工艺参数对高光制品收缩及翘曲变形的影响

为了分析工艺参数对大型平板高光无痕注射成型(RHCM)制品收缩及翘曲变形的影响,以空调柜机出风面板RHCM产品开发为例,利用MOLDFLOW软件建立RHCM有限元模型并进行模拟分析,采用田口实验设计方法分析工艺参数对产品综合质量的影响,采用单因素实验方法分析了模具温度对制品收缩和翘曲变形的影响,以及不同模具温度下工艺参数对制品收缩和翘曲变形的影响.结果表明:工艺参数对制品综合质量影响的大小顺序依次为熔体温度、保压压力、加热时间、保压时间、冷却时间、注射时间;当模具温度升高到材料的玻璃化转变温度并进入RHCM区域时,制品的体积收缩率和翘曲变形量呈减小的变化趋势,当加热时间为35s时,制品的综合质量最好;在不同的模具温度下,制品的收缩率和翘曲变形量随熔体温度的升高而呈现出准线性增长的变化趋势,随保压压力的增大而减小,随保压时间的增加而呈小幅波动变化.

Effect of Process Parameters on Shrinkage and War Page of Rapid Heat Cycle Molding Plastic Part

Abstract： In order to define the effect of process parameters on shrinkage and war page of large flat plastic parts by rapid heating cycle molding (RHCM), taking an air conditioning panel plastics as an example, MOLDFLOW was used to establish the finite element model and to conduct simulation and analysis. By using Taguchi methods, the effect of process parameters such as melt temperature, packing pressure, heating time, packing time, cooling time and injectiontime on the comprehensive quality was studied. The single factor experiment method was applied to analyze the effect of mold temperature on shrinkage and war page. Besides, the influence law of other process parameters on shrinkage and war page at different mold temperatures was also studied. The results show that volumetric shrinkage and war page decrease apparently with mold temperature rising to the thermal deformation temperature of the polymer material. The comprehensive quality is the best of all when the heating time is 35 s. At different mold war page temperatures, volumetric shrinkage and war page of the product increase quasi linearly with the melt temperature rising, but decrease with the packing pressure increasing. However, they fluctuated within a narrow range with the packing time increasing.