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      저자 : Basem Abdo (검색결과 2 건)
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        Laser beam machining of zirconia ceramic: An investigation of micro-machining geometry and surface roughness

        Basem M. A. Abdo,Naveed Ahmed,Abdulaziz M. El-Tamimi,Saqib Anwar,Hisham Alkhalefah,Emad Abouel Nasr 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.4

        Micro-machining of dental ceramics namely as zirconium oxide is carried out through laser beam machining. Micro-channels of different sizes are fabricated under different laser parameters. The laser process performance is evaluated by considering the geometrical and quality responses associated with micro-channels. Laser intensity, pulse frequency, scanning speed and layer thickness per laser scan are opted as the influential controlling parameters. Geometrical characteristics of micro-channels include upper width (W U ), lower width (W L ), depth (D), taper angle of micro-channel’s sidewalls at right side ( q R ), and taper angle at left side ( q L ). Quality of the machined micro-channels is evaluated by means of surface roughness (R a ) of the bottom surface. Effects of each of the laser parameters on each of the geometrical and quality responses are studied in order to get the influential trends of laser parameters. SEM analysis is further performed to assess the micro-details of machining results. The results reveals that the shape and size of micro-channel are very sensitive to the variation in laser parameters. Two types of micro-channels shapes are obtained having V-shaped and U-shaped cross-sections. Furthermore, it is quite challenging to achieve the micro-channels with reasonable amount of lower width (W L ).

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        Predicting surface quality of γ-TiAl produced by additive manufacturing process using response surface method

        Abdulrahman Al-Ahmari,Mohammad Ashfaq,Abdullah Alfaify,Basem Abdo,Abdulrahman Alomar,Abdelnaser Dawud 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.1

        Electron beam melting (EBM) has been found to be a promising technology for producing complex shaped parts from gamma titaniumaluminide alloys (γ-TiAl). The parts produced by this process are projected to have dimensions very close to the desired final shapes. However, the surface roughness of the parts produced by EBM is excessively rough. In many applications, it is necessary to improve thequality of manufactured parts using a convenient post process. This paper determines process parameters of end milling when it is usedas a post process for the parts produced by EBM. Design of experiments has been used to study the effect of the selected input parametersof end milling (spindle speed, feed rate, depth of cut and coolant type) on the surface roughness of γ-TiAl parts. Response surface methodologyis used to develop a predictive model for surface roughness. Effects of the selected milling process are investigated. This paperalso optimizes the selected process parameters to minimize the value of the obtained surface roughness.

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