Studying the Effective Parameters on Teeth Height in Internal Gear Flowforming Process

Khodadadi, Majid; Khalili, Khalil; Ashrafi, Amir

doi:10.5829/ije.2020.33.12c.18

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…wherein: e R s f   1 , and by substituting equations from Equation (23) to Equation (26) into Equation (17), the profile equation of the driving eccentric circular gear is expressed as follows:…”

Section: 1 the Profile Equation Of The Driving Gearmentioning

confidence: 99%

“…A setback in these works is the difference in shape and dimension of the teeth located around NCGs since these are gears with asymmetrical tooth profiles. The NCGs is different from standard cylindrical gears with the constant gear ratio [24][25][26]. The tooth thickness changes along with centrodes in the generation by a standard rack-cutter, and at places where the radius of the centrodes is small, the tooth are often undercutting.…”

Section: Introductionmentioning

confidence: 99%

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A Novel Curve for the Generation of the Non-circular Gear Tooth Profile

2022

IJE

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This paper presents a novel curve generated by a point attached to an ellipse as it rolls without slipping along a datum line of rack cutter. A mathematical model of the non-circular gear profile has been developed based on the theory of gearing. The effect of an axial ratio  (the ratio of the lengths of the major and minor axes of the ellipse) and the position of the point KR, at which the novel curve starts to generate on the tooth shape and the undercut of the non-circular gear pair is also taken into consideration. A numerical program developed from the mathematical model has been proposed for the calculation and design of the non-circular gears (NCGs). Case studies are presented to show the steps of tooth shape design and to examine the geometrical profile of the NCGs in relation to design parameters of the rack cutter etc. From that, the axial ration  and position of the point KR on the generating ellipse ƩE can be selected for each specific case in order to design the appropriate profiles of the NCGs. On that basis, an experiment to determine the gear ratio of the NCGs pair based on the meshing between gears has manufactured.

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Section: 1 the Profile Equation Of The Driving Gearmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Novel Curve for the Generation of the Non-circular Gear Tooth Profile

2022

IJE

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Investigation of Hardness, Microstructure, and Process Temperature in the Internal Gear Flow-Forming Process

et al. 2023

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Single- and multi-objective optimization of internal gear flowforming process based on increasing tooth height and reducing force and built-up edge

Khodadadi

Khalili

Ashrafi

2023

Trans. Can. Soc. Mech. Eng.

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Flowforming is an incremental metal forming process in which deformation occurs gradually between the roller and mandrel. This process has been widely used for manufacturing of high-precision tubular parts and seamless tubes. Internal gear flowforming process is a new method for manufacturing an internal gear that requires no additional machining process. In this study, the design of experiment method and regression analysis were used to obtain tooth height, force, and built-up edge as functions of the effective parameters, including feed rate, roller diameter, attack angle, and thickness reduction percentage. Next, the simulated annealing and genetic algorithm were used for, respectively, single- and multi-objective optimization of the obtained functions. The goal of optimization was to reduce the force and built-up edge and increase the tooth height. In single-objective optimization, the maximum tooth height was 0.576 mm, the minimum force was 1606.63 N, and the minimum built-up edge was 0.448 mm. In multi-objective optimization, an optimal set of tooth height, force, and built-up edge (Pareto front) is obtained.

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Studying the Effective Parameters on Teeth Height in Internal Gear Flowforming Process

Cited by 3 publications

References 6 publications

A Novel Curve for the Generation of the Non-circular Gear Tooth Profile

A Novel Curve for the Generation of the Non-circular Gear Tooth Profile

Investigation of Hardness, Microstructure, and Process Temperature in the Internal Gear Flow-Forming Process

Single- and multi-objective optimization of internal gear flowforming process based on increasing tooth height and reducing force and built-up edge

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