• Journal of the Korean Society for Precision Engineering
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• v.14 no.12
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• pp.105-113
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• 1997

In this study, the forging process of spur gears has been investigated. The forging process of spur gears has been classified into two type of operations, guiding one and clamping one in this investigation. Two type forgings of spur gears have been analysed by using upper bound method. The predicted values of the forging load were compared with those obtained from the forging experiments. The forging experiments were carried out with a commercial aluminium alloy. The forged parts obtained through the guiding type forging were campared with those obtained through the clamping type forging.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1997.04a
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• pp.1015-1019
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• 1997

In this study, the forging process of spur gears has been investigated. The forging peocess of spur gears has been classified into two type of operations, guiding one and clamping one in this investigation. Two type forgings of spur gears have been analysed by using upper bound method. The predicted values of the forging load were compared with those obtained from the forging experiments. The forging experiments were carried out with a commerial aluminium alloy. The forged parts obtained through the guiding type forging were campared with those obtained through the clamping type forging.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.21 no.9
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• pp.1364-1372
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• 1997

In this paper, the forging of helical gears has been investigated. Punch is tooth-shaped as is the die insert. The punch compresses a cylindrical billet placed in a die insert. As a consequence the material of billet flows into the tooth region. The forging has been analysed by using the upper-bound method. A kinematically admissible velocity field has been developed, wherein, an involute curve has been introduced to represent tooth profile of the gear. Numerical calculations have been carried out to investigate the effects of various parameters, such as module, number of teeth, helix angle and friction factor on the forging of helical gears. Some forging experimentswere carried out with aluminum alloy to show the validity of the analysis. Good agreement was found between the predicted values of the forging load and obtained from the experimental results.