Dynamic Accuracy Design Method of Ultra-precision Machine Tool

Zha

J Braz. Soc. Mech. Sci. Eng.

2020

Based on the hardness inspiration of the tortoise structure, this study analyzes the innovative application of the parts of ultra-precision machine tools. Aiming at the problems of machining accuracy, efficiency, and machine cost of ultra-precision machine tools, an innovative design and analysis of chuck of ultra-precision machine tools based on carbon fiber-reinforced polymer and its application to turtle shell structure is proposed. Firstly, the G-element model of carbon fiber composites is deduced and analyzed by layered experiments. Secondly, the original parts of ultra-precision machine tool are simulated and analyzed, and the main sixth-order modal of carbon fiber turtle shell structure is deduced. Finally, the structural parameters of carbon fiber composite "turtle shell" were applied to the surface of chuck claw of ultra-precision machine tool, and the results were compared and analyzed. The results show that the maximum displacements of the chuck are all located at the front of the chuck and the maximum displacements and stresses of the chuck are smaller than those of the original chuck. The maximum stress is the most obvious, the difference is about 240.27 MPa, and the first-order mode increases by 23.4% compared with the original mode. The overall relative mass was reduced by 61.2%.

“…Finally, the sixth-order main modes of the chuck mechanical system of the high-speed precision grinder are obtained:{A (1) }, {A (2) }, {A (3) }, {A (4) }, {A (5) } 和 A (6) 。…”

Section: Analysis Of Structural Components Of Turtle Shellmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study on chuck performance of ultra-precision machine tool based on CFRP pair bionic structure

Zha

J Braz. Soc. Mech. Sci. Eng.

2020

“…[24] Other recent works have used radio frequency capacitively coupled plasma (RF-CCP). [25][26][27][28][29][30] These systems are similar to DBD. [11] The work with RF-CCP is more focused on dissociation of CH4 and carbon deposition than on DRM.…”

Section: Introductionmentioning

confidence: 99%

Dry Reforming of Methane under Mild Conditions Using Radio Frequency Plasma

et al. 2020

Dry reforming of methane is a challenging process wherein methane reacts with CO2 to give syngas. This reaction is strongly endothermic, typically requiring temperatures higher than 500 °C. Catalysts can be used, but the high temperatures (which are a thermodynamic requirement) often lead to catalyst deactivation. Here, we approach the reaction from another conceptual direction, using low-power radio frequency inductively coupled plasma (RF-ICP). We demonstrate that this system can give high conversions of methane and CO2 at nearambient temperatures. Importantly, the energy costs in this system are considerably lower compared to other plasma-driven DRM processes. Furthermore, we show that the yield of hydrogen can be increased by minimizing the C2 compound formation. We examine the factors that govern the DRM process and discuss the Hα emission and its influence on the H-atom recycling in the process.

“…One is that the installation of the eccentricity signal is the basic component of the measurement signal, and the other is that the measurement result is not affected by the fundamental error of the rotation error. Chen et al [14] proposed a superpredictive machine DAD method based on frequency domain error distribution, which plays an important role in new super design and manufacturing. Marsh et al [15] demonstrated the application of two methods to separate the spindle error motion and the workpiece roundness on a spindle with an error less than 5 nm.…”

Section: Introductionmentioning

confidence: 99%

Characterization and Evaluation of Rotation Accuracy of Hydrostatic Spindle under the Influence of Unbalance

Zhao

Liu

2020

Shock and Vibration

The paper studies the characterization and evaluation technology of rotation accuracy of hydrostatic spindle under the influence of unbalance. The dynamic model of the motion error of the hydrostatic spindle is established based on the dynamic parameters. The variation law of motion error of spindle rotor is analyzed under the unbalanced mass. The paper finds that with the increase of the spindle speed, the amplitude of the spindle error motion will increase, and the inclination angle θ error is more sensitive to the change in the rotational speed. In the total synthesis accuracy, the proportion of synchronization error decreases with the increase of the rotational speed. Finally, the least squares evaluation algorithm is used to evaluate the rotation error of the hydrostatic spindle, and a method for evaluating the rotation accuracy of the hydrostatic spindle with high calculation accuracy and calculation efficiency is proposed.