Deformation Mechanism of the Tooth Material Filling for Precision Forging of Spur Gears

2021 ◽  
pp. 1077-1086
Author(s):  
Wei Feng ◽  
Zengjie Feng ◽  
Mengjuan Zhou ◽  
Ling Mao ◽  
Xiangyang Jia
Keyword(s):  
Deformation Mechanism ◽  
Spur Gears ◽  
Precision Forging

INVESTIGATION OF LOAD ADAPTED GEARS AND SHAFTS MANUFACTURED BY COMPOUND-FORGING

2008 ◽  
Vol 07 (01) ◽  
pp. 175-182 ◽  
Author(s):  
BERND-ARNO BEHRENS ◽  
MARCUS BISTRON ◽  
ARMIN KUEPER ◽  
KAI MOEHWALD
Keyword(s):  
Surface Layer ◽  
Material Properties ◽  
Bulk Material ◽  
Manufacturing Technology ◽  
Spur Gears ◽  
Wear Resistant ◽  
Precision Forging ◽  
Near Net Shape ◽  
Gear Wheels ◽  
High Output

The demand for economic processes concerning manufacturing technology, cycle time and material properties has led to the development of near net-shape techniques. Precision forging is a well-known manufacturing technology to achieve high output rates. An approach of optimization concerning the part material to produce load-adapted material properties is the so-called compound-forging. Therefore, two different alloys are forge-welded together. Non-tempering and tempering steels are used to compound-forge gears with a hard and wear-resistant surface layer as well as a ductile bulk material. Compound-forging was developed to forge spur gears and shall now be introduced to manufacture helical gears and shafts. For the production of gears and shafts billets made from non-tempering steels are forge-welded together with billets consisting of tempering steels by precision forging as well as indirect impact extrusion. In this paper, the comparison of the material properties of compound-forged gear wheels and shafts with a hard and wear resistant surface layer and a ductile bulk material is given. Mechanical properties as well as the micro-structure of the parts were investigated. The results of the investigations show a load-adapted material distribution of forge-welded materials for the production of gears and shafts.

Investigation of Precision Forging Process of Spur Gears: Numerical Analysis and Experiments

2011 ◽  
Vol 341-342 ◽  
pp. 265-270
Author(s):  
M. Zadshakoyan ◽  
E.Abdi Sobbouhi ◽  
H. Jafarzadeh
Keyword(s):  
Numerical Analysis ◽  
Effective Strain ◽  
Spur Gear ◽  
Model Material ◽  
Optimum Number ◽  
Spur Gears ◽  
Specific Pressure ◽  
Rigid Plastic ◽  
Forging Process ◽  
Precision Forging

In this study, the precision forging process of spur gears has been investigated by means of numerical analysis. The effect of some parameters such as teeth number and module on the forming force and specific pressure were presented. The simulation works were performed rigid-plastic finite element method using DEFORM 3D software. In order to validate the estimated numerical results, they were compared with those obtained experimentally during precision forging of spur gear using lead as a model material. Results showed that the optimum number of gear teeth is between 10 to 20, that is because of being the specific pressure in its minimum value. Also the results obtained from analyzing the effective strain distribution showed that the maximum strain is located on the root area of the teeth. The work presented in this paper might be used for basic data in the design of the precision forging process.

Precision forging straight and helical spur gears

1994 ◽  
Vol 45 (1-4) ◽  
pp. 25-30 ◽  
Author(s):  
M.H. Sadeghi ◽  
T.A. Dean
Keyword(s):  
Spur Gears ◽  
Precision Forging

Finite Element Analysis and Optimization of Deformation Behavior for Spur Gear Warm Forging Process

2010 ◽  
Vol 148-149 ◽  
pp. 854-858
Author(s):  
Shu Bo Xu ◽  
Cai Nian Jing ◽  
Ke Ke Sun ◽  
Guo Cheng Ren ◽  
Gui Qing Wang
Keyword(s):  
Finite Element ◽  
Spur Gear ◽  
Spur Gears ◽  
Element Analysis ◽  
Helical Gears ◽  
Forging Process ◽  
Precision Forging ◽  
Die Forging ◽  
Closed Die Forging ◽  
Warm Forging

Recent years have therefore seen growing interest in gear precision forging to net-shape form of forge bevel, spur and helical gears, as an alternative to conventional manufacturing. In this paper, gear precision forging processes are simulated by using metal forming finite element code DEFORM-3D. The investigations of gear precision forging processes are conducted with perform forging and final forging processes. The processes of completely closed-die forging, moving-die forging and central divided flow forging processes are investigated for spur gears. The effect of different processes on the distribution of effective stress in the workpieces and forging loads are given. The purpose of this study is to introduce a new method, a so-called floating-relief method which applied to the forging of spur gears. It indicated that the flowing properties of the gear billet have a higher improve than that of conventional forging process. And the forging load obtained by using this new precision forging technology is decline sharply. The floating-relief method for gear precision forging is a sound process in the practical application.

scholarly journals A simplified formula for determination of relative pressure in the precision forging of spur gears

2021 ◽  
Vol 9 (2) ◽  
Author(s):  
Omer Eyercioglu ◽  
◽  
Necip F. Yılmaz F. Yılmaz ◽  
Keyword(s):  
Experimental Studies ◽  
Relative Pressure ◽  
Spur Gears ◽  
Upper Bound Method ◽  
Complete Filling ◽  
Precision Forging ◽  
Corner Filling ◽  
Suggested Formula ◽  
Simplified Formula

In this study, the relative forging pressures of spur gears were evaluated. The precision forging of spur gears was analyzed by using the upper bound method considering corner filling and bulging effect. Numerical and experimental studies were performed to investigate the effects of various parameters, such as the number of teeth, modules, facewidth, bore diameter, and friction factor on the relative forging pressure of spur gears. The results were compared with the previous studies and a simplified formula was suggested to predict the relative pressure of precision forging of spur gears. The predicted relative forging pressures obtained by the suggested formula are shown much closer to the experimental results for the complete filling of the die cavity.

Three-Dimensional Numerical Simulation and Forming Investigation for Net-Shape Forging of Spur Gears

2010 ◽  
Vol 139-141 ◽  
pp. 626-629
Author(s):  
Shu Bo Xu ◽  
Cai Nian Jing ◽  
Gui Qing Wang ◽  
Guo Cheng Ren
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Spur Gear ◽  
Systematic Investigation ◽  
Spur Gears ◽  
Stress Distributions ◽  
Forging Process ◽  
Precision Forging ◽  
Finite Element Numerical Simulation ◽  
Forging Die

In this paper, a new precision forging technique composite processing of the moving-die forging and divided flow forging process to form the spur gear is introduced. A systematic investigation of the floating-relief method process is performed by using finite element numerical simulation. The stress distributions on the workpieces were obtained. The closer the die teeth corner is, the higher stress value results can be acquired. And the effective stress is concentrated in spur gears forging die cavity corner. It was found that the floating-relief method forging process with upper and lower convex punches control the material flow effectively and the tooth cavity is filled successfully during the performing forging and final forging. The proposed method can serve as preconditions to analyze the abrasion and fatigue of spur gears forging die. The obtained results can offer valuable guidelines for gear precision forging experiments and practical process planning.

Group session B. Precision forging

1961 ◽  
Vol 40 (6) ◽  
pp. 416
Author(s):  
I.B. King
Keyword(s):  
Group Session ◽  
Precision Forging
Sign in / Sign up

Export Citation Format

Share Document