提高液压仿形刀架控制性能的研究

发布时间：2018-03-05 13:19

本文选题：液压仿形刀架　切入点：结构参数　出处：《沈阳工业大学》2012年硕士论文　论文类型：学位论文

【摘要】：液压仿形刀架因其结构简单、可靠性高、经济性好等优点广泛应用于非圆回转体类零件及各类模具的加工。液压仿形刀架是机液位置伺服控制系统的典型应用,由靠模和刀架两部分组成,刀架由滑阀和差动缸刚性连接而成。靠模通过与滑阀相连接的触头将外形变化传递给刀架,从而加工出所需零件。液压仿形技术很早就被我国引进,一直沿用至今,现有的液压仿形刀架的仿形速率低、加工精度差、切削力小且很难加工出截面复杂的零件,又因其结构特殊,滑阀与差动缸为一整体,加工成型后结构参数不可调节,控制性能也就不可调节。基于上述原因,对液压仿形刀架进行理论上的研究,为液压仿形刀架控制性能的提高提供一些理论依据是很有必要的。根据液压仿形刀架的工作特点,选用正开口双边滑阀与差动缸,将两者刚性连接,通过连杆形成反馈构成闭环控制系统。依据古典控制理论建立液压仿形刀架的数学模型,得出系统的传递函数,根据传递函数并结合一组实际参数对系统进行动静态特性分析及计算机仿真。通过动静态特性分析,了解结构参数对系统开环放大系数、固有频率、阻尼比以及系统刚度的影响,并由MATLAB软件中的Simulink仿真模块得出系统的仿真曲线,根据仿真曲线分析结构参数对系统控制性能的影响。通过选择合理的结构参数可以提高液压仿形刀架的控制性能,从而提高液压仿形刀架的仿形速率及加工精度。通过对液压仿形刀架的深入研究,可以为液压仿形刀架的设计及结构参数的设计提供理论依据,对液压仿形刀架控制性能的改善有一定指导意义。
[Abstract]:Because of its simple structure, high reliability and good economy, the hydraulic copying tool holder is widely used in the machining of non-circular rotary parts and all kinds of dies. The hydraulic copying tool holder is a typical application of the servo control system of the hydraulic position of the machine. The tool holder is made up of sliding valve and differential cylinder rigid connection. The shape change is transmitted to the tool holder by the contact connected with the slide valve, so that the required parts can be machined. The hydraulic copying technology was introduced into our country very early. Until now, the existing hydraulic copying tool holder has low copying rate, poor machining accuracy, small cutting force and difficult to produce complex cross-section parts. Because of its special structure, the slide valve and differential cylinder are a whole. The structure parameters can not be adjusted and the control performance can not be adjusted after machining. For the above reasons, it is necessary to provide some theoretical basis for the improvement of the control performance of the hydraulic copying tool holder through the theoretical research on the hydraulic copying tool holder. According to the working characteristics of hydraulic copying tool holder, two side slide valve and differential cylinder are selected, which are rigidly connected to each other, and the closed-loop control system is formed by feedback of connecting rod. The mathematical model of hydraulic copying tool holder is established according to classical control theory. According to the transfer function and a group of actual parameters, the dynamic and static characteristics of the system are analyzed and simulated by computer. Through the analysis of the dynamic and static characteristics, the open loop magnification factor and natural frequency of the system are obtained by the structural parameters. The damping ratio and the stiffness of the system are affected, and the simulation curves of the system are obtained from the Simulink simulation module in the MATLAB software. According to the simulation curve, the influence of structural parameters on the control performance of the system is analyzed. The control performance of the hydraulic copying tool holder can be improved by selecting reasonable structural parameters, thus the copying rate and machining accuracy of the hydraulic copying tool holder can be improved. Through the deep study of the hydraulic copying tool holder, it can provide the theoretical basis for the design of the hydraulic copying tool holder and the design of the structural parameters, and has certain guiding significance for the improvement of the control performance of the hydraulic copying tool holder.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH137

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