Lubricant composition for clamping devices
AssigneeDdp Specialty Electronic Materials US9, LLC
InventorsTobias Schlarb, Christian Kranenberg
Life of this patent
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Abstract
A lubricating composition which, when used with a device for clamping an article, such as a chuck, produces excellent lubricating properties whilst remaining strongly adhered to metal parts in a clamping mechanism of the device and showing enhanced chemical and physical resistance to fluids such as cutting fluids.
Claims20
A lubricating grease or paste for application on a surface of a device chosen from a keyed chuck device, keyless chuck device, lathe chuck, collet and fastening device, or a mechanism for attaching grinding discs, saw blades, and apparatuses to a drive spindle, said composition consisting of:
- a) from about 15 to about 50% by weight of one or more solid lubricant powders chosen from calcium carbonate, tricalcium phosphate, hydroxylapatite, zinc sulfide, and combinations thereof
- b) from about 34 to about 53% by weight of one or more mineral oils;
- c) from about 0.5 to about 20% by weight of one or more adhesion improvers chosen from polyisobutylene having a number average molecular weight (Mn) of from 900 to 2500 g/mol, ethylene/propylene copolymers, and combinations thereof;
- d) from about 0.5 to about 3% by weight of one or more waxes chosen from beeswax, synthetic non-functionalized hard paraffinic hydrocarbon wax, and combinations thereof;
- and
- e) from about 3 to about 11% by weight of one or more thickeners chosen from Li-12 hydroxystearate, zinc Stearate, and combinations thereof,
- wherein said lubricating grease or paste exhibits:
- an unworked penetration of from about 248 to about 348 mm/10 as measured in accordance with ISO 2137:
- 2007;
- a 60× worked penetration of from about 270 to about 354 mm/10 as measured in accordance with ISO 2137:
- 2007;
- a density of from about 0.99 to about 1.32 g/ml 10 as measured at 20° C. in accordance with DIN 51757:2011-01;
- a flow pressure of from about 2775 to about 1075 mbar as measured at −20° C. in accordance with DIN 51805-2:2016-09;
- a dropping point of from about 140 to about 232° C. as measured in accordance with Energy Institute IP 396/02, 10 K/min;
- a water resistance of at least zero as measured for 24 hours at 90° C. in accordance with DIN 51807 pt. 1;
- and
- a cutting fluid resistance of at least zero as measured over a 7 day period at room temperature in accordance with DIN 51807 pt. 1;
- and
- wherein the lubricating grease or paste produces a static clamping force drop of from about 0.6 to about 7.1% when applied to a manual lathe chuck.
Dependencies are inferred from the claim text.