Cryogenic machining process using nanofluid

Patent metadata

Field	Value
Publication number	US-2018290254-A1
Application number	US-201715483115-A
Country	US
Kind code	A1
Filing date	Apr 10, 2017
Priority date	Apr 10, 2017
Publication date	Oct 11, 2018
Grant date	—

Abstract

A machining process includes providing a cutting tool having a rake face and a flank face; bringing the cutting tool into contact with a metal alloy work piece to form a chip by penetrating the cutting tool into the workpiece; and introducing a nanofluid into a vicinity of the penetration to remove heat and, in some instances, customize the finished surface. The nanofluid includes a mixture of a cryo-liquid and nanoparticles having a maximum size of approximately 0.1 nanometers to approximately 100 nanometers.

First claim

What is claimed is:

1 . A machining process comprising:
providing a cutting tool having a rake face and a flank face; bringing the cutting tool into contact with a metal alloy work piece to form a chip by penetrating the cutting tool into the workpiece; and introducing a nanofluid into a vicinity of the penetration to remove heat, the nanofluid including a mixture of:
a cryo-liquid, and
nanoparticles having a maximum size of approximately 0.1 nanometers to approximately 100 nanometers.

2 . The machining process as recited in claim 1 , wherein the nanofluid contains, by weight, up to 10% of the nanoparticles.

3 . The machining process as recited in claim 2 , wherein the nanofluid contains, by weight, from approximately 0.1% to approximately 2% of the nanoparticles.

4 . The machining process as recited in claim 1 , wherein the nanoparticles are selected from the group consisting of metal carbides, metal nitrides, hexagonal form of boron nitride, metal borides, and combinations thereof.

5 . The machining process as recited in claim 1 , wherein the nanoparticles are selected from the group consisting of carbon allotropes.

6 . The machining process as recited in claim 1 , wherein the nanoparticles are metals selected from the group consisting of silver, indium, copper, tin, and combinations thereof.

7 . The machining process as recited in claim 1 , wherein the nanoparticles are selected from the group consisting of metal sulfides, metal borates, and combinations thereof.

8 . The machining process as recited in claim 1 , wherein the nanoparticles are selected from the group consisting of metal silicates, metal fluorides, and combinations thereof.

9 . The machining process as recited in claim 1 , wherein the nanofluid includes a surfactant agent coupled to surfaces of the nanoparticles, the surfactant agent is selected from the group consisting of amphiphilic compounds that contain a polar functional group and a heteroatom, and the surfactant agent has an atomic backbone that is from 15 to 30 atoms in length.

10 . The machining process as recited in claim 1 , wherein the nanoparticles are solid in the cryo-liquid and are non-solid at 20° C. and an absolute pressure of 1 atm.

11 . The machining process as recited in claim 1 , including using the nanoparticles of the nanofluid that reacts to form a functional protective coating on at least one of cutting tool or the workpiece.

12 . The machining process as recited in claim 1 , wherein the nanofluid is introduced into the vicinity of the penetration externally of the cutting by directing the nanofluid toward the rake face, the flank face, or both the rake face and the flank face.

13 . The machining process as recited in claim 1 , wherein the nanofluid is introduced into the vicinity of the penetration internally to the cutting by circulating the nanofluid within the cutting tool.

14 . A fluid for aiding in a machining process, comprising:
nanofluid including a mixture of:
a cryo-liquid, and
nanoparticles having a maximum size of approximately 0.1 nanometers to approximately 100 nanometers.

15 . The fluid as recited in claim 14 , wherein the nanofluid contains, by weight, up to 10% of the nanoparticles.

16 . The fluid as recited in claim 15 , wherein the nanofluid contains, by weight, from approximately 0.1% to approximately 2% of the nanoparticles.

17 . The fluid as recited in claim 14 , wherein the nanoparticles are selected from the group consisting of metal carbides, metal nitrides, metal borides, carbon allotropes, metal sulfides, metal borates, metal fluorides, and combinations thereof.

18 . The fluid as recited in claim 14 , wherein the nanoparticles are metals selected from the group consisting of silver, indium, copper, tin, and combinations thereof.

19 . The fluid as recited in claim 14 , wherein the nanofluid includes a surfactant agent coupled to surfaces of the nanoparticles, the surfactant agent is selected from the group consisting of amphiphilic compounds that contain a polar functional group and a heteroatom, and the surfactant agent has an atomic backbone that is from 15 to 30 atoms in length.

20 . The fluid as recited in claim 14 , wherein the nanoparticles are solid in the cryo-liquid and are non-solid at 20° C. and an absolute pressure of 1 atm.

Assignees

• United Technologies Corp

Inventors

• Opalka Susanne M
• El-Wardany Tahany Ibrahim
• Barnat Krzysztof
• Lin Ray-Sing

Classifications

• C10N2040/20

  Metal working · CPC title

• C10N2040/22

  with essential removal of material {, e.g. cutting, grinding or drilling} · CPC title

• C10N2020/06

  Particles of special shape or size · CPC title

• C10M2201/105

  Silica · CPC title

• C10M2201/081

  containing halogen · CPC title