Design and Experiment of High-speed Deep Hole Drilling for Difficult-to-Cut Materials

Recently, the trends of industrial products move towards more miniaturization, variety and mass production. Micro drilling which take high precision in cutting work is required to perform more micro hole and high speed working. Especially, Micro deep hole drilling is becoming more important in a wide spectrum of precision production industries, ranging from the production of automotive fuel injection nozzle, watch and camera parts, medical needles, and thick multilayered Printed Circuit Boards(PCB) that are demanded for very high density electric circuitry. The industries of precision production require smaller holes, high aspect ratio and high speed working for micro deep hole drilling. However 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 increases. In order to optimize cutting conditions, an experimental study on the characteristics of micro deep hole machining processes using a tool dynamometer was carried out. And additionally, microscope with built-in an inspection monitor showed the relationship between burr in workpieces and chip form of micro drill machining.

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The Study on Evaluation of Hybrid Drilling Command under Deep Hole Drilling

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.579.219 ◽

2012 ◽

Vol 579 ◽

pp. 219-226

Author(s):

Jen Ching Huang ◽

Wei Piao Wu

Keyword(s):

Tool Life ◽

High Speed ◽

Small Hole ◽

Hole Drilling ◽

Deep Hole ◽

Cnc Machine ◽

Drilling Depth ◽

Deep Hole Drilling ◽

Peck Drilling ◽

Custom Macro

The hybrid drilling command was proposed in this study. The hybrid drilling command is established by combined the merit of G73 (high speed peck drilling cycle) and G83 (small hole peck drilling cycle) using custom macro command. The concept of hybrid drilling command is to divide the total drilling depth into several distances and its distance is shortened gradually. The drilling chip is breaking with the G73 in the distance between each one and banishing from the hole with the G83 after drilling a distance each time. The evaluation on the merit of hybrid drilling command was carried out by deep hole drilling test on CNC machine center. After experiments, the hybrid drilling command can reduce wearing, extending the tool life of the driller and shorten processes time.

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The Performance of Small Diameter Twist Drills in Deep-Hole Drilling

Journal of Manufacturing Science and Engineering ◽

10.1115/1.2335859 ◽

2006 ◽

Vol 128 (4) ◽

pp. 884-892 ◽

Cited By ~ 20

Author(s):

Robert Heinemann ◽

Srichand Hinduja ◽

George Barrow ◽

Gerhard Petuelli

Keyword(s):

Tool Life ◽

High Speed ◽

Small Diameter ◽

High Speed Steel ◽

Minimum Quantity Lubrication ◽

Hole Drilling ◽

Deep Hole ◽

Deep Hole Drilling ◽

Flute Surface ◽

Twist Drills

This 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 kept at a noncritical level by maintaining the chip disposal, and, second, by their tool life. This work shows that both the deep-hole drilling capability and tool life of small drills are strongly dependent on their geometry, in particular the size of the chip flutes, and the flute surface topography.

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Deep hole drilling of AISI 1045 via high-speed steel twist drills: evaluation of tool wear and hole quality

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-017-0587-4 ◽

2017 ◽

Vol 93 (1-4) ◽

pp. 1115-1125 ◽

Cited By ~ 7

Author(s):

Sarmad Ali Khan ◽

Aamer Nazir ◽

Mohammad Pervez Mughal ◽

Muhammad Qaiser Saleem ◽

Amjad Hussain ◽

...

Keyword(s):

Tool Wear ◽

High Speed ◽

High Speed Steel ◽

Hole Drilling ◽

Deep Hole ◽

Hole Quality ◽

Deep Hole Drilling ◽

Aisi 1045 ◽

Twist Drills

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Based on the drilling operation of different drilling RIGS, the technical conditions of deep hole drilling in soft surrounding rock are discussed

Advance in Civil Engineering ◽

10.35534/ace.0202009c ◽

2020 ◽

Vol 2 (2) ◽

pp. 46-51

Author(s):

Liu Mingyu

Keyword(s):

Surrounding Rock ◽

Hole Drilling ◽

Deep Hole ◽

Deep Hole Drilling ◽

Drilling Operation ◽

Drilling Rigs

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Deep Hole Drilling Technique (DHD)

JOURNAL OF THE JAPAN WELDING SOCIETY ◽

10.2207/jjws.88.485 ◽

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

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Temperature monitoring in the subsurface during single lip deep hole drilling

tm - Technisches Messen ◽

10.1515/teme-2020-0055 ◽

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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