Recently, Vibration Damping Steel Sheet (VDSS) has been increasingly used for automobile parts such as dash boards and partition panels. VDSS is also used in oil pans, but the requirements in this application are much stricter than those in other auto applications. The material must remain sound (show no wall break) and not delaminate during deep drawing press forming. In service, it must be oil tight at the welded drain nut and must maintain good adhesion characteristics at high temperatures of 60 - 120 Cel. The VDSS with a thermoplastic resin core used to date in oil pans provides poor baking durability and heat durability in high temperature services. For use in oil pans, the authors therefore developed a new VDSS material comprising two extra deep drawing class steel skin sheets (of ultra low carbon steel) and a thermosetting polyester resin core layer containing metal powder. The shear adhesion strength (SAS) of the thermoplastic resin VDSS was less than half the initial SAS after post-coating baking at 160 - 200 deg C because the melting point of the resin was lower than the baking temperature. However, the SAS of the new thermosetting resin VDSS does not decrease from the initial SAS. It is generally thought that higher SAS values give better deep drawing press formability in VDSS, but the limit formability of VDSS decreased at SAS values higher than 17 MPa, because higher SAS values create a higher press forming load. The optimum SAS of VDSS is 8.4 - 14.5 MPa for both types of resin.
Development of vibration damping steel sheets for automobile oil pans
Entwicklung eines schwingungsdämpfenden Stahlbleches für Ölwannen in Kraftfahrzeugen
SAE Technical Papers ; 1-10
1993
10 Seiten, 26 Bilder, 6 Tabellen, 11 Quellen
Conference paper
English
Development of Vibration Damping Steel Sheets for Automobile Oil Pans
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