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山東模具澆口有哪幾種形式?

刮刮乐2000 www.yfrmbf.com.cn 來源:    發布時間:2019-05-29 18:23:41    點擊:

  山東模具澆口有哪幾種形式?澆口,又稱進料口,是分流器與模腔之間的一段薄而短的流量(除直接澆口外),是澆注系統的關鍵部件。其主要功能是:
  How many kinds of moulds and gates are there in Shandong? Gate, also known as feed gate, is a thin and short flow between the distributor and the die cavity (except for the direct gate), which is the key component of the gating system. Its main functions are:
  (1)空腔填滿后,在澆口處熔融一次冷凝,防止其回流。
  (1) After filling the cavity, the first condensation is melted at the gate to prevent its reflux.
  (2)容易在澆口系統中切割冷凝水。閘門截面積約為分流截面積的0.03 ~ 0.09。澆口長度約0.5 mm ~ 2mm,澆口的具體尺寸一般根據經驗確定。取下下限,在試模時逐步修正。
  (2) It is easy to cut condensate in gate system. The section area of the gate is about 0.03-0.09 of that of the diversion section. The gate length is about 0.5 mm ~ 2 mm. The specific size of the gate is generally determined by experience. Take the lower limit and correct it step by step during the test.
  當塑料熔體通過澆口時,剪切速率增大,熔體內摩擦加劇,增加了物料流動溫度,降低了粘度,改善了流動性能,有利于充型。但澆口尺寸過小會增加壓力損失,凝結水速度加快,進給困難,甚至形成噴射現象,影響塑料零件的質量。
  When the plastic melt passes through the gate, the shear rate increases, the friction in the melt increases, the material flow temperature increases, the viscosity decreases, the flowability improves, and the filling is beneficial. However, too small gate size will increase pressure loss, accelerate the speed of condensation water, make it difficult to feed, and even form spray phenomenon, which will affect the quality of plastic parts.
  澆口形式如下:
  The gate forms are as follows:
  (1)澆口
  (1) gate
  直澆口,又稱中心澆口,這種澆口流動阻力小,進給速度快,在單腔模具中常用來形成大而深的塑料零件。適用于各種塑料,特別是高粘度、低流動性的塑料,如PC、PSF等。
  Direct gate, also known as center gate, has small flow resistance and fast feeding speed. It is often used to form large and deep plastic parts in single cavity dies. It is suitable for all kinds of plastics, especially those with high viscosity and low fluidity, such as PC, PSF, etc.
  直門成型淺平當塑料部件會產生彎曲和扭曲現象,同時刪除門不便,有明顯的痕跡,有時因為門位置的熱量集中,腔密封,內部壓力和成為裂紋源,所以設計,門應盡可能小。在成形薄壁塑料件時,澆口根部直徑比較多為塑料件厚度的2倍。
  Straight door shallow shallow shaping when plastic parts will produce bending and distortion phenomenon, while removing inconvenience door, there are obvious traces, sometimes because of the heat concentration of the door location, cavity seal, internal pressure and become the source of cracks, so the design of the door should be as small as possible. When forming thin-walled plastic parts, the diameter of gate root is at most twice the thickness of plastic parts.
                        山東模具
  (2)側門
  (2) side door
  側澆口,又稱邊澆口,其斷面為矩形,一般開在分型面上,由塑料部分的側澆口進料,可合理選擇澆口位置,特別適用于多個型腔。如圖10-12所示,一般寬度B= 1.5mm ~ 5mm,厚度h= 0.5mm ~ 2mm(或塑料件壁厚的1/3 ~ 2/3),長度L= 0.7mm ~ 2mm。
  Side gate, also known as side gate, its cross-section is rectangular, generally separated on the parting surface, feeding by the side gate of the plastic part, can reasonably select the gate location, especially suitable for multiple cavities. As shown in Figure 10-12, the general width B = 1.5mm-5mm, thickness h = 0.5mm-2mm (or 1/3-2/3 of the wall thickness of plastic parts), length L = 0.7mm-2mm.
  (3)門
  (3) door
  點澆口,也稱為銷澆口,是一個小尺寸澆口,如圖10-14所示。塑料熔體具有很高的剪切速率。廣泛應用于各種殼體成型零件。當模具打開時,澆口可以自己打開。
  Point gate, also known as pin gate, is a small size gate, as shown in Figure 10-14. Plastic melt has a high shear rate. It is widely used in various shell forming parts. When the die is opened, the gate can be opened by itself.
  門和塑料部件連接,為了防止點門口拉破損壞塑料部件,可以設計有一個小凸點澆口截面積很小,老板形式凝結快,不利于喂食,墻上的厚塑料部件不應使用。
  The door is connected with plastic parts. In order to prevent the breakage and damage of plastic parts at the point gate, a small bump gate can be designed with a small cross-sectional area. The boss's form condensates quickly, which is not conducive to feeding. Thick plastic parts on the wall should not be used.
  (4)潛在的門
  (4) Potential doors
  它又稱剪切門,是由用于三板模的點澆口演變而來,而潛澆口用于兩板模,從而簡化了模具結構。所述潛伏門設置在所述塑件的內外,不影響所述塑件的外觀。在釋放塑料部件時,澆口被切斷,但需要有較強的推力,不宜使用較強和較硬的塑料。
  It is also called shear gate, which evolved from the point gate used for three-plate die, while the submerged gate is used for two-plate die, thus simplifying the die structure. The latent door is arranged inside and outside the plastic part without affecting the appearance of the plastic part. When releasing plastic parts, the gate is cut off, but strong thrust is needed. It is not suitable to use stronger and harder plastics.
 
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