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.

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

Numerical Simulation on Temperature Field in Multi-Layers Inside-Beam Powder Feeding when Laser Cladding

2012 ◽  
Vol 499 ◽  
pp. 114-119 ◽  
Author(s):  
Ming Di Wang ◽  
Shi Hong Shi ◽  
X.B. Liu ◽  
Cheng Fa Song ◽  
Li Ning Sun
Keyword(s):  
Numerical Simulation ◽  
Heat Source ◽  
Laser Beam ◽  
Cooling Rate ◽  
Light Source ◽  
Laser Cladding ◽  
Laser Scanning ◽  
Initial Conditions ◽  
Cladding Layer ◽  
Powder Feeding

Numerical simulation of laser cladding is the main research topics for many universities and academes, but all researchers used the Gaussian laser light source. Due to using inside-beam powder feeding for laser cladding, the laser is dispersed by the cone-shaped mirror, and then be focused by the annular mirror, the laser can be assumed as the light source of uniform intensity.In this paper,the temperature of powder during landing selected as the initial conditions, and adopting the life-and-death unit method, the moving point heat source and the uniform heat source are realized. In the thickness direction, using the small melt layer stacking method, a finite element model has been established, and layer unit is acted layer by layer, then a virtual reality laser cladding manu-facturing process is simulated. Calculated results show that the surface temperature of the cladding layer depends on the laser scanning speed, powder feed rate, defocus distance. As cladding layers increases, due to the heat conduction into the base too late, bath temperature will gradually increase. The highest temperature is not at the laser beam, but at the later point of the laser beam. In the clad-ding process, the temperature cooling rate of the cladding layer in high temperature section is great, and in the low-temperature, cooling rate is relatively small. These conclusions are also similar with the normal laser cladding. Finally, some experiments validate the simulation results. The trends of simulating temperature are fit to the actual temperature, and the temperature gradient can also ex-plain the actual shape of cross-section.

Realization and Research of Laser Cladding with Method of Internal Wire Feeding through a Hollow Laser Beam

2010 ◽  
Vol 37 (1) ◽  
pp. 266-270 ◽  
Author(s):  
石世宏 Shi Shihong ◽  
傅戈雁 Fu Geyan ◽  
李龙 Li Long ◽  
王永康 Wang Yongkang
Keyword(s):  
Laser Beam ◽  
Laser Cladding ◽  
Wire Feeding ◽  
Hollow Laser Beam

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.

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.

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