The Study on Abrasive Water Jet for Predicting the Cutting Performance and Monitoring the Cutting Situation in the Water

2011 ◽  
Vol 133 (6) ◽  
Author(s):  
Yasuyuki Nakamura ◽  
Kazuya Sano ◽  
Yoshitugu Morishita ◽  
Shinichiro Maruyama ◽  
Shinichi Tezuka ◽  
...  
Keyword(s):  
High Pressure ◽  
Water Jet ◽  
The Other ◽  
Cutting Condition ◽  
Visual Methods ◽  
Abrasive Water Jet ◽  
Supply Rate ◽  
Cutting Head ◽  
Conservation Of Momentum ◽  
Pressure Water

The abrasive water jet (AWJ), is to shoot the abrasive mixed with high-pressure water to the material for cutting, can cut most materials, such as metals and concretes in water with long stand-off means the length from the cutting head to the material for cutting. On the other hand, AWJ is required to reduce an amount of the abrasive because it becomes the waste. It is also difficult to monitor the cutting condition by any visual methods such as a TV camera in the water becoming cloudy by both used abrasive and cut metal grit. For solving these issues, some cutting tests were conducted and (1) it was possible to predict an optimal supply rate of abrasive by considering the conservation of momentum between the water jet and the abrasive. (2) It was also possible to judge whether the material could be cut successfully or not by detecting the change in the frequency characteristics of vibration or sound caused during the cutting process.

Assessment of the Applicability of the Abrasive Water Jet Technique for Dismantling the Reactor of Fugen: Studies for Reducing the Usage of Abrasive and for Surveying the Cutting Situation Under the Water

2008 ◽  
Author(s):  
Yasuyuki Nakamura ◽  
Yoshitugu Morishita ◽  
Shinichiro Maruyama ◽  
Shinichi Tezuka ◽  
Daisuke Ogane ◽  
...  
Keyword(s):  
Water Jet ◽  
Cutting Condition ◽  
Visual Methods ◽  
Abrasive Water Jet ◽  
Supply Rate ◽  
Cutting Method ◽  
Conservation Of Momentum ◽  
Narrow Space ◽  
Mechanical Cutting ◽  
Awj Cutting

The reactor of FUGEN NPP consists of many number of double-tube arranging a pressure tube (P/T) and a calandria tube (C/T) coaxially. In the case of dismantling both a P/T and a C/T simultaneously, it is preferable to use the mechanical cutting method because it does not apply the heat to highly activated P/T and C/T, as a result, it would be suppressed to release activated particles into surrounding environment. The method is also required to use a smaller cutting device for permitting the remote control of it in a narrow space, and to have a relatively long standoff for cutting the double-tube simultaneously. The authors chose the abrasive water jet (AWJ) cutting method as one of the mechanical cutting method for dismantling the reactor. The authors have also developed the smaller AWJ cutting device and confirmed that the device is applicable to the cutting of the double-tube. On the other hand, it is an issue to reduce an amount of abrasive because it becomes the secondary radioactive waste after the cutting work. It is also difficult to survey the cutting condition by any visual methods like a TV camera in the water becoming cloudy by both used abrasive and cut metal grit. For solving these issues, the following two studies were conducted. (1) The recycle of used abrasive was examined. And it was also confirmed to be able to predict an optimal supply rate of abrasive by considering the conservation of momentum between the water jet and the abrasive. (2) It was possible to judge whether the material could be cut or not by detecting the change in the frequency characteristics of vibration or sound caused during the cutting process.

scholarly journals Investigation of diagnostic possibilities of the state cutting process of steel with high-pressure abrasive water jet

2018 ◽  
Vol 19 (12) ◽  
pp. 495-499
Author(s):  
Rafał Kudelski ◽  
Halina Nieciąg ◽  
Krzysztof Zagórski
Keyword(s):  
High Pressure ◽  
Data Acquisition ◽  
Water Jet ◽  
The State ◽  
Cutting Process ◽  
Vibration Measurement ◽  
Abrasive Water Jet ◽  
Cutting Head ◽  
Pressure Water ◽  
High Pressure Water Jet

The article presents the application of vibration measurement of the cutting head for the diagnostics of the state of the cutting process with high-pressure water jet. Data acquisition was performed when cutting wedge-shaped samples of S355J2H steel. The recorded signal was analyzed appropriately. In the summary part, conclusions from the research were drawn.

Design of the Circular Cutting Device

2014 ◽  
Vol 556-562 ◽  
pp. 1126-1128
Author(s):  
Chao Kun Wei ◽  
Shan Shan Tang ◽  
Hao Yang
Keyword(s):  
High Pressure ◽  
Water Jet ◽  
Abrasive Water Jet ◽  
Pressure Water ◽  
High Pressure Water Jet

Currently, abrasive water jet technology is widely applied to cutting while it has been difficult in circular cutting, as travel mechanism is not easy to realize or the structure is too complex. To solve this problem, this paper presents a simple circular cutting device for high-pressure water jet technology. The cutting device completes cutting work by rotating clamping devices around the center thimble through electromotor. At the same time,the paper introduces the components of the circular cutting device and analyzes the reliability of the slider part by ANSYS.

The Measurement of the Velocity Outside the High Pressure Water Jet and Abrasive Water Jet Nozzle Based on the Energy Transfer Method

2010 ◽  
Vol 135 ◽  
pp. 361-364 ◽  
Author(s):  
Rong Guo Hou ◽  
C.Z. Huang ◽  
H.T. Zhu ◽  
Z.W. Niu
Keyword(s):  
High Pressure ◽  
Energy Transfer ◽  
Water Jet ◽  
Abrasive Water Jet ◽  
Impact Forces ◽  
Pressure Water ◽  
High Pressure Water Jet ◽  
Transfer Method ◽  
The Impact ◽  
Core Part

The energy transfer method is used to measure the flow velocity of the outside the high pressure water jet (WJ) and Abrasive water jet (AWJ) nozzle. The impact forces of the flow measured by the piezoelectricity ergometer will be transformed to the velocity value, the average velocity of the flow outside the nozzle will be obtained. The result indicates the velocity will reduce along the direction of the flow, and the velocity of the AWJ flow will reduced greatly than the WJ flow, which indicates that the length of the core part of the AWJ flow is shorter than the WJ Flow, the stand-off should be within the 0mm-15mm ranges to gain the most effective machining.

The mechanism and application of high-pressure water jet technology to prevent compound dynamic disaster

2021 ◽  
Vol 14 (13) ◽  
Author(s):  
Zeng-qiang Yang ◽  
Chang Liu ◽  
Feng-shuo Li ◽  
Lin-ming Dou ◽  
Gang-wei Li ◽  
...  
Keyword(s):  
High Pressure ◽  
Water Jet ◽  
Pressure Water ◽  
Dynamic Disaster ◽  
High Pressure Water Jet

Crowning Carrots with a High Pressure Water Jet

1988 ◽  
Vol 4 (4) ◽  
pp. 340-343 ◽  
Author(s):  
John H. Posselius ◽  
Jr.. Glenn T. Conklin
Keyword(s):  
High Pressure ◽  
Water Jet ◽  
Pressure Water ◽  
High Pressure Water Jet
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