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網站首頁 > 産品中心 > 凯时K66登录 > 一出三針閥式熱流道

一出三針閥式熱流道

  • 所属分类 : 凯时K66登录

  • 更新时间 : 2018-09-27
  • 産品編號: YX640472412
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産品介紹

熱流道産品介紹

1.通過控制澆口開啓時間,保證型腔填充順暢及熔體流動平衡,消除熔接痕。 
大型注塑件的注塑制造通常需要兩個或多個熱澆口才能注滿。對于普通的熱澆注系統,在注射開始時澆口便隨之同時開啓。這樣的進膠方式不可避免地存在熔合缺陷,即在兩股熔料前鋒彙合時,由于兩股熔體不能完全熔爲一體,而形成熔合印迹,反應在制品表面上就是通常所說的熔接痕。雖然可以通過提高熔料溫度、增大保壓壓力和調整注塑工藝參數等方法進行改善,但實際改善效果有限。 
采用针阀式熱流道技术来构建浇注系统,即可实现程序控制各阀浇口的开启和关闭,又可控制在第一股熔体刚刚流过第二个阀浇口时,阀针开启,打开第二个浇口,此时可根据需要开启或者关闭第一个浇口,一直进行下去直到所有浇口都被打开和型腔被充满,使熔体完全熔合,得到无熔接痕制品。
 
2.利用該技術獲得的制件産品不會有殘留澆口痕迹,因此,可適用加工表面質量要求較高的注塑件。 
有些时候使用阀浇口的原因是因为阀浇口在制件上的痕迹平滑,只相当于一个顶出销所遗留的痕迹,所以它与潜伏式浇口和其他类型熱流道端部痕迹相比要小得多。 
 
3.更有效的控制保壓和成形周期。 
针阀式熱流道能够使用较大直径的浇口,可使熔体在模腔中的流动加快,从而缩短制件成形周期,并能更好的保压。 
 
4.有效減少制品的內應力,提高制件穩定性。 
    如前所述,传统热浇注系统中两股熔体流动前锋汇合后会形成熔接痕,其结果不单只影响制品外观,同时也容易在制件内部产生较大的残余内应力。这种应力集中现象将会降低制品的强度。如果采用阀浇口控制技术控制熔体的进胶顺序,可以有效避免熔体流动前锋的直接交汇,从而避免了应力集中现象的产生,进而提高了制件的稳定性。 
    此外,使用针阀式热嘴还可防止在开模时物料反吸及牵丝(拉丝)现象的出现。 
针阀式凯时K66登录结构及原理 
    针阀式熱流道的阀针运动可通过弹簧控制,也可使用气压或液压等控制,其结构形式多种多样。 对于汽车保险杠这样的大型注塑件,凯时K66登录通常采用时序针阀熱流道。其稳定性较好,浇口的开启和关闭时间控制也比较可靠。


Hot runner product introduction
1 by controlling the opening time of the gate, ensure the cavity filled with smooth and melt flow balance, eliminate weld marks.
Injection molding manufacturing large injection parts usually require two or more hot runner to fill. For ordinary hot runner system, the gate will be opened at the same time as the injection begins. This glue is inevitable in the presence of fusion defects, namely in two strands of molten material striker confluence, due to the two strands of melt cannot completely fused as one, and the formation of fusion imprinting reaction WIP surface is commonly referred to as the melting marks. Although it can be improved by increasing the temperature of molten material, increasing the pressure of the pressure and adjusting the parameters of injection molding process, the effect is limited.
Using needle valve type hot runner technology to construct the gating system, you can realize the program control of the valve gate is opened and closed, and can be controlled in the first unit melt just through a second valve gate, opening a needle valve, open the second gate. At the same time, can according to need to open or close the first gate, always go on until all gates are opened and the cavity is full, the melt completely fused, no weld marks of products.
2 use the technology to obtain the products will not have residual gate traces, therefore, can be applied to the processing surface quality requirements of higher injection molding parts.
There are times when the valve gate is due to the valve gate on the part of the smooth, only equivalent to a top of the traces left by the pin, so it is much smaller than the potential type of runner and other types of hot runner ends.
3 more effective control of the holding pressure and forming cycle.
Needle valve type hot runner can use larger diameter of the gate, the melt in the mold cavity flow accelerated, so as to shorten the stamping forming cycle, and can better packing.
4 to reduce the internal stress and improve the stability of the products.
As mentioned earlier, the traditional hot runner system in two strands of melt flow front after confluence will weld line is formed, the result is not only affecting the product appearance, but also easy to produce a large residual stress in parts of internal. This stress concentration phenomenon will reduce the intensity of the product. If the valve gate control technology to control the melt into the order, it can effectively avoid the direct intersection of the melt flow front, thereby avoiding the stress concentration phenomenon, and thus improve the stability of the product.
In addition, the use of valve type hot nozzle can be prevented in the mold material suction and wire drawing (drawing) phenomenon.
Needle valve type hot runner system structure and principle
Needle valve type hot runner valve needle motion can be controlled by a spring and the use of pneumatic or hydraulic control, the structure of a variety of forms and diverse. For large injection molding of automobile bumper case, we usually use hot runner valve timing. Its stability is good, the opening and closing time of the gate is also relatively reliable.


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