Measurement of the Impact Force and Pressure of Water Jets under the Influence of Jet Break‐up

Fuchs, Enrico; Köhler, Hannes; Majschak, Jens‐Peter

doi:10.1002/cite.201800077

Cited by 11 publications

(4 citation statements)

References 18 publications

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“…This was partly inspired by the research activities aimed at measuring the single-axis force generated by impacts of the pure water jets [51]. These measurements were used in particular to determine the jet diameter [52], the pulsation [53] and the jet breakup [54] of the pure water flows. Some basic relations between trends of the single-axis forces and the AWJ characteristics were presented in Reference [55].…”

Section: Introductionmentioning

confidence: 99%

Abrasive Waterjet (AWJ) Forces—Potential Indicators of Machining Quality

et al. 2021

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The necessity of monitoring the abrasive waterjet (AWJ) processes increases with the spreading of this tool into the machining processes. The forces produced on the workpiece during the abrasive waterjet machining can yield some valuable information. Therefore, a special waterjet-force measuring device designed and produced in the past has been used for the presented research. It was tested during the AWJ cutting processes, because they are the most common and the best described up-to-date AWJ applications. Deep studies of both the cutting process and the respective force signals led to the decision that the most appropriate indication factor is the tangential-to-normal force ratio (TNR). Three theorems concerning the TNR were formulated and investigated. The first theorem states that the TNR strongly depends on the actual-to-limit traverse speed ratio. The second theorem claims that the TNR relates to the cutting-to-deformation wear ratio inside the kerf. The third theorem states that the TNR value changes when the cutting head and the respective jet axis are tilted so that a part of the jet velocity vector projects into the traverse speed direction. It is assumed that the cutting-to-deformation wear ratio increases in a certain range of tilting angles of the cutting head. This theorem is supported by measured data and can be utilized in practice for the development of a new method for the monitoring of the abrasive waterjet cutting operations. Comparing the tilted and the non-tilted jet, we detected the increase of the TNR average value from 1.28 ± 0.16 (determined for the declination angle 20° and the respective tilting angle 10°) up to 2.02 ± 0.25 (for the declination angle 30° and the respective tilting angle of 15°). This finding supports the previously predicted and published assumptions that the tilting of the cutting head enables an increase of the cutting wear mode inside the forming kerf, making the process more efficient.

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Section: Introductionmentioning

confidence: 99%

Abrasive Waterjet (AWJ) Forces—Potential Indicators of Machining Quality

et al. 2021

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“…The model is verified by the test system, while the impact force requires further calculation. It is noteworthy that Enrico Fuchs 39 derived the formula for the impact force (eq. 27).…”

Section: Experimental Validationmentioning

confidence: 99%

Effects of pulsating fluid at nozzle inlet on the output characteristics of common and self‐excited oscillation nozzle

Feng

Wang

Kong

2022

Energy Science & Engineering

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High-speed water jets are key technologies for increased production efficiency in oil drilling, and high-speed self-excited oscillating pulsed water jets (SEOPWs) offer many advantages compared to continuous jets for most industrial applications. Therefore, many studies have focused on this topic.However, the current studies on hydraulic pulsed jets have rarely extended to integrated modeling of the high-speed water jet transmission process. To better apply the SEOPWs, based on fluid mechanics, the theoretical model of the plunger pump-pipeline-nozzle is established, and the sensitivity of different nozzles on the pulsating fluid is studied in the time domain.Furthermore, the vibration characteristics of the nozzle are further investigated in the frequency domain. The results show that the common nozzle has an enlarged role in the pressure amplitude, the Helmholtz nozzle enlarges the pressure peak and amplitude, and the amplification is more obvious with the speedy growth on the plunger pump. However, as the pipeline becomes longer, the difference between the pressure of the inlet and outlet does not change. Therefore, the nozzle is more sensitive to the change in the plunger pump speed. In the frequency domain, the secondary frequency peak for the Helmholtz nozzle is 1.26 times larger than the interference frequency, while it is 1.08 times for the common nozzle. Helmholtz nozzles tend to produce stronger natural vibrations than common nozzles. By comparing the impact force, the experimental results show good agreement with the simulated results. The study provides a theoretical basis for water jet-assisted drilling in deep wells and lays the foundation for the better application of self-oscillating impact drilling tools.

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“…Another presented force measurement investigation was aimed at studying the mixing processes [ 24 ]. The more recent use of waterjet force measurements is focussed on hand tools [ 25 ], impact force at high pressures [ 26 ] and the impact of the waterjet structure on forces [ 27 , 28 ]. AWJ force measurements are once again coming to the fore [ 29 , 30 ], especially in connection with applications on new materials.…”

Section: Introductionmentioning

confidence: 99%

Abrasive Waterjet (AWJ) Forces—Indicator of Cutting System Malfunction

et al. 2021

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Measurements enabling the online monitoring of the abrasive waterjet (AWJ) cutting process are still under development. This paper presents an experimental method which can be applicable for the evaluation of the AWJ cutting quality through the measurement of forces during the cutting process. The force measuring device developed and patented by our team has been used for measurement on several metal materials. The results show the dependence of the cutting to deformation force ratio on the relative traverse speed. Thus, the force data may help with a better understanding the interaction between the abrasive jet and the material, simultaneously impacting the improvement of both the theoretical and empirical models. The advanced models could substantially improve the selection of suitable parameters for AWJ cutting, milling or turning with the desired quality of product at the end of the process. Nevertheless, it is also presented that force measurements may detect some undesired effects, e.g., not fully penetrated material and/or some product distortions. In the case of a proper designing of the measuring device, the force measurement can be applied in the online monitoring of the cutting process and its continuous control.

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Measurement of the Impact Force and Pressure of Water Jets under the Influence of Jet Break‐up

Cited by 11 publications

References 18 publications

Abrasive Waterjet (AWJ) Forces—Potential Indicators of Machining Quality

Abrasive Waterjet (AWJ) Forces—Potential Indicators of Machining Quality

Effects of pulsating fluid at nozzle inlet on the output characteristics of common and self‐excited oscillation nozzle

Abrasive Waterjet (AWJ) Forces—Indicator of Cutting System Malfunction

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