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山东模具浇口有哪几种形式?

来源:湖北快3走势图http://www.ok9868.com     发布时间:2019-05-29 18:23:41    点击:

  山东模具浇口有哪几种形式?浇口,又称进料口,是分流器与模腔之间的一段薄而短的流量(除直接浇口外),是浇注系统的关键部件。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)空腔填满后,在浇口处熔融一次冷凝,防止其回流。
  (1) After filling the cavity, the first condensation is melted at the gate to prevent its reflux.
  (2)容易在浇口系统中切割冷凝水。闸门截面积约为分流截面积的0.03 ~ 0.09。浇口长度约0.5 mm ~ 2mm,浇口的具体尺寸一般根据经验确定。取下下限,在试模时逐步修正。
  (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.
  当塑料熔体通过浇口时,剪切速率增大,熔体内摩擦加剧,增加了物料流动温度,降低了粘度,改善了流动性能,有利于充型。但浇口尺寸过小会增加压力损失,凝结水速度加快,进给困难,甚至形成喷射现象,影响塑料零件的质量。
  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.
  浇口形式如下:
  The gate forms are as follows:
  (1)浇口
  (1) gate
  直浇口,又称中心浇口,这种浇口流动阻力小,进给速度快,在单腔模具中常用来形成大而深的塑料零件。适用于各种塑料,特别是高粘度、低流动性的塑料,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.
  直门成型浅平当塑料部件会产生弯曲和扭曲现象,同时删除门不便,有明显的痕迹,有时因为门位置的热量集中,腔密封,内部压力和成为裂纹源,所以设计,门应尽可能小。在成形薄壁塑料件时,浇口根部直径比较多为塑料件厚度的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.
                        山东模具
  (2)侧门
  (2) side door
  侧浇口,又称边浇口,其断面为矩形,一般开在分型面上,由塑料部分的侧浇口进料,可合理选择浇口位置,特别适用于多个型腔。如图10-12所示,一般宽度B= 1.5mm ~ 5mm,厚度h= 0.5mm ~ 2mm(或塑料件壁厚的1/3 ~ 2/3),长度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)门
  (3) door
  点浇口,也称为销浇口,是一个小尺寸浇口,如图10-14所示。塑料熔体具有很高的剪切速率。广泛应用于各种壳体成型零件。当模具打开时,浇口可以自己打开。
  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.
  门和塑料部件连接,为了防止点门口拉破损坏塑料部件,可以设计有一个小凸点浇口截面积很小,老板形式凝结快,不利于喂食,墙上的厚塑料部件不应使用。
  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)潜在的门
  (4) Potential doors
  它又称剪切门,是由用于三板模的点浇口演变而来,而潜浇口用于两板模,从而简化了模具结构。所述潜伏门设置在所述塑件的内外,不影响所述塑件的外观。在释放塑料部件时,浇口被切断,但需要有较强的推力,不宜使用较强和较硬的塑料。
  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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