摘要:
注塑件的表面质量关系到注塑件的后续加工及产品寿命,为了消除注塑件表面的缺陷与变形,提出了蒸汽直接加热模具型腔的模具温度控制原理,并研制出了相应的高光模具温度控制设备。该设备由高温水蒸气和高温干空气制备两大系统构成。其工作过程为:首先将经过去除杂质和离子的高温水蒸汽通入模腔,并将模面加热到设定温度,然后将高温干空气通入模腔,吹除模腔中的残余冷凝水。通过可编程序控制器实现对高温水蒸汽和高温干空气通入模腔的先后顺序与通入时间进行精确控制,最后使模面达到注塑要求所需的温度。该方法只加热模面及以下1 mm～2 mm厚的模芯,故极大地缩短加热时间和减少用电量;由于前后模模面均被加热,使融胶的流动性增强、融胶前锋温度和压力增高,消除了注塑件表面缺陷和变形。
Abstract:
The surface quality of injection molding parts relates to the followup processing and product life. In or der to eliminate the defects and distorsion of the surface, the method of mould temperature control for directly heat ing the mold cavity by steam is presented, and the corresponding equipment was developed. This device is made of two subsystemswater steam purifying system and air cleansing system, it works in the way： the high temperature and pressure steam is passed into mold cavity to heat the surface of mold cavity, then the hot air is put into the mold cavity for clearing away the residual condensed water Programmable logic controller （PLC） is used to con trol the order and duration of the steam and the hot air, until the surface temperature reach the desired temperature. In this method,the metal of mould cores are heated for depth of only 1 mm ~ 2 mm form mold surface, so it only needs the very shorter warmup time and less electricity. The flow ability of meolten plastic, the temperature and pressure of the of its front are very high in this heating way, so the distorsion and the surface defects of the injection molding parts can be eliminated.
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