纤维增强薄壁塑件翘曲变形分析

The Analysis of the Warpage of Thin-wall Plastic Part for Fiber Reinforced Plastic

选取平均壁厚为1 mm薄壁塑件为研究对象,并选取不同玻璃纤维含量的塑料,以塑件翘曲变形最小为优化目标,采用模流分析软件Moldflow并结合正交实验法分析研究了玻纤含量和模具温度、熔体温度、注射时间等工艺参数对塑件翘曲变形的影响,得到了最优的工艺参数组合和玻纤含量。结果表明:玻纤含量和注射时间是影响塑件翘曲变形的显著因素。使塑件翘曲变形最小的注塑成型工艺方案为模具温度65℃、熔体温度260℃、注射时间2s、保压压力85 MPa、保压时间4 s、玻纤含量10%。适当的玻纤含量可以明显减小薄壁塑件的翘曲变形。

The thin-wall plastic part with average thickness of 1 mm was selected as the researched object, and plastics of different glass fiber content were selected. Aiming at achieving minimum warpage, and the mold flow analysis software Moldflow combined with the orthogonal experimental method was used to study the effects on the warpage of the plastic part due to glass fiber content and mold temperature, melt temperature, injection time and other parameters, and the optimal process parameters combination and glass fiber content were obtained. The results showed that glass fiber content and injec- tion time are significant factors affecting the warpage of the plastic part. The injection molding process scheme which genera- ted minimum warpage of the plastic parts smallest is one at mold temperature 65 ℃, melt temperature 260 ℃, injection time 2 s, packing pressure 85 MPa, packing time 4 s, and glass fiber content 10%. It is concluded that appropriate content of glass fiber can obviously reduce the warpage of the thin-wall plastic part.