摘要

本文主要介绍了液压传动技术在塑料注射成型液压机中应用。本液压系统是依据SZ‐350/1200 塑料注射成型的成型工艺所需要的动作循环及对液压系统要求的性能进行设计的。

塑料注射成型机主要用于热塑性塑料的成型加工。在成型加工过程中，要先使粒状塑料在注射—预塑加热筒内熔化成粘稠状态，在此之前合模机构已经闭合，当物料在螺旋推进器前端形成一定压力是，注射机构开始将液状物料高压、快速注射到模具型腔中，经过一段时间保压、冷却后，开模、顶出制品，便完成一个循环。

这个成型制品的工艺要求注射成型机具有以之相适应的工作性能；要求注射成型机具有满足成型工艺的动作程序；要求成型周期短，对各种物料的加工适应性强；要求能制出外形复杂，尺寸精确的制品；要求能实现半自动和全自动。

为了能满足上述的要求，本液压系统的设计除了能满足个工作部件对动力（功率、力和力矩）的要求外，并能实现各工作部件所需的动作、工作循环、速度、无级调速，运动的平稳性和运动精度等。

关键词：液压系统、成型机、热塑性

Abstract

This article primarily describes hydraulic transmission technology in plastic injection molding machine. The hydraulic system is based on the SZ-350/1200 plastic injection molding of prototyping needs action cycle and on the performance of the hydraulic system requirements for design.

Plastic injection molding machine is mainly used for thermoplastic molding process. In molding process, enabling granular plastic injection — pre-plastic heating cylinder melting into sticky State, before this clamping unit has been closed, when the material in a screw propeller in front of the pressure of liquid injection mechanism starts to high pressure, rapid injection material into the mold cavity, after a period of time pressure and, after cooling, tooling, and Crest products, complete a cycle.

This shaping process require injection moulding machine has to fit work performance; requirements for injection moulding machine has a meet of action programs; requirements for short cycle time, on various materials processing adaptable; requirements can be made out of the overall dimensions of the complex, precise products; requirements for semi-automatic and fully automatic.

In order to be able to meet the above requirements, the design of the hydraulic system in addition to being able to satisfy the working parts on power (power, force and torque) requirements, and be able to achieve its working parts of the required actions, duty cycle, speed, speed, motion stationarity and precision, and so on.

Key words: hydraulic system, forming machine, thermoplastic