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Tribology in Forming Advanced High Strength Steels (Ahss) : Evaluation of lubricants, tool materials and coatings for reducing galling
Bok av Hyunok Kim
To improve crash worthiness and fuel
economy, the automotive industry is using increasingly
Advanced High Strength Steels (AHSS). Forming AHSS often
causes lubricant film break down and galling that increases
scrap rates and tool maintenance cost. This book introduces
a model developed to predict the severity of galling for
given lubricants, die materials and coatings in forming
galvanized AHSS. Finite Element Analysis (FEA) and various
experiments were conducted to develop a galling prediction
model. The prediction model considered the empirical
relationships between galling and important tribological
parameters (e.g. interface pressure, sliding length,
surface roughness, lubricant viscosity, hardness of
zinc-coatings and tool coatings) in forming galvanized
AHSS. This model was applied to estimate the total number
of parts that can be formed before severe galling occurs.
Therefore, it can offer a cost effective way for automotive
stamping industry to select practical and best combinations
of lubricant, tool material and tool coating for reducing
galling in forming galvanized AHSS.