scholarly journals Improvement of Die Corner Filling of Stepped Tubes Using Warm Hybrid Forming

2019 ◽  
Vol 32 (4) ◽  
Keyword(s):  
Corner Filling

Claw-Pole Closed Forging Process

2014 ◽  
Vol 912-914 ◽  
pp. 605-608 ◽  
Author(s):  
Xuan Rong Xin ◽  
Ding Xu ◽  
Cheng Song He ◽  
Xin Cheng Liu
Keyword(s):  
Mass Production ◽  
New Technology ◽  
Extrusion Process ◽  
Forming Force ◽  
Short Life ◽  
Forging Process ◽  
New Process ◽  
Corner Filling ◽  
Hot Die Forging ◽  
Deform 3D

Aimed at the present domestic problems in the forging process of claw pole, such as insufficient corner filling, excessive forming force and short life of dies. On the basis of the analyzing in the claw pole, a new process named the closed hot die forging, direct extrusion process of claw pole is constituted. The numerical simulation using DEFORM-3D and the special mould are used in the forging experiment in order to check the new process. The results show that, new technology has greatly reduced the forming force, thereby reducing the production processes and improving the life of dies for mass production.

Effect of Floating Die on Tooth Filling of Spur Gear Forging

2011 ◽  
Vol 295-297 ◽  
pp. 1631-1634
Author(s):  
Cheng Yang ◽  
Sheng Dun Zhao
Keyword(s):  
Radial Direction ◽  
Spur Gear ◽  
Friction Condition ◽  
Precision Forging ◽  
Corner Filling ◽  
Deform 3D ◽  
Motion Mode

According to the analysis of friction distribution on radial direction in the precision forging spur gear, the reason that the tooth corner was difficult to fill is revealed. Changing the motion mode of the floating die will change the friction condition between billet and floating die, as well as the filling situation of tooth corner. Finally, the scheme was further validated by DEFORM-3D, and the results show that the validity of floating die to tooth corner filling.

Mechanism of improvement of die corner filling in a new hydroforming die for stepped tubes

2009 ◽  
Vol 30 (9) ◽  
pp. 3824-3830 ◽  
Author(s):  
M. Elyasi ◽  
M. Bakhshi-Jooybari ◽  
A. Gorji
Keyword(s):  
Corner Filling

Investigation of thickness variation and corner filling in tube hydroforming

2003 ◽  
Vol 133 (3) ◽  
pp. 287-296 ◽  
Author(s):  
G.T. Kridli ◽  
L. Bao ◽  
P.K. Mallick ◽  
Y. Tian
Keyword(s):  
Tube Hydroforming ◽  
Thickness Variation ◽  
Corner Filling

Progress on High Pressure Pneumatic Forming and Warm Hydroforming of Titanium and Magnesium Alloy Tubular Components

2014 ◽  
Vol 783-786 ◽  
pp. 2456-2461 ◽  
Author(s):  
Gang Liu ◽  
Yong Wu ◽  
Jian Long Wang ◽  
Wen Da Zhang
Keyword(s):  
High Pressure ◽  
Temperature Field ◽  
Magnesium Alloy ◽  
Thickness Distribution ◽  
Expansion Ratio ◽  
Mg Alloy ◽  
Ti Alloy ◽  
Warm Hydroforming ◽  
Corner Filling ◽  
Tubular Components

Complex structural tubular components of Titanium and Magnesium alloy can be obtained at a certain temperature by high pressure pneumatic forming (HPPF) with gas medium or warm hydroforming with pressurized liquid medium. At 800°C, through experimental research on HPPF of TA18 Ti-alloy tube with expansion ratio of 50%, the influence of axial feeding on thickness distribution of the workpiece was studied. Using reasonable loading curve, the component with large ratio can be formed with a small thinning ratio as 13% with total axial feeding amount of 40mm. At 850°C, HPPF experiments of TA18 Ti-alloy component with square section were carried out. The influence of gas pressure on thickness distribution and corner filling process were analyzed. The larger the pressure, the sooner the displacement changes at the corner, and the shorter corner filling term. At pressure of 30 MPa, small corner with the relative corner radius of 2.0 can be obtained within 168s. For Mg-alloy tubular part, warm hydroforming with non-uniform temperature field was studied. By using reasonable axial temperature field and loading path, the maximum thinning ratio of Mg-alloy tubular component with expansion ratio of 35% was reduced from 21.6% to 11.6%.

On Numerical Simulations of the Micro-Gears and their Cold Forging Process

2009 ◽  
Vol 419-420 ◽  
pp. 17-20
Author(s):  
Chin Yu Wang ◽  
Hsin Te Wang
Keyword(s):  
Spline Function ◽  
Simulation Software ◽  
Cold Forging ◽  
Design Parameters ◽  
Forging Process ◽  
Gear Design ◽  
Cubic Spline Function ◽  
Corner Filling ◽  
Gear Profile ◽  
Parametric Cubic Spline

In this paper, a parametric cubic spline function for generating gear profile is proposed. The spline function includes new gear design parameters such as pressure angle, number of teeth, module, and tooth tip circle modification. The proposed geometry can improve corner filling condition. Finally, the simulation software DEFORM is used to simulate the cold forging process of the micro-gears with different profiles.

The Boundary Smoothing in Discrete Topology Optimization of Structures

2013 ◽  
Author(s):  
Hong Zhou ◽  
Shabaz Ahmed Mohammed
Keyword(s):  
Topology Optimization ◽  
Design Domain ◽  
Discrete Topology ◽  
Corner Cutting ◽  
Outer Corner ◽  
Material State ◽  
Corner Filling ◽  
Boundary Smoothing ◽  
Design Cell

In discrete topology optimization, material state is either solid or void and there is no topology uncertainty caused by intermediate material state. A common problem of the current discrete topology optimization is that boundaries are unsmooth. Unsmooth boundaries are caused by corners in topology solutions. Although the outer corner cutting and inner corner filling strategy can mitigate corners, it cannot eliminate them. 90-degree corners are usually mitigated to 135-degree corners under the corner handling strategy. The existence of corners in topology solutions is because of the subdivision model. If regular triangles are used to subdivide design domains, corners are inevitable in topology solutions. To eradicate corner from any topology solution, a subdivision model is introduced in this paper for the discrete topology optimization of structures. The design domain is discretized into quadrilateral design cells and every quadrilateral design cell is further subdivided into triangular analysis cells that have a curved hypotenuse. With the presented subdivision model, all boundaries and connections are smooth in any topology solution. The proposed subdivision approach is demonstrated by two discrete topology optimization examples of structures.

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