Experimental Investigation on Laser Milling of Al2O3 Ceramic

2013 ◽  
Vol 457-458 ◽  
pp. 160-163 ◽  
Author(s):  
Zhao Mei Xu ◽  
Zong Hai Hong
Keyword(s):  
Experimental Investigation ◽  
Laser Power ◽  
Orthogonal Experiment ◽  
Single Layer ◽  
Scanning Speed ◽  
Circular Cavity ◽  
Range Analysis ◽  
Factors Affecting ◽  
Milling Parameters ◽  
Laser Milling

Milling of Al2O3 ceramic is affected by various factors. Combination of laser milling parameters was optimized based on orthogonal experiment in this study. The affect degree of the parameters on the milling depth was obtained by range analysis ,based on which process parameters were optimized and laser milling experiment was taken on circular cavity using optimized parameters. The results indicated that the sequence of the factors affecting on the milling depth was laser power,scanning speed, overlap amount,defocused quantity successively. By using optimized parameters,milling depth of 0.4mm was obtained for single layer experiment,and milling result was satisfactory. The roughness was increased because the molten on the specimen surface failed to be removed,thus the pressure of the assist huff gas should be increased to improve the surface quality.

Indirect Selective Laser Sintering of 316L Powder and the Properties of the Parts

2015 ◽  
Vol 775 ◽  
pp. 209-213
Author(s):  
Nai Fei Ren ◽  
Ya Hui Hang ◽  
Yan Zhao ◽  
Qi Yu Yang
Keyword(s):  
Compressive Strength ◽  
Laser Power ◽  
Selective Laser Sintering ◽  
Influence Factors ◽  
Scanning Speed ◽  
Laser Sintering ◽  
Sintering Process ◽  
Range Analysis ◽  
Preheating Temperature ◽  
Molded Parts

During selective laser sintering process, different sintering parameters have great impact on the performance of the molded parts, and the degree of influence is different. Using orthogonal test, indirect sintered 316L stainless steel, the compressive strength and precision of the parts were measured and compared to study the influence of various sintering parameters (laser power, scanning speed, scan spacing, preheating temperature) on sintering. The greater degree of influence factors were got by range analysis. The results show that laser power, scanning speed and scan spacing have greater degree of influence on the compressive strength of the parts, and the preheating temperature have less impact. By comparison, the optimum set of parameters was concluded: the laser power is 15W, the scanning speed is 1900mm/s, the scan spacing is 0.125mm, and the preheating temperature is 60°C.

Effects of the Processing Parameters on the Forming Quality of Stainless Steel Parts by Selective Laser Melting

2011 ◽  
Vol 189-193 ◽  
pp. 3668-3671 ◽  
Author(s):  
Qing Song Wei ◽  
Xiao Zhao ◽  
Li Wang ◽  
Rui Di Li ◽  
Jie Liu ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Selective Laser Melting ◽  
Molten Pool ◽  
Laser Power ◽  
Single Layer ◽  
Scanning Speed ◽  
Processing Parameters ◽  
Powder Layer ◽  
Laser Melting

Selective Laser Melting (SLM) can produce high-performance metal parts with complex structures. However, it’s difficult to control the processing parameters, because many factors involves. From the perspective of the molten pool, the study focuses on the effects of processing parameters, including scanning speed, laser power, scanning space, layer thickness, and scanning strategies, on the surface quality, the balling effect, the density of SLM parts, by conducting experiments of single track, single layer and block forming. The results show that the quality of the molten pool is affected by laser power and scanning speed. Scanning drove in the strategy of “jumping and turning”，a smooth surface and a less balling effect will be obtained. The thicker the powder layer is, the lower density will be obtained. The optimal parameters from series of experiments are: laser power of 98W; scanning speed of 90mm/s; scanning space of 0.07mm; layer thickness of 0.1mm; and scanning strategy of “jumping and turning”.

Research of Artificial Neural Networks in the Al2O3 Ceramic Laser Milling Application

2014 ◽  
Vol 528 ◽  
pp. 101-106 ◽  
Author(s):  
Zhao Mei Xu ◽  
Zong Hai Hong ◽  
Gang Yang ◽  
Qin Gan Wang
Keyword(s):  
Laser Power ◽  
Scanning Speed ◽  
Milling Quality ◽  
Laser Process ◽  
Laser Milling ◽  
The Mean ◽  
Ceramic Laser ◽  
Artificial Neural ◽  
Artificial Neural Network Ann

Based on the artificial neural network (ANN), a model is established to describe the relation of the laser milling quality of the Al2O3ceramics with the ceramics parameters. The milling quality of Al2O3ceramics are predicted with the model in which the input parameters consist of laser power, scanning speed and defocus amount and the output parameters include the milling depth and width. The results show that the mean error is small, and the model has good verifying precision and excellent ability of predicting. The laser process parameters can be chosen easily and accurately to improve the processing quality of laser milling.

Experimental Study on Freeze Thaw Resistance Concrete

2013 ◽  
Vol 830 ◽  
pp. 41-44
Author(s):  
Fu Yun Yang
Keyword(s):  
Experimental Study ◽  
Frost Resistance ◽  
Orthogonal Experiment ◽  
Research Experience ◽  
Range Analysis ◽  
Mixture Ratio ◽  
Factors Affecting ◽  
Freeze Thaw ◽  
Durability Of Concrete

In this paper, through the domestic and foreign research experience, the orthogonal experiment on some factors affecting the durability of concrete is designed. By range analysis the tests identify the effects of various factors on frost resistance, therefore this paper presents the optimum mixture ratio.

scholarly journals An Analytical and Experimental Investigation of Average Laser Power and Angular Scanning Speed Effects on Laser Tube Bending Process

2017 ◽  
Vol 95 ◽  
pp. 05008 ◽  
Author(s):  
Khalil Ibraheem Imhan ◽  
B.T.H.T. Baharudin ◽  
Azmi Zakaria ◽  
Mohd Idris Shah b. Ismail ◽  
Nasser Mahdi Hadi Alsabti ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Laser Power ◽  
Scanning Speed ◽  
Tube Bending ◽  
Laser Tube ◽  
Average Laser Power ◽  
Bending Process ◽  
Angular Scanning ◽  
Average Laser

scholarly journals The Influence of Selective Laser Melting Process Parameters on the Property of TiAlN/TiN Multilayer Coating on the 316L Steel

Coatings ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 377 ◽  
Author(s):  
Yueling Lyu ◽  
Jingwei Wang ◽  
Yulin Wan ◽  
Yangzhi Chen
Keyword(s):  
Selective Laser Melting ◽  
Process Parameters ◽  
Laser Power ◽  
Orthogonal Experiment ◽  
Multilayer Coating ◽  
Melting Process ◽  
Scanning Speed ◽  
Laser Melting ◽  
Wear Rates ◽  
Comprehensive Property

Selective laser melting (SLM) is an important advanced additive manufacturing technology. The existing SLM products cannot fully meet the requirements of high-precision and strength of the mechanical component because of their defects. The TiAlN/TiN multilayer coating can improve the surface property of SLM products. The present work aims to explore the influences of different process parameters of SLM on the property of TiAlN/TiN multilayer coating plating on the 361L specimen and the mechanism of these influences. Taking laser power, scanning speed, and scanning space as factors, an orthogonal experiment was designed. The TiAlN/TiN multilayer coating specimens can be obtained by plating on the 361L specimen, fabricated by the process parameters of SLM on the orthogonal experiment. The surface topographies and properties of TiAlN/TiN multilayer coating were tested, the influences of SLM process parameters on TiAlN/TiN multilayer coating were analyzed, and the optimal process parameter was obtained. The electron microscope images revealed that the surface morphology of TiAlN/TiN multilayer coating plating on the SLM specimen was relatively flat, and there were some macro-particles in different sizes and pin holes dispersed on it. The thickness of the TiAlN/TiN multilayer coating was 2.77–3.29 μm. The microhardness value of coating SLM specimen was more than four times that of the uncoated SLM specimen and the wear rates of the uncoated specimen were 2–4 times that of the corresponding coating specimen. The comprehensive analysis shows that the laser power had the greatest influence on the comprehensive property of the coating. The primary cause of the influence of SLM process parameters on the properties of the TiAlN/TiN multilayer coating was preliminarily discussed. When the laser power was 170 W, the scanning speed was 1,100 mm/s, and the scanning space was 0.08mm, the TiAlN/TiN multilayer coating plating on the SLM specimen had the best comprehensive property.

Research on Milling Deformation in Ultrasonic Vibration Assisted End Milling of Titanium Alloy Thin-Walled Parts

2018 ◽  
Vol 764 ◽  
pp. 174-183
Author(s):  
Feng Jiao ◽  
Li Zhao ◽  
Cheng Lin Yao ◽  
Feng Qi
Keyword(s):  
Titanium Alloy ◽  
Ultrasonic Vibration ◽  
End Milling ◽  
Orthogonal Experiment ◽  
Machining Accuracy ◽  
Thin Wall ◽  
Range Analysis ◽  
Milling Parameters ◽  
Alloy Material ◽  
Thin Walled

The hard machinability of titanium alloy material and the poor stiffness of thin-walled parts hindered the extensive application of titanium alloy thin-walled components in aerospace engineering. In order to heighten the geometric accuracy in the processing, the ultrasonic vibration assisted (UVA) end milling technology with workpiece vibrating in feed direction was put forward in this paper, and characteristics of the milling deformation in UVA milling of titanium alloy TC4 thin-walled workpieces were researched. Through the theoretical analysis, the cutting force and deformation characteristics in UVA milling were clarified. Based on the range analysis of orthogonal experiment, the effects of milling parameters and ultrasonic amplitude on the deflection displacement and the milling deformation of workpieces are obtained. Research results show that the deflection displacement in the process of UVA milling affects the thickness error of the thin wall. Ultrasonic parameters as well as milling parameters should be optimized to obtain higher machining accuracy. The research provides a certain reference for the precision milling of titanium alloy thin-walled parts.

scholarly journals Experimental Study on Factors Affecting Interlayer Shear Strength of Fiber Seal

2012 ◽  
Vol 5 ◽  
pp. 253-258
Author(s):  
Peng Cao ◽  
De Cheng Feng ◽  
Chun Wei Gong ◽  
Yin Zhao
Keyword(s):  
Shear Strength ◽  
Orthogonal Experiment ◽  
Influencing Factor ◽  
Fiber Content ◽  
Range Analysis ◽  
Factors Affecting ◽  
Interlayer Shear ◽  
And Performance ◽  
Interlayer Shear Strength ◽  
Selection Of

In order to study influence of different factors on interlayer shear strength of fiber seal, an orthogonal experiment about four factors, respectively, test temperature, fiber content, asphalt content and gravel coverage, and three levels are developed with bevel shear test. The influence rules are evaluated by range analysis method. The result demonstrated that fiber content is the most correlative influencing factor. Thus provides a basis for the selection of material and performance of the fiber seal.

Experimental Study on Sintering Parameters in Selective Laser Sintering for ABS

2011 ◽  
Vol 314-316 ◽  
pp. 738-741 ◽  
Author(s):  
Qing Guo Chen ◽  
Jun Cai Zhang
Keyword(s):  
Laser Power ◽  
Sintering Temperature ◽  
Laser Energy ◽  
Selective Laser Sintering ◽  
Single Layer ◽  
Scanning Speed ◽  
Laser Sintering ◽  
Orthogonal Experimental Design ◽  
Preheat Temperature ◽  
Abs Resin

Sintering temperature influences on sintering process essentially. Laser power and scanning speed determined sintering temperature. Preheat to powder is beneficial to improve the surface temperature uniformity. Stress concentration of part is various in different layer depth. Therefore, the influence of laser power, scanning speed, thickness of spreading layer and preheat temperature on part quality in selective laser sintering(SLS) are main factors. Based on laser energy in Gaussian distribution and mechanism of SLS, with manufactured specimen pieces by molding machine AFS-450, orthogonal experimental design and analysis of variance are adopted to post-treatment. The prototyping sintering parameters are optimized. The result and solution of the experiment are the preheat temperature of 100°C, the scanning speed of 2000 mm/s, the laser power of 24W, the thickness of single layer of 0.2mm for ABS resin. This work can provide optimized parameters in SLS for ABS resin. It will be of benefit to improve the part dimensional precision and strength.

Analysis on Slope Stability Based on Factor Sensitivity

2013 ◽  
Vol 475-476 ◽  
pp. 1528-1533
Author(s):  
Liang Cao ◽  
Shan Guang Qian ◽  
Hui Min Wang ◽  
Jian Feng Huang
Keyword(s):  
Stability Analysis ◽  
Slope Stability ◽  
Orthogonal Experiment ◽  
Limit Equilibrium ◽  
Limit Equilibrium Method ◽  
Mechanical Parameters ◽  
Analysis Method ◽  
Key Factors ◽  
Range Analysis ◽  
Factors Affecting

A slope model was established in this paper, the accuracy of simplified Bishop Method based on rigid body limit equilibrium method was verified. The orthogonal experiment for structure was made aimed at the main mechanical parameters of rock material, and then simplified Bishop Method was used to analyze the slope stability. Using range analysis method and variance analysis method to analyze various factors affecting slope stability, then the key factors for slope stability were obtained. The focus of geotechnical engineering considerations was pointed out, and provided reference for more accurate slope stability analysis.

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