Study on the influencing factors of the deformation in the process of gear shaping

Abstract Ring gear is an important part of high-power transmission system. Because of its thin wall and low stiffness, it is easy to produce deformation in the process of gear shaping, which affects its accuracy. In order to ensure the machining quality of gear shaper, this research focuses on the typical material 42CrMo, which is used in the gear ring of automobile gearbox. Through the finite element simulation and actual test, the influence of gear shaper cutting parameters on the deformation of gear ring is studied. The results show that the influence of the main cutting parameters on the deformation of the ring gear is in the order of radial feed, circumferential feed, stroke speed and cutting depth. In the actual gear shaping process, the cutting parameters can be adjusted according to the deformation law of 42CrMo workpiece in the gear shaping process, so as to control the deformation of gear ring.

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The optimization of friction disc gear-shaping process aiming at residual stress and machining deformation

REVIEWS ON ADVANCED MATERIALS SCIENCE ◽

10.1515/rams-2021-0069 ◽

2021 ◽

Vol 60 (1) ◽

pp. 921-935

Author(s):

Hanjun Gao ◽

Xin Li ◽

Qiong Wu ◽

Wanhao Zhang ◽

Guowen Dai ◽

...

Keyword(s):

Residual Stress ◽

Fatigue Life ◽

Cutting Parameters ◽

Surface Residual Stress ◽

Machining Deformation ◽

Shaping Process ◽

Comprehensive Performance ◽

Friction Disc ◽

Bottom Face ◽

Gear Shaping

Abstract Friction disc is the key part of the frictional clutch. But there is a lack of in-depth studies on the effect of the cutting parameters on residual stress and machining deformation. In this study, the simulation model for friction disc gear shaping was established and the effect of the typical cutting parameters on surface residual stress and machining deformation was studied. Based on the study’s results, the optimization experiment of friction disc gear shaping was carried out and a method was proposed to reduce machining deformation and to improve the fatigue life. Applying the proposed method, the residual stress on the tooth bottom increased from −122.50 to −371.33 MPa, an increase of 203.13% that increases the fatigue life greatly. Meanwhile, the front and bottom face deformation of the outer ring as well as the deformation of the front and bottom tooth tip can be decreased effectively. This study can provide technical support for improving the comprehensive performance of the friction disc and transmission system.

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Global experience of HVDC composite insulators in outdoor and indoor environment

REVIEWS ON ADVANCED MATERIALS SCIENCE ◽

10.1515/rams-2020-0050 ◽

2020 ◽

Vol 59 (1) ◽

pp. 606-618

Author(s):

Mohammad Akbar ◽

Basharat Mehmood

Keyword(s):

High Voltage ◽

Direct Current ◽

Transmission Lines ◽

Power Transmission ◽

Green Energy ◽

Attractive Alternative ◽

Hvdc Transmission ◽

Ceramic Insulators ◽

High Power Transmission ◽

Aging Performance

AbstractHigh-voltage direct current (HVDC) transmission is known as green-energy transfer technology and has recently become an attractive alternative of high-voltage alternating current (HVAC) due to its high-power transmission capability and lower power loss. Use of composite insulators on direct current (DC) transmission lines experienced rapid growth in recent years due to their high hydrophobicity and better performance in contaminated environment than conventional ceramic insulators. During their service operation on DC lines, insulators are prone to more accumulation of contaminants due to unidirectional electric field. The contaminants under wet conditions allow leakage current to flow on the insulator surface. Being organic in nature, polymeric insulators have a tendency to age under the combined effects of electrical and environmental stresses. To fully understand the long-term aging performance of DC composite insulators, a detailed survey was considered necessary. Towards that end, this paper critically summarizes worldwide experience of aging performance of composite insulators in the field as well as in laboratory conditions.

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Topology optimization of metamaterial microstructure for wireless power transfer with high power transmission efficiency

Journal of Magnetism and Magnetic Materials ◽

10.1016/j.jmmm.2021.168228 ◽

2021 ◽

pp. 168228

Author(s):

Pengfei Shi ◽

Yu Qin ◽

Yangyang Cao ◽

Hongge Zhao ◽

Renjing Gao ◽

...

Keyword(s):

Topology Optimization ◽

High Power ◽

Power Transmission ◽

Wireless Power Transfer ◽

Transmission Efficiency ◽

Power Transfer ◽

Wireless Power ◽

High Power Transmission

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The Research on Natural Characteristic and Eigensensitivity of Ravingneaux Compound Planetary Gear Sets

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.446-447.590 ◽

2013 ◽

Vol 446-447 ◽

pp. 590-596

Author(s):

Bo Qian ◽

Shi Jing Wu

Keyword(s):

Natural Frequency ◽

Planetary Gear ◽

Torsional Stiffness ◽

Ring Gear ◽

Vibration Model ◽

Planetary Gear Sets ◽

Planet Gear ◽

Natural Characteristic ◽

Gear Ring ◽

The Moment

The dynamic model of Ravingneaux compound planetary gear sets has been built. Then the Natural frequency and vibration model have been solved in the Ravingneaux compound planetary gear sets. The eigensensitivity to parameters have been researched based on the dynamical model. The varying trend of natural frequency according to the varying of parameters have been researched, which include gear mass (sun gear, ring gear , or planet gear), the moment of inertia of gears, the support stiffness , the torsional stiffness.

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Finite Element Simulation and Experimental Study on Blow Forming of Plastic Cups

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.148-149.1319 ◽

2011 ◽

Vol 148-149 ◽

pp. 1319-1322

Author(s):

Xiao Hu ◽

Yi Sheng Zhang ◽

Hong Qing Li ◽

De Qun Li

Keyword(s):

Finite Element ◽

Thickness Distribution ◽

Viscoelastic Model ◽

Engineering Practice ◽

Fe Model ◽

Thin Wall ◽

Forming Process ◽

Element Simulation ◽

Physically Based ◽

Set Up

Blow forming process of plastic sheets is simple and easy to realize, thus, it is widely used for plastic thin-wall parts. In the practical production, an effective method is needed for the preliminary set-up of process parameters in order to achieve accurate control of thickness distribution. Thus, a finite element method (FEM) code is used to simulate blow forming process. For better description of complex material theological characteristics, a physically based viscoelastic model (VUMAT forms Buckley model) to model the complex constitutive behavior is used. Nonlinear FE analyses using ABAQUS were carried out to simulate the blow forming process of plastic cups. The actual values at different locations show a satisfactory agreement with the simulation results: as a matter of fact the error along the cell mid-section did not exceed 0.02 mm on average, corresponding to 5% of the initial thickness, thus the FE model this paper can meet the requirements of the engineering practice.

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