一些添加剂挥发掉后或者一些热固性塑料成形过程中交联反应所生成的气体。同时在要保证注射成形的过程中要完整的脱模进行,减少制品的成形缺陷,我们再考虑如何提高其质量的注射加工工艺的同时,还必须重视其模具排出多余气体的系统的设计。
In the injection molding, some additives in the plastic volatilize or some thermosetting plastic forming process cross-linking reaction generated by the gas. At the same time, in order to ensure the complete demoulding in the process of injection molding, reduce the forming defects of products, we must consider how to improve the quality of the injection processing technology, at the same time, we must also pay attention to the design of the mold exhaust excess gas system.
在注塑模具的过程中,如模具排气不良,型腔中的气体受到压缩将产生很大的背压,极大的阻碍了塑料熔体的正常快速充模,使注塑变得困难;同时会迫使注射时压力不断提高,保压时间增加,成形周期延长,生产注塑件的时候效率也不停降低。有时候腐蚀性的气体在型腔表面形成积垢,降低了模具正常使用下的寿命。
In the process of injection mold, if the mold exhaust is bad and the gas in the cavity is compressed, it will produce a great back pressure, which greatly hinders the normal and rapid filling of plastic melt and makes injection molding difficult; at the same time, it will force the pressure to increase continuously during injection, the holding time to increase, the forming cycle to extend, and the efficiency to produce injection parts will also continue to decrease. Sometimes corrosive gas forms scale on the surface of the mold cavity, which reduces the service life of the mold under normal use.
在注塑机塑料充模的过程中,为了将熔融的塑料的流动性保持在的状态,因此必须要提高在熔融塑料的温度和注射压力,但也因为这样制品的残余应力会随之压力而提高,产品四周的翘曲和塑料裂解的可能性也增加。比方模具的排气正常情况下,注射速度可提高,充填和保压可容易达到的状态,不需额外增加料筒和喷嘴的温度。这样制品的残余应力小,翘曲变形小。注塑加工时候我们也要考虑如何排气,好的排气系统会提交塑料件的质量。
In the process of plastic filling of injection molding machine, in order to keep the fluidity of the molten plastic in the best state, it is necessary to increase the temperature and injection pressure of the molten plastic, but also because the residual stress of the product will increase with the pressure, the possibility of warpage and plastic cracking around the product will also increase. For example, under the normal condition of mold exhaust, the injection speed can be increased, and the filling and pressure maintaining can easily reach the best state without additional temperature of barrel and nozzle. In this way, the residual stress of the product is small and the warpage deformation is small. During injection molding, we should also consider how to exhaust. A good exhaust system will submit the quality of plastic parts.

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