...Jay K. Raval; Bruce L. Tai Through-tool minimum quantity lubrication (MQL) drilling has been used in industry for decades, but little information is available on the coolant channel design and the effect on fluid distribution due to the inability of in-situ measurement. This study utilizes an Euler...

...Hongguang Liu; Hélène Birembaux; Yessine Ayed; Frédéric Rossi; Gérard Poulachon Drilling operation with cryogenic assistance is beneficial toward solving critical issues in machining difficult-to-cut materials and structures, especially in terms of improving surface integrity, elongating tool life...

...Yang Guo; James B. Mann Drilling with modulation-assisted machining (MAM) superimposes a low-frequency oscillation onto the drill feed motion. The otherwise continuous cutting in the drilling process is converted into a series of discrete cutting events. The result is a discrete chip formation...

...Rabiae Arif; Guillaume Fromentin; Frédéric Rossi; Bertrand Marcon This study presents a novel analysis of the machined subsurface layer formation dealing with strain hardening phenomenon which results from complex mechanisms due to cutting edge multiple passes in drilling. On the one hand...

...Jay K. Raval; Yi-Tang Kao; Bruce L. Tai The mist distribution is a critical factor in through-tool minimum quantity lubrication (MQL) drilling since a small amount of lubricant is used. However, it has rarely been discussed because of the difficulty in measuring the mist flow experimentally...

... June 5, 2014. Assoc. Editor: Y. B. Guo. 11 06 2013 17 05 2014 For a fully hardened steel material, hole surface microstructures are often subject to microstructural transition because of the intense thermomechanical loading. A white layer can be formed on the surface of a drilled...

... Following Drilling of Metallic-Composite Stacks ,” Int. J. Mach. Tools Manuf. , 51 , pp. 569 – 578 . 10.1016/j.ijmachtools.2011.04.007 [2] Park , K. H. , Beal , A. , Kim , D. , Kwon , P. , and Lantrip , J. , 2011 , “ Tool Wear in Drilling of Composite/Titanium Stacks...

...Benxin Wu; Sha Tao; Shuting Lei High-aspect-ratio microholes have many important applications, but their drilling is very challenging. Femtosecond (fs) laser ablation provides a potential solution, but involves many complicated physical processes that have not been well understood, which have...

...Bruce L. Tai; Andrew J. Jessop; David A. Stephenson; Albert J. Shih This paper presents the three dimensional (3-D) finite element analysis (FEA) to predict the workpiece thermal distortion in drilling multiple deep-holes under minimum quantity lubrication (MQL) condition. Heat sources...

...Masahiko Sato; Naoki Tamura; Hisataka Tanaka This paper describes the cyclic temperature variation beneath the rake face of a cutting tool in end milling. A newly developed infrared radiation pyrometer equipped with two optical fibers is used to measure the temperature. A small hole is drilled...

...M. M. Okasha; P. T. Mativenga, Ph.D.; L. Li, Ph.D. Mechanical microdrilling of nickel-based aerospace alloys suffers from premature drill breakage due to the fragile nature of the microdrill. Additionally, burr size reduction in both macro- and microscales has become one of the key problems...

...M. P. Jahan; T. Saleh; M. Rahman; Y. S. Wong This present study intends to investigate the feasibility of drilling deep microholes in difficult-to-cut tungsten carbide by means of low frequency workpiece vibration-assisted micro–electro-discharge machining (micro-EDM). A vibration device has been...

...Sinan Filiz; O. Burak Ozdoganlar Part I of this work presents a combined one-dimensional/three-dimensional approach for obtaining a unified model for the dynamics of micro- and macro-drills. To increase the numerical efficiency of the model, portions of the drill with circular cross-section (shank...

...Sinan Filiz; O. Burak Ozdoganlar In Part II of this work, an experimental study is conducted to validate the three-dimensional (3D-ST) drill dynamics model. Modal experiments on macro- and micro-drills are performed by exciting the drills with small piezoelectric elements directly attached...

.... In particular, lower cost and on-board sensors in conjunction with enhanced signal processing capabilities and improved networking has permitted significant enhancements to TCM capabilities. This paper presents an overview of TCM for drilling, turning, milling, and grinding. The focus of this paper...

...Martin B. G. Jun; Anna Carla Araujo This paper investigates a thread making process called thrilling, which performs both drilling and thread milling with one tool. A chip thickness and mechanistic cutting force model has been developed for a thread milling operation with a thrilling tool...

...Wenqian Hu; Yung C. Shin; Galen B. King Microhole drilling and microstructure machining with a picosecond (ps) Nd : YVO 4 laser (pulse duration of 10 ps) in metals, alloys, and ceramics are reported. Blind and through microholes are drilled by percussion drilling as well as trepanning drilling...

...Jung-Fa Hsieh Helical drill points provide a superior cutting performance, particularly when drilling microholes. Complex helical drill points retain the advantages of conventional helical drills while providing a further strengthening of the cutting edge. However, no methods currently exist...

...H. K. Sezer; L. Li Laser fabrication of cooling holes in certain parts of the aero-engine components involves percussion or trepan drilling at acute angles (e.g., 16–30 deg) to the surface. These parts are often covered with plasma sprayed ceramic thermal barrier coatings (TBCs) to protect them...

...; thanks to experimental stiffness measurements done on an ABB 940 Tricept robot. This robot is used in the industry for machining operations, such as grinding or drilling. A discussion about identifiable parameters is performed so as to best fit with experimental measurements. Finally, this model is used...