An experimental study of drilling small and deep blind holes with an abrasive water jet

Orbanić, H.; Junkar, Mihael

doi:10.1177/095440540421800504

Cited by 22 publications

(11 citation statements)

References 12 publications

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“…Increment in the water pressure increases both the hole depth and the hole diameter. This result is consistent with the result reported by Orbanic and Junkar [14] in drilling blind hole using AWJ for some other materials. The authors presented an exponential relationship between the drilling depth and drilling time as below…”

Section: Awj Hole Drillingsupporting

confidence: 83%

“…Hlavac et al [13] investigated the AWJ trajectory curve inside the kerf and proposed a model that describes the curvature of the jet trajectory inside curve. Orbanic and Junkar [14] conducted an experimental study of drilling small and deep holes with a continuous AWJ and found that when drilling different materials with a continuous jet, the depth and diameter of the hole increase with a power function. However, titanium alloys were not included in their study.…”

Section: Introductionmentioning

confidence: 99%

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An experimental study of abrasive waterjet machining of Ti-6Al-4V

Wang

2015

Int J Adv Manuf Technol

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This paper presents an experimental study on abrasive waterjet (AWJ) machining of the most commonly used titanium alloy, Ti-6Al-4V. Two types of machining operations, i.e. drilling (or piercing) and slotting, were conducted. For the drilling experiments, the influences of water pressure and drilling time were investigated. It was found that both the hole depth and diameter increased as drilling time increased but in a decreasing rate. An increase in the water pressure increased both the hole depth and the hole diameter. For the slot cutting, the influence of water pressure and the traverse speed were investigated. A slower traverse speed resulted in a deeper depth of cut. The kerf showed a taper shape with a wider entry on top, and the width decreased as jet cut into the material. At the bottom of the kerf, a pocket was generated. The variation of the depth of cut became insignificant when the traverse speed was increased.

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Section: Awj Hole Drillingsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

An experimental study of abrasive waterjet machining of Ti-6Al-4V

Wang

2015

Int J Adv Manuf Technol

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“…Equation (2) suggests a linear influence of jet time (t) on the material removal. Previous studies showed that the drilling depth increase is maximum after initiating the water jet (Akkurt, 2009;Bach et al, 2007;Orbanic and Junkar, 2004;Pandey and Panda, 2013;Matthujak et al, 2013), and, after the first few tenths of a second, increases almost linearly until a maximum depth is reached. The linear phase is therefore limited to a specific range of t. The same holds for P and D in their respective ranges.…”

Section: Discussionmentioning

confidence: 99%

“…For P , a minimal threshold needs to be met before bone material is removed, which lies between 30 and 45 MPa depending on the bone tissue and D (Honl et al, 2000a, b;den Dunnen et al, 2013a). The pressure range in which the pressure can be considered to have a linear influence is up to 120 MPa (Mohamed, 2004;Orbanic and Junkar, 2004). Thus, the volume of and velocity of the water is a good measure for the total volume of material removal, but only when no extreme values for D, t and P are used to achieve this volume and velocity of the water.…”

Section: Discussionmentioning

confidence: 99%

The influence of water jet diameter and bone structural properties on the efficiency of pure water jet drilling in porcine bone

Dunnen

Tuijthof

2014

Mech. Sci.

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Abstract. Using water jets in orthopedic surgery to drill holes in bones can be beneficial due to the absence of thermal damage and the always sharp cut. To minimize operating time and the volume of water that is used, the efficiency (volume of removed bone per added volume of water) of the water jet should be maximized. The goal was to study the effect of the open trabecular bone structure on the efficiency for different water jet diameters. 86 holes were drilled in porcine tali and femora submerged in water with nozzles of 0.3, 0.4, 0.5 and 0.6 mm at 70 MPa during 5 s and a standoff distance of 8 mm. MicroCT scans were made to measure the removed bone volume and the bone structural properties Trabecular Spacing (Tb.Sp.), Trabecular Thickness (Tb.Sp.) and Bone Volume Fraction (BV/TV). Pearson's correlation tests (p < 0.05, 95 % confidence interval) were performed for each water jet diameter using the bone structural property as an independent factor and the efficiency as a dependent factor. No significant differences were found between the nozzle diameters in the material removal rates per added volume of water. The efficiency decreased for an increase in Tb.Th. and BV/TV for nozzles of 0.3, 0.4 and 0.5 mm. The 0.6 mm nozzle showed less influence of the Tb.Th. and BV/TV. The Tb.Sp. has no influence on the efficiency of a water jet.The total volume of added water combined with the Tb.Th. or BV/TV is a leading measure for the volume of bone material that is removed, which provides freedom in the development of water jet instruments as the nozzle diameter, pressure and jet time can be chosen in accordance to the maximum operating time requirements or dimensional limitations of a design.

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“…Dalam aplikasi proses pemesinan, Orbanic dan Junkar [4] melakukan studi ekperimental penggunaan partikel abrasive pada water jet untuk proses drilling lubang kecil dan dalam (small and deep hole). Percobaan proses drilling dilakukan pada beberapa material yang berbeda, sedangkan kedalaman dan diameter lubang diamati untuk waktu drilling yang berbeda.…”

Section: Pendahuluanunclassified

Karakteristik Penetrasi dan Laju Pembuangan Material Non Metal pada Proses Drilling dengan Water Jet Machining Sebagai Variasi Stand of Distance

Suhardjono

Pramujati

2010

jtm

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ABSTRAKUntuk penggunaan komersial, WJM membutuhkan pompa tekanan ekstra tinggi dengan daya minimal 300 hp yang akan menaikkan tekanan air hingga 60.000 psi, dimana tekanan sebesar ini akan menghasilkan kecepatan semprotan air hingga 3 Mach (tiga kali kecepatan suara) sehingga dapat memotong material komposit dari serat karbon untuk komponen pesawat tempur anti radar. Namun demikian, penelitian ini hanya mengembangkan sebuah model untuk mempelajari karakteristik proses pemesinan WJM. Model hanya menggunakan pompa dengan daya 3 kW yang menghasilkan tekanan air sebesar 150 bar (2175 psi). Sebuah batu bata merah dipilih untuk dicoba, karena material ini dapat diukur responnya, yaitu kedalaman penetrasi, diameter lubang dan laju pembuangan material, oleh karena itu batu bata merah ini mempunyai karakteristik yang paling baik untuk mempelajari proses drilling pada WJM. Penelitian ini difokuskan pada bagaimana mempelajari pengaruh parameter SOD (stand of distance). SOD didefinisikan sebagai jarak antara ujung nozel dan permukaan benda kerja. Karakteristik yang diamati adalah pengaruh SOD terhadap kedalaman penetrasi, diameter lubang dan laju pembuangan material pada proses drilling dengan WJM. Hasilnya memperlihatkan bahwa pengaruh SOD mempunyai tendensi kurva parabolik tidak hanya terhadap kedalaman penetrasi dan diameter lubang saja, tetapi juga terhadap laju pembuangan material. Untuk proses drilling dengan diameter nozel 1 mm dan durasi waktu 10 detik terjadi kenaikan kedalaman penetrasi dari 34 mm menjadi maksimum 48 mm atau peningkatan 41% untuk kenaikan SOD antara 5 mm dan 15 mm, tatapi untuk SOD antara 15 -35 mm bahkan terjadi penurunan kedalaman penetrasi menjadi 18 mm atau turun 62,5% dari harga maksimum. Kenaikan SOD dari 5 mm menjadi 15 mm menunjukkan peningkatan laju pembuangan material dari 54,5 mm

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An experimental study of drilling small and deep blind holes with an abrasive water jet

Cited by 22 publications

References 12 publications

An experimental study of abrasive waterjet machining of Ti-6Al-4V

An experimental study of abrasive waterjet machining of Ti-6Al-4V

The influence of water jet diameter and bone structural properties on the efficiency of pure water jet drilling in porcine bone

Karakteristik Penetrasi dan Laju Pembuangan Material Non Metal pada Proses Drilling dengan Water Jet Machining Sebagai Variasi Stand of Distance

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