Surface roughness of pyroclastic deposits at Mt. Etna by 3D laser scanning

The three-dimensional (3D) model of erosion state of blast furnace (BF) hearth was obtained by using 3D laser scanning method. The thickness of refractory lining can be measured anywhere and the erosion curves were extracted both in the circumferential and height directions to analyze the erosion characteristics. The results show that the most eroded positions located below 20# tuyere with an elevation of 7700 mm and below 24#–25# tuyere with an elevation of 8100 mm, the residual thickness here is only 295 mm. In the circumferential directions, the serious eroded areas located between every two tapholes while the taphole areas were protected well by the bonding material. In the height directions, the severe erosion areas located between the elevation of 7600 mm to 8200 mm. According to the calculation, the minimum depth to ensure the deadman floats in the hearth is 2581 mm, corresponding to the elevation of 7619 mm. It can be considered that during the blast furnace production process, the deadman has been sinking to the bottom of BF hearth and the erosion areas gradually formed at the root of deadman.

Download Full-text

A survey of applications with combined BIM and 3D laser scanning in the life cycle of buildings

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing ◽

10.1109/jstars.2021.3068796 ◽

2021 ◽

pp. 1-1

Author(s):

Jingbin Liu ◽

Dong Xu ◽

Juha Hyyppa ◽

Yifan Liang

Keyword(s):

Life Cycle ◽

Laser Scanning ◽

3D Laser Scanning

Download Full-text

The Exploration and Practice of 3D Laser Scanning in the Safety Detection of Beijing Bell and Drum Towers

Proceedings of the 2020 3rd International Conference on Geoinformatics and Data Analysis ◽

10.1145/3397056.3397076 ◽

2020 ◽

Author(s):

Xunhu Zhang ◽

Xiaojuan Wei

Keyword(s):

Laser Scanning ◽

3D Laser Scanning

Download Full-text

Application of Taguchi and Response Surface Methodologies for Surface Roughness in Rotary Tool Polishing Hardness Mould Steels

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.87.82 ◽

2011 ◽

Vol 87 ◽

pp. 82-89

Author(s):

Potejanasak Potejana ◽

Chakthong Thongchattu

Keyword(s):

Surface Roughness ◽

Response Surface ◽

Laser Scanning ◽

Cutting Speed ◽

Optimal Level ◽

Confocal Laser ◽

Milling Machine ◽

Cnc Milling ◽

Polishing Process ◽

Cnc Milling Machine

This research proposes a new application of 3-axis CNC milling machine for polishing the 60 HRC hardness steels. The rotary polishing tools are designed by refer to the end-mill ball nose’s design. The diamond powder are coated in rotary polishing tools by resinoid bonding method and concentrated in 4.4 karat/cm2. The Zig-milling tool paths are used to polish the hardness steel. After polishing, the confocal laser scanning microscope is used to analyze the arithmetic mean surface roughness of the hardness steels. The L12 orthogonal array of the Taguchi’s method is selected to conduct the matrix experiment to determine the optimal polishing process parameters. The diamond grit size and cutting speed of the rotary polishing tools, feed rate and step over of the tool path, the depth of polishing process penetration, and polishing time are used to study. The combination of the optimal level for each factor of the hardness steel polishing process are used to study again in the confirmation experiment. The predicted signal to noise ratio of smaller - the better under optimal condition are calculated by using the data from the experiment. The combination of the optimal level for each factor are used to study again in the confirmation experiment and the result show that polishing time was a dominant parameter for the surface roughness and the next was depth of penetration. The response surface design is then used to build the relationship between the input parameters and output responses. The experimental results show that the integrated approach does indeed find the optimal parameters that result in very good output responses in the rotary polishing tools polished hardness mould steel using CNC milling machine. The mean surface roughness of hardness steel polishing process is improved by the diamond rotary tools with the 3-axis CNC milling machine.

Download Full-text