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Design of an insert type induction heating and cooling system for injection moulding processes

机译：用于注塑工艺的插入式感应加热和冷却系统的设计

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摘要

For some injection moulding processes, the tool must be kept at high temperature when injecting plastic melt. Conventionally, this is achieved by heating the tool with hot oil or water, but heating the entire tool will cause unnecessary energy consumption. Previous studies show that using external induction in order to heat the surface of injection moulding tools is both rapid and energy efficient. However, while using a robot to put the heating coil in front of a tool cavity is very convenient, the tool must be open until heating is finished, making the injection cycle time longer. In addition, repeatedly making the tool surface exposed to too high and low temperatures may quickly damage it. The use of an insert type induction heating coil has thus been proposed to address this issue. Since the heated mass with insert type induction heating is a lot greater than with coil of external induction heating, the former has a slower heating rate on the tool surface, thus extending the life of the tool. In this approach, a coil can heat the tool during the tool opening and ejection process and a cooling channel can also be used to avoid interference with the coil inside the tool, as well as to enable cooling on the cavity surface. This study thus proposes a new tool structure, and a two-cavity tool was fabricated to verify the design concept. The results of a set of experiments show that the coil could heat the tool and achieve temperature uniformity of about 91 %, while the heating rate was about 3 °C/s.
机译：对于某些注射成型工艺，在注射塑料熔体时必须将工具保持在高温下。通常，这是通过用热油或水加热工具来实现的，但是加热整个工具会导致不必要的能耗。先前的研究表明，使用外部感应加热注塑工具的表面既快速又节能。但是，在使用机器人将加热线圈放在工具腔体的前面非常方便时，必须打开工具直到加热完成，这会延长注入周期的时间。此外，反复使工具表面暴露于过高和过低的温度下可能会迅速损坏它。因此，已经提出使用插入式感应加热线圈来解决这个问题。由于插入式感应加热的质量要比外部感应加热的线圈大得多，因此前者在工具表面的加热速度较慢，从而延长了工具的使用寿命。在这种方法中，线圈可以在工具打开和弹出过程中加热工具，冷却通道也可以用来避免与工具内部的线圈发生干扰，并可以在型腔表面进行冷却。因此，本研究提出了一种新的工具结构，并制造了一种两腔工具来验证设计概念。一组实验的结果表明，线圈可以加热工具并达到约91％的温度均匀性，而加热速率约为3°C / s。

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