scholarly journals Residual Stress and Deformation Analysis in Machining Split Straight Bevel Gears

2021 ◽  
Vol 67 (3) ◽  
pp. 114-122
Author(s):  
Bin Wang ◽  
Chenxiao Yan ◽  
Jubo Li ◽  
Peiyao Feng ◽  
Shuaipu Wang ◽  
...  
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Internal Stress ◽  
Material Design ◽  
Bevel Gear ◽  
Machining Process ◽  
Deformation Analysis ◽  
Bevel Gears ◽  
Straight Bevel Gear ◽  
Deformation Law

In the machining of split straight bevel gears, the stiffness changes and internal stress are redistributed, which leads to serious deformation of the gear blank after machining. To rectify this problem, q finite element model is established by transforming the processing information of the gear blank into the finite element simulation calculation information, and the gear machining simulation of split straight bevel gear is carried out. Considering the material, design, and machining process of the gear blank, the characteristics and laws of internal stress variation during the gear machining are studied, and the internal mechanism and deformation law of split straight bevel gear are explored. Finally, the gear machining experiment, and the gear blank measurement are carried out. The results show that the deformation law of simulation is consistent with that of the experiment and the deformation characteristics of the split straight bevel gear are consistent with the change law of initial residual stress.

FEM Simulation of the Effects of Residual Stress on Deformation of Gyroscope Frame

2010 ◽  
Vol 439-440 ◽  
pp. 838-841
Author(s):  
Jun Zhan ◽  
Gui Min Chen ◽  
Xiao Fang Liu ◽  
Qing Jie Liu ◽  
Qian Zhang
Keyword(s):  
Finite Element Method ◽  
Residual Stress ◽  
Finite Element ◽  
Stress Distribution ◽  
Tensile Stress ◽  
Large Deformation ◽  
Deformation Process ◽  
Fem Simulation ◽  
Machining Process ◽  
The Core

Gyroscope is the core of an inertia system and made by machining process. Machining process imports large residual stress. The residual stress will be released and induces large deformation of gyroscope frame. In this paper, the effects of residual stress on deformation of gyroscope frame were simulated by finite element method. Different stress distribution leads different deformation. Compressive stress can make sample long and tensile stress make sample short. The stress released in deformation process which reduced about 90%.

scholarly journals Prediction of machining deformation and reasonable design of gear blank for split straight bevel gear

2021 ◽  
Author(s):  
Bin Wang ◽  
Chenxiao Yan ◽  
Peiyao Feng ◽  
Shuaipu Wang ◽  
Shuo Chen ◽  
...  
Keyword(s):  
Calculation Model ◽  
Bevel Gear ◽  
Geometric Parameters ◽  
Machining Process ◽  
Additional Stress ◽  
Element Analysis ◽  
Bending Deformation ◽  
Straight Bevel Gear ◽  
Machining Deformation ◽  
The Moment

Abstract The deformation of gear blank is serious in the machining process of the split straight bevel gear,considering the material and the design of gear blank, the relationship between the change of additional stress and bending deformation of gear blank is studied, and the calculation model of the internal additional stress and additional torque during the gear cutting is established.According to the moment-area method, the calculation formula of the bending deformation of gear blank is derived, and combined with the time-varying stiffness, the mathematical model of the gear blank deformation is obtained. The theoretical calculation, finite element analysis and experimental results are highly consistent.Based on the above research, the internal relationships between the machining deformation and the geometric parameters such as the thickness, diameter and gear module of the split gear blank is analyzed, and the reasonable design of the geometric parameters of the split gear blank and the reasonable dividing law of the gear blank are explored.

General Plate Formula for Bevel Gears with Back Shoulder

1985 ◽  
Vol 9 (3) ◽  
pp. 131-136
Author(s):  
E.M. Al-Shareedah ◽  
T.F. Lehnhoff
Keyword(s):  
Finite Element ◽  
Finite Element Modelling ◽  
Gear Tooth ◽  
Bevel Gear ◽  
Energy Approach ◽  
Modelling Technique ◽  
Design Equation ◽  
Element Modelling ◽  
Bevel Gears ◽  
Gear Manufacturing

Strength of bevel gears can be increased substantially if a web support is provided the back of their teeth. This web can be obtained by either cutting gears through a special gear manufacturing operation, or through the technique of gear forging. In this analysis, the strength due to this back web support is investigated. The new gear tooth configuration, which resembles a plate supported at two adjacent edges is analyzed. The variational energy approach and a finite element modelling technique was also used to analyze six bevel gears. The resulting design equation describes the characteristics of deflection of this new bevel gear tooth more closely than the well-known Lewis design equation.

scholarly journals ANALYSIS OF THE PROCESSING SEQUENCE ON AIRFRAME STRUCTURES MACHING DEFORMATION

2020 ◽  
Vol 7 (6) ◽  
pp. 1-10
Author(s):  
Guichu Ding ◽  
Tao Zhang ◽  
Hongwei Li ◽  
Xiaoming Huang
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Prediction Model ◽  
Large Deformation ◽  
Initial Stress ◽  
Frame Structure ◽  
Initial Residual Stress ◽  
Deformation Law ◽  
Type Integral ◽  
Integral Structure

In order to reveal the influence of different processing procedures on the machining deformation of the whole structure of aviation frame type, a prediction model for the deformation of frame type integral structure caused by initial residual stress was established based on finite element. According to the deformation law of frame parts caused by initial stress of blank, the deformation of whole structure parts based on aviation frame is minimized. The influence of processing process on deformation of frame structure is studied. The results show that when removing the frame material, the deformation of the workpiece can be slowed down by first removing the area with large deformation and relatively concentrated material. And symmetrical removal of the frame material can also slow the deformation of the workpiece.

scholarly journals Tooth Fracture Detection in Spiral Bevel Gears System by Harmonic Response Based on Finite Element Method

2017 ◽  
Vol 2017 ◽  
pp. 1-8
Author(s):  
Yuan Chen ◽  
Rupeng Zhu ◽  
Guanghu Jin ◽  
Yeping Xiong
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Bevel Gear ◽  
Spiral Bevel Gear ◽  
Spiral Bevel Gears ◽  
Harmonic Response ◽  
Bevel Gears ◽  
Tooth Fracture ◽  
Spiral Bevel ◽  
Element Method

Spiral bevel gears occupy several advantages such as high contact ratio, strong carrying capacity, and smooth operation, which become one of the most widely used components in high-speed stage of the aeronautical transmission system. Its dynamic characteristics are addressed by many scholars. However, spiral bevel gears, especially tooth fracture occurrence and monitoring, are not to be investigated, according to the limited published issues. Therefore, this paper establishes a three-dimensional model and finite element model of the Gleason spiral bevel gear pair. The model considers the effect of tooth root fracture on the system due to fatigue. Finite element method is used to compute the mesh generation, set the boundary condition, and carry out the dynamic load. The harmonic response spectra of the base under tooth fracture are calculated and the influence of main parameters on monitoring failure is investigated as well. The results show that the change of torque affects insignificantly the determination of whether or not the system has tooth fracture. The intermediate frequency interval (200 Hz–1000 Hz) is the best interval to judge tooth fracture occurrence. The best fault test region is located in the working area where the system is going through meshing. The simulation calculation provides a theoretical reference for spiral bevel gear system test and fault diagnosis.

An Investigation on Manufacturing of the Straight Bevel Gear Using End Mill by CNC Milling Machine

2005 ◽  
Vol 127 (3) ◽  
pp. 503-511 ◽  
Author(s):  
Cihan O¨zel ◽  
Ali I˙nan ◽  
Latif O¨zler
Keyword(s):  
Measurement Data ◽  
Bevel Gear ◽  
Milling Machine ◽  
Cnc Milling ◽  
Bevel Gears ◽  
Straight Bevel Gear ◽  
Cnc Milling Machine ◽  
Machining Center ◽  
Gear Manufacturing ◽  
End Mills

Accurate manufacturing of bevel gears is an important problem for small workshops because the module milling cutters used for manufacturing are not accurate enough for the task. In this study, manufacturing of straight bevel gears is investigated by using end mills in CNC milling with a vertical machining center. By using this method, use of auxiliary apparatus, special cutters (such as the circular cutter, the rack cutter, etc.), and special machine tools are not required. For the study, first the straight bevel gear was modeled by Tredgold’s approach and manufacturing equations of the straight bevel gear were obtained. For the straight bevel gear manufacturing, a macro program was prepared and used. Afterward, the straight bevel gear was manufactured by using this program in a CNC milling machine, the Dyna 2900 machine. The results of the measurement data for a single tooth on the gear manufactured and the theoretical values are presented and discussed.

Double Disc Mower Gear Parametric Modeling and Modal Analysis Based on Pro/E and ANSYS

2013 ◽  
Vol 753-755 ◽  
pp. 1489-1494
Author(s):  
Ning Zhang ◽  
Man Quan Zhao ◽  
Xiao Zhi Zhang ◽  
Yan Hua Shi
Keyword(s):  
Finite Element ◽  
Modal Analysis ◽  
Parametric Modeling ◽  
Bevel Gear ◽  
Dynamic Design ◽  
Finite Element Software ◽  
Straight Bevel Gear ◽  
Tooth Surfaces ◽  
The Relationship ◽  
Ansys Workbench

Following the involute forming principle, establish the accurate tooth surfaces involute equation, use the Pro/E to parametric modeling the straight bevel gear and virtually assemble. Only need simply modify the relevant parameters, on the basis of the relationship between each variable and parameters of module, number of teeth etc, automaticity regenerate straight bevel gear model. In this paper, using the finite element software ANSYS workbench modal analysis of the gear .The research shows that, the frequency of mode from 6375.2HZ to 19215HZ,which is can provide an effective method for the dynamic design of the gear.

Generation and TCA of Straight Bevel Gear Drive with Modified Geometry

2011 ◽  
Vol 86 ◽  
pp. 403-406 ◽  
Author(s):  
Ji Song Jiao ◽  
Xue Mei Cao
Keyword(s):  
Point Contact ◽  
Longitudinal Direction ◽  
Bevel Gear ◽  
Tooth Surface ◽  
Tooth Contact Analysis ◽  
Bevel Gears ◽  
Straight Bevel Gear ◽  
Bearing Contact ◽  
Tooth Surfaces ◽  
Gear Drives

In order to reduce the sensitivity of straight bevel gear drives to misalignment, a new geometry of such gear drives is proposed in longitudinal direction. Point contact instead of line contact of tooth surfaces is achieved by longitudinal crowning of pinion tooth surface. The tooth surface modeling and tooth contact analysis (TCA) of straight bevel gear drives have been established. TCA program of a pair of straight bevel gears was performed in MATLAB and tooth bearing contact and transmission errors were obtained.

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