Numerical Simulation and Experimental Research on Rolling Process of Conical Ring with Inner Steps

2007 ◽  
Vol 26-28 ◽  
pp. 993-997
Author(s):  
Xing Hui Han ◽  
Lin Hua ◽  
Jian Lan
Keyword(s):  
Numerical Simulation ◽  
Experimental Method ◽  
Experimental Research ◽  
Design Method ◽  
Fem Simulation ◽  
Simulation Method ◽  
Rolling Process ◽  
Experimental Results ◽  
Ring Rolling ◽  
Main Factors

The Conical Ring with Inner Steps (CRIS) is a typical profile ring, which is hard to be formed by ring rolling. Less-profile-filling and shrinking-drawing are the two main defects formed in the rolling process. Through the study of the rolling formability of CRIS with different ratio of height to diameter with the combination of FEM simulation method and experimental method, the main factors that affect the CRIS rolling formability are determined. The CRIS forging is designed. And the FEM simulation and experimental results show that the design method is reasonable.

Calculation and Design Method Study of the Coil-Wound Heat Exchanger

2014 ◽  
Vol 1008-1009 ◽  
pp. 850-860 ◽  
Author(s):  
Zhou Wei Zhang ◽  
Jia Xing Xue ◽  
Ya Hong Wang
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Heat Exchanger ◽  
Design Method ◽  
Fluid Velocity ◽  
Exchange Process ◽  
Three Dimensional ◽  
Simulation Method ◽  
Physical Parameters ◽  
Numerical Result

A calculation method for counter-current type coil-wound heat exchanger is presented for heat exchange process. The numerical simulation method is applied to determine the basic physical parameters of wound bundles. By controlling the inlet fluid velocity varying in coil-wound heat exchanger to program and calculate the iterative process. The calculation data is analyzed by comparison of numerical result and the unit three dimensional pipe bundle model was built. Studies show that the introduction of numerical simulation can simplify the pipe winding process and accelerate the calculation and design of overall configuration in coil-wound heat exchanger. This method can be applied to the physical modeling and heat transfer calculation of pipe bundles in coil wound heat exchanger, program to calculate the complex heat transfer changing with velocity and other parameters, and optimize the overall design and calculation of spiral bundles.

Experimental and numerical investigation of the thermomechanical load on a turbine housing in a radial turbocharger

2021 ◽  
pp. 095440702110521
Author(s):  
Shaolin Chen ◽  
Hong Zhang ◽  
Liaoping Hu ◽  
Guangqing He ◽  
Fen Lei ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Fatigue Life ◽  
Simulation Analysis ◽  
Simulation Method ◽  
Testing Temperature ◽  
Experimental Results ◽  
Maximum Temperature ◽  
Monitoring Point ◽  
Turbine Housing

The fatigue life of turbine housing is an important index to measure the reliability of a radial turbocharger. The increase in turbine inlet temperatures in the last few years has resulted in a decrease in the fatigue life of turbine housing. A simulation method and experimental verification are required to predict the life of a turbine housing in the early design and development process precisely. The temperature field distribution of the turbine housing is calculated using the steady-state bidirectional coupled conjugate heat transfer method. Next, the temperature field results are considered as the boundary for calculating the turbine housing temperature and thermomechanical strain, and then, the thermomechanical strain of the turbine housing is determined. Infrared and digital image correlations are used to measure the turbine housing surface temperature and total thermomechanical strain. Compared to the numerical solution, the maximum temperature RMS (Root Mean Square) error of the monitoring point in the monitoring area is only 3.5%; the maximum strain RMS error reached 11%. Experimental results of temperature field test and strain measurement test show that the testing temperature and total strain results are approximately equal to the solution of the numerical simulation. Based on the comparison between the numerical calculation and experimental results, the numerical simulation and test results were found to be in good agreement. The experimental and simulation results of this method can be used as the temperature and strain (stress) boundaries for subsequent thermomechanical fatigue (TMF) simulation analysis of the turbine housing.

Design method for intermediate roll in multi-stage profile ring rolling process: The case for excavator idler rim

2014 ◽  
Vol 15 (3) ◽  
pp. 503-512 ◽  
Author(s):  
Kyung-Hun Lee ◽  
Dae-Cheol Ko ◽  
Dong-Hwan Kim ◽  
Seon-Bong Lee ◽  
Nag-Mun Sung ◽  
...  
Keyword(s):  
Design Method ◽  
Rolling Process ◽  
Ring Rolling ◽  
Multi Stage ◽  
Ring Rolling Process ◽  
Profile Ring Rolling

Cantalever Protection Aluminum Profiles Extrusion Die Design Method and Numerical Simulation

2012 ◽  
Vol 152-154 ◽  
pp. 301-305
Author(s):  
Jian Yi Pan ◽  
Yao Wang ◽  
Zhao Yao Zhou ◽  
Shou Bin Dong
Keyword(s):  
Numerical Simulation ◽  
Material Flow ◽  
Design Method ◽  
Simulation Method ◽  
Die Design ◽  
Design Scheme ◽  
Extrusion Dies ◽  
Cantilever Structure ◽  
Extrusion Die Design ◽  
Stress And Deformation

In order to improve the service life of extrusion dies with long cantilever structure, a design scheme of porthole die for half-hollow profiles with long cantilever was introduced. Using numerical simulation method, compared with conventional method for the half-hollow porthole design method of a typical profile die model, the equilibrium of the material flow at the outlet, the stress and deformation of the die were analyzed in detail. With selection of the cantilever thickness shrinkage as the objective function, experiment was done to verify the result of simulating analysis. The results indicated that there was only little difference for the equilibrium of material flow between the two design schemes, but the stress load and deformation of the design scheme were greatly improved.

Effects of Mandrel Structure on Ring Rolling Process for Large-Scale T-Sectioned Ring with Numerical Simulation

2013 ◽  
Vol 690-693 ◽  
pp. 2307-2310
Author(s):  
Ping Zhen Zhou ◽  
Li Wen Zhang ◽  
Sen Dong Gu ◽  
Hong Tao Duan ◽  
Li Hong Teng
Keyword(s):  
Numerical Simulation ◽  
Large Scale ◽  
Rolling Process ◽  
Ring Rolling ◽  
Small Ring ◽  
Rigid Plastic ◽  
Axial Ring ◽  
Folding Defect ◽  
Ring Rolling Process ◽  
Forming Defects

The process parameters including the mandrel structure of radial-axial ring rolling is in close relationship with the forming defects such as over-high axial spread and the folding defect in the connecting part of the big and small ring. In this paper, a 3D rigid-plastic and coupled thermal-mechanical finite-element model (FEM) of radial-axial ring rolling for large-scale T-sectioned ring was developed using commercial software of DEFORM-3D. By changing the chamfer radius of mandrel's work roll, the effects of mandrel structure on the height of axial spread which considerably affects the stability of the ring rolling process were investigated. The folding defect was also simulated. The numerical simulation results showed that with the decrement of the chamfer radius r, the metal increasingly accumulated in the big ring and the axial spread height increased. Consequently, the ring rolling process became unstable. Also, the folding angle augmented.

Numerical Research on the Floor Heave Control of Deep Roadway in Coal Mining

2012 ◽  
Vol 524-527 ◽  
pp. 446-449 ◽  
Author(s):  
Fu Kun Xiao ◽  
Chun Jie Zhang ◽  
Li Wei Gao ◽  
Yang Yang Yue
Keyword(s):  
Numerical Simulation ◽  
Simulation Method ◽  
Good Effect ◽  
Optimal Program ◽  
Anchor Cable ◽  
Geological Conditions ◽  
Floor Heave ◽  
Mine Roadway ◽  
Numerical Research ◽  
Main Factors

On the engineering background of coal mine roadway orbit, according to the destruction of its original roadway, the paper have analyzed the situation of the deformation in the roadway , using the method of numerical simulation. Besides, it also determined the stress distribution and the forces supporting of roadway in the deformation process. Geological conditions, support patterns and bad construction are considered as the main factors of roadway damage and new support method is given. Numerical simulation method is used to study mechanism about anchor rod, anchor cable and anchor mesh coupled with the surrounding, bottom corner anchor rod and grouting to determine the optimal program. The new program is applied to the practice field and monitored, indicating that the application has a very good effect.

The Effect of Inclusions on Internal Cracks for 20Mn5N Steel Ingot after Forging

2013 ◽  
Vol 834-836 ◽  
pp. 829-838
Author(s):  
Jin Zhu Gao ◽  
Pai Xian Fu ◽  
Hong Wei Liu ◽  
Xiao Ping Ma
Keyword(s):  
Stress Concentration ◽  
Steel Ingot ◽  
Fem Simulation ◽  
Simulation Method ◽  
Experimental Results ◽  
Banded Structure ◽  
Fundamental Cause

The heavy forging ingots of steel 20Mn5N have been extensively used to fabricate the hydropower shaft steel, which plays as an extremely important part in industry. However, the quality of the heavy ingots has been commonly affected by various inner defects. One of the most typical defects is internal cracks, which has been found to be always accompanied by inclusions. In order to effectively analyze the formation of internal cracks, a 30-ton 20Mn5N ingot has been cut along the axle plane. Exceeding macroscopic cracks can be found in macro-segregation area gathered many large and grid inclusions (Al2O3). Based on the experimental results and FEM simulation method we have investigated that large and grid inclusions accompanied by other macro-visible defects such as banded structure could lead to the forging cracks easily. FEM simulation result shows that the stress concentration resulting from the large and grid inclusions (Al2O3) is relatively large. These large and grid inclusions accompanied by banded structure are the fundamental cause of cracks.

Numerical Simulation and Experimental Research on Wrinkle Defect During Hot Bar Rolling Process

2012 ◽  
Author(s):  
Lin Chen ◽  
Chun Xu
Keyword(s):  
Fem Simulation ◽  
Simulation Method ◽  
Rolling Process ◽  
Optical Microscope ◽  
Bar Rolling ◽  
Paper Surface ◽  
Surface Wrinkle ◽  
Shallow Crack ◽  
Continuous Casting Billet ◽  
Inducing Surface

In the paper, surface wrinkle defect occurring during hot bar rolling process is studied with the combination of FEM simulation method and experimental method. The effect of entry width and the fillet radii of billet on displacement velocity and profile on billet corner is simulating analyzed. The calculated results have the same regularity as the experiment with continuous casting billet. It is found that the shallow crack or deeply fissures on the surface of workpiece are observed with the increase of the entry width and decrease of fillet radii of billet. All of crack regions are ditches with different sizes on the surface in optical microscope. At the same time, the flowing velocity of metal on billet corner is quite different from FEM simulation, some have so negative movement that resulting in ditches in the profile. Simulated results had the same tendency of formation of crack as the experimental results. Either result reveals that the main reason inducing surface wrinkle defect to occur during hot bar rolling process is the opposite flowing velocity of metal on billet corner.

Study on External Prestressing Connection Mode of the Simply-Supported and Continued Structure System

2013 ◽  
Vol 405-408 ◽  
pp. 1513-1516
Author(s):  
Xiu Juan Jiang ◽  
Rong Da Li ◽  
Jun Yan Wu ◽  
Jian Xin Liu
Keyword(s):  
Numerical Simulation ◽  
Experimental Research ◽  
Continuous System ◽  
Simulation Method ◽  
Internal Force ◽  
Element Analysis ◽  
Structure System ◽  
Simply Supported ◽  
External Prestressing

Simply supported beam by applying the external prestressing change as a continuous system can be a substantial increase in the bridge carrying capacity, but more complex in vitro beam connection segment force. To study the forced state of external prestressing connection mode of the simply-supported and continued structure system, it is studied by both the way of numerical simulation using the finite element analysis software ANSYS and experimental research. The physical model to simulate the prestressed concrete structure and the test process are described. By comparing the results of numerical simulation and experimental research, the stress stage of the connection mode is divided. As a result, a simplified method of calculating the deflection based on the elastic theory is proposed. The internal force redistribution of the structure is also determined. The results of the numerical simulation method are reliable because it is similar to measured results.

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