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Hardening distortions related to segregations in crown wheels
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Mechanical Metallurgy. Scania CV, Södertälje, Sweden.ORCID iD: 0000-0002-0288-0238
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Mechanical Metallurgy. Scania CV, Södertälje, Sweden.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Mechanical Metallurgy. Scania CV, Södertälje, Sweden.
2016 (English)In: HTM - Journal of Heat Treatment and Materials, ISSN 1867-2493, Vol. 71, no 2, 68-74 p.Article in journal (Refereed) Published
Resource type
Text
Abstract [en]

The back-face tilt of press-hardened crown wheels is investigated for continuous and ingot cast material. Two different geometries are studied, one with a flat back-face and one with a step. For two ingots, the original material position is tracked and coupled to back-face tilt, cross section hardness and chemical segregation. The chemical gradients are shifted from top to bottom of the ingot and are strongly coupled to the back-face tilt.

Place, publisher, year, edition, pages
Carl Hanser Verlag GmbH, 2016. Vol. 71, no 2, 68-74 p.
Keyword [en]
Crown Wheels, Hardening Distortions, Ingot Casting, Macrosegregation, Press Hardening
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-187095DOI: 10.3139/105.110282ISI: 000376180400002Scopus ID: 2-s2.0-84964292204OAI: oai:DiVA.org:kth-187095DiVA: diva2:928926
Note

QC 20160517

Available from: 2016-05-17 Created: 2016-05-17 Last updated: 2017-05-16Bibliographically approved
In thesis
1. Hardening Distortions of Serial Produced Gears
Open this publication in new window or tab >>Hardening Distortions of Serial Produced Gears
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Hardening distortions are unwanted changes in shape and dimension that arise during hardening of steel components. Uncontrolled distortions induce random errors to the manufacturing process, and have a strong negative impact on manufacturing costs. The distortions are not only caused by the hardening process, several factors from previous manufacturing steps including the component geometry itself contribute to varying extent. The aim of the current work is to investigate the main influencing factors on hardening distortions for serial produced gears.

The investigations were done on two different types of gears for heavy-duty transmissions, crown wheels for the rear axle central gear and main shaft gears for the gearbox. The steel was produced using either continuous casting or ingot casting. For rectangular continuously cast steel, the effect of disabling magnetic stirring of the steel melt during casting was investigated, finding a strong reduction of gear runout for crown wheels. Segregations in crown wheels produced from the top and bottom of ingots were shown to go in opposite directions, producing opposite back-face tilts.

For crown wheels quenched one at a time, influences of stacking level on the hardening tray were found, indicating an impact from small variations in the carburizing process, despite identical quenching conditions. For main shaft gears, horizontal loading gave considerably less roundness and runout errors but increased flatness errors compared to vertical loading.

This thesis shows the complexity of the distortion phenomenon and how several factors interact and contribute to the final result. It is shown that factors with significant impact on hardening distortions for one component may be less important for another component. With this in mind, each type of component to be hardened should be produced by a manufacturing chain where each process step is carefully chosen with respect to minimizing distortions.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 33 p.
Keyword
hardening distortions, crown wheel, main shaft gear, gear runout, back-face tilt, macrosegregation, ingot casting, continuous casting, case hardening
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
Identifiers
urn:nbn:se:kth:diva-207087 (URN)978-91-7729-449-8 (ISBN)
Presentation
2017-06-12, Hörsalen byggnad 260, Scania, Södertälje, 14:30 (Swedish)
Opponent
Supervisors
Note

QC 20170516

Available from: 2017-05-16 Created: 2017-05-16 Last updated: 2017-05-19Bibliographically approved

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