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浙江大学学报(工学版)
机械工程     
水辅成型浮动芯注射对制品残余壁厚的影响
丁加新, 陈英龙, 周华
浙江大学 流体动力与机电系统国家重点实验室,浙江 杭州 310027
Effect on residual wall thickness of parts with floating core injection of water-assisted injection molding
DING Jia-xin, CHEN Ying-long, ZHOU Hua
State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University,Hangzhou 310027, China
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摘要:

针对水辅成型不同注射方法对制品残余壁厚的影响差异问题,提出基于计算流体力学(CFD)的残余壁厚分析方法.根据水辅成型过程中水与高温塑料熔体的流动特点,分别建立浮动芯注射法和直接注射法的两相流动CFD模型,对残余壁厚的形成过程进行数值模拟,对比数值模拟结果与试验结果,分析残余壁厚分布情况.结果表明,数值模拟结果与试验结果较吻合,验证了模型的正确性.相比直接注射法,浮动芯注射法能够控制制品的残余壁厚,并且残余壁厚大小受延迟时间的影响较小,延迟时间越短,残余壁厚越接近理想控制值.浮动芯注射法制品转弯处的内外侧壁厚差小于直接注射法,有利于提高制品力学性能.

Abstract:

A residual wall thickness analysis method based on computational fluid dynamics (CFD) was proposed for the difference in residual wall thickness of parts with different injection methods of water-assisted injection molding (WAIM). According to the flow characteristics of water and high-temperature plastic melt in process of WAIM, the two-phase flow CFD model of floating core injection and direct injection was established respectively for the numerical simulation of forming process of residual wall thickness. The numerical simulation results were compared with experimental results, and the distribution of residual wall thickness was analyzed. Results show that the numerical simulation agreed with the experimental results, verifying the validity of CFD model. Compared with the direct injection, the floating core injection can control residual wall thickness of parts, and its size is less affected by delay time. The shorter the delay time is, the closer to the ideal control residual wall thickness is. Difference in internal and external wall thickness with floating core injection is smaller than that with direct injection in curve parts, improving parts mechanical property.

出版日期: 2017-05-01
CLC:  TQ 320.6  
基金资助:

国家自然科学基金创新研究群体科学基金资助项目(5121004).

通讯作者: 周华,男,教授,博导. ORCID: 0000-0001-8375-3291.     E-mail: hzhou@sfp.zju.edu.cn
作者简介: 丁加新(1991—),男,硕士生,主要从事流体传动与水辅成型等研究. ORCID: 0000-0001-6510-0713. E-mail: dingjx888@foxmail.com
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引用本文:

丁加新, 陈英龙, 周华. 水辅成型浮动芯注射对制品残余壁厚的影响[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008-973X.2017.05.013.

DING Jia-xin, CHEN Ying-long, ZHOU Hua. Effect on residual wall thickness of parts with floating core injection of water-assisted injection molding. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008-973X.2017.05.013.

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