The vast majority of tool condition monitoring systems use the motor current instead of the cutting force as the predictor signal. The measured motor current signal is time-dependant and instable. It is difficult to d...The vast majority of tool condition monitoring systems use the motor current instead of the cutting force as the predictor signal. The measured motor current signal is time-dependant and instable. It is difficult to detect the cutting force token signal from such motor current signal. This paper presents a method that uses the wavelet transforms to reconstruct the cutting force token signal from the current signal based on the time frequency analysis of the cutting force signal. The result of the cutting force measurement experiment shows that the proposed reconstruct method could be used to analyze the spindle current and monitor the time-varying cutting force.展开更多
制造设备间的广泛互联、互操作是制造领域实现广泛物联的重要前提.对数控系统进行实时监测,收集数控系统加工参数、刀具几何参数、零件质量检测等异构数据,进行有效地关联监控是目前研究的热点.基于OPC(object linking and embedding fo...制造设备间的广泛互联、互操作是制造领域实现广泛物联的重要前提.对数控系统进行实时监测,收集数控系统加工参数、刀具几何参数、零件质量检测等异构数据,进行有效地关联监控是目前研究的热点.基于OPC(object linking and embedding for process control)UA(unified architecture)连接数控系统,建立基于MTConnect的"适配器-代理(adapter-agent)"通用数控系统实时监控体系.研究实时监控数据模型、通信框架及其访问策略,给出了机床加工过程监控数据的标准数据模型.开发的原型系统在某航空薄壁件的实际加工过程进行实时监控,实现了加工过程数据、离线数据的综合可视化表达,验证了所提出的数控系统信息集成方法的有效性.该方法构建的数据模型清晰地表达了各加工要素,具有很好的可扩展性.展开更多
The transmitting properties of acoustic emission(AE) signal is investigated in order to provide experimental basis for application of AE technique. In the paper, the influences of the geometric shape and material prop...The transmitting properties of acoustic emission(AE) signal is investigated in order to provide experimental basis for application of AE technique. In the paper, the influences of the geometric shape and material properties of the mediums and the bearing type on AE transmission are analyzed for providing the theoretic foundation for selecting the transmission route of AE signal and the fixing location of the AE sensor reasonably. According to the transmitting properties of AE, an apparatus of detecting AE signal for the tool breakage monitoring system has been set up. Its application results show that it is of benefit to improving the sensitivity of the tool breakage monitoring system.展开更多
基金Supported by the State Key Laboratory of Digital Manufacturing Equipment and Technology of China, the National Basic Research Program of China ("973" Project) (Grant No. 2005CB724100)the National Natural Science Foundation of China (Grant No. 50875098)
文摘The vast majority of tool condition monitoring systems use the motor current instead of the cutting force as the predictor signal. The measured motor current signal is time-dependant and instable. It is difficult to detect the cutting force token signal from such motor current signal. This paper presents a method that uses the wavelet transforms to reconstruct the cutting force token signal from the current signal based on the time frequency analysis of the cutting force signal. The result of the cutting force measurement experiment shows that the proposed reconstruct method could be used to analyze the spindle current and monitor the time-varying cutting force.
文摘制造设备间的广泛互联、互操作是制造领域实现广泛物联的重要前提.对数控系统进行实时监测,收集数控系统加工参数、刀具几何参数、零件质量检测等异构数据,进行有效地关联监控是目前研究的热点.基于OPC(object linking and embedding for process control)UA(unified architecture)连接数控系统,建立基于MTConnect的"适配器-代理(adapter-agent)"通用数控系统实时监控体系.研究实时监控数据模型、通信框架及其访问策略,给出了机床加工过程监控数据的标准数据模型.开发的原型系统在某航空薄壁件的实际加工过程进行实时监控,实现了加工过程数据、离线数据的综合可视化表达,验证了所提出的数控系统信息集成方法的有效性.该方法构建的数据模型清晰地表达了各加工要素,具有很好的可扩展性.
基金Supported by the Laboratory of Robotics, Chinese Academy of Sciences
文摘The transmitting properties of acoustic emission(AE) signal is investigated in order to provide experimental basis for application of AE technique. In the paper, the influences of the geometric shape and material properties of the mediums and the bearing type on AE transmission are analyzed for providing the theoretic foundation for selecting the transmission route of AE signal and the fixing location of the AE sensor reasonably. According to the transmitting properties of AE, an apparatus of detecting AE signal for the tool breakage monitoring system has been set up. Its application results show that it is of benefit to improving the sensitivity of the tool breakage monitoring system.
