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Thermal effect of laser texturing process of finite element numerical simulation analysis

Author: LiangZuo
Tutor: ChenPeiFeng
School: Huazhong University of Science and Technology
Course: Physical Electronics
Keywords: Laser texturing Heat conduction Scanning Latent heat Natural Convection Marangoni convection Micromorphology
CLC: TN249
Type: Master's thesis
Year: 2009
Downloads: 39
Quote: 3
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Abstract


In recent years, with the automotive and home appliance industry, the rapid development of technology people use hair rolled deep drawing cold rolled steel sheet , coated performance increasing demand . However, there is one study on laser texturing is not very good , especially for laser texturing technology research there is real demand from the production of a great distance . Therefore , in order to further understand the mechanism of laser texturing , and then optimize the process parameters of laser texturing of theoretical study and numerical simulation is necessary . This thesis is to establish a theoretical model through a progressive approach and do the appropriate way of simulation analysis on the technical parameters of laser texturing and its impact on the effect of laser texturing has been studied . The main work of this paper are as follows: ( a ) from the laser-material interaction of heat conduction, convection , and vaporization melt quality and many other angles , elaborated on the mechanism of laser texturing , laser texturing established mathematical model . ( 2 ) does not consider the fluid flow in the basic assumptions , the establishment of the optical system of traditional wool thermal conduction model , and simulation research, reached the scanning mode can only get irregular oval pit texturing conclusions. ( 3 ) to improve the optical path , based on the model considering heat transfer during phase change latent heat , by finite element simulation demonstrates the latent heat effects ; draw laser power and beam radius , respectively, and the pool width and depth of approximately linearly between the maximum temperature bath approximate linear relationship with the power density of conclusions, and initially established the approximate range of processing parameters . ( 4 ) established to describe the laser texturing of computational fluid dynamics model , first without considering the free surface , only to do the simulation of natural convection , natural convection results have little effect on the molten pool micromorphology conclusions ; Then the melt surface quality tension gradient caused by the Marangoni convection is simulated , and track the free surface of the molten pool formation process , draw texturing pit micro morphology of intermediate depression, raised around the crater-like ; and come in the latter half of the laser pulse , Marangoni convection heat transfer over the role of the conclusions and further selected a range of processing parameters . This thesis on laser texturing machining practices have a guiding role .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Laser applications
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