Analytical procedure for the optimization of plastic gear tooth root

Landi, Luca; Stecconi, Alessandro; Morettini, Giulia; Cianetti, Filippo

doi:10.1016/j.mechmachtheory.2021.104496

Cited by 16 publications

(4 citation statements)

References 20 publications

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“…When the machine torsion angle (θ) was higher than θ limit , cracks and other defects were more likely to occur on the surface of the torsion sample. As the L value was constant, a smaller θ was needed for a larger addendum circle diameter (d a ) and reference circle diameter (d) of the end face in Equation (2). Therefore, the parameters D and d a should be adjusted carefully and a larger D was more favorable to increase θ limit .…”

Section: Resultsmentioning

confidence: 99%

“…Thus, small modulus gears are now widely used in aircraft, communication facilities, traffic vehicles, intelligent instruments, appliances, etc. In particular, plastic gears are getting more and more attention in recent years due to their light weight, low noise, and inherent lubricity [1,2]. For plastic gear manufacturing, injection molding is the main method and the mold cavity is crucial for the gear injection molding process [3].…”

Section: Introductionmentioning

confidence: 99%

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An Efficient Method to Fabricate the Mold Cavity for a Helical Cylindrical Pinion

Zhu

Zhou

et al. 2023

Processes

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An efficient method was proposed to fabricate the mold cavity for a helical cylindrical pinion based on a plastic torsion forming concept. The structure of the spur gear cavity with the same profile as the end face of the target helical gear cavity was first fabricated by low-speed wire electrical discharge machining (LS-WEDM). Then, the structure of the helical gear cavity could be obtained by twisting the spur gear cavity plastically around the central axis. In this way, the fabrication process of a helical cylindrical gear cavity could be greatly simplified, compared to the fabrication of a multi-stage helical gear core electrode and the highly difficult and complex spiral EDM process in the current gear manufacturing method. Moreover, several experiments were conducted to verify this novel processing concept, and a theoretical model was established to show the relationship between the machine torsion angle and the helical angle of a helical gear. Based on this theoretical model, the experimental results showed that it is feasible to precisely control the shape accuracy of a helical cylindrical pinion mold cavity by adjusting the machine torsion angle.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

An Efficient Method to Fabricate the Mold Cavity for a Helical Cylindrical Pinion

Zhu

Zhou

et al. 2023

Processes

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show abstract

“…In the industrial world, there is an increasing tendency to design structural components capable of withstanding significant static and dynamic loads. In various fields, such as aerospace, there have been considerations to replace aluminum in many significant applications [2][3]. This new trend is also due to the knowledge gained from scientific research in the mechanical characterization of these materials and the standardization of processes and technological controls that are gradually defining standard parameters for successful mechanical performance of finished components, both statically and dynamically [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Assessment of different forecasting strategies for the breaking load resistance in notched specimens 3d-printed in PLA using additive manufacturing (FFF) technology

Morettini,

Palmieri,

Cianetti

et al. 2024

IOP Conf. Ser.: Mater. Sci. Eng.

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The introduction of fused deposition modelling in the industrial sector to produce functional components in thermoplastic materials, such as PLA, requires knowledge of the performance limits of such elements during the design phase. Predicting the breaking load resistance of notched specimens is essential to evaluate the mechanical performance of components manufactured using this technology. This study compares different methodologies based on the critical distance criterion (TCD) for predicting the static breaking strength of printed notched specimens made with Fused Filament Fabrication (FFF) technology using PLA material. Specimens with different topologies of V-notches were printed according to a standardized configuration. Various analysis techniques were applied to determine the breaking strength of each specimen. By comparing the results obtained with experimental data to assess their accuracy and reliability, it has been demonstrated that these methodologies, coupled with the concept of equivalent elastic material (EMC), can be useful for predicting static breaking load.

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“…They reported that a more petite root transition fillet gives rise to a larger tooth deformation, a higher temperature, and root stress concentration. Landi et al (2021) proposed an optimum design of polymer gear roots. Their results showed that compared to the standardized ISO 53-2 C rack profile, root bending stress of circular and elliptical profiles decreases by 10-15%, respectively.…”

Section: Introductionmentioning

confidence: 99%

A comparative study of fatigue behavior between S-shaped and involute POM gears

Wei

Liu

et al. 2022

Journal of Computational Design and Engineering

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Applications of polymer gears have been gradually expanding from motion transmission to power transmission fields. Design of new gear teeth profiles plays a crucial role in meeting the requirement of replacing metallic gears with polymer ones. This work develops a computational framework consisting of tooth profile generation and fatigue life prediction of S-shaped and involute POM gears. The contact and bending fatigue performances of S-shaped and involute POM gears under oil lubrication are comparatively studied. It is found that the S-shaped profile reduces the tooth root stress by 25% and significantly improves the bending fatigue life by order of magnitude compared with the involute profile, especially under medium or high loading levels. Furthermore, the S-shaped gear with a single circular-filleted root curve benefits a 20% reduction of tooth root stress and a 30% increase in bending fatigue life compared to a double circular-filleted root curve S-shaped gear.

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Analytical procedure for the optimization of plastic gear tooth root

Cited by 16 publications

References 20 publications

An Efficient Method to Fabricate the Mold Cavity for a Helical Cylindrical Pinion

An Efficient Method to Fabricate the Mold Cavity for a Helical Cylindrical Pinion

Assessment of different forecasting strategies for the breaking load resistance in notched specimens 3d-printed in PLA using additive manufacturing (FFF) technology

A comparative study of fatigue behavior between S-shaped and involute POM gears

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