工艺参数对注塑机胀模特性的影响

Influence of Process Parameters on Mold Separation Characteristics of Injection Molding Machine

注射成型过程中,模具在型腔压力的作用下会产生开模的风险,严重影响塑料制品的成型质量。基于全电动和液压式注塑机,系统研究了注射成型过程中锁模力和保压压力对模具胀模特性曲线的影响。实验结果表明,在注塑成型过程中,工艺参数会影响模具的胀模特性,包括锁模力曲线、胀模力曲线及分型面压力;当锁模力设定值低于400 kN时,制品会产生飞边缺陷,分型面压力最小值为0;相关性分析结果表明,分型面压力变化量及分型面压力最小值与制品质量存在强相关性,相关系数分别为0.978和-0.961;分型面压力变化量和分型面压力最小值可表征制品质量,并且,可作为最优锁模力设定的监测参数,作为最佳锁模力设定的依据。

During the injection molding process,there existed a risk of premature mold opening due to the influence of cavity pressure,which had a significant impact on the quality of plastic product formation.A comprehensive investigation was conducted using both all-electric and hydraulic injection molding machines to examine the effects of mold clamping force magnitude and holding pressure variations on the characteristics of mold separation during the injection molding process.Experimental results indicated that changes in process parameters had an impact on the characteristics of mold separation,encompassing the profiles of clamping force,expansion force,and pressure distribution at the parting surface.When the set clamping force fell below 400 kN,products exhibited the undesirable defect of flash,resulting in a minimum pressure of 0 at the parting surface.Correlation analysis revealed a strong relationship between variations in parting surface pressure and the minimum pressure at the parting surface with product quality,with correlation coefficients of 0.978 and-0.961.Both variations and the minimum pressure in parting surface pressure were found to be indicative of product quality and could serve as monitoring parameters for determining the optimal mold clamping force settings,ultimately a foundation was provided for establishing the best practices in mold clamping force configuration.