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US 2002/0137637 A1Published application
High performance lubricant for metal punching and shearing
AssigneeCleveland Punch and Die Co
InventorRudy Wojtecki
Life of this patent
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AssigneeCleveland Punch and Die Co
InventorRudy Wojtecki
Estimating the term…
A high performance lubricant to extend the life of tooling to punch holes and shear metals especially thick steel members. The lubricant, due to its modified viscosity, remains on the tool during the process allowing it to provide the necessary coating to reduce the friction developed. Most punching processes mount the tool vertical and the work is held below the tool. Lubricant is applied to the tool prior to punching. A problem with lubricants presently used is the viscosity is so low the lubricant runs off the tool prior to the punching process rendering the lubricant ineffective. The thixotropic index of the lubricant is controlled by addition of fumed silica to provide the proper viscosity to keep the lubricant on the tool and then during the punching process the viscosity is reduced sufficiently by the shear energy applied between the tool and work to allow the lubricant to flow in the shear area thereby providing maximum lubrication between the tool and the work.
An improved cutting lubricant which can be applied to a tool, especially a punch, which has thixotropic properties optimized to produce a desired clingage and lubricity, Said cutting lubricant is composed of a blend of chlorinated paraffin and naphthionic oil with a specific gravity between 1.2-1.3 modified with an optimum loading of 3% by weight fumed silica to increase the viscosity of the lubricant to 32,000 cP with a thixotropic index over 2, Said lubricant having a viscosity which will provide clingage necessary to prevent the lubricant from running off the tool to which it is applied during the punching process, Said lubricant being thixotropic to allow the fluid to freely flow in the cutting area during the punching process and possessing the lubricity necessary to reduce the friction during said cutting process.
Dependencies are inferred from the claim text.