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-ve Ti-6Al-

Mustafa ubilay v Ucun

aslantas@aku.edu.tr

zet

-6Al-

Anahtar kelimeler: Mikro delik delme, Ti-6Al-

MICRO-MECHANICAL DRILLING PROCESS and AN EXPERIMENTAL STUDY FOR Ti-6Al-4V

Abstract

This paper presents a series of experimental study on the influence of cutting parameters and cooling conditions on the efficiency of micro drilling of Ti-6Al-4V. The variations of burr size, surface quality, cutting force and torque have been investigated in detail for different cutting and cooling conditions. Besides, the wear mechanism and wear type of micro drill were also examined. The experimental results show that the cooling method does not affect too much the burr size at the exit point of drill. However, it is possible to say that the burr size is minimum when using cryogenic cooling. Additionaly, the roughness of input surface of the drill is greater than the value of output surface. The dominant wear mechanism is abrasive wear in micro drills and built-up formation was observed in all cutting enviroment.

Keywords: Micro drilling, Ti6Al4V, Minimum quantity lubrication, Cryogenic cooling

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1. G

hem de

neden olabilir.

merkezinde [1]

inci derecede etkileyen

etkilemesi de kuvvetle muhtemeldir.

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na neden

Maksimum ilerleme kuvveti: a) f:0,025mm/dev, V:40m/dk; b) f:0,05mm/dev, V:40m/dk; c) f:0,025mm/dev, V:60m/dk; d) f:0,05mm/dev, V:60m/dk;

a) Ortalama tork, hata her bi tork verilerinin

-6Al-4V malzemesinin

elektro-

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2. MATERYAL ve METOT

-6Al-rak, 700

kesme parametreleri Tablo 1 deki gibidir. Deneylerde; kuru

incelenmesi

ele

Tablo 1

Devir (dev/dak) (m/dak)

(mm)

1000 2,2 1,5 3

2500 5,5 1,5 5000 11 1,5 7500 16,5 1,5 9000 19,8 1,5 10000 22 0,5 10000 22 1,5 10000 22 2,5 10000 22 3,5

d1 d2 L1 L2

3mm 40mm 4mm 2

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a)

b)

a)

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3.

-

-

kil 7- m ve fz=3,5-b de ise fz=1,5

artma

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ned-a ve 8-

rhangi bir -

-

-

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Vc=22m/dk

fz=1,5 m

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3.2

-a, 9- - -b -

ekil 10- -a dan da

lgesindeki

-a da dikkati

ifadesi

F2 > F1

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utlu

ade etmektedir.

Delinen mikro delikle

Delme

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-a), kriyojenik (13-b) ve MQL (13-

nimum

a bertaraf

(a)

geometri

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4. Mikro

(c)

geometri

(b) Ageometri

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dina

etkisiyle kesici kenar ra

olsa etkis 5.

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KAYNAKLAR

[1] Kim, J., Min, S. Dornfeld, D. 2001. Optimization and Control of Drilling Burr Formation of AISI 304L and AISI 4118 Based on Drilling Burr Control Charts International Journal of Machine Tools & Manufacture, Volume-41, Pages 923-936

[2] Xia, T., 2014, Investigation of drilling performance in cryogenic drilling on CFRP composite laminates Mechanical Engineering in the College of Engineering at the University of Kentucky

[3] Hong, S., Ding, Y., Jeong, W., 2001, Friction and cutting forces in cryogenic machining of Ti-6Al-4V International Journal of Machine Tools & Manufacture, Volume-41, Pages 2271-2285

-6Al-

[5] Bhowmick, S., Lukitsch, M., Alpas, A., 2010, Dry and minimum quantinity lubrication drilling of cast magnesium alloy International Journal of Machine Tools & Manufacture, Volume-50, Pages 444-457

The effect of minimum quantity lubrication and cryogenic pre-cooling on cutting performance in the micro milling of Inconel 718 Proc IMechE Part B: J Engineering Manufacture, DOI: 10.1177/0954