Drilling is a widely used machining process. As the hole drilling operation progresses, a drill-bit gradually degrades until it breaks at the end of its life. Replacing a drill-bit after it is breakage can be costly in certain special applications. At the same time an early tool replacement decision may lead to lower tool life utilisation. This calls for methods that enable accurate prediction ...

The frictional resistance on a fault during slip controls earthquake dynamics. Friction dissipates heat during an earthquake; therefore, the fault temperature after an earthquake provides insight into the level of friction. The Japan Trench Fast Drilling Project (Integrated Ocean Drilling Program Expedition 343 and 343T) installed a borehole temperature observatory 16 months after the March 201...

A theoretical framework is established for constructing arbitrary particle-laden jetflow by means of fractal sets in the sense of average scale. This novel approach involves three main coherent components, in which one (1) searches for an appropriate original point set and confirms its intrinsic properties such as chaos, symmetry and density distribution; (2) derives governing equations for the...

Scheduling in the drilling operation of the printed circuit board industry deeply annoys the production management staff on the shop floor due to its high complexity of permutations or combination of jobs, machines, and resource constraints. In this research, two multi-objective genetic algorithms are proposed to deal with such a complicated real-world case. Real-world instances are applied as ...

During the past decade, polymer nanocomposites have emerged relatively as a new and rapidly developing class of composite materials and attracted considerable investment in research and development worldwide.Direct machining of polymers can be an option for personalized products and for manufacturing product samples. To obtain high quality products and reduce machining costs, it is very importa...

Progress in Petrochemical Science Study of Formation Damage Mechanism Affected by Drilling Fluid Lost During the Operation Using Special Additives Materials Kioumars Taheri* and Farhad Mohammad Torab Department Mining Metallurgical Engineering, Yazd University, Iran *Corresponding author: Taheri, Yazd, Submission: October 21, 2022;Published: January 10, 2023 DOI: 10.31031/PPS.2023.04.000597 ISS...

during the past decade, polymer nanocomposites have emerged relatively as a new and rapidly developing class of composite materials and attracted considerable investment in research and development worldwide.direct machining of polymers can be an option for personalized products and for manufacturing product samples. to obtain high quality products and reduce machining costs, it is very importa...

the conventional tunneling procedures for example drilling, charging, blasting, loading and supporting, are highly developed. new tunneling machines have recently come into operation and others are under construction or development. impactors are used in large numbers in the coal mining industry. face-heading machines are successfully used in new tunneling procedures in both soft and medium-har...

This paper presents a new methodology to predict the wear for three-cone bits under varying operating conditions. In this approach, six variables (weight on bit, rotary speed, pump rate, formation hardness, bit type, and torque) were studied over a range of values. A simulator was used to generate drlling data to eliminate arrors coherent to field measurements. The data generated was used to es...