Novel variable-tooth-thickness hob for longitudinal crowning in the gear-hobbing process

Hsu, Ruei‐Hung; Fong, Zhang‐Hua

doi:10.1016/j.mechmachtheory.2011.03.007

Cited by 23 publications

(17 citation statements)

References 5 publications

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“…The generation coordinate systems of the VPA hob cutter are shown in Fig. 1(b), where the coordinate systems 7 S , 3 S , and 4 S are rigidly connected to the rack cutter, hob cutter, and frame, respectively. According to Fig.…”

Section: Mathematical Model Of the Vpa Hob Cuttermentioning

confidence: 99%

“…In the same time, a method for varying the hob profile angle along its lead and shifting the hob diagonally over the whole tooth face width during gear hobbing to reduce the twist of work gear tooth flanks was patented by Winkel [6]. Recently, Hsu and Fong [7] patented the design of a variable tooth thickness (VTT) hob cutter in it's axis and the method of hobbing with a diagonal feed and without varying the center distance. More recently, Tran et al [8] proposed a novel methodology for finish-hobbing of the twist-free longitudinal crowning tooth flank of helical gears by using a new the hob's diagonal feed motion and a dual-lead hob cutter.…”

Section: Introductionmentioning

confidence: 99%

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A Tooth Flank Crowning Method by Applying a Novel Crossed Angle Function Between the Hob Cutter and Work Gear in the Gear Hobbing Process

Tran

Hsu

2016

MATEC Web of Conferences

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Abstract. In this paper, a novel longitudinal tooth flank crowning method is proposed by setting the crossed angle between the hob cutter and work gear as a linear function of hob's traverse feed movement in the gear hobbing process. However, this method makes twisted tooth flanks on the hobbed work gear. Therefore, a variable pressure angle hob cutter is applied to obtain an anti-twist tooth flank of hobbed work gear. A computer simulation example is performed to verify the superiority of the proposed novel hobbing method by comparing topographies of the crowned work gear surfaces hobbed by a standard hob cutter and a variable pressure angle hob cutter.

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Section: Mathematical Model Of the Vpa Hob Cuttermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Tooth Flank Crowning Method by Applying a Novel Crossed Angle Function Between the Hob Cutter and Work Gear in the Gear Hobbing Process

Tran

Hsu

2016

MATEC Web of Conferences

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“…1)-During machining, the tool is moved (shifted) relative to the gear wheel being machined. Gear wheel hobs are ranked among the tools of the most complex geometry [3,4,5,6] and are used for cutting spur gears and helical gears within a whole range of modules, from 0.25 to 25 mm [7,8]. Machining is conducted on specialised hobbing machine tools.…”

Section: Introductionmentioning

confidence: 99%

Geometrical Analysis of Composite Hobs

Piotrowski

Gołębski

Boral

2020

TFAMENA

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The paper presents the universal mathematical model-based geometric analysis of a composite hob with replaceable sintered carbide cutting inserts. Composite hobs are characterised by lower accuracy compared to monolithic hobs and are generally used in roughing. Based on a computational algorithm developed by the authors of this study a computer program has been created to model the position and the geometry of the cutting insert placed on the rake face. A generalised case of a composite hob with a flat rake face not parallel to the hob axis and with rake angles different from zero has been analysed. Methods for correcting the cutting insert position and geometry to improve the composite hob accuracy are presented.

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“…With the development of manufacturing and structural optimization technologies, geometric error has been effectively controlled. Hsu and Fong 3 proposed a mathematical model for a variable tooth thickness (VTT) hob and a corresponding hobbing process. With the help of the proposed model, the work gear tooth flank twist in longitudinal crowning can be reduced by modifying the hob tooth thickness and hob diagonal feed without varying the centre distance.…”

Section: Introductionmentioning

confidence: 99%

A method for thermal characteristics modelling of hob assembly on dry hobbing machine

Liu

Tang

et al. 2018

Proceedings of the Institution of Mechanical Engineers, Part C:

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Gear hobbing is the use of machinery to manufacture external gears. With the booming motor industry, there are more requirements for gear hobbing accuracy than ever before. Thermal error – as a major source of error in a dry hobbing machine – must be effectively compensated to achieve accuracy. Thus, studies on the thermal error of hob assembly are important both in theory and practice. This paper discusses the development of a valid numerical modelling method for the hob assembly of a dry hobbing machine. The equations used to determine the values of heat sources and heat transfer coefficients are given. The temperature field and thermal deformation of the hob assembly were obtained by thermal-structural coupling numerical simulations. Numerical results showed that the deformation can maximally reach to 94.5 µm, which is non-ignorable in the thermal deformation analysis of the whole dry gear hobbing machine. Subsequently, by comparing the simulation results and experimental data, the newly proposed method to determine the forced convection heat transfer coefficient proved more fitting for describing the airflow pattern inside the gear hobbing zone. The satisfactory agreement between simulation results and experimental data also suggests that the numerical analysis method proposed in this paper can provide an effective research tool to optimize the design of hob assembly. And the results obtained by the proposed method can be used for thermal error modelling in real error compensation.

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Novel variable-tooth-thickness hob for longitudinal crowning in the gear-hobbing process

Cited by 23 publications

References 5 publications

A Tooth Flank Crowning Method by Applying a Novel Crossed Angle Function Between the Hob Cutter and Work Gear in the Gear Hobbing Process

A Tooth Flank Crowning Method by Applying a Novel Crossed Angle Function Between the Hob Cutter and Work Gear in the Gear Hobbing Process

Geometrical Analysis of Composite Hobs

A method for thermal characteristics modelling of hob assembly on dry hobbing machine

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