An investigation into the forging of Bi-metal gears

Politis, Denis J.; Lin, Jianguo; Dean, Trevor; Balint, Daniel S.

doi:10.1016/j.jmatprotec.2014.04.020

Cited by 44 publications

(27 citation statements)

References 10 publications

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“…The key challenge in joining by forming is the creation of the metallurgical bond between raw parts. Politics et al studied the material flow behavior of different material combinations (steel-aluminum, steel-lead, steel-copper and copper-lead) depending on tooth ring thickness as well as friction properties in the interface zone and in the contact area between forging tool and workpiece [26,27]. Wu et al carried out similar research for a steel-aluminum-combination focusing on gap size and height difference between ring and core [28].…”

Section: Discussionmentioning

confidence: 99%

Microstructural Evolution and Mechanical Properties of Hybrid Bevel Gears Manufactured by Tailored Forming

Behrens

Chugreeva

Diefenbach

et al. 2020

Metals

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The production of multi-metal bulk components requires suitable manufacturing technologies. On the example of hybrid bevel gears featuring two different steels at the outer surface and on the inside, the applicability of the novel manufacturing technology of Tailored Forming was investigated. In a first processing step, a semi-finished compound was manufactured by cladding a substrate using a plasma transferred arc welding or a laser hotwire process. The resulting semi-finished workpieces with a metallurgical bond were subsequently near-net shape forged to bevel gears. Using the residual heat after the forging process, a process-integrated heat treatment was carried out directly after forming. For the investigations, the material combinations of 41Cr4 with C22.8 (AISI 5140/AISI 1022M) and X45CrSi9-3 with C22.8 (AISI HNV3/AISI 1022M) were applied. To reveal the influence of the single processing steps on the resulting interface, metallographic examinations, hardness measurements and micro tensile tests were carried out after cladding, forging and process-integrated heat treatment. Due to forging and heat-treatment, recrystallization and grain refinement at the interface and an increase in both, hardness and tensile strength, were observed.

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Section: Discussionmentioning

confidence: 99%

Microstructural Evolution and Mechanical Properties of Hybrid Bevel Gears Manufactured by Tailored Forming

Behrens

Chugreeva

Diefenbach

et al. 2020

Metals

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“…This alteration is feasible for components which subject to low stress and deformation. However, for highly stressed components such as gears, this change could be partially (Politis et al, 2014). Stresses occur locally in spur gears; bending, shear, and compressive stress in root regions and Hertz stress in contact region.…”

Section: Introductionmentioning

confidence: 99%

Çift Metalli Dişlilerin Sonlu Elemanlar Gerilme ve Modal Analizi

Yılmaz¹,

Karpat²

2019

Uludağ University Journal of the Faculty of Engineering

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Involute spur gears subject to damage on their fillet and contact areas because of local stresses. There is no significant stress except these regions. Based on this fact, different materials could be used for high stress and low stress regions provided that suitable fusion method is available. This kind of design change results in weight reduction, and it ensures to reduce CO 2 emissions for vehicles. In this study, natural frequencies and root stress of bimetal spur gears were analyzed. Results were compared with full steel spur gear. The steel was used for high stress region. Aluminum and magnesium alloys were used as low stress zone.

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“…[10] considered different tool design in warm gear forging, investigating how it influences metal flow and load requirements. Similar tool was used for Bi-metal gears forging [11].…”

Section: Introductionmentioning

confidence: 99%

Cold Radial Extrusion of a Gear-Like Element with Flow Relief Opening

et al. 2018

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When divided material flow is enabled during extrusion process, the required forming load is lower compared to a conventional process. The reduction of forming load leads to higher quality of extruded part and longer tool life. One way to achieve divided material flow is the application of a relief opening, either in the billet or in the tool. In this paper, theoretical solution based upon the Upper bound theorem was used to determine the forming load for radial extrusion of a gear-like element with straight parallel flank profile. Two possible positions of relief openings were analysed -in the centre of the billet and in the centre of the punch. Theoretical solution was compared to experimental results. Material of billets was Al 99,5. Comparison between theoretical and experimental values of the forming load showed fairly good agreement. Further development of the proposed theoretical solution should lead to better process description and more accurate value of the forming load.

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An investigation into the forging of Bi-metal gears

Cited by 44 publications

References 10 publications

Microstructural Evolution and Mechanical Properties of Hybrid Bevel Gears Manufactured by Tailored Forming

Microstructural Evolution and Mechanical Properties of Hybrid Bevel Gears Manufactured by Tailored Forming

Çift Metalli Dişlilerin Sonlu Elemanlar Gerilme ve Modal Analizi

Cold Radial Extrusion of a Gear-Like Element with Flow Relief Opening

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