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精密注塑机是如何定义的?_科骏机械
发布时间:2019-07-04 16:34

精密注塑机指的是适于成型生产精密塑胶制品的成型机械设备。对于一台精密注塑机,又该如何去衡量或判断呢? 通常精密注塑机有两个指标:一是制品尺寸的重复偏差,另一个是制品的重复重量偏差。前者由于尺寸大小和制品厚薄不同难以比较。而后者代表了注塑机的综合水平,一般普通注塑机的重量重复误差在1%左右,较好的机器可达到0.8%,低于0.5%为精密机,小于0.3%为超精密机。
 
如前所述,精密注塑机要求制品尺寸精度一般在0.01~0.001mm以内,许多精密注塑还要求注塑机具有高的注射压力、高的注射速度;要求合模系统具有足够大的刚性和锁模精度,所谓锁模精度是指合模力的均匀性、可调、稳定和重复性高,开合模位置精度高;要求对压力、流量、温度、计量等都能控制精确到相应的精度,采用多级注射,保证成型工艺的再现和制品的重复精度等。

As mentioned above, precision injection molding machines require that the dimensional accuracy of products is generally within 0.01 ~ 0.001mm. Many precision injection molding machines also require high injection pressure and high injection speed. The clamping system is required to have enough rigidity and clamping precision. The so-called clamping precision refers to the uniformity, adjustable, stable and high repeatability of clamping force and high precision of opening and closing position. It is required that the pressure, flow rate, temperature and measurement can be controlled accurately to the corresponding precision. Multi-stage injection is adopted to ensure the reproduction of molding process and the repeated precision of products.