| 摘要 |
PROBLEM TO BE SOLVED: To improve production efficiency by preventing occurrence of cissing. SOLUTION: This cissing prevention method is characterized by the use of a press working oil made by decreasing a volume ratio of a mineral oil included in the base oil of the press working oil, and increasing the volume ratio of an oiliness agent in correspondence with the decreased volume ratio of the above mineral oil, in a press forming step. The press working oil preferably comprises, by volume ratio, 20 to 30% or less the base oil, 50% to 65% the oiliness agent, and the balance a lubricant with a rust-preventive agent and an additive or the like. COPYRIGHT: (C)2004,JPO&NCIPI
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