Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Nitrogen and heavy metal – or nitrogen and aluminum – in the...
Patent
1996-11-05
1998-02-10
Howard, Jacqueline V.
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Nitrogen and heavy metal, or nitrogen and aluminum, in the...
508375, 72 42, C10M13706, C10M14106
Patent
active
057169136
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a metal working oil composition, and more particularly to a metal working oil composition characterized by containing a zinc dithiophosphate in an amount more than conventional sensible amounts. The present invention also relates to a novel metal working oil composition wherein use is made of an organomolybdenum extreme-pressure agent instead of a chlorine extreme-pressure agent which has hitherto been used in metal working oil compositions. The present invention also relates to a novel metal working method characterized by using these metal working oil compositions.
BACKGROUND ART
Conventionally used lubricants employed in metal working, such as cutting, grinding, drawing, wire drawing, pressing, etc., are those which comprise a vegetable or animal oil or fat, a mineral oil, or a synthetic oil, or a mixture thereof, as a base oil, and an oily agent, an extreme-pressure agent, a rust preventive, an antioxidant, etc. added thereto. In recent years, metal working conditions, such as increases in size and precision of various working machines, an increase in hardness of metal materials, increases in speed and pressure involved in metal working conditions, and an increase in accuracy of the finished surfaces of metal products, have been made increasingly severe in keeping with the elevation of general technical levels, and the above lubricants have been required to have further higher extreme-pressure properties. To solve this problem, a chlorine extreme-pressure agent has hitherto been added.
However, chlorine extreme-pressure agents are apprehended about their toxicity, particularly their carcinogenicity. Thus, in view of the consideration for environment of late years, non-chlorine extreme-pressure agents have been increasingly considered preferable.
As additives alternative to chlorine extreme-pressure agents, there are zinc dithiophosphates (ZDTP). Examples of metal working oils containing ZDTP added thereto include a press working oil comprising a combination of a borate with ZDTP (see Japanese Patent Application Laid-Open No. 79193/1981), a water-based metal cutting oil comprising a combination of a polyoxyalkylamine with ZDTP (see Japanese Patent Application Laid-Open No. 108098/1984), and cutting oils containing ZDTP added thereto (see Japanese Patent Publication Nos. 12920/1988 and 40567/1986). The added amounts of ZDTP in these conventional ZDTP-containing metal working oils are at most about 20% based on the base oil.
On the other hand, cold forging as one of methods of plastically working metals is characterized in that worked products with a high strength, a high dimensional accuracy, a smooth surface and an approximately net shape can be mass-produced at a high rate. However, the cold forging is a metal working method which is carried out under very severe conditions and therefore various measures have been taken for the metal working oils and metal working techniques.
As a contrived example of its representative metal working technique, a phosphate coating treatment can be mentioned. The phosphate coating treatment is a technique on which the present progress of the cold forging is based. The phosphate coating treatment is a pretreatment wherein the surface of a metal to be processed is treated with a phosphate, such as zinc phosphate, to form a film of a metal phosphate on the metal surface.
However, the phosphate coating treatment is a pretreatment peculiar to cold forging and it has been said that in comparison with other metal working methods, the phosphate coating treatment is a drawback of cold forging in that the process becomes complicated. Accordingly, for the purpose of dispensing with the phosphate coating treatment, metal working oils have hitherto been developed. Metal working oils containing a zinc dithiophosphate (ZDTP) added thereto can be considered representatives thereof.
With respect particularly to oils for plastic working that utilizes plastic deformation of metals, probably because the demanded lubricity is exceptionall
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Fukushima Aritoshi
Inaba Haruyo
Sugioka Michiyoshi
Yamamoto Yasuyoshi
Asahi Denka Kogyo Kabushiki Kaisha
Howard Jacqueline V.
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