Experimental Analysis on Behaviour of Adhesive Scale in Hot Die Forging to Improve Surface Quality of Automobile Parts

Deep dent defects on the automobile parts produced by hot die forging have become problems because the dents were disadvantageous to the strength of these parts. The dents may have been probably caused by scales of hot billets. The behaviour of these thick scales in hot die forging was experimentall...

Full description

Saved in:
Bibliographic Details
Published inTribology Online Vol. 9; no. 3; pp. 80 - 85
Main Authors Kitamura, Kazuhiko, Asai, Kazuhito, Terano, Motoki
Format Journal Article
LanguageEnglish
Published Japanese Society of Tribologists 2014
Subjects
adhesion
Automotive components
Billets
Defects
Die forging
Electron probes
forging
plastic deformation
Preforms
Tribology
Workpieces
Online AccessGet full text

Cover

More Information
Summary:Deep dent defects on the automobile parts produced by hot die forging have become problems because the dents were disadvantageous to the strength of these parts. The dents may have been probably caused by scales of hot billets. The behaviour of these thick scales in hot die forging was experimentally analyzed in this paper. The dents gradually grew bigger and changed the shapes every forging shot before the scales periodically transferred to the workpiece. The deep dent defects frequently formed at the part of the workpiece with large plastic deformation. Additionally, it was found the scales consisted of the oxide/non-oxide layers derived from the hot billet materials by microscope observation and electron probe micro analysis. It was estimated that the thicker scales were formed by layered pick-up and adhesion under severe tribological conditions. Adjusting preform shape and controlling lubrication were proposed to decrease the defects.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1881-2198
1881-2198
DOI:10.2474/trol.9.80