Results 51 to 60 of about 141,733 (202)
MATEC Web of Conferences, 2016 This paper presents an experimental investigation of deep hole drilling using CNC milling machine. This experiment investigates the effect of machining parameters which are spindle speed, feed rate and depth of hole using minimum quantity lubricant on ...
Kamaruzaman Anis Farhan +3 more
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Directional drilling technologies equipment and application for hard rock in underground coal mines
Meikuang Anquan, 2021 According to the problems existing in directional drilling of hard rock in coal mines, such as low drilling efficiency, easy bearing pressure in deep hole drilling and easy damage of drilling tools in hole, based on the analysis of the causes of the ...
DOU Xuqian, WANG Li
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Effects on surface and peripheral zone during single lip deep hole drilling
, 2020 To adjust the defined surface and peripheral zone properties, such as hardness, residual stresses and surface quality, machining processes are in many cases followed by forming or heat treatment processes.
R. Wegert +3 more
semanticscholar +1 more source
Natural Gas Industry B, 2016 The Yuanba Gasfield is a large gas field discovered by Sinopec in the Sichuan Basin in recent years, and another main exploration area for natural gas reserves and production increase after the Puguang Gasfield.
Jiaxiang Xia +2 more
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Two Massive Hydraulic Tests Completed in Deep KTB Pilot Hole [PDF]
Scientific Drilling, 2006 The German Continental Deep Drilling Program (KTB)boreholes in Windischeschenbach, Bavaria, Germany have revealed a wealth of geoscientific data during the years of pre-drilling surveys (1984–1986), the drilling phase (1987–1994), and the subsequent deep-
Serge A. Shapiro +2 more
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Spiralling in BTA Deep-hole Drilling: Models of Varying Frequencies [PDF]
, 2006 One serious problem in deep-hole drilling is the formation of a dynamic disturbance called spiralling which causes holes with several lobes. Since such lobes are a severe impairment of the bore hole the formation of spiralling has to be prevented. Gessesse et al.
Theis, Winfried +3 more
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, 2020 BTA deep hole drilling is required for a variety of drilling applications with high length-to-diameter-ratios and high qualities. It is one of the latest machining operation in the production chain.
J. Gerken +3 more
semanticscholar +1 more source
工程科学与技术, 2022 In view of the large terrain elevation difference along the Sichuan—Tibet railway, the steep topography of the long and large buried depth tunnel project, extremely poor traffic conditions, and the inability to implement vertical deep hole exploration ...
Zhengxuan XU +6 more
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Tool Wear Mechanism and Experimental Study on Deep Hole Gun Drilling of 304 Stainless Steel
Transactions of Nanjing University of Aeronautics and AstronauticsDeep hole gun drilling is in a closed and semi-closed state， and the machining process is complex. The unstable drilling force， severe tool wear， and poor processing quality have always been difficulties in deep hole gun drilling. 304 stainless steel has
JIANG Jitao +4 more
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دراسة تأثير الشكل الهندسي لمقدمة بريمة الثقب العميق على خواص الثقوب المنتجة [PDF]
Engineering and Technology Journal, 2008 The term deep hole originally reffered to hole depth over (5* diameter)Deep hole drilling is a collective name for method for machining both short anddeep holes.
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