Numerical Simulation on Temperature Field of the Molten Pool under the Variable Duty Ratio Laser with the Inner Coaxial Powder Feeding

2011 ◽  
Vol 464 ◽  
pp. 405-408
Author(s):  
Gao Lian Shi ◽  
Shi Hong Shi ◽  
Shao Hua Wu ◽  
Yong Kang Wang
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Power Distribution ◽  
Molten Pool ◽  
High Speed ◽  
Duty Ratio ◽  
Transient Temperature ◽  
Outer Diameter ◽  
Transient Temperature Field ◽  
Powder Feeding

Aimed at the process of laser rapid prototyping with inner coaxial powder feeding, the finite element model on the transient temperature field of the molten pool is built and the transient temperature field of the molten pool under the laser with variable duty ratio is simulated numerically. The results show that the duty ratio of the laser affects the shape, dimension and power distribution of the molten pool. With the processing parameters: laser power (P)=3000W, outer diameter(d2)=4mm, scanning speed(V=5mm/s), the ideal value of ratio duty(K) is from 0.35 to 0.6. The shape of the molten pool is saddle shape or crescent. The position of the molten pool falls behind the center of the laser beam with the deviation to the both sides. Through shooting the molten pool with the high speed CCD camera, we find the experiments show that the images are close to the numerical simulation nephograms and then demonstrate that the numerical simulations are right.

scholarly journals Three-Dimensional Numerical Simulation of Transient Temperature Field and Coating Geometry in Powder Feeding Laser Cladding

2013 ◽  
Vol 40 (12) ◽  
pp. 1203007 ◽  
Author(s):  
刘昊 Liu Hao ◽  
虞钢 Yu Gang ◽  
何秀丽 He Xiuli ◽  
李少霞 Li Shaoxia ◽  
郑彩云 Zheng Caiyun ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Laser Cladding ◽  
Three Dimensional ◽  
Transient Temperature ◽  
Transient Temperature Field ◽  
Powder Feeding

Numerical Simulation of Three-Dimensional Molten Pool Temperature Field and Flow Field for Laser Melt Injection Based on Fluent

2012 ◽  
Vol 538-541 ◽  
pp. 1837-1842 ◽  
Author(s):  
Long Zhi Zhao ◽  
Zi Wang ◽  
Xin Yan Jiang ◽  
Jian Zhang ◽  
Ming Juan Zhao
Keyword(s):  
Temperature Field ◽  
Liquid Metal ◽  
Molten Pool ◽  
Metal Flow ◽  
Three Dimensional ◽  
Transient Temperature ◽  
Transient Temperature Field ◽  
Liquid Metal Flow ◽  
Fluent Software ◽  
Thermo Physical Properties

According to the characteristics of laser melt injection, a numerical model for a simplified 3D transient temperature field in molten pool was established using FLUENT software in this paper. In the model, many factors were considered such as liquid metal turbulence, latent heat of phase transformation and material thermo physical properties depending on temperature. The results show that the model can be developed well by FLUENT software. And the results also show that the driving force of the liquid metal flow mechanism.

scholarly journals Transient Temperature Field Model of Wear Land on the Flank of End Mills: A Focus on Time-Varying Heat Intensity and Time-Varying Heat Distribution Ratio

2019 ◽  
Vol 9 (8) ◽  
pp. 1698 ◽  
Author(s):  
Du ◽  
Yue ◽  
Liu ◽  
Liang ◽  
Wang ◽  
...  
Keyword(s):  
Temperature Field ◽  
High Speed ◽  
Field Model ◽  
Transient Temperature ◽  
Time Varying ◽  
Peripheral Milling ◽  
Transient Temperature Field ◽  
Proposed Model ◽  
Temperature Field Model ◽  
End Mills

Modelling methods for the transient temperature field of wear land on the flank of end mills have been proposed to address the challenges of inaccurate prediction in the temperature field of end mills during the high-speed peripheral milling of Ti6Al4V that is a titanium alloy. A transient temperature rise model of wear land on the flank of end mills was constructed under the influence of heat sources in the primary shearing zone (PSZ), rake-chip zone (RCZ), flank-workpiece zone (FWZ), and dissipating heat source. Then the transient temperature field model of wear land on the flank of end mills was constructed. Finally, the transient temperature field model of wear land on the flank of end mills was constructed. Comparison of simulation result and experimental data verified the accuracy of the model. In sum, the proposed model may provide a temperature model support for future studies of flank wear rate in end mill modeling.

scholarly journals Research on Model Slice and Forming Method of Thin-walled Parts

2021 ◽  
Vol 233 ◽  
pp. 04046
Author(s):  
Changhao Zhang ◽  
Hu Li ◽  
Jianyu Yang ◽  
Huawei Lu ◽  
Peng Su
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Structural Characteristics ◽  
Three Dimensional ◽  
Simulation Method ◽  
Processing Parameters ◽  
Transient Temperature ◽  
Transient Temperature Field ◽  
Thin Walled ◽  
Experimental Processing

According to the structural characteristics of thin-walled parts, a model slicing method is proposed, and its mathematical process is established. The three-dimensional transient temperature field in the process of synchronous powder feeding laser cladding is studied and verified by numerical simulation method, and the thin-walled parts formed by later experimental processing are processed by the results of numerical simulation. Using the simulation results of temperature field as the basis for optimizing the processing parameters, the forming path of thin-walled parts is programmed and optimized, and the experimental verification shows the reliability of this method.

Hump weld bead monitoring based on transient temperature field of molten pool

Optik ◽  
2020 ◽  
Vol 208 ◽  
pp. 164031 ◽  
Author(s):  
Jun Lu ◽  
Zhuang Zhao ◽  
Jing Han ◽  
Lianfa Bai
Keyword(s):  
Temperature Field ◽  
Molten Pool ◽  
Weld Bead ◽  
Transient Temperature ◽  
Transient Temperature Field
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