Study on the Pretightening Assembly Moving Beam of Open-Die Forging Hydraulic Press

2011 ◽  
Vol 399-401 ◽  
pp. 1779-1784
Author(s):  
Rui Jie Gu ◽  
He Yang ◽  
Ying Jie Zhang ◽  
Zhi Yuan Fang ◽  
Yu Lin Fan ◽  
...  
Keyword(s):  
Stress Distribution ◽  
Fe Simulation ◽  
Hydraulic Press ◽  
Simulation Software ◽  
Fe Model ◽  
Allowable Stress ◽  
Die Forging ◽  
Moving Beam ◽  
Open Die Forging ◽  
Computing Method

The FE model of the pretightening assembly moving beam of open-die forging hydraulic press is built with FE simulation software ABAQUS in the study. With the FE model, the force status of pretightening assembly moving beam is studied. Then the pretightening force of assembly moving beam is further studied and the computing method of pretightening force is given. The main achievements of the study include: Under pretightening, the stress of main moving beam is very low and that of guild sleeves is also lower than the allowable stress. Under center loading, the stress of the center field of main moving beam is higher and that of guild sleeves is almost same to that of pretightening. Under eccentric loading, the stress of same deviation field of main moving beam is higher and the effect of pretightening force on the stress of main moving beam is very small. The stress distribution of guild sleeves with different pretightening force is same and the effect of pretightening force on its strength is very low. The pretightening force of tension rod can be computed with the force of press, the allowable eccentric value of the workpiece, the distance between up guild section and down guild section of guild sleeve and the quantity of tension rods. The results of the study are very useful to design and install the pretightening assembly moving beam of open-die forging hydraulic press.

Simulation Study on the Frame of Pipe End Upsetting Machine and its Structure Optimization

2011 ◽  
Vol 337 ◽  
pp. 307-312
Author(s):  
Rui Jie Gu ◽  
Gang Lei ◽  
Guo Dong Shao ◽  
Ming Jie Ren ◽  
Yun Hai Jing ◽  
...  
Keyword(s):  
Stress Concentration ◽  
Simulation Study ◽  
Fe Simulation ◽  
Structure Optimization ◽  
Hydraulic Press ◽  
Simulation Software ◽  
Fe Model ◽  
Corner Radius ◽  
Torsion Deformation

The FE model of the frame of pipe end upsetting machine is built with FE simulation software ABAQUS in the study. With the FE model, the force status of the frame is studied. By which, it is found that stress concentration occurs at the inner corner of the frame and bigger corner radius can improve the stress status; the stress of main cylinder body on the up beam is high because of the action of hydraulic press; the frame is bent outward in the up-down direction and bent inward in the left-right direction when the tube is clamped tightly; the earlier deformation of the frame is improved when the tube is upset, but the torsion deformation is found in the frame; the frame is optimized and the strength and the stiffness of the optimized frame can be satisfied with the requirement of application. The results of the study are very useful to design the frame of the pipe end upsetting machine.

Hydraulic Press Open Die Forging of 21CrMoV5-7 Steel CCM Roller with Flat Upper and Concave Semi-round Lower Cogging Dies

2021 ◽  
pp. 489-498
Author(s):  
Volodymyr Kukhar ◽  
Oleg Vasylevskyi ◽  
Olha Khliestova ◽  
Ivan Berestovoi ◽  
Elena Balalayeva
Keyword(s):  
Hydraulic Press ◽  
Die Forging ◽  
Open Die Forging

Co-Simulation Research of the Balancing Control of the Moving Beam of a Heavy Hydraulic Press During the Die Forging Process

2017 ◽  
Author(s):  
Wenzhu Wang ◽  
Dong Du ◽  
Rendong Wu ◽  
Chaolong Yuan ◽  
Baohua Chang
Keyword(s):  
Control Process ◽  
Virtual Prototype ◽  
Hydraulic Press ◽  
Heavy Duty ◽  
Eccentric Load ◽  
Forging Process ◽  
Die Forging ◽  
Moving Beam ◽  
Synchronous Rectification ◽  
Balancing Control

A virtual prototype of the moving beam balancing system of a heavy-duty hydraulic press working under die forging function is built with Adams, AMESim and Simulink, and the balancing control process is analyzed using this prototype. The moving beam of the heavy-duty hydraulic press may tilt due to the eccentric load during the die forging processing, and thus affect the forging quality and the safety of the press. So it is necessary to research the beam balancing control process. Compared to the traditional methods based on simplified mathematical models, virtual prototype technology can obtain a co-simulation model, avoid tedious formula derivation and solving work, and save test time and cost. Based on the analysis of the working principle of balancing system, this paper establishes a dynamical model of the moving beam, a hydraulic circuit model of the single balancing system and a controller model using Adams, AMESim and Simulink, respectively. Then a virtual prototype is built using the three models via co-simulation interface files. The eccentric load signal is constructed in AMESim according to the variation of eccentric load during die forging process. By adjusting the controller parameters, the rapid balancing of the moving beam under eccentric load conditions is realized, and high precision of dynamic balancing and steady equilibrium is obtained. The simulation results show that the single balancing unit can achieve effective balancing of the moving beam, and the co-simulation analysis method based on the virtual prototype built with Adams, AMESim and Simulink is feasible in the research of the synchronous rectification of the moving beam. This work is a useful exploration in the research of synchronous rectification of moving beams.

scholarly journals The Effects of Shot Distance and Impact Sequence on the Residual Stress Field in Shot Peening Finite Element Model

Metals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 462
Author(s):  
Zhou Wang ◽  
Ming Shi ◽  
Jin Gan ◽  
Xiaoli Wang ◽  
Ying Yang ◽  
...  
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Stress Distribution ◽  
Shot Peening ◽  
Dynamic Models ◽  
Fe Simulation ◽  
Residual Stress Distribution ◽  
Fe Model ◽  
Residual Stress Field ◽  
The Impact

In order to investigate the effect of shot distance and impact sequence on the residual stress distribution of 42CrMo steel in shot peening (SP) finite element (FE) simulation, 3D dynamic models with order dimple pattern and stochastic dimple pattern were established via ABAQUS/Explicit 6.14, and the simulation results were compared with experiments. The results show that shot overlap has a significant effect on the residual stress distribution of peened parts. Meanwhile, there is a threshold (related to SP parameter) for shot distance in the vertical and horizontal directions. When the shot distance is greater than the threshold in this direction, the residual stress distribution after SP tends to be stable. The impact sequence has almost no effect on the impact of a small number of shots, but this effect will appear when the number of shots increases. It is necessary to avoid shot overlap and continuous impact of adjacent dimples when the FE model is established; on this basis, the distance between shots and the number of layers of the shots can be reduced as much as possible without affecting the residual stress distribution. In addition, the comparison of simulation and experimental results shows that the residual stress evaluation area consistent with the experimental measurement is essential to obtain accurate residual stress distribution in the FE simulation process.

scholarly journals Prediction of the parameters and the hot open die elongation forging process on an 80 MN hydraulic press

2021 ◽  
Vol 11 (1) ◽  
pp. 528-534
Author(s):  
Ryszard Dindorf ◽  
Jakub Takosoglu ◽  
Piotr Wos
Keyword(s):  
Dynamic Model ◽  
Predictive Control ◽  
Material Properties ◽  
Hydraulic Press ◽  
Generalized Predictive Control ◽  
Main Task ◽  
Forging Process ◽  
Die Forging ◽  
Open Die Forging ◽  
Forging Press

Abstract The main task of the study was to develop and implement predictive control in the hot open die forging process of heavy, large, and hard deformable steel forgings on an 80 MN hydraulic press at the Forged Products Department (FPD) of Celsa Huta Ostrowiec (CHO). The predicted hot flow stresses and the predicted deformation/forging forces as a function of the parameters of the elongation forging process were determined. The predicted parameters of the forging process were included in the dynamic model of the hydraulic forging press. Generalized predictive control (GPC) algorithm of the hot open-die forging process on the hydraulic press was developed. The use of predictive control solved the uncertainty of the hot open forging process, which depends on the dimensions, shapes, and material properties of the forgings, as well as the parameters of the hydraulic press and forging tools.

Finite Element Analysis and Calculation of Tongue-Tearing Process of Woven Fabric

2011 ◽  
Vol 181-182 ◽  
pp. 443-448 ◽  
Author(s):  
Ping Wang ◽  
Bao Zhong Sun
Keyword(s):  
Finite Element ◽  
Fe Simulation ◽  
Test System ◽  
Simulation Software ◽  
Woven Fabric ◽  
Fe Model ◽  
Element Analysis ◽  
Weave Structure ◽  
Simulation And Experiment ◽  
Tearing Strength

Tearing is a common failure type during the service life of woven fabric. In this paper, tongue-tearing strength of a tight twill-woven fabric with weave structure of was tested on the Material Test System (MTS810.23). A Finite Element (FE) model was developed with FE simulation software ABAQUS based on the geometrical characteristics of the woven fabric. With this meso-modeling method, the whole tongue-tearing process was dynamically displayed. Tearing strength and failure morphologies were compared between FE simulation and experiment result, and good agreements were found. Also, a mesh scheme independent research was conducted for this FE model.

Study on the Deformation of the Prestress Frame of Open-Die Forging Hydraulic Press with Different Operating Modes

2012 ◽  
Vol 490-495 ◽  
pp. 3638-3642
Author(s):  
Rui Jie Gu ◽  
Ying Jie Zhang ◽  
Zhi Yuan Fang ◽  
Yu Lin Fan ◽  
Shao Fan Zhou ◽  
...  
Keyword(s):  
Element Model ◽  
Hydraulic Press ◽  
Operating Modes ◽  
Prestressing Force ◽  
Bending Effect ◽  
Die Forging ◽  
Section Area ◽  
Working Length ◽  
The Press ◽  
Open Die Forging

The deformation of the prestress frame of open-die forging hydraulic press is studied in the paper. Firstly, the computing formula of true prestressing force of frame is deduced, and then the finite element model of prestress frame is established. With the model, the deformation of prestress frame is studied when the press works under different operating modes including upsetting, elongating and saddle forging and the effect of different operating modes on the deformation are revealed. The main achievements include: The true prestressing force of frame can be gained with nominal prestressing force, section area and working length of tension rods, section area and length of columns. Under prestress, the stress of the field of up beam and down beam acted by the axial force of tension rods and columns is bigger, that of the other field is very small. Under working loads, up beam and down beam tend to open out, tension rods and columns tend to bend in, and the bending effect cause the stress of inner field of tension rods bigger than that of outer field and the stress of inner field of columns smaller than that of outer field. The deformation of down beam under saddle forging is different with that under upsetting and elongating. The stress of center field of down beam under upsetting and elongating is higher and that of front and back field of down beam under upsetting is higher. The main achievements of the study are useful to design the prestress frame of open-die forging hydraulic press and the research method can be used to study the prestress frame of other equipments.

scholarly journals Investigation of the Influence of Open-Die Forging Parameters on the Flow Kinetics of AZ91 Magnesium Alloy

Materials ◽  
2021 ◽  
Vol 14 (14) ◽  
pp. 4010
Author(s):  
Grzegorz Banaszek ◽  
Teresa Bajor ◽  
Anna Kawałek ◽  
Tomasz Garstka
Keyword(s):  
Magnesium Alloy ◽  
Operation Time ◽  
Strength Properties ◽  
Hydraulic Press ◽  
Az91 Alloy ◽  
Az91 Magnesium Alloy ◽  
Numerical Tests ◽  
Az91 Magnesium ◽  
Product Manufacturing ◽  
Open Die Forging

This paper presents the results of numerical tests of the process of forging magnesium alloy ingots (AZ91) on a hydraulic press with the use of flat and proprietary shaped anvils. The analysis of the hydrostatic pressure distribution and the deformation intensity was carried out. It is one of the elements used for determining the assumptions for the technology of forging to obtain a semi-finished product from the AZ91 alloy with good strength properties. The aim of the research was to reduce the number of forging passes, which will shorten the operation time and reduce the product manufacturing costs. Numerical tests of the AZ91 magnesium alloy were carried out using commercial Forge®NxT software.

A Control Strategy and Upper Bound Solution for Non-Flat Tool Open Die Forging Automation

1999 ◽  
Author(s):  
T. J. Nye
Keyword(s):  
Control Strategy ◽  
Upper Bound ◽  
Sequence Generation ◽  
Bound Solution ◽  
Upper Bound Solution ◽  
Die Forging ◽  
Strategy Model ◽  
Model Predictions ◽  
Open Die Forging ◽  
Good Agreement

Abstract The open die forging process can provide a number of benefits if its costs can be made competitive through automation. This paper describes a control strategy for automated open die forging forming sequence generation. An upper bound solution for forging with radiused tools is developed, along with a method for using this solution to estimate forming results, a necessary component of the control strategy. Model predictions are compared to physical experimental data using plasticine, and show good agreement.

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