Solid anti-friction devices – materials therefor – lubricant or se – Lubricants or separants for moving solid surfaces and... – Organic -co- compound
Patent
1996-09-16
2000-08-22
Howard, Jacqueline V.
Solid anti-friction devices, materials therefor, lubricant or se
Lubricants or separants for moving solid surfaces and...
Organic -co- compound
508579, 72 42, C10M12926
Patent
active
061072605
DESCRIPTION:
BRIEF SUMMARY
SPECIFICATION
This Application is a 371 of PCT/JP94/02204, Dec. 22, 1994.
Aluminium or aluminium alloy moulding process lubricant, and aluminium or aluminium alloy plate for moulding processes.
FIELD OF TECHNOLOGY
This invention concerns processing technology for aluminium or aluminium alloy plate (below, these are together referred to as Al). More specifically, this invention relates to a lubricant which is effective during the moulding of Al products of complex shape which are difficult to process, with Al components which are difficult to mould, for example automobile components, and also electrical equipment components, and aircraft components.
BACKGROUND TECHNOLOGY
Since Al has superior corrosion resistance and mouldability, as well as lightness, it is widely used in many industrial fields, particularly the automobile industry, as the most universally used metal material, after steel materials. Recently, in order to make automobiles lighter, the use of Al plate has gradually been increasing. However, Al plate is more difficult to mould than steel plate, and easily cracks during moulding; hence there are major problems, such as shape lmitations during design.
Because of this, when pressing Al plate, automobile manufacturers often use liquid lubricating oils or solid lubricants with superior lubricating properties rather than using the normal mineral oil lubricants. The solid lubricants are used to increase press mouldabuity by forming a lubricant film on the Al plate material beforehand. Thus, in the subsequent assembly steps, bonding processes and welding processes are performed on the pressed products without removing the lubricant, and the lubricant is removed in a degreasing step after completion of the assembly steps.
However, with the aforesaid method, because the bonding processes and welding processes are performed with the lubricant still coated on the product after pressing, the residual lubricant causes poor bonding and poor welding, and as a result productivity may decrease and product quality may deteriorate.
DISCLOSURE OF INVENTION
This invention is made in the light of circumstances such as the aforesaid. The purpose of this invention is to provide lubricants for Al plate moulding, which solve the defects of the previous technology, and also to provide Al plate for moulding processes. Thus, it provides Al plate moulding lubricants such that degreasing is not difficult when degreasing is performed after the moulding and assembly processes have been finished, and the same bonding strength, weld strength and spot electrode life are obtained as when no lubricant is adhering to the press-moulded product in the bonding process and welding process after the pressing process, and it provides Al plate for such moulding processes.
In order to achieve the aforesaid purpose, the present inventors carried out repeated research into Al plate moulding methods, and thus, as a result of searching for moulding process lubricant compositions that do not worsen the bondability and weldability of the Al plate, made this invention.
In one aspect, this invention provides an Al moulding process lubricant characterised in that it is an aqueous solution comprising a polyalkylene oxide or derivative thereof, a higher fatty acid salt and water, among these the polyalkylene oxide or derivative thereof comprises 2 to 50 weight %, and is contained in an amount 4 to 12 times the weight of the higher fatty acid salt, and it forms a solid lubricant film on evaporation of the water after coating onto the Al surface.
In another aspect, this invention provides an Al plate for moulding processes, characterised in that a lubricant containing 4-12 weight parts polyalkylene oxide or derivative thereof per weight part higher fatty acid salt is formed onto the surface of the Al plate as a 0.2-2.0 g/m.sup.2 solid film.
The "moulding" referred to above does not only mean moulding by pressing alone, and it includes moulding by drawing or deep-drawing processes, stamping, and extrusion.
This invention is described in detail
REFERENCES:
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patent: 3277001 (1966-10-01), Fischer
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patent: 4027512 (1977-06-01), Treat
patent: 4664823 (1987-05-01), Kuwamoto et al.
patent: 4752405 (1988-06-01), Kyle et al.
patent: 5171903 (1992-12-01), Koyama et al.
Matsui Kuniaki
Sugita Tomoyuki
Watada Hideya
Castrol Kabushiki Kaisha
Howard Jacqueline V.
Shinkou Alcoa Yusoukizai Kabushiki Kaisha
Toomer Cephia D.
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