Results 11 to 20 of about 486,148 (228)

Trajectory-Based Identification of Rotary-Axis Position-Independent Geometric Errors Considering Excitation Projection Effects [PDF]

Micromachines
Improving the identification accuracy of geometric errors in five-axis machine tools is a critical requirement in advanced manufacturing. Although rotary axes enhance machining flexibility and productivity, they introduce additional geometric errors ...
Songtao He, Seth Osei, Wei Wang, Jiaying Wang, Kaiyuan You, Qicheng Ding, Jiahao Yu   +6 more
doaj   +2 more sources

Design and Vision-Based Calibration of a Five-Axis Precision Dispensing Machine [PDF]

Micromachines
Five-axis precision dispensing machines are employed for semiconductor packaging. The dispensing accuracy is significantly affected by multiple geometric errors among the five axes.
Ruizhou Wang, Jinyu Liao, Binghao Wang, Qifeng Zhong, Yongchao Dong, Han Wang   +5 more
doaj   +2 more sources

A Theoretical and Experimental Identification with Featured Structures for Crucial Position-Independent Geometric Errors in Ultra-Precision Machining

Machines, 2023
In ultra-precision machining (UPM), position-independent geometric errors (PIGEs), i.e., squareness errors, have a crucial impact upon the form accuracy of a machined surface.
Li Zhang, Shaojian Zhang
doaj   +1 more source

PIGE technique implementation at ININ [PDF]

AIP Conference Proceedings, 2015
In this work, we present a general overview about the implementation at ININ of a Particle Induced Gamma Emission (PIGE) analysis technique, based on the bombardment of samples by protons and deuterons at different energies within our tandem accelerator facility.
R. Policroniades, E. Martínez-Quiroz, B. Méndez-Garrido, G. Murillo, E. Moreno, P. Villaseñor   +5 more
openaire   +1 more source

A Recognition Methodology for the Key Geometric Errors of a Multi-Axis Machine Tool Based on Accuracy Retentivity Analysis

Complexity, 2019
This paper proposes a recognition methodology for key geometric errors using the feature extraction method and accuracy retentivity analysis and presents the approach of optimization compensation of the geometric error of a multiaxis machine tool.
Shijie Guo, Shufeng Tang, Dongsheng Zhang   +2 more
doaj   +1 more source

A Ball Bar Measurement Scheme with Single-Axis Rotation Modes for Position-Independent Geometric Error Identification in Dual Rotary Table Five-Axis Machine Tools

Sensors
Position-independent geometric errors (PIGEs) of rotary axes are critical factors limiting the machining accuracy of five-axis machine tools. Aiming at the accurate identification of rotary-axis PIGEs for dual rotary table five-axis machine tools, this ...
Jinlong Zhang, Hongtao Yang, Zhaoyao Shi
doaj   +1 more source

A method of testing position independent geometric errors in rotary axes of a five-axis machine tool using a double ball bar

, 2015
Ensuring that a five-axis machine tool is operating within tolerance is critical. However, there are few simple and fast methods to identify whether the machine is in a “usable” condition.
Xiaogeng Jiang, R. Cripps
semanticscholar   +1 more source

Highly lethal genotype I and II recombinant African swine fever viruses detected in pigs

Nature Communications, 2023
African swine fever virus (ASFV) poses a great threat to the global pig industry and food security. Currently, 24 ASFV genotypes have been reported but it is unclear whether recombination of different genotype viruses occurs in nature.
Dongmin Zhao, En C Sun, Lianyu Huang, Leilei Ding, Yuanmao Zhu, Jiwen Zhang, Dongdong Shen, Xianfeng Zhang, Zhenjiang Zhang, Tao Ren, Wan Wang, Fang Li, Xijun He, Z. Bu   +13 more
semanticscholar   +1 more source

Identification of Position-Independent Geometric Error in Five-Axis Machine Tools Using ANN Surrogate and Optimal Measurement Planning

Machines
Position-independent geometric errors crucially impact the accuracy of five-axis machine tools, yet their identification remains challenging due to computational complexities, inadequate measurement pose selection, and disturbances arising from thermal ...
Seth Osei, Wei Wang, Qicheng Ding, Debora Nkhata   +3 more
doaj   +1 more source

Geometric error compensation method using the Laser R-test

The International Journal of Advanced Manufacturing Technology
Traditional methods for measuring geometric errors in machine tools, including interferometry and Double Ball Bar (DBB), are known to be expensive and time-intensive.
T. Hsieh, W. Jywe, J. Zeng, Chia-Ming Hsu, Yu-Wei Chang   +4 more
semanticscholar   +1 more source