Study on a new technological scheme for cold forging of spur gears

Hu, Chen; Wang, Kesheng; Quan-kun, Liu

doi:10.1016/j.jmatprotec.2006.11.037

Cited by 30 publications

(20 citation statements)

References 2 publications

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“…The forming laws of the workpiece can be predicted. The numerical simulation is a powerful tool for the processes and dies design [7][8][9]. In recent years, it is the developing trend of metal forming technology to use advanced methods, such as numerical simulation, to solve the problem in industry.…”

Section: Introductionmentioning

confidence: 99%

Process Design for Cold Precision Forging of Bevel Gear

Zhang

Cui

Wang

2010

2010 International Conference on Digital Manufacturing &Amp; Automation

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Precision forging is defined as a near net-shape forging operation which generates high quality parts concerning surface quality and dimensional accuracy. In particular gears offer a wide application field for the precision forging technology. Advantages like shortened production cycles achieved by eliminating machining operations and the saving of raw material contribute to the ongoing cost-saving trend in the industry. This article describes the adopted methods and the precision forging process of the bevel gear. 3D FEM model of the precision forging process of bevel gear was established. The forming laws, material plastic behavior, changed geometries and the qualities of the gears are explored by finite element simulation. Completely filled gear teeth were obtained using a lower forging load by the designed process which is the effective forging process for manufacturing of bevel gear. The design process for bevel gear has to be purpose-built to consider the distinctions of this precision forging technique.

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Section: Introductionmentioning

confidence: 99%

Process Design for Cold Precision Forging of Bevel Gear

Zhang

Cui

Wang

2010

2010 International Conference on Digital Manufacturing &Amp; Automation

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“…Due to the high forming load required in precision gear forging [7], researchers have focused on different structures and shapes in designs of tools in order to reduce forming load. The benefits of low forging force include low distortion, improved dimensional accuracy, and long tool life [8].…”

Section: Introductionmentioning

confidence: 99%

An investigation of involute and lead deflection in hot precision forging of gears

Zuo

Wang

Zhi

et al. 2016

Int J Adv Manuf Technol

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A theoretical model is presented in the paper for predicting involute profile deflection in hot precision forging of gears. This model is a function of a number of material and processing parameters, including the thermal expansion of the die, thermal contraction of workpiece, elastic expansion of the die during forging, and workpiece recovery after ejection. To improve the accuracy of the hot forged gear tooth, an equation set to define modified involute that is used to design the die tooth has been proposed based on the model. The distribution of deflection along the involute was also predicted using the commercial FE code, PRO-E. The deflection characteristic of the toothed die through the tooth width was analyzed by combining the theoretical method and FEM to investigate the nonuniform deflection. The dimension of the forged gears was measured using a gear measurement machine WGT3000. A close agreement between predicted and measured tooth involute profiles was obtained, which validated the involute deflection prediction model. The measured lead error also verified the model for deflection non-uniformity through the tooth width. The results can provide a guide for die tooth designs to improve the dimensional accuracy of hot forged gear teeth.

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“…The influences of different designs on the metal flow and load requirements through experiments and finite element simulation are investigated to reduce the forming force and improve the forming quality [7]. A new technological scheme for the cold forging of spur gears, in which the punch and bottom end faces are changed in order to lower the forming load, has been investigated by Hu et al [8]. And they proposed a hypothesis of radial rigid-parallel-motive (RPM) flow mode, based on the RPM mode a novel specific gear forging technology is put forward by introduced upend forging process and constrained divided-flow technique.…”

Section: Introductionmentioning

confidence: 99%