Jinan injection molding manufacturer explained to you the cause analysis of too many burrs of injection molding products. Most burrs occur on the parting surface, that is, between the moving die and the static die, the sliding part of the slider, the gap of the insert, the hole of the ejector, etc. the melt flows into the molten material, and redundant flash is formed on the parts.

这样的毛刺将在成型过程中起到杠杆作用，并将进一步增加毛刺，这将导致模具局部凹陷，并且毛刺将在注射成型过程中进入增加的恶性循环。因此，如果在开始时发现毛刺，必须尽快修整模具。

Such burr will act as a lever in the molding process and further increase the burr, which will lead to local depression of the die, and the burr will enter an increasing vicious circle in the injection molding process. Therefore, if burrs are found at the beginning, the die must be trimmed as soon as possible.

出现故障的原因有几个：

There are several reasons for the failure:

1.锁模力不足以进行注塑成型

1. The clamping force is insufficient for injection molding

与成型零件的投影面积相比，如果夹紧力较小，则由于注射压力的缘故，动模和静模之间会存在间隙，这不可避免地会产生毛刺。特别是当将侧浇口放置在靠近零件中心的孔上时，由于这种成型浇口需要较大的注射压力，因此非常容易产生毛刺。

Compared with the projected area of molded parts, if the clamping force is small, there will be a gap between the moving die and the static die due to the injection pressure, which will inevitably produce burrs. Especially when the side gate is placed on the hole close to the center of the part, it is very easy to produce burrs because this molding gate requires large injection pressure.

降低注射压力或增加夹紧力可以这种缺陷。如果根据具体情况切换到流动性好的低压成型，有时会非常有效。

This defect can be eliminated by reducing the injection pressure or increasing the clamping force. It is sometimes very effective to switch to low-pressure forming with good fluidity according to specific conditions.

2.注塑模具变形引起

2. Caused by deformation of injection mold

如果模具的原始度不足，则会因注射压力而偏移。如果中心附近有孔，则孔周围会产生毛刺。当使用中心孔打开侧门时，也会产生该孔和流道的周边。毛刺。由于该原因而产生的毛刺是由于不良的模具制造造成的，因此难以修复。加固模具可以减少毛刺。

If the original degree of the mold is insufficient, it will be offset due to the injection pressure. If there is a hole near the center, burrs will be generated around the hole. When the center hole is used to open the side door, the periphery of the hole and runner will also be generated. skin needling. The burr caused by this reason is caused by poor mold manufacturing, so it is difficult to repair. Strengthening the mold can reduce burrs.

3.塑料流动性太好

3. The fluidity of plastics is too good

仅仅是因为塑料的流动性太好，从理论上讲并不是毛刺的原因。但是，当塑料的流动性太好时，即使是很小的间隙也可能被塑料穿透，因此容易出现毛刺。为了这种毛刺，可以降低熔融温度或注射压力，也可以降低模具温度或注射速度。

It's just that the fluidity of plastic is too good. In theory, it's not the cause of burr. However, when the fluidity of the plastic is too good, even a small gap may be penetrated by the plastic, so burrs are easy to appear. In order to eliminate such burrs, the melting temperature or injection pressure can be reduced, and the mold temperature or injection speed can also be reduced.

4在注塑过程中过多地注入熔融材料

4 excessive injection of molten material during injection molding

这不是故障的直接原因。为了防止收缩，注入过多的熔融材料是错误的。有必要增加成型的注射时间或保持时间（请参阅收缩率）。

This is not the direct cause of the failure. In order to prevent shrinkage, it is wrong to inject too much molten material. It is necessary to increase the injection time or holding time of the molding (see shrinkage).

5.注塑模具表面有异物

5. There are foreign matters on the surface of the injection mold

模具夹紧面上有异物，不可避免地会产生毛刺。为了这个问题，显然必须清洁干净模具的表面，以使夹紧表面闭合。

There are foreign matters on the clamping surface of the die, which will inevitably produce burrs. In order to solve this problem, it is obviously necessary to clean the surface of the die to close the clamping surface.

以上就是济南注塑加工厂家给大家分享的文章，希望对大家有所帮助。

The above is the article shared by Jinan injection molding manufacturer. I hope it will be helpful to you.