An Experimental Study on 3D Forming of Sheet Metal Using Plasma Arc

For the development of flexible forming using plasma arc (FFUPA), it is extremely necessary to investigate the forming rules of curvilinear scanning and multipath combined scanning. In this paper, the difference between circular scanning and linear scanning and the influence of sheet metal geometry on forming effect have been discussed. In the experiments, circle, ring and rectangle mild steel sheets with thickness of 0.8mm are taken as workpieces and the experimental results show that nonlinear prolonged surface can be obtained by curvilinear scanning and there exists the obvious difference between circular scanning and linear scanning. Afterwards, the reason of the difference mentioned above is concisely analyzed. Finally, some suggestions are presented for the future investigation.

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Technology and Study on Circular Arc Flexible Forming of Sheet Metal Using Plasma Arc

Materials Science Forum ◽

10.4028/www.scientific.net/msf.532-533.508 ◽

2006 ◽

Vol 532-533 ◽

pp. 508-511 ◽

Cited By ~ 2

Author(s):

Wen Bin Wu ◽

Wen Ji Xu ◽

Zhong Ying Wang ◽

Jin Jin Zhou

Keyword(s):

Numerical Simulation ◽

Sheet Metal ◽

Experimental Results ◽

Plasma Arc ◽

Analysis Software ◽

Flexible Forming ◽

Circular Arc ◽

The Relationship ◽

Fea Analysis ◽

Geometrical Relationship

Circular arc flexible forming of sheet metal using plasma arc can be made by combing V-shape curving, the geometrical relationship between circular arc bending part and V-shape is investigated in this paper. In this thesis, the authors analyzed the relationship between a parameter γ and the degree of circular arc smoothness firstly. A simulation program was programmed using the FEA analysis software ANSYS, and the experiments were done. The results showing, when γ = 0.10.12, the forming circular arc is very smooth. The numerical simulation is right for the experimental results.

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An Experimental Study on the Lateral Impact of Fully Clamped Mild Steel Pipes

Proceedings of the Institution of Mechanical Engineers Part E Journal of Process Mechanical Engineering ◽

10.1243/pime_proc_1992_206_207_02 ◽

1992 ◽

Vol 206 (2) ◽

pp. 111-127 ◽

Cited By ~ 50

Author(s):

N Jones ◽

S E Birch ◽

R S Birch ◽

L Zhu ◽

M Brown

Keyword(s):

Experimental Data ◽

Experimental Study ◽

Mild Steel ◽

Failure Modes ◽

Experimental Results ◽

Lateral Impact ◽

Drop Hammer ◽

Steel Pipes ◽

Scale Range ◽

The Impact

This report presents some experimental data that were recorded from 130 impact tests on mild steel pipes in two drop hammer rigs. The pipes were fully clamped across a span which was ten times the corresponding outside pipe diameters which lie between 22 and 324 mm. All of the pipes except five had wall thicknesses of 2 mm approximately and were impacted laterally by a rigid wedge indenter at the mid span, one-quarter span or near to a support. The impact velocities ranged up to 14 m/s and caused various failure modes. Some comparisons between two sets of experimental results indicate that the laws of geometrically similar scaling are almost satisfied over a scale range of approximately five.

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Experimental Study of Vibrational Acceleration Spread and Comparison Using Three Citrus Canopy Shaker Shaking Tines

Shock and Vibration ◽

10.1155/2017/9827926 ◽

2017 ◽

Vol 2017 ◽

pp. 1-9 ◽

Cited By ~ 2

Author(s):

Tian-Hu Liu ◽

Reza Ehsani ◽

Arash Toudeshki ◽

Xiang-Jun Zou ◽

Hong-Jun Wang

Keyword(s):

Experimental Study ◽

Experimental Results ◽

Average Decrease ◽

Vibrational Acceleration ◽

The Difference ◽

Canopy Shaker

The goal of this article is to experimentally study how the vibrational acceleration spreads along the branch shaken by PVC tine, steel tine, and nylon tine for citrus canopy shaking harvesting and to compare the difference. PVC tine and steel tine have potential to be used as shaking rod for citrus canopy shaking harvesting. Nylon tine is a commonly used shaking rod. A tractor-mounted canopy shaker was developed to do the trial. The shaking frequency was set at 2.5 and 5 Hz. Experimental results showed that the vibrational acceleration at the shaking spot is not the highest. Spreading from shaking spot to the stem, it increases evidently. When spreading from stems of the outside subbranch to stems of the nearest inside subbranch, its average decrease percentage is 42%. The overall vibrational acceleration of shaking at 5 Hz is 1.85 times as high as shaking at 2.5 Hz. The overall vibrational acceleration exerted by straight PVC tine and steel tine is 1.77 and 1.97 times as high as that exerted by straight nylon tine, respectively. It is indicated that replacing nylon tine with steel tine or PVC tine helps remove the fruits inside the canopy. Replacing with steel tine is more effective than with PVC tine.

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An Experimental Study on 3D Forming of Sheet Metal Using Plasma Arc

Materials Science Forum - PRICM-5 ◽

10.4028/0-87849-960-1.3943 ◽

2005 ◽

pp. 3943-3946

Author(s):

Wen Ji Xu ◽

Jian Cheng Fang ◽

F. Liu ◽

Gui Bing Pang

Keyword(s):

Experimental Study ◽

Sheet Metal ◽

Plasma Arc

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A study on mechanical properties after bonded repair of sandwich composite materials

Modern Physics Letters B ◽

10.1142/s0217984920400333 ◽

2020 ◽

Vol 34 (07n09) ◽

pp. 2040033 ◽

Cited By ~ 1

Author(s):

Sunghoon Kim ◽

Jongrok Ha ◽

Seongwon Yoon ◽

Myunghyun Kim

Keyword(s):

Mechanical Properties ◽

Experimental Study ◽

Composite Materials ◽

Recovery Rate ◽

Fatigue Tests ◽

Experimental Results ◽

Sandwich Composite ◽

Bonded Repair ◽

Patch Repairs ◽

The Difference

In this paper, an experimental study was conducted to determine the efficiency of repair methods for sandwich composites used as hull materials in leisure ships. The method was applied to external, scarf, and step patch repairs using an epoxy bond. The load was described in terms of the hogging and sagging moments applied to the hull by waves. Static and fatigue tests were performed to derive the recovery rate of repaired specimens. The experimental results indicated that the recovery rate of specimens with the scarf patch was the highest at 91.80% when the hogging moment was applied. However, the difference in the recovery rate between hogging and sagging moments was the lowest for specimens with the step patch, and the recovery rate was high at 89.96% and 85.15%, respectively.

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Flexible Forming of Sheet Metal Using Plasma Arc

10.1115/imece1999-0759 ◽

1999 ◽

Author(s):

YiWei Chen ◽

PengJiu Li ◽

Alan T. Male ◽

YuMing Zhang

Keyword(s):

Heat Source ◽

Product Development ◽

Rapid Prototyping ◽

Sheet Metal ◽

Lead Time ◽

Experimental System ◽

Plasma Arc ◽

Sheet Metals ◽

Flexible Forming ◽

Energy Beam

Abstract Conventional precision forming of sheet metal requires the use of mechanical tools. However, during product development, different tools may be required to form various shapes, thus requiring significant tool cost and lead time. If a rapid prototyping process were available such that the required shapes can be formed without the need for hard tools, the potential reduction in product development cost and lead time could be quite significant. Moreover, such a process could be used for very short run production where it would be uneconomical to amortize tooling cost over a small number of manufactured pieces. To explore the potential for flexible forming without tools, various researchers have used laser beams as a heat source to form sheet metals, with a significant measure of success. To investigate the use of a more economical and potentially safer heat source, the authors recently established an experimental system to investigate the feasibility of forming sheet metals using a non-transferred arc plasma as the energy beam and CO2 as the cooling jet. Several samples have been formed using the developed experimental system. Experiments have shown that the forming direction, either toward or away from the plasma arc beam, can be completely controlled to allow the formation of complex shapes. It is believed that this provides the basis for a new rapid prototyping process for the forming of sheet metal components.

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Flexible forming of sheet metal using plasma arc

Journal of Materials Processing Technology ◽

10.1016/s0924-0136(01)00765-8 ◽

2001 ◽

Vol 115 (1) ◽

pp. 61-64 ◽

Cited By ~ 9

Author(s):

A.T. Male ◽

P.J. Li ◽

Y.W. Chen ◽

Y.M. Zhang

Keyword(s):

Sheet Metal ◽

Plasma Arc ◽

Flexible Forming

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Joining of Aluminium Alloy and Mild Steel Sheets Using Mechanical Clinching

Materials Science Forum ◽

10.4028/www.scientific.net/msf.561-565.1043 ◽

2007 ◽

Vol 561-565 ◽

pp. 1043-1046 ◽

Cited By ~ 19

Author(s):

Y. Abe ◽

T. Kato ◽

Kenichiro Mori

Keyword(s):

Mild Steel ◽

Aluminium Alloy ◽

Deformation Behaviour ◽

Sheet Thickness ◽

Alloy Sheet ◽

Total Thickness ◽

Steel Sheets ◽

Lower Sheet ◽

Mechanical Clinching ◽

The Difference

The aluminium alloy and mild steel sheets were joined with mechanical clinching. Deforming behaviour of the two sheets during the clinching was observed from finite element simulation and an experiment to avoid defects. The fracture of the upper sheet, necking and separation are caused by the small upper sheet thickness in the thick total thickness, the small lower sheet thickness in the thick total thickness and the small lower sheet thickness, respectively. The joining range for the combination of the upper aluminium alloy sheet of and the lower steel sheet of is larger than that of the reverse combination. The effect of the difference between the flow stresses of the two sheets on the deformation behaviour was examined.

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Research on a New Scanning Process for the Flexible Forming Using Plasma Arc

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.538-541.845 ◽

2012 ◽

Vol 538-541 ◽

pp. 845-850

Author(s):

Qing Tao Li ◽

De Ping Yu ◽

Jin Yao

Keyword(s):

Sheet Metal ◽

Sheet Metal Forming ◽

Metal Forming ◽

Processing Parameters ◽

Plasma Arc ◽

Bending Angle ◽

Flexible Forming ◽

Scanning Process ◽

Optimal Processing ◽

Short Run

Flexible forming using plasma arc (FFUPA) is a newly developed process of sheet metal forming, which can deform the sheet metal without mould and die, and thus is a promising method for rapid prototyping and short-run production. To achieve a large bending angle, it is unavoidable to scan the sheet metal for multiple times. However, the average bending angle reported in literature for each time is limited. To obtain a larger bending angle by each scan, this paper proposes a new scanning process, in which an assistant heat source is placed ahead of the plasma arc. The proposed scanning process has been studied by numerical simulation and optimized for the optimal processing parameters.

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