Results 211 to 220 of about 6,031 (262)
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The Performance of Small Diameter Twist Drills in Deep-Hole Drilling
Journal of Manufacturing Science and Engineering, Transactions of the ASME, 2006This paper investigates the performance of small diameter high-speed steel twist drills drilling boreholes with a depth of ten times the diameter into carbon steel AISI 1045 using minimum quantity lubrication. The performance of small twist drills is determined, first, by their deep-hole drilling capability, i.e., in how far the cutting forces can be ...
Robert Heinemann, Hinduja Srichand
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Simulation of the BTA deep-hole drilling process
Production Engineering, 2009The dynamic disturbances of the deep-hole drilling process pose a great challenge. Especially spiralling, which causes holes with several lobes, can damage the workpiece irreparably. The causes for spiralling are not well explored yet, and it is important to analyze which conditions and process parameters can cause the spiralling. This article presents
Dirk Biermann +2 more
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ANSYS is Used on Drilling Inner Blind Hole on Deep Hole
Wireless Personal Communications, 2018In this paper, the process of drilling inner blind hole on deep hole is simulated in the finite element software ANSYS, which can directly reflect the different influence of the cutting force on the bit when drilling. According to the result, designed a deep hole inner blind hole processing auto-device, introduce the design concept and working ...
Tianqi Wang +5 more
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HOLE QUALITY IN DEEP HOLE DRILLING
Materials and Manufacturing Processes, 2001Deep hole drilling represents the most economical method of hole producing with length-to-diameter ratios ≥5. The objective of this study was to ascertain the effect of machining parameters on hole quality produced by the deep hole machining process and to develop a better understanding of the effect of these process parameters on the hole quality ...
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Experimental Study of TC4 Titanium Alloy Deep Hole Drilling Based on Machine-Clamped Deep Hole Drill
2020 3rd International Conference on Electron Device and Mechanical Engineering (ICEDME), 2020There are many deep hole processing methods for TC4 titanium alloy, but it is a blank to drill with a mahine-clamped deep hole drill, so we have carried out some experi--mental studies. Using different spindle speed and feed in the test process of chip morphology and chip removal condition respectively and drill bit, the abrasion of guide block is ...
LIU Yan-shu, WANG Yu
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Forces in Deep-Hole Bone Drilling
Volume 1: Additive Manufacturing; Manufacturing Equipment and Systems; Bio and Sustainable Manufacturing, 2019Abstract Deep-hole bone drilling is performed in many surgical implantation procedures. Unlike bone drilling of shallow holes (commonly 5 to 7 mm in depth), deep-hole bone drilling requires a larger hole depth (i.e., up to a depth of approximately 35 mm in cochlear implantation) using a high ratio of the length to diameter of the drill ...
JuEun Lee +2 more
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Drilling deep holes in the continents
Geology Today, 1994A broad group of Earth scientists met recently in Potsdam, Germany, to develop an International Continental Drilling Program. What did they put on their wish list in an ambitious bid for our discipline to join the big spenders?
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Deep Offshore Slim Hole Drilling
Offshore Technology Conference, 1997Abstract This paper describes means of porting the Slim Hole Drilling concept to deep offshore applications. Slim Hole technology is now routinely used onshore. Positive results have been proven in terms of cost reduction, minimisation of the environmental impact of drilling activity, drilling efficiency and safety ...
T. Duhen, A. Sagot, Y. Kerbart
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Ecological Deep Hole Drilling by Novel Coated and Designed Drill
Key Engineering Materials, 2007Ecological deep hole drilling is proposed in this paper. The ecological drilling means a cutting without coolant or minimum quantity lubrication (MQL). Under a cutting condition with a small amount of lubrication, the drills should be designed availably to control heat generation during cutting.
Yoshihiko Murakami, Takahiro Yamamoto
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Deep Drill Holes in the Ocean Floor
The Geographical Journal, 1977The first attempt to drill through the sediments and basement of the oceanic crust was undertaken as part of Project Mohole, starting in 1957. Escalating costs stopped the Project in 1966 before the major drilling phase started. A parallel sediment drilling programme in the USA, however, got under way and led to the successful Deep Sea Drilling Project
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