Bending Deformation of Pure Titanium Plate in CO2 Laser Forming

2007 ◽  
Vol 329 ◽  
pp. 625-630 ◽  
Author(s):  
Koichi Okuda ◽  
Y. Sugie ◽  
Masayuki Nunobiki
Keyword(s):  
Co2 Laser ◽  
Laser Power ◽  
Pure Titanium ◽  
Laser Spot ◽  
Laser Forming ◽  
Titanium Plate ◽  
Bending Angle ◽  
Spot Diameter ◽  
Bending Deformation ◽  
Laser Spot Diameter

This study deals with behaviour of bending deformation in CO2 laser forming process of titanium. CO2 laser forming technique was applied for a pure titanium plate with thickness of 1 mm to aim the development of new bending process. The experiments of laser forming were carried out with a CO2 laser machine. The bending angle and the temperature of workpiece were examined under the condition of various laser power, feed speed and laser spot diameter. Based on the experimental results, it was found that the bending deformation behaved greatly depending on the laser power and the laser spot diameter. The bending angle increased with an increase in the laser power. The bending direction tended to change from the laser irradiation side to its opposite side when the large laser spot diameter was applied.

Simulation of Drilling Micro-Hole by a Dual CO2 Laser Beam Irradiated Sticking Plaster

2012 ◽  
Vol 203 ◽  
pp. 519-522
Author(s):  
Zhi Ming Rao ◽  
Xian Bo Xiao ◽  
Zhi Fang He
Keyword(s):  
Laser Beam ◽  
Co2 Laser ◽  
Laser Power ◽  
Laser Spot ◽  
Beam Power ◽  
Analysis Software ◽  
Element Analysis ◽  
Spot Diameter ◽  
Micro Hole ◽  
Laser Spot Diameter

We explore a simulation model of drilling micro-hole in sticking plaster heated with a dual CO2 laser beam. This paper applied numerical simulation of temperature by using finite element analysis software Ansys to study a model of drilling on sticking plaster. A dual CO2 laser spot sizes ranged from 0.15 to 0.2mm radius with axial irradiance power levels of 50-100w. For temperatures above 450°C, sticking plaster would be vaporized. The size of ventilation holes changed with beam power and laser spot diameter. The width of the hole is increases with the increasing laser diameter and with the increasing laser power. These results can guide to laser drilling experiments.

scholarly journals In Situ Digital Image Correlation Observations of Laser Forming

Metals ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 17 ◽  
Author(s):  
Herman Fidder ◽  
Joris P. J. Admiraal ◽  
Václav Ocelík ◽  
Jeff Th. M. De Hosson
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Heat Affected Zone ◽  
Laser Power ◽  
Pure Titanium ◽  
Processing Parameters ◽  
Image Correlation ◽  
Laser Forming ◽  
Bending Angle

In this study experimental and modelling methods are used to examine the microstructural and bending responses of laser-formed commercially pure titanium grade 2. The in situ bending angle response is measured for different processing parameters utilizing 3D digital image correlation. The microstructural changes are observed using electron backscatter diffraction. Finite element modelling is used to analyse the heat transfer and temperature field inside the material. It has been proven that the laser bending process is not only controlled by processing parameters such as laser power and laser beam scanning speed, but also by surface absorption. Grain size appears to have no influence on the final bending angle, however, sandblasted samples showed a considerably higher final bending angle. Experimental and simulation results suggest that the laser power has a larger influence on the final bending angle than that of the laser transverse speed. The microstructure of the laser heat-affected zone consists of small refined grains at the top layer followed by large elongated grains. Deformation mechanisms such as slip and twinning were observed in the heat-affected zone, where their distribution depends on particular processing parameters.

scholarly journals Effect of Heat Treatment and Transformation on Bending Angle in Laser Forming of Titanium Foils

2007 ◽  
Vol 344 ◽  
pp. 243-250
Author(s):  
Masaaki Otsu ◽  
Yasuhiro Ito ◽  
Akira Ishii ◽  
Hideshi Miura ◽  
Kazuki Takashima
Keyword(s):  
Heat Treatment ◽  
Grain Size ◽  
Laser Power ◽  
Pure Titanium ◽  
Foil Thickness ◽  
Laser Forming ◽  
Bending Angle ◽  
History Of ◽  
Yvo4 Laser ◽  
Titanium Foils

Pure titanium foils were bent by laser forming and the effect of c-d transformation and history of heat treatment of specimen on bending angle was investigated. The thickness of specimens was changed from 40 to 100om, the length of them was 20mm and the width of them was 10mm. The specimens were annealed at 600-1100oC for 30 minutes in argon atmosphere. A 20W YVO4 laser was employed and laser power was changed from 2 to 16W. From the experimental results, when laser power was increased, bending angle also increased and it was dramatically changed at the laser powers occurring c-d transformation and melting. Bending angle increased as grain size increased and it jumped up when grain size exceeded the foil thickness and then became constant. Bending angle decreased by annealing after forming and degree of decrease was greater when the annealing temperature before forming was lower.

Simulation of Temperature and Stress Field of Titanium Alloys under Laser Cladding

2011 ◽  
Vol 301-303 ◽  
pp. 87-92 ◽  
Author(s):  
Zhi Ren ◽  
Yan Ling Tian ◽  
Ming Yue Zhou ◽  
Huan Ying Zheng ◽  
Shuai Zhang
Keyword(s):  
Titanium Alloy ◽  
Titanium Alloys ◽  
Laser Cladding ◽  
Negative Correlation ◽  
Laser Power ◽  
Laser Spot ◽  
Powder Layer ◽  
Spot Diameter ◽  
Tc4 Titanium Alloy ◽  
Laser Spot Diameter

Titanium alloys which exhibit excellent material properties like a high strength to weight ratio and good corrosion resistance have become the important structural materials in the applications of the aerospace. However, it’s quite difficult to repair the damages of the titanium alloy parts such as fatigue crack and erosion resulted from poor working environment using the traditional manufacturing technology while the problem can be easily solved with the help of laser cladding technology. For the excellent quality of the fixed parts, it is extraordinarily significant to obtain the rule of the temperature and thermal stress distribution in the cladding process. To investigate the influencing rule of cladding coating's temperature and stress on laser cladding process parameters, the model of laser cladding based on TC4 titanium alloy is built by the way of finite element method (FEM). This model encompasses the effects of the temperature-dependent thermal conduction and radiation as well as the latent heat of fusion. Different laser processing parameters are chosen to calculate the temperature and stress of cladding layer.The result shows that the temperature of the clad coating is positive correlation with the raise of laser power and the depth of the powder layer, and negative correlation with the raise of scanning speed and the laser spot diameter. In addition, the transient stress of clad coating is augmented with the increase of laser scanning velocity, laser spot diameter and the depth of the clad coating while it’s negative correlation with the raise of laser power. The numerical results provide the theoretical guidance for optimization of the laser cladding parameters on TC4 titanium alloy.

Analysis and comparison of semiconductor materials processed at IR vs. UV laser wavelengths for DRAM yield enhancement applications

2005 ◽  
Vol 890 ◽  
Author(s):  
Andy E. Hooper ◽  
Allen Kawasaki ◽  
Paul Kirby ◽  
Robert Hainsey ◽  
Jeongho Bang ◽  
...  
Keyword(s):  
Laser Energy ◽  
Yield Enhancement ◽  
Laser Spot ◽  
Semiconductor Layer ◽  
Semiconductor Materials ◽  
Uv Laser ◽  
Spot Diameter ◽  
Materials Used ◽  
Laser Spot Diameter

ABSTRACTThis report demonstrates the effects of IR and UV laser energy on common semiconductor layer stack materials used for DRAM laser fuses. By moving from IR to UV wavelengths it is possible to significantly shrink the laser spot diameter from ∼1.6 μm to 0.8 μm. Effects and concerns for the absorption of UV energy by Si, SiO2, nitrides, and oxynitrides are also presented.

Influence of Laser Spot Diameter on Cladding Layer Cracking

2015 ◽  
Vol 52 (3) ◽  
pp. 031401 ◽  
Author(s):  
付福兴 Fu Fuxing ◽  
畅庚榕 Chang Gengrong ◽  
赵小侠 Zhao Xiaoxia ◽  
张艳丽 Zhang Yanli
Keyword(s):  
Laser Spot ◽  
Spot Diameter ◽  
Cladding Layer ◽  
Laser Spot Diameter

Investigating the Effect of Process Parameters and Scan Strategy During Laser Forming of Thin Open Celled Aluminium Foam

2018 ◽  
Author(s):  
Mohammad Shahid Raza ◽  
Talari Srinu ◽  
Susmita Datta ◽  
Partha Saha
Keyword(s):  
Process Parameters ◽  
Laser Processing ◽  
Laser Power ◽  
Metal Foams ◽  
Parent Material ◽  
Aluminium Foam ◽  
Laser Forming ◽  
Micro Computed Tomography ◽  
Bending Angle ◽  
Scan Speed

The present study provides detailed investigation on the effect of various laser processing parameters and scan strategy during laser forming of thin open-celled aluminium foam. Previous research on laser bending showed that metal foams can be formed by laser processing, but it is very difficult to form the metal foams mechanically owing to their brittle nature. The 2D Laser forming operation was carried out using 2 kW fiber laser with laser power and scanning speed as input process parameters while bending angle was calculated as an output parameter. The effect of laser power, scan speed, number of scans and scan distance from the edge on bending angle of the foam were analyzed and presented. It was observed that the laser processing showed a decrease in bending angle with an increase in scan speed except for 1750 W power, where after 12500 mm/min the bending angle did not follow the trend. The bending angle decreased with increase in number of scans probably due to strain hardening effect. The effect of scan distance from the edge was different for lower process parameter combinations {600 W, 2500 mm/min} and {1000 W, 4000 mm/min}, where the bending angle was maximum for a distance of 20 mm from edge in 1400 W, 7500 mm/min scan speed. For 1750W, 11000 mm/min bending angle was maximum for 80 mm distance from edge. The SEM analysis showed that the major concern associated with laser forming of open-celled Aluminium foam is foam melting. EDS and XRD analysis showed that formation of different oxides and compounds of Aluminium increases with increases in laser power and scan speed. Micro-Computed Tomography (micro-CT) analysis confirmed the absence of crack during laser forming and the pore density variation during laser forming was clearly visible between laser processed zone and the parent material zone.

Microstructural Modification of Laser-Bent Open-Cell Aluminum Foams

2012 ◽  
Vol 504-506 ◽  
pp. 1213-1218 ◽  
Author(s):  
Loredana Santo ◽  
Denise Bellisario ◽  
Ludovica Rovatti ◽  
Fabrizio Quadrini
Keyword(s):  
Laser Heating ◽  
Laser Power ◽  
Laser Forming ◽  
Processing Conditions ◽  
Aluminum Foams ◽  
Laser Bending ◽  
Bending Angle ◽  
Open Cell ◽  
Scan Rate ◽  
Alloy Microstructure

Laser forming tests have been performed on open-cell aluminum alloy foams with different pore size. Laser power was fixed at 150 W, a total of 150 laser scans led to a bending angle up to 60°, depending on the laser scan rate. At the end of the laser bending, the foams were left to cool and samples were extracted for analysis by means of an optic microscope. The alloy microstructure was investigated in different points of the samples and correlated with the processing conditions. Image analysis was also carried out to extract the percentage of melted area due to laser heating.

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