共查询到19条相似文献,搜索用时 62 毫秒
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简介了西门子840D数控系统的伺服参数优化方法和原理,分析了目前最终用户的应用问题,提出了在系统轻微磨损状态下伺服参数优化及评估的一些方法。 相似文献
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西门子840D死机故障解决一例 总被引:1,自引:0,他引:1
我单位的数控车削中心的西门子840D数控系统自1998年工作以来,一直工作良好,但有一次出现了死机的情况.笔者将故障的产生及排除过程做以下小结,以供同行参考. 相似文献
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1.驱动优化的必要性
数控系统的主要功能是把编制的NC程序转变成相应轴的机械位移,在轴位移的过程中,好的动态特性和稳定性是驱动稳定高效运行的关键。特别在模具的高速加工中,要求系统有良好的动态和静态特性。 相似文献
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优化直接进给轴伺服参数对提高进给轴抗干扰性能具有重要作用。分析了数控系统中应用伯德图优化伺服参数存在的问题,研究了一种基于动刚度评价的直接进给轴伺服参数优化方法。通过建立直接进给轴动力学模型,给出了基于脉冲激励的动刚度测量方法,依据测量方法确定进给轴动刚度频谱图,建立了直接进给轴伺服系统动刚度模型,分析得到影响动刚度的主要因素,结合动刚度频谱图,给出了伺服参数快速优化策略。优化策略中依据动刚度频谱图判断共振点所在频段,应用电子滤波器抑制共振频段。以驱动系统为SINUMERIK 840D的自构建直线电机进给轴实验平台为对象,进行了伺服参数优化实验,实验结果表明,该方法能有效避免误判共振频段,可直接确认共振点,与应用伯德图优化伺服参数方法相比,优化后使速度环伯德图0dB频段增加58.6Hz,且首个尖峰延后11.7Hz。 相似文献
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针对CAM软件的后处理无法生成SIEMENS840D可执行的钻孔循环,通过对SIEMENS840D系统标准循环的研 究,找到了SIEMENS840D钻孔循环参数设定的意义与方法。 相似文献
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针对利用机床的伺服系统来控制的刀库,以一进口车削中心为例,深入剖析了PLC控制伺服刀库轴的控制原理,并说明了如何实现这个控制。 相似文献
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在数控加工中,零件的加工精度在很大程度上取决于对刀精度。本文基于数控铣床对刀原理及对刀方法,探讨了SIEMENS840D系统数控铣床的对刀方法。 相似文献
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The International Thermonuclear Experimental Reactor remote-handling (ITER-RH) system powered by water hydraulics is a vision of the future. The 2D servo valve is a new type of servo valve, maybe suitable for the ITER-RH system. It has many advantages, including its fast response and strong anti-pollution ability. However, steady flow force is currently considered to be one factor that impacts the dynamic characteristics of servo valves. In this study, the influence of steady flow force on the dynamic characteristics was analyzed, and the structure was optimized accordingly. A mathematical model of the servo valve was built using theoretical analysis and numerical simulation. Results indicated that the amplitude bandwidth of the 2D water hydraulic servo valve was 169 Hz without considering the steady flow force, and it decreased to 162 Hz when the steady flow force was considered. Furthermore, a newly designed valve sleeve, to compensate for the axial steady flow force, was proposed by changing the angle of the inlet port designed in the valve sleeve to the spool axis. The maximum compensation capacity of the axial steady flow force was 35%, and the best angle of the inclined holes was approximately 120°. The optimized amplitude bandwidth of the 2D servo valve was 167 Hz. The results demonstrate that the optimized valve sleeve improved the dynamic response of the 2D servo valve. 相似文献
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This paper proposes an adaptive funnel control scheme for two-inertia servo systems with unknown parameters (e.g., inertia and stiffness coefficient). To improve the transient and steady-state performance, a modified funnel variable, which relaxes the limitation of the original funnel control, is developed by using the tracking error to replace the scaling factor. Then, an error transformation with the new funnel variable is introduced and used in the controller design. An auxiliary filter operation is designed to derive the information of parameter estimation error, which is used as a new leakage term in the parameter update law. Then a sliding mode technique is introduced in the adaption law to achieve finite-time convergence. Appropriate comparison to the gradient descent method is provided concerning with the estimation convergence. Simulation and experimental results are used to illustrate the effectiveness of the devised control scheme. 相似文献
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SIEMENS 840D数控系统钻孔循环的研究 总被引:1,自引:0,他引:1
针对UG、MASTERCAM、CAxA等诸多CAM软件的后处理无法生成SIEMENS 840D可执行的钻孔循环,通过对SIEMENS 840D标准循环的研究,找到了一种方法,并成功地解决了SIEMENS840D钻孔循环参数设定的方法与意义.文章详细的讲述了SIEMENS 840D数控系统中,钻孔循环cycle81、cycle82以及cycle83中各个参数设定的意义和应用方法. 相似文献
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针对常用的Stribeck摩擦指数模型,提出用泰勒高次展开的方法达到非线性摩擦模型的线性化,利用最小二乘拟合的方法得到摩擦模型参数。通过对数控机床控制系统的电动机电流和转速等信号的采集,得到了进给系统中摩擦力矩与转速的对应关系,利用提出的方法进行了辨识实验,实验结果表明,该方法能对Stribeck摩擦模型的参数进行精确的辨识。该方法在工程实际中具有应用价值。 相似文献