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- 저자 : Songmene (검색결과 4 건)
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Elgnemi, Tarek,Ahmadi, Keivan,Songmene, Victor,Nam, Jungsoo,Jun, Martin B.G. Elsevier 2017 Journal of manufacturing processes Vol.30 No.-
<P><B>Abstract</B></P> <P>Carbon Fiber Reinforced Polymers (CFRP) are considered hard to cut materials, because of the abrasiveness of carbon fibers and the low transverse strength of the composite layers that leads to delimitation under machining forces. The application of cutting fluid is a common way of reducing tool wear and machining forces in machining of metallic materials, yet this solution cannot be applied in machining of CFRP, because moisture damages the structural integrity of the composite workpiece. In this paper, an experimental study is conducted to examine the feasibility and effectiveness of applying atomized cutting fluid in milling of CFRP. In the studied atomization-based method, the cutting fluid is broken down into micrometer size droplets that are sprayed directly into the cutting zone. In the presented study, two types of cutting fluids, general purpose semisynthetic coolant and vegetable oil, are applied by atomization, and their performances in reducing cutting forces, tool wear, surface roughness, and delamination are studied over a range of cutting speeds and feed rate values.</P>
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Evaluation of Machined Part Surface Roughness using Image Texture Gradient Factor
Rene Kamguem,Victor Songmene,Souheil Antoine Tahan 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
In mechanical manufacturing, the state of a machined part surface is very crucial, particularly in aeronautics, and as a result, great care must be exercised in its measurement. Over the past few years, many research studies have been carried out to mitigate the disadvantages (contact, off-line inspection, speed of limited measurement) inherent in the classic measurement of the roughness by contact with a stylus. The contribution of this paper is to demonstrate the feasibility of the contactless inspection of part surface roughness using an optical microscope. Unlike most works in the domain that use image average of grey level and the average cycle of the texture, a new image characteristic named the gradient factor of the image is defined and used to estimate the part roughness parameters. The effect of the vision system parameters on image quality is investigated then the statistical characteristics of the images best describing the machined surface are determined and used to estimate the roughness parameters. The study shows that several roughness parameters (Ra, Rq, Rv, Rt and Rz) can be estimated using only image-extracted features and models, without the need to know the machining parameters used to generate the surface. The results obtained with the vision system are comparable to those obtained with a stylus contact surface roughness measurement system, and could help in the online monitoring of the surface roughness.
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Simultaneous optimization of burrs size and surface finish when milling 6061-T6 aluminium alloy
Seyed Ali Niknam1,Victor Songmene 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
Abstract- Taguchi-based optimization has been successfully applied in industrial applications. Some of these applications have more than one response to study. Most of reported applications of Taguchi method deal with single objective optimization, while multiple responses optimization has received relatively less attentions. The main objective of this article is to propose new modifications to application of Taguchi method by proposing fitness mapping function (ψ) and Desirability index (Di) for correct selection of process parameters setting levels that can be used for multiple responses optimization. The proposed method is verified by simultaneous minimization of surface roughness and burrs thickness during slot milling of 6061-T6aluminium alloy. It was found that surface roughness and burrs size can be optimized by selecting appropriate setting levels of process parameters. According to experimental results, feed per tooth has the major influence on variation of burr size and surface roughness, while cutting speed has shown less significant effect as compared to other cutting parameters used.
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Hamid Javadi,Walid Jomaa,Victor Songmene,Myriam Brochu,Philippe Bocher 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.8
An original approach is introduced to discriminate the effects of residual stress and surface roughness on turned Inconel 718 alloy parts. This could be used for assessing or studying the performance of these specimens during fatigue tests. This method consists of building surface integrity maps in terms of surface roughness parameters and residual stress in order to select specific turning conditions with adequate machining parameters. The surface integrity maps were generated by using response surface methodology based empirical models and precision turning tests on coupons. The proposed approach was therefore successfully applied to manufacture rotating bending fatigue specimens with the surface axial residual stress varying from − 239 to 446 MPa while keeping the arithmetic average roughness and the surface hoop residual stress constant. The effect of the surface axial residual stress on the fatigue life could thus be discriminated from the other surface integrity characteristics effects. The proposed methodology is independent of the manufacturing process and can be extended to other machining processes such as milling, grinding, and broaching.
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