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山東精密模具注塑成型工藝

刮刮乐2000 www.yfrmbf.com.cn 來源:    發布時間:2019-06-10 17:20:52    點擊:

  山東精密模具注塑成型工藝
  Injection Molding Technology of Precision Mold in Shandong Province
  塑料注射成型的工藝包括成型前的準備、注射工藝和產品的后處理。
  Plastic injection moulding process includes preparation before moulding, injection process and product post-treatment.
  1. 塑料注射成型前的準備
  1. Preparing for Plastic Injection Molding
  為了保證注塑成型的順利進行和塑料件的質量,工廠應做好以下注塑準備:
  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)原材料的檢驗和預處理。應檢查材料的外觀和工藝性能,并在成型前染色和干燥。原材料的檢驗包括顏色、粒度和均勻性、流動性、熱穩定性、收縮和含水量的測定。為了使注塑件的加工更加美觀,或者滿足使用要求(光學設備零件需要用黑色來防止光泄漏),塑料原料通常都是染色的。熱塑性塑料含有或多或少的水和揮發性物質,適量的水和揮發性物質可以起到塑化作用。但是當水分和揮發物的含量超過一定的量時,就會在塑料件上造成缺陷,產生嚴重的氣泡,影響塑料件的質量和精度,所以此時就會進行干燥處理。干燥過程是利用高溫來降低塑料的含水量,該方法有烘箱干燥、紅外干燥、熱板干燥、高頻干燥、熱塑性塑料通常采用的前兩種干燥方法。
  (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.
                         山東模具
  (2)墊片預熱。金屬鑲件與塑料的收縮率相差較大,所以當塑料零件冷卻時,鑲件周圍會產生較大的內應力,導致鑲件周圍塑料層的強度降低,產生裂紋。因此,在成型前對金屬嵌套進行預熱,以減小嵌套與塑料之間的溫差。
  (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.
  成型時不易產生應力開裂塑料,且嵌套小,不能預熱。預熱溫度限制在金屬鑲件表面的鋅或鉻鍍層,通常為110 ~ 130℃。對于表面無涂層的鋁合金或銅鑲件,預熱溫度可達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)油缸清潔。在注射成型前,當注射筒中剩余的塑料與所使用的塑料顏色不同或相同時,將對其進行清洗。
  (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)脫模劑的選擇。在注射成型過程中,塑料脫模部分主要取決于合理的工藝條件和正確的模具設計,但是由于塑料部件本身的復雜性或穩定的工藝條件控制,它可能導致脫模困難,因此脫模劑常用于實際生產。由于注塑材料的種類、塑件的形態、結構、鑲嵌與否以及使用要求的不同,各種塑件成型前的準備工作也不盡相同。
  (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.
  以上講了山東精密模具注塑成型工藝,想要了解更多關于山東模具的信息,請關注我們網站更新。
  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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