Research on surface finish of thin-wall parts by laser with coaxial inside-beam powder feeding

2021 ◽  
Vol 33 (2) ◽  
pp. 022003
Author(s):  
Lin Lu ◽  
Tuo Shi ◽  
Jinchao Zhang ◽  
Youzhu Mei ◽  
Dongji Cheng ◽  
...  
Keyword(s):  
Surface Finish ◽  
Thin Wall ◽  
Powder Feeding

Experimental Study on Surface Integrity, Dimensional Accuracy, and Micro-Hardness in Thin-Wall Machining of Aluminum Alloy

2018 ◽  
Vol 5 (2) ◽  
pp. 13-31
Author(s):  
Gururaj Bolar ◽  
Shrikrishna N. Joshi
Keyword(s):  
Aluminum Alloy ◽  
Process Parameters ◽  
Surface Finish ◽  
Dimensional Accuracy ◽  
Depth Of Cut ◽  
Thin Wall ◽  
Micro Hardness ◽  
Wall Deflection ◽  
High Feed ◽  
Axial Depth

This article presents an experimental investigation into the influence of process parameters viz. feed per tooth, axial depth of cut on milling force, surface finish, wall deflection and micro-hardness during thin-wall machining of an aerospace grade aluminum alloy 2024-T351. Results revealed that the process parameters significantly influence the surface finish and dimensional accuracy of machined thin-walls. High feed rate promoted the formation of built-up-edge (BUE). Combination of high feed and axial depth of cut aided in catastrophic failure of tools. Surface damages such as material plucking, material shearing, material adhesion and deformed feed mark layer formation were observed. Axial depth of cut negatively influenced the wall deflection leading to loss of dimensional accuracy. Interestingly, the micro-hardness at the machined surface was found to be lower than that of the bulk material hardness. These results will be useful in selection of suitable process parameters for quality and precise machining of thin-wall parts.

Analysis on surface finish of thin-wall parts by laser metal deposition with annular beam

2019 ◽  
Vol 119 ◽  
pp. 105605 ◽  
Author(s):  
Jinchao Zhang ◽  
Shihong Shi ◽  
Geyan Fu ◽  
Jianjun Shi ◽  
Gangxian Zhu ◽  
...  
Keyword(s):  
Surface Finish ◽  
Metal Deposition ◽  
Thin Wall ◽  
Laser Metal Deposition ◽  
Annular Beam

Thin Wall Formed by Multi-Layer Overlapping Laser Cladding Forming

2014 ◽  
Vol 941-944 ◽  
pp. 2178-2181
Author(s):  
Feng Xiao Huang ◽  
Zhao Hai Yang ◽  
Da Wei Jin ◽  
Lin Jing Qin ◽  
Jin Gang Liu ◽  
...  
Keyword(s):  
Laser Beam ◽  
Laser Cladding ◽  
Surface Finish ◽  
Thin Wall ◽  
Laser Remelting ◽  
Forming Quality

Thin wall was formed by multi-layer overlapping laser cladding. The results showed that the surface of thin wall presents granular. Laser remelting could obviously improve the surface finish of the thin wall because of the melt of small granules. Match between the laser beam and the powder stream is very important and directly affects the forming quality. The microstructure of the thin wall presented obviously and continuously grown dendrite. Individual layers form metallurgic bonding and ensure whole properties of the cladding thin wall.

scholarly journals Transferability of the working envelope approach for parameter selection and optimization in thin wall WAAM

2021 ◽  
Author(s):  
Felipe Ribeiro Teixeira ◽  
Fernando Matos Scotti ◽  
Louriel Oliveira Vilarinho ◽  
Carlos Alberto Mendes da Mota ◽  
Américo Scotti
Keyword(s):  
Surface Finish ◽  
Steel Wire ◽  
Travel Speed ◽  
Parameter Selection ◽  
Basic Material ◽  
Feed Speed ◽  
Thin Wall ◽  
Wall Width ◽  
Thin Walls ◽  
Wire Feed Speed

AbstractThis work aims to propose and assess a methodology for parameterization for WAAM of thin walls based on a previously existing working envelope built for a basic material (parameter transferability). This work also aimed at investigating whether the working envelope approach can be used to optimize the parameterization for a target wall width in terms of arc energy (which governs microstructure and microhardness), surface finish and active deposition time. To reach the main objective, first, a reference working envelope was developed through a series of deposited walls with a plain C-Mn steel wire. Wire feed speed (WFS) and travel speed (TS) were treated as independent variables, while the geometric wall features were considered dependent variables. After validation, three combinations of WFS and TS capable of achieving the same effective wall width were deposited with a 2.25Cr-1Mo steel wire. To evaluate the parameter transferability between the two materials, the geometric features of these walls were measured and compared with the predicted values. The results showed minor deviations between the predicted and measured values. As a result, WAAM parameter selection for another material showed to be feasible after only fewer experiments (shorter time and lower resource consumption) from a working envelope previously developed. The usage of the approach to optimize parameterization was also demonstrated. For this case, lower values of WFS and TS were capable of achieving a better surface finish. However, higher WFS and TS are advantageous in terms of production time. As long as the same wall width is maintained, variations in WFS and TS do not significantly affect microstructure and microhardness.

Characterization of machined polystyrene foam

1989 ◽  
Vol 47 ◽  
pp. 372-373
Author(s):  
C. W. Price ◽  
E. F. Lindsey ◽  
R. M. Franks ◽  
M. A. Lane
Keyword(s):  
Surface Finish ◽  
Cell Walls ◽  
Surface Structures ◽  
Efficient Technique ◽  
Low Density ◽  
Polystyrene Foam ◽  
Planar Surfaces ◽  
Machining Characteristics

Diamond-point turning is an efficient technique for machining low-density polystyrene foam, and the surface finish can be substantially improved by grinding. However, both diamond-point turning and grinding tend to tear and fracture cell walls and leave asperities formed by agglomerations of fragmented cell walls. Vibratoming is proving to be an excellent technique to form planar surfaces in polystyrene, and the machining characteristics of vibratoming and diamond-point turning are compared.Our work has demonstrated that proper evaluation of surface structures in low density polystyrene foam requires stereoscopic examinations; tilts of + and − 3 1/2 degrees were used for the stereo pairs. Coating does not seriously distort low-density polystyrene foam. Therefore, the specimens were gold-palladium coated and examined in a Hitachi S-800 FESEM at 5 kV.

Effect of denture cleansers, surface finish, and temperature on Molloplast B resilient liner color, hardness, and texture

2000 ◽  
Vol 9 (3) ◽  
pp. 148-155 ◽  
Author(s):  
Han-Kuang Tan ◽  
Andrew Woo ◽  
Silvia Kim ◽  
Michael Lamoureux ◽  
Michael Grace
Keyword(s):  
Surface Finish ◽  
Denture Cleansers

Enhancement of Surface Finish of Boring Operation Using Passive Damper

2011 ◽  
Vol 2 (3) ◽  
pp. 68-70 ◽  
Author(s):  
Kanase Sandip S ◽  
◽  
Jadhav Vishvas S
Keyword(s):  
Surface Finish ◽  
Passive Damper
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