- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Methodology and implementation of a vision-oriented open CNC system for profile grinding
摘要： CNC systems with the vision function have become very valuable for intelligence machine tools because machine vision is a fast-growing intelligent feature for machines. A novel vision-oriented open CNC system was developed in this study and used in profile grinding machines for the precise machining of parts with contour surfaces, such as complex molds and cutting tools. The system is an innovation to the conventional profile grinding method and enabled the profile error to be visually detected and compensated during the machining process. In this study, a novel design methodology for a machine-vision-oriented CNC system was proposed. An Ethernet-based hardware architecture was constructed for the vision-oriented CNC system. The software characteristics of the developed CNC system were analyzed, including a new type of multi-thread software architecture, a seamless handover approach for multi-thread accessing of the memory space, the integration of the human-machine interface with image processing, and virtual-axis-based online error compensation. The running efficiency test of the software development platforms, time-consumption analysis of the measurement and control in the vision-oriented CNC system, and verification of the effectiveness of the developed vision-oriented CNC system were performed. The results indicate that the proposed vision-oriented open CNC system can effectively fuse image processing with motion control, meet the efficiency requirement, and improve the machining precision of profile grinding. The results are also valuable for developing other machine-vision-based intelligent machine tools.
关键词： Contour error,Profile grinding,Image processing,On-machine measurement,Open CNC,Machine vision
更新于2025-09-23 15:23:52
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A Novel Design of Through-Hole Depth On-Machine Optical Measuring Equipment for Automatic Drilling and Riveting
摘要： In the aerospace manufacturing industry, it is impossible to achieve precise and efficient automatic drilling and riveting for largescale composite board parts. The bottleneck is that the depth detection of rivet holes still relies on manual operation, which seriously affects the assembly efficiency and stability of composite board parts. In order to realize accurate and efficient on-machine automatic measurement for through holes in the automatic drilling and riveting process of largescale composite board parts, this paper presents a novel hole depth measuring device. Its mechanical structure is developed based on our newly designed measurement scheme and optical path, the purpose of which is to convert the hole depth data into displacement data of the probe motion. Its electrical hardware consists of three units: a laser transceiver unit to pick up laser spots; a displacement measuring unit to capture the probe movement in real time; and a driving unit to achieve motion control of the probe. Finally, the experimental results indicated that the proposed method and device are capable of performing automatic measurements for through-hole depth. In addition, factors affecting the measuring accuracy and stability of the device are initially analyzed and discussed, which lay a foundation for subsequent research on error compensation and probe calibration.
关键词： image processing,depth detection,automatic drilling and riveting,through-hole depth,large-scale composite board,on-machine measurement
更新于2025-09-23 15:22:29
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[IEEE 2019 International Conference on Electrical Engineering and Informatics (ICEEI) - Bandung, Indonesia (2019.7.9-2019.7.10)] 2019 International Conference on Electrical Engineering and Informatics (ICEEI) - Determination of Maximum Grid-Connected Photovoltaic Penetration Level Based on Unit Commitment Solution
摘要： This paper demonstrates the use of low-cost off-the-shelf (OTS) microelectromechanical system (MEMS) technology to perform vibration-based in situ monitoring, diagnostics, and characterization of a MEMS microball bearing supported radial air turbine platform. A multimodal software suite for platform automation and sensor monitoring is demonstrated using a three-level heuristic software suite and sensor network. The vibration diagnostic methods used in the platform have applications in rotary microsystems for the early detection of failure, fault diagnosis, and integrated diagnostic systems for feedback-based optimization to increase device performance, reliability, and operational lifetimes. The studied rotary microdevice used a dual OTS accelerometer configuration for dual range parallel redundant vibration analysis. The sensor suite has been used to monitor and detect multiple operational parameters measured optimally in time or frequency domains such as rotor instability, imbalance, wobble, and system resonance. This paper will lay the framework for active diagnostics in future MEMS devices through integrated systems.
关键词： rotating machine stability,Non-destructive,rotating machine measurement,vibration measurement
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE 5th International Conference on Mechatronics System and Robots (ICMSR) - Singapore (2019.5.3-2019.5.5)] 2019 IEEE 5th International Conference on Mechatronics System and Robots (ICMSR) - On-machine Measurement and Compensation of Assembling Gap for 5-axis Friction Stir Welding based on 2D Laser Profilometer
摘要： Gap width control is an important task for friction stir welding (FSW) since assembling gap width greatly influences the welding quality. A new efficient method with on-machine measurement (OMM) system based on 2D laser profilometer has been developed in this paper. The method is divided into three steps. Firstly, kinematics and calibration are analyzed to establish the transform relationship from laser sensor coordinate system to workpiece coordinate system (WCS). Then, width information is obtained by an automatic recognition algorithm. Lastly, compensation strategy based on measurement results is presented. Experiments have been performed to verify the proposed compensation method. The results prove that the method is efficient in improving the accuracy and uniformity of assembling gap width.
关键词： friction stir welding,gap detection,laser profilometer,on-machine measurement
更新于2025-09-16 10:30:52
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Evaluation and compensation of laser-based on-machine measurement for inclined and curved profiles
摘要： On-machine measurement is being applied increasingly commonly to inspect deviations in machining, without removing the workpiece from the machine. A laser-based non-contact method has been introduced to measure complex profiles highly efficiently, but the accuracy of its measurement has not been assessed and compensated for. To improve the accuracy of the measurements of inclined and curved profiles using a laser displacement sensor, this study evaluates and compensates for deviations in the measured values by using compensation strategies. The factors influencing measurement accuracy are analyzed and the phenomenon of secondary reflection is explained on the basis of laser triangulation. For an inclined profile, the strategy whereby angle compensation is carried out followed by displacement compensation is used. For a curved profile, a corrected formula in which the coefficients are calculated according to the measurements is applied. The two patterns of coarse and fine compensation rely on the choice of the correction coefficient determined by the adaptive requirements of assessing accuracy. The results show that the surface roughness, measuring environment, and positional errors are less important than the inclination angle and displacement in affecting the accuracy. For the inclined profile, the measurement accuracy improved to －7.4 μm～＋6.7 μm after compensation. For the curved profile, the deviations decreased by 71.5% and 91.9% compared with the original after coarse and fine compensations, respectively. Furthermore, the compensation strategies can be applied to the measurement of complex profiles in future work.
关键词： Compensation strategy,Secondary reflection,Complex profiles,Laser-based on-machine measurement
更新于2025-09-12 10:27:22
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On-Machine Optical Probe Based on Discrete Rotational Symmetric Triangulation
摘要： In the field of modern manufacturing, probes have been playing a more and more crucial role. However, contact probes are unfit for measuring objects with soft surfaces or very tiny cavities and require radius compensation of stylus. In comparison, noncontact probes such as optical probes do not have to consider these problems and are well-performed in measurement. However, existing optical probes (triangulation) may fail to detect objects with rich spatial structures (due to the occlusion effect) and highly reflective curved surfaces (due to existence of highlight spots). Considering the problems, an optical probe based on discrete rotational symmetric triangulation is proposed in this paper. The emitting laser beam of the probe is the rotational axis and the five receiving optical paths (lenses and mirrors) are rotationally symmetrically distributed around the laser axis and are coimaged on a CMOS camera. Results of simulations and experiments show that the new-established prototype is designed with good robustness under various conditions such as different surface characteristics and different inclination degrees. The probe enables conducting real-time on-machine measurement without directional dependency with a resolution of 39 ???? and repeatability accuracy of 0.72 ????.
关键词： robustness,on-machine measurement,optical probe,noncontact measurement,discrete rotational symmetric triangulation
更新于2025-09-04 15:30:14