High performance cold
forging oil has been developed to realize excellent
galling prevention property equivalent to the soap/phosphate
coating and low corrosiveness against ferrous materials.
The effect of extreme pressure additives on galling
prevention was investigated by the ball penetration
method. Sample oils containing oleyl acid phosphate
(OLAP) and phosphoric acid are found to exhibit
excellent galling prevention corresponding to the
soap/phosphate coating. It is discovered that adding
zinc phosphate to the oil suppresses the corrosiveness
of the oil without reducing the galling prevention
ability. The target of the development has been
satisfactorily accomplished with the composition
including OLAP, phosphoric acid and zinc phosphate.
The developed oil showed superior performance in
practical cold forging test. Replacing the soap/phosphate
lubricant with the newly developed oil has brought
enormous benefits on cost and productivity on production
lines.
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