整体式热流道热嘴易断裂问题探讨

Discussion on the Problem of Breakable Nozzle of Integral Hot Runner

摘要: 热流道中热嘴断裂严重影响了整体式热流道的使用寿命，制约了热流道技术在模具中的推广和应用，为了解决断裂问题，本文就此展开讨论。结合热嘴自身结构和使用环境因素综合考虑，归纳出四个主要因数：螺纹连接的缺陷、温度的影响、针阀冲击、注射压力，同时对每一种影响因数进行了详细的计算。针对断裂现象提出了三种改进方案。改进后的热流道系统断裂现象明显减少，极大地提高了系统的可靠性和使用寿命。

Abstract: Nozzle fracture of hot runner severely affects the overall service life of hot runner, restricting the promotion and application of hot runner technology in the mold. In this paper, we discussed the fracture problem in order to solve it. Taking into account the structure and use environment of the nozzle, four main factors of the fracture problem were summarized: threaded connection defect, temperature effect, needle valve shock, and injection pressure. And then each impact factor was calculated in detail. Aiming at the fracture, three improvement projects were also proposed. Frac-ture had been reduced significantly in the improved hot runner system, greatly enhancing the re-liability and service life.