Research on Effects of Accuracy in Variable Loading on the High-Pressure Water Jet Incremental Forming

2013 ◽  
Vol 774-776 ◽  
pp. 1021-1025 ◽  
Author(s):  
Ling Yun Zhang ◽  
Li Nie
Keyword(s):  
Finite Element ◽  
High Pressure ◽  
Finite Element Simulation ◽  
Incremental Forming ◽  
Water Pressure ◽  
Water Jet ◽  
Layered Manufacturing ◽  
Element Simulation ◽  
Pressure Water ◽  
High Pressure Water Jet

High-pressure Water Jet Increment Sheet Metal Forming adopt the idea of layered manufacturing to scatter a complex three-dimension shape to many 2-dimension layers along z axis, and then the water jet machine partially on these layers. We did a research on that the distance from square processing trajectory to center and the water pressure affect the limits of forming height by finite element simulation of high-pressure water jet box-shape piece incremental forming with the thought of layered manufacturing. Based on this, puts forward a new method of different 2-dimension layers is loaded on different water pressure to improve water jet incremental forming accuracy. This method was proved feasibility by finite element simulation.

Research on Hole Making Mechanism of High Pressure Hydraulic Perforation

2014 ◽  
Vol 590 ◽  
pp. 96-100 ◽  
Author(s):  
Hai Cheng Li ◽  
Xu Jing Zhang ◽  
Fu Min Liang
Keyword(s):  
Finite Element ◽  
High Pressure ◽  
Stress Distribution ◽  
Tensile Stress ◽  
Water Jet ◽  
Rock Fragmentation ◽  
Rock Stress ◽  
Element Simulation ◽  
Pressure Water ◽  
High Pressure Water Jet

In this paper, we integrated use hydraulics, seepage flow mechanics, rock mechanics, and finite element simulation analysis and other methods to study the rock fragmentation mechanism of high pressure water jet. We make tensile stress - crack expansion comprehensive rock fragmentation model for the screw drilling of high pressure water jet. We make finite element simulation according to the mechanism of integrated model of high pressure water jet process, to analysis the internal rock stress distribution and external rock stress distribution of the fluid, and come to the reasonable number of high-pressure water jet nozzle hole. It is verified by the high pressure water jet breaking rock inside experiments of tensile stress - comprehensive rock fragmentation fracture expansion model, summarizes the law of high pressure water jet breaking rock, and we get to know reasonable drilling mode of the high pressure water jet is screw drilling with pitch of 120mm. At present there are two main types of the micro mechanism of the high pressure water jet. One is stress and tensile damage, because of the action produced by stress wave of the high pressure water jet impacting on rock, which mainly makes the tensile failure of rock; another one is crack expansion damage, under the effect of quasi static pressure radiation of water jet, the coupling effect between water shooting jet and rock pore skeleton, which make the rock pore, throat, and micro cracks expanding gradually, eventually the macro damage.

scholarly journals Finite element analysis of nozzle selection based on high pressure water jet technology

2019 ◽  
Vol 267 ◽  
pp. 042053
Author(s):  
Gaofeng Song ◽  
Hongxiang Zheng ◽  
Yining Wang ◽  
Yangyan Zheng ◽  
Yun Zhou ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
High Pressure ◽  
Water Jet ◽  
Element Analysis ◽  
Pressure Water ◽  
High Pressure Water Jet

Detailed Incremental Forming of Steel Beverage Cans by a High-Pressure Water Jet

2007 ◽  
Vol 344 ◽  
pp. 567-574 ◽  
Author(s):  
Wilko C. Emmens
Keyword(s):  
High Pressure ◽  
Incremental Forming ◽  
Water Jet ◽  
Limited Area ◽  
General Terms ◽  
Pressure Water ◽  
High Pressure Water Jet

This paper describes the process of shaping fully formed beer & beverage cans with a rotating high-pressure water jet. In detail the paper discusses situations where forming is restricted to a limited area by using a special mould. This causes the strain to shift to biaxial causing quite different properties. The process is compared to ‘normal’ incremental forming showing many similarities that are discussed in more general terms and can be summarized into four propositions.

Demonstration Test on Concrete With Epoxy Resin Coating Using Ultra-High Pressure Water Jet Decontamination Technology

2013 ◽  
Author(s):  
Akihiro Tagawa ◽  
Masashi Tezuka ◽  
Yoshihiro Terakura ◽  
Masayuki Naitou ◽  
Kenji Miyazima
Keyword(s):  
High Pressure ◽  
Nuclear Power ◽  
Power Plants ◽  
Water Pressure ◽  
Decontamination Factor ◽  
Water Jet ◽  
Ultra High Pressure ◽  
Pressure Water ◽  
High Pressure Water Jet ◽  
The Impact

It is one of the most urgent issues to remediate the nuclear power plants contaminated by radioactive materials discharged following the accident at the TEPCO’s Fukushima Daiichi NPS. Concrete walls of nuclear power plants in Japan are coated an epoxy resin coating for easily performing decontamination. We experimented a cutting test in Fugen Decommissioning Engineering Center using maximum 280MPa pressure and 30L/min water quantity, ultra-high pressure water jet system and 40m3/min air quantity vacuum system. We are conducting a study of decontamination technology in environmental pollution using this decontamination system. This decontamination system has achieved a decontamination factor 10 to 100. In environment experiments, we achieved more than 10 decontamination factor in water pressure of more than 150MPa. Thus, we have confirmed the change in a cutting ability by changing parameters. Parameters are the water pressure, the water quantity and air quantity. The impact force for water jet is a function that contains the test parameters. We have considered it using this function. The results of the test showed that there is a correlation between the impact force for water jet and a cutting capability. This decontamination technology can decontaminate radioactive material of the surface adhesion contamination and reduce the amount of waste generated for a thin cutting. In addition, we have experimented that the water can be recycled by chemical precipitation. After we experimented flocculation test using aluminum sulfate and zeolite flocculant, we have confirmed that it. can clean water up to the level of suspended solids 5mg/L, in turbid water using zeolite flocculant. This suspended solids concentration can be passed to the water processing system in nuclear power plant. From the test results, we found that ultra-high pressure water jet decontamination technology has a possibility that it can be used for decontamination of Fukushima Daiichi nuclear power plant.

scholarly journals Analysis on the Shape and Impact Pressure of the High-Pressure Water Jet during the Hydraulic Flushing Cavity Technique

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Shouqing Lu ◽  
Chengfeng Wang ◽  
Wei Wang ◽  
Mingjie Li ◽  
Dongti Zhang
Keyword(s):  
High Pressure ◽  
Rotation Speed ◽  
Water Pressure ◽  
Water Jet ◽  
Impact Pressure ◽  
Coal Seams ◽  
Soft Coal ◽  
Pressure Water ◽  
High Pressure Water Jet ◽  
The Impact

A large proportion of minable coal seams in China belong to low-permeability soft coal seams. Such coal seams suffer serious coal and gas outburst hazards and endure a high incidence of major disasters in coal mines. The adoption of the high-pressure water jet (HPWJ) hydraulic flushing cavity can effectively promote the gas drainage efficiency and volume and eliminate the hidden danger of gas disasters. Nevertheless, the shape and impact pressure of rotating HPWJ are rarely researched. In this study, on the basis of the numerical simulation, the axial and radial stress distributions of HPWJ and the energy-gathering effect of a conical-cylindrical combined nozzle were analyzed. It is concluded that the submerged condition will accelerate the attenuation of jet velocity and reduce the impact strength of the jet. The jet diffusion angle grows with the increases in the nozzle diameter and water pressure, and 24° is the optimal contraction angle. Finally, the influences of factors such as the rotation speed on the shape and impact pressure of HPWJ were explored, and the results show that the rotation speed should be controlled within 90 r/min. The research findings lay the foundation of the study on the mechanism of coal crushing by HPWJ and provide technical support for the research and development of drilling and flushing integrated equipment.

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
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