• 한국정밀공학회지
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• 제14권12호
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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.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 춘계학술대회 논문집
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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.

• 대한기계학회논문집A
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• 제21권11호
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• pp.1827-1836
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• 1997

In this paper, the clamping type forging of helical gears has been investigated. Clamping type forging is an operation in which the product is constrained to extrude sideways through an orifice in the container wall. Punch is cylindrical shaped. The punch compresses a cylindrical bilet placed in a die insetr. As a consequence the material flows in a direction perpendicular to that of punch movement. 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 introduce to re4present 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, friction factor and initial height of billet on the forging of helical gears. Some firgiing experiments were catrried out with aluminium 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.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1996년도 추계학술대회 논문집
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• pp.144-149
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• 1996

In this paper, the clamping type forging of helical gears has been investigated. Clamping type forging is an operation in which the product is constrained to extrude sideways through an orifice in the container wall. Punch is cylindrical shaped. The punch compresses a cylindrical billet placed in a die insert. As a consequence the material flows in a direction perpendicular to that of punch movement. 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, friction factor and initial height of billet on the forging of helical gears.