微注塑成型中,聚合物熔体与微型腔壁面间的对流换热行为与常规注塑成型不同,对流换热系数也发生了变化。通过采用微模具和温度传感器,对聚丙烯（PP）、ABS和两种聚甲醛（POM）熔体,以不同注射速度填充厚度为0.510 mm和0.420 mm,表面粗糙度为0.062μm、0.393μm和0.695μm的不同微型腔时的模具温度分布进行测量,从而求得对流换热系数。结果表明,微注塑成型中对流换热系数,与聚合物材料热物理性质紧密相关,热物性参数值高的材料,对流换热系数也大;且随注射速度和型腔表面粗糙度的增加以及型腔厚度的减小而增大。
In micro injection molding,the convective heat transfer behavior between the polymer melt and the wall of micro mold cavity is different from the conventional injection molding,the convective heat transfer coefficient has changed.With application of micro mold and temperature transducer,the mold temperature distribution of polypropylene（PP）,acrylonitrile-butadiene-styrene（ABS） and two kinds of polyoxymethylene（POM） melt filling the micro-cavity with different injection speed,cavity thickness of 0.510 mm and 0.420 mm,surface roughness of 0.062 μm,0.393 μm and 0.695 μm was experimentally measured.Then the convective heat transfer coefficient was calculated.The results indicate that,the convective heat transfer coefficient is closely related to the thermo-physical properties of polymer materials,thermal properties of materials with high values has a higher convective heat transfer coefficient.At the same time,it is increased obviously with the increase of injection speed,surface roughness of the cavity and the decrease of the thickness.
参考文献
| [1] | L.Yu;L.J.lee;K.W.Koelling .Flow and Heat Transfer Simulation of Injection Molding With Microstructures[J].Polymer engineering and science,2004(10):1866-1876. |
| [2] | 庄俭,于同敏,王敏杰,刘莹.微注塑成型中对流换热系数对熔体充模流动的影响[J].高分子材料科学与工程,2007(06):169-172. |
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