Influence of manufacturing parameters on gear distortion

Kohlhoff, Tim; Prinz, C.; Rentsch, R.; Surm, H.

doi:10.1002/mawe.201100893

Cited by 16 publications

(10 citation statements)

References 5 publications

(10 reference statements)

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“…Manufacturing steps are performed in industrial conditions in a Renault (French car manufacturer) plant. It has been observed that teeth distortion is a consequence of size and shape changes of the base-body [1]. As a consequence, by improving the understanding of shaft distortion and decreasing it, teeth distortion should be limited.…”

Section: Objectivementioning

confidence: 99%

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Consideration of residual stress and geometry during heat treatment to decrease shaft bending

Husson

Baudouin

Bigot

et al. 2014

Int J Adv Manuf Technol

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To cite this version:Rémi Husson, Cyrille Baudouin, Régis Bigot, Edoardo Sura. Consideration of residual stress and geometry during heat treatment to decrease shaft bending. International Journal Advanced Manufacturing Technology, 2014, 72 (9-12) As a consequence, geometrical nonconformities roots can be determined more easily thanks to this diagnosis tool, and corrective actions can be applied. Secondly, the influence of product geometry on bending is experimentally considered. Moreover, metallurgical observations enable to explain the influence of workpieces geometry on shaft bending. Thanks to the obtained results, process and product recommendations to decrease shafts bending are proposed.

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Section: Objectivementioning

confidence: 99%

“…Nevertheless, heat treatment has side effects such as geometrical variations on global and local scales [1]. Industrially, it means that these defects sometimes lead to increase scrap rates.…”

Section: Introductionmentioning

confidence: 99%

Consideration of residual stress and geometry during heat treatment to decrease shaft bending

Husson

Baudouin

Bigot

et al. 2014

Int J Adv Manuf Technol

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“…Steinbacher and Kohlhoff present corresponding results and their interpretation, obtained for different experimental designs and carried out within the SFB 570 [12,13].…”

Section: Evaluation Examplementioning

confidence: 90%

Areal parameters for the characterisation of gear distortions

Stöbener

Freyberg

Fuhrmann

et al. 2012

Materialwissenschaft Werkst

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Gear distortion is influenced by several effects which might originate in various steps of the entire production chain. To understand the distortion mechanisms including interactions between different influencing parameters, a system approach for the whole production process is required. As distortion is not constrained to the toothing but also effects the gear's base body, an extended measuring strategy (compared to the standard) has been devised. Based on this strategy, an areal evaluation has been developed and new quality parameters describing the deviations of the whole gear and of each tooth have been defined. In contrast to the standard evaluation, the new quality parameters consider the relationship between different measured lines. This offers the possibility to determine the influences of the base body deviations on the toothing distortion and to separate them from the intrinsic toothing deviation. This paper describes the developed strategies and methods and compares them with the standard inspection process.Keywords: gear / distortion / areal evaluation / measurement strategy / cmm / Der Verzug von Zylinderrädern wird durch verschiedene Effekte beeinflusst, die in unterschiedlichen Teilen der Fertigungskette auftreten können. Um die Verzugsmechanismen inklusive der Wechselwirkungen zwischen den einzelnen Einflussgrößen vollständig zu verstehen, ist ein Systemansatz für den gesamten Fertigungsprozess erforderlich. Da der Verzug nicht nur auf die Verzahnung beschränkt ist, sondern am gesamten Zylinderradkörper auftreten kann, ist (verglichen mit dem Standard) eine aufwändige Messstrategie für Zylinderräder entworfen worden. Basierend auf dieser Strategie konnte eine flächenhafte Auswertung inklusive neuer Qualitätspara-metern entwickelt werden, welche sowohl die Formabweichungen des gesamten Zylinderrades als auch die der einzelnen Zähne beschreiben. Die Auswertung berücksichtigt im Gegensatz zum Standard-Verfahren die Beziehungen zwischen den einzelnen gemessenen Linien. Damit ergibt sich die Möglichkeit, die Einflüsse der Grundkörperverformungen auf den Verzahnungsverzug zu bestimmen und sie von denen der Verzahnung zu separieren. Der Artikel beschreibt die entwikkelten Strategien und Methoden und vergleicht sie mit dem standardisierten Mess-und Auswerteprozess.

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“…A detailed description of each of the mechanical processing steps can be comprehended in the work of Kohlhoff [2].…”

Section: Gearsmentioning

confidence: 99%

“…For the process chain of cylindrical gear wheels the influences of the hardenability of steel melts, the forging and the different machining processes are attended in the investigations of Kohlhoff [2]. This paper deals with the heat treatment related distortion of gear wheels.…”

Section: Introductionmentioning

confidence: 98%

Methodical investigation of distortion biasing parameters during case hardening of spur wheels

Steinbacher

Surm

Clausen

et al. 2012

Materialwissenschaft Werkst

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Highly stressed gears are typically heat treated to satisfy operational demands. Case hardening is a common heat treatment associated with power train components. In the heat treatment process complex distortion processes take place, which were studied in these examinations. Object of the actual investigations were spur wheels with module 2.557 and 42 teeth on the wheel with a helix angel of 23 8. The case hardening was realized utilizing low pressure carburisation with subsequent high pressure gas quenching in a heat treatment furnace of industrial proportion. The systematic analysis was guided using design of experiment methods. In strategic focus were the three contributing heat treatment steps of heating, carburisation and quenching. Heating related factors were the batch design, the heat transfer and the preheating temperature. During carburisation the temperature, carburisation depth and surface carbon content as well as the atmosphere during diffusion were altered. Finally the quenching related variation was the hardening temperature. The identified main factors on size as well as shape changes of the base body and the toothing will be presented and discussed.Keywords: Case hardening / gear wheels / heat treatment / heating / carburising / quenching / SAE5120 (EN20MnCr5) / Chargenaufbau, der Wärmeübergangsmechanismus sowie die Temperatur der ersten Haltestufe für den Temperaturausgleich in der Charge. Die in der Aufkohlung variierten Größen sind die Aufkohlungstiefe und der Randkohlenstoffgehalt, sowie die Atmosphäre während der Diffusionsund Haltephasen. In Bezug auf die Abschreckung wurde der Einfluss der Härtetemperatur auf den Verzug der Zahnräder betrachtet. Durch eine 3-D-Koordinatenmessung des Grundkörpers und der Verzahnung vor und nach der Wärmebehandlung konnte eine ¾nderung der Maß-und Formabweichungen durch die Wärme-behandlung abgeleitet werden. Diese ¾nderungen wurden hinsichtlich der einzelnen beschriebenen Parameter und deren Variationen mittels der Auswertung des DoE-Plans analysiert, um die signifikanten Einflussgrößen auf den Verzug zu identifizieren. Im Folgenden werden die Ergebnisse der Untersuchungen dargestellt und diskutiert.

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Influence of manufacturing parameters on gear distortion

Cited by 16 publications

References 5 publications

Consideration of residual stress and geometry during heat treatment to decrease shaft bending

Consideration of residual stress and geometry during heat treatment to decrease shaft bending

Areal parameters for the characterisation of gear distortions

Methodical investigation of distortion biasing parameters during case hardening of spur wheels

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