Increasing the pressure of abrasive waterjet, while fixing the jet power, increases the jet’s power density and thus the cutting speed may increase. This was observed for steel, aluminum, and stone cutting. It was also observed that the kerf taper is less for higher pressure jets. Increasing the pressure while keeping the jet diameter fixed will increase both the power and the power density. This will result in increased cutting speed and less taper. The operating cost of the abrasive waterjets process consists mainly of the costs of abrasives, nozzle wear, utility, and maintenance of equipment. The cost per unit length of material (specific cost) is determined based on the cutting speed. It was found that the main advantage of increasing pressure is increasing the cutting speed or reducing the abrasive consumption per unit time or unit length of cut. The highest savings are obtained when the speed is maximized by increasing the pressure and the abrasive flow rate. Several study cases were addressed in this paper using assumptions and simple models to generalize the analysis. The analysis indicates that increasing the pressure from $400MPato600MPa$ may result in cost per unit length saving of over 30%.

1.
Hashish
,
M.
,
Steele
,
D. E.
, and
Bothell
,
D. H.
, 1997, “
Machining With Super-Pressure (690-MPa) Waterjets
,”
Int. J. Mach. Tools Manuf.
0890-6955,
37
(
4
),
465
479
.
2.
Hashish
,
M.
, 1999, “
Cutting With Waterjets at 690-MPa
,”
High Pressure Technology
,
E.
Roll
, ed., ASME PVP Vol.
384
, pp.
33
39
.
3.
Raghavan
,
C.
, and
Ting
,
E.
, 1991, “
Hyper Pressure Waterjet Cutting of Thin Sheet Metal
,”
Proceedings of the Sixth American Water Jet Conference
,
Water Jet Technology Association
,
Houston, TX
, pp.
493
504
.
4.
Koerner
,
P.
,
Hiller
,
W.
, and
Werth
,
H.
, 2002, “
Design of Reliable Pressure Intensifier for Waterjet Cutting at 4to7kbar
Proceedings of the 16Th International on Water Jetting Conference
,
BHR Group
,
Aix-en-Provence, France
Oct. 16–18, pp.
123
132
.
5.
Hashish
,
M.
, “
The Effect of Pressure on the Performance of Abrasive-Waterjet (AWJ) Machining
,”
Symposium on Manufacturing Systems, Manufacturing International ’88
,
ASME
,
Atlanta, GA
, pp.
255
263
.
6.
Hashish
,
M.
, 1857, “
An Improved Model for Erosion By Solid Particle Impact
,”
Proceedings of the Seventh International Conference on Erosion by Liquid and Solid Impact
,
ELSI VII
,
Cambridge, England
, September 1987.
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