对注塑机的控制-外文翻译原文及译文.docVIP

外文翻译原文及译文 学 院 专 业 班 级 学 号 姓 名 指导教师 负责教师 xxxx大学 2014年6月On the control of plastic injection molding machine Modern plastic injection molding machine is a set of mechanical, electrical and fluid in one typical system, as this device has forming complex products, less post-processing, processing characteristics of the plastic variety, since its inception has grown rapidly, the current full Over 80% of the worlds products are used plastic injection molding machine for processing. Conventional injection molding machines generally use a simple open-loop control, that is, in accordance with a pre-set value of control. In the device manufacturing process, pre-configured parameter values, such as the clamping force, cycle time, temperature, etc., from the machine in the production process be maintained. For example, by controlling the die temperature can be maintained the temperature of heating fluid, plastic temperature can be outside the heating device by controlling the power to maintain. This control method of simple structure, however, poor anti-interference ability to control the temperature is relatively low. At present, more injection molding machine uses a closed-loop control, that is, according to on-line measurement value and set the value of the deviation control. Closed-loop control system uses a negative feedback loop, anti-jamming ability, when the injection speed, injection pressure, mold cavity temperature, cavity pressure, melt temperature and oil pressure due to interference in the production process, deviation of the machine through the adaptive control system for automatic correction of interference. This control method of anti-interference ability, high control accuracy. More advanced control method is to apply computer controlled, that is, to build a closed-loop real-time computer control system. It includes direct digital control system (DDC), supervisory computer control system (SCC), distributed control system (DCS) a