... My greatest thanks are reserved for my wife, Soaad El-Hofy, and my daughters Noha, Assmaa, an... more ... My greatest thanks are reserved for my wife, Soaad El-Hofy, and my daughters Noha, Assmaa, and Lina for their patience, support, and encour-agement during the preparation of the ... I would like to specifically acknowledge the help of I. Shyha, M. Hossam, and N. El-Breshy. ...
The machining of hard-to-cut materials with a high degree of precision and high surface quality i... more The machining of hard-to-cut materials with a high degree of precision and high surface quality is one of the most critical considerations when fabricating various state-of-the-art engineered components. In this investigation, a comprehensive three-dimensional model was developed and numerically simulated to predict kerf profiles and material removal rates while drilling the aluminum-7075-T6 aerospace alloy. Kerf profile and material removal prediction involved three stages: jet dynamic flow modeling, abrasive particle tracking, and erosion rate prediction . Experimental investigations were conducted to validate the developed model. The results indicate that the jet dynamic characteristics and flow of abrasive particles alter the kerf profiles, where the top kerf diameter increases with increasing jet pressure and standoff distance. The kerf depth and hole aspect ratio increase with jet pressure, but decrease with standoff distance and machining time. Cross-sectional profiles were characterized by progressive edge rounding and parabolic shapes. Defects can be minimized by utilizing high jet pressure and small standoff distance. The material removal rate increases with increasing jet pressure, abrasive particle size, and exposure time, but decreases with increasing standoff distance.
International Journal of Machining and Machinability of Materials, 2021
Recently, an ultrasonic vibration-assisted technique has been utilised to improve the hole-making... more Recently, an ultrasonic vibration-assisted technique has been utilised to improve the hole-making process of aerospace materials. However, there was a lack in discussing the effect of applying ultr...
Ultrasonic-assisted drilling (UAD) is a new process used for producing holes in the hard-to-cut a... more Ultrasonic-assisted drilling (UAD) is a new process used for producing holes in the hard-to-cut and brittle materials at high accuracy and surface quality. In this paper, statistically designed experiments were conducted to study the machinability of soda glass in UAD. The machinability was measured in terms of the cutting power, surface roughness Ra and Rz and the linear tool wear. Machining conditions include UAD and conventional drilling (CD), abrasive tool concentration, feedrate, and spindle speed. Analysis of variance (ANOVA) defined the significant factors and their interactions, while statistical models were used to predict the process responses used for assessment of machinability indices.
... My greatest thanks are reserved for my wife, Soaad El-Hofy, and my daughters Noha, Assmaa, an... more ... My greatest thanks are reserved for my wife, Soaad El-Hofy, and my daughters Noha, Assmaa, and Lina for their patience, support, and encour-agement during the preparation of the ... I would like to specifically acknowledge the help of I. Shyha, M. Hossam, and N. El-Breshy. ...
The machining of hard-to-cut materials with a high degree of precision and high surface quality i... more The machining of hard-to-cut materials with a high degree of precision and high surface quality is one of the most critical considerations when fabricating various state-of-the-art engineered components. In this investigation, a comprehensive three-dimensional model was developed and numerically simulated to predict kerf profiles and material removal rates while drilling the aluminum-7075-T6 aerospace alloy. Kerf profile and material removal prediction involved three stages: jet dynamic flow modeling, abrasive particle tracking, and erosion rate prediction . Experimental investigations were conducted to validate the developed model. The results indicate that the jet dynamic characteristics and flow of abrasive particles alter the kerf profiles, where the top kerf diameter increases with increasing jet pressure and standoff distance. The kerf depth and hole aspect ratio increase with jet pressure, but decrease with standoff distance and machining time. Cross-sectional profiles were characterized by progressive edge rounding and parabolic shapes. Defects can be minimized by utilizing high jet pressure and small standoff distance. The material removal rate increases with increasing jet pressure, abrasive particle size, and exposure time, but decreases with increasing standoff distance.
International Journal of Machining and Machinability of Materials, 2021
Recently, an ultrasonic vibration-assisted technique has been utilised to improve the hole-making... more Recently, an ultrasonic vibration-assisted technique has been utilised to improve the hole-making process of aerospace materials. However, there was a lack in discussing the effect of applying ultr...
Ultrasonic-assisted drilling (UAD) is a new process used for producing holes in the hard-to-cut a... more Ultrasonic-assisted drilling (UAD) is a new process used for producing holes in the hard-to-cut and brittle materials at high accuracy and surface quality. In this paper, statistically designed experiments were conducted to study the machinability of soda glass in UAD. The machinability was measured in terms of the cutting power, surface roughness Ra and Rz and the linear tool wear. Machining conditions include UAD and conventional drilling (CD), abrasive tool concentration, feedrate, and spindle speed. Analysis of variance (ANOVA) defined the significant factors and their interactions, while statistical models were used to predict the process responses used for assessment of machinability indices.
Uploads
Papers by Hassan El-Hofy