Preform design in axial hot closed die forging by isothermal surface method. Part 3. Preform design of industrial cases

2021 ◽  
pp. 305-313
Author(s):  
A.V. Vlasov ◽  
D.V. Krivenko ◽  
S.A. Stebunov ◽  
N.V. Biba ◽  
A.M. Dyuzhev
Keyword(s):  
Metal Forming ◽  
Simulation Software ◽  
Preform Design ◽  
Design Algorithm ◽  
Forming Simulation ◽  
Die Geometry ◽  
Surface Method ◽  
Closed Die Forging ◽  
Preform Shape

The isothermal surfaces method for preform design is proposed. The procedure for determining of the preform shape is given. The features in using of the method for forgings with various shapes are considered. The method is illustrated by industrial examples. The design algorithm uses the QForm metal forming simulation software to build isothermal surfaces and check the quality of the designed die geometry by finite element modeling, as well as specially developed version of the QFormDirect CAD based on SpaceClaimтм.

Preform design in axial hot closed die forging by isothermal surface method. Part 2. Application of isothermal surfaces method for complex shape forgings

2021 ◽  
pp. 268-272
Author(s):  
A.V. Vlasov ◽  
D.V. Krivenko ◽  
S.A. Stebunov ◽  
N.V. Biba ◽  
A.M. Dyuzhev
Keyword(s):  
Complex Shape ◽  
Simulation Software ◽  
Preform Design ◽  
Design Algorithm ◽  
Forming Simulation ◽  
Die Geometry ◽  
Surface Method ◽  
Closed Die Forging ◽  
Preform Shape

The isothermal surfaces method for preform design is proposed. The procedure for determining of the preform shape is given. The features in using of the method for forgings with various shapes are considered. The method is illustrated by industrial examples. The design algorithm uses the QForm metal forming simulation software to build isothermal surfaces and check the quality of the designed die geometry by finite element modeling, as well as specially developed version of the QFormDirect CAD based on SpaceClaimтм.

Preform design in axial hot closed die forging by isothermal surface method. Part 1. Overview of preform design methods. Theoretical aspects and algorithm of preform shape design

2021 ◽  
pp. 214-220
Author(s):  
A.V. Vlasov ◽  
D.V. Krivenko ◽  
S.A. Stebunov ◽  
N.V. Biba ◽  
A.M. Dyuzhev
Keyword(s):  
Simulation Software ◽  
Preform Design ◽  
Mathematical Basis ◽  
Design Algorithm ◽  
Forming Simulation ◽  
Die Geometry ◽  
Die Forging ◽  
Closed Die Forging ◽  
Trial And Error Method ◽  
Preform Shape

Methods of preform design in hot-die forging are analyzed. It is noted that despite numerous works in this fi eld, preform design is still often based on the trial-and-error method. The isothermal surfaces method for preform design is proposed and its mathematical basis is considered. The procedure for determining of the preform shape is given. The design algorithm uses the QForm metal forming simulation software to build isothermal surfaces and check in the quality of the designed die geometry by finite element modeling, as well as specially developed version of the QFormDirect CAD based on SpaceClaim™.

Preform Design in Metal Forming

1989 ◽  
Author(s):  
Shiro Kobayashi ◽  
Soo-Ik Oh ◽  
Taylan Altan
Keyword(s):  
Metal Forming ◽  
Simulation Technique ◽  
Production Costs ◽  
Process Conditions ◽  
Preform Design ◽  
Forward Simulation ◽  
Forming Process ◽  
Closed Die Forging ◽  
Preform Shape

Preform design in metal forming refers to the design of an initial shape of the workpiece that, when it has undergone an associated forming process, forms the required product shape with desired property successfully without formation of defects and without excessive waste of materials. A carefully selected preform can contribute significantly to the reduction of the production costs. Preform design problems are encountered in various metal-forming processes, such as closed-die forging, shell nosing, rolling, and sheet-metal forming. Design of an optimal preform shape requires simultaneous determination of optimal process conditions. However, we are here concerned with the determination of the best preform shape under a given set of process conditions. In this chapter, a new method of “backward tracing” is introduced as an alternative approach to the solution of preform design, and the applications of this method to some specific processes are discussed. Similarly to the forward simulation technique, the backward tracing method uses the finite-element method. The forward simulation technique has been discussed in the previous chapters. Backward tracing refers to the prediction of the part configuration at any stage in a deformation process, when the final part geometry and process conditions are given. The concept is illustrated in Fig. 15.1. At time t = t0, the geometrical configuration x0 of a deforming body is represented by a point Q. The point Q is arrived at from the point P, whose configuration is given as x0–1 at t = t0–1, through the displacement field during a time-step Δt, namely, x0 = x0–1 + u0–1 Δt, where u0–1 is the velocity field at t = t0–1. Therefore, the problem is to determine u0–1, based on the information (x0) at point Q. The solution scheme is as follows: taking a loading solution u0 (forward) at Q, a first estimate of P can be made according to P(1) = x0 – u0 Δt.

scholarly journals Optimize the Rolling Process Parameters for Material AA1100 using Metal Forming Simulation

2018 ◽  
Vol 144 ◽  
pp. 03005
Author(s):  
T. S. Hemanth ◽  
Y. Arunkumar ◽  
M. S. Srinath.
Keyword(s):  
Effective Stress ◽  
Metal Forming ◽  
Optimization Technique ◽  
Rolling Process ◽  
Simulation Software ◽  
Percentage Reduction ◽  
Forming Process ◽  
Taguchi Optimization ◽  
Manufacturing Simulation ◽  
Forming Simulation

Metal forming plays a very important role in the manufacturing. Simulation of manufacturing process aids in the improvement of quality, reduce energy and resource consumption and helps in visualization of the process. The design of experiment helps in optimization of the parameters in any processes. In this paper, Taguchi optimization technique is used to predict the best results for the given inputs such as roller diameter, friction value, velocity of the rollers and percentage reduction to the forming process and get the optimized values for spread, hardness, effective stress, power required, strain rate and torque using the manufacturing simulation software. It is found that the important parameter is percentage reduction affecting the effective stress. Optimal parameters with desirability value of 0.87 have been obtained.

Accumulation and Healing of Damage during Plastic Metal Forming Simulation and Experiment

2012 ◽  
Vol 528 ◽  
pp. 61-69 ◽  
Author(s):  
S.V. Smirnov
Keyword(s):  
Experimental Data ◽  
Plastic Deformation ◽  
Metal Forming ◽  
Damage Accumulation ◽  
Adaptive Model ◽  
Steel Blank ◽  
Forming Simulation ◽  
Closed Die Forging ◽  
Plastic Metal ◽  
Simulation And Experiment

Based on the analysis of experimental data on measuring metal density under plastic deformation, an adaptive model of damage accumulation, which takes into account the transient processes of damage variation with changes in loading conditions, has been formulated. The analysis of damage in the process of cold closed-die forging of a lid-type steel blank being taken as an example, the applicability of the model to the prediction of fracture in the optimization of industrial metal forming technologies has been demonstrated.

Study the Effect of Different Roller Shape on the Spread of Material in Rolling Operation Using Manufacturing Simulation

2019 ◽  
Vol 895 ◽  
pp. 290-294
Author(s):  
T.S. Hemanth ◽  
Y. Arunkumar ◽  
M.S. Srinath
Keyword(s):  
Metal Forming ◽  
Metal Flow ◽  
Vital Role ◽  
Simulation Software ◽  
Simulation Experiments ◽  
Lateral Direction ◽  
Forming Simulation ◽  
Bulk Forming ◽  
Different Shapes ◽  
Materials Used

Simulation plays a vital role in present-day product development. Simulation of manufacturing process in product design and development helps to save valuable resources in terms of materials, energy and also in the optimisation of process parameters. Metal rolling accounts to majority of the materials used in the bulk-forming. It is difficult to predict metal flow in the lateral direction in the conventional metal rolling. Manufacturing the rollers of different shapes and conducting experiments physically consumes valuable resources. These valuable resource are saved using the simulation of rolling operations using FEM-based metal forming simulation software. Simulation experiments are carried out to determine the effect of different shapes of rollers on the spread of material. In this work, spread of the material is analysed when the material is passed through different shaped rollers. Three types of rollers have been designed to study the effect of adding grooves on the spread of materials. It is seen that smaller groove size decreases the spread whereas larger size groove on the rollers increases the spread.

Research on Simulation Technology for Auto Panel in Drawing Forming Based on Autoform

2011 ◽  
Vol 291-294 ◽  
pp. 259-262
Author(s):  
Xi Fen Liu ◽  
Yi Hua Hu ◽  
Wei Jian Huang
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Simulation Analysis ◽  
Drawing Process ◽  
Forming Simulation ◽  
Simulation Results ◽  
Auto Panel ◽  
Cae Simulation

The features and functions of Autoform software for sheet metal forming simulation were introduced. Taking the auto panel as an example, based on UG and Autoform, the process of CAE simulation analysis on the drawing process was stated in this paper and the simulation results were analyzed. The results of analyses indicated that the crack tendency was in the two salient of auto panel flange in the drawing process. By optimizing and adjusting the parameters of mold, the problem of crack tendency was solved. The optimal stamping process was finally determined based on the results of the simulation. Compared with the traditional stamping technology and die designing, the quality of die designing was improved by adopting CAE technique.

A Simulation Software for the Evaluation of Vulnerabilities in Reputation Management Systems

2021 ◽  
Vol 37 (1-4) ◽  
pp. 1-30
Author(s):  
Vincenzo Agate ◽  
Alessandra De Paola ◽  
Giuseppe Lo Re ◽  
Marco Morana
Keyword(s):  
Quality Of Service ◽  
Distributed Systems ◽  
State Of The Art ◽  
Simulation Software ◽  
Reputation Management ◽  
Management Systems ◽  
Security Attacks ◽  
Vulnerability Evaluation ◽  
Multi Agent

Multi-agent distributed systems are characterized by autonomous entities that interact with each other to provide, and/or request, different kinds of services. In several contexts, especially when a reward is offered according to the quality of service, individual agents (or coordinated groups) may act in a selfish way. To prevent such behaviours, distributed Reputation Management Systems (RMSs) provide every agent with the capability of computing the reputation of the others according to direct past interactions, as well as indirect opinions reported by their neighbourhood. This last point introduces a weakness on gossiped information that makes RMSs vulnerable to malicious agents’ intent on disseminating false reputation values. Given the variety of application scenarios in which RMSs can be adopted, as well as the multitude of behaviours that agents can implement, designers need RMS evaluation tools that allow them to predict the robustness of the system to security attacks, before its actual deployment. To this aim, we present a simulation software for the vulnerability evaluation of RMSs and illustrate three case studies in which this tool was effectively used to model and assess state-of-the-art RMSs.

Soft Reduction of a Cast Ingot on the Incomplete Crystallization Stage

2013 ◽  
Vol 762 ◽  
pp. 261-265 ◽  
Author(s):  
Tanya I. Cherkashina ◽  
Igor Mazur ◽  
Sergey A. Aksenov
Keyword(s):  
Metal Forming ◽  
Physical Simulation ◽  
Fluid Layer ◽  
Liquid Core ◽  
Soft Reduction ◽  
Deformation Processes ◽  
Novel Method ◽  
Full Scale Tests ◽  
Crystallization Stage

Numerical and physical simulation on model samples can provide data for various aspects of metal forming, without resorting to time-consuming and costly full-scale tests. This paper presents examples of modeling of the deformation of a slab with a liquid core. The use of soft reduction can enhance the homogeneity of the structure, which improves the quality of cast billets. Mathematical modeling is described here where the fluid layer is taken into account by the influence of boundary conditions in the crust in the form of ferrostatic pressure, which allows calculation of the intensity of deformation, total deformation and strain. It also provides a novel method for studying the process of soft reduction. It is based on a physical model of the slab consisting of a closed solid shell made of a calibrated lead shot and the Wood's alloy. To simulate the liquid molten metal, the interior of the shell is filled with gelatin. This approach can be applied to further studies on deformation processes and the penetration of deformation into complex metallic systems.

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