Experimental investigation of cutting forces and tool wear during laser-assisted milling of Ti-6Al-4V alloy

Abstract

The improvement of machinability during laser-assisted milling of Ti-6Al-4V alloy was investigated. The effects of laser processing and milling parameters on cutting forces and tool wear have been examined. It is found that local heating and softening of the workpiece by the laser beam in front of the cutting tool significantly reduced the cutting forces, especially the force in the feed direction during up-cut milling. Laser power, tool–beam distance, depth of cut and cutting speed are the parameters influencing the change of feed force during laser-assisted milling. Analysis of the workpiece temperature rise due to laser beam heating shows that the feed force is strongly dependent on the workpiece temperature in front of the cutting zone; significant reduction of feed force occurred when the temperature in front of thecutting zone was in the range 200–450°C. Edge chipping is found to be the tool failure mode for both conventional milling and laser-assisted milling. A significant improvement in tool life during laser-assisted milling was obtained when the workpiece temperature in front of the cutting zone was at an optimum value. Compressed air was used to remove the chip from the cutting tool, which made the milling process more effective. The optimum workpiece temperature in front of the cutting zone with compressed air delivered through the spindle is about 350°C, higher than that with compressed air delivered through a stationary nozzle (about 230°C). The maximum tool life in the former case is much longer than that in the latter case.

Keywords

laser-assisted milling laser power cutting force workpiece temperature in front of the cutting zone tool wear compressed air cooling

References

Boyer

R. R.

. An overview on the use of titanium in the aerospace industry. Mater. Sci. Engng A, 1996, 213(1–2), 103–114.

Ezugwu

E. O.

Wang

Z. M.

. Titanium alloys and their machinability: A review. J. Mater. Process. Technol, 1997, 68(3), 262–274.

Ezugwu

E. O.

Bonney

Yamane

. An overview of the machinability of aeroengine alloys. J.Mater. Process. Technol, 2003, 134(2), 233–253.

Yang

Liu

C. R.

. Machining titanium and its alloys. Machining Sci. Technol, 1999, 3(1), 107–139.

Hua

Shivpuri

. A cobalt diffusion based model for predicting crater wear of carbide tools in machining titanium alloys. J. Engng. Mater. Technol., Trans. ASME, 2005, 127(1), 136–144.

Zhang

J. F.

Deng

J. X.

Y. S.

. Investigation on diffusion wear during high-speed machining Ti-6Al-4V alloy with straight tungsten carbide tools. Int. J. Adv. Manuf. Technol, 2009, 44(1–2), 17–25.

Jawaid

Che-Haron

C. H.

Abdullah

. Tool wear characteristics in turning of titanium alloy Ti-6246. J. Mater. Process. Technol, 1999, 92–93, 329–334.

Wang

Z. G.

Rahman

Wong

Y. S.

. Tool wearcharacteristics of binderless CBN tools used in high-speed milling of titanium alloys. Wear, 2005, 258(5–6), 752–758.

Wang

Zhang

Y. Z.

. Diffusion wear in millingtitanium alloys. Mater. Sci. Technol, 1988, 4(6), 548–553.

10.

Dearnley

P. A.

Grearson

A. N.

. Evaluation of principal wear mechanisms of cemented carbides and ceramics used for machining titanium alloy, IMI 318. Mater. Sci. Technol, 1986, 2(1), 47–58.

11.

Wang

Z. G.

Wong

Y. S.

Rahman

. High-speed milling of titanium alloys using binderless CBN tools. Int. J. Mach. Tools Manuf, 2005, 45(1), 105–114.

12.

Cantero

J. L.

Tardío

M. M.

Canteli

J. A.

Marcos

Miguélez

M. H.

. Dry drilling of alloy Ti-6Al-4V. Int. J. Mach. Tools Manuf, 2005, 45(11), 1246–1255.

13.

Machado

A. R.

Wallbank

Ezugwu

E. O.

Pashby

I. R.

. Tool performance and chip control when machining Ti-6Al-4V and Inconel 901 using high pressure coolant supply. Machin. Sci. Technol, 1998, 2(1), 1–12.

14.

Nandy

A. K.

Gowrishankar

M. C.

Paul

. Some studies on high-pressure cooling in turning of Ti-6Al-4V. Int. J. Mach. Tools Manuf, 2009, 49(2), 182–198.

15.

Hong

S. Y.

Ding

. Cooling approaches and cutting temperatures in cryogenic machining of Ti-6Al-4V. Int. J. Mach. Tools Manuf, 2001, 41(10), 1417–1437.

16.

Hong

Markus

Jeong

W.-C.

. New coolingapproach and tool life improvement incryogenic machining of titanium alloy Ti-6Al-4V. Int. J. Mach. Tools Manuf, 2001, 41(15), 2245–2260.

17.

Wang

Z. Y.

Rajurkar

K. P.

. Cryogenic machining of hard-to-cut materials. Wear, 2000, 239(2), 168–175.

18.

Sun

Brandt

Dargusch

M. S.

. Machining Ti-6Al-4V alloy with cryogenic compressed air cooling. Int. J. Mach. Tools Manuf, 2010, 50(11), 933–942.

19.

Rozzi

J. C.

Pfefferkorn

F. E.

Shin

Y. C.

Incropera

F. P.

. Experimental evaluation of the laser assisted machining of silicon nitride ceramics. J. Manuf. Sci. Engng, Trans. ASME, 2000, 122(4), 666–670.

20.

Pfefferkorn

F. E.

Shin

Y. C.

Incropera

F. P.

Tian

. Laser-assisted machining of magnesia-partially-stabilized zirconia. J. Manuf. Sci. Engng, Trans. ASME, 2004, 126(1), 42–51.

21.

Anderson

Patwa

Shin

Y. C.

. Laser-assisted machining of Inconel 718 with an economic analysis. Int. J. Mach. Tools Manuf, 2006, 46(14), 1879–1891.

22.

Germain

Lebrun

J. L.

Braham-Bouchnak

Bellett

Auger

. Laser-assisted machining of Inconel 718 with carbide and ceramic inserts. Int. J. Mater. Forming, 2008, 1(1), 523–526.

23.

Ding

Shin

Y. C.

. Laser-assisted machining ofhardened steel parts with surface integrity analysis. Int. J. Mach. Tools Manuf, 2010, 50(1), 106–114.

24.

Germain

Morel

Lebrun

J.-L.

Morel

. Machinability and surface integrity for a bearing steel and a titanium alloy in laser assisted machining optimisation on LAM on two materials. Lasers Engng, 2007, 17(5–6), 329–344.

25.

Dandekar

C. R.

Shin

Y. C.

Barnes

. Machinability improvement of titanium alloy (Ti-6Al-4V) via LAM and hybrid machining. Int. J. Mach. Tools Manuf, 2010, 50(6), 174–182.

26.

Sun

Harris

Brandt

. Parametric investigation of laser-assisted machining of commercially pure titanium. Adv. Engng. Mater, 2008, 10(6), 565–572.

27.

Sun

Brandt

Dargusch

M. S.

. Thermally enhanced machining of hard-to-machine materials: A review. Int. J. Mach. Tools Manuf, 2010, 50(8), 663–680.

28.

Yang

Lei

. Laser-assisted milling of silicon nitride ceramic: A machinability study. Int. J. Mechatronics Manuf. Syst, 2008, 1(1), 116–130.

29.

Barnes

J. E.

Shin

Y. C.

Brandt

Sun

. High speed machining of titanium alloys. Mater. Sci. Forum, 2009, 618–619, 159–163.

30.

Ding

Chen

S.-J.

Cheng

. Two-dimensional vibration-assisted micro end milling: Cutting force modelling and machining process dynamics. Proc IMechE, Part B: J. Engng. Manuf, 2010, 224(12), 1775–1783.

31.

Bareggi

O’Donnell

G. E.

Torrance

. Modelling and experimental analysis of high speed air jets used during metal cutting as a cooling technique. 2008, Proceedings of the 3rd CIRP International Conference on High Performance Cutting

Dublin, Ireland

337–346.

32.

Kops

Arenson

. Determination of convective cooling conditions in turning. Ann. ClRP, 1999, 48(1), 47–52.

33.

Alauddin

Mazid

M. A.

Baradi

M. A. E.

Hashmi

M. S. J.

. Cutting forces in the end milling of Inconel 718. J. Mater. Process. Technol, 1998, 77(1–3), 153–159.

34.

Rozzi

J. C.

Incropera

F. P.

Shin

Y. C.

. Transient, three-dimensional heat transfer model for the laser assisted machining of silicon nitride: II. Assessment of parametric effects. Int. J. Heat Mass Transfer, 2000, 43(8), 1425–1437.

35.

Pfefferkorn

F. E.

Incropera

F. P.

Shin

Y. C.

. Heat transfer model of semi-transparent ceramics undergoing laser-assisted machining. Int. J. Heat Mass Transfer, 2005, 48(10), 1999–2012.

36.

Rozzi

J. C.

Pfefferkorn

F. E.

Incropera

F. P.

Shin

Y. C.

. Transient, three-dimensional heat transfer model for the laser assisted machining of silicon nitride: I. Comparison of predictions with measured surface temperature histories. Int. J. Heat Mass Transfer, 2000, 43(8), 1409–1424.

37.

Tian

Anderson

Shin

Y. C.

. Laser-assisted milling of silicon nitride and Inconel 718. J.Manuf. Sci. Engng, Trans. ASME, 2008, 130(3), 1–9.

38.

Yang

Sun

Brandt

Yan

. Experimental investigation and 3D finite element prediction of the heat affected zone during laser assisted machining of Ti6Al4V alloy. J. Mater. Process. Technol, 2010, 210(15), 2215–2222.

39.

Zaeh

M. F.

Wiedenmann

Daub

. A thermal simulation model for laser-assisted milling. Physics Procedia, 2010, 5(2), 353–362.

40.

Sun

Brandt

Dargusch

M. S.

. The effect of a laser beam on chip formation during machining of Ti6Al4V alloy. Metall. Mater. Trans. A, 2010, 41(6), 1573–1581.

41.

Vonatsos

K. N.

Pantelis

D. I.

. Approximate solutions for the evaluation of the depth of laser-melted zones. Appl. Phys. A, 2005, 80(4), 885–889.

42.

Dahotre

N. B.

Harimkar

S. P.

. Laser Fabrication and Machining of Materials, 2008 (Springer, New York) 40–43.

43.

Sutter

Molinari

. Analysis of the cutting force components and friction in high speed machining. J. Manuf. Sci. Engng, Trans. ASME, 2005, 127(2), 245–250.

44.

Matthew

Oxley

P. L. B.

. Predicting the effect of very high cutting speeds on cutting forces etc. Ann. ClRP, 1982, 31(1), 49–52.

45.

Sun

Brandt

Dargusch

M. S.

. Characteristics of cutting forces and chip formation in machining of titanium alloys. Int. J. Mach. Tools Manuf, 2009, 49(7–8), 561–568.

46.

Rösler

Bäker

Siemers

. Tönshoff

H. K.

Hollmann

. Mechanisms of chip formation. Hochgeschwindigkeitsspanen metallischer Werkstoffe, 2005 (Wiley-VCH Verlag, Weinheim) 492–514.

47.

Ahmed

Rack

H. J.

. Phase transformations during cooling in α + β titanium alloys. Mater. Sci. Engng A, 1988, 243(1–2), 206–211.

48.

Lacalle

L. N. L.d.

Pérez

Llorente

J. I.

Sánchez

J. A.

. Advanced cutting conditions for the milling of aeronautical alloys. J. Mater. Process. Technol, 2000, 100(1–3), 1–11.

49.

Anderson

Shin

Y. C.

. Laser-assisted machining of an austenitic stainless steel: P550. Proc. Imeche, Part B: J. Engng Manuf, 2006, 220(12), 2055–2067.