Study on Technics in Laser Accumulation of Change-Diametral Rotary Parts with the Coaxial Inside-Beam Powder Feeding

2012 ◽  
Vol 510 ◽  
pp. 340-344
Author(s):  
Shi Hong Shi ◽  
Hong Yuan Li ◽  
Ge Yan Fu ◽  
Chen Wang ◽  
Hou Shun Sun
Keyword(s):  
Laser Beam ◽  
Laser Power ◽  
Novel Device ◽  
Forming Technology ◽  
Rotary Parts ◽  
Forming Characteristics ◽  
Bottom To Top ◽  
Hollow Laser Beam ◽  
Powder Feeding

Based on the forming technology of "hollow laser beam and internal powder, adopting a novel device with coaxial inside-beam and internal powder feeding, the accumulation experiments of the change-diametral rotary parts are carried out on the substrate of 45# steel. This study is focused on the control of the parts inclination angle, Z axis incremental and laser power on the forming characteristics of the parts. The results show that with the Coaxial Inside-beam Powder Feeding Accumulation, the quality of molding parts that this experiment gets finally is higher with smooth appearance and lower roughness. The grain is fine and the microstructure distribute uniformly from bottom to top of forming parts.

Influence of laser parameters and Ti content on the surface morphology of L-PBF fabricated Titania

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Abid Ullah ◽  
HengAn Wu ◽  
Asif Ur Rehman ◽  
YinBo Zhu ◽  
Tingting Liu ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Laser Beam ◽  
Surface Quality ◽  
Selective Oxidation ◽  
Laser Power ◽  
Scanning Speed ◽  
Content Type ◽  
Powder Bed ◽  
Laser Parameters

Purpose The purpose of this paper is to eliminate Part defects and enrich additive manufacturing of ceramics. Laser powder bed fusion (L-PBF) experiments were carried to investigate the effects of laser parameters and selective oxidation of Titanium (mixed with TiO2) on the microstructure, surface quality and melting state of Titania. The causes of several L-PBF parts defects were thoroughly analyzed. Design/methodology/approach Laser power and scanning speed were varied within a specific range (50–125 W and 170–200 mm/s, respectively). Furthermore, varying loads of Ti (1%, 3%, 5% and 15%) were mixed with TiO2, which was selectively oxidized with laser beam in the presence of oxygen environment. Findings Part defects such as cracks, pores and uneven grains growth were widely reduced in TiO2 L-PBF specimens. Increasing the laser power and decreasing the scanning speed shown significant improvements in the surface morphology of TiO2 ceramics. The amount of Ti material was fully melted and simultaneously changed into TiO2 by the application of the laser beam. The selective oxidation of Ti material also improved the melting condition, microstructure and surface quality of the specimens. Originality/value TiO2 ceramic specimens were produced through L-PBF process. Increasing the laser power and decreasing the scanning speed is an effective way to sufficiently melt the powders and reduce parts defects. Selective oxidation of Ti by a high power laser beam approach was used to improve the manufacturability of TiO2 specimens.

Laser Cladding Forming of Cantilevered Thin-Walled Part Based on Hollow-Laser Beam Inside Powder Feeding Technology2

2015 ◽  
Vol 42 (10) ◽  
pp. 1003003
Author(s):  
石拓 Shi Tuo ◽  
王伊卿 Wang Yiqing ◽  
卢秉恒 Lu Bingheng ◽  
石世宏 Shi Shihong ◽  
陆斌 Lu Bing ◽  
...  
Keyword(s):  
Laser Beam ◽  
Laser Cladding ◽  
Thin Walled ◽  
Hollow Laser Beam ◽  
Powder Feeding

Laser cladding forming of fan-shaped part based on hollow laser beam inside powder feeding technology

2017 ◽  
Vol 46 (9) ◽  
pp. 906007 ◽  
Author(s):  
周 斌 Zhou Bin ◽  
石世宏 Shi Shihong ◽  
邓志强 Deng Zhiqiang ◽  
石 拓 Shi Tuo ◽  
傅戈雁 Fu Geyan ◽  
...  
Keyword(s):  
Laser Beam ◽  
Laser Cladding ◽  
Shaped Part ◽  
Hollow Laser Beam ◽  
Feeding Technology ◽  
Powder Feeding

Temperature Field Numerical Simulation of Screwy Thin-Walled Part Cladded by Hollow Laser Beam

2013 ◽  
Vol 779-780 ◽  
pp. 410-413
Author(s):  
Hao Lin ◽  
Shi Hong Shi
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Laser Beam ◽  
Laser Cladding ◽  
Molten Pool ◽  
Laser Power ◽  
Forming Process ◽  
Single Laser ◽  
Thin Walled ◽  
Hollow Laser Beam

A numerical simulation model of laser cladding based on internal powder feeding through a hollow laser beam is set up by the Ansys Parametric Design Language (APDL). Through analyzing this model, the saddle-shaped distribution of energy absorbed in scanning direction is found and the molten pool temperature field of single laser cladding is observed like a comet[. Base on the single laser cladding experiments, the initial parameters and test plans of laser cladding and the screwy thin-walled part forming are confirmed. The finite element model of laser cladding forming screwy thin-walled part is established. The evolution of temperature field and thermal cycle of the nodes are studied during the screwy thin-walled part forming process. In the emulation laser power is controlled real time according to the analyses above, and the changing value of laser power is obtained to keep the molten pool temperature steady. The screwy thin-walled part is formed successfully based on these data.

Process Research of Laser Variable-Spot Overlap Cladding Based on Inside-Laser Coaxial Powder Feeding

2012 ◽  
Vol 566 ◽  
pp. 556-559
Author(s):  
Fei Cao ◽  
Shi Hong Shi ◽  
Ge Yan Fu ◽  
Yi Shao Zhang ◽  
Ji Li
Keyword(s):  
Laser Beam ◽  
Rapid Prototyping ◽  
Laser Cladding ◽  
Theoretical Basis ◽  
Process Research ◽  
Beam Power ◽  
Central Section ◽  
Novel Device ◽  
Step Effect ◽  
Hollow Laser Beam

Analyze the contradiction of laser cladding rapid prototyping between cladding efficiency and cladding precision, this paper advanced laser variable-spot cladding process with small facula outlining border of workpiece and big facula filling in central section of workpiece in order to improve the influence of “Step effect”. Based on the patent technology of “Hollow laser beam and internal power feeding”, the experiments of laser variable-spot overlap cladding are carried out on the substrate of 45# steel with a novel device of coaxial inside-beam power feeding. The experimental results were analyzed to provide a theoretical basis for the promotion and application of laser variable -spot overlap cladding.

Research on Melt-Path Forming Based on Internal Powder Feeding Through a Hollow Laser Beam

Applied laser ◽  
2013 ◽  
Vol 33 (4) ◽  
pp. 385-390
Author(s):  
石皋莲 Shi Gaolian ◽  
石世宏 Shi Shihong ◽  
王晨 Wang Chen
Keyword(s):  
Laser Beam ◽  
Hollow Laser Beam ◽  
Powder Feeding

Research on Melt-Path Forming Based on Internal Powder Feeding Through a Hollow Laser Beam

Applied laser ◽  
2013 ◽  
Vol 33 (4) ◽  
pp. 385-390
Author(s):  
石皋莲 Shi Gaolian ◽  
石世宏 Shi Shihong ◽  
王晨 Wang Chen
Keyword(s):  
Laser Beam ◽  
Hollow Laser Beam ◽  
Powder Feeding

Temperature Field Numerical Simulation of Laser Cladding Based on Internal Powder Feeding through a Hollow Laser Beam

2012 ◽  
Vol 39 (3) ◽  
pp. 0303002 ◽  
Author(s):  
石世宏 Shi Shihong ◽  
王晨 Wang Chen ◽  
徐爱琴 Xu Aiqin ◽  
孙后顺 Sun Houshun ◽  
李洪远 Li Hongyuan
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Laser Beam ◽  
Laser Cladding ◽  
Hollow Laser Beam ◽  
Powder Feeding
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