Micro-Machining of Channels using a High Pressure Abrasive Slurry Jet Machine (HASJM)

Haghbin, Naser; Ahmadzadeh, Farbod; Spelt, J.K.; Papini, M.

doi:10.3850/978-981-09-4609-8_110

Cited by 3 publications

(4 citation statements)

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“…11b) with a depth of d=250 μm made by both machining methods at V t =1000 mm/min, the W a and R a in HASJM (W a = 6.9 μm and R a =1.1 μm) were, respectively, 51 and 15 % less than in AWJM (W a =14.1 μm and R a =1.3 μm). This is consistent with the previous study by Haghbin et al [11].…”

Section: Micro-machining Of Multi-pass Channelssupporting

confidence: 83%

“…The system was used to machine micro-channels over a wide range of aspect ratios (depth/width), and the system process parameters such as pressure, traverse velocity, standoff distance, and slurry flow rate were optimized for micro-machining purposes. A preliminary investigation by Haghbin et al [11] showed that this HASJM system produced channels with centreline roughness (R a =1.35 μm) and waviness (W a =1.93 μm) that were, respectively, 19 and 44 % smaller than those produced with conventional abrasive water jet micro-machining (AWJM). This was attributed to a more consistent abrasive flow rate and the elimination of air bubbles in the erosive jet.…”

Section: Introductionmentioning

confidence: 99%

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High pressure abrasive slurry jet micro-machining using slurry entrainment

Haghbin

Ahmadzadeh

Spelt

et al. 2015

Int J Adv Manuf Technol

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A novel high-pressure (water pump pressure up to 250 MPa) abrasive slurry micro-machining (HASJM) system was introduced. By feeding a premixed slurry into the mixing chamber of a water jet machine with a micro-nozzle (mixing tube diameter of 254 μm), premature erosion of system components was avoided. An optimum erosion rate of 2.7 mg/g was reached when machining Al6061-T6 with a slurry of 25 μm aluminum oxide particles under conditions (slurry flow rate=200 g/min and water pump pressure=235 MPa) near to those which theoretically maximized momentum transfer between the inlet slurry and the water jet entering the mixing chamber from the orifice. It was found that when the standoff distance increased tenfold, the erosion rate almost doubled in glass, but decreased by 50 % in Al6061-T6, due to differences in the erosion at the jet periphery for the two materials. For aspect ratios greater than 0.9, high-quality symmetric channels with a centerline waviness below 6.9 μm and a centerline roughness below 1.1 μm could be produced using a single pass at a low traverse velocity of 40 mm/min. The use of multiple machining passes at a relatively high traverse speed (~1000 mm/min) was found to produce asymmetric channels when the aspect ratio was greater than 0.9, owing to jet deflection from steps formed on the cutting front. Channels produced by micro-milling Al6061-T6 and glass had a 50 % lower centerline waviness and 16 % lower centerline roughness than those made with the conventional abrasive water jet in which air and abrasive entered the mixing chamber.

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Section: Micro-machining Of Multi-pass Channelssupporting

confidence: 83%

Section: Introductionmentioning

confidence: 99%

High pressure abrasive slurry jet micro-machining using slurry entrainment

Haghbin

Ahmadzadeh

Spelt

et al. 2015

Int J Adv Manuf Technol

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“…There are many parameters that affect the surface roughness of pre-mixed abrasive water jet cutting, which are divided into jet system parameters (number of 1-10) and mechanical system parameters (number of [11][12][13][14][15][16][17][18]. Combining the self built 5-degree of freedom pre-mixed abrasive water jet cutting system, 18 commonly used parameters were selected for analysis, as shown in Table 1.…”

Section: Impact Parametersmentioning

confidence: 99%

“…Abrasive water jet is divided into post-mixed abrasive water jet and pre-mixed abrasive water jet [8][9]. Compared with the post-mixed abrasive water jet, the mixing mechanism of the abrasive particles and water medium of the pre-mixed abrasive water jet is improved, the abrasive concentration distribution is more uniform, the energy transmission efficiency is higher, the abrasive particle speed is larger, and the cutting ability is higher [10][11][12].…”

mentioning

confidence: 99%

Experimental study on cutting carbon steel with pre-mixed abrasive water jet and construction of a mathematical model for predicting cutting surface roughness

Zhang,

Wang,

Xie

et al. 2023

Preprint

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Realizing precision machining of pre-mixed abrasive water jet is an important issue that needs to be solved, and physical model analysis, experimental research, establishment of predictive mathematical models, and experimental verification are relatively mature solutions. Based on dimensional analysis, the key influencing parameters on the cutting surface roughness Ra of pre-mixed abrasive water jet cutting were determined: working pressure of water jet P, feed rate v, target distance h, and nozzle outlet diameter d. A full factor cutting experiment L81 (34) was developed for Q235 carbon structural steel based on four key influencing parameters, and the cutting experiment was completed using a pre-mixed abrasive water jet cutting system. Based on the analysis of polar variance, the significance relationships of four key influencing parameters were obtained, with d>v>P>h. Analyze the experimental data to obtain the optimal parameter combination: P=28 MPa, v=50 mm/min, h=4 mm, d=1.14 mm. The minimum Ra under this parameter combination is 0.760 µm. Based on the multivariate nonlinear regression analysis method, a mathematical model for predicting the cutting surface roughness of Q235 carbon structural steel was constructed, with an average relative error of 3.633%. The mathematical model for predicting the cutting surface roughness of Q235 carbon structural steel constructed in this study has good reliability and has a good predictive effect on the cutting surface roughness.

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