• Title/Summary/Keyword: Deep drilling

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A Study on the Characteristics of Deep Hole Drilling Process Using Single Edge Drill with Small Diameters (미소직경의 Single Edge형 드릴을 사용한 심공드릴링 공정의 가공특성에 관한 연구)

  • 최성주;이우영;박원규
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.13 no.2
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    • pp.1-8
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    • 2004
  • Applications of the deep hole drilling process can be found in many industries ranging from large aerospace manufacturer to small tool and die shop. Deep hole drilling process with small diameter generally requires high quality and accuracy. But problems which may arise or result from the deep hole drilling process include drill breakage, the generation of a finished part surface which does not satisfy required quality, and process instability. To guaranty the required machining quality and accuracy, it is important to understand and improve the deep hole drilling process. In this study, deep hole drilling experiments using tingle edge drill with small diameter under 2mm have been carried out for difficult to cut materials such as C42CrMo4 and C45pb and the experimental results were analyzed. Feed force and torque versus feed showed linear relationship in both materials. The feed force and torque are decreased as cutting speed is increased but the trends are not uniform in C42CrMo4.

A Study on the Characteristics of BTA Deep Drilling for Marine Part Carbon and Alloy Steels

  • Sim, Sung-Bo;Kim, Chi-Ok
    • International Journal of Ocean Engineering and Technology Speciallssue:Selected Papers
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    • v.3 no.1
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    • pp.40-48
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    • 2000
  • The term "deep holes" is used to describe the machining of holes with a relatively large length to diameter ratio. The main feature of BTA deep hole drilling is the stabilization of cutting force necessary for the self guidance of the drill head. An additional feature is the cutting tool edges that are unsymmetrically placed on the drill head. There is an increasing necessity to predict the hole geometry and other dynamic stability behavior of deep hole drilling guidance. In this study, the effects of BTA deep hole drilling conditions on the hole profile machined piece are analyzed using domain analysis technique. The profile of deep hole drilled work piece is related to cutting speed, feed rate, chip flow, tool wear, and so on. This study deals with the experimental results obtained during the BTA drilling on SM45C, SM55C carbon steels and SCM440 steels under various cutting conditions, and these results are compared with analytical evaluations.aluations.

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A Study on Influence of the Cutting Fluid to Machinability in Deep Hole Drilling (Deep Hole Drilling에서 절삭유가 가공성에 미치는 영향에 관한 연구)

  • 장성규;이충일;전언찬
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1997.04a
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    • pp.1068-1072
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    • 1997
  • This work deals with on investigation the influence of various additives to a base stock cutting fluid in order to develop a better deep hold drilling. This investigation has been aiming at developing an oil which gives a maximum cutting efficiency at a minimum wear rate of the tool and the guiding pads. The purpose of study is to analyze how guide pad of tools, workpiece and the change of contained quantity of extreme pressure additive in cutting fluids have effects on the hold over size of cutting hole, surface roughness of workpiece,wear rates of guide pad and roundness during the deep hole machining of SM55C with solid BTA drill by using BTA drilling system through experiment. Conclusion reached is as follows. It has been proved that the contained quantity of surphur more affects machinability than that of extreme pressure additive of chlorine of cutting fluid in BTA drilling during Deep Hole Drilling. Considering its base oil, the the contained quantity of extreme pressure assitive of surphur can be different, but it's judged that the range of 1.5 ~ 2.0% is suitable to machinability for workpiece in BTA drilling. Regarding guide pad, it's judged that the reduction of wear is possible in propotion to the contained quantity of exrreme pressure additive of chlorine against supporting of cutting force and Bumishing operation of machining parts in cutting.

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Case Study of Ground Disturbance Characteristic due to Drilling Machine in Adjacent Deep Excavation (근접 깊은 굴착에서 천공장비에 의한 지반교란 특성 사례 연구)

  • 김성욱;한병원
    • Proceedings of the Korean Geotechical Society Conference
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    • 2003.03a
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    • pp.77-84
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    • 2003
  • Deep excavations in the urban areas have been frequently going on in large scale. Soil-nailing and Earth-anchor supporting methods are generally used in deep excavation. These construction methods cause ground disturbances during drilling process, and damages of adjacent structures and ground due to the differential settlement throughout construction period, and unexpected behaviors of supporting system according to the characteristics of drilling machine and ground condition. This article introduces two actual examples of adjacent deep excavation for the construction of university buildings in granitic Seoul area. The important results of construction and measurements obtained using Crawler drilling machine for Soil-nailing and Earth-anchor supporting methods are summarized. And some suggestions are given to improve and develop the technique of design and construction in the deep excavation projects having similar ground condition and supporting method.

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Semi-submersible Drilling Rig and Drilling Equipment (반 잠수식 시추선 및 주요장비에 대한 이해)

  • An, Byoung-Ky;Oh, Hyun-Jung
    • Journal of Ocean Engineering and Technology
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    • v.26 no.6
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    • pp.86-92
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    • 2012
  • An exploration well is drilled where oil or gas potential is shown by a seismic survey and interpretation. With the advance of drilling technology, most of the easily accessible oil had been developed by the end of the 20th century. To satisfy the ever increasing demand for oil, and bolstered by high oil prices, the major oil companies started to drill in deep water, which requires a deep offshore drilling unit. Offshore drilling units are generally classified by their maximum operating water depth. Many semi-submersible rigs have been purpose-designed for the drilling industry as the allowable drilling water depth has become deeper by the developed technics since the first semi-submersible was launched in 1963. Semi-submersible rigs are commonly used for shallow to deep water up to 3,000 m. Drilling equipment such as a top drive, blowout preventer, drawworks and power system, mud circulation system, and subsea wellhead system are explained to help with an understanding of offshore drilling procedures in the oil and gas fields. The objective of this paper is to introduce the main components of a semi-submersible rig and, by doing so, to raise the awareness of offshore drilling, which accounts for over 30% of the total oil production and will continue to increase.

A Study on the characteristic of micro deep hole drilling (마이크로 Deep hole 가공 특성에 관한 연구)

  • 김동우;조명우;이응숙;강재훈;민승기
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.1064-1067
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    • 2001
  • Micro drilling is used in the production of fuel injection nozzle, watch, camera, air bearing and pinted circuit boards(PCB) are demanded for high precision. Recently industries of precision production require more small hole, high aspect ratio and high speed working for micro deep hole drilling. But the undesirable characteristics of micro drilling is the small signal to noise ratios, wandering motion of drill, high aspect ratio and the increase of cutting force as cutting depth increase. So in this paper to obtain the optimization of cutting condition a study on the characteristics of micro deep hole drilling used Tool dynamometer is proposed.

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A Study on Real-time Drilling Parameters Prediction Using Recurrent Neural Network (순환신경망을 이용한 실시간 시추매개변수 예측 연구)

  • Han, Dong-kwon;Seo, Hyeong-jun;Kim, Min-soo;Kwon, Sun-il
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2021.05a
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    • pp.204-206
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    • 2021
  • Real-time drilling parameters prediction is a considerably important study from the viewpoint of maximizing drilling efficiency. Among the methods of maximizing drilling, the method of improving the drilling speed is common, which is related to the rate of penetration, drillstring rotational speed, weight on bit, and drilling mud flow rate. This study proposes a method of predicting the drilling rate, one of the real-time drilling parameters, using a recurrent neural network-based deep learning model, and compares the existing physical-based drilling rate prediction model with a prediction model using deep learning.

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A study on analysis of SM55C worked-shape in the BTA drilling (BTA 드릴링에 있어서 SM55C의 가공면 형상에 관한 연구)

  • 장성화
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • 1998.10a
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    • pp.84-89
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    • 1998
  • BTA drilling among the deep hole drilling is using for the improvement of productivity and the high-efficient working. As the deep hole drilling with BTA drill is satisfied with the required quality by one-pass processing, more deeper hole depth, the accuracy of materials is affected by bending vibration and cutting speed. This paper is studied that the shapes of material (surface roughness, roundness) is affected by cutting condition compared actual roundness with lobe shape with modeling of computer through the experiments in the BTA drilling system with BTA drill.

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A Study on Cutting Conditions of the Be-Cu Material in Micro Deep Hole Drilling Operation (미세심공드릴 가공에 있어서 Be-Cu 재료의 절삭조건에 관한 연구)

  • 김희남;유숙철;이형원;이원영;이종화;이인수
    • Journal of the Korea Safety Management & Science
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    • v.2 no.2
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    • pp.117-126
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    • 2000
  • Recently micro deep hole drilling is required in the whole industry. However, micro deep hole drilling has still much difficulty because of the lack of drill rigidity and the interruption of chip. We treated a micro deep hole(diameter 0.35mm, depth 3mm) used in a connector jack pin. Therefore, a surface roughness is very important. In this paper, we studied on the variation of the surface roughness for cutting conditions during micro deep hole drilling of Be-Cu material. Most of all, we tried to drill on CNC for the realization of automatization.

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Procedure of Drilling Operations for Site Characterization of High-Level Radioactive Waste Disposal Facility (고준위방사성폐기물 처분시설 부지 특성화를 위한 시추 절차서)

  • Dae-Sung Cheon;Jai-Yong Park
    • Tunnel and Underground Space
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    • v.34 no.5
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    • pp.477-502
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    • 2024
  • To effectively dispose of high-level radioactive waste, it is crucial to understand the geological characteristics of the deep rock at the disposal site where the disposal facility will be located. Deep drilling is essential in this process and can obtain multidisciplinary deep rock characteristics by conducting tests using recovered cores and various tests using boreholes. However, in Korea, there are currently no established guidelines or procedures for deep drilling aimed at sit investigation and characterization for high-level radioactive waste disposal. This report proposes a deep drilling procedure based on five years from 2020 of multipurpose deep drilling experience conducted for various rock types by the Korea Institute of Geoscience and Mineral Resources. The proposed procedure includes various processes such as health, safety, and environments, pre-drilling work, drilling work, circulating drilling water management, site characterization evaluation parameter acquisition tests and measurements, and sampling. These procedures will need to be continuously revised and amended in the future to meet the needs of drilling and HLW disposal industries and related fields, as well as to strengthen quality assurance under the Nuclear Safety Act.