在对模具进行注塑加工时，比较容易出现的问题是制品收缩。这是为什么呢？我们要怎么这个问题呢？
In the mold injection processing, the problem is more prone to shrinkage. Why is that? How can we solve this problem?
模具缺陷
Mold defects
对此，浇口和流道截面应根据具体情况适当扩大，浇口位置应尽量对称设置，进料口应设置在塑件壁厚部分。如果在离浇口较远的地方出现凹痕和缩痕，原因通常是模具结构中某处的熔体流动不畅，阻碍了压力传递。对此，模具浇注系统的结构尺寸应适当扩大，流道应尽量延长出现凹陷的部位。
In this regard, the gate and runner section should be appropriately expanded according to the specific situation, the gate position should be set symmetrically as far as possible, and the feed inlet should be set in the wall thickness part of the plastic parts. If dents and indentations occur further away from the gate, they are usually due to poor melt flow somewhere in the mold structure, impeding pressure transfer. In this regard, the structural size of the casting system should be appropriately expanded, and the runner should be extended to the sunken part as far as possible.
机台问题
The machine problem
喷嘴孔过大，熔料会倒流收缩，过小，阻力过大，出料量不足。如果合模力不足，毛边也会收缩，所以
济南注塑模具认为检查合模系统是否有问题。塑化量不足，应选用塑化量大的机器，检查螺杆、机筒是否磨损。机器设备的配置和维修检查也不马虎，加工中心、精雕等精密模具生产设备，还有各类注塑机，从设计开模到注塑，每一个环节严格把控，目的是提供更、更完善的服务。
If the nozzle hole is too large, the molten material will backflow and shrink. If the nozzle hole is too small, the resistance is too large and the discharge quantity is insufficient. If the clamping force is not enough, the burr edge will shrink, so Ji 'nan injection mold thinks that check whether there is a problem with the clamping system. If the plasticizing quantity is insufficient, the machine with large plasticizing quantity should be selected to check whether the screw and barrel are worn. Machine equipment configuration and maintenance inspection is not careless, processing center, precision carving and other precision mold production equipment, as well as all kinds of injection molding machine, from design to mold injection, each link is strictly controlled, the purpose is to provide more professional, more perfect service.
加工方面
processing
料筒温度过高，体积变化大，特别是前炉温度。对于流动性较差的塑料，应适当提高温度以保证光滑度。注射压力、速度、背压太低，注射时间太短，使物料体积或密度不足而收缩压力、速度、背压过大，时间过长，造成飞边和缩水。加料量，即缓冲垫过大时，会消耗注射压力，过小时，加料量不足。对精度要求不高的零件，注射保压后，外层基本凝结硬化，夹层部分仍较软可顶出，尽快脱模，使它可以在空气或热水中缓慢冷却，可使缩孔平滑，不显眼，不影响使用。
The barrel temperature is too high, and the volume changes greatly, especially the temperature of the front furnace. For plastic with poor fluidity, temperature should be appropriately raised to ensure smoothness. Injection pressure, speed, back pressure is too low, injection time is too short, so that the material volume or density is insufficient and the shrinkage pressure, speed, back pressure is too large, too long, resulting in flapping and shrinkage. The amount of feeding, that is, when the cushion is too large, it will consume the injection pressure, too small, the amount of feeding is insufficient. For parts with low precision requirements, after injection, the outer layer is basically condensed and hardened, and the sandwich part is still soft and can be pushed out as soon as possible, so that it can be cooled slowly in air or hot water, and the shrinkage cavity can be smooth, unobtruded and does not affect the use.
In addition, raw materials do not meet the requirements of molding, the unreasonable structural design of plastic parts is also the reason for the shrinkage phenomenon of injection mold processing, we must pay more attention to all aspects of the line, more exciting content to http://www.sdlqmj.com our website to understand it!
