【作者】 陈亚萍；

【导师】 叶春生；

【作者基本信息】 华中科技大学 ， 材料加工工程， 2007， 硕士

【摘要】 当前快速成形(RP)技术领域,基于喷射技术的“新一代RP技术”已经取代基于激光技术的“传统的RP技术”成为了主流;快速制造的概念已经提出并得到了广泛地使用。熔融沉积成型(FDM)就是当前使用最广泛的一种基于喷射技术的RP技术。本文主要对FDM温度控制系统进行了深入的分析和研究。温度测控在食品卫生、医疗化工等工业领域具有广泛的应用。随着传感器技术、微电子技术、单片机技术的不断发展,为智能温度测控系统测控功能的完善、测控精度的提高和抗干扰能力的增强等提供了条件。本系统采用的AT89C52单片机是一高性能的8位机,具有丰富的硬件资源和非常强的抗干扰能力,特别适合构成智能测控仪表和工业测控系统。本系统对AT89C52单片机硬件资源进行了开发,采用集成温度传感器AD590实现对温度信号的检测,充分利用单片机的硬件资源,以非常小的硬件投入,实现了对温度信号的精确检测与控制。文中首先阐述了温度控制的必要性,温度是工业对象中的主要被控参数之一,在冶金、化工、机械、食品等各类工业中,广泛使用各种加热炉、烘箱、恒温箱等,它们均需对温度进行控制,成型室及喷头温度对成型件精度都有很大影响。然后详细讲解了所设计的可控硅调功温度控制系统,系统采用AT89C52单片机作微控制器构建数字温度控制器,调节双向可控硅的导通角,控制电压波形,实现负载两端有效电压可变,以控制加热棒的加热功率,使温度保持在设定值。系统主要包括:数据的采集,处理,输出,系统和上位机的通讯,人机交互部分。该系统成本低,精度高,实现方便。该系统加热器温度控制采用模糊PID控制。模糊PID控制的采用能够在控制过程中根据预先设定好的控制规律不停地自动调整控制量以使被控系统朝着设定的平衡状态过渡。更多还原

【Abstract】 In the present field of Rapid Prototyping, the "New RP Technology" based on jetting technology is replacing the "Conventional RP Technology" based on laser technology as the mainstream of the Rapid Prototyping Technology. Fused Deposition Modeling (FDM) is the most popular Rapid Prototyping technology based on jetting technology.This paper mainly does research deeply on the temperature control system of FDM system. Temperature controlling is widely to food, sanitation, medical treatment, chemistry and industry. Along with the development of sensor technology, micro-electronics technology and singlechip technolog, brainpower temperature controlling system is perfected, precision of measurement and controlling is enhanced and the ability of anti-jamming is swelled. Singlechip AT89C52 in this paper is a high-powered 8-bit chip. It has plenty of hardware resource and strong ability for anti-jamming. It is specially suitable for making brainpower measurement instrument and industry controlling system. The hardware resource of singlechip AT89C52 is fully exploited in this paper. This system realizes precise measurement and controlling of temperature signal with a little hardware resource.First, the need of temperature control is expounded. Temperature is a main control parameter in industrial object. Various calefaction stoves, ovens and constant temperature boxes which all need control temperature are widely used in many industry such as metallurgy, chemistry, mechanism and foodstuff. Moulding room and spout temperature awfully affect the precision of moulding pieces. Then the temperature control system using controllable silicon is explain in detail. This system adopts singlechip AT89C52 which acts as microcontroller. It can regulate the angle of double-direction controllable silicon and control voltage wave shape. So the virtual voltage of load can be changed and the calefaction power of calefaction stick can be controlled. Therefore the temperature can retain the enactment value. This system mainly consists of collection of data, disposal, output, communication of system and computer and communication of human and machine. This system has some advantages such as low cost, high precision and convenience realization.This system adopts blury PID control. The adoption of blury PID control can ceaselessly autoregulates basing initialized control rule, thus the controlled system will move to the initialized balance state.更多还原