Online-monitoring for Abrasive Waterjet Cutting of CFRP via Acoustic Emission: Evaluation of Machining Parameters and Work Piece Quality Due to Burst Analysis

Lissek, Fabian; Kaufeld, Michael; Tegas, Jacqueline; Hloch, Sergej

doi:10.1016/j.proeng.2016.06.640

Cited by 12 publications

(6 citation statements)

References 8 publications

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“…When the material is loaded at or near its yield stress, plastic deformation occurs, which involves the movement of dislocations with atomic planes slip past each other. Such movements release energy in the form of acoustic emission which travels through the object and can be picked up by an AE sensor [27,41].…”

Section: Hole Diametermentioning

confidence: 99%

“…Due to the process complexity and variety of work materials, monitoring the AWJ machining process and the jet penetration depth has become increasingly important as a possible process supervision solution. Some attempts of using acoustic emission (AE) sensors to monitor the AWJ machining process have been reported [21,22]. Acoustic emission is a transient elastic stress wave emitted and propagated inside a material, due to the sudden release of stored strain energy in the material, such as the occurrence of fracture, plastic deformation, crack formation, and phase transform.…”

Section: Introductionmentioning

confidence: 99%

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Monitoring the abrasive waterjet drilling of Inconel 718 and steel: a comparative study

2020

Int J Adv Manuf Technol

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This paper presents an experimental study on abrasive waterjet (AWJ) drilling of Inconel 718 and AISI 1040 steel, with an aim to understand the AWJ hole drilling performance and to investigate the process monitoring strategy by using acoustic emission (AE). In the experiments, pressure levels were set from 200-350 MPa at intervals of 50 MPa, and drilling time between 5-30 s at intervals of 5 s. It is found that the hole depth increases along with the drilling time at a slowing down penetration rate. A higher pressure results in a higher penetration rate. While there exists a direct influence of the material property on the drilling efficiency, it has limited significance with regards to the diameter of the hole produced. AE-RMS signal is demonstrated to be able to reflect the decreasing trend of the penetration rate and the influence of the pressure. A strong correlation between the penetration rate and AE-RMS values in AWJ hole drilling is shown through correlation analysis. The AE-RMS is also substantially affected by the material properties. A discrepancy of the AE-RMS under similar condition may suggest an anomaly in this cutting run.

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Section: Hole Diametermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Monitoring the abrasive waterjet drilling of Inconel 718 and steel: a comparative study

2020

Int J Adv Manuf Technol

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“…On the other hand, the Counts statistic was defined by Lopes et al [9] as the number of times that the signal crosses a threshold per unit of time. The Counts statistic, calculated from the AE signal, has often been implemented in scientific works with different purposes, such as the location and measurement of acoustic emission events in snow blocks before their fracture [52] and the on-line monitoring of abrasive water cutting processes [53].…”

Section: Rms and Counts In Ae Signal Processingmentioning

confidence: 99%

A Novel Ultrasound Technique Based on Piezoelectric Diaphragms Applied to Material Removal Monitoring in the Grinding Process

Alexandre

Aguiar

Götz

et al. 2019

Sensors

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The interest of the scientific community for ultrasound techniques has increased in recent years due to its wide range of applications. A continuous effort of researchers and industries has been made in order to improve and increase the applicability of non-destructive evaluations (NDE). In this context, the monitoring of manufacturing processes, such as the grinding process, arises. This work proposes a novel technique of ultrasound monitoring (chirp-through-transmission) through low-cost piezoelectric diaphragms and digital signal processing. The proposed technique was applied to the monitoring of material removal during the grinding process. The technique is based on changes in ultrasonic waves when propagated through the material under study, with the difference that this technique does not use traditional parameters of ultrasonic techniques but digital signal processing (RMS and Counts). Furthermore, the novelty of the proposed technique is also the use of low-cost piezoelectric diaphragms in the emission and reception of ultrasonic waves, enabling the implementation of a low-cost monitoring system. The results show that the monitoring technique proposed in this work, when used in conjunction with the frequency band selection, is sensitive to the material removal in the grinding process and therefore presents an advance for monitoring the grinding processes.

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“…During the experiment the feed rate, type of bullet holes and other support technologies were changed. [4] …”

Section: The Experimentsmentioning

confidence: 99%

“…Therefore it appeared that the best and in practice the most used type of shot for thick walled sheet metal is the circular one. [4] For samples 4 to 8, the circular type of shot was kept. The Progress Jet function was also enabled and DRC controlling was turned off.…”

Section: Comparison In Terms Of the Bullet Holementioning

confidence: 99%

Using of Waterjet Technology for Cutting Aluminum Alloy

Kroupa¹,

Daňa²,

Zetek³

2017

DAAAM Proceedings

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This Publication has to be referred as: Kroupa, T[omas]; Dana, M[ilan] & Zetek, M[iroslav] (2017). Using of Waterjet AbstractThis paper presents an analysis of the impact of AWJ Machining on the surface of Aluminium (AlMg3) parts. Samples of Aluminium are subjected to AWJ surface machining. The essence of this cutting method is the grinding of a material by using pressure from a waterjet. The jet is generated in the cutting head and terminates in the nozzle. A range of machining parameters is considered, including feed rate, cut quality, speed, and static shot. These samples are then subject to surface analysis. This analysis allows conclusions to be drawn with regard to optimal machining conditions for cut quality improvement. This experiment provided a practical verification of the theoretical assumption. The practical part with the cut samples should serve mainly to provide a better idea and easier understanding of this technology. Samples which were cut using AWJ were documented and compared.This experiment also shows that it is necessary to pay attention to ensuring the correct cutting parameters for a specific application, because even here can be seen the eternal duel between quantity versus quality.

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Online-monitoring for Abrasive Waterjet Cutting of CFRP via Acoustic Emission: Evaluation of Machining Parameters and Work Piece Quality Due to Burst Analysis

Cited by 12 publications

References 8 publications

Monitoring the abrasive waterjet drilling of Inconel 718 and steel: a comparative study

Monitoring the abrasive waterjet drilling of Inconel 718 and steel: a comparative study

A Novel Ultrasound Technique Based on Piezoelectric Diaphragms Applied to Material Removal Monitoring in the Grinding Process

Using of Waterjet Technology for Cutting Aluminum Alloy

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