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

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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Cutting-fluid flow with chip evacuation during deep-hole drilling with twist drills

European Journal of Mechanics - B/Fluids ◽

10.1016/j.euromechflu.2021.07.003 ◽

2021 ◽

Author(s):

Andreas Baumann ◽

Ekrem Oezkaya ◽

Dirk Schnabel ◽

Dirk Biermann ◽

Peter Eberhard

Keyword(s):

Fluid Flow ◽

Cutting Fluid ◽

Hole Drilling ◽

Deep Hole ◽

Deep Hole Drilling ◽

Twist Drills

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Hole quality and interelectrode gap dynamics during pulse current electrochemical deep hole drilling

The International Journal of Advanced Manufacturing Technology ◽

10.1007/s00170-006-0572-9 ◽

2006 ◽

Vol 34 (1-2) ◽

pp. 79-95 ◽

Cited By ~ 32

Author(s):

Dayanand S. Bilgi ◽

V. K. Jain ◽

R. Shekhar ◽

Anjali V. Kulkarni

Keyword(s):

Pulse Current ◽

Hole Drilling ◽

Gap Dynamics ◽

Deep Hole ◽

Hole Quality ◽

Deep Hole Drilling ◽

Interelectrode Gap

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New Experiments on the Temperature Distribution in Drilling

Journal of Engineering Materials and Technology ◽

10.1115/1.3225709 ◽

1984 ◽

Vol 106 (3) ◽

pp. 242-247 ◽

Cited By ~ 9

Author(s):

A. Thangaraj ◽

P. K. Wright ◽

M. Nissle

Keyword(s):

Temperature Distribution ◽

High Speed ◽

Metal Flow ◽

High Speed Steel ◽

Twist Drill ◽

Temperature Distributions ◽

Aisi 1045 Steel ◽

Aisi 1045 ◽

1045 Steel ◽

Twist Drills

Using metallographic and microhardness techniques, temperature distributions have been determined in twist drills. The methods rely on the fact that certain high speed steel materials exhibit microstructural changes when subjected to temperatures greater than 600°C. Quick-stop specimens have also been obtained to study the metal flow patterns over the drill flutes. These results have been used to comment on the different wear mechanisms that affect the performance of a twist drill. Preliminary results show that bulk plastic flow occurs near the margin of the drill where the temperatures are in the vicinity of 900°C when machining AISI 1045 steel at 40 m/min.

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A Study on the Characteristics of Micro Deep Hole Machining Processes

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.364-366.566 ◽

2007 ◽

Vol 364-366 ◽

pp. 566-571

Author(s):

Tae Il Seo ◽

Dong Woo Kim ◽

Myeong Woo Cho ◽

Eung Sug Lee

Keyword(s):

Aspect Ratio ◽

High Aspect Ratio ◽

High Speed ◽

Printed Circuit Boards ◽

Hole Drilling ◽

Deep Hole ◽

Machining Processes ◽

Deep Hole Drilling ◽

Micro Drilling ◽

Hole Machining

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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