Experimental Investigation on the Process of Jet Electrochemical Machining and Guided Laser Beam Machining

2010 ◽  
Vol 458 ◽  
pp. 325-330
Author(s):  
Li Xin Yuan ◽  
Jia Wen Xu ◽  
Jian She Zhao
Keyword(s):  
Laser Beam ◽  
Electrochemical Machining ◽  
Engineering Application ◽  
Recast Layer ◽  
Experimental Results ◽  
Laser Beam Machining ◽  
Metallurgical Defects ◽  
Jet Electrochemical Machining ◽  
Better Than

Laser beam machining is often associated with the metallurgical defects related with spatter, recast layer and heat-affected zone. In order to overcome the defects, this paper presents a process of jet electrochemical machining and guided laser beam machining (JECM-GLBM). On the explain of experimental principle and apparatus, jet electrochemical machining and laser beam machining(JECM-LBM) and JECM-GLBM experiments have been performed on 0.5mm thick 321S20 stainless steel under the same experimental condition respectively. The experimental results show that the entry circularity, repeatability and the surface quality of JECM-GLBM are significantly better than JECM-LBM, and the spatter and the recast layer of hole-wall has been mostly removed in JECM-GLBM. In addition, increasing the IEG leads that the taper and overcut are decreased in JECM-GLBM. By analyzing the experimental results, the best IEG is 10mm, which is unusually beneficial for the design of equipment in engineering application.

Research on Hybrid Process of Laser Drilling With Jet Electrochemical Machining

2012 ◽  
Vol 134 (6) ◽  
Author(s):  
Lixin Yuan ◽  
Jiawen Xu ◽  
Jianshe Zhao ◽  
Hua Zhang
Keyword(s):  
Electrochemical Machining ◽  
Laser Drilling ◽  
Electrochemical Process ◽  
Recast Layer ◽  
Hybrid Process ◽  
Electrochemical Dissolution ◽  
Proper Distance ◽  
Metallurgical Defects ◽  
Jet Electrochemical Machining ◽  
Electrolyte Jet

The spatter and recast layer are main metallurgical defects in laser drilling (LD). Combining jet electrochemical process with laser can minimize such defects. The hybrid process is called electrolysis jet guided laser drilling (EJGLD). The presented experiment results show that the electrolyte jet can guide and transmit laser to the workpiece for drilling; and the electrochemical dissolution can effectively reduce spatter and recast layer. This paper introduces work on how to optimize this hybrid process, in particular, how to set a proper distance between the cathode and workpiece for best efficiency and accuracy.

Green Laser Drilling Assisted with Jet Electrochemical Machining of Nickel-Based Superalloy

2010 ◽  
Vol 426-427 ◽  
pp. 75-80 ◽  
Author(s):  
H. Zhang ◽  
Jia Wen Xu ◽  
J.M. Wang
Keyword(s):  
Electrochemical Machining ◽  
Frequency Doubling ◽  
Optical Microscope ◽  
Green Laser ◽  
Laser Drilling ◽  
Recast Layer ◽  
Ambient Atmosphere ◽  
Nickel Based Superalloy ◽  
Experimental Apparatus ◽  
Jet Electrochemical Machining

Laser drilling is extensively used in the aerospace and aircraft industries. The most important application is the drilling of fine cooling holes in aero turbine engine components such as nozzle guide vanes and blades. However, laser-drilled holes are typically associated with a number of inherent defects such as recast layer and spatter. In order to solve these problems, a novel hybrid process of laser drilling assisted with jet electrochemical machining (JECM-LD) has been developed to improve the overall quality of laser-drilled holes. The process based on the application of a jet electrolyte, being aligned coaxially with the focused laser beam, on the workpiece surface. The effects of the jet electrolyte during the process mostly consist of electro chemical reaction, effective cooling with materials and transporting debris. A pulsed Nd:YAG laser with frequency doubling is used in the JECM-LD experiments. On the basis of a measurement of laser attenuation in electrolyte, an experimental apparatus system is built and JECM-LD experiments are performed on 0.5mm thickness nickel-based superalloy sheets with the system. The optical microscope is used to detect the experimental results. It is found that the recast layer and spatter have been effectively removed during the JECM-LD compared with laser drilling in ambient atmosphere conditions. The efficiency of JECM-LD with millisecond green laser is about 70% of laser drilling in air.

Developments in nonconventional machining for sustainable production: A state-of-the-art review

2018 ◽  
Vol 233 (12) ◽  
pp. 4213-4232 ◽  
Author(s):  
Kapil Gupta ◽  
Munish Kumar Gupta
Keyword(s):  
Laser Beam ◽  
Electric Discharge ◽  
State Of The Art ◽  
Electrochemical Machining ◽  
Health And Safety ◽  
Future Research ◽  
Machining Processes ◽  
Electric Discharge Machining ◽  
Laser Beam Machining ◽  
Sustainability Challenges

Nonconventional or advanced machining processes such as electric discharge machining, electrochemical machining, abrasive water jet machining, and laser beam machining have been widely used as a viable alternate to the conventional processes to manufacture high-quality engineered parts having certain typical features. In spite of their special features, wider acceptance, and use, they suffer from certain inherent limitations with regard to sustainability such as high consumption of energy and resources; generation of toxic liquid, gases, and solid wastes; risk for health and safety; air pollution; generation of waste and its disposal problems; and workpiece contamination and thermal damage to the parts being produced. It is found that these factors all adversely affect the environment to a certain extent. Innovative sustainable techniques such as dry, near-dry, and green electric discharge machining; green and hybrid electrochemical machining; ice-jet machining; and eco- and underwater laser beam machining, etc. have been developed to address sustainability challenges and greatly benefited with improvements in quality, productivity, and sustainability. This review article first introduces four major nonconventional machining processes, discusses their inherent sustainability issues and challenges, and presents state-of-the-art review of the work conducted using sustainable innovative techniques and strategies with an aim to encourage academics, researchers, and engineers for research and developments in order to establish the field further. The literature review offered in this article is based on over 80 articles published from 1975 to 2017. Finally, the article ends up with concluding remarks and recommending possible avenues to stimulate future research.

Effect of high-frequency orbital and vertical oscillations of the laser focus position on the quality of the cut surface in a thick plate by laser beam machining

2015 ◽  
Vol 40 ◽  
pp. 112-123 ◽  
Author(s):  
Yoshihiro Morimoto ◽  
Dongjue He ◽  
Wataru Hijikata ◽  
Tadahiko Shinshi ◽  
Takahiro Nakai ◽  
...  
Keyword(s):  
Laser Beam ◽  
High Frequency ◽  
Thick Plate ◽  
Focus Position ◽  
Laser Beam Machining ◽  
Laser Focus ◽  
Cut Surface

Novel Compact Genetic Algorithm for WTA Problem

2012 ◽  
Vol 239-240 ◽  
pp. 1437-1441 ◽  
Author(s):  
Zhen Liu ◽  
Yun An Hu
Keyword(s):  
Genetic Algorithm ◽  
Experimental Results ◽  
The Novel ◽  
Simple Genetic Algorithm ◽  
Exchange Information ◽  
Compact Genetic Algorithm ◽  
Two Populations ◽  
Novel Algorithm ◽  
Better Than

The paper proposed a novel compact genetic algorithm which is named as pseudo-parallel compact genetic algorithm. There are two populations in the process of evolution, and the two subpopulation can exchange information between each other. The experimental results show that the novel algorithm performs better than simple genetic algorithm. Then it is used to solve weapon target allocation (WTA) problem, and the simulation result shows that it is more efficient comparing with other methods. Because the compact genetic algorithm is easy to operate and take up less memory, so the algorithm exhibit a better quality of solution and the required less time than before.

Grid-Based Task Scheduling PMTS Algorithm

2011 ◽  
Vol 121-126 ◽  
pp. 4491-4497 ◽  
Author(s):  
Jian Lin Qiu ◽  
Li Chen ◽  
Jian Ping Chen ◽  
Xiang Gu ◽  
Yan Yun Chen
Keyword(s):  
Quality Of Service ◽  
Task Scheduling ◽  
Load Balance ◽  
Time Span ◽  
Experimental Results ◽  
Economic Principle ◽  
Comprehensive Performance ◽  
Grid Based ◽  
Better Than

This paper analyses the Min-min algorithm and its improved algorithms through the performances of load balance, time span, quality of service and economic principle. Based on the analysis of the merits of these algorithms, we propose an improved algorithm as PMTS (Priority-based maximum time-span algorithm) by integrating. In the instance of the application, we analyse and compare the performances of these algorithms, and experimental results show that, PMTS algorithm is better than other algorithms in the comprehensive performance of load-balance, time-span, quality of service and other aspects.

Depth from Defocus Using Geometric Optics Regularization

2013 ◽  
Vol 709 ◽  
pp. 511-514 ◽  
Author(s):  
Qiu Feng Wu ◽  
Kuan Quan Wang ◽  
Wang Meng Zuo
Keyword(s):  
Relative Position ◽  
Image Plane ◽  
Experimental Results ◽  
Depth Information ◽  
Geometric Optics ◽  
Regularization Term ◽  
Information Divergence ◽  
Depth From Defocus ◽  
Better Than

This paper formulates the problem of recovering depth information of the scene from two defocused images as the minimization of the information divergence between the two measured defocused images based on geometric optics regularization. This geometric optics regularization term is attained according to different relative position of image plane and image focus. The experimental results show that the quality of the estimated depth is significantly better than that obtained without the geometric optics regularization.

Effects of Different Structure Rotors on Mixing Process and Quality of Short Fiber-Rubber Composite Material

2009 ◽  
Vol 87-88 ◽  
pp. 277-281
Author(s):  
Chuan Sheng Wang ◽  
De Wei Zhang ◽  
Hui Guang Bian
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Short Fiber ◽  
Experimental Results ◽  
Mixing Process ◽  
Mixing Performance ◽  
Rubber Composite ◽  
New Type ◽  
Better Than

The structure of rotors is an important factor, which impacts the quality of the mixed rubber. For the short fiber-rubber composite material, the structure of the rotors is most important. Through the experiments study, the mixing performances of four-wing synchronous rotor, six-wing synchronous rotor and new type of six-wing synchronous varying clearance rotor have been studied. The experimental results indicated that the mixing performance of the new type rotor is much better than the four-wing and six-wing synchronous rotor for the mixing of short fiber-rubber composite materials.

The Effect of Electromagnetic Stirring on Steel Strand Quality

2012 ◽  
Vol 482-484 ◽  
pp. 1699-1702
Author(s):  
Chun Liu ◽  
Bai Gang Jin
Keyword(s):  
Carbon Steel ◽  
High Carbon Steel ◽  
Experimental Results ◽  
Electromagnetic Stirring ◽  
Current Intensity ◽  
High Carbon ◽  
Equiaxed Zone ◽  
Steel Strand ◽  
Better Than

Application experiments have been done to research the strand quality of high carbon steel 65Mn under the condition of electromagnetic stirring. The experimental results show that the effect of electromagnetic stirring with stirring rollers in side-side disposition mode is better than that in face-face disposition mode. The effect of electromagnetic stirring is also increased with the increasing of current intensity, and the continuous stirring is better than alternating stirring. Thus, conclusion could be arrived that the strand inner quality is improved obviously by the adoption of electromagnetic stirring due to 32% increase of equiaxed zone ratio in the strand and the decrease from B0.5 to C1.0 of the center segregation grade.

Slot Grinding of Advanced Ceramics with Brazed Diamond Cut-Off Wheels

2011 ◽  
Vol 175 ◽  
pp. 52-57
Author(s):  
Mei Chen ◽  
Feng Zhang ◽  
Jian Yun Shen ◽  
Hua Guo ◽  
Xi Peng Xu
Keyword(s):  
Surface Roughness ◽  
Silicon Nitride ◽  
Experimental Results ◽  
Advanced Ceramics ◽  
Abrasive Resistance ◽  
Wear Process ◽  
Grinding Ratio ◽  
Better Than

Based on the analysis of problems of diamond cut-off wheels used in slot grinding of ceramics at present, a brazed diamond cut-off wheel was produced and analyzed. Two typical advanced ceramics, alumina and silicon nitride, were used as the workpiece materials. In the experiments of slot grinding of ceramics, grinding ratio, wear process of the wheel and grinding quality of the work were studied. Experimental results showed that the brazed diamond cut-off wheel obtained good grinding ratio and abrasive resistance. The surface roughness of ground silicon nitride was better than that of alumina.

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