The Research of Forgeability for Warm Temperatures Using Simulation

2013 ◽  
Vol 749 ◽  
pp. 18-22
Author(s):  
Maria Kapustova ◽  
Marek Zvončan
Keyword(s):  
Numerical Simulation ◽  
Surface Quality ◽  
Temperature Interval ◽  
Case Hardening ◽  
Steel Alloy ◽  
Warm Temperature ◽  
Practical Test ◽  
Technological Test ◽  
Warm Forging ◽  
The Given

At nowadays the interest of forging shops is focused on technology of accurate die warm forging. It is possible to reach higher exploitation of material, higher surface quality and higher accuracy of forgings in comparison to standard forging. The advance of warm forging relates to research of ductility and plasticity of forged material in warm temperature range. This paper provides the results of the research of 16MnCr5 steel forgeability in the interval of temperatures of warm forging. Steel alloy 16MnCr5 is proper for case hardening and for the production of precision die forging. In this paper the description of methodology for the proper interval setting of temperatures of warm forging for the given type of steel can be found. Practical test and a numerical simulation has proven the propriety of the examined steel for forging in the temperature interval 600, 650, 700 and 750 °C. For the steel forgeability verification in the recommended interval of warm forging temperatures, the technological test of upsetting according to Zidek was used.

The Verification of Material Plastic Flow at Optimal Warm Forging Temperature Using Computer Simulation

2013 ◽  
Vol 421 ◽  
pp. 229-234
Author(s):  
Maria Kapustova
Keyword(s):  
Plastic Flow ◽  
Cold Forging ◽  
Case Hardening ◽  
Numeric Simulation ◽  
Technological Test ◽  
Reduction Of Area ◽  
Warm Forging ◽  
The Given ◽  
Is Value ◽  
Main Factor

Warm forging is most commonly used for production of die forgings which are manufactured by means of precise forging. As compared to cold forging, warm forging enables to reduce forging forces size considerably. Development of warm forging technology is connected to formability and plasticity research of forged material at warm temperatures. This contribution brings a methodology for optimal forging temperature determination from recommended interval of warm temperatures used for chromium-manganic steel 16MnCr5. The given steel is appropriate for case hardening and precise die forgings production. For the purpose of verification of steel forgeability at the recommended interval of warm forging temperatures 600, 650, 700 and 750 °C technological test of upsetting according to Zidek is used. The main factor of plasticity for optimal warm temperature selection from examined temperature interval is value of reduction of area that was determined by tensile test. Numeric simulation of forging process in closed die confirmed correct plastic flow of steel 16MnCr5 at recommended forging temperature 700 degrees of Celsius.

scholarly journals Controlled outflow of storm water without flooding

2018 ◽  
Vol 168 ◽  
pp. 02001
Author(s):  
Karel Adámek ◽  
Jan Kolář ◽  
Pavel Peukert
Keyword(s):  
Numerical Simulation ◽  
Water Level ◽  
Flow Rate ◽  
Storm Water ◽  
Resistance Characteristic ◽  
The Given

There are many types of devices used for various purposes, called as vortex valves. The aim of this paper is the design of vortex valves, determined for controlled higher outflows from retention tanks. The paper follows the previous study of smaller sizes of vortex valves. The method of flow numerical simulation allows us to identify the reason of the two-branch operational (resistance) characteristic of the solved valves and the suitable sizes of the main valve dimensions for the given flow rate and water level.

Numerical Simulation and Optimization of Drill Pipe - Martian Soil Model

2013 ◽  
Vol 572 ◽  
pp. 613-616
Author(s):  
Hao Wen Xue ◽  
Zhen Song ◽  
Ju Fan Zhang ◽  
Sheng Yuan Jiang ◽  
Bing Li
Keyword(s):  
Numerical Simulation ◽  
Response Surface Methodology ◽  
Prediction Model ◽  
Drill Pipe ◽  
Sampling Device ◽  
Simulation And Optimization ◽  
Martian Soil ◽  
Drilling Parameters ◽  
Predicted Values ◽  
The Given

Modeling of drill pipe and optimization of its parameters are important in the design of drilling-sampling mechanism. The present study focused on the influence of drilling parameters on the excitement depth of Martian soil. A mathematical prediction model of the excitement depth of Martian soil was developed using response surface methodology (RSM). The effects of drill pipe parameters on the excitement depth of Martian soil were evaluated and optimum drill pipe parameters were determined using RSM. As a result, the predicted values and test values were quite close, which indicates that the developed model can be effectively used to predict the excitement depth of Martian soil. The given model could be utilized to select the level of drill pipe parameters. The efficiency of the sampling device will be improved by using this model.

Numerical simulation of air purging conditions during steel sheet temper rolling process

2017 ◽  
Vol 08 (01) ◽  
pp. 1750007 ◽  
Author(s):  
Siyu Dai ◽  
Yonglin Kang ◽  
Guoming Zhu ◽  
Xiaofei Zheng ◽  
Yuhui Wen
Keyword(s):  
Mechanical Properties ◽  
Numerical Simulation ◽  
Surface Quality ◽  
Working Conditions ◽  
Steel Sheet ◽  
Rolling Process ◽  
Simplified Model ◽  
Temper Rolling ◽  
Structured Grids

The application of the lubricant in the temper rolling process of tinplate manufacturing improves the mechanical properties and surface quality of the steel sheet. The removal of the residual lubricant deserves and has rarely been studied via numerical simulation. A simplified model of a single stand temper mill was established and was discretized into cells of block-structured grids. The criterion whether the lubricant could be removed was decided via multiphase simulation of a smaller model. Three parameters, the gap between the deflector and the rolls, the length of an additional baffle and the velocity of the purging air, were considered and scores of different working conditions were performed. The shapes of the steel sheet between the temper rolls and the bridle roll were also studied to screen out the conditions that the sheet could move steadily.

scholarly journals The Analysis of SEIRS-SEI Epidemic Models on Malaria with Regard to Human Recovery Rate

2017 ◽  
Vol 6 (3) ◽  
pp. 132-140
Author(s):  
Resmawan Resmawan ◽  
Paian Sianturi ◽  
Endar Hasafah Nugrahani
Keyword(s):  
Numerical Simulation ◽  
Fixed Point ◽  
Recovery Rate ◽  
Human Population ◽  
Equilibrium Points ◽  
Epidemic Models ◽  
Existence And Stability ◽  
Simulation Results ◽  
Model Formation ◽  
The Given

This article discusses SEIRS-SEI epidemic models on malaria with regard to human recovery rate. SEIRS-SEI in this model is an abbreviation of the population class used in the model, ie Susceptible, Exposed, Infected, and Recovered populations in humans and Susceptible, Exposed, and Infected populations in mosquito. These epidemic models belong to mathematical models which clarify a phenomenon of epidemic transmission of malaria by observing the human recovery rate after being infected and susceptible. Human population falls into four classes, namely susceptible humans, exposed humans, infected humans, and recovered humans. Meanwhile, mosquito population serving as vectors of the disease is divided into three classes, including susceptible mosquitoes, exposed mosquitoes, and infected mosquitoes. Such models are termed SEIRS-SEI epidemic models. Analytical discussion covers model formation, existence and stability of equilibrium points, as well as numerical simulation to find out the influence of human recovery rate on population dynamics of both species. The results show that the fixed point without disease ( ) is stable in condition  and unstable in condition . The simulation results show that the given treatment has an influence on the dynamics of the human population and mosquitoes. If the human recovery rate from the infected state becomes susceptible to increased, then the number of infected populations of both species will decrease. As a result, the disease will not spread and within a certain time will disappear from the population.

scholarly journals Modelling by Finite Element Analysis Method of Stress State Establishing for an Steel Alloy

2015 ◽  
Vol 3 ◽  
pp. 34
Author(s):  
Silviu Macuta ◽  
Mirel Istratescu
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Steel Alloy ◽  
Analysis Method ◽  
Pure Bending ◽  
Element Analysis ◽  
Bending Fatigue ◽  
Finite Element Analysis Method ◽  
Simulation Based

The paper presents some results about thetension state in samples subject to pure bending fatigue process. Numerical simulation based on finit elementmethod was used. The tension field induced by a verticaldeformation imposed at the sample ends was generatedon an original patented machine. The studies werecarried out on two steels currently used in pressurevessels industry. Experimental data are in good agreementwith the simulated ones.

scholarly journals On the Assessment of Surface Quality and Productivity Aspects in Precision Hard Turning of AISI 4340 Steel Alloy: Relative Performance of Wiper vs. Conventional Inserts

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2036 ◽  
Author(s):  
Adel T. Abbas ◽  
Magdy M. El Rayes ◽  
Monis Luqman ◽  
Noha Naeim ◽  
Hussien Hegab ◽  
...  
Keyword(s):  
Surface Quality ◽  
Feed Rate ◽  
Material Removal ◽  
Hard Turning ◽  
Removal Rate ◽  
Cutting Speed ◽  
Depth Of Cut ◽  
Steel Alloy ◽  
Aisi 4340 Steel ◽  
Aisi 4340

This article reports an experimental assessment of surface quality generated in the precision turning of AISI 4340 steel alloy using conventional round and wiper nose inserts for different cutting conditions. A three-factor (each at 4 levels) full factorial design of experiment was followed for feed rate, cutting speed, and depth of cut, with resulting machined surface quality characterized by resulting average roughness (Ra). The results show that, for the provided range of cutting conditions, lower surface roughness values were obtained using wiper inserts compared with conventional inserts, indicating a superior performance. When including the type of insert as a qualitative factor, ANOVA revealed that the type of insert was most important in determining surface roughness and material removal rate, with feed rate as the second most significant, followed by the interaction of feed rate and type of insert. It was found that using wiper inserts allowed simultaneous increases in feed rate, cutting speed, and depth of cut, while providing better surface quality of lower Ra, compared to the global minimum value that could be achieved using the conventional insert. These findings show that wiper inserts produce better surface quality and a material removal rate up to ten times higher than that obtained with conventional inserts. This clearly indicates the tremendous advantages of high surface quality and productivity that wiper inserts can offer when compared with the conventional round nose type in precision hard turning of AISI 4340 alloy steel.

The effect of boronizing heat treatment on the slurry erosion of AISI 5117

2018 ◽  
Vol 70 (7) ◽  
pp. 1176-1186 ◽  
Author(s):  
Yasser Abdelrhman ◽  
Ahmed Abouel-Kasem ◽  
Karam Emara ◽  
Shemy Ahmed
Keyword(s):  
Erosion Resistance ◽  
Surface Hardness ◽  
Impact Angle ◽  
Impact Factors ◽  
Case Hardening ◽  
Steel Alloy ◽  
Slurry Erosion ◽  
Content Type ◽  
Erosion Mechanism ◽  
Impact Angles

PurposeThis paper aims to clarify the relationship between the slurry erosion and one of the case hardening treatments, i.e. boronizing in this study, for AISI-5117 steel alloy. AISI-5117 steel alloy was used because of its variety applications in the field of submarine equipment. Most of the slurry erosion factors such as velocity, impact angle and mechanism of erosion were studied at different impact angles.Design/methodology/approachAt first, the samples were prepared and subjected to the boronizing treatment in controlled atmosphere. By using a slurry erosion test-rig, all experiments for studying the slurry erosion factors were carried out. Moreover, the studied specimens were investigated via scanning electron microscope, optical microscope and X-ray diffraction to study the erosion mechanism in the different conditions.FindingsIt was expected that the boronization of the AISI-5117 steel would increase its slurry erosion resistance due to its positive impact on the surface hardness. However, the results observed show the opposite, where the boronization of AISI-5117 steel decreased its slurry erosion resistance as implied by the increase of the mass loss percentage at all impact angles.Originality/valueThis research, for the first time, exhibits the effect of boronizing treatment on the slurry erosion in different impact factors accompanied by the erosion mechanism at each impact angle.

The Optimization of Vacuum Casting Filling Velocity Based on Numerical Simulation

2012 ◽  
Vol 522 ◽  
pp. 221-226
Author(s):  
Nan Nan Xu ◽  
Zhuang Ya Zhang ◽  
Hai Guang Zhang ◽  
Tian Lv ◽  
Yuan Yuan Liu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Casting Process ◽  
Optimization Method ◽  
Uniform Flow ◽  
Front Velocity ◽  
Flow Front ◽  
Filling Process ◽  
Vacuum Casting ◽  
Simulation And Optimization ◽  
The Given

In the process of vacuum casting, non-uniform flow front velocity about pouring material will lead to casting non-uniform shrinkage and warping deformation. Ideal filling pattern should make pouring material fill into the mold cavity with uniform flow front velocity. Give an optimization method of vacuum casting process, optimize the filling velocity in the filling process by combining numerical simulation and optimization method, and make the flow front velocity of pouring material uniform in the filling process, further reduce the warping deformation of casting. The example shows that the optimal model and the given solution algorithm is feasible.

Sign in / Sign up

Export Citation Format

Share Document