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山东精密模具注塑成型工艺

来源:    发布时间:2019-06-10 17:20:52    点击:

  山东精密模具注塑成型工艺
  Injection Molding Technology of Precision Mold in Shandong Province
  塑料注射成型的工艺包括成型前的准备、注射工艺和产品的后处理。
  Plastic injection moulding process includes preparation before moulding, injection process and product post-treatment.
  1. 塑料注射成型前的准备
  1. Preparing for Plastic Injection Molding
  为了保证注塑成型的顺利进行和塑料件的质量,工厂应做好以下注塑准备:
  In order to ensure the smooth progress of injection moulding and the quality of plastic parts, the factory should prepare for the following injection moulding:
  (1)原材料的检验和预处理。应检查材料的外观和工艺性能,并在成型前染色和干燥。原材料的检验包括颜色、粒度和均匀性、流动性、热稳定性、收缩和含水量的测定。为了使注塑件的加工更加美观,或者满足使用要求(光学设备零件需要用黑色来防止光泄漏),塑料原料通常都是染色的。热塑性塑料含有或多或少的水和挥发性物质,适量的水和挥发性物质可以起到塑化作用。但是当水分和挥发物的含量超过一定的量时,就会在塑料件上造成缺陷,产生严重的气泡,影响塑料件的质量和精度,所以此时就会进行干燥处理。干燥过程是利用高温来降低塑料的含水量,该方法有烘箱干燥、红外干燥、热板干燥、高频干燥、热塑性塑料通常采用的前两种干燥方法。
  (1) Inspection and pretreatment of raw materials. The appearance and technological properties of the material should be checked and dyed and dried before forming. The testing of raw materials includes the determination of color, particle size and uniformity, fluidity, thermal stability, shrinkage and moisture content. In order to make the processing of injection parts more beautiful, or to meet the requirements of use (optical equipment parts need black to prevent light leakage), plastic raw materials are usually dyed. Thermoplastics contain more or less water and volatile substances, and a proper amount of water and volatile substances can play a plasticizing role. But when the content of moisture and volatile matter exceeds a certain amount, it will cause defects on plastic parts, produce serious bubbles, affect the quality and accuracy of plastic parts, so drying treatment will be carried out at this time. The drying process is to use high temperature to reduce the moisture content of plastics. This method includes oven drying, infrared drying, hot plate drying, high frequency drying and the first two drying methods commonly used in thermoplastics.
                         山东模具
  (2)垫片预热。金属镶件与塑料的收缩率相差较大,所以当塑料零件冷却时,镶件周围会产生较大的内应力,导致镶件周围塑料层的强度降低,产生裂纹。因此,在成型前对金属嵌套进行预热,以减小嵌套与塑料之间的温差。
  (2) Gasket preheating. The shrinkage ratio of metal inserts is quite different from that of plastics, so when the plastic parts are cooled, there will be greater internal stress around the inserts, which will lead to the decrease of the strength of the plastic layer around the inserts and cracks. Therefore, the metal nesting is preheated before forming to reduce the temperature difference between the nesting and the plastic.
  成型时不易产生应力开裂塑料,且嵌套小,不能预热。预热温度限制在金属镶件表面的锌或铬镀层,通常为110 ~ 130℃。对于表面无涂层的铝合金或铜镶件,预热温度可达150℃。
  It is not easy to produce stress cracking plastics when forming, and the nesting is small, so it can not be preheated. The preheating temperature is limited to zinc or chromium plating on the surface of metal inserts, usually 110 - 130 C. For aluminium alloy or copper inserts without coating, the preheating temperature can reach 150 C.
  (3)油缸清洁。在注射成型前,当注射筒中剩余的塑料与所使用的塑料颜色不同或相同时,将对其进行清洗。
  (3) Cylinder cleaning. Before injection moulding, when the remaining plastic in the injection tube is different or the same color as the plastic used, it will be cleaned.
  (4)脱模剂的选择。在注射成型过程中,塑料脱模部分主要取决于合理的工艺条件和正确的模具设计,但是由于塑料部件本身的复杂性或稳定的工艺条件控制,它可能导致脱模困难,因此脱模剂常用于实际生产。由于注塑材料的种类、塑件的形态、结构、镶嵌与否以及使用要求的不同,各种塑件成型前的准备工作也不尽相同。
  (4) Selection of release agent. In the process of injection moulding, the part of plastic demoulding mainly depends on reasonable process conditions and correct die design. However, due to the complexity of plastic parts or the control of stable process conditions, it may lead to demoulding difficulties, so demoulding agents are often used in actual production. Due to the different types of injection materials, the shape, structure, mosaic and usage requirements of the plastic parts, the preparation work before the forming of various plastic parts is also different.
  以上讲了山东精密模具注塑成型工艺,想要了解更多关于山东模具的信息,请关注我们网站更新。
  The injection moulding process of Shandong Precision Mould is described above. For more information about Shandong Mould, please pay attention to the update of our website.
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