Numerical Study on Influences of Process Parameters on Laser Tube Bending

2010 ◽  
Vol 148-149 ◽  
pp. 590-594
Author(s):  
Yan Jin Guan ◽  
Hong Mei Zhang ◽  
Sheng Sun ◽  
Guo Qun Zhao
Keyword(s):  
Numerical Study ◽  
Laser Spot ◽  
Forming Process ◽  
Laser Bending ◽  
Bending Angle ◽  
Scanning Velocity ◽  
Bending Process ◽  
Wrap Angle ◽  
Flexible Forming Process ◽  
External Forces

Laser bending process of tubes is a new flexible forming process without rigid tools and external forces. The tube is formed by internal thermal stress induced by laser irradiation. The process simulation of laser bending of tubes is realized numerically. When the other parameters remain invariable, the laser bending angle augments with the increase of the laser power. The laser bending angle decreases with the increase of the scanning velocity. Meanwhile, the bending angle varies with the diameter of the laser spot. The angle begins to decrease when the laser spot diameter get to an optimum value. The bending angle enlarges if the scanning wrap angle augments. The bending angle is largest when the scanning wrap angle is 180°. When the scanning wrap angle is over 180°, the bending angle decreases with the increase of the scanning wrap angle. The relationship between the number of scans and the bending angle is about in direct ratio. The bending angle induced by the first irradiated time is the largest.

Process Optimization of Laser Micro-Bending Using iSIGHT

2008 ◽  
Vol 575-578 ◽  
pp. 408-415
Author(s):  
Jie Liu ◽  
Yan Jin Guan ◽  
Sheng Sun ◽  
Guang Chun Wang
Keyword(s):  
Finite Element ◽  
Stainless Steel ◽  
Laser Power ◽  
Geometrical Parameters ◽  
Beam Diameter ◽  
Forming Process ◽  
Bending Angle ◽  
Scanning Velocity ◽  
Stainless Steel Foil ◽  
Bending Process

There are many factors, such as the laser and geometrical parameters, which influence greatly on the laser bending process. So it is of great importance to determine these variables properly. Considering the relationship of material properties and temperature, a 3-D thermal-mechanical finite element analysis model for laser micro-bending of stainless steel foil is developed based on the software MSC.Marc, and the laser micro-bending process of 0.1mm thick stainless steel foil is implemented. The finite element method simulation process is integrated with the optimization software package iSIGHT through secondary development. The objective function is to realize the maximum bending angle after single laser scan, and laser power, beam diameter and scanning velocity are regarded as the design variables. The forming process is optimized by using genetic algorithm. The optimal result shows the bending angle can be got to the maximum 1.0332°when the laser power, beam diameter and scanning velocity are 32W, 0.17mm and 132mm/s respectively. The experiment results are in good agreement with optimal results.

Temperature Gradient-Based Laser Bending of Full Plates and Plates With Cutout

2020 ◽  
pp. 270-305
Author(s):  
Paramasivan Kalvettukaran ◽  
Sandip Das ◽  
Sundar Marimuthu ◽  
Dipten Misra
Keyword(s):  
Laser Forming ◽  
Forming Process ◽  
Laser Bending ◽  
Bending Angle ◽  
Aisi 304 ◽  
Thermally Induced ◽  
Bending Process ◽  
Gradient Based ◽  
Different Dimensions ◽  
Different Shapes

The laser bending process, also called the laser forming process, consists of irradiating the surface of a sheet or a plate by means of a moving laser beam with a predefined scanning strategy to generate the desired shape through thermally induced residual stress. This chapter presents the mechanisms of a laser bending process and the technological aspects concerning laser v-bending of rectangular AISI 304 plates for full plates and plates with a central cutout at its middle to highlight the process fundamentals and how processing affects the final bending angle of the workpieces. Laser bending involving plates with a cutout will have numerous applications for car bodies, such as front and rear panels where bending is required to be performed on panels with cutout geometries. To investigate the effects of shape and size of the cutout on temperature distribution, stress distribution, and final bending angle, different shapes such as circular, ellipse, rectangular, and square, as well as different dimensions of cutouts have been chosen.

FE Simulation of Complex Contour Forming of Sheet Metals Based on Laser Bending

2008 ◽  
Vol 575-578 ◽  
pp. 696-701
Author(s):  
Yi Bin Chen ◽  
Jian Zhong Zhou ◽  
Shu Huang ◽  
Yue Qing Sun
Keyword(s):  
Numerical Simulation ◽  
Fe Simulation ◽  
Three Dimensional ◽  
External Heat ◽  
Forming Process ◽  
Laser Bending ◽  
Complex Contour ◽  
Analysis Technique ◽  
Flexible Forming Process ◽  
External Forces

Laser bending is a flexible forming process which forms sheet metal by means of stresses induced by external heat instead of external forces. In this paper, a three-dimensional coupled thermal-mechanical model for numerical simulation is established with finite element code ABAQUS. Some key problems about the simulation of laser bending are investigated in detail, and the reasonable solutions are presented. Taking AISI-1008 steel as an example, numerical simulations are carried out for the complex contour forming of sheet by using Sequentially Coupled Thermal-Stress Analysis technique. Then the corresponding experiments are performed to validate the simulation results. Good correlation between the numerical simulation and the experimental results was demonstrated.

Numerical Study on Effect of Using Elastic Pads in Flexible Forming Process

2010 ◽  
Vol 34 (5) ◽  
pp. 549-556 ◽  
Author(s):  
Seong-Chan Heo ◽  
Young-Ho Seo ◽  
Hak-Gon Noh ◽  
Tae-Wan Ku ◽  
Beom-Soo Kang
Keyword(s):  
Numerical Study ◽  
Forming Process ◽  
Flexible Forming ◽  
Flexible Forming Process

Simulation and Control Models of Laser Bending Angle of Sheet Metals

2010 ◽  
Vol 431-432 ◽  
pp. 118-121
Author(s):  
Peng Zhang ◽  
Hong Wei Liu
Keyword(s):  
High Accuracy ◽  
Control Model ◽  
Sheet Metals ◽  
Laser Bending ◽  
Bending Angle ◽  
Dimension Group ◽  
Dimension Analysis ◽  
Bending Process ◽  
Simulation And Control ◽  
And Control

Laser bending process of sheet metals is a highly flexible forming technique. Simulate model of laser bending process was established by dimension analysis, and the control model of laser bending was achieved with the regression of swatch datum. It was shown that dimension analysis was an effective method in simulating the complex laser bending process, and the control model, which came from non-dimension group datum, was a high-accuracy model in predictive analysis of bending angle.

Numerically modeling spring back and spring go amounts and bending deformations of Cr-Mo alloyed sheet material

2020 ◽  
Vol 62 (12) ◽  
pp. 1265-1272
Author(s):  
Mustafa Özdemir ◽  
Hakan Dilipak ◽  
Bülent Bostan
Keyword(s):  
Heat Treatment ◽  
Mathematical Models ◽  
Deformation Zone ◽  
Sheet Material ◽  
Analysis Program ◽  
Spring Back ◽  
Forming Process ◽  
Bending Angle ◽  
Heat Treated ◽  
Bending Process

Abstract In the study conducted for this contribution, sheet material 4 mm thick, non-heat treated (II), normalized (NH) and tempering heat treatment implemented (TH), were formed at a bending angle of 90°. As a result of the forming process, the effects of the R2, R3, R4, R5, and R6 mm punch tip radii on spring back and spring go values were investigated. The bending operations were carried out by waiting for the punch in the material bending zone for 30 sec and then lifting. The samples were extracted from the middle deformation zone of the II, NH and TH applied sheet material, to which the bending process was applied, following which their ferrite phase, pearlite and martensite structures were microstructurally analyzed. A Minitab analysis program was used to investigate the effect of the bending parameters on the sheet material’s spring-back and spring-go behavior. Moreover, the effects of bending parameters were investigated by creating numerical and mathematical models. Thus, it was determined that spring-go behavior occurred on the II and NH applied sheet material, while spring-back behavior occurred on the TH applied material.

scholarly journals Effect of Spring Back on Formation Process of Sheet Metal Bending Plates

Teknomekanik ◽  
2020 ◽  
Vol 3 (1) ◽  
pp. 28-35
Author(s):  
Purwantono Purwantono ◽  
Nelvi Erizon ◽  
Nofri Helmi ◽  
Muhammad Akhbar ◽  
Muhibuddin Muhibuddin
Keyword(s):  
Sheet Metal ◽  
Room Temperature ◽  
Steel Plate ◽  
Metal Plate ◽  
Spring Back ◽  
Forming Process ◽  
Bending Angle ◽  
Small Deviations ◽  
Bending Process ◽  
Bending Plates

This study aims to observe the amount of deviation that occurs due to the influence of spring back on the forming process. spring back in question is the back force when the plate undergoes a forming process, but when the load is released, the plate condition will reverse or return to its initial condition. This reversal is due to the factor of the elasticity of the material that is owned. Other factors that influence the bending process include thickness, width, angle of bending and others. object of this research is a sheet metal plate with a thickness of 1 mm - 4 mm. Forming process is done by bending process. This bending process is widely used in the plate forming process, namely to bend the sides of the plate to make it stiffer. This bending process is carried out in cold conditions where the process is carried out at room temperature. This research was conducted by preparing slices of the same width and length and then the process of bending them to form an angle of 20 ° to 120 °. results of this test indicate that the thicker the bent material has the tendency to produce small deviations. This means that the value of the spring back ratio also decreases. The value of the spring back ratio in this study ranges from 1% to 9%. This means that if the bending process is carried out on a steel plate with the resulting bending angle of 90 °, the bending angle of the shoe must be more than 90 °, the excess is 1 ° - 9 °. So that when the load is released, the position of the susdut bends closer to 90 °.

Numerical Simulation of Laser Bending of Thin Plate Stress Analysis and Prediction

2011 ◽  
Vol 227 ◽  
pp. 27-30
Author(s):  
Toufik Tamsaout ◽  
El Hachemi Amara
Keyword(s):  
Temperature Field ◽  
Analytical Modeling ◽  
Numerical Study ◽  
Numerical Approach ◽  
Laser Forming ◽  
Forming Process ◽  
Laser Bending ◽  
Mechanical Coupling ◽  
Bending Of Thin Plate

Laser forming is a technique consisting in the design and the construction of complex metallic work pieces with special shapes difficult to achieve with the conventional techniques. By using lasers, the main advantage of the process is that it is contactless and does not require any external force. It offers also more flexibility for a lower price. This kind of processing interests the industries that use the stamping or other costly ways for prototypes such as in the aero-spatial, automotive, naval and microelectronics industries. The analytical modeling of laser forming process is often complex or impossible to achieve, since the dimensions and the mechanical properties change with the time and in the space. Therefore, the numerical approach is more suitable for laser forming modeling. Our numerical study is divided into two models, the first one is a purely thermal treatment which allows the determination of the temperature field produced by a laser pass, and the second one consists in the thermo-mechanical coupling treatment. The temperature field resulting from the first stage is used to calculate the stress field, the deformations and the bending angle of the plate.

Effects of Part Geometry on Spring-Back/Spring-Go Feature in U-Bending Process

2013 ◽  
Vol 549 ◽  
pp. 100-107 ◽  
Author(s):  
Wiriyakorn Phanitwong ◽  
Arkarapon Sontamino ◽  
Sutasn Thipprakmas
Keyword(s):  
Laboratory Experiments ◽  
Fem Simulation ◽  
Work Piece ◽  
Spring Back ◽  
Forming Process ◽  
Bending Angle ◽  
Part Geometry ◽  
Bending Process ◽  
Metal Forming Process ◽  
Simulation Results

The U-bending process is a common sheet-metal forming process widely employed to fabricate sheet parts like channels, beams, and frames of various sizes applied in almost all industrial fields. In recent years, the precision requirements are increased on the U-bent parts. To achieve these requirements, in this study, the effects of part geometry on the spring-back/spring-go feature including work piece length, U-channel width, punch and die radii, and work piece thickness, were investigated by using the finite element method (FEM) and laboratory experiments. The FEM simulation results clearly revealed the influence of part geometry on spring-back/spring-go feature via the changes of stress distribution analyses on the bending allowance zone, the bottom of bent part, and the U-leg of bent part. Specifically, the part geometry affected on the bending characteristic on the bending allowance zone, as well as it affected on the spring-back feature. In addition, the part geometry also affected on the formation of reversed bending characteristic on the bottom and U-leg of bent parts, as well as it affected on the spring-go feature. The bending angle could be achieved by compensating these bending and reversed bending characteristics. Therefore, to meet the required bending angle, the suitable design of part geometry was strongly considered to maintain the balancing of the bending and reversed bending characteristics. The laboratory experiments were carried out to validate the accuracy of the FEM simulation results. The FEM simulation results showed good agreement with the experimental results with reference to the bending angle and bending force.

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