Modelling Complex Force Systems, Part 1: The Cutting and Pad Forces in Deep Drilling

1993 ◽  
Vol 115 (2) ◽  
pp. 169-176 ◽  
Author(s):  
B. J. Griffiths
Keyword(s):  
Cutting Forces ◽  
Cutting Edge ◽  
Hole Drilling ◽  
Deep Hole ◽  
Deep Drilling ◽  
Force System ◽  
Friction Forces ◽  
Deep Hole Drilling ◽  
Drilling Operation ◽  
Force Systems

This paper is the first part of a two-part series which analyzes the complex force system existing within a deep hole drilling operation where cutting forces exist at a single cutting edge and burnishing and friction forces exist at two pads. In this first paper the forces at the pads and cutting edge are determined by (1) assuming that the pad forces are related by coefficients and (2) by the use of complimentary dynamometers.

Oberflächenkonditionierung beim Tiefbohren – Teil 2/Surface conditioning during deep drilling

2021 ◽  
Vol 111 (03) ◽  
pp. 118-123
Author(s):  
Andreas Zabel ◽  
Simon Strodick ◽  
Robert Schmidt ◽  
Frank Walther ◽  
Dirk Biermann ◽  
...  
Keyword(s):  
Sensor Technology ◽  
Hole Drilling ◽  
Process Conditions ◽  
Deep Hole ◽  
Process Data ◽  
Deep Drilling ◽  
Deep Hole Drilling ◽  
Surface Conditioning ◽  
Simulation Based

Der Beitrag befasst sich mit Teilaspekten bei der Entwicklung von Methoden zur gezielten, bearbeitungsparallelen Oberflächenkonditionierung beim Tiefbohren. Konkret handelt es sich um messtechnische und simulationsbasierte Ansätze zur Identifikation von thermomechanischen Prozesszuständen beim BTA- und ELB-Verfahren. Hierbei werden Möglichkeiten zur Gewinnung von Prozessdaten sowohl mit einer in-situ eingesetzten Sensorik als auch mit begleitend durchgeführten FEM-Simulationen betrachtet. Diese Daten bilden die Grundlage einer Prozessregelung für die beiden Tiefbohrverfahren. Im zweiten Teil werden nun die Arbeiten und Ergebnisse zum ELB-Tiefbohren behandelt.   The article deals with aspects of developing methods specifically for surface conditioning in deep hole drilling parallel to machining. This involves metrological and simulation-based approaches for identifying thermo-mechanical process conditions in both BTA and ELB process. Ways for obtaining process data both with sensor technology used in-situ and with FEM simulations performed concomitantly are investigated. These data form the basis of a deep hole process control. The second part presents the work and the results on single lip deep hole drilling.

A Role of the Resultant Cutting Force in Deep-Hole Drilling

1999 ◽  
Author(s):  
V. N. Latinovic ◽  
V. P. Astakhov ◽  
M. O. M. Osman
Keyword(s):  
Cutting Force ◽  
Static Stability ◽  
Optimal Location ◽  
Design Criterion ◽  
Hole Drilling ◽  
Deep Hole ◽  
Force Vector ◽  
Force System ◽  
Deep Hole Drilling

Abstract This paper present results of the analysis of a tool static stability in deep-hole drilling. The analysis has been carried out to determine the optimal location of the drill guide pads relative to the drill’s cutters (based upon criteria of equal total pad reactions and equal stability indicators). It is demonstrated that the optimal location can be achieved under asymmetrical location of the supporting pads relative to the direction of the resultant cutting force in a plane perpendicular to the drill axis. By consideration of the drill static force system in the plane which contains the drill axis and the resultant cutting force vector, a new design criterion is proposed. The essence of this concept is to design the deep-hole drills with minimum rubbing and wear of the guide pads and provide for the tool self-piloting.

scholarly journals A New Approach to Modelling the Drilling Torque in Conventional and Ultrasonic Assisted Deep-Hole Drilling Processes

2018 ◽  
Vol 8 (12) ◽  
pp. 2600 ◽  
Author(s):  
Ngoc-Hung Chu ◽  
Dang-Binh Nguyen ◽  
Nhu-Khoa Ngo ◽  
Van-Du Nguyen ◽  
Minh-Duc Tran ◽  
...  
Keyword(s):  
Hole Drilling ◽  
Deep Hole ◽  
Deep Drilling ◽  
Stick Slip ◽  
New Approach ◽  
Deep Hole Drilling ◽  
New Model ◽  
Analysis Technique ◽  
Proposed Model ◽  
Ultrasonic Assisted

This paper presents a new approach to developing the torque model in deep hole drilling, both for conventional and ultrasonic assisted drilling processes. The model was proposed as a sum of three components: the cutting, the chip evacuation and the stick-slip torques. Parameters of the new model were carried out by applying the regression analysis technique, with the correlation values higher than 0.999. The data were collected from 36 experimental dry drilling tests, both in conventional and ultrasonic assisted cutting conditions, with the depth-to-diameter of the drilled holes of 7.5. The major advantage of the new model compared to previous models is that the new model of chip-evacuation torque has only one coefficient, thus making it easier to evaluate and compare different deep-drilling processes. The effectiveness of ultrasonic assistance in deep hole drilling was also highlighted using the proposed model. The new model is promising to predict critical depth and torque in deep hole drilling.

Development of Deep Hole Drilling Technology for Tube Sheet of Steam Generator

2014 ◽  
Author(s):  
Shinichiro Ueda ◽  
Takuya Yagishita ◽  
Jun Maeno ◽  
Masanari Okuda
Keyword(s):  
Steam Generator ◽  
Control Technique ◽  
Hole Drilling ◽  
Drilling Machine ◽  
Tube Sheet ◽  
Deep Hole ◽  
Steam Generators ◽  
Deep Hole Drilling ◽  
Drilling Operation ◽  
Drilling Technology

Advanced PWR nuclear power plant has very-large steam generators of which tube-sheet is diameter 5000mm / thickness 500 mm / weight 100 ton or larger. Drilling of very thick tube sheet needs deep-hole drilling technique with strict dimensional tolerance control. In addition, the tube sheet has 10,000 or more tube holes, which means that stable drilling operation is mandatory for productivity control. Upon such background, steam generator tube sheet drilling operation needs precise dimensional control technique with highly efficient productivity. In this study, authors did (1) feasibility-study and development of deep hole drilling machine with the Boring and Trepanning Association (BTA) method, (2) cutting parameter evaluation such as feed rate and cutting velocity, (3) tube hole measurement system development, and (4) drill exchange program development with monitoring drilling machine motor loads and setting alarm level for the loads. Based on techniques developed by this study, IHI has achieved high-accuracy and stable deep-hole drilling technology for very-thick tube sheets applicable to the very-large steam generators.

Influence of the Cutting Speed and Feed Rate on Torque, Feed Force, Roughness and Shape of the Chips During Deep Hole Drilling

2013 ◽  
Vol 10 (2) ◽  
pp. 11-14
Author(s):  
Martin Letavay ◽  
M. Laluha ◽  
Jozef Pilc
Keyword(s):  
Feed Rate ◽  
Cutting Forces ◽  
Cutting Speed ◽  
Hole Drilling ◽  
Deep Hole ◽  
Deep Hole Drilling ◽  
Feed Force ◽  
Gun Drill ◽  
Steel Grades

Abstract This article describes methodology and realization of the deep hole drilling test. Goal of this trial is to define influence of the cutting speed and feed rate on torque and feed force. As well as during the test here was a focus on roughness and shape of the chips. A gun drill was used for deep hole drilling and we used etalon material, were here is possible to define cutting forces without any further testing of different steel grades. Also there is a description of CNC program, which was used for above mentioned testing and it can be utilized during other different trials.

scholarly journals Experimental and simulative investigation of the oil distribution during a deep-hole drilling process and comparing of the RANS kω-SST and RANS hybrid SAS-SST turbulence model

2018 ◽  
Vol 1 (4) ◽  
Author(s):  
Ekrem Oezkaya
Keyword(s):  
Cfd Simulation ◽  
Fluid Dynamic ◽  
Hole Drilling ◽  
Experimental Investigations ◽  
Drilling Process ◽  
Deep Hole ◽  
Deep Drilling ◽  
Deep Hole Drilling ◽  
Sst Model ◽  
Cooling And Lubrication

Helical deep hole drilling is a process frequently used in industrial applications to produce bores with a large length to diameter ratio. For better cooling and lubrication, the deep drilling oil is fed directly into the bore hole via two internal cooling channels. Due to the inaccessibility of the cutting area, experimental investigations that provide information on the actual machining and cooling behavior are difficult to carry out. In this paper, the distribution of the deep drilling oil is investigated both experimentally and simulatively and the results are evaluated. For the Computational Fluid Dynamics (CFD) simulation, two different turbulence models, i.e. the RANS k-ω-SST and hybrid SAS-SST model, are used and compared. Thereby, the actual used deep drilling oil is modelled instead of using fluid dynamic parameters of water, as is often the case. With the hybrid SAS-SST model, the flow could be analyzed much better than with the RANS k-ω-SST model and thus the processes that take place during helical deep drilling could be  simulated with realistic details. Both the experimental and the simulative results show that the deep drilling oil movement is almost exclusively generated by the tool rotation. At the tool’s cutting edges and in the flute, the flow velocity drops to zero for the most part, so that no efficient cooling and lubrication could take place there. In addition, cavitation bubbles form and implode, concluding in the assumption that the process heat is not adequately dissipated and the removal of chips is adversely affected, which in turn can affect the service life of the tool and the bore quality. The carried out investigations show that the application of CFD simulation is an important research instrument in machining technology and that there is still great potential in the area of tool and process optimization.

Deep Hole Drilling Technique (DHD)

2019 ◽  
Vol 88 (6) ◽  
pp. 485-488
Author(s):  
Shinji KAWAI ◽  
Takuya NAGAI ◽  
Shigetaka OKANO
Keyword(s):  
Hole Drilling ◽  
Deep Hole ◽  
Deep Hole Drilling ◽  
Drilling Technique

scholarly journals Temperature monitoring in the subsurface during single lip deep hole drilling

2020 ◽  
Vol 87 (12) ◽  
pp. 757-767
Author(s):  
Robert Wegert ◽  
Vinzenz Guski ◽  
Hans-Christian Möhring ◽  
Siegfried Schmauder
Keyword(s):  
Cutting Parameters ◽  
Drill Hole ◽  
Machining Process ◽  
Hole Drilling ◽  
Drilling Process ◽  
Deep Hole ◽  
Machining Processes ◽  
Deep Hole Drilling ◽  
Feed Force ◽  
Cutting Zone

AbstractThe surface quality and the subsurface properties such as hardness, residual stresses and grain size of a drill hole are dependent on the cutting parameters of the single lip deep hole drilling process and therefore on the thermomechanical as-is state in the cutting zone and in the contact zone between the guide pads and the drill hole surface. In this contribution, the main objectives are the in-process measurement of the thermal as-is state in the subsurface of a drilling hole by means of thermocouples as well as the feed force and drilling torque evaluation. FE simulation results to verify the investigations and to predict the thermomechanical conditions in the cutting zone are presented as well. The work is part of an interdisciplinary research project in the framework of the priority program “Surface Conditioning in Machining Processes” (SPP 2086) of the German Research Foundation (DFG).This contribution provides an overview of the effects of cutting parameters, cooling lubrication and including wear on the thermal conditions in the subsurface and mechanical loads during this machining process. At first, a test set up for the in-process temperature measurement will be presented with the execution as well as the analysis of the resulting temperature, feed force and drilling torque during drilling a 42CrMo4 steel. Furthermore, the results of process simulations and the validation of this applied FE approach with measured quantities are presented.

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