论文部分内容阅读
全塑壳电视机生产的发展,对塑壳注射模具的质量和寿命提出了较高的要求.由于电视机塑壳的形状、尺寸和结构比较复杂,塑壳模具的设计、结构、制造等方面有其自己的特点。本文仅讨论大型注射模具的精度问题.一、对塑壳注射模的要求热塑性塑壳的注射成型过程是将熔融状态的塑料,经注射机活塞加压注射到模具型腔中,冷却固化后成型。注塑过程中,活塞对塑料施加的压力是很高的。例如ABS塑料的注射压力为800～1200kgf/cm~2经过喷嘴、浇道等的减压,模腔中的塑料实际压力也
The development of all-plastic shell TV sets has put forward higher requirements on the quality and service life of the plastic shell injection mold.As the shape, size and structure of the plastic shell are complex, the design, structure and manufacture of the plastic shell mold Have their own characteristics. This article only discusses the accuracy of large injection mold problems.One, the requirements of the plastic shell injection mold Thermoplastic shell injection molding process is the molten state of the plastic, injection molding machine piston injection pressure into the cavity, after cooling solidification molding . The pressure exerted by the piston on the plastic during injection molding is high. For example, ABS plastic injection pressure of 800 ~ 1200kgf / cm ~ 2 through the nozzle, runner and other decompression, the actual plastic cavity pressure is also