Numerical simulation and experimental study for the die forging process of a high-speed railway brake disc hub

2013 ◽  
Author(s):  
Mingyue Sun ◽  
Bin Xu ◽  
Long Zhang ◽  
Dianzhong LI
Keyword(s):  
Numerical Simulation ◽  
Experimental Study ◽  
High Speed ◽  
Brake Disc ◽  
High Speed Railway ◽  
Forging Process ◽  
Die Forging

Numerical Simulation Analysis on Cold Closed-Die Forging of Differential Satellite Gear in Car

2008 ◽  
Vol 575-578 ◽  
pp. 517-524 ◽  
Author(s):  
Yao Zong Zhang ◽  
Jian Bo Huang ◽  
Xue Lin ◽  
Quan Shui Fang
Keyword(s):  
Numerical Simulation ◽  
Simulation Analysis ◽  
Simulation Software ◽  
Bevel Gear ◽  
Cold Forging ◽  
Forging Process ◽  
Die Forging ◽  
Closed Die Forging ◽  
Forming Defects ◽  
Deform 3D

The cold closed-die forging process of the gear is a kind of new technique of the precise forming of gear in recent years. In this paper, the cold closed-die forging process of differential satellite gear in car was analyzed through numerical simulation method. Forming mold was designed with Pro/E Wildfire2.0 which included four components : upper punch, lower punch, tooth shape upper die and lower die for Normal Cone. The three-dimensional models of satellite bevel gear mould were built and imported into numerical simulation software DEFORM-3D. Because the gear has the uniform circumferential features, in order to save time and improve the accuracy, only one tooth was simulated, and the full simulation outcome of 10 teeth was mirrored from this one. Through the numerical simulation analysis of DEFORM-3D, the instantaneous deformation and stress filed were gained. Forming defects were forecasted and the cold closed-die forging rule for satellite gear used in car was obtained which can provide effective references for no-flash cold forging process of planet bevel gear and the mold design.

Numerical Simulation of Hot Die Forging Process of Ti-6Al-4V Alloy Blade

2017 ◽  
Vol 898 ◽  
pp. 1325-1331 ◽  
Author(s):  
Jia Hao Chen ◽  
Jin Shan Li ◽  
Bin Tang ◽  
Li Hua Du ◽  
Hong Chao Kou
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Stress Distribution ◽  
Strain Distribution ◽  
3D Finite Element ◽  
Forging Process ◽  
Die Forging ◽  
3D Finite Element Method ◽  
Deformation Area ◽  
Hot Die Forging

Ti-6Al-4V alloy is used extensively in aerospace industries due to its excellent properties. In this paper, the hot die forging process of the Ti-6Al-4V alloy blade was simulated by using 3D finite element method. Based on the model, the effect of process parameters on the deformation was investigated. The results show that the increase of temperature is beneficial to improving the uniformity of stress distribution. The slower the declining velocity of upper die is, the larger the strain gradient of severe deformation area will be. In addition, the stress distribution gets uniform with velocity decreasing. The large friction coefficient can make strain distribution uneven and cause symmetry of stress distribution. The proposed numerical simulation of hot die forging of blade in the present work may yield important information for the development of hot die forging techniques and the manufacture of blade.

An experimental study of the unbalance compensation by voltage source inverter based STATCOM

2016 ◽  
Vol 7 (1) ◽  
pp. 45
Author(s):  
Anas Benslimane ◽  
Jamal Bouchnaif ◽  
Mohamed Azizi ◽  
Khalid Grari
Keyword(s):  
Experimental Study ◽  
High Voltage ◽  
High Speed ◽  
Power Grid ◽  
Dynamic Regime ◽  
Voltage Source ◽  
Voltage Source Inverter ◽  
High Speed Railway ◽  
Reduced Scale

This work presents an experimental study of the unbalance compensation caused by the high speed railway substations in the high-voltage power grid with a shunt voltage source inverter based STATCOM. This experimental study is realized on a reduced scale prototype. The Control of inverter is implemented in a DSP card. The practical results presented in this paper are shown the performance of unbalance compensation by VSI_STATCOM in static and dynamic regime.

Simulation and Microstructure Predict during Hot Die-Forging of Cast Mg-7.0Al-0.2Zn Magnesium Alloy

2010 ◽  
Vol 152-153 ◽  
pp. 1293-1296
Author(s):  
Li Hong Wu
Keyword(s):  
Numerical Simulation ◽  
Aluminum Alloy ◽  
Magnesium Alloy ◽  
Strain Distribution ◽  
Forging Process ◽  
Die Forging ◽  
Comparison Results ◽  
Hot Die Forging ◽  
Good Agreement

Employing the dies for aluminum alloy parts, the hot die-forging forming and numerical simulation of semi-continuous casting Mg-7.0Al-0.4Zn (AZ70) were carried out. It was indicated that AZ70 has a worse fluidity during forging and is consequently difficult to fill fully compared to aluminum alloys. The microstructure of the AZ70 forgings is in good agreement with the strain distribution generated by simulation, and strain distribution can predict the microstructure evolution. The comparison results can give a guideline on developing forging process and controlling forgings quality of the AZ70 alloy.

On the fatigue design method for high-speed railway axles

2001 ◽  
Vol 215 (2) ◽  
pp. 73-82 ◽  
Author(s):  
K Hirakawa ◽  
M Kubota
Keyword(s):  
Fatigue Strength ◽  
High Speed ◽  
Fatigue Cracks ◽  
Fretting Fatigue ◽  
Brake Disc ◽  
Metal Fatigue ◽  
High Speed Railway ◽  
Fatigue Design ◽  
Railway Axle ◽  
The Press

Fatigue failure of the railway axle, which has been a source of difficulty for engineers since railroad service started in the early part of the nineteenth century, was the beginning of the study of metal fatigue. In order to maintain the safety of a high-speed railway system, a large number of investigations and experiments have been carried out by outstanding researchers ever since, and many improvements have been made in the material, manufacturing, heat treatment and design methods. In comparing Japan and Europe on the fatigue design philosophy of the high-speed railway axle, it is recognized that there is a difference between the Japanese Shinkansen and the European TGV and ICE. The critical parts for fatigue strength are the press-fitted parts which suffer from fretting fatigue damage, such as the wheel seat, gear seat and brake disc seat. In Europe, the larger diameter of the press-fitted part makes the fillet the critical part. In Japan, however, the fatigue strength of the press-fitted part is increased by an induction hardening method. Also, a stress-relief groove is made at the closely press-fitted part of the axle. For several years, no fretting fatigue cracks in Shinkansen axles have been detected by magnetic particle inspection. It is noted that improvements over many years have been successful in achieving the safety of high-speed railway axles. These problems will be studied in this paper.

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