Features 01
Expected Problems
Do you have problems as follows?
?Want to use UHSS sheets in press-formed parts, but delayed fracture is a concern.
?There is a high risk of delayed fracture at sheared edge, but we don't know how to evaluate it.
?Can't predict the lead time for new part development when delayed fracture is considered.
Features 02
Technology highlight
?Establishment of a delayed fracture evaluation method conforming to the actual automobile manufacturing process by conducting hydrochloric acid (HCl) immersion tests in a condition that simulates the strain and stress introduced at sheared edges in the blanking, press-forming, assembly, and painting processes (Fig. 1).
?Acquisition of the delayed fracture limit curve (Fig. 2) through the procedure above, and establishment of a method for prediction of delayed fracture by comparison with CAE analysis results (Fig. 3).
Features 03
Proposed Solutions (Examples)
Judgment of delayed fracture at sheared edge of press-formed parts applying ultra high strength steel.
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