【作者】 李永兵；

【导师】 王时龙；

【作者基本信息】 重庆大学 ， 机械制造及其自动化， 2010， 硕士

【摘要】 电镀技术是一种重要的表面处理技术,应用十分广泛,与人们的生活息息相关。在我国,电镀行业企业规模普遍较小,大多数中小型企业仍在使用许多过时的技术和设备,大量的生产线为半自动化控制,甚至有些还是手工生产线,过程可控性差,直接影响产品质量,导致生产效率低,最终结果是企业的经济效益下降。现代市场竞争日趋激烈,企业迫切需要提高生产效率和产品质量的稳定性,于是提高电镀生产线的自动化程度具有重要的意义。本文以多镀种电镀生产线控制系统的研制和应用为目标,通过对国内某企业镀锌、镀铜、镀镍等电镀生产以及金黄色化学氧、脉冲阳极氧化等氧化生产的工艺要求和控制系统技术指标进行了分析后,结合车间的实际情况,将这些镀种整合到同一条生产线上,研制出了应用PROFIBUS现场总线的多镀种电镀生产线分布式分层递阶自动控制系统。在对该生产线控制系统的电气部分进行设计之后,着重对多通道槽液温度检测与控制进行了研究,利用PID控制方法取代了槽液温度传统定点开关控制方法,进而使温度平稳达到目标值,大幅度降低了加热阶段槽液温度的过冲和保温阶段槽液温度的波动,实现了槽液温度的精确控制。同时,还研制了PLC与整流器、变频器的多机实时通讯软件。通过多镀种电镀生产线实际运行表明,槽液温度控制精度高,可达±0.5℃;PLC与整流器、变频器多机通讯实时性好。实践证明,多镀种电镀生产线控制系统采用分布式分层递阶控制结构可靠性高,实用性强,完全可以满足实际生产的需求,提高了电镀产品的质量和生产效率,实现了电镀生产集成自动化。更多还原

【Abstract】 Electroplating technology is an important surface treatment technology, which has been used widely and linked with people’s daily life closely. In China, the scale of electroplating industries is generally small. Most small and medium enterprises are still using outdated technologies and equipments. A large number of production lines are semi-automatic, even some of them are manual, so that product quality is poor, and production efficiency is extremely low. All of these lead to a bad economic efficiency to enterprise. Competition in market is more and more fierce, which causes enterprises urgently to improve production efficiency and stability of product quality, that is why improving the automation of an electroplating production line is great importance.In this paper, research and apply on the control system of multiple automatic electroplating line has been taken as a target. After the analysis of the production process requirements of zinc, copper, nickel plating and oxidation surface treatment of an enterprise in our country, considering the actual situation of the workshop, all kinds of plating were integrated into one production line, and the distributed hierarchical control system with PROFIBUS was developed.After the electrical system design, the emphasis focused on the multi-channel temperature detection and control system of electroplating solution, where taken PID control method instead of the traditional fixed-point switch control method. In this method, not only increased temperature to target value stably, but also temperature overshoot at the end of heating process and fluctuation in holding process was greatly reduced. Furthermore, multi-machine instant communication programs between rectifiers, inverters and PLC were developed.Practical experience of the multiple automatic electroplating line indicates that precision of electroplating solution temperature control is high, which is up to±0.5℃, and multi-machine communication works well. Practice proves that control system of multiple automatic electroplating line by means of distributed hierarchical control structure has high reliability and strong practicality, besides that it fully meets the needs of actual production. Not only did product quality and production efficiency improved, but also realized integrated automation of electroplating.更多还原