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基于PLC的短板精冲自动控制系统设计与研究

发布时间:2018-10-10 07:26
【摘要】:随着我国“人口红利”的消失和产业结构的调整,以人工送料为主的劳动密集型简单精冲生产模式面临着越来越大的挑战。本论文选取广大中、小型精冲生产企业广泛采用的短条料精冲生产为对象,设计和开发了一种具有精冲力学参数在线监测和模具保护功能的短板精冲自动控制系统。论文的研究成果能在自动模具故障识别和模具保护的基础上实现短条料精冲自动控制,为我国精冲自动化水平的整体提高提供了一种解决方案,具有一定的理论意义和实用价值。本研究首先综述了精冲工艺过程及国内外精冲自动化的研究情况,根据我国精冲自动化的发展情况,结合中、小型企业精冲自动化的客观要求,确定以短条料精冲自动控制系统的实现为研究对象。从精冲自动化、精冲自动送料、精冲模具保护和精冲力学参数在线监测四个方面全面分析了精冲生产对自动控制系统的需求。通过模拟量高速采样模块分别获取了正常工况与故障工况下精冲主冲裁力、压边力、反压力的实时动态曲线,并进行了数据平滑滤波、平移处理与小波多尺度分解分析及对比分析研究,在此基础上分析和归纳了一种模具保护策略。最后以一台普通四柱液压冲床配合液压精冲模架的简单精冲设备为对象,设计和开发了一种基于PLC的短板精冲自动控制系统,该系统能在实现精冲生产过程自动控制的同时,具有自动精密步距送料、精冲模具保护和力学参数在线监测等功能。研究表明,通过以PLC为主控制单元的精冲自动化控制系统可以解决中小型精冲企业自动化生产问题。论文研究成果对于完善单机精冲自动化控制系统、模具保护策略、精冲设备安全保护提供了切实可行的依据,为后续精冲生产信息化的实现奠定了基础。
[Abstract]:With the disappearance of "demographic dividend" and the adjustment of industrial structure in China, the labor-intensive simple fine blanking production mode, which is dominated by manual feeding, is facing more and more challenges. In this paper, an automatic control system for fine blanking of short strip is designed and developed, which has the functions of on-line monitoring of mechanical parameters of fine blanking and die protection. The research results of this paper can realize the automatic control of short strip blanking on the basis of automatic die fault identification and die protection, and provide a solution for improving the automation level of fine blanking in our country as a whole. It has certain theoretical significance and practical value. This research first summarizes the process of precision stamping and the research situation of precision stamping automation at home and abroad. According to the development of precision stamping automation in China, combined with the objective requirements of precision stamping automation in small and medium-sized enterprises. The research object is the realization of automatic control system for short strip blanking. The requirements of automatic control system for precision blanking production are analyzed from four aspects: precision blanking automation, precision blanking automatic feeding, precision punching die protection and on-line monitoring of precision punching mechanical parameters. The real time dynamic curves of blanking force, blank holder force and reverse pressure under normal working condition and fault condition are obtained by high speed sampling module of analog quantity, and the data smoothing filtering is carried out. On the basis of translation processing, wavelet multi-scale decomposition analysis and comparative analysis, a mould protection strategy is analyzed and concluded. Finally, taking a simple precision punching equipment of a common four-column hydraulic punching machine with hydraulic precision die holder as an object, a short plate precision blanking automatic control system based on PLC is designed and developed. The system can realize automatic control of fine blanking production process at the same time. With automatic precision step feeding, precision die protection and mechanical parameters online monitoring and other functions. The research shows that the automatic production problem of small and medium-sized precision punching enterprises can be solved by the precision blanking automation control system with PLC as the main control unit. The research results of this paper provide a practical basis for the improvement of automatic control system of single machine precision punching, die protection strategy and safety protection of precision punching equipment, and lay a foundation for the realization of information technology for subsequent fine blanking production.
【学位授予单位】:武汉纺织大学
【学位级别】:硕士
【学位授予年份】:2015
【分类号】:TG385.9

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