scholarly journals Physical and Technical Foundations of the Use of Alternating Free Bending for Producing Long-length Semi-products from Metals and Alloys with Improved Mechanical Properties

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 879 ◽  
Author(s):  
Georgy Raab ◽  
Farid Utyashev ◽  
Rashid Asfandiyarov ◽  
Arseniy Raab ◽  
Denis Aksenov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Strain State ◽  
Type Structure ◽  
Theoretical Justification ◽  
Bending Process ◽  
Continuous Bending ◽  
Gradient Type ◽  
Monotonic Character ◽  
Free Bending ◽  
Complex Methods

In this work, we give a theoretical justification of the non-monotonic character of strain in the process of refinement and formation of a grain-type structure during the deformation processing of low-alloyed copper heat-hardenable alloys. A regularity is revealed, suggesting the alternating behavior of the strain state in the process of the continuous bending of billets. It is found that the continuous free bending process in the conditions of multi-cycle (four cycles) processing increases the strength and produces a gradient-type structure and a gradient of mechanical properties. Using fabrication of the experimental samples of the contact wire as an example, it is shown that the obtained results can serve as a scientific and technical foundation for the development of complex methods for the processing of axis-symmetrical long-length objects from copper heat-hardenable alloys in the form of wires and shaped products with improved mechanical properties, with potential adaptability for manufacturing.

scholarly journals Influence of Continuous Bending Process on Texture Evolution and Mechanical Properties of AZ31 Magnesium Alloy

2017 ◽  
Vol 31 (3) ◽  
pp. 225-233 ◽  
Author(s):  
Ting-Zhuang Han ◽  
Guang-Sheng Huang ◽  
Lun Huang ◽  
Bin Jiang ◽  
Guan-Gang Wang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Texture Evolution ◽  
Az31 Magnesium Alloy ◽  
Bending Process ◽  
Continuous Bending

Bending Process Simulation of a Flat Workpiece with Various Cross-Sectional Mechanical Properties with PAM-STAMP 2G

2016 ◽  
Vol 685 ◽  
pp. 133-136 ◽  
Author(s):  
Fedor Grechnikov ◽  
Yurii Gorshkov ◽  
Yaroslav Erisov
Keyword(s):  
Mechanical Properties ◽  
Heat Affected Zone ◽  
Process Simulation ◽  
Laser Cutting ◽  
Strain State ◽  
Stress Strain ◽  
Cross Sectional ◽  
Stress Strain State ◽  
Bending Process

We have simulated an aluminum workpiece tool bending process with and without consideration of the heat affected zone after laser cutting with PAM-STAMP 2G. To describe the heat affected zone we have used a customized software option for calculating welded materials and dissimilar ones. We have also provided an analysis of the stress-strain state with a different scale of mechanical properties of the material on its “edge” and in the center of the workpiece.

scholarly journals Investigation on the Influence of Weld Position on the Deformation Behavior of Welded Tube During Free Bending Process

2021 ◽  
Author(s):  
Cheng Cheng ◽  
Chao Pan ◽  
Xueshan Bai ◽  
Chunmei Liu ◽  
Xunzhong Guo
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Deformation Behavior ◽  
Weld Zone ◽  
Uniaxial Tensile ◽  
Forming Quality ◽  
Plastic Deformation Behavior ◽  
Bending Process ◽  
Welded Tube ◽  
Free Bending

Abstract The non-uniform distribution of the mechanical properties of welded tube would affect the plastic deformation behavior of tube during the free bending process. To explore the influence of weld position on the forming quality and axis dimensional accuracy of welded tube, the free bending experiment and numerical simulation of welded tube were conducted in this paper. First, the principle of free bending was theoretical deduced and the stress distribution of bent tube was analyzed. Then the hardness test and uniaxial tensile test were conducted to obtain the mechanical properties of weld zone and parent zone of welded tube. The material strength in the weld zone of welded tube is significantly higher than that in the parent zone. Finally, the free bending experiment and numerical simulation with different weld position were carried out, and the influence of weld position on the bending radius, cross-sectional distortion and wall thickness of bent tube was discussed. All these findings advance the insight into the free bending deformation behavior of welded tube and help to improve the forming quality of welded tube and facilitate the application of free bending technology in welded tube.

scholarly journals Enhanced mechanical properties of AZ31 magnesium alloy sheets by continuous bending process after V-bending

2016 ◽  
Vol 26 (1) ◽  
pp. 97-102 ◽  
Author(s):  
Tingzhuang Han ◽  
Guangsheng Huang ◽  
Yougen Wang ◽  
Guangang Wang ◽  
Yanchun Zhao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Az31 Magnesium Alloy ◽  
Bending Process ◽  
Continuous Bending

Experimental Assessment of High Temperature Formability of Boron Steel Sheet Manufactured With a Spring Compound Bending Die

2012 ◽  
Vol 134 (2) ◽  
Author(s):  
Yang Li ◽  
Yong-Phil Jeon ◽  
Chung-Gil Kang
Keyword(s):  
Mechanical Properties ◽  
Heating Temperature ◽  
Boron Steel ◽  
Hot Press ◽  
Forming Process ◽  
Steel Sheets ◽  
Press Forming ◽  
Bending Process ◽  
Tension Testing ◽  
Hot Press Forming

Bending behavior occurs in the hot press forming process, resulting in many cases of failure during forming. To address the problem of cracking and improve the formability and mechanical properties of boron steel sheets in the bending process, an experiment has been carried out by using a spring compound bending die. Also, a comparison has been made between the traditional U-bending die and the spring compound bending die with regard to formability. The influence of the parameters for hot press forming such as the heating temperature, punch speed, and die radii on the mechanical properties and microstructure was analyzed by tension testing and metallographic observations.

Investigation on the influence of mandrel on the forming quality of thin-walled tube during free bending process

2021 ◽  
Vol 72 ◽  
pp. 215-226
Author(s):  
Cheng Cheng ◽  
Hao Chen ◽  
Jiaxin Guo ◽  
Xunzhong Guo ◽  
Yuanji Shi
Keyword(s):  
Forming Quality ◽  
Bending Process ◽  
Thin Walled Tube ◽  
Thin Walled ◽  
Free Bending

Springback prediction of AL6061 pipe in free bending process based on finite element and analytic methods

2020 ◽  
Vol 109 (7-8) ◽  
pp. 1789-1799
Author(s):  
Yusen Li ◽  
Andi Li ◽  
Zhenming Yue ◽  
Liangyu Qiu ◽  
Houssem Badreddine ◽  
...  
Keyword(s):  
Finite Element ◽  
Analytic Methods ◽  
Bending Process ◽  
Springback Prediction ◽  
Free Bending

scholarly journals Vibrational Stresses of Damaged Steam Turbine Blades After Renovation Repair

2021 ◽  
Vol 24 (1) ◽  
pp. 42-52
Author(s):  
Mykola H. Shulzhenko ◽  
◽  
Anton S. Olkhovskyi ◽  
Keyword(s):  
Mechanical Properties ◽  
Strain State ◽  
Turbine Blades ◽  
Excitation Frequency ◽  
Physical And Mechanical Properties ◽  
Erosion Damage ◽  
Trailing Edges ◽  
Blade System ◽  
Last Stage ◽  
Maximum Stresses

The last-stage blades of K-1000-60/3000 steam turbines operate in a humid steam environment, which causes erosion damage in the blades and reduction in their residual life. The relevance of this work is related to the need to continue the safe operation of such turbine blades. A number of variants of the finite-element models of individual blades and last-stage blades in the disk-blade systems of the above turbines are considered. Results of the numerical study of the influence of blade part removals in erosion damage zones after renovation repair on the vibration characteristics of individual blades and blades in the disk-blade system are presented. An analysis of the stress-strain state under the conditional load from the steam flow during the forced oscillations of individual blades and blades in the disk-blade system is carried out. The loads are given as evenly distributed and linearly variable on blade surfaces. The dependence of the maximum equivalent vibration stresses on excitation frequency is determined. It is assumed that the physical and mechanical properties of the blade material are preserved (as for the original version) after the renovation repair of blades and processing of their surfaces. There is a significantly greater reduction in the vibration stresses of blades in the disk-blade system than in the stresses of individual blades. Graphs of the dependence of the maximum stresses on excitation frequency both for undamaged individual blades and blades in the disk-blade system after their renovation repair are given. Various variants of blade part removals in areas of blade leading and trailing edges are considered. It is shown that with decreasing chords of blades after renovation repair, frequency regions of increased vibration may appear in lower blade parts. In the lower parts of individual blades and blades in the disk-blade system, the maximum stresses increase in comparison with their values in undamaged blades. With the change in the stress-strain state of rotor blades in comparison with the original version of undamaged blades, the possibility of extending their safe lifetime in case of multi-cycle fatigue is assessed. The safe lifetime of the considered blades with a chord of at least 150 mm after their renovation repair can be extended according to their stresses, if the cyclic symmetry of the disk-blade system is not violated, and the physical and mechanical properties of the material are preserved after the processing of damage removal zones on blade trailing edges.

Intelligent Control Experiment Study for V-Shape Free Bending of Wide Sheet Metal

2008 ◽  
Vol 575-578 ◽  
pp. 186-191
Author(s):  
Jun Zhao ◽  
Chun Jian Su ◽  
Ying Ping Guan
Keyword(s):  
Sheet Metal ◽  
Intelligent Control ◽  
Control Experiment ◽  
Bending Process ◽  
Prediction And Control ◽  
The Neural Networks ◽  
Die Material ◽  
Object Of Study ◽  
And Control ◽  
Free Bending

The main problem in bending process of sheet metal is that it is difficult to control bending springback accurately. Springback produced from the unloading of bending makes the shape and size incongruent between bending workpiece and working portion of die. Because the final shape of bending workpiece is related with the whole deformation process, the geometric parameter of die, material performance parameter will have great effect on springback. Therefore, the springback problem is very complicated and the prediction and control of springback is the key to improve the accuracy of bending workpiece. Taking the V free bending of wide sheet as an object of study, the neural networks technology and data acquisition system based on LabVIEW are used to establish intelligent control experiment system for V free bending of wide sheet metal. The control accuracy of system is high and it provides the basis for the realization of intelligent control for V-shape free bending of wide sheet metal in practice in future.

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