Evolution Regularity of Temperature Filed in Hot Power Backward Spinning for 7075 Cast Aluminium Alloy Tube

2013 ◽  
Vol 774-776 ◽  
pp. 1170-1173 ◽  
Author(s):  
R.Y. Zhang ◽  
S.J. Tu ◽  
G.Y. Zhao ◽  
J. Wang ◽  
Z.H. Guo
Keyword(s):  
Aluminium Alloy ◽  
Internal Surface ◽  
Fe Model ◽  
Outer Face ◽  
Key Factors ◽  
Ring Spinning ◽  
Alloy Tube ◽  
Temperature Filed ◽  
Spinning Process ◽  
Lock Ring

The spinning temperature is one of key factors affected the uneven deformation during the hot power backward spinning for brittle material tubes, such as cast 7075 aluminium alloy tube. To analyze the evolution regularity of temperature filed in the spinning process, a 3D thermo-mechanical FE model of the process is developed under ABAQUS/Explicit environment. Then, the evolution of temperature filed during the process is analyzed based on the FE model. The results show that: The contact areas temperatures between lock ring, spinning rollers and tube decrease sharply during the initial spinning stage. The high temperature region is transferred from unformed zone of the tube to the contact area between spinning roller and tube. In the spinning zone, the temperature of internal surface of the tube is apparently higher than that of outer face.

Study on Electromagnetic Incremental Aluminium Alloy Tube Bulging with Casting Pipe

2017 ◽  
Vol 730 ◽  
pp. 321-326 ◽  
Author(s):  
Yue Ting Zhu ◽  
Jian Hua Mo
Keyword(s):  
Aluminium Alloy ◽  
Structural Model ◽  
Tensile Force ◽  
Internal Surface ◽  
Straight Tube ◽  
Corrosion Resistant ◽  
Electromagnetic Model ◽  
Alloy Tube ◽  
Simulation Parameters ◽  
Tube Bulging

A new method, electromagnetic incremental tube bulging with casting pipe, has been developed to manufacture corrosion resistant bi-metal pipeline as bulging aluminium alloy tube stuck to the internal surface of casting pipe. By formulating simulation parameters, electromagnetic model and structural model to do numerical simulation. The bulging tube is more homogeneous and closer to a long-straight tube when setting a casting pipe outside the aluminium pipe. Simulation results match well with the experiment. A solenoid coil discharges at different places inside the aluminium alloy tube with casting pipe a few millimetres outside the aluminium alloy tube. The aluminium alloy tube impacts on the internal surface of casting pipe instantaneously under the repulsive electromagnetic forces. The aluminium alloy tube can not be peeled off the casting pipe when tensile force reaches to 1kN. The result demonstrates that it is feasible to produce corrosion resistant bimetallic fluid pipe using electromagnetic incremental forming. The research can provide a certain reference for electromagnetic incremental aluminium alloy tube bulging.

scholarly journals Mathematical Modeling of Dynamic Yarn Path Considering the Balloon Control Ring and Yarn Elasticity in the Ring Spinning Process Based on the Superconducting Bearing Twisting Element

2018 ◽  
Vol 26 (5(131)) ◽  
pp. 32-40 ◽  
Author(s):  
Mahmud Hossain ◽  
Christian Telke ◽  
Anwar Abdkader ◽  
Maria Sparing ◽  
Tilo Espenhahn ◽  
...  
Keyword(s):  
Magnetic Bearing ◽  
Spindle Speed ◽  
Frictional Heat ◽  
Ring Spinning ◽  
German Research Foundation ◽  
Yarn Tension ◽  
Tension Distribution ◽  
Spinning Process ◽  
Fundamental Research ◽  
Superconducting Magnetic Bearing

The productivity of the conventional ring spinning process is currently limited by the frictional heat that occurs in the ring/traveler twisting system. In the framework of a fundamental research project from the German Research Foundation (DFG), the levitation principle of superconducting magnetic bearing (SMB) was implemented as a twisting element in order to eliminate the frictional problem and thus aim, at least, to double the productivity. A mathematical model of the dynamic yarn path has already been presented considering the friction free SMB system up to an angular spindle speed of 25,000 r.p.m. In this paper, the existing theoretical model, which was developed up to 25,000 r.p.m, was further modified considering the balloon control ring and yarn elasticity at a higher angular spindle speed, such as 50,000 r.p.m. The model was solved numerically using the RUNGE-KUTTA method. With this model, it is possible to estimate the yarn tension distribution and balloon form considering the above-mentioned parameters. The model established was further validated by comparing the yarn tension and balloon forms predicted with measured ones up to an angular spindle speed of 15,000 r.p.m in a ring spinning tester based on superconducting magnetic bearing.

Reducing Yarn Hairiness in a Modified Ring Spinning Yarn Path by Various Offsets

2011 ◽  
Vol 331 ◽  
pp. 493-497
Author(s):  
Xu Zhong Su ◽  
Wei Dong Gao ◽  
Ting Ting Wu ◽  
Xin Jin Liu ◽  
Yun Zhang
Keyword(s):  
Critical Region ◽  
Breaking Force ◽  
Ring Spinning ◽  
Fiber Tension ◽  
Yarn Properties ◽  
Spun Yarns ◽  
Spinning Process ◽  
Spinning Triangle ◽  
Yarn Hairiness ◽  
The Right

Spinning triangle is a critical region in the spinning process of yarn. Its geometry influences the distribution of fiber tension in the spinning triangle and the properties of spun yarns, such as the yarn breakage and hairiness. In this paper, the relationships between the spinning angle and yarn properties especially the yarn hairiness were investigated under various horizontal offsets. The properties of spun yarns produced by the modified system were evaluated and analyzed. Both left diagonal and right diagonal yarn arrangements were examined. The results indicate that the right diagonal yarn path leads to reduce yarn hairiness but the left diagonal yarn path leads to increase yarn hairiness; the breaking force of yarn changes little; yarn evenness deteriorates slightly with the changes of offset.

Spinning Process and Mechanical Properties Analysis of PTT Filament Core Spun Yarn

2011 ◽  
Vol 239-242 ◽  
pp. 1207-1210
Author(s):  
Yuan Xue ◽  
En Long Yang
Keyword(s):  
Mechanical Properties ◽  
Mechanical Property ◽  
Elastic Recovery ◽  
Staple Fiber ◽  
Ring Spinning ◽  
The Core ◽  
Outer Sheath ◽  
Spun Yarn ◽  
Two Component ◽  
Spinning Process

The two component filament/staple fiber core-spun yarn is spun on FA506 ring spinning frame with PTT filament as interlaced yarn and Tencel staple fiber as outer sheath. The spinning process and process parameters were analyzed. The morphology, mechanical property and wear-resisting property of two component core-spun yarn were tested. Results indicate that elastic recovery rate of core-spun is up to 90.6%; broken strength is up to 20 cN/tex after boiling water treatment. The core-spun yarn can be used as a new kind of knitting yarn for sweater.

Development of Failure Criteria for Predicting Tearing of Wrinkled Pipe

2010 ◽  
Author(s):  
Arman Uddin Ahmed ◽  
J. J. Roger Cheng ◽  
Joe Zhou
Keyword(s):  
Equivalent Plastic Strain ◽  
Failure Criteria ◽  
Numerical Analyses ◽  
Fe Model ◽  
Load History ◽  
Key Factors ◽  
Cross Sectional ◽  
Damage Initiation ◽  
Scale Test ◽  
Strain Reversal

Onshore steel pipelines, particularly buried in cold region, often subjected to extreme geo-environmental conditions, where significant inelastic deformation may occur resulting in localized wrinkles. Under continued deformation, there is a possibility of excessive cross-sectional deformation at wrinkle locations, eventually leading to fracture or damage in the pipe wall. A recent field fracture and failed laboratory specimens under monotonic load history address the necessity of conducting a comprehensive research program to better understand this unique failure mode. Initial results have indicated that even under monotonic loading, significant strain reversals can occur at sharp fold of the wrinkle. These strain reversals were identified as one of the key factors to trigger this unique failure mechanism. This paper addresses the development of failure criteria used in the finite element (FE) model of plain pipes subjected to sustained monotonic axial and bending deformation with or without internal pressure. In conjunction with the strain reversal criterion, the critical equivalent plastic strain was used as the fracture or damage initiation limit in the numerical analyses. Results obtained from the full-scale test of an NPS16 pipe were used to calibrate the FE model. Results obtained from the numerical analyses have shown that the proposed criteria predict the onset of fracture at sharp fold of the wrinkle with reasonable accuracy.

Analysis of Process and Properties of Stainless Steel Filament Wrapped Yarn Based on Multi-Axial Ring Spinning

2011 ◽  
Vol 332-334 ◽  
pp. 743-746
Author(s):  
Cheng Liang Deng ◽  
Zhao Qun Du ◽  
Wei Dong Yu
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Process Optimization ◽  
Steel Wire ◽  
Ring Spinning ◽  
Excellent Performance ◽  
The Core ◽  
Axial Ring ◽  
Spinning Process ◽  
Core Yarn

A new spinning method was presented to spin three-axial stainless steel filament wrapped yarn by modified ring-spinning, where the stainless steel filament was set as the core yarn and the nylon filament for decoration wrapping the stainless steel filament in the fields of the fabric for Shielding application. A set of process parameters was obtained by the ring spinning frame improvement and spinning process optimization, which realized to spin nylon filament wrapped stainless steel filament yarn. Moreover, the structure, and tensile mechanical properties were measured on the wrapped yarns. The results show that the process can spin stainless steel wire wrapped yarn and acquire the excellent performance of the yarn.

scholarly journals Hot gas bulging of sealed aluminium alloy tube using resistance heating

2014 ◽  
Vol 1 ◽  
pp. 5 ◽  
Author(s):  
Tomoyoshi Maeno ◽  
Ken-ichiro Mori ◽  
Kouji Fujimoto
Keyword(s):  
Aluminium Alloy ◽  
Resistance Heating ◽  
Hot Gas ◽  
Alloy Tube

scholarly journals Bursting Prediction of Hydroforming Aluminium Alloy Tube based on Gurson-Tvergaard-Needleman Damage Model

2014 ◽  
Vol 81 ◽  
pp. 2211-2216 ◽  
Author(s):  
Buang Teng ◽  
Weinian Wang ◽  
Yinquan Liu ◽  
Shijian Yuan
Keyword(s):  
Aluminium Alloy ◽  
Damage Model ◽  
Alloy Tube

Warm Hydroforming Process with Non-Uniform Heating for AZ31 Magnesium Alloy Tube

2010 ◽  
Vol 654-656 ◽  
pp. 739-742 ◽  
Author(s):  
Kenichi Manabe ◽  
Toshiji Morishima ◽  
Yu Ogawa ◽  
Kazuo Tada ◽  
Tsutomu Murai ◽  
...  
Keyword(s):  
Finite Element ◽  
Temperature Distribution ◽  
Magnesium Alloy ◽  
Tube Hydroforming ◽  
Az31 Magnesium Alloy ◽  
Fe Model ◽  
Uniform Heating ◽  
Forming Process ◽  
Alloy Tube ◽  
Warm Hydroforming

In this study, non-uniform heating approach in warm T-joint forming process is attempted for the AZ31 magnesium alloy tube. For this purpose, finite element simulation is performed to analyze the appropriate temperature distribution. The validity of the finite element(FE) model of T-joint tube hydroforming(THF) is verified by comparing the FE simulation and experimental results. Using this FE model, appropriate temperature distribution was suggested. In addition, it was showed that the wall thickness could be more uniform by optimizing the temperature condition.

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