Electric discharge machine process and fluid
AssigneeTexaco Inc.
InventorsTheodore C. Mead, Douglas H. Culpon, Jr.
Life of this patent
Estimating the term…
Abstract
An electric discharge machine fluid has been discovered. The fluid comprises a naphthene oil and 0.15 to 0.50 wt % 1,6-hexamethylene bis(3,5-ditertiarybutyl-4-hydroxycinnamate). The fluid was found to increase the breakdown voltage of the fluid and to stabilize oxidative deterioration.
Claims14
An electric discharge machining process in which a workpiece is machined by an electric discharge generated between said workpiece and an electrode, and a dielectric fluid is applied to both of said workpiece and said electrode, characterized by:
- said dielectric fluid comprising a major portion of a mineral oil and a minor portion of a phenolic compound of the formula:
- R--(CH.sub.2).sub.y COO( CH.sub.2).sub.x COO(CH.sub.2).sub.y --R
- wherein:
- R is a ditertiarybutyl-4-hydroxylphenyl radical,
- x ranges from 4 to 12, and
- y ranges from 1 to
- wherein the phenolic compound comprises 0.5% or more by weight of the dielectric fluid.
The electric discharge machining process in which a workpiece is machined by an electric discharge generated between said workpiece and an electrode, and a dielectric fluid is applied to both of said workpiece and said electrode, characterized by:
- said dielectric fluid comprising a major portion of a naphthene mineral oil and 0.5 wt % to 1.0 wt %
- 2,6-hexamethylene bis-2,6-ditertiary-butyl-4-hydroxycinnamate.
A dielectric fluid composition comprising a major portion of a naphthene mineral oil having a viscosity of 5 to 15 cSt @40.degree. C. and 0.5 to 1.0 wt % of a phenolic compound of the formula:
- R--(CH.sub.2).sub.y --COO(CH.sub.2).sub.x COO(CH.sub.2).sub.y --R
- wherein:
- R is a ditertiarybutyl-4-hydroxylphenyl radical,
- x ranges from 4 to 12, and
- y ranges from 1 to 3.
Dependencies are inferred from the claim text.