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.

Effect of Mandrel Exchange on the Precision Forging of Spur Gear

2011 ◽  
Vol 295-297 ◽  
pp. 1635-1638
Author(s):  
Cheng Yang ◽  
Sheng Dun Zhao ◽  
Jian Jun Zhang
Keyword(s):  
Contact Pressure ◽  
Free Space ◽  
Spur Gear ◽  
Precision Forging ◽  
Tool Set ◽  
Deform 3D ◽  
Forging Load

In order to reduce the spur gear precision forging load and prevent load to rise sharply in final forging, on the basis of analysis the distribution of contact pressure of cylinder upsetting, mandrel exchange technology is put forward. As a result, the material always has free space to flow. The tool-set and experiment scheme are designed, finally, the scheme is further validated by Deform-3D, and the results show that the validity of mandrel exchange technology to reduce the load in gears precision forging.

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.

Bending Strength of Carburized Forged Spur Gear

2007 ◽  
Author(s):  
Masashi Yamanaka ◽  
Shinji Miwa ◽  
Katsumi Inoue ◽  
Yoshiki Kawasaki
Keyword(s):  
Fatigue Strength ◽  
Fatigue Test ◽  
Bending Strength ◽  
Surface Hardness ◽  
Spur Gear ◽  
Bending Fatigue ◽  
Precision Forging ◽  
Bending Fatigue Test ◽  
Bending Fatigue Strength ◽  
Gear Profile

This paper deals with the evaluation of influence of the manufacturing methods precision forging and conventional hobbing on the bending fatigue strength of carburized gears. The forging has advantages in productivity and strength. The forged gear has a continuous directed fiber flow which runs along the gear profile. To clarify the effect of strength enhancement, a bending fatigue test is performed for the forged and the hobbed gears. The material of test gears is SCr420H in the JIS and all gears are carburized. The electrohydraulic servo-controlled fatigue tester is used in the constant stress-amplitude fatigue test. The strength is expressed by the fillet stress level, which is calculated by FEM. The obtained strengths of forged and hobbed gear are 1613 MPa and 1490 MPa, respectively. The strength of forged gear is increased 8% in comparison with that of the hobbed gear. The surface hardness is higher and the surface roughness is smaller in the forged gear, however, the residual stress is approximately same. The effect of improvement of the roughness by forging on the strength is small in 1%, and the main reason of the improvement of fatigue strength is considered as the continuous fiber flow.

Study on the Large Module Spur Gear Cold Forming Process by Means of Numerical Simulation

2011 ◽  
Vol 189-193 ◽  
pp. 2642-2646 ◽  
Author(s):  
Qian Li ◽  
Yi Bian ◽  
Zhi Ping Zhong ◽  
Gui Hua Liu ◽  
Ying Chen
Keyword(s):  
Numerical Simulation ◽  
Simulation Method ◽  
Spur Gear ◽  
Cold Forging ◽  
Forming Process ◽  
Cold Forming ◽  
Forging Process ◽  
Flow Method ◽  
Precision Forging ◽  
Cold Precision Forging

The cold forging process of large module spur gear with four modules and 59mm breadth is performed by means of numerical simulation method. Two processes to forming such spur gears were compared by the simulation method, one is with the closed-die performing and extrusion in the finish-forging, the other is with divided-flow method in the finish-forging. Especially, the divided-flow method is analyzed in detail. The necessary reference and basis to realize practical cold precision forging process of spur gear with large modulus is provided eventually.

Study on Precision Forging Schemes of Hypoid Driving Gear

2012 ◽  
Vol 472-475 ◽  
pp. 692-695
Author(s):  
Jian Hua Wang ◽  
Fu Xiao Chen
Keyword(s):  
Equivalent Stress ◽  
Three Dimensional ◽  
Equivalent Strain ◽  
Precision Forging ◽  
Forming Technology ◽  
Blank Shape ◽  
Simulation Results ◽  
Three Dimensional Models ◽  
3D Software ◽  
Deform 3D

By analyzing the characteristics and forming technology of hypoid driving gear, it was suitable for adopting fully enclosed die forging principle to form the gear. Based on different forging methods, three kinds of blank shape and corresponding forming schemes were designed. The three dimensional models of blank and die were created by the UG software. The three forming schemes were simulated by the Deform-3D software. The simulation results of distribution of equivalent stress, distribution of equivalent strain and load-stroke curve were comparatively analyzed. Then the most reasonable scheme was chosen. At last, the rationality of numerical simulation can be further verified by the optimized scheme was proved by experiment.

Effects of Friction on Precision Forging Process of Blade with a Damper Platform

2007 ◽  
Vol 561-565 ◽  
pp. 831-834 ◽  
Author(s):  
Yu Li Liu ◽  
He Yang ◽  
Tao Gao
Keyword(s):  
High Efficiency ◽  
Metal Flow ◽  
Vibration Characteristic ◽  
Technological Parameters ◽  
Forging Process ◽  
Precision Forging ◽  
Blade Forging ◽  
Deformation Defects ◽  
3D Software ◽  
Deform 3D

A blade with a damper platform, with excellent anti-vibration characteristic and high efficiency, has become one of the most important types of blades being developed in the aeronautical engines. During the precision forging process of this blade, the friction between dies and workpiece has important effects on metal flow, deformation defects, load and energy etc. So researching the effects of friction conditions on the forging process of blade with a damper platform has been a crucial problem urgent to be resolved. In this paper, the precision forging process of titanium alloy blade with a damper platform under different friction conditions has been simulated and analyzed based on the DEFORM-3D software platform. The obtained results reveal the influence laws of friction on temperature field and load-stroke curves, and provide a significant basis for determining technological parameters of the blade forging process.

scholarly journals Volume calculation of the spur gear billet for cold precision forging with average circle method

2014 ◽  
Vol 1 (4) ◽  
pp. 456-462 ◽  
Author(s):  
Wangjun Cheng ◽  
Chengzhong Chi ◽  
Yongzhen Wang ◽  
Peng Lin ◽  
Wei Liang ◽  
...  
Keyword(s):  
Circle Method ◽  
Spur Gear ◽  
Volume Calculation ◽  
Precision Forging ◽  
Cold Precision Forging

Precision Forging of Casting AZ31 Magnesium Inner Spur-Gear

2006 ◽  
Vol 532-533 ◽  
pp. 13-16
Author(s):  
Hong Bo Li ◽  
Mu Huang ◽  
Jun Ting Luo ◽  
Jun Zhao
Keyword(s):  
Grain Size ◽  
Magnesium Alloy ◽  
Deformation Process ◽  
Spur Gear ◽  
Az31 Magnesium Alloy ◽  
Warm Deformation ◽  
Forming Load ◽  
Precision Forging ◽  
Forming Technology

Based on the two-stage forming technology, the casting AZ31 Magnesium alloy bar was forged into cylindrical straight inner gear between the temperature 250°C-400°C. At 250°C, the teeth of the inner gear are almost formed. But there are some cyclic cracks on the surface of the sample. When improving the temperature above 300°C, the surface quality of the sample has greatly improved. According to the result of this experiment, the best temperature range for forging AZ31 magnesium gear is 280°C to 380°C.The forming load gradually reduced with the temperature improved. At 250°C, the forming load is 93t. At the 400°C, the forming load reduces to 80t.The initial grain size of AZ31 magnesium alloy bar is 22μm. The microstructure evolution during the warm deformation was observed by optical microscopy (OM). It is demonstrated that the grain refinement happened during the deformation process.

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