Cold forming of steel with lubricating oils

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Lubrication Engineering

OSTI ID:245342

Komatsuzaki, S; Uematsu, T ^[1]; Narahara, T ^[2]

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1. Hitachi Research Laboratory, Hitchi-shi (Japan)
2. Hitachi Chemical Co., Ltd., Tokyo (Japan)

In forward extrusions, the antiseizure property could be improved fairly simply when condensed phosphoric acids were directly added to lubricating oils together with monoalkyl phosphates or dialkyl phosphites. The condensed phosphoric acids had poor forming load-lowering properties despite their high antiseizure property, while the phosphates and phosphites had good forming load-lowering properties. When used in combination, both properties supplemented each other and the antiseizure property was enhanced (Maximum workable die temperature: over 312{degrees}C at a reduction rate of cross-sectional area of 75 percent). However, seizure occured more readily in backward extrusion, since a larger active nascent surface was formed, and a sufficient amount of oil could not be supplied to the nascent surface. Powdery ureas or amide compounds helped the formation of micropools (oil pockets) and played an effective role in preventing seizure between the workpiece and the tool. Such powders acted as a good oil trapping agent and indirectly improved the effectiveness of lubricating oils. Their particles could remain at the deformed surface in the form of micropools to improve lubrication at a high piercing ration (ratio of piercing distance and punch diameter). 4 refs., 14 fig., 7 tab.

• OSTI ID: 245342
• Journal Information: Lubrication Engineering, Journal Name: Lubrication Engineering Journal Issue: 3 Vol. 52; ISSN LUENAG; ISSN 0024-7154
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
36 MATERIALS SCIENCE
COLD WORKING
EXTRUSION
LUBRICATING OILS
LUBRICATION
PERFORMANCE
PHOSPHATES
POWDERS
STEELS