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山东模具制造厂家的浇口形式有哪些

来源:http://www.sdlqmj.com 日期:2020-05-21 发布人:liqiang 浏览次数:
  浇口,也称为进料口,是连接分流器和腔体熔体的通道。浇口的选择直接关系到注塑产品能否完整、高质量的注塑。浇口设计包括浇口截面形状、尺寸的确定和浇口位置的选择。在注塑模具的设计中,根据浇口的结构形式和特点,有以下11种常用浇口形式。
  The gate, also known as the feed gate, is the channel connecting the diverter and the cavity melt. Gate selection is directly related to the integrity and high quality of injection products. Gate design includes gate section shape, size determination and gate location selection. In the design of injection mold, according to the structure and characteristics of gate, there are 11 kinds of common gate forms as follows.
  1. 直门:即主门,属于非限制性门
  1. Straight door: the main door, which belongs to the non restrictive door
  (1)优点:塑料熔体从主通道的大端直接进入模腔,具有流动阻力小、加工时间短、回灌时间长等特点。这样的浇口具有良好的熔体流动状态,熔体从型腔底部到分型面中部,有利于排气;这种浇口限度地缩小了注塑制品和浇注系统在分型面上的投影面积,使模具结构紧凑,使注塑机受力均匀。
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  (1) Advantages: the plastic melt directly enters the mold cavity from the large end of the main channel, which has the characteristics of small flow resistance, short processing time and long reinjection time. Such gate has a good melt flow state, and the melt flows from the bottom of the cavity to the middle of the parting surface, which is conducive to exhaust; this gate reduces the projection area of the injection products and the gating system on the parting surface to the maximum extent, so that the mold structure is compact and the stress of the injection molding machine is even.
  (2)缺点:饲料具有较大的残余应力,容易导致注塑制品翘曲变形,门大同时,移除门马克是困难的和跟踪较大,影响美观,所以这种类型的门更长的用于大中型注塑工艺、深腔、圆柱形或外壳注塑产品,特别适合聚碳酸酯、聚砜类塑料粘度。另外,这种浇口只适用于单腔模具。
  (2) Disadvantages: the feed has a large residual stress, which is easy to cause warpage and deformation of the injection molding products. At the same time, it is difficult to remove the door mark, which has a great impact on the aesthetics. Therefore, this type of door is longer for large and medium-sized injection molding process, deep cavity, cylindrical or shell injection molding products, especially for the viscosity of polycarbonate and polysulfone plastics. In addition, this gate is only suitable for single cavity mold.
  在设计这种类型的门,以减少门的面积接触注射产品,防止收缩、变形等缺陷,一方面,应尽量选择小锥度的主要通道锥角(2 ~ 4°),另一方面,应该尽量减少固定模板的厚度和固定模具基地。
  In the design of this type of door, in order to reduce the area of the door to contact the injection products and prevent shrinkage, deformation and other defects, on the one hand, the main channel cone angle (2 ~ 4 °) with small taper should be selected as far as possible, on the other hand, the thickness of the fixed formwork and the fixed mold base should be reduced as far as possible.
  2. 侧门:国外称侧门为标准门。金属精密模具加工的侧浇口一般设置在分型面上,塑料熔体从内到外填充模具型腔,其截面形状多为矩形(平槽)。改变浇口的宽度和厚度可以调节熔体的剪切速率和浇口的冻结时间。这种浇口可根据注塑制品的形状特点选择浇口位置,加工、修整方便,应用广泛。
  2. Side door: it is called standard door in foreign countries. The side gate of metal precision die is generally set on the parting surface, and the plastic melt fills the die cavity from the inside to the outside, and its section shape is mostly rectangular (flat groove). The shear rate of melt and the freezing time of gate can be adjusted by changing the width and thickness of gate. The gate location can be selected according to the shape characteristics of the injection molding products. It is easy to process and trim, and widely used.
  (1)优点:浇口截面小,可减少浇注系统中熔融材料的消耗,容易移开浇口,痕迹不明显。适用于各种形状的注塑制品,但不适用于长、细筒注塑制品。
  (1) Advantages: the gate section is small, which can reduce the consumption of molten materials in the gating system, and it is easy to remove the gate without obvious trace. It is suitable for injection products of various shapes, but not for long and thin cylinder injection products.
  (2)缺点:注塑产品与浇口不能单独分开,存在焊接痕迹,注塑压力损失大,给排气腔深的注塑产品。
  (2) Disadvantages: injection products and gate can not be separated separately, there are welding traces, injection pressure loss, injection products with deep exhaust cavity.
  3.扇形浇口:扇形浇口一般设置在分型面上,从型腔外侧进料。浇口沿加料方向逐渐加宽,厚度逐渐减小。塑料熔体从浇口进入型腔的波前相对较直,可以减少翘曲变形。它非常适合于形成板状塑料制品的大宽度。
  3. Fan gate: the fan gate is generally set on the parting surface and feeds from the outside of the cavity. The gate widens gradually along the direction of feeding, and the thickness decreases gradually. The wave front of the plastic melt entering the mold cavity from the gate is relatively straight, which can reduce the warpage. It is very suitable for forming large width of plate-shaped plastic products.
  4. 晶圆栅:又称平栅。浇口的分配流道与型腔的侧面平行,通常比塑料的宽度长。
  4. Wafer gate: also known as flat gate. The distribution channel of the gate is parallel to the side of the cavity, usually longer than the width of the plastic.
  (1)优点:塑料熔体通过薄壁浇口低速均匀进入型腔,料流平行,避免翘曲变形。它常用于形成大面积的平薄壁塑料制品。
  (1) Advantages: the plastic melt enters the mold cavity evenly through the thin-walled gate at low speed, the material flow is parallel, and the warpage deformation is avoided. It is often used to form a large area of flat and thin-walled plastic products.
  (2)劣势:移门困难,增加了塑料产品的生产成本。
  (2) Disadvantages: it is difficult to move the door, which increases the production cost of plastic products.
  5. 耳门:耳门主要用于高透明平板塑料制品和对塑料制品变形要求小的制品。
  5. Ear door: ear door is mainly used for high transparent flat plastic products and products with small deformation requirements for plastic products.
  (1)优点:护耳栅是打开模具型腔侧面的耳槽。熔体通过浇口冲击在耳槽侧面产生摩擦热,从而提高流动度。调整方向和速度后,耳罩均匀、平稳地进入模腔,避免了射流。
  (1) Advantage: the ear guard is to open the ear groove on the side of the mold cavity. The melt generates friction heat on the side of the ear groove through the gate impact, so as to improve the fluidity. After adjusting the direction and speed, the earmuff enters the cavity evenly and smoothly, avoiding the jet.
  (2)缺点:闸门切割难度大,闸门印痕大。
  (2) Disadvantages: it is difficult to cut the gate, and the gate marks are large.
  以上是山东模具制造厂家小编为大家介绍的相关内容,想要了解更多内容,欢迎访问网站:http://www.sdlqmj.com
  The above is the relevant content introduced by Shandong mold manufacturer. If you want to know more, please visit the website: http://www.sdlqmj.com

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