Lubricant composition for use on workpieces in the hot forming of metals

• US 5,691,282 A
• Filed: 05/16/1996
• Issued: 11/25/1997
• Est. Priority Date: 05/16/1995
• Status: Expired due to Fees

• Current Assignee: Timcal SA (Stichting Administratiekantoor Frère-Bourgeois)
• Original Assignee: Timcal SA (Stichting Administratiekantoor Frère-Bourgeois)
• Inventors: Staub, Hans-Rudolf, Periard, Jacques
• Primary Examiner(s): McAvoy, Ellen M.
• Application Number:
  US08/648,958
• Time in Patent Office: 558 Days
• Field of Search: 508/113, 508/126, 508/125, 508/127
• US Class Current: 508/113
• CPC Class Codes: C10M 103/00 Lubricating compositions characterised by the base-material being an inorganic material containing more than 10% water C10M173/00
• CPC Class Codes: C10M 103/02 Carbon; Graphite
• CPC Class Codes: C10M 103/06 Metal compounds
• CPC Class Codes: C10M 125/24 Compounds containing phosphorus, arsenic or antimony
• CPC Class Codes: C10M 125/26 Compounds containing silicon or boron, e.g. silica, sand
• CPC Class Codes: C10M 145/14 Acrylate; Methacrylate
• CPC Class Codes: C10M 145/40 Polysaccharides, e.g. cellulose
• CPC Class Codes: C10M 169/044 the additives being a mixture of non-macromolecular and macromolecular compounds
• CPC Class Codes: C10M 2201/003 used as base material
• CPC Class Codes: C10M 2201/02 Water
• CPC Class Codes: C10M 2201/0403 used as base material
• CPC Class Codes: C10M 2201/041 Carbon; Graphite; Carbon black
• CPC Class Codes: C10M 2201/0413 used as base material
• CPC Class Codes: C10M 2201/042 halogenated, i.e. graphite fluoride
• CPC Class Codes: C10M 2201/0423 used as base material
• CPC Class Codes: C10M 2201/0433 used as base material
• CPC Class Codes: C10M 2201/0603 used as base material
• CPC Class Codes: C10M 2201/0613 used as base material
• CPC Class Codes: C10M 2201/0623 used as base material
• CPC Class Codes: C10M 2201/0653 used as base material
• CPC Class Codes: C10M 2201/0663 : used as base material
• CPC Class Codes: C10M 2201/0803 : used as base material
• CPC Class Codes: C10M 2201/085 : Phosphorus oxides, acids or salts
• CPC Class Codes: C10M 2201/0853 : used as base material
• CPC Class Codes: C10M 2201/0863 : used as base material
• CPC Class Codes: C10M 2201/087 : Boron oxides, acids or salts
• CPC Class Codes: C10M 2201/0873 : used as base material
• CPC Class Codes: C10M 2201/10 : Compounds containing silicon
• CPC Class Codes: C10M 2201/1006 : used as base material
• CPC Class Codes: C10M 2201/102 : Silicates
• CPC Class Codes: C10M 2201/1023 : used as base material
• CPC Class Codes: C10M 2201/1033 : used as base material
• CPC Class Codes: C10M 2201/105 : Silica
• CPC Class Codes: C10M 2201/1053 : used as base material
• CPC Class Codes: C10M 2201/12 : Glass
• CPC Class Codes: C10M 2201/123 : used as base material
• CPC Class Codes: C10M 2209/084 : Acrylate; Methacrylate
• CPC Class Codes: C10M 2209/12 : Polysaccharides, e.g. cellulose, biopolymers
• CPC Class Codes: C10N 2040/24 : without essential removal of material , e.g. forming, gorging, drawing, pressing, stamping, rolling or extruding; Punching metal
• CPC Class Codes: C10N 2040/241 : Manufacturing joint-less pipes
• CPC Class Codes: C10N 2040/242 : Hot working
• CPC Class Codes: C10N 2040/243 : Cold working
• CPC Class Codes: C10N 2040/244 : of specific metals
• CPC Class Codes: C10N 2040/245 : Soft metals, e.g. aluminum
• CPC Class Codes: C10N 2040/246 : Iron or steel
• CPC Class Codes: C10N 2040/247 : Stainless steel

Abstract

Lubricant composition for use on workpieces in the hot forming of metals, which contains:

(a₁) 0 to 80 percent by weight of a glass powder,

(a₂) 0 to 50 percent by weight of a glass frit whereby the content of at least one component (a₁) or (a₂) in the lubricant composition is not 0 percent by weight,

(b) 10 to 25 percent by weight of natural or synthetic graphite,

(c) 5 to 20 percent by weight of one or more alkali metal silicates of the general formula Me₂ O.n SiO₂, where Me is lithium, potassium or sodium and n is a number between 1 and 4,

(d) 1 to 6 percent by weight of a water-soluble sodium polymetaphosphate,

(e) 0 to 3 percent by weight of a water-insoluble sodium polymetaphosphate,

(f) 0.5 to 4 percent by weight of a thickener, and

(g) 0 to 1 percent by weight of borax.

Claims

1. Lubricant composition for use on workpieces in the hot forming of metals, which comprises:

(a₁) 0 to 80 percent by weight of a glass powder

(a₂) 0 to 50 percent by weight of a glass frit whereby the content of at least one component (a₁) or (a₂) in the lubricant composition is not 0 percent by weight,

(b) 10 to 25 percent by weight of natural or synthetic graphite,

(c) 5 to 20 percent by weight of one or more alkali metal silicates of the general formula Me₂ O.n SiO₂, where Me is lithium, potassium or sodium and n is a number between 1 and 4,

(d) 1 to 6 percent by weight of a water-soluble sodium polymetaphosphate,

(e) 0 to 3 percent by weight of a water-insoluble sodium polymetaphosphate,

(f) 0.5 to 4 percent by weight of a thickener, and

(g) 0 to 1 percent by weight of borax.

2. The lubricant composition according to claim 1, wherein the glass powder used has an average particle diameter d₅₀ of <

100 μ

m and a softening range of about 700°

to 900°

C.

3. The lubricant composition according to claim 2, wherein the glass frit used has an average particle diameter d₅₀ of <

100 μ

m and a softening range of about 500°

to 700°

C.

4. The lubricant composition according to claim 3, wherein water-soluble alkali metal silicates of the general formula Me₂ O.n SiO₂, where Me is lithium, potassium or sodium and n is a number between 1 and 4, are used individually or in an admixture.

5. The lubricant composition according to claim 4, wherein the water-soluble sodium polymetaphosphate used is a Graham salt of the general formula (NaPO₃)_n where n is less than 450.

12. The lubricant composition according to claim 1, wherein the glass frit used has an average particle diameter d₅₀ of <

100 μ

m and a softening range of about 500°

to 700°

C.

13. The lubricant composition according to claim 1, wherein water-soluble alkali metal silicates of the general formula Me₂ O.n SiO₂, where Me is lithium, potassium or sodium and n is a number between 1 and 4, are used individually or in admixture.

14. The lubricant composition according to claim 1, wherein the water-soluble sodium polymetaphosphate used is a Graham salt of the general formula (NaPO₃)_n where n is less than 450.

15. The lubricant composition according to claim 1, wherein the water-soluble sodium polymetaphosphate used is a Maddrell salt of the general formula (NaPO₃)_n where n is from 40 to 70.

16. The lubricant composition according to claim 1, wherein the thickener used is a polysaccharide, a polysaccharide derivative or an alkali metal salt of a polyacrylate.

17. The lubricant composition according to claim 1 which is in the form of an aqueous dispersion.

18. The lubricant composition according to claim 1 which is in the form of an aqueous dispersion having a solids content of from 20 to 50 percent.

19. The lubricant composition according to claim 1 for use with workpieces having surface temperatures above 800°

C., which comprises;

(a₁) 0 to 20 percent by weight of a glass powder,

(a₂) 30 to 50 percent by weight of a glass frit,

(b) 20 to 25 percent by weight of natural or synthetic graphite,

(c) 7 to 20 percent by weight of one or more alkali metal silicates of the general formula Me₂ O.n SiO₂, where Me is lithium, potassium or sodium and n is a number between 1 and 4,

(d) 2 to 6 percent by weight of a water-soluble sodium polymetaphosphate,

(e) 0 to 1 percent by weight of a water-insoluble sodium polymetaphosphate,

(f) 3 to 4 percent by weight of a thickener, and

(g) 0.2 to 0.7 percent by weight of borax.

20. The lubricant composition according to claim 1 for use with workpieces having a surface temperature above 1000°

C., which comprises;

(a₁) 45 to 70 percent by weight of a glass powder,

(a₂) 0 to 20 percent by weight of a glass frit,

(b) 20 to 25 percent by weight of natural or synthetic graphite,

(c) 7 to 20 percent by weight of one or more alkali metal silicates of the general formula Me₂ O.n SiO₂, where Me is lithium, potassium or sodium and n is a number between 1 and 4,

(d) 1 to 2 percent by weight of a water-soluble sodium polymetaphosphate,

(e) 0 to 1 percent by weight of a water-insoluble sodium polymetaphosphate,

(f) 1.5 to 2 percent by weight of a thickener, and

(g) 0 to 0.25 percent by weight of borax.

21. The process of using the lubricant composition according to claim 1 for the direct lubrication of workpieces having a surface temperature of from about 800°

to 1300°

C. in the hot forming of metals.

22. The lubricant composition according to claim 1, wherein the water-insoluble sodium polymetaphosphate is present in an amount of up to, and including, 3 percent by weight, and the borax is present in an amount of up to, and including, 1 percent by weight.

25. The lubricant composition according to claim 19, wherein the water-insoluble sodium polymetaphosphate is present in an amount of up to, and including, 3 percent by weight, and the borax is present in an amount of up to, and including, 1 percent by weight.

26. The lubricant composition according to claim 20, wherein the water-insoluble sodium polymetaphosphate is present in an amount of up to, and including, 3 percent by weight, and the borax is present in an amount of up to, and including, 1 percent by weight.

6. The lubricant composition according to claim 6, wherein the water-soluble sodium polymetaphosphate used is a Maddrell salt of the general formula (NaPO₃)_n where n is from 40 to 70.

7. The lubricant composition according to claim 6, wherein the thickener used is a polysaccharide, a polysaccharide derivative or an alkali metal salt of a polyacrylate.

8. The lubricant composition according to claim 7 which is in the form of an aqueous dispersion.

9. The lubricant composition according to claim 8 which is in the form of an aqueous dispersion having a solids content of from 20 to 50 percent.

10. The lubricant composition according to claim 9 for use with workpieces having surface temperatures above 800°

C., which comprises;

(a₁) 0 to 20 percent by weight of a glass powder,

(a₂) 30 to 50 percent by weight of a glass frit,

(b) 20 to 25 percent by weight of natural or synthetic graphite,

(c) 7 to 20 percent by weight of one or more alkali metal silicates of the general formula Me₂ O.n SiO₂, where Me is lithium, potassium or sodium and n is a number between 1 and 4,

(d) 2 to 6 percent by weight of a water-soluble sodium polymetaphosphate,

(e) 0 to 1 percent by weight of a water-insoluble sodium polymetaphosphate,

(f) 3 to 4 percent by weight of a thickener, and

(g) 0.2 to 0.7 percent by weight of borax.

11. The lubricant composition according to claim 9 for use with workpieces having a surface temperature above 1000°

C., which comprises;

(a₁) 45 to 70 percent by weight of a glass powder,

(a₂) 0 to 20 percent by weight of a glass frit,

(b) 20 to 25 percent by weight of natural or synthetic graphite,

(c) 7 to 20 percent by weight of one or more alkali metal silicates of the general formula Me₂ O.n SiO₂, where Me is lithium, potassium or sodium and n is a number between 1 and 4,

(d) 1 to 2 percent by weight of a water-soluble sodium polymetaphosphate,

(e) 0 to 1 percent by weight of a water-insoluble sodium polymetaphosphate,

(f) 1.5 to 2 percent by weight of a thickener, and

(g) 0 to 0.25 percent by weight of borax.

23. The lubricant composition according to claim 10, wherein the water-insoluble sodium polymetaphosphate is present in an amount of up to, and including, 3 percent by weight, and the borax is present in an amount of up to, and including, 1 percent by weight.

24. The lubricant composition according to claim 11, wherein the water-insoluble sodium polymetaphosphate is present in an amount of up to, and including, 3 percent by weight, and the borax is present in an amount of up to, and including, 1 percent by weight.