(57) A substantially water-free, liquid lubricant for metal forming, which comprises (a)
a lubricating oil, and (b) at least one phosphoric acid monoester from the group represented
by the general formula:
wherein R is alkyl, alkylalkenyl or aryl, and optionally (c) at least one member of
the group including fatty acids, fatty acid amides and metal soaps, can form a lubricating
film with a good heat resistance and good lubricating properties by virtue of the
heat generated by deformation and friction during the forming only by wetting the
surface of a metallic workpiece (2) or a die (5) with the liquid lubricant, and can
work effectively for prevention of galling. Parts or articles with a higher reduction
of area and complicated shape can be readily formed. Furthermore, a film having a
lubricating effect equivalent to that of the conventional phosphate coating film can
be simply obtained with a great contribution to product cost reduction.
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